pyparsing-2.1.10/0000777000000000000000000000000012775575715011766 5ustar 00000000000000pyparsing-2.1.10/CHANGES0000666000000000000000000027556312775575636013005 0ustar 00000000000000========== Change Log ========== Version 2.1.10 - October, 2016 ------------------------------- - Fixed bug in reporting named parse results for ZeroOrMore expressions, thanks Ethan Nash for reporting this! - Fixed behavior of LineStart to be much more predictable. LineStart can now be used to detect if the next parse position is col 1, factoring in potential leading whitespace (which would cause LineStart to fail). Also fixed a bug in col, which is used in LineStart, where '\n's were erroneously considered to be column 1. - Added support for multiline test strings in runTests. - Fixed bug in ParseResults.dump when keys were not strings. Also changed display of string values to show them in quotes, to help distinguish parsed numeric strings from parsed integers that have been converted to Python ints. Version 2.1.9 - September, 2016 ------------------------------- - Added class CloseMatch, a variation on Literal which matches "close" matches, that is, strings with at most 'n' mismatching characters. - Fixed bug in Keyword.setDefaultKeywordChars(), reported by Kobayashi Shinji - nice catch, thanks! - Minor API change in pyparsing_common. Renamed some of the common expressions to PEP8 format (to be consistent with the other pyparsing_common expressions): . signedInteger -> signed_integer . sciReal -> sci_real Also, in trying to stem the API bloat of pyparsing, I've copied some of the global expressions and helper parse actions into pyparsing_common, with the originals to be deprecated and removed in a future release: . commaSeparatedList -> pyparsing_common.comma_separated_list . upcaseTokens -> pyparsing_common.upcaseTokens . downcaseTokens -> pyparsing_common.downcaseTokens (I don't expect any other expressions, like the comment expressions, quotedString, or the Word-helping strings like alphas, nums, etc. to migrate to pyparsing_common - they are just too pervasive. As for the PEP8 vs camelCase naming, all the expressions are PEP8, while the parse actions in pyparsing_common are still camelCase. It's a small step - when pyparsing 3.0 comes around, everything will change to PEP8 snake case.) - Fixed Python3 compatibility bug when using dict keys() and values() in ParseResults.getName(). - After some prodding, I've reworked the unitTests.py file for pyparsing over the past few releases. It uses some variations on unittest to handle my testing style. The test now: . auto-discovers its test classes (while maintining their order of definition) . suppresses voluminous 'print' output for tests that pass Version 2.1.8 - August, 2016 ---------------------------- - Fixed issue in the optimization to _trim_arity, when the full stacktrace is retrieved to determine if a TypeError is raised in pyparsing or in the caller's parse action. Code was traversing the full stacktrace, and potentially encountering UnicodeDecodeError. - Fixed bug in ParserElement.inlineLiteralsUsing, causing infinite loop with Suppress. - Fixed bug in Each, when merging named results from multiple expressions in a ZeroOrMore or OneOrMore. Also fixed bug when ZeroOrMore expressions were erroneously treated as required expressions in an Each expression. - Added a few more inline doc examples. - Improved use of runTests in several example scripts. Version 2.1.7 - August, 2016 ---------------------------- - Fixed regression reported by Andrea Censi (surfaced in PyContracts tests) when using ParseSyntaxExceptions (raised when using operator '-') with packrat parsing. - Minor fix to oneOf, to accept all iterables, not just space-delimited strings and lists. (If you have a list or set of strings, it is not necessary to concat them using ' '.join to pass them to oneOf, oneOf will accept the list or set or generator directly.) Version 2.1.6 - August, 2016 ---------------------------- - *Major packrat upgrade*, inspired by patch provided by Tal Einat - many, many, thanks to Tal for working on this! Tal's tests show faster parsing performance (2X in some tests), *and* memory reduction from 3GB down to ~100MB! Requires no changes to existing code using packratting. (Uses OrderedDict, available in Python 2.7 and later. For Python 2.6 users, will attempt to import from ordereddict backport. If not present, will implement pure-Python Fifo dict.) - Minor API change - to better distinguish between the flexible numeric types defined in pyparsing_common, I've changed "numeric" (which parsed numbers of different types and returned int for ints, float for floats, etc.) and "number" (which parsed numbers of int or float type, and returned all floats) to "number" and "fnumber" respectively. I hope the "f" prefix of "fnumber" will be a better indicator of its internal conversion of parsed values to floats, while the generic "number" is similar to the flexible number syntax in other languages. Also fixed a bug in pyparsing_common.numeric (now renamed to pyparsing_common.number), integers were parsed and returned as floats instead of being retained as ints. - Fixed bug in upcaseTokens and downcaseTokens introduced in 2.1.5, when the parse action was used in conjunction with results names. Reported by Steven Arcangeli from the dql project, thanks for your patience, Steven! - Major change to docs! After seeing some comments on reddit about general issue with docs of Python modules, and thinking that I'm a little overdue in doing some doc tuneup on pyparsing, I decided to following the suggestions of the redditor and add more inline examples to the pyparsing reference documentation. I hope this addition will clarify some of the more common questions people have, especially when first starting with pyparsing/Python. - Deprecated ParseResults.asXML. I've never been too happy with this method, and it usually forces some unnatural code in the parsers in order to get decent tag names. The amount of guesswork that asXML has to do to try to match names with values should have been a red flag from day one. If you are using asXML, you will need to implement your own ParseResults->XML serialization. Or consider migrating to a more current format such as JSON (which is very easy to do: results_as_json = json.dumps(parse_result.asDict()) Hopefully, when I remove this code in a future version, I'll also be able to simplify some of the craziness in ParseResults, which IIRC was only there to try to make asXML work. - Updated traceParseAction parse action decorator to show the repr of the input and output tokens, instead of the str format, since str has been simplified to just show the token list content. (The change to ParseResults.__str__ occurred in pyparsing 2.0.4, but it seems that didn't make it into the release notes - sorry! Too many users, especially beginners, were confused by the "([token_list], {names_dict})" str format for ParseResults, thinking they were getting a tuple containing a list and a dict. The full form can be seen if using repr().) For tracing tokens in and out of parse actions, the more complete repr form provides important information when debugging parse actions. Verison 2.1.5 - June, 2016 ------------------------------ - Added ParserElement.split() generator method, similar to re.split(). Includes optional arguments maxsplit (to limit the number of splits), and includeSeparators (to include the separating matched text in the returned output, default=False). - Added a new parse action construction helper tokenMap, which will apply a function and optional arguments to each element in a ParseResults. So this parse action: def lowercase_all(tokens): return [str(t).lower() for t in tokens] OneOrMore(Word(alphas)).setParseAction(lowercase_all) can now be written: OneOrMore(Word(alphas)).setParseAction(tokenMap(str.lower)) Also simplifies writing conversion parse actions like: integer = Word(nums).setParseAction(lambda t: int(t[0])) to just: integer = Word(nums).setParseAction(tokenMap(int)) If additional arguments are necessary, they can be included in the call to tokenMap, as in: hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16)) - Added more expressions to pyparsing_common: . IPv4 and IPv6 addresses (including long, short, and mixed forms of IPv6) . MAC address . ISO8601 date and date time strings (with named fields for year, month, etc.) . UUID (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) . hex integer (returned as int) . fraction (integer '/' integer, returned as float) . mixed integer (integer '-' fraction, or just fraction, returned as float) . stripHTMLTags (parse action to remove tags from HTML source) . parse action helpers convertToDate and convertToDatetime to do custom parse time conversions of parsed ISO8601 strings - runTests now returns a two-tuple: success if all tests succeed, and an output list of each test and its output lines. - Added failureTests argument (default=False) to runTests, so that tests can be run that are expected failures, and runTests' success value will return True only if all tests *fail* as expected. Also, parseAll now defaults to True. - New example numerics.py, shows samples of parsing integer and real numbers using locale-dependent formats: 4.294.967.295,000 4 294 967 295,000 4,294,967,295.000 Version 2.1.4 - May, 2016 ------------------------------ - Split out the '==' behavior in ParserElement, now implemented as the ParserElement.matches() method. Using '==' for string test purposes will be removed in a future release. - Expanded capabilities of runTests(). Will now accept embedded comments (default is Python style, leading '#' character, but customizable). Comments will be emitted along with the tests and test output. Useful during test development, to create a test string consisting only of test case description comments separated by blank lines, and then fill in the test cases. Will also highlight ParseFatalExceptions with "(FATAL)". - Added a 'pyparsing_common' class containing common/helpful little expressions such as integer, float, identifier, etc. I used this class as a sort of embedded namespace, to contain these helpers without further adding to pyparsing's namespace bloat. - Minor enhancement to traceParseAction decorator, to retain the parse action's name for the trace output. - Added optional 'fatal' keyword arg to addCondition, to indicate that a condition failure should halt parsing immediately. Version 2.1.3 - May, 2016 ------------------------------ - _trim_arity fix in 2.1.2 was very version-dependent on Py 3.5.0. Now works for Python 2.x, 3.3, 3.4, 3.5.0, and 3.5.1 (and hopefully beyond). Version 2.1.2 - May, 2016 ------------------------------ - Fixed bug in _trim_arity when pyparsing code is included in a PyInstaller, reported by maluwa. - Fixed catastrophic regex backtracking in implementation of the quoted string expressions (dblQuotedString, sglQuotedString, and quotedString). Reported on the pyparsing wiki by webpentest, good catch! (Also tuned up some other expressions susceptible to the same backtracking problem, such as cStyleComment, cppStyleComment, etc.) Version 2.1.1 - March, 2016 --------------------------- - Added support for assigning to ParseResults using slices. - Fixed bug in ParseResults.toDict(), in which dict values were always converted to dicts, even if they were just unkeyed lists of tokens. Reported on SO by Gerald Thibault, thanks Gerald! - Fixed bug in SkipTo when using failOn, reported by robyschek, thanks! - Fixed bug in Each introduced in 2.1.0, reported by AND patch and unit test submitted by robyschek, well done! - Removed use of functools.partial in replaceWith, as this creates an ambiguous signature for the generated parse action, which fails in PyPy. Reported by Evan Hubinger, thanks Evan! - Added default behavior to QuotedString to convert embedded '\t', '\n', etc. characters to their whitespace counterparts. Found during Q&A exchange on SO with Maxim. Version 2.1.0 - February, 2016 ------------------------------ - Modified the internal _trim_arity method to distinguish between TypeError's raised while trying to determine parse action arity and those raised within the parse action itself. This will clear up those confusing "() takes exactly 1 argument (0 given)" error messages when there is an actual TypeError in the body of the parse action. Thanks to all who have raised this issue in the past, and most recently to Michael Cohen, who sent in a proposed patch, and got me to finally tackle this problem. - Added compatibility for pickle protocols 2-4 when pickling ParseResults. In Python 2.x, protocol 0 was the default, and protocol 2 did not work. In Python 3.x, protocol 3 is the default, so explicitly naming protocol 0 or 1 was required to pickle ParseResults. With this release, all protocols 0-4 are supported. Thanks for reporting this on StackOverflow, Arne Wolframm, and for providing a nice simple test case! - Added optional 'stopOn' argument to ZeroOrMore and OneOrMore, to simplify breaking on stop tokens that would match the repetition expression. It is a common problem to fail to look ahead when matching repetitive tokens if the sentinel at the end also matches the repetition expression, as when parsing "BEGIN aaa bbb ccc END" with: "BEGIN" + OneOrMore(Word(alphas)) + "END" Since "END" matches the repetition expression "Word(alphas)", it will never get parsed as the terminating sentinel. Up until now, this has to be resolved by the user inserting their own negative lookahead: "BEGIN" + OneOrMore(~Literal("END") + Word(alphas)) + "END" Using stopOn, they can more easily write: "BEGIN" + OneOrMore(Word(alphas), stopOn="END") + "END" The stopOn argument can be a literal string or a pyparsing expression. Inspired by a question by Lamakaha on StackOverflow (and many previous questions with the same negative-lookahead resolution). - Added expression names for many internal and builtin expressions, to reduce name and error message overhead during parsing. - Converted helper lambdas to functions to refactor and add docstring support. - Fixed ParseResults.asDict() to correctly convert nested ParseResults values to dicts. - Cleaned up some examples, fixed typo in fourFn.py identified by aristotle2600 on reddit. - Removed keepOriginalText helper method, which was deprecated ages ago. Superceded by originalTextFor. - Same for the Upcase class, which was long ago deprecated and replaced with the upcaseTokens method. Version 2.0.7 - December, 2015 ------------------------------ - Simplified string representation of Forward class, to avoid memory and performance errors while building ParseException messages. Thanks, Will McGugan, Andrea Censi, and Martijn Vermaat for the bug reports and test code. - Cleaned up additional issues from enhancing the error messages for Or and MatchFirst, handling Unicode values in expressions. Fixes Unicode encoding issues in Python 2, thanks to Evan Hubinger for the bug report. - Fixed implementation of dir() for ParseResults - was leaving out all the defined methods and just adding the custom results names. - Fixed bug in ignore() that was introduced in pyparsing 1.5.3, that would not accept a string literal as the ignore expression. - Added new example parseTabularData.py to illustrate parsing of data formatted in columns, with detection of empty cells. - Updated a number of examples to more current Python and pyparsing forms. Version 2.0.6 - November, 2015 ------------------------------ - Fixed a bug in Each when multiple Optional elements are present. Thanks for reporting this, whereswalden on SO. - Fixed another bug in Each, when Optional elements have results names or parse actions, reported by Max Rothman - thank you, Max! - Added optional parseAll argument to runTests, whether tests should require the entire input string to be parsed or not (similar to parseAll argument to parseString). Plus a little neaten-up of the output on Python 2 (no stray ()'s). - Modified exception messages from MatchFirst and Or expressions. These were formerly misleading as they would only give the first or longest exception mismatch error message. Now the error message includes all the alternatives that were possible matches. Originally proposed by a pyparsing user, but I've lost the email thread - finally figured out a fairly clean way to do this. - Fixed a bug in Or, when a parse action on an alternative raises an exception, other potentially matching alternatives were not always tried. Reported by TheVeryOmni on the pyparsing wiki, thanks! - Fixed a bug to dump() introduced in 2.0.4, where list values were shown in duplicate. Version 2.0.5 - October, 2015 ----------------------------- - (&$(@#&$(@!!!! Some "print" statements snuck into pyparsing v2.0.4, breaking Python 3 compatibility! Fixed. Reported by jenshn, thanks! Version 2.0.4 - October, 2015 ----------------------------- - Added ParserElement.addCondition, to simplify adding parse actions that act primarily as filters. If the given condition evaluates False, pyparsing will raise a ParseException. The condition should be a method with the same method signature as a parse action, but should return a boolean. Suggested by Victor Porton, nice idea Victor, thanks! - Slight mod to srange to accept unicode literals for the input string, such as "[а-яА-Я]" instead of "[\u0430-\u044f\u0410-\u042f]". Thanks to Alexandr Suchkov for the patch! - Enhanced implementation of replaceWith. - Fixed enhanced ParseResults.dump() method when the results consists only of an unnamed array of sub-structure results. Reported by Robin Siebler, thanks for your patience and persistence, Robin! - Fixed bug in fourFn.py example code, where pi and e were defined using CaselessLiteral instead of CaselessKeyword. This was not a problem until adding a new function 'exp', and the leading 'e' of 'exp' was accidentally parsed as the mathematical constant 'e'. Nice catch, Tom Grydeland - thanks! - Adopt new-fangled Python features, like decorators and ternary expressions, per suggestions from Williamzjc - thanks William! (Oh yeah, I'm not supporting Python 2.3 with this code any more...) Plus, some additional code fixes/cleanup - thanks again! - Added ParserElement.runTests, a little test bench for quickly running an expression against a list of sample input strings. Basically, I got tired of writing the same test code over and over, and finally added it as a test point method on ParserElement. - Added withClass helper method, a simplified version of withAttribute for the common but annoying case when defining a filter on a div's class - made difficult because 'class' is a Python reserved word. Version 2.0.3 - October, 2014 ----------------------------- - Fixed escaping behavior in QuotedString. Formerly, only quotation marks (or characters designated as quotation marks in the QuotedString constructor) would be escaped. Now all escaped characters will be escaped, and the escaping backslashes will be removed. - Fixed regression in ParseResults.pop() - pop() was pretty much broken after I added *improvements* in 2.0.2. Reported by Iain Shelvington, thanks Iain! - Fixed bug in And class when initializing using a generator. - Enhanced ParseResults.dump() method to list out nested ParseResults that are unnamed arrays of sub-structures. - Fixed UnboundLocalError under Python 3.4 in oneOf method, reported on Sourceforge by aldanor, thanks! - Fixed bug in ParseResults __init__ method, when returning non-ParseResults types from parse actions that implement __eq__. Raised during discussion on the pyparsing wiki with cyrfer. Version 2.0.2 - April, 2014 --------------------------- - Extended "expr(name)" shortcut (same as "expr.setResultsName(name)") to accept "expr()" as a shortcut for "expr.copy()". - Added "locatedExpr(expr)" helper, to decorate any returned tokens with their location within the input string. Adds the results names locn_start and locn_end to the output parse results. - Added "pprint()" method to ParseResults, to simplify troubleshooting and prettified output. Now instead of importing the pprint module and then writing "pprint.pprint(result)", you can just write "result.pprint()". This method also accepts addtional positional and keyword arguments (such as indent, width, etc.), which get passed through directly to the pprint method (see http://docs.python.org/2/library/pprint.html#pprint.pprint). - Removed deprecation warnings when using '<<' for Forward expression assignment. '<<=' is still preferred, but '<<' will be retained for cases whre '<<=' operator is not suitable (such as in defining lambda expressions). - Expanded argument compatibility for classes and functions that take list arguments, to now accept generators as well. - Extended list-like behavior of ParseResults, adding support for append and extend. NOTE: if you have existing applications using these names as results names, you will have to access them using dict-style syntax: res["append"] and res["extend"] - ParseResults emulates the change in list vs. iterator semantics for methods like keys(), values(), and items(). Under Python 2.x, these methods will return lists, under Python 3.x, these methods will return iterators. - ParseResults now has a method haskeys() which returns True or False depending on whether any results names have been defined. This simplifies testing for the existence of results names under Python 3.x, which returns keys() as an iterator, not a list. - ParseResults now supports both list and dict semantics for pop(). If passed no argument or an integer argument, it will use list semantics and pop tokens from the list of parsed tokens. If passed a non-integer argument (most likely a string), it will use dict semantics and pop the corresponding value from any defined results names. A second default return value argument is supported, just as in dict.pop(). - Fixed bug in markInputline, thanks for reporting this, Matt Grant! - Cleaned up my unit test environment, now runs with Python 2.6 and 3.3. Version 2.0.1 - July, 2013 -------------------------- - Removed use of "nonlocal" that prevented using this version of pyparsing with Python 2.6 and 2.7. This will make it easier to install for packages that depend on pyparsing, under Python versions 2.6 and later. Those using older versions of Python will have to manually install pyparsing 1.5.7. - Fixed implementation of <<= operator to return self; reported by Luc J. Bourhis, with patch fix by Mathias Mamsch - thanks, Luc and Mathias! Version 2.0.0 - November, 2012 ------------------------------ - Rather than release another combined Python 2.x/3.x release I've decided to start a new major version that is only compatible with Python 3.x (and consequently Python 2.7 as well due to backporting of key features). This version will be the main development path from now on, with little follow-on development on the 1.5.x path. - Operator '<<' is now deprecated, in favor of operator '<<=' for attaching parsing expressions to Forward() expressions. This is being done to address precedence of operations problems with '<<'. Operator '<<' will be removed in a future version of pyparsing. Version 1.5.7 - November, 2012 ----------------------------- - NOTE: This is the last release of pyparsing that will try to maintain compatibility with Python versions < 2.6. The next release of pyparsing will be version 2.0.0, using new Python syntax that will not be compatible for Python version 2.5 or older. - An awesome new example is included in this release, submitted by Luca DellOlio, for parsing ANTLR grammar definitions, nice work Luca! - Fixed implementation of ParseResults.__str__ to use Pythonic ''.join() instead of repeated string concatenation. This purportedly has been a performance issue under PyPy. - Fixed bug in ParseResults.__dir__ under Python 3, reported by Thomas Kluyver, thank you Thomas! - Added ParserElement.inlineLiteralsUsing static method, to override pyparsing's default behavior of converting string literals to Literal instances, to use other classes (such as Suppress or CaselessLiteral). - Added new operator '<<=', which will eventually replace '<<' for storing the contents of a Forward(). '<<=' does not have the same operator precedence problems that '<<' does. - 'operatorPrecedence' is being renamed 'infixNotation' as a better description of what this helper function creates. 'operatorPrecedence' is deprecated, and will be dropped entirely in a future release. - Added optional arguments lpar and rpar to operatorPrecedence, so that expressions that use it can override the default suppression of the grouping characters. - Added support for using single argument builtin functions as parse actions. Now you can write 'expr.setParseAction(len)' and get back the length of the list of matched tokens. Supported builtins are: sum, len, sorted, reversed, list, tuple, set, any, all, min, and max. A script demonstrating this feature is included in the examples directory. - Improved linking in generated docs, proposed on the pyparsing wiki by techtonik, thanks! - Fixed a bug in the definition of 'alphas', which was based on the string.uppercase and string.lowercase "constants", which in fact *aren't* constant, but vary with locale settings. This could make parsers locale-sensitive in a subtle way. Thanks to Kef Schecter for his diligence in following through on reporting and monitoring this bugfix! - Fixed a bug in the Py3 version of pyparsing, during exception handling with packrat parsing enabled, reported by Catherine Devlin - thanks Catherine! - Fixed typo in ParseBaseException.__dir__, reported anonymously on the SourceForge bug tracker, thank you Pyparsing User With No Name. - Fixed bug in srange when using '\x###' hex character codes. - Addeed optional 'intExpr' argument to countedArray, so that you can define your own expression that will evaluate to an integer, to be used as the count for the following elements. Allows you to define a countedArray with the count given in hex, for example, by defining intExpr as "Word(hexnums).setParseAction(int(t[0],16))". Version 1.5.6 - June, 2011 ---------------------------- - Cleanup of parse action normalizing code, to be more version-tolerant, and robust in the face of future Python versions - much thanks to Raymond Hettinger for this rewrite! - Removal of exception cacheing, addressing a memory leak condition in Python 3. Thanks to Michael Droettboom and the Cape Town PUG for their analysis and work on this problem! - Fixed bug when using packrat parsing, where a previously parsed expression would duplicate subsequent tokens - reported by Frankie Ribery on stackoverflow, thanks! - Added 'ungroup' helper method, to address token grouping done implicitly by And expressions, even if only one expression in the And actually returns any text - also inspired by stackoverflow discussion with Frankie Ribery! - Fixed bug in srange, which accepted escaped hex characters of the form '\0x##', but should be '\x##'. Both forms will be supported for backwards compatibility. - Enhancement to countedArray, accepting an optional expression to be used for matching the leading integer count - proposed by Mathias on the pyparsing mailing list, good idea! - Added the Verilog parser to the provided set of examples, under the MIT license. While this frees up this parser for any use, if you find yourself using it in a commercial purpose, please consider making a charitable donation as described in the parser's header. - Added the excludeChars argument to the Word class, to simplify defining a word composed of all characters in a large range except for one or two. Suggested by JesterEE on the pyparsing wiki. - Added optional overlap parameter to scanString, to return overlapping matches found in the source text. - Updated oneOf internal regular expression generation, with improved parse time performance. - Slight performance improvement in transformString, removing empty strings from the list of string fragments built while scanning the source text, before calling ''.join. Especially useful when using transformString to strip out selected text. - Enhanced form of using the "expr('name')" style of results naming, in lieu of calling setResultsName. If name ends with an '*', then this is equivalent to expr.setResultsName('name',listAllMatches=True). - Fixed up internal list flattener to use iteration instead of recursion, to avoid stack overflow when transforming large files. - Added other new examples: . protobuf parser - parses Google's protobuf language . btpyparse - a BibTex parser contributed by Matthew Brett, with test suite test_bibparse.py (thanks, Matthew!) . groupUsingListAllMatches.py - demo using trailing '*' for results names Version 1.5.5 - August, 2010 ---------------------------- - Typo in Python3 version of pyparsing, "builtin" should be "builtins". (sigh) Version 1.5.4 - August, 2010 ---------------------------- - Fixed __builtins__ and file references in Python 3 code, thanks to Greg Watson, saulspatz, sminos, and Mark Summerfield for reporting their Python 3 experiences. - Added new example, apicheck.py, as a sample of scanning a Tcl-like language for functions with incorrect number of arguments (difficult to track down in Tcl languages). This example uses some interesting methods for capturing exceptions while scanning through source code. - Added new example deltaTime.py, that takes everyday time references like "an hour from now", "2 days ago", "next Sunday at 2pm". Version 1.5.3 - June, 2010 -------------------------- - ======= NOTE: API CHANGE!!!!!!! =============== With this release, and henceforward, the pyparsing module is imported as "pyparsing" on both Python 2.x and Python 3.x versions. - Fixed up setup.py to auto-detect Python version and install the correct version of pyparsing - suggested by Alex Martelli, thanks, Alex! (and my apologies to all those who struggled with those spurious installation errors caused by my earlier fumblings!) - Fixed bug on Python3 when using parseFile, getting bytes instead of a str from the input file. - Fixed subtle bug in originalTextFor, if followed by significant whitespace (like a newline) - discovered by Francis Vidal, thanks! - Fixed very sneaky bug in Each, in which Optional elements were not completely recognized as optional - found by Tal Weiss, thanks for your patience. - Fixed off-by-1 bug in line() method when the first line of the input text was an empty line. Thanks to John Krukoff for submitting a patch! - Fixed bug in transformString if grammar contains Group expressions, thanks to patch submitted by barnabas79, nice work! - Fixed bug in originalTextFor in which trailing comments or otherwised ignored text got slurped in with the matched expression. Thanks to michael_ramirez44 on the pyparsing wiki for reporting this just in time to get into this release! - Added better support for summing ParseResults, see the new example, parseResultsSumExample.py. - Added support for composing a Regex using a compiled RE object; thanks to my new colleague, Mike Thornton! - In version 1.5.2, I changed the way exceptions are raised in order to simplify the stacktraces reported during parsing. An anonymous user posted a bug report on SF that this behavior makes it difficult to debug some complex parsers, or parsers nested within parsers. In this release I've added a class attribute ParserElement.verbose_stacktrace, with a default value of False. If you set this to True, pyparsing will report stacktraces using the pre-1.5.2 behavior. - New examples: . pymicko.py, a MicroC compiler submitted by Zarko Zivanov. (Note: this example is separately licensed under the GPLv3, and requires Python 2.6 or higher.) Thank you, Zarko! . oc.py, a subset C parser, using the BNF from the 1996 Obfuscated C Contest. . stateMachine2.py, a modified version of stateMachine.py submitted by Matt Anderson, that is compatible with Python versions 2.7 and above - thanks so much, Matt! . select_parser.py, a parser for reading SQLite SELECT statements, as specified at http://www.sqlite.org/lang_select.html; this goes into much more detail than the simple SQL parser included in pyparsing's source code . excelExpr.py, a *simplistic* first-cut at a parser for Excel expressions, which I originally posted on comp.lang.python in January, 2010; beware, this parser omits many common Excel cases (addition of numbers represented as strings, references to named ranges) . cpp_enum_parser.py, a nice little parser posted my Mark Tolonen on comp.lang.python in August, 2009 (redistributed here with Mark's permission). Thanks a bunch, Mark! . partial_gene_match.py, a sample I posted to Stackoverflow.com, implementing a special variation on Literal that does "close" matching, up to a given number of allowed mismatches. The application was to find matching gene sequences, with allowance for one or two mismatches. . tagCapture.py, a sample showing how to use a Forward placeholder to enforce matching of text parsed in a previous expression. . matchPreviousDemo.py, simple demo showing how the matchPreviousLiteral helper method is used to match a previously parsed token. Version 1.5.2 - April, 2009 ------------------------------ - Added pyparsing_py3.py module, so that Python 3 users can use pyparsing by changing their pyparsing import statement to: import pyparsing_py3 Thanks for help from Patrick Laban and his friend Geremy Condra on the pyparsing wiki. - Removed __slots__ declaration on ParseBaseException, for compatibility with IronPython 2.0.1. Raised by David Lawler on the pyparsing wiki, thanks David! - Fixed bug in SkipTo/failOn handling - caught by eagle eye cpennington on the pyparsing wiki! - Fixed second bug in SkipTo when using the ignore constructor argument, reported by Catherine Devlin, thanks! - Fixed obscure bug reported by Eike Welk when using a class as a ParseAction with an errant __getitem__ method. - Simplified exception stack traces when reporting parse exceptions back to caller of parseString or parseFile - thanks to a tip from Peter Otten on comp.lang.python. - Changed behavior of scanString to avoid infinitely looping on expressions that match zero-length strings. Prompted by a question posted by ellisonbg on the wiki. - Enhanced classes that take a list of expressions (And, Or, MatchFirst, and Each) to accept generator expressions also. This can be useful when generating lists of alternative expressions, as in this case, where the user wanted to match any repetitions of '+', '*', '#', or '.', but not mixtures of them (that is, match '+++', but not '+-+'): codes = "+*#." format = MatchFirst(Word(c) for c in codes) Based on a problem posed by Denis Spir on the Python tutor list. - Added new example eval_arith.py, which extends the example simpleArith.py to actually evaluate the parsed expressions. Version 1.5.1 - October, 2008 ------------------------------- - Added new helper method originalTextFor, to replace the use of the current keepOriginalText parse action. Now instead of using the parse action, as in: fullName = Word(alphas) + Word(alphas) fullName.setParseAction(keepOriginalText) (in this example, we used keepOriginalText to restore any white space that may have been skipped between the first and last names) You can now write: fullName = originalTextFor(Word(alphas) + Word(alphas)) The implementation of originalTextFor is simpler and faster than keepOriginalText, and does not depend on using the inspect or imp modules. - Added optional parseAll argument to parseFile, to be consistent with parseAll argument to parseString. Posted by pboucher on the pyparsing wiki, thanks! - Added failOn argument to SkipTo, so that grammars can define literal strings or pyparsing expressions which, if found in the skipped text, will cause SkipTo to fail. Useful to prevent SkipTo from reading past terminating expression. Instigated by question posed by Aki Niimura on the pyparsing wiki. - Fixed bug in nestedExpr if multi-character expressions are given for nesting delimiters. Patch provided by new pyparsing user, Hans-Martin Gaudecker - thanks, H-M! - Removed dependency on xml.sax.saxutils.escape, and included internal implementation instead - proposed by Mike Droettboom on the pyparsing mailing list, thanks Mike! Also fixed erroneous mapping in replaceHTMLEntity of " to ', now correctly maps to ". (Also added support for mapping ' to '.) - Fixed typo in ParseResults.insert, found by Alejandro Dubrovsky, good catch! - Added __dir__() methods to ParseBaseException and ParseResults, to support new dir() behavior in Py2.6 and Py3.0. If dir() is called on a ParseResults object, the returned list will include the base set of attribute names, plus any results names that are defined. - Fixed bug in ParseResults.asXML(), in which the first named item within a ParseResults gets reported with an tag instead of with the correct results name. - Fixed bug in '-' error stop, when '-' operator is used inside a Combine expression. - Reverted generator expression to use list comprehension, for better compatibility with old versions of Python. Reported by jester/artixdesign on the SourceForge pyparsing discussion list. - Fixed bug in parseString(parseAll=True), when the input string ends with a comment or whitespace. - Fixed bug in LineStart and LineEnd that did not recognize any special whitespace chars defined using ParserElement.setDefault- WhitespaceChars, found while debugging an issue for Marek Kubica, thanks for the new test case, Marek! - Made Forward class more tolerant of subclassing. Version 1.5.0 - June, 2008 -------------------------- This version of pyparsing includes work on two long-standing FAQ's: support for forcing parsing of the complete input string (without having to explicitly append StringEnd() to the grammar), and a method to improve the mechanism of detecting where syntax errors occur in an input string with various optional and alternative paths. This release also includes a helper method to simplify definition of indentation-based grammars. With these changes (and the past few minor updates), I thought it was finally time to bump the minor rev number on pyparsing - so 1.5.0 is now available! Read on... - AT LAST!!! You can now call parseString and have it raise an exception if the expression does not parse the entire input string. This has been an FAQ for a LONG time. The parseString method now includes an optional parseAll argument (default=False). If parseAll is set to True, then the given parse expression must parse the entire input string. (This is equivalent to adding StringEnd() to the end of the expression.) The default value is False to retain backward compatibility. Inspired by MANY requests over the years, most recently by ecir-hana on the pyparsing wiki! - Added new operator '-' for composing grammar sequences. '-' behaves just like '+' in creating And expressions, but '-' is used to mark grammar structures that should stop parsing immediately and report a syntax error, rather than just backtracking to the last successful parse and trying another alternative. For instance, running the following code: port_definition = Keyword("port") + '=' + Word(nums) entity_definition = Keyword("entity") + "{" + Optional(port_definition) + "}" entity_definition.parseString("entity { port 100 }") pyparsing fails to detect the missing '=' in the port definition. But, since this expression is optional, pyparsing then proceeds to try to match the closing '}' of the entity_definition. Not finding it, pyparsing reports that there was no '}' after the '{' character. Instead, we would like pyparsing to parse the 'port' keyword, and if not followed by an equals sign and an integer, to signal this as a syntax error. This can now be done simply by changing the port_definition to: port_definition = Keyword("port") - '=' + Word(nums) Now after successfully parsing 'port', pyparsing must also find an equals sign and an integer, or it will raise a fatal syntax exception. By judicious insertion of '-' operators, a pyparsing developer can have their grammar report much more informative syntax error messages. Patches and suggestions proposed by several contributors on the pyparsing mailing list and wiki - special thanks to Eike Welk and Thomas/Poldy on the pyparsing wiki! - Added indentedBlock helper method, to encapsulate the parse actions and indentation stack management needed to keep track of indentation levels. Use indentedBlock to define grammars for indentation-based grouping grammars, like Python's. indentedBlock takes up to 3 parameters: - blockStatementExpr - expression defining syntax of statement that is repeated within the indented block - indentStack - list created by caller to manage indentation stack (multiple indentedBlock expressions within a single grammar should share a common indentStack) - indent - boolean indicating whether block must be indented beyond the the current level; set to False for block of left-most statements (default=True) A valid block must contain at least one indented statement. - Fixed bug in nestedExpr in which ignored expressions needed to be set off with whitespace. Reported by Stefaan Himpe, nice catch! - Expanded multiplication of an expression by a tuple, to accept tuple values of None: . expr*(n,None) or expr*(n,) is equivalent to expr*n + ZeroOrMore(expr) (read as "at least n instances of expr") . expr*(None,n) is equivalent to expr*(0,n) (read as "0 to n instances of expr") . expr*(None,None) is equivalent to ZeroOrMore(expr) . expr*(1,None) is equivalent to OneOrMore(expr) Note that expr*(None,n) does not raise an exception if more than n exprs exist in the input stream; that is, expr*(None,n) does not enforce a maximum number of expr occurrences. If this behavior is desired, then write expr*(None,n) + ~expr - Added None as a possible operator for operatorPrecedence. None signifies "no operator", as in multiplying m times x in "y=mx+b". - Fixed bug in Each, reported by Michael Ramirez, in which the order of terms in the Each affected the parsing of the results. Problem was due to premature grouping of the expressions in the overall Each during grammar construction, before the complete Each was defined. Thanks, Michael! - Also fixed bug in Each in which Optional's with default values were not getting the defaults added to the results of the overall Each expression. - Fixed a bug in Optional in which results names were not assigned if a default value was supplied. - Cleaned up Py3K compatibility statements, including exception construction statements, and better equivalence between _ustr and basestring, and __nonzero__ and __bool__. Version 1.4.11 - February, 2008 ------------------------------- - With help from Robert A. Clark, this version of pyparsing is compatible with Python 3.0a3. Thanks for the help, Robert! - Added WordStart and WordEnd positional classes, to support expressions that must occur at the start or end of a word. Proposed by piranha on the pyparsing wiki, good idea! - Added matchOnlyAtCol helper parser action, to simplify parsing log or data files that have optional fields that are column dependent. Inspired by a discussion thread with hubritic on comp.lang.python. - Added withAttribute.ANY_VALUE as a match-all value when using withAttribute. Used to ensure that an attribute is present, without having to match on the actual attribute value. - Added get() method to ParseResults, similar to dict.get(). Suggested by new pyparsing user, Alejandro Dubrovksy, thanks! - Added '==' short-cut to see if a given string matches a pyparsing expression. For instance, you can now write: integer = Word(nums) if "123" == integer: # do something print [ x for x in "123 234 asld".split() if x==integer ] # prints ['123', '234'] - Simplified the use of nestedExpr when using an expression for the opening or closing delimiters. Now the content expression will not have to explicitly negate closing delimiters. Found while working with dfinnie on GHOP Task #277, thanks! - Fixed bug when defining ignorable expressions that are later enclosed in a wrapper expression (such as ZeroOrMore, OneOrMore, etc.) - found while working with Prabhu Gurumurthy, thanks Prahbu! - Fixed bug in withAttribute in which keys were automatically converted to lowercase, making it impossible to match XML attributes with uppercase characters in them. Using with- Attribute requires that you reference attributes in all lowercase if parsing HTML, and in correct case when parsing XML. - Changed '<<' operator on Forward to return None, since this is really used as a pseudo-assignment operator, not as a left-shift operator. By returning None, it is easier to catch faulty statements such as a << b | c, where precedence of operations causes the '|' operation to be performed *after* inserting b into a, so no alternation is actually implemented. The correct form is a << (b | c). With this change, an error will be reported instead of silently clipping the alternative term. (Note: this may break some existing code, but if it does, the code had a silent bug in it anyway.) Proposed by wcbarksdale on the pyparsing wiki, thanks! - Several unit tests were added to pyparsing's regression suite, courtesy of the Google Highly-Open Participation Contest. Thanks to all who administered and took part in this event! Version 1.4.10 - December 9, 2007 --------------------------------- - Fixed bug introduced in v1.4.8, parse actions were called for intermediate operator levels, not just the deepest matching operation level. Again, big thanks to Torsten Marek for helping isolate this problem! Version 1.4.9 - December 8, 2007 -------------------------------- - Added '*' multiplication operator support when creating grammars, accepting either an integer, or a two-integer tuple multiplier, as in: ipAddress = Word(nums) + ('.'+Word(nums))*3 usPhoneNumber = Word(nums) + ('-'+Word(nums))*(1,2) If multiplying by a tuple, the two integer values represent min and max multiples. Suggested by Vincent of eToy.com, great idea, Vincent! - Fixed bug in nestedExpr, original version was overly greedy! Thanks to Michael Ramirez for raising this issue. - Fixed internal bug in ParseResults - when an item was deleted, the key indices were not updated. Thanks to Tim Mitchell for posting a bugfix patch to the SF bug tracking system! - Fixed internal bug in operatorPrecedence - when the results of a right-associative term were sent to a parse action, the wrong tokens were sent. Reported by Torsten Marek, nice job! - Added pop() method to ParseResults. If pop is called with an integer or with no arguments, it will use list semantics and update the ParseResults' list of tokens. If pop is called with a non-integer (a string, for instance), then it will use dict semantics and update the ParseResults' internal dict. Suggested by Donn Ingle, thanks Donn! - Fixed quoted string built-ins to accept '\xHH' hex characters within the string. Version 1.4.8 - October, 2007 ----------------------------- - Added new helper method nestedExpr to easily create expressions that parse lists of data in nested parentheses, braces, brackets, etc. - Added withAttribute parse action helper, to simplify creating filtering parse actions to attach to expressions returned by makeHTMLTags and makeXMLTags. Use withAttribute to qualify a starting tag with one or more required attribute values, to avoid false matches on common tags such as or
. - Added new examples nested.py and withAttribute.py to demonstrate the new features. - Added performance speedup to grammars using operatorPrecedence, instigated by Stefan Reichör - thanks for the feedback, Stefan! - Fixed bug/typo when deleting an element from a ParseResults by using the element's results name. - Fixed whitespace-skipping bug in wrapper classes (such as Group, Suppress, Combine, etc.) and when using setDebug(), reported by new pyparsing user dazzawazza on SourceForge, nice job! - Added restriction to prevent defining Word or CharsNotIn expressions with minimum length of 0 (should use Optional if this is desired), and enhanced docstrings to reflect this limitation. Issue was raised by Joey Tallieu, who submitted a patch with a slightly different solution. Thanks for taking the initiative, Joey, and please keep submitting your ideas! - Fixed bug in makeHTMLTags that did not detect HTML tag attributes with no '= value' portion (such as ""), reported by hamidh on the pyparsing wiki - thanks! - Fixed minor bug in makeHTMLTags and makeXMLTags, which did not accept whitespace in closing tags. Version 1.4.7 - July, 2007 -------------------------- - NEW NOTATION SHORTCUT: ParserElement now accepts results names using a notational shortcut, following the expression with the results name in parentheses. So this: stats = "AVE:" + realNum.setResultsName("average") + \ "MIN:" + realNum.setResultsName("min") + \ "MAX:" + realNum.setResultsName("max") can now be written as this: stats = "AVE:" + realNum("average") + \ "MIN:" + realNum("min") + \ "MAX:" + realNum("max") The intent behind this change is to make it simpler to define results names for significant fields within the expression, while keeping the grammar syntax clean and uncluttered. - Fixed bug when packrat parsing is enabled, with cached ParseResults being updated by subsequent parsing. Reported on the pyparsing wiki by Kambiz, thanks! - Fixed bug in operatorPrecedence for unary operators with left associativity, if multiple operators were given for the same term. - Fixed bug in example simpleBool.py, corrected precedence of "and" vs. "or" operations. - Fixed bug in Dict class, in which keys were converted to strings whether they needed to be or not. Have narrowed this logic to convert keys to strings only if the keys are ints (which would confuse __getitem__ behavior for list indexing vs. key lookup). - Added ParserElement method setBreak(), which will invoke the pdb module's set_trace() function when this expression is about to be parsed. - Fixed bug in StringEnd in which reading off the end of the input string raises an exception - should match. Resolved while answering a question for Shawn on the pyparsing wiki. Version 1.4.6 - April, 2007 --------------------------- - Simplified constructor for ParseFatalException, to support common exception construction idiom: raise ParseFatalException, "unexpected text: 'Spanish Inquisition'" - Added method getTokensEndLoc(), to be called from within a parse action, for those parse actions that need both the starting *and* ending location of the parsed tokens within the input text. - Enhanced behavior of keepOriginalText so that named parse fields are preserved, even though tokens are replaced with the original input text matched by the current expression. Also, cleaned up the stack traversal to be more robust. Suggested by Tim Arnold - thanks, Tim! - Fixed subtle bug in which countedArray (and similar dynamic expressions configured in parse actions) failed to match within Or, Each, FollowedBy, or NotAny. Reported by Ralf Vosseler, thanks for your patience, Ralf! - Fixed Unicode bug in upcaseTokens and downcaseTokens parse actions, scanString, and default debugging actions; reported (and patch submitted) by Nikolai Zamkovoi, spasibo! - Fixed bug when saving a tuple as a named result. The returned token list gave the proper tuple value, but accessing the result by name only gave the first element of the tuple. Reported by Poromenos, nice catch! - Fixed bug in makeHTMLTags/makeXMLTags, which failed to match tag attributes with namespaces. - Fixed bug in SkipTo when setting include=True, to have the skipped-to tokens correctly included in the returned data. Reported by gunars on the pyparsing wiki, thanks! - Fixed typobug in OnceOnly.reset method, omitted self argument. Submitted by eike welk, thanks for the lint-picking! - Added performance enhancement to Forward class, suggested by akkartik on the pyparsing Wiki discussion, nice work! - Added optional asKeyword to Word constructor, to indicate that the given word pattern should be matched only as a keyword, that is, it should only match if it is within word boundaries. - Added S-expression parser to examples directory. - Added macro substitution example to examples directory. - Added holaMundo.py example, excerpted from Marco Alfonso's blog - muchas gracias, Marco! - Modified internal cyclic references in ParseResults to use weakrefs; this should help reduce the memory footprint of large parsing programs, at some cost to performance (3-5%). Suggested by bca48150 on the pyparsing wiki, thanks! - Enhanced the documentation describing the vagaries and idiosyncracies of parsing strings with embedded tabs, and the impact on: . parse actions . scanString . col and line helper functions (Suggested by eike welk in response to some unexplained inconsistencies between parsed location and offsets in the input string.) - Cleaned up internal decorators to preserve function names, docstrings, etc. Version 1.4.5 - December, 2006 ------------------------------ - Removed debugging print statement from QuotedString class. Sorry for not stripping this out before the 1.4.4 release! - A significant performance improvement, the first one in a while! For my Verilog parser, this version of pyparsing is about double the speed - YMMV. - Added support for pickling of ParseResults objects. (Reported by Jeff Poole, thanks Jeff!) - Fixed minor bug in makeHTMLTags that did not recognize tag attributes with embedded '-' or '_' characters. Also, added support for passing expressions to makeHTMLTags and makeXMLTags, and used this feature to define the globals anyOpenTag and anyCloseTag. - Fixed error in alphas8bit, I had omitted the y-with-umlaut character. - Added punc8bit string to complement alphas8bit - it contains all the non-alphabetic, non-blank 8-bit characters. - Added commonHTMLEntity expression, to match common HTML "ampersand" codes, such as "<", ">", "&", " ", and """. This expression also defines a results name 'entity', which can be used to extract the entity field (that is, "lt", "gt", etc.). Also added built-in parse action replaceHTMLEntity, which can be attached to commonHTMLEntity to translate "<", ">", "&", " ", and """ to "<", ">", "&", " ", and "'". - Added example, htmlStripper.py, that strips HTML tags and scripts from HTML pages. It also translates common HTML entities to their respective characters. Version 1.4.4 - October, 2006 ------------------------------- - Fixed traceParseAction decorator to also trap and record exception returns from parse actions, and to handle parse actions with 0, 1, 2, or 3 arguments. - Enhanced parse action normalization to support using classes as parse actions; that is, the class constructor is called at parse time and the __init__ function is called with 0, 1, 2, or 3 arguments. If passing a class as a parse action, the __init__ method must use one of the valid parse action parameter list formats. (This technique is useful when using pyparsing to compile parsed text into a series of application objects - see the new example simpleBool.py.) - Fixed bug in ParseResults when setting an item using an integer index. (Reported by Christopher Lambacher, thanks!) - Fixed whitespace-skipping bug, patch submitted by Paolo Losi - grazie, Paolo! - Fixed bug when a Combine contained an embedded Forward expression, reported by cie on the pyparsing wiki - good catch! - Fixed listAllMatches bug, when a listAllMatches result was nested within another result. (Reported by don pasquale on comp.lang.python, well done!) - Fixed bug in ParseResults items() method, when returning an item marked as listAllMatches=True - Fixed bug in definition of cppStyleComment (and javaStyleComment) in which '//' line comments were not continued to the next line if the line ends with a '\'. (Reported by eagle-eyed Ralph Corderoy!) - Optimized re's for cppStyleComment and quotedString for better re performance - also provided by Ralph Corderoy, thanks! - Added new example, indentedGrammarExample.py, showing how to define a grammar using indentation to show grouping (as Python does for defining statement nesting). Instigated by an e-mail discussion with Andrew Dalke, thanks Andrew! - Added new helper operatorPrecedence (based on e-mail list discussion with Ralph Corderoy and Paolo Losi), to facilitate definition of grammars for expressions with unary and binary operators. For instance, this grammar defines a 6-function arithmetic expression grammar, with unary plus and minus, proper operator precedence,and right- and left-associativity: expr = operatorPrecedence( operand, [("!", 1, opAssoc.LEFT), ("^", 2, opAssoc.RIGHT), (oneOf("+ -"), 1, opAssoc.RIGHT), (oneOf("* /"), 2, opAssoc.LEFT), (oneOf("+ -"), 2, opAssoc.LEFT),] ) Also added example simpleArith.py and simpleBool.py to provide more detailed code samples using this new helper method. - Added new helpers matchPreviousLiteral and matchPreviousExpr, for creating adaptive parsing expressions that match the same content as was parsed in a previous parse expression. For instance: first = Word(nums) matchExpr = first + ":" + matchPreviousLiteral(first) will match "1:1", but not "1:2". Since this matches at the literal level, this will also match the leading "1:1" in "1:10". In contrast: first = Word(nums) matchExpr = first + ":" + matchPreviousExpr(first) will *not* match the leading "1:1" in "1:10"; the expressions are evaluated first, and then compared, so "1" is compared with "10". - Added keepOriginalText parse action. Sometimes pyparsing's whitespace-skipping leaves out too much whitespace. Adding this parse action will restore any internal whitespace for a parse expression. This is especially useful when defining expressions for scanString or transformString applications. - Added __add__ method for ParseResults class, to better support using Python sum built-in for summing ParseResults objects returned from scanString. - Added reset method for the new OnlyOnce class wrapper for parse actions (to allow a grammar to be used multiple times). - Added optional maxMatches argument to scanString and searchString, to short-circuit scanning after 'n' expression matches are found. Version 1.4.3 - July, 2006 ------------------------------ - Fixed implementation of multiple parse actions for an expression (added in 1.4.2). . setParseAction() reverts to its previous behavior, setting one (or more) actions for an expression, overwriting any action or actions previously defined . new method addParseAction() appends one or more parse actions to the list of parse actions attached to an expression Now it is harder to accidentally append parse actions to an expression, when what you wanted to do was overwrite whatever had been defined before. (Thanks, Jean-Paul Calderone!) - Simplified interface to parse actions that do not require all 3 parse action arguments. Very rarely do parse actions require more than just the parsed tokens, yet parse actions still require all 3 arguments including the string being parsed and the location within the string where the parse expression was matched. With this release, parse actions may now be defined to be called as: . fn(string,locn,tokens) (the current form) . fn(locn,tokens) . fn(tokens) . fn() The setParseAction and addParseAction methods will internally decorate the provided parse actions with compatible wrappers to conform to the full (string,locn,tokens) argument sequence. - REMOVED SUPPORT FOR RETURNING PARSE LOCATION FROM A PARSE ACTION. I announced this in March, 2004, and gave a final warning in the last release. Now you can return a tuple from a parse action, and it will be treated like any other return value (i.e., the tuple will be substituted for the incoming tokens passed to the parse action, which is useful when trying to parse strings into tuples). - Added setFailAction method, taking a callable function fn that takes the arguments fn(s,loc,expr,err) where: . s - string being parsed . loc - location where expression match was attempted and failed . expr - the parse expression that failed . err - the exception thrown The function returns no values. It may throw ParseFatalException if it is desired to stop parsing immediately. (Suggested by peter21081944 on wikispaces.com) - Added class OnlyOnce as helper wrapper for parse actions. OnlyOnce only permits a parse action to be called one time, after which all subsequent calls throw a ParseException. - Added traceParseAction decorator to help debug parse actions. Simply insert "@traceParseAction" ahead of the definition of your parse action, and each invocation will be displayed, along with incoming arguments, and returned value. - Fixed bug when copying ParserElements using copy() or setResultsName(). (Reported by Dan Thill, great catch!) - Fixed bug in asXML() where token text contains <, >, and & characters - generated XML now escapes these as <, > and &. (Reported by Jacek Sieka, thanks!) - Fixed bug in SkipTo() when searching for a StringEnd(). (Reported by Pete McEvoy, thanks Pete!) - Fixed "except Exception" statements, the most critical added as part of the packrat parsing enhancement. (Thanks, Erick Tryzelaar!) - Fixed end-of-string infinite looping on LineEnd and StringEnd expressions. (Thanks again to Erick Tryzelaar.) - Modified setWhitespaceChars to return self, to be consistent with other ParserElement modifiers. (Suggested by Erick Tryzelaar.) - Fixed bug/typo in new ParseResults.dump() method. - Fixed bug in searchString() method, in which only the first token of an expression was returned. searchString() now returns a ParseResults collection of all search matches. - Added example program removeLineBreaks.py, a string transformer that converts text files with hard line-breaks into one with line breaks only between paragraphs. - Added example program listAllMatches.py, to illustrate using the listAllMatches option when specifying results names (also shows new support for passing lists to oneOf). - Added example program linenoExample.py, to illustrate using the helper methods lineno, line, and col, and returning objects from a parse action. - Added example program parseListString.py, to which can parse the string representation of a Python list back into a true list. Taken mostly from my PyCon presentation examples, but now with support for tuple elements, too! Version 1.4.2 - April 1, 2006 (No foolin'!) ------------------------------------------- - Significant speedup from memoizing nested expressions (a technique known as "packrat parsing"), thanks to Chris Lesniewski-Laas! Your mileage may vary, but my Verilog parser almost doubled in speed to over 600 lines/sec! This speedup may break existing programs that use parse actions that have side-effects. For this reason, packrat parsing is disabled when you first import pyparsing. To activate the packrat feature, your program must call the class method ParserElement.enablePackrat(). If your program uses psyco to "compile as you go", you must call enablePackrat before calling psyco.full(). If you do not do this, Python will crash. For best results, call enablePackrat() immediately after importing pyparsing. - Added new helper method countedArray(expr), for defining patterns that start with a leading integer to indicate the number of array elements, followed by that many elements, matching the given expr parse expression. For instance, this two-liner: wordArray = countedArray(Word(alphas)) print wordArray.parseString("3 Practicality beats purity")[0] returns the parsed array of words: ['Practicality', 'beats', 'purity'] The leading token '3' is suppressed, although it is easily obtained from the length of the returned array. (Inspired by e-mail discussion with Ralf Vosseler.) - Added support for attaching multiple parse actions to a single ParserElement. (Suggested by Dan "Dang" Griffith - nice idea, Dan!) - Added support for asymmetric quoting characters in the recently-added QuotedString class. Now you can define your own quoted string syntax like "<>". To define this custom form of QuotedString, your code would define: dblAngleQuotedString = QuotedString('<<',endQuoteChar='>>') QuotedString also supports escaped quotes, escape character other than '\', and multiline. - Changed the default value returned internally by Optional, so that None can be used as a default value. (Suggested by Steven Bethard - I finally saw the light!) - Added dump() method to ParseResults, to make it easier to list out and diagnose values returned from calling parseString. - A new example, a search query string parser, submitted by Steven Mooij and Rudolph Froger - a very interesting application, thanks! - Added an example that parses the BNF in Python's Grammar file, in support of generating Python grammar documentation. (Suggested by J H Stovall.) - A new example, submitted by Tim Cera, of a flexible parser module, using a simple config variable to adjust parsing for input formats that have slight variations - thanks, Tim! - Added an example for parsing Roman numerals, showing the capability of parse actions to "compile" Roman numerals into their integer values during parsing. - Added a new docs directory, for additional documentation or help. Currently, this includes the text and examples from my recent presentation at PyCon. - Fixed another typo in CaselessKeyword, thanks Stefan Behnel. - Expanded oneOf to also accept tuples, not just lists. This really should be sufficient... - Added deprecation warnings when tuple is returned from a parse action. Looking back, I see that I originally deprecated this feature in March, 2004, so I'm guessing people really shouldn't have been using this feature - I'll drop it altogether in the next release, which will allow users to return a tuple from a parse action (which is really handy when trying to reconstuct tuples from a tuple string representation!). Version 1.4.1 - February, 2006 ------------------------------ - Converted generator expression in QuotedString class to list comprehension, to retain compatibility with Python 2.3. (Thanks, Titus Brown for the heads-up!) - Added searchString() method to ParserElement, as an alternative to using "scanString(instring).next()[0][0]" to search through a string looking for a substring matching a given parse expression. (Inspired by e-mail conversation with Dave Feustel.) - Modified oneOf to accept lists of strings as well as a single string of space-delimited literals. (Suggested by Jacek Sieka - thanks!) - Removed deprecated use of Upcase in pyparsing test code. (Also caught by Titus Brown.) - Removed lstrip() call from Literal - too aggressive in stripping whitespace which may be valid for some grammars. (Point raised by Jacek Sieka). Also, made Literal more robust in the event of passing an empty string. - Fixed bug in replaceWith when returning None. - Added cautionary documentation for Forward class when assigning a MatchFirst expression, as in: fwdExpr << a | b | c Precedence of operators causes this to be evaluated as: (fwdExpr << a) | b | c thereby leaving b and c out as parseable alternatives. Users must explicitly group the values inserted into the Forward: fwdExpr << (a | b | c) (Suggested by Scot Wilcoxon - thanks, Scot!) Version 1.4 - January 18, 2006 ------------------------------ - Added Regex class, to permit definition of complex embedded expressions using regular expressions. (Enhancement provided by John Beisley, great job!) - Converted implementations of Word, oneOf, quoted string, and comment helpers to utilize regular expression matching. Performance improvements in the 20-40% range. - Added QuotedString class, to support definition of non-standard quoted strings (Suggested by Guillaume Proulx, thanks!) - Added CaselessKeyword class, to streamline grammars with, well, caseless keywords (Proposed by Stefan Behnel, thanks!) - Fixed bug in SkipTo, when using an ignoreable expression. (Patch provided by Anonymous, thanks, whoever-you-are!) - Fixed typo in NoMatch class. (Good catch, Stefan Behnel!) - Fixed minor bug in _makeTags(), using string.printables instead of pyparsing.printables. - Cleaned up some of the expressions created by makeXXXTags helpers, to suppress extraneous <> characters. - Added some grammar definition-time checking to verify that a grammar is being built using proper ParserElements. - Added examples: . LAparser.py - linear algebra C preprocessor (submitted by Mike Ellis, thanks Mike!) . wordsToNum.py - converts word description of a number back to the original number (such as 'one hundred and twenty three' -> 123) . updated fourFn.py to support unary minus, added BNF comments Version 1.3.3 - September 12, 2005 ---------------------------------- - Improved support for Unicode strings that would be returned using srange. Added greetingInKorean.py example, for a Korean version of "Hello, World!" using Unicode. (Thanks, June Kim!) - Added 'hexnums' string constant (nums+"ABCDEFabcdef") for defining hexadecimal value expressions. - NOTE: ===THIS CHANGE MAY BREAK EXISTING CODE=== Modified tag and results definitions returned by makeHTMLTags(), to better support the looseness of HTML parsing. Tags to be parsed are now caseless, and keys generated for tag attributes are now converted to lower case. Formerly, makeXMLTags("XYZ") would return a tag with results name of "startXYZ", this has been changed to "startXyz". If this tag is matched against '', the matched keys formerly would be "Abc", "DEF", and "ghi"; keys are now converted to lower case, giving keys of "abc", "def", and "ghi". These changes were made to try to address the lax case sensitivity agreement between start and end tags in many HTML pages. No changes were made to makeXMLTags(), which assumes more rigorous parsing rules. Also, cleaned up case-sensitivity bugs in closing tags, and switched to using Keyword instead of Literal class for tags. (Thanks, Steve Young, for getting me to look at these in more detail!) - Added two helper parse actions, upcaseTokens and downcaseTokens, which will convert matched text to all uppercase or lowercase, respectively. - Deprecated Upcase class, to be replaced by upcaseTokens parse action. - Converted messages sent to stderr to use warnings module, such as when constructing a Literal with an empty string, one should use the Empty() class or the empty helper instead. - Added ' ' (space) as an escapable character within a quoted string. - Added helper expressions for common comment types, in addition to the existing cStyleComment (/*...*/) and htmlStyleComment () . dblSlashComment = // ... (to end of line) . cppStyleComment = cStyleComment or dblSlashComment . javaStyleComment = cppStyleComment . pythonStyleComment = # ... (to end of line) Version 1.3.2 - July 24, 2005 ----------------------------- - Added Each class as an enhanced version of And. 'Each' requires that all given expressions be present, but may occur in any order. Special handling is provided to group ZeroOrMore and OneOrMore elements that occur out-of-order in the input string. You can also construct 'Each' objects by joining expressions with the '&' operator. When using the Each class, results names are strongly recommended for accessing the matched tokens. (Suggested by Pradam Amini - thanks, Pradam!) - Stricter interpretation of 'max' qualifier on Word elements. If the 'max' attribute is specified, matching will fail if an input field contains more than 'max' consecutive body characters. For example, previously, Word(nums,max=3) would match the first three characters of '0123456', returning '012' and continuing parsing at '3'. Now, when constructed using the max attribute, Word will raise an exception with this string. - Cleaner handling of nested dictionaries returned by Dict. No longer necessary to dereference sub-dictionaries as element [0] of their parents. === NOTE: THIS CHANGE MAY BREAK SOME EXISTING CODE, BUT ONLY IF PARSING NESTED DICTIONARIES USING THE LITTLE-USED DICT CLASS === (Prompted by discussion thread on the Python Tutor list, with contributions from Danny Yoo, Kent Johnson, and original post by Liam Clarke - thanks all!) Version 1.3.1 - June, 2005 ---------------------------------- - Added markInputline() method to ParseException, to display the input text line location of the parsing exception. (Thanks, Stefan Behnel!) - Added setDefaultKeywordChars(), so that Keyword definitions using a custom keyword character set do not all need to add the keywordChars constructor argument (similar to setDefaultWhitespaceChars()). (suggested by rzhanka on the SourceForge pyparsing forum.) - Simplified passing debug actions to setDebugAction(). You can now pass 'None' for a debug action if you want to take the default debug behavior. To suppress a particular debug action, you can pass the pyparsing method nullDebugAction. - Refactored parse exception classes, moved all behavior to ParseBaseException, and the former ParseException is now a subclass of ParseBaseException. Added a second subclass, ParseFatalException, as a subclass of ParseBaseException. User-defined parse actions can raise ParseFatalException if a data inconsistency is detected (such as a begin-tag/end-tag mismatch), and this will stop all parsing immediately. (Inspired by e-mail thread with Michele Petrazzo - thanks, Michelle!) - Added helper methods makeXMLTags and makeHTMLTags, that simplify the definition of XML or HTML tag parse expressions for a given tagname. Both functions return a pair of parse expressions, one for the opening tag (that is, '') and one for the closing tag (''). The opening tagame also recognizes any attribute definitions that have been included in the opening tag, as well as an empty tag (one with a trailing '/', as in '' which is equivalent to ''). makeXMLTags uses stricter XML syntax for attributes, requiring that they be enclosed in double quote characters - makeHTMLTags is more lenient, and accepts single-quoted strings or any contiguous string of characters up to the next whitespace character or '>' character. Attributes can be retrieved as dictionary or attribute values of the returned results from the opening tag. - Added example minimath2.py, a refinement on fourFn.py that adds an interactive session and support for variables. (Thanks, Steven Siew!) - Added performance improvement, up to 20% reduction! (Found while working with Wolfgang Borgert on performance tuning of his TTCN3 parser.) - And another performance improvement, up to 25%, when using scanString! (Found while working with Henrik Westlund on his C header file scanner.) - Updated UML diagrams to reflect latest class/method changes. Version 1.3 - March, 2005 ---------------------------------- - Added new Keyword class, as a special form of Literal. Keywords must be followed by whitespace or other non-keyword characters, to distinguish them from variables or other identifiers that just happen to start with the same characters as a keyword. For instance, the input string containing "ifOnlyIfOnly" will match a Literal("if") at the beginning and in the middle, but will fail to match a Keyword("if"). Keyword("if") will match only strings such as "if only" or "if(only)". (Proposed by Wolfgang Borgert, and Berteun Damman separately requested this on comp.lang.python - great idea!) - Added setWhitespaceChars() method to override the characters to be skipped as whitespace before matching a particular ParseElement. Also added the class-level method setDefaultWhitespaceChars(), to allow users to override the default set of whitespace characters (space, tab, newline, and return) for all subsequently defined ParseElements. (Inspired by Klaas Hofstra's inquiry on the Sourceforge pyparsing forum.) - Added helper parse actions to support some very common parse action use cases: . replaceWith(replStr) - replaces the matching tokens with the provided replStr replacement string; especially useful with transformString() . removeQuotes - removes first and last character from string enclosed in quotes (note - NOT the same as the string strip() method, as only a single character is removed at each end) - Added copy() method to ParseElement, to make it easier to define different parse actions for the same basic parse expression. (Note, copy is implicitly called when using setResultsName().) (The following changes were posted to CVS as Version 1.2.3 - October-December, 2004) - Added support for Unicode strings in creating grammar definitions. (Big thanks to Gavin Panella!) - Added constant alphas8bit to include the following 8-bit characters: ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ - Added srange() function to simplify definition of Word elements, using regexp-like '[A-Za-z0-9]' syntax. This also simplifies referencing common 8-bit characters. - Fixed bug in Dict when a single element Dict was embedded within another Dict. (Thanks Andy Yates for catching this one!) - Added 'formatted' argument to ParseResults.asXML(). If set to False, suppresses insertion of whitespace for pretty-print formatting. Default equals True for backward compatibility. - Added setDebugActions() function to ParserElement, to allow user-defined debugging actions. - Added support for escaped quotes (either in \', \", or doubled quote form) to the predefined expressions for quoted strings. (Thanks, Ero Carrera!) - Minor performance improvement (~5%) converting "char in string" tests to "char in dict". (Suggested by Gavin Panella, cool idea!) Version 1.2.2 - September 27, 2004 ---------------------------------- - Modified delimitedList to accept an expression as the delimiter, instead of only accepting strings. - Modified ParseResults, to convert integer field keys to strings (to avoid confusion with list access). - Modified Combine, to convert all embedded tokens to strings before combining. - Fixed bug in MatchFirst in which parse actions would be called for expressions that only partially match. (Thanks, John Hunter!) - Fixed bug in fourFn.py example that fixes right-associativity of ^ operator. (Thanks, Andrea Griffini!) - Added class FollowedBy(expression), to look ahead in the input string without consuming tokens. - Added class NoMatch that never matches any input. Can be useful in debugging, and in very specialized grammars. - Added example pgn.py, for parsing chess game files stored in Portable Game Notation. (Thanks, Alberto Santini!) Version 1.2.1 - August 19, 2004 ------------------------------- - Added SkipTo(expression) token type, simplifying grammars that only want to specify delimiting expressions, and want to match any characters between them. - Added helper method dictOf(key,value), making it easier to work with the Dict class. (Inspired by Pavel Volkovitskiy, thanks!). - Added optional argument listAllMatches (default=False) to setResultsName(). Setting listAllMatches to True overrides the default modal setting of tokens to results names; instead, the results name acts as an accumulator for all matching tokens within the local repetition group. (Suggested by Amaury Le Leyzour - thanks!) - Fixed bug in ParseResults, throwing exception when trying to extract slice, or make a copy using [:]. (Thanks, Wilson Fowlie!) - Fixed bug in transformString() when the input string contains 's (Thanks, Rick Walia!). - Fixed bug in returning tokens from un-Grouped And's, Or's and MatchFirst's, where too many tokens would be included in the results, confounding parse actions and returned results. - Fixed bug in naming ParseResults returned by And's, Or's, and Match First's. - Fixed bug in LineEnd() - matching this token now correctly consumes and returns the end of line "\n". - Added a beautiful example for parsing Mozilla calendar files (Thanks, Petri Savolainen!). - Added support for dynamically modifying Forward expressions during parsing. Version 1.2 - 20 June 2004 -------------------------- - Added definition for htmlComment to help support HTML scanning and parsing. - Fixed bug in generating XML for Dict classes, in which trailing item was duplicated in the output XML. - Fixed release bug in which scanExamples.py was omitted from release files. - Fixed bug in transformString() when parse actions are not defined on the outermost parser element. - Added example urlExtractor.py, as another example of using scanString and parse actions. Version 1.2beta3 - 4 June 2004 ------------------------------ - Added White() token type, analogous to Word, to match on whitespace characters. Use White in parsers with significant whitespace (such as configuration file parsers that use indentation to indicate grouping). Construct White with a string containing the whitespace characters to be matched. Similar to Word, White also takes optional min, max, and exact parameters. - As part of supporting whitespace-signficant parsing, added parseWithTabs() method to ParserElement, to override the default behavior in parseString of automatically expanding tabs to spaces. To retain tabs during parsing, call parseWithTabs() before calling parseString(), parseFile() or scanString(). (Thanks, Jean-Guillaume Paradis for catching this, and for your suggestions on whitespace-significant parsing.) - Added transformString() method to ParseElement, as a complement to scanString(). To use transformString, define a grammar and attach a parse action to the overall grammar that modifies the returned token list. Invoking transformString() on a target string will then scan for matches, and replace the matched text patterns according to the logic in the parse action. transformString() returns the resulting transformed string. (Note: transformString() does *not* automatically expand tabs to spaces.) Also added scanExamples.py to the examples directory to show sample uses of scanString() and transformString(). - Removed group() method that was introduced in beta2. This turns out NOT to be equivalent to nesting within a Group() object, and I'd prefer not to sow more seeds of confusion. - Fixed behavior of asXML() where tags for groups were incorrectly duplicated. (Thanks, Brad Clements!) - Changed beta version message to display to stderr instead of stdout, to make asXML() easier to use. (Thanks again, Brad.) Version 1.2beta2 - 19 May 2004 ------------------------------ - *** SIMPLIFIED API *** - Parse actions that do not modify the list of tokens no longer need to return a value. This simplifies those parse actions that use the list of tokens to update a counter or record or display some of the token content; these parse actions can simply end without having to specify 'return toks'. - *** POSSIBLE API INCOMPATIBILITY *** - Fixed CaselessLiteral bug, where the returned token text was not the original string (as stated in the docs), but the original string converted to upper case. (Thanks, Dang Griffith!) **NOTE: this may break some code that relied on this erroneous behavior. Users should scan their code for uses of CaselessLiteral.** - *** POSSIBLE CODE INCOMPATIBILITY *** - I have renamed the internal attributes on ParseResults from 'dict' and 'list' to '__tokdict' and '__toklist', to avoid collisions with user-defined data fields named 'dict' and 'list'. Any client code that accesses these attributes directly will need to be modified. Hopefully the implementation of methods such as keys(), items(), len(), etc. on ParseResults will make such direct attribute accessess unnecessary. - Added asXML() method to ParseResults. This greatly simplifies the process of parsing an input data file and generating XML-structured data. - Added getName() method to ParseResults. This method is helpful when a grammar specifies ZeroOrMore or OneOrMore of a MatchFirst or Or expression, and the parsing code needs to know which expression matched. (Thanks, Eric van der Vlist, for this idea!) - Added items() and values() methods to ParseResults, to better support using ParseResults as a Dictionary. - Added parseFile() as a convenience function to parse the contents of an entire text file. Accepts either a file name or a file object. (Thanks again, Dang!) - Added group() method to And, Or, and MatchFirst, as a short-cut alternative to enclosing a construct inside a Group object. - Extended fourFn.py to support exponentiation, and simple built-in functions. - Added EBNF parser to examples, including a demo where it parses its own EBNF! (Thanks to Seo Sanghyeon!) - Added Delphi Form parser to examples, dfmparse.py, plus a couple of sample Delphi forms as tests. (Well done, Dang!) - Another performance speedup, 5-10%, inspired by Dang! Plus about a 20% speedup, by pre-constructing and cacheing exception objects instead of constructing them on the fly. - Fixed minor bug when specifying oneOf() with 'caseless=True'. - Cleaned up and added a few more docstrings, to improve the generated docs. Version 1.1.2 - 21 Mar 2004 --------------------------- - Fixed minor bug in scanString(), so that start location is at the start of the matched tokens, not at the start of the whitespace before the matched tokens. - Inclusion of HTML documentation, generated using Epydoc. Reformatted some doc strings to better generate readable docs. (Beautiful work, Ed Loper, thanks for Epydoc!) - Minor performance speedup, 5-15% - And on a process note, I've used the unittest module to define a series of unit tests, to help avoid the embarrassment of the version 1.1 snafu. Version 1.1.1 - 6 Mar 2004 -------------------------- - Fixed critical bug introduced in 1.1, which broke MatchFirst(!) token matching. **THANK YOU, SEO SANGHYEON!!!** - Added "from future import __generators__" to permit running under pre-Python 2.3. - Added example getNTPservers.py, showing how to use pyparsing to extract a text pattern from the HTML of a web page. Version 1.1 - 3 Mar 2004 ------------------------- - ***Changed API*** - While testing out parse actions, I found that the value of loc passed in was not the starting location of the matched tokens, but the location of the next token in the list. With this version, the location passed to the parse action is now the starting location of the tokens that matched. A second part of this change is that the return value of parse actions no longer needs to return a tuple containing both the location and the parsed tokens (which may optionally be modified); parse actions only need to return the list of tokens. Parse actions that return a tuple are deprecated; they will still work properly for conversion/compatibility, but this behavior will be removed in a future version. - Added validate() method, to help diagnose infinite recursion in a grammar tree. validate() is not 100% fool-proof, but it can help track down nasty infinite looping due to recursively referencing the same grammar construct without some intervening characters. - Cleaned up default listing of some parse element types, to more closely match ordinary BNF. Instead of the form :[contents-list], some changes are: . And(token1,token2,token3) is "{ token1 token2 token3 }" . Or(token1,token2,token3) is "{ token1 ^ token2 ^ token3 }" . MatchFirst(token1,token2,token3) is "{ token1 | token2 | token3 }" . Optional(token) is "[ token ]" . OneOrMore(token) is "{ token }..." . ZeroOrMore(token) is "[ token ]..." - Fixed an infinite loop in oneOf if the input string contains a duplicated option. (Thanks Brad Clements) - Fixed a bug when specifying a results name on an Optional token. (Thanks again, Brad Clements) - Fixed a bug introduced in 1.0.6 when I converted quotedString to use CharsNotIn; I accidentally permitted quoted strings to span newlines. I have fixed this in this version to go back to the original behavior, in which quoted strings do *not* span newlines. - Fixed minor bug in HTTP server log parser. (Thanks Jim Richardson) Version 1.0.6 - 13 Feb 2004 ---------------------------- - Added CharsNotIn class (Thanks, Lee SangYeong). This is the opposite of Word, in that it is constructed with a set of characters *not* to be matched. (This enhancement also allowed me to clean up and simplify some of the definitions for quoted strings, cStyleComment, and restOfLine.) - **MINOR API CHANGE** - Added joinString argument to the __init__ method of Combine (Thanks, Thomas Kalka). joinString defaults to "", but some applications might choose some other string to use instead, such as a blank or newline. joinString was inserted as the second argument to __init__, so if you have code that specifies an adjacent value, without using 'adjacent=', this code will break. - Modified LineStart to recognize the start of an empty line. - Added optional caseless flag to oneOf(), to create a list of CaselessLiteral tokens instead of Literal tokens. - Added some enhancements to the SQL example: . Oracle-style comments (Thanks to Harald Armin Massa) . simple WHERE clause - Minor performance speedup - 5-15% Version 1.0.5 - 19 Jan 2004 ---------------------------- - Added scanString() generator method to ParseElement, to support regex-like pattern-searching - Added items() list to ParseResults, to return named results as a list of (key,value) pairs - Fixed memory overflow in asList() for deeply nested ParseResults (Thanks, Sverrir Valgeirsson) - Minor performance speedup - 10-15% Version 1.0.4 - 8 Jan 2004 --------------------------- - Added positional tokens StringStart, StringEnd, LineStart, and LineEnd - Added commaSeparatedList to pre-defined global token definitions; also added commasep.py to the examples directory, to demonstrate the differences between parsing comma-separated data and simple line-splitting at commas - Minor API change: delimitedList does not automatically enclose the list elements in a Group, but makes this the responsibility of the caller; also, if invoked using 'combine=True', the list delimiters are also included in the returned text (good for scoped variables, such as a.b.c or a::b::c, or for directory paths such as a/b/c) - Performance speed-up again, 30-40% - Added httpServerLogParser.py to examples directory, as this is a common parsing task Version 1.0.3 - 23 Dec 2003 --------------------------- - Performance speed-up again, 20-40% - Added Python distutils installation setup.py, etc. (thanks, Dave Kuhlman) Version 1.0.2 - 18 Dec 2003 --------------------------- - **NOTE: Changed API again!!!** (for the last time, I hope) + Renamed module from parsing to pyparsing, to better reflect Python linkage. - Also added dictExample.py to examples directory, to illustrate usage of the Dict class. Version 1.0.1 - 17 Dec 2003 --------------------------- - **NOTE: Changed API!** + Renamed 'len' argument on Word.__init__() to 'exact' - Performance speed-up, 10-30% Version 1.0.0 - 15 Dec 2003 --------------------------- - Initial public release Version 0.1.1 thru 0.1.17 - October-November, 2003 -------------------------------------------------- - initial development iterations: - added Dict, Group - added helper methods oneOf, delimitedList - added helpers quotedString (and double and single), restOfLine, cStyleComment - added MatchFirst as an alternative to the slower Or - added UML class diagram - fixed various logic bugs pyparsing-2.1.10/docs/0000777000000000000000000000000012775575715012716 5ustar 00000000000000pyparsing-2.1.10/docs/HowToUsePyparsing.html0000666000000000000000000020762412171434766017217 0ustar 00000000000000 Using the pyparsing module

Using the pyparsing module

Author: Paul McGuire
Address: 
ptmcg@users.sourceforge.net
Revision: 2.0.1
Date: July, 2013
Copyright: Copyright © 2003-2013 Paul McGuire.
abstract:This document provides how-to instructions for the pyparsing library, an easy-to-use Python module for constructing and executing basic text parsers. The pyparsing module is useful for evaluating user-definable expressions, processing custom application language commands, or extracting data from formatted reports.

1   Steps to follow

To parse an incoming data string, the client code must follow these steps:

  1. First define the tokens and patterns to be matched, and assign this to a program variable. Optional results names or parsing actions can also be defined at this time.
  2. Call parseString() or scanString() on this variable, passing in the string to be parsed. During the matching process, whitespace between tokens is skipped by default (although this can be changed). When token matches occur, any defined parse action methods are called.
  3. Process the parsed results, returned as a list of strings. Matching results may also be accessed as named attributes of the returned results, if names are defined in the definition of the token pattern, using setResultsName().

1.1   Hello, World!

The following complete Python program will parse the greeting "Hello, World!", or any other greeting of the form "<salutation>, <addressee>!":

from pyparsing import Word, alphas

greet = Word( alphas ) + "," + Word( alphas ) + "!"
greeting = greet.parseString( "Hello, World!" )
print greeting

The parsed tokens are returned in the following form:

['Hello', ',', 'World', '!']

1.2   Usage notes

  • The pyparsing module can be used to interpret simple command strings or algebraic expressions, or can be used to extract data from text reports with complicated format and structure ("screen or report scraping"). However, it is possible that your defined matching patterns may accept invalid inputs. Use pyparsing to extract data from strings assumed to be well-formatted.

  • To keep up the readability of your code, use operators such as +, |, ^, and ~ to combine expressions. You can also combine string literals with ParseExpressions - they will be automatically converted to Literal objects. For example:

    integer  = Word( nums )            # simple unsigned integer
variable = Word( alphas, max=1 )   # single letter variable, such as x, z, m, etc.
arithOp  = Word( "+-*/", max=1 )   # arithmetic operators
equation = variable + "=" + integer + arithOp + integer    # will match "x=2+2", etc.

    In the definition of equation, the string "=" will get added as a Literal("="), but in a more readable way.

  • The pyparsing module's default behavior is to ignore whitespace. This is the case for 99% of all parsers ever written. This allows you to write simple, clean, grammars, such as the above equation, without having to clutter it up with extraneous ws markers. The equation grammar will successfully parse all of the following statements:

    x=2+2
x = 2+2
a = 10   *   4
r= 1234/ 100000

    Of course, it is quite simple to extend this example to support more elaborate expressions, with nesting with parentheses, floating point numbers, scientific notation, and named constants (such as e or pi). See fourFn.py, included in the examples directory.

  • To modify pyparsing's default whitespace skipping, you can use one or more of the following methods:

    • use the static method ParserElement.setDefaultWhitespaceChars to override the normal set of whitespace chars (' tn'). For instance when defining a grammar in which newlines are significant, you should call ParserElement.setDefaultWhitespaceChars(' \t') to remove newline from the set of skippable whitespace characters. Calling this method will affect all pyparsing expressions defined afterward.

    • call leaveWhitespace() on individual expressions, to suppress the skipping of whitespace before trying to match the expression

    • use Combine to require that successive expressions must be adjacent in the input string. For instance, this expression:

      real = Word(nums) + '.' + Word(nums)

      will match "3.14159", but will also match "3 . 12". It will also return the matched results as ['3', '.', '14159']. By changing this expression to:

      real = Combine( Word(nums) + '.' + Word(nums) )

      it will not match numbers with embedded spaces, and it will return a single concatenated string '3.14159' as the parsed token.

  • Repetition of expressions can be indicated using the '*' operator. An expression may be multiplied by an integer value (to indicate an exact repetition count), or by a tuple containing two integers, or None and an integer, representing min and max repetitions (with None representing no min or no max, depending whether it is the first or second tuple element). See the following examples, where n is used to indicate an integer value:

    • expr*3 is equivalent to expr + expr + expr
    • expr*(2,3) is equivalent to expr + expr + Optional(expr)
    • expr*(n,None) or expr*(n,) is equivalent to expr*n + ZeroOrMore(expr) (read as "at least n instances of expr")
    • expr*(None,n) is equivalent to expr*(0,n) (read as "0 to n instances of expr")
    • expr*(None,None) is equivalent to ZeroOrMore(expr)
    • expr*(1,None) is equivalent to OneOrMore(expr)

    Note that expr*(None,n) does not raise an exception if more than n exprs exist in the input stream; that is, expr*(None,n) does not enforce a maximum number of expr occurrences. If this behavior is desired, then write expr*(None,n) + ~expr.

  • MatchFirst expressions are matched left-to-right, and the first match found will skip all later expressions within, so be sure to define less-specific patterns after more-specific patterns. If you are not sure which expressions are most specific, use Or expressions (defined using the ^ operator) - they will always match the longest expression, although they are more compute-intensive.

  • Or expressions will evaluate all of the specified subexpressions to determine which is the "best" match, that is, which matches the longest string in the input data. In case of a tie, the left-most expression in the Or list will win.

  • If parsing the contents of an entire file, pass it to the parseFile method using:

    expr.parseFile( sourceFile )

  • ParseExceptions will report the location where an expected token or expression failed to match. For example, if we tried to use our "Hello, World!" parser to parse "Hello World!" (leaving out the separating comma), we would get an exception, with the message:

    pyparsing.ParseException: Expected "," (6), (1,7)

    In the case of complex expressions, the reported location may not be exactly where you would expect. See more information under ParseException .

  • Use the Group class to enclose logical groups of tokens within a sublist. This will help organize your results into more hierarchical form (the default behavior is to return matching tokens as a flat list of matching input strings).

  • Punctuation may be significant for matching, but is rarely of much interest in the parsed results. Use the suppress() method to keep these tokens from cluttering up your returned lists of tokens. For example, delimitedList() matches a succession of one or more expressions, separated by delimiters (commas by default), but only returns a list of the actual expressions - the delimiters are used for parsing, but are suppressed from the returned output.

  • Parse actions can be used to convert values from strings to other data types (ints, floats, booleans, etc.).

  • Results names are recommended for retrieving tokens from complex expressions. It is much easier to access a token using its field name than using a positional index, especially if the expression contains optional elements. You can also shortcut the setResultsName call:

    stats = "AVE:" + realNum.setResultsName("average") + \
        "MIN:" + realNum.setResultsName("min") + \
        "MAX:" + realNum.setResultsName("max")

    can now be written as this:

    stats = "AVE:" + realNum("average") + \
        "MIN:" + realNum("min") + \
        "MAX:" + realNum("max")

  • Be careful when defining parse actions that modify global variables or data structures (as in fourFn.py), especially for low level tokens or expressions that may occur within an And expression; an early element of an And may match, but the overall expression may fail.

  • Performance of pyparsing may be slow for complex grammars and/or large input strings. The psyco package can be used to improve the speed of the pyparsing module with no changes to grammar or program logic - observed improvments have been in the 20-50% range.

2   Classes

2.1   Classes in the pyparsing module

ParserElement - abstract base class for all pyparsing classes; methods for code to use are:

  • parseString( sourceString, parseAll=False ) - only called once, on the overall matching pattern; returns a ParseResults object that makes the matched tokens available as a list, and optionally as a dictionary, or as an object with named attributes; if parseAll is set to True, then parseString will raise a ParseException if the grammar does not process the complete input string.

  • parseFile( sourceFile ) - a convenience function, that accepts an input file object or filename. The file contents are passed as a string to parseString(). parseFile also supports the parseAll argument.

  • scanString( sourceString ) - generator function, used to find and extract matching text in the given source string; for each matched text, returns a tuple of:

    • matched tokens (packaged as a ParseResults object)
    • start location of the matched text in the given source string
    • end location in the given source string

    scanString allows you to scan through the input source string for random matches, instead of exhaustively defining the grammar for the entire source text (as would be required with parseString).

  • transformString( sourceString ) - convenience wrapper function for scanString, to process the input source string, and replace matching text with the tokens returned from parse actions defined in the grammar (see setParseAction).

  • searchString( sourceString ) - another convenience wrapper function for scanString, returns a list of the matching tokens returned from each call to scanString.

  • setName( name ) - associate a short descriptive name for this element, useful in displaying exceptions and trace information

  • setResultsName( string, listAllMatches=False ) - name to be given to tokens matching the element; if multiple tokens within a repetition group (such as ZeroOrMore or delimitedList) the default is to return only the last matching token - if listAllMatches is set to True, then a list of all the matching tokens is returned. (New in 1.5.6 - a results name with a trailing '*' character will be interpreted as setting listAllMatches to True.) Note: setResultsName returns a copy of the element so that a single basic element can be referenced multiple times and given different names within a complex grammar.

  • setParseAction( *fn ) - specify one or more functions to call after successful matching of the element; each function is defined as fn( s, loc, toks ), where:

    • s is the original parse string
    • loc is the location in the string where matching started
    • toks is the list of the matched tokens, packaged as a ParseResults object

    Multiple functions can be attached to a ParserElement by specifying multiple arguments to setParseAction, or by calling setParseAction multiple times.

    Each parse action function can return a modified toks list, to perform conversion, or string modifications. For brevity, fn may also be a lambda - here is an example of using a parse action to convert matched integer tokens from strings to integers:

    intNumber = Word(nums).setParseAction( lambda s,l,t: [ int(t[0]) ] )

    If fn does not modify the toks list, it does not need to return anything at all.

  • setBreak( breakFlag=True ) - if breakFlag is True, calls pdb.set_break() as this expression is about to be parsed

  • copy() - returns a copy of a ParserElement; can be used to use the same parse expression in different places in a grammar, with different parse actions attached to each

  • leaveWhitespace() - change default behavior of skipping whitespace before starting matching (mostly used internally to the pyparsing module, rarely used by client code)

  • setWhitespaceChars( chars ) - define the set of chars to be ignored as whitespace before trying to match a specific ParserElement, in place of the default set of whitespace (space, tab, newline, and return)

  • setDefaultWhitespaceChars( chars ) - class-level method to override the default set of whitespace chars for all subsequently created ParserElements (including copies); useful when defining grammars that treat one or more of the default whitespace characters as significant (such as a line-sensitive grammar, to omit newline from the list of ignorable whitespace)

  • suppress() - convenience function to suppress the output of the given element, instead of wrapping it with a Suppress object.

  • ignore( expr ) - function to specify parse expression to be ignored while matching defined patterns; can be called repeatedly to specify multiple expressions; useful to specify patterns of comment syntax, for example

  • setDebug( dbgFlag=True ) - function to enable/disable tracing output when trying to match this element

  • validate() - function to verify that the defined grammar does not contain infinitely recursive constructs

  • parseWithTabs() - function to override default behavior of converting tabs to spaces before parsing the input string; rarely used, except when specifying whitespace-significant grammars using the White class.
  • enablePackrat() - a class-level static method to enable a memoizing performance enhancement, known as "packrat parsing". packrat parsing is disabled by default, since it may conflict with some user programs that use parse actions. To activate the packrat feature, your program must call the class method ParserElement.enablePackrat(). If your program uses psyco to "compile as you go", you must call enablePackrat before calling psyco.full(). If you do not do this, Python will crash. For best results, call enablePackrat() immediately after importing pyparsing.

2.2   Basic ParserElement subclasses

  • Literal - construct with a string to be matched exactly
  • CaselessLiteral - construct with a string to be matched, but without case checking; results are always returned as the defining literal, NOT as they are found in the input string
  • Keyword - similar to Literal, but must be immediately followed by whitespace, punctuation, or other non-keyword characters; prevents accidental matching of a non-keyword that happens to begin with a defined keyword
  • CaselessKeyword - similar to Keyword, but with caseless matching behavior

  • Word - one or more contiguous characters; construct with a string containing the set of allowed initial characters, and an optional second string of allowed body characters; for instance, a common Word construct is to match a code identifier - in C, a valid identifier must start with an alphabetic character or an underscore ('_'), followed by a body that can also include numeric digits. That is, a, i, MAX_LENGTH, _a1, b_109_, and plan9FromOuterSpace are all valid identifiers; 9b7z, $a, .section, and 0debug are not. To define an identifier using a Word, use either of the following:

    - Word( alphas+"_", alphanums+"_" )
- Word( srange("[a-zA-Z_]"), srange("[a-zA-Z0-9_]") )

    If only one string given, it specifies that the same character set defined for the initial character is used for the word body; for instance, to define an identifier that can only be composed of capital letters and underscores, use:

    - Word( "ABCDEFGHIJKLMNOPQRSTUVWXYZ_" )
- Word( srange("[A-Z_]") )

    A Word may also be constructed with any of the following optional parameters:

    • min - indicating a minimum length of matching characters
    • max - indicating a maximum length of matching characters
    • exact - indicating an exact length of matching characters

    If exact is specified, it will override any values for min or max.

    New in 1.5.6 - Sometimes you want to define a word using all characters in a range except for one or two of them; you can do this with the new excludeChars argument. This is helpful if you want to define a word with all printables except for a single delimiter character, such as '.'. Previously, you would have to create a custom string to pass to Word. With this change, you can just create Word(printables, excludeChars='.').

  • CharsNotIn - similar to Word, but matches characters not in the given constructor string (accepts only one string for both initial and body characters); also supports min, max, and exact optional parameters.

  • Regex - a powerful construct, that accepts a regular expression to be matched at the current parse position; accepts an optional flags parameter, corresponding to the flags parameter in the re.compile method; if the expression includes named sub-fields, they will be represented in the returned ParseResults

  • QuotedString - supports the definition of custom quoted string formats, in addition to pyparsing's built-in dblQuotedString and sglQuotedString. QuotedString allows you to specify the following parameters:

    • quoteChar - string of one or more characters defining the quote delimiting string
    • escChar - character to escape quotes, typically backslash (default=None)
    • escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=None)
    • multiline - boolean indicating whether quotes can span multiple lines (default=False)
    • unquoteResults - boolean indicating whether the matched text should be unquoted (default=True)
    • endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=None => same as quoteChar)

  • SkipTo - skips ahead in the input string, accepting any characters up to the specified pattern; may be constructed with the following optional parameters:

    • include - if set to true, also consumes the match expression (default is False)
    • ignore - allows the user to specify patterns to not be matched, to prevent false matches
    • failOn - if a literal string or expression is given for this argument, it defines an expression that should cause the SkipTo expression to fail, and not skip over that expression
  • White - also similar to Word, but matches whitespace characters. Not usually needed, as whitespace is implicitly ignored by pyparsing. However, some grammars are whitespace-sensitive, such as those that use leading tabs or spaces to indicating grouping or hierarchy. (If matching on tab characters, be sure to call parseWithTabs on the top-level parse element.)
  • Empty - a null expression, requiring no characters - will always match; useful for debugging and for specialized grammars
  • NoMatch - opposite of Empty, will never match; useful for debugging and for specialized grammars

2.3   Expression subclasses

  • And - construct with a list of ParserElements, all of which must match for And to match; can also be created using the '+' operator; multiple expressions can be Anded together using the '*' operator as in:

    ipAddress = Word(nums) + ('.'+Word(nums))*3

    A tuple can be used as the multiplier, indicating a min/max:

    usPhoneNumber = Word(nums) + ('-'+Word(nums))*(1,2)

    A special form of And is created if the '-' operator is used instead of the '+' operator. In the ipAddress example above, if no trailing '.' and Word(nums) are found after matching the initial Word(nums), then pyparsing will back up in the grammar and try other alternatives to ipAddress. However, if ipAddress is defined as:

    strictIpAddress = Word(nums) - ('.'+Word(nums))*3

    then no backing up is done. If the first Word(nums) of strictIpAddress is matched, then any mismatch after that will raise a ParseSyntaxException, which will halt the parsing process immediately. By careful use of the '-' operator, grammars can provide meaningful error messages close to the location where the incoming text does not match the specified grammar.

  • Or - construct with a list of ParserElements, any of which must match for Or to match; if more than one expression matches, the expression that makes the longest match will be used; can also be created using the '^' operator

  • MatchFirst - construct with a list of ParserElements, any of which must match for MatchFirst to match; matching is done left-to-right, taking the first expression that matches; can also be created using the '|' operator

  • Each - similar to And, in that all of the provided expressions must match; however, Each permits matching to be done in any order; can also be created using the '&' operator

  • Optional - construct with a ParserElement, but this element is not required to match; can be constructed with an optional default argument, containing a default string or object to be supplied if the given optional parse element is not found in the input string; parse action will only be called if a match is found, or if a default is specified

  • ZeroOrMore - similar to Optional, but can be repeated

  • OneOrMore - similar to ZeroOrMore, but at least one match must be present

  • FollowedBy - a lookahead expression, requires matching of the given expressions, but does not advance the parsing position within the input string

  • NotAny - a negative lookahead expression, prevents matching of named expressions, does not advance the parsing position within the input string; can also be created using the unary '~' operator

2.4   Expression operators

  • ~ - creates NotAny using the expression after the operator
  • + - creates And using the expressions before and after the operator
  • | - creates MatchFirst (first left-to-right match) using the expressions before and after the operator
  • ^ - creates Or (longest match) using the expressions before and after the operator
  • & - creates Each using the expressions before and after the operator
  • * - creates And by multiplying the expression by the integer operand; if expression is multiplied by a 2-tuple, creates an And of (min,max) expressions (similar to "{min,max}" form in regular expressions); if min is None, intepret as (0,max); if max is None, interpret as expr*min + ZeroOrMore(expr)
  • - - like + but with no backup and retry of alternatives
  • * - repetition of expression
  • == - matching expression to string; returns True if the string matches the given expression
  • <<= - inserts the expression following the operator as the body of the Forward expression before the operator (formerly <<, which is now deprecated)

2.5   Positional subclasses

  • StringStart - matches beginning of the text
  • StringEnd - matches the end of the text
  • LineStart - matches beginning of a line (lines delimited by \n characters)
  • LineEnd - matches the end of a line
  • WordStart - matches a leading word boundary
  • WordEnd - matches a trailing word boundary

2.6   Converter subclasses

  • Upcase - converts matched tokens to uppercase (deprecated - use upcaseTokens parse action instead)
  • Combine - joins all matched tokens into a single string, using specified joinString (default joinString=""); expects all matching tokens to be adjacent, with no intervening whitespace (can be overridden by specifying adjacent=False in constructor)
  • Suppress - clears matched tokens; useful to keep returned results from being cluttered with required but uninteresting tokens (such as list delimiters)

2.7   Special subclasses

  • Group - causes the matched tokens to be enclosed in a list; useful in repeated elements like ZeroOrMore and OneOrMore to break up matched tokens into groups for each repeated pattern
  • Dict - like Group, but also constructs a dictionary, using the [0]'th elements of all enclosed token lists as the keys, and each token list as the value
  • SkipTo - catch-all matching expression that accepts all characters up until the given pattern is found to match; useful for specifying incomplete grammars
  • Forward - placeholder token used to define recursive token patterns; when defining the actual expression later in the program, insert it into the Forward object using the <<= operator (see fourFn.py for an example).

2.8   Other classes

  • ParseResults - class used to contain and manage the lists of tokens created from parsing the input using the user-defined parse expression. ParseResults can be accessed in a number of ways:

    • as a list
      • total list of elements can be found using len()
      • individual elements can be found using [0], [1], [-1], etc.
      • elements can be deleted using del
      • the -1th element can be extracted and removed in a single operation using pop(), or any element can be extracted and removed using pop(n)
    • as a dictionary
      • if setResultsName() is used to name elements within the overall parse expression, then these fields can be referenced as dictionary elements or as attributes
      • the Dict class generates dictionary entries using the data of the input text - in addition to ParseResults listed as [ [ a1, b1, c1, ...], [ a2, b2, c2, ...]  ] it also acts as a dictionary with entries defined as { a1 : [ b1, c1, ... ] }, { a2 : [ b2, c2, ... ] }; this is especially useful when processing tabular data where the first column contains a key value for that line of data
      • list elements that are deleted using del will still be accessible by their dictionary keys
      • supports get(), items() and keys() methods, similar to a dictionary
      • a keyed item can be extracted and removed using pop(key). Here key must be non-numeric (such as a string), in order to use dict extraction instead of list extraction.
      • new named elements can be added (in a parse action, for instance), using the same syntax as adding an item to a dict (parseResults["X"]="new item"); named elements can be removed using del parseResults["X"]
    • as a nested list
      • results returned from the Group class are encapsulated within their own list structure, so that the tokens can be handled as a hierarchical tree

    ParseResults can also be converted to an ordinary list of strings by calling asList(). Note that this will strip the results of any field names that have been defined for any embedded parse elements. (The pprint module is especially good at printing out the nested contents given by asList().)

    Finally, ParseResults can be converted to an XML string by calling asXML(). Where possible, results will be tagged using the results names defined for the respective ParseExpressions. asXML() takes two optional arguments:

    • doctagname - for ParseResults that do not have a defined name, this argument will wrap the resulting XML in a set of opening and closing tags <doctagname> and </doctagname>.
    • namedItemsOnly (default=False) - flag to indicate if the generated XML should skip items that do not have defined names. If a nested group item is named, then all embedded items will be included, whether they have names or not.

2.9   Exception classes and Troubleshooting

  • ParseException - exception returned when a grammar parse fails; ParseExceptions have attributes loc, msg, line, lineno, and column; to view the text line and location where the reported ParseException occurs, use:

    except ParseException, err:
    print err.line
    print " "*(err.column-1) + "^"
    print err

  • RecursiveGrammarException - exception returned by validate() if the grammar contains a recursive infinite loop, such as:

    badGrammar = Forward()
goodToken = Literal("A")
badGrammar <<= Optional(goodToken) + badGrammar

  • ParseFatalException - exception that parse actions can raise to stop parsing immediately. Should be used when a semantic error is found in the input text, such as a mismatched XML tag.

  • ParseSyntaxException - subclass of ParseFatalException raised when a syntax error is found, based on the use of the '-' operator when defining a sequence of expressions in an And expression.

You can also get some insights into the parsing logic using diagnostic parse actions, and setDebug(), or test the matching of expression fragments by testing them using scanString().

3   Miscellaneous attributes and methods

3.1   Helper methods

  • delimitedList( expr, delim=',') - convenience function for matching one or more occurrences of expr, separated by delim. By default, the delimiters are suppressed, so the returned results contain only the separate list elements. Can optionally specify combine=True, indicating that the expressions and delimiters should be returned as one combined value (useful for scoped variables, such as "a.b.c", or "a::b::c", or paths such as "a/b/c").

  • countedArray( expr ) - convenience function for a pattern where an list of instances of the given expression are preceded by an integer giving the count of elements in the list. Returns an expression that parses the leading integer, reads exactly that many expressions, and returns the array of expressions in the parse results - the leading integer is suppressed from the results (although it is easily reconstructed by using len on the returned array).

  • oneOf( string, caseless=False ) - convenience function for quickly declaring an alternative set of Literal tokens, by splitting the given string on whitespace boundaries. The tokens are sorted so that longer matches are attempted first; this ensures that a short token does not mask a longer one that starts with the same characters. If caseless=True, will create an alternative set of CaselessLiteral tokens.

  • dictOf( key, value ) - convenience function for quickly declaring a dictionary pattern of Dict( ZeroOrMore( Group( key + value ) ) ).

  • makeHTMLTags( tagName ) and makeXMLTags( tagName ) - convenience functions to create definitions of opening and closing tag expressions. Returns a pair of expressions, for the corresponding <tag> and </tag> strings. Includes support for attributes in the opening tag, such as <tag attr1="abc"> - attributes are returned as keyed tokens in the returned ParseResults. makeHTMLTags is less restrictive than makeXMLTags, especially with respect to case sensitivity.

  • infixNotation(baseOperand, operatorList) - (formerly named operatorPrecedence) convenience function to define a grammar for parsing infix notation expressions with a hierarchical precedence of operators. To use the infixNotation helper:

    1. Define the base "atom" operand term of the grammar. For this simple grammar, the smallest operand is either and integer or a variable. This will be the first argument to the infixNotation method.
    2. Define a list of tuples for each level of operator precendence. Each tuple is of the form (opExpr, numTerms, rightLeftAssoc, parseAction), where:
      • opExpr is the pyparsing expression for the operator; may also be a string, which will be converted to a Literal; if None, indicates an empty operator, such as the implied multiplication operation between 'm' and 'x' in "y = mx + b". If numTerms parameter is 3, this must be a 2-tuple containing the 2 delimiting operators.
      • numTerms is the number of terms for this operator (must be 1,2, or 3)
      • rightLeftAssoc is the indicator whether the operator is right or left associative, using the pyparsing-defined constants opAssoc.RIGHT and opAssoc.LEFT.
      • parseAction is the parse action to be associated with expressions matching this operator expression (the parse action tuple member may be omitted)
    3. Call infixNotation passing the operand expression and the operator precedence list, and save the returned value as the generated pyparsing expression. You can then use this expression to parse input strings, or incorporate it into a larger, more complex grammar.

  • matchPreviousLiteral and matchPreviousExpr - function to define and expression that matches the same content as was parsed in a previous parse expression. For instance:

    first = Word(nums)
matchExpr = first + ":" + matchPreviousLiteral(first)

    will match "1:1", but not "1:2". Since this matches at the literal level, this will also match the leading "1:1" in "1:10".

    In contrast:

    first = Word(nums)
matchExpr = first + ":" + matchPreviousExpr(first)

    will not match the leading "1:1" in "1:10"; the expressions are evaluated first, and then compared, so "1" is compared with "10".

  • nestedExpr(opener, closer, content=None, ignoreExpr=quotedString) - method for defining nested lists enclosed in opening and closing delimiters.

    • opener - opening character for a nested list (default="("); can also be a pyparsing expression
    • closer - closing character for a nested list (default=")"); can also be a pyparsing expression
    • content - expression for items within the nested lists (default=None)
    • ignoreExpr - expression for ignoring opening and closing delimiters (default=quotedString)

    If an expression is not provided for the content argument, the nested expression will capture all whitespace-delimited content between delimiters as a list of separate values.

    Use the ignoreExpr argument to define expressions that may contain opening or closing characters that should not be treated as opening or closing characters for nesting, such as quotedString or a comment expression. Specify multiple expressions using an Or or MatchFirst. The default is quotedString, but if no expressions are to be ignored, then pass None for this argument.

  • indentedBlock( statementExpr, indentationStackVar, indent=True) - function to define an indented block of statements, similar to indentation-based blocking in Python source code:

    • statementExpr - the expression defining a statement that will be found in the indented block; a valid indentedBlock must contain at least 1 matching statementExpr
    • indentationStackVar - a Python list variable; this variable should be common to all indentedBlock expressions defined within the same grammar, and should be reinitialized to [1] each time the grammar is to be used
    • indent - a boolean flag indicating whether the expressions within the block must be indented from the current parse location; if using indentedBlock to define the left-most statements (all starting in column 1), set indent to False

  • originalTextFor( expr ) - helper function to preserve the originally parsed text, regardless of any token processing or conversion done by the contained expression. For instance, the following expression:

    fullName = Word(alphas) + Word(alphas)

    will return the parse of "John Smith" as ['John', 'Smith']. In some applications, the actual name as it was given in the input string is what is desired. To do this, use originalTextFor:

    fullName = originalTextFor(Word(alphas) + Word(alphas))

  • ungroup( expr ) - function to "ungroup" returned tokens; useful to undo the default behavior of And to always group the returned tokens, even if there is only one in the list. (New in 1.5.6)

  • lineno( loc, string ) - function to give the line number of the location within the string; the first line is line 1, newlines start new rows

  • col( loc, string ) - function to give the column number of the location within the string; the first column is column 1, newlines reset the column number to 1

  • line( loc, string ) - function to retrieve the line of text representing lineno( loc, string ); useful when printing out diagnostic messages for exceptions

  • srange( rangeSpec ) - function to define a string of characters, given a string of the form used by regexp string ranges, such as "[0-9]" for all numeric digits, "[A-Z_]" for uppercase characters plus underscore, and so on (note that rangeSpec does not include support for generic regular expressions, just string range specs)

  • getTokensEndLoc() - function to call from within a parse action to get the ending location for the matched tokens

  • traceParseAction(fn) - decorator function to debug parse actions. Lists each call, called arguments, and return value or exception

3.2   Helper parse actions

  • removeQuotes - removes the first and last characters of a quoted string; useful to remove the delimiting quotes from quoted strings

  • replaceWith(replString) - returns a parse action that simply returns the replString; useful when using transformString, or converting HTML entities, as in:

    nbsp = Literal("&nbsp;").setParseAction( replaceWith("<BLANK>") )

  • keepOriginalText- (deprecated, use originalTextFor instead) restores any internal whitespace or suppressed text within the tokens for a matched parse expression. This is especially useful when defining expressions for scanString or transformString applications.

  • withAttribute( *args, **kwargs ) - helper to create a validating parse action to be used with start tags created with makeXMLTags or makeHTMLTags. Use withAttribute to qualify a starting tag with a required attribute value, to avoid false matches on common tags such as <TD> or <DIV>.

    withAttribute can be called with:

    • keyword arguments, as in (class="Customer",align="right"), or
    • a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") )

    An attribute can be specified to have the special value withAttribute.ANY_VALUE, which will match any value - use this to ensure that an attribute is present but any attribute value is acceptable.

  • downcaseTokens - converts all matched tokens to lowercase

  • upcaseTokens - converts all matched tokens to uppercase

  • matchOnlyAtCol( columnNumber ) - a parse action that verifies that an expression was matched at a particular column, raising a ParseException if matching at a different column number; useful when parsing tabular data

3.3   Common string and token constants

  • alphas - same as string.letters

  • nums - same as string.digits

  • alphanums - a string containing alphas + nums

  • alphas8bit - a string containing alphabetic 8-bit characters:

    ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ

  • printables - same as string.printable, minus the space (' ') character

  • empty - a global Empty(); will always match

  • sglQuotedString - a string of characters enclosed in 's; may include whitespace, but not newlines

  • dblQuotedString - a string of characters enclosed in "s; may include whitespace, but not newlines

  • quotedString - sglQuotedString | dblQuotedString

  • cStyleComment - a comment block delimited by '/*' and '*/' sequences; can span multiple lines, but does not support nesting of comments

  • htmlComment - a comment block delimited by '<!--' and '-->' sequences; can span multiple lines, but does not support nesting of comments

  • commaSeparatedList - similar to delimitedList, except that the list expressions can be any text value, or a quoted string; quoted strings can safely include commas without incorrectly breaking the string into two tokens

  • restOfLine - all remaining printable characters up to but not including the next newline

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pyparsing Examples

This directory contains a number of Python scripts that can get you started in learning to use pyparsing.

  • greeting.py
    Parse "Hello, World!".

  • greetingInKorean.py ~ submission by June Kim
    Unicode example to parse "Hello, World!" in Korean.

  • greetingInGreek.py ~ submission by ???
    Unicode example to parse "Hello, World!" in Greek.

  • holaMundo.py ~ submission by Marco Alfonso
    "Hello, World!" example translated to Spanish, from Marco Alfonso's blog.

  • chemicalFormulas.py
    Simple example to demonstrate the use of ParseResults returned from parseString(). Parses a chemical formula (such as "H2O" or "C6H5OH"), and walks the returned list of tokens to calculate the molecular weight.

  • wordsToNum.py
    A sample program that reads a number in words (such as "fifteen hundred and sixty four"), and returns the actual number (1564). Also demonstrates some processing of ParseExceptions, including marking where the parse failure was found.

  • pythonGrammarparser.py ~ suggested by JH Stovall
    A sample program that parses the EBNF used in the Python source code to define the Python grammar. From this parser, one can generate Python grammar documentation tools, such as railroad track diagrams. Also demonstrates use of Dict class.

  • commasep.py
    Demonstration of the use of the commaSeparatedList helper. Shows examples of proper handling of commas within quotes, trimming of whitespace around delimited entries, and handling of consecutive commas (null arguments). Includes comparison with simple string.split(',').

  • dictExample.py
    A demonstration of using the Dict class, to parse a table of ASCII tabulated data.

  • dictExample2.py ~ submission by Mike Kelly
    An extended version of dictExample.py, in which Mike Kelly also parses the column headers, and generates a transposed version of the original table!

  • scanExamples.py
    Some examples of using scanString and transformString, as alternative parsing methods to parseString, to do macro substitution, and selection and/or removal of matching strings within a source file.

  • urlExtractor.py
    Another example using scanString, this time to extract all HREF references found on Yahoo!'s home page, and return them as a dictionary.

  • makeHTMLTagExample.py
    A sample program showing sample definitions and applications of HTML tag expressions created using makeHTMLTags helper function. Very useful for scraping data from HTML pages.

  • urlExtractorNew.py
    Another updated version of urlExtractor.py, using the new makeHTMLTags() method.

  • fourFn.py
    A simple algebraic expression parser, that performs +,-,*,/, and ^ arithmetic operations. (With suggestions and bug-fixes graciously offered by Andrea Griffini.)

  • SimpleCalc.py ~ submission by Steven Siew
    An interactive version of fourFn.py, with support for variables.

  • LAParser.py ~ submission by Mike Ellis
    An interactive Linear Algebra Parser, an extension of SimpleCalc.py. Supports linear algebra (LA) notation for vectors, matrices, and scalars, including matrix operations such as inversion and determinants. Converts LA expressions to C code - uses a separate C library for runtime evaluation of results.

  • configParse.py
    A simple alternative to Python's ConfigParse module, demonstrating the use of the Dict class to return nested dictionary access to configuration values.

  • getNTPservers.py
    Yet another scanString example, to read/extract the list of NTP servers from NIST's web site.

  • getNTPserversNew.py
    An updated version of getNTPservers.py, using the new makeHTMLTags() method.

  • httpServerLogParser.py
    Parser for Apache server log files.

  • idlParse.py
    Parser for CORBA IDL files.

  • mozillaCalendarParser.py ~ submission by Petri Savolainen
    Parser for Mozilla calendar (*.ics) files.

  • pgn.py ~ submission by Alberto Santini
    Parser for PGN (Portable Game Notation) files, the standard form for documenting the moves in chess games.

  • simpleSQL.py
    A simple parser that will extract table and column names from SQL SELECT statements..

  • dfmparse.py ~ submission by Dan Griffith
    Parser for Delphi forms.

  • ebnf.py / ebnftest.py ~ submission by Seo Sanghyeon
    An EBNF-compiler that reads EBNF and generates a pyparsing grammar! Including a test that compiles... EBNF itself!

  • searchparser.py ~ submission by Steven Mooij and Rudolph Froger
    An expression parser that parses search strings, with special keyword and expression operations using (), not, and, or, and quoted strings.

  • sparser.py ~ submission by Tim Cera
    A configurable parser module that can be configured with a list of tuples, giving a high-level definition for parsing common sets of water table data files. Tim had to contend with several different styles of data file formats, each with slight variations of its own. Tim created a configurable parser (or "SPECIFIED parser" - hence the name "sparser"), that simply works from a config variable listing the field names and data types, and implicitly, their order in the source data file.

    See mayport_florida_8720220_data_def.txt for an example configuration file.

  • romanNumerals.py
    A Roman numeral generator and parser example, showing the power of parse actions to compile Roman numerals into their integer values.

  • removeLineBreaks.py
    A string transformer that converts text files with hard line-breaks into one with line breaks only between paragraphs. Useful when converting downloads from Project Gutenberg to import to word processing apps that can reformat paragraphs once hard line-breaks are removed, or for loading into your Palm Pilot for portable perusal.

    See Successful Methods of Public Speaking.txt and Successful Methods of Public Speaking(2).txt for a sample before and after (text file courtesy of Project Gutenberg).

  • listAllMatches.py
    An example program showing the utility of the listAllMatches option when specifying results naming.

  • linenoExample.py
    An example program showing how to use the string location to extract line and column numbers, or the source line of text.

  • parseListString.py
    An example program showing a progression of steps, how to parse a string representation of a Python list back into a true list.

  • parsePythonValue.py
    An extension of parseListString.py to parse tuples and dicts, including nested values, returning a Python value of the original type.

  • indentedGrammarExample.py
    An example program showing how to parse a grammar using indentation for grouping, such as is done in Python.

  • simpleArith.py
    An example program showing how to use the new operatorPrecedence helper method to define a 6-function (+, -, *, /, ^, and !) arithmetic expression parser, with unary plus and minus signs.

  • simpleBool.py
    An example program showing how to use the new operatorPrecedence helper method to define a boolean expression parser, with parse actions associated with each operator to "compile" the expression into a data structure that will evaluate the expression's boolean value.

  • simpleWiki.py
    An example program showing how to use transformString to implement a simple Wiki markup parser.

  • sql2dot.py~ submission by EnErGy [CSDX]
    A nice graphing program that generates schema diagrams from SQL table definition statements.

  • htmlStripper.py
    An example implementation of a common application, removing HTML markup tags from an HTML page, leaving just the text content.

  • macroExpansion.py
    An example implementation of a simple preprocessor, that will read embedded macro definitions and replace macro references with the defined substitution string.

  • sexpParser.py
    A parser that uses a recursive grammar to parse S-expressions.

  • nested.py
    An example using nestedExpr, a helper method to simplify definitions of expressions of nested lists.

  • withAttribute.py
    An example using withAttribute, a helper method to define parse actions to validate matched HTML tags using additional attributes. Especially helpful for matching common tags such as <DIV> and <TD>.

  • stackish.py
    A parser for the data representation format, Stackish.

  • builtin_parse_action_demo.py
    New in version 1.5.7
    Demonstration of using builtins (min, max, sum, len, etc.) as parse actions.

  • antlr_grammar.py~ submission by Luca DellOlio
    New in version 1.5.7
    Pyparsing example parsing ANTLR .a files and generating a working pyparsing parser.

  • shapes.py
    New in version 1.5.7
    Parse actions example simple shape definition syntax, and returning the matched tokens as domain objects instead of just strings.

  • datetimeParseActions.py
    New in version 1.5.7
    Parse actions example showing a parse action returning a datetime object instead of string tokens, and doing validation of the tokens, raising a ParseException if the given YYYY/MM/DD string does not represent a valid date.

  • position.py
    New in version 1.5.7
    Demonstration of a couple of different ways to capture the location a particular expression was found within the overall input string.

pyparsing-2.1.10/examples/AcManForm.dfm0000666000000000000000000011434112466013312016054 0ustar 00000000000000object Form1: TForm1 Left = 193 Top = 105 Width = 696 Height = 480 Caption = 'AcManTest' Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'MS Sans Serif' Font.Style = [] OldCreateOrder = False OnCreate = FormCreate PixelsPerInch = 96 TextHeight = 13 object RichEdit1: TRichEdit Left = 0 Top = 107 Width = 688 Height = 346 Align = alClient Lines.Strings = ( 'RichEdit1') TabOrder = 0 end object ActionToolBar1: TActionToolBar Left = 0 Top = 25 Width = 688 Height = 28 ActionManager = ActionManager1 Caption = 'ActionToolBar1' ColorMap.HighlightColor = 14410210 ColorMap.BtnSelectedColor = clBtnFace ColorMap.UnusedColor = 14410210 EdgeBorders = [ebTop, ebBottom] Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'MS Sans Serif' Font.Style = [] ParentFont = False ParentShowHint = False ShowHint = True Spacing = 0 end object ActionMainMenuBar1: TActionMainMenuBar Left = 0 Top = 0 Width = 688 Height = 25 UseSystemFont = False ActionManager = ActionManager1 AnimationStyle = asSlide Caption = 'ActionMainMenuBar1' ColorMap.HighlightColor = 14410210 ColorMap.BtnSelectedColor = clBtnFace ColorMap.UnusedColor = 14410210 EdgeBorders = [ebTop, ebBottom] EdgeOuter = esNone Font.Charset = ANSI_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] ParentShowHint = False ShowHint = True Spacing = 0 end object ActionToolBar2: TActionToolBar Left = 0 Top = 53 Width = 688 Height = 28 ActionManager = ActionManager1 Caption = 'ActionToolBar2' ColorMap.HighlightColor = 14410210 ColorMap.BtnSelectedColor = clBtnFace ColorMap.UnusedColor = 14410210 EdgeBorders = [ebTop, ebBottom] Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'MS Sans Serif' Font.Style = [] ParentFont = False ParentShowHint = False ShowHint = True Spacing = 0 end object ActionToolBar3: TActionToolBar Left = 0 Top = 81 Width = 688 Height = 26 ActionManager = ActionManager1 Caption = 'ActionToolBar3' ColorMap.HighlightColor = 14410210 ColorMap.BtnSelectedColor = clBtnFace ColorMap.UnusedColor = 14410210 Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'MS Sans Serif' Font.Style = [] ParentFont = False Spacing = 0 end object ActionManager1: TActionManager FileName = 'settings' ActionBars.SessionCount = 4 ActionBars = < item Items = < item Action = EditUndo1 ImageIndex = 3 ShortCut = 16474 end item Action = EditCut1 ImageIndex = 0 ShortCut = 16472 end item Action = EditCopy1 ImageIndex = 1 ShortCut = 16451 end item Action = EditPaste1 ImageIndex = 2 ShortCut = 16470 end item Action = SearchFind1 ImageIndex = 15 ShortCut = 16454 end item Action = SearchReplace1 ImageIndex = 17 end> ActionBar = ActionToolBar1 AutoSize = False end item Items = < item Items = < item Action = FileOpen1 ImageIndex = 12 ShortCut = 16463 end item Action = FileSaveAs1 ImageIndex = 13 end item Action = FilePrintSetup1 end item Action = FileRun1 end item Action = FileExit1 ImageIndex = 14 LastSession = -1 UsageCount = -1 end> Caption = '&File' end item Items = < item Action = EditCut1 ImageIndex = 0 ShortCut = 16472 end item Action = EditCopy1 ImageIndex = 1 ShortCut = 16451 end item Action = EditPaste1 ImageIndex = 2 ShortCut = 16470 end item Action = EditSelectAll1 ShortCut = 16449 end item Action = EditUndo1 ImageIndex = 3 ShortCut = 16474 end item Action = EditDelete1 ImageIndex = 4 ShortCut = 46 end> Caption = '&Edit' end item Items = < item Action = RichEditBold1 ImageIndex = 5 ShortCut = 16450 end item Action = RichEditItalic1 ImageIndex = 6 ShortCut = 16457 end item Action = RichEditUnderline1 ImageIndex = 7 ShortCut = 16469 end item Action = RichEditStrikeOut1 end item Action = RichEditBullets1 ImageIndex = 8 end item Action = RichEditAlignLeft1 ImageIndex = 9 end item Action = RichEditAlignRight1 ImageIndex = 10 end item Action = RichEditAlignCenter1 ImageIndex = 11 end> Caption = 'F&ormat' end item Items = < item Action = SearchFind1 ImageIndex = 15 ShortCut = 16454 end item Action = SearchFindNext1 ImageIndex = 16 ShortCut = 114 end item Action = SearchReplace1 ImageIndex = 17 end item Action = SearchFindFirst1 end> Caption = '&Search' end item Items = < item Action = CustomizeActionBars1 end> Caption = '&Tools' end item Items = < item Action = HelpContents1 ImageIndex = 18 end> Caption = '&Help' end> ActionBar = ActionMainMenuBar1 AutoSize = False end item Items = < item Action = RichEditBold1 ImageIndex = 5 ShortCut = 16450 end item Action = RichEditItalic1 ImageIndex = 6 ShortCut = 16457 end item Action = RichEditUnderline1 ImageIndex = 7 ShortCut = 16469 end item Action = RichEditBullets1 Caption = 'Bull&ets' ImageIndex = 8 end item Action = RichEditAlignLeft1 ImageIndex = 9 end item Action = RichEditAlignRight1 ImageIndex = 10 end item Action = RichEditAlignCenter1 ImageIndex = 11 end> ActionBar = ActionToolBar2 AutoSize = False end item AutoSize = False end item AutoSize = False end item Items = < item Action = FileSaveAs1 ImageIndex = 13 LastSession = 2 end item Action = CustomizeActionBars1 end item Action = FileExit1 ImageIndex = 14 end item Action = HelpContents1 Caption = 'C&ontents' ImageIndex = 18 end item Action = ActionShowStatus Caption = '&ShowStatus' end> ActionBar = ActionToolBar3 AutoSize = False end> Images = ImageList1 Left = 88 Top = 136 StyleName = 'XP Style' object EditCut1: TEditCut Category = 'Edit' Caption = 'Cu&t' Hint = 'Cut|Cuts the selection and puts it on the Clipboard' ImageIndex = 0 ShortCut = 16472 end object EditCopy1: TEditCopy Category = 'Edit' Caption = '&Copy' Hint = 'Copy|Copies the selection and puts it on the Clipboard' ImageIndex = 1 ShortCut = 16451 end object EditPaste1: TEditPaste Category = 'Edit' Caption = '&Paste' Hint = 'Paste|Inserts Clipboard contents' ImageIndex = 2 ShortCut = 16470 end object EditSelectAll1: TEditSelectAll Category = 'Edit' Caption = 'Select &All' Hint = 'Select All|Selects the entire document' ShortCut = 16449 end object EditUndo1: TEditUndo Category = 'Edit' Caption = '&Undo' Hint = 'Undo|Reverts the last action' ImageIndex = 3 ShortCut = 16474 end object EditDelete1: TEditDelete Category = 'Edit' Caption = '&Delete' Hint = 'Delete|Erases the selection' ImageIndex = 4 ShortCut = 46 end object RichEditBold1: TRichEditBold Category = 'Format' AutoCheck = True Caption = '&Bold' Hint = 'Bold' ImageIndex = 5 ShortCut = 16450 end object RichEditItalic1: TRichEditItalic Category = 'Format' AutoCheck = True Caption = '&Italic' Hint = 'Italic' ImageIndex = 6 ShortCut = 16457 end object RichEditUnderline1: TRichEditUnderline Category = 'Format' AutoCheck = True Caption = '&Underline' Hint = 'Underline' ImageIndex = 7 ShortCut = 16469 end object RichEditStrikeOut1: TRichEditStrikeOut Category = 'Format' AutoCheck = True Caption = '&Strikeout' Hint = 'Strikeout' end object RichEditBullets1: TRichEditBullets Category = 'Format' AutoCheck = True Caption = '&Bullets' Hint = 'Bullets|Inserts a bullet on the current line' ImageIndex = 8 end object RichEditAlignLeft1: TRichEditAlignLeft Category = 'Format' AutoCheck = True Caption = 'Align &Left' Hint = 'Align Left|Aligns text at the left indent' ImageIndex = 9 end object RichEditAlignRight1: TRichEditAlignRight Category = 'Format' AutoCheck = True Caption = 'Align &Right' Hint = 'Align Right|Aligns text at the right indent' ImageIndex = 10 end object RichEditAlignCenter1: TRichEditAlignCenter Category = 'Format' AutoCheck = True Caption = '&Center' Hint = 'Center|Centers text between margins' ImageIndex = 11 end object FileOpen1: TFileOpen Category = 'File' Caption = '&Open...' Hint = 'Open|Opens an existing file' ImageIndex = 12 ShortCut = 16463 end object FileSaveAs1: TFileSaveAs Category = 'File' Caption = 'Save &As...' Hint = 'Save As|Saves the active file with a new name' ImageIndex = 13 end object FilePrintSetup1: TFilePrintSetup Category = 'File' Caption = 'Print Set&up...' Hint = 'Print Setup' end object FileRun1: TFileRun Category = 'File' Browse = False BrowseDlg.Title = 'Run' Caption = '&Run...' Hint = 'Run|Runs an application' Operation = 'open' ShowCmd = scShowNormal end object FileExit1: TFileExit Category = 'File' Caption = 'E&xit' Hint = 'Exit|Quits the application' ImageIndex = 14 end object SearchFind1: TSearchFind Category = 'Search' Caption = '&Find...' Hint = 'Find|Finds the specified text' ImageIndex = 15 ShortCut = 16454 end object SearchFindNext1: TSearchFindNext Category = 'Search' Caption = 'Find &Next' Enabled = False Hint = 'Find Next|Repeats the last find' ImageIndex = 16 ShortCut = 114 end object SearchReplace1: TSearchReplace Category = 'Search' Caption = '&Replace' Hint = 'Replace|Replaces specific text with different text' ImageIndex = 17 end object SearchFindFirst1: TSearchFindFirst Category = 'Search' Caption = 'F&ind First' Hint = 'Find First|Finds the first occurance of specified text' end object CustomizeActionBars1: TCustomizeActionBars Category = 'Tools' Caption = '&Customize' CustomizeDlg.StayOnTop = False end object HelpContents1: THelpContents Category = 'Help' Caption = '&Contents' Enabled = False Hint = 'Help Contents' ImageIndex = 18 end object ActionShowStatus: TAction Category = 'Tools' Caption = 'ShowStatus' OnExecute = ActionShowStatusExecute end end object ImageList1: TImageList Left = 168 Top = 136 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pyparsing-2.1.10/examples/adventureEngine.py0000666000000000000000000005016312466013312017257 0ustar 00000000000000# adventureEngine.py # Copyright 2005-2006, Paul McGuire # # Updated 2012 - latest pyparsing API # from pyparsing import * import random import string def aOrAn( item ): if item.desc[0] in "aeiou": return "an " + item.desc else: return "a " + item.desc def enumerateItems(l): if len(l) == 0: return "nothing" out = [] if len(l) > 1: out.append(', '.join(aOrAn(item) for item in l[:-1])) out.append('and') out.append(aOrAn(l[-1])) return " ".join(out) def enumerateDoors(l): if len(l) == 0: return "" out = [] if len(l) > 1: out.append(', '.join(l[:-1])) out.append("and") out.append(l[-1]) return " ".join(out) class Room(object): def __init__(self, desc): self.desc = desc self.inv = [] self.gameOver = False self.doors = [None,None,None,None] def __getattr__(self,attr): return \ { "n":self.doors[0], "s":self.doors[1], "e":self.doors[2], "w":self.doors[3], }[attr] def enter(self,player): if self.gameOver: player.gameOver = True def addItem(self, it): self.inv.append(it) def removeItem(self,it): self.inv.remove(it) def describe(self): print(self.desc) visibleItems = [ it for it in self.inv if it.isVisible ] if random.random() > 0.5: if len(visibleItems) > 1: is_form = "are" else: is_form = "is" print("There %s %s here." % (is_form, enumerateItems(visibleItems))) else: print("You see %s." % (enumerateItems(visibleItems))) class Exit(Room): def __init__(self): super(Exit,self).__init__("") def enter(self,player): player.gameOver = True class Item(object): items = {} def __init__(self, desc): self.desc = desc self.isDeadly = False self.isFragile = False self.isBroken = False self.isTakeable = True self.isVisible = True self.isOpenable = False self.useAction = None self.usableConditionTest = None self.cantTakeMessage = "You can't take that!" Item.items[desc] = self def __str__(self): return self.desc def breakItem(self): if not self.isBroken: print("") self.desc = "broken " + self.desc self.isBroken = True def isUsable(self, player, target): if self.usableConditionTest: return self.usableConditionTest( player, target ) else: return False def useItem(self, player, target): if self.useAction: self.useAction(player, self, target) class OpenableItem(Item): def __init__(self, desc, contents=None): super(OpenableItem,self).__init__(desc) self.isOpenable = True self.isOpened = False if contents is not None: if isinstance(contents, Item): self.contents = [contents,] else: self.contents = contents else: self.contents = [] def openItem(self, player): if not self.isOpened: self.isOpened = not self.isOpened if self.contents is not None: for item in self.contents: player.room.addItem( item ) self.contents = [] self.desc = "open " + self.desc def closeItem(self, player): if self.isOpened: self.isOpened = not self.isOpened if self.desc.startswith("open "): self.desc = self.desc[5:] class Command(object): "Base class for commands" def __init__(self, verb, verbProg): self.verb = verb self.verbProg = verbProg @staticmethod def helpDescription(): return "" def _doCommand(self, player): pass def __call__(self, player ): print(self.verbProg.capitalize()+"...") self._doCommand(player) class MoveCommand(Command): def __init__(self, quals): super(MoveCommand,self).__init__("MOVE", "moving") self.direction = quals.direction[0] @staticmethod def helpDescription(): return """MOVE or GO - go NORTH, SOUTH, EAST, or WEST (can abbreviate as 'GO N' and 'GO W', or even just 'E' and 'S')""" def _doCommand(self, player): rm = player.room nextRoom = rm.doors[ { "N":0, "S":1, "E":2, "W":3, }[self.direction] ] if nextRoom: player.moveTo( nextRoom ) else: print("Can't go that way.") class TakeCommand(Command): def __init__(self, quals): super(TakeCommand,self).__init__("TAKE", "taking") self.subject = quals.item @staticmethod def helpDescription(): return "TAKE or PICKUP or PICK UP - pick up an object (but some are deadly)" def _doCommand(self, player): rm = player.room subj = Item.items[self.subject] if subj in rm.inv and subj.isVisible: if subj.isTakeable: rm.removeItem(subj) player.take(subj) else: print(subj.cantTakeMessage) else: print("There is no %s here." % subj) class DropCommand(Command): def __init__(self, quals): super(DropCommand,self).__init__("DROP", "dropping") self.subject = quals.item @staticmethod def helpDescription(): return "DROP or LEAVE - drop an object (but fragile items may break)" def _doCommand(self, player): rm = player.room subj = Item.items[self.subject] if subj in player.inv: rm.addItem(subj) player.drop(subj) else: print("You don't have %s." % (aOrAn(subj))) class InventoryCommand(Command): def __init__(self, quals): super(InventoryCommand,self).__init__("INV", "taking inventory") @staticmethod def helpDescription(): return "INVENTORY or INV or I - lists what items you have" def _doCommand(self, player): print("You have %s." % enumerateItems( player.inv )) class LookCommand(Command): def __init__(self, quals): super(LookCommand,self).__init__("LOOK", "looking") @staticmethod def helpDescription(): return "LOOK or L - describes the current room and any objects in it" def _doCommand(self, player): player.room.describe() class DoorsCommand(Command): def __init__(self, quals): super(DoorsCommand,self).__init__("DOORS", "looking for doors") @staticmethod def helpDescription(): return "DOORS - display what doors are visible from this room" def _doCommand(self, player): rm = player.room numDoors = sum([1 for r in rm.doors if r is not None]) if numDoors == 0: reply = "There are no doors in any direction." else: if numDoors == 1: reply = "There is a door to the " else: reply = "There are doors to the " doorNames = [ {0:"north", 1:"south", 2:"east", 3:"west"}[i] for i,d in enumerate(rm.doors) if d is not None ] #~ print doorNames reply += enumerateDoors( doorNames ) reply += "." print(reply) class UseCommand(Command): def __init__(self, quals): super(UseCommand,self).__init__("USE", "using") self.subject = Item.items[quals.usedObj] if quals.targetObj: self.target = Item.items[quals.targetObj] else: self.target = None @staticmethod def helpDescription(): return "USE or U - use an object, optionally IN or ON another object" def _doCommand(self, player): rm = player.room availItems = rm.inv + player.inv if self.subject in availItems: if self.subject.isUsable( player, self.target ): self.subject.useItem( player, self.target ) else: print("You can't use that here.") else: print("There is no %s here to use." % self.subject) class OpenCommand(Command): def __init__(self, quals): super(OpenCommand,self).__init__("OPEN", "opening") self.subject = Item.items[quals.item] @staticmethod def helpDescription(): return "OPEN or O - open an object" def _doCommand(self, player): rm = player.room availItems = rm.inv+player.inv if self.subject in availItems: if self.subject.isOpenable: if not self.subject.isOpened: self.subject.openItem( player ) else: print("It's already open.") else: print("You can't open that.") else: print("There is no %s here to open." % self.subject) class CloseCommand(Command): def __init__(self, quals): super(CloseCommand,self).__init__("CLOSE", "closing") self.subject = Item.items[quals.item] @staticmethod def helpDescription(): return "CLOSE or CL - close an object" def _doCommand(self, player): rm = player.room availItems = rm.inv+player.inv if self.subject in availItems: if self.subject.isOpenable: if self.subject.isOpened: self.subject.closeItem( player ) else: print("You can't close that, it's not open.") else: print("You can't close that.") else: print("There is no %s here to close." % self.subject) class QuitCommand(Command): def __init__(self, quals): super(QuitCommand,self).__init__("QUIT", "quitting") @staticmethod def helpDescription(): return "QUIT or Q - ends the game" def _doCommand(self, player): print("Ok....") player.gameOver = True class HelpCommand(Command): def __init__(self, quals): super(HelpCommand,self).__init__("HELP", "helping") @staticmethod def helpDescription(): return "HELP or H or ? - displays this help message" def _doCommand(self, player): print("Enter any of the following commands (not case sensitive):") for cmd in [ InventoryCommand, DropCommand, TakeCommand, UseCommand, OpenCommand, CloseCommand, MoveCommand, LookCommand, DoorsCommand, QuitCommand, HelpCommand, ]: print(" - %s" % cmd.helpDescription()) print() class AppParseException(ParseException): pass class Parser(object): def __init__(self): self.bnf = self.makeBNF() def makeBNF(self): invVerb = oneOf("INV INVENTORY I", caseless=True) dropVerb = oneOf("DROP LEAVE", caseless=True) takeVerb = oneOf("TAKE PICKUP", caseless=True) | \ (CaselessLiteral("PICK") + CaselessLiteral("UP") ) moveVerb = oneOf("MOVE GO", caseless=True) | empty useVerb = oneOf("USE U", caseless=True) openVerb = oneOf("OPEN O", caseless=True) closeVerb = oneOf("CLOSE CL", caseless=True) quitVerb = oneOf("QUIT Q", caseless=True) lookVerb = oneOf("LOOK L", caseless=True) doorsVerb = CaselessLiteral("DOORS") helpVerb = oneOf("H HELP ?",caseless=True) itemRef = OneOrMore(Word(alphas)).setParseAction( self.validateItemName ) nDir = oneOf("N NORTH",caseless=True).setParseAction(replaceWith("N")) sDir = oneOf("S SOUTH",caseless=True).setParseAction(replaceWith("S")) eDir = oneOf("E EAST",caseless=True).setParseAction(replaceWith("E")) wDir = oneOf("W WEST",caseless=True).setParseAction(replaceWith("W")) moveDirection = nDir | sDir | eDir | wDir invCommand = invVerb dropCommand = dropVerb + itemRef("item") takeCommand = takeVerb + itemRef("item") useCommand = useVerb + itemRef("usedObj") + \ Optional(oneOf("IN ON",caseless=True)) + \ Optional(itemRef,default=None)("targetObj") openCommand = openVerb + itemRef("item") closeCommand = closeVerb + itemRef("item") moveCommand = moveVerb + moveDirection("direction") quitCommand = quitVerb lookCommand = lookVerb doorsCommand = doorsVerb helpCommand = helpVerb # attach command classes to expressions invCommand.setParseAction(InventoryCommand) dropCommand.setParseAction(DropCommand) takeCommand.setParseAction(TakeCommand) useCommand.setParseAction(UseCommand) openCommand.setParseAction(OpenCommand) closeCommand.setParseAction(CloseCommand) moveCommand.setParseAction(MoveCommand) quitCommand.setParseAction(QuitCommand) lookCommand.setParseAction(LookCommand) doorsCommand.setParseAction(DoorsCommand) helpCommand.setParseAction(HelpCommand) # define parser using all command expressions return ( invCommand | useCommand | openCommand | closeCommand | dropCommand | takeCommand | moveCommand | lookCommand | doorsCommand | helpCommand | quitCommand )("command") + LineEnd() def validateItemName(self,s,l,t): iname = " ".join(t) if iname not in Item.items: raise AppParseException(s,l,"No such item '%s'." % iname) return iname def parseCmd(self, cmdstr): try: ret = self.bnf.parseString(cmdstr) return ret except AppParseException as pe: print(pe.msg) except ParseException as pe: print(random.choice([ "Sorry, I don't understand that.", "Huh?", "Excuse me?", "???", "What?" ] )) class Player(object): def __init__(self, name): self.name = name self.gameOver = False self.inv = [] def moveTo(self, rm): self.room = rm rm.enter(self) if self.gameOver: if rm.desc: rm.describe() print("Game over!") else: rm.describe() def take(self,it): if it.isDeadly: print("Aaaagh!...., the %s killed me!" % it) self.gameOver = True else: self.inv.append(it) def drop(self,it): self.inv.remove(it) if it.isFragile: it.breakItem() def createRooms( rm ): """ create rooms, using multiline string showing map layout string contains symbols for the following: A-Z, a-z indicate rooms, and rooms will be stored in a dictionary by reference letter -, | symbols indicate connection between rooms <, >, ^, . symbols indicate one-way connection between rooms """ # start with empty dictionary of rooms ret = {} # look for room symbols, and initialize dictionary # - exit room is always marked 'Z' for c in rm: if c in string.ascii_letters: if c != "Z": ret[c] = Room(c) else: ret[c] = Exit() # scan through input string looking for connections between rooms rows = rm.split("\n") for row,line in enumerate(rows): for col,c in enumerate(line): if c in string.ascii_letters: room = ret[c] n = None s = None e = None w = None # look in neighboring cells for connection symbols (must take # care to guard that neighboring cells exist before testing # contents) if col > 0 and line[col-1] in "<-": other = line[col-2] w = ret[other] if col < len(line)-1 and line[col+1] in "->": other = line[col+2] e = ret[other] if row > 1 and col < len(rows[row-1]) and rows[row-1][col] in '|^': other = rows[row-2][col] n = ret[other] if row < len(rows)-1 and col < len(rows[row+1]) and rows[row+1][col] in '|.': other = rows[row+2][col] s = ret[other] # set connections to neighboring rooms room.doors=[n,s,e,w] return ret # put items in rooms def putItemInRoom(i,r): if isinstance(r,str): r = rooms[r] r.addItem( Item.items[i] ) def playGame(p,startRoom): # create parser parser = Parser() p.moveTo( startRoom ) while not p.gameOver: cmdstr = input(">> ") cmd = parser.parseCmd(cmdstr) if cmd is not None: cmd.command( p ) print() print("You ended the game with:") for i in p.inv: print(" -", aOrAn(i)) #==================== # start game definition roomMap = """ d-Z | f-c-e . | q'+"'")) | ('u' + Word(hexnums, exact=4)) | Word(printables, exact=1)) LITERAL_CHAR = ESC | ~(Literal("'") | Literal('\\')) + Word(printables, exact=1) CHAR_LITERAL = Suppress("'") + LITERAL_CHAR + Suppress("'") STRING_LITERAL = Suppress("'") + Combine(OneOrMore(LITERAL_CHAR)) + Suppress("'") DOUBLE_QUOTE_STRING_LITERAL = '"' + ZeroOrMore(LITERAL_CHAR) + '"' DOUBLE_ANGLE_STRING_LITERAL = '<<' + ZeroOrMore(Word(printables, exact=1)) + '>>' TOKEN_REF = Word(alphas.upper(), alphanums+'_') RULE_REF = Word(alphas.lower(), alphanums+'_') ACTION_ESC = (Suppress("\\") + Suppress("'")) | Suppress('\\"') | Suppress('\\') + (~(Literal("'") | Literal('"')) + Word(printables, exact=1)) ACTION_CHAR_LITERAL = Suppress("'") + (ACTION_ESC | ~(Literal('\\') | Literal("'")) + Word(printables, exact=1)) + Suppress("'") ACTION_STRING_LITERAL = Suppress('"') + ZeroOrMore(ACTION_ESC | ~(Literal('\\') | Literal('"')) + Word(printables, exact=1)) + Suppress('"') SRC = Suppress('src') + ACTION_STRING_LITERAL("file") + INT("line") id = TOKEN_REF | RULE_REF SL_COMMENT = Suppress('//') + Suppress('$ANTLR') + SRC | ZeroOrMore(~EOL + Word(printables)) + EOL ML_COMMENT = cStyleComment WS = OneOrMore(Suppress(' ') | Suppress('\t') | (Optional(Suppress('\r')) + Literal('\n'))) WS_LOOP = ZeroOrMore(SL_COMMENT | ML_COMMENT) NESTED_ARG_ACTION = Forward() NESTED_ARG_ACTION << Suppress('[') + ZeroOrMore(NESTED_ARG_ACTION | ACTION_STRING_LITERAL | ACTION_CHAR_LITERAL) + Suppress(']') ARG_ACTION = NESTED_ARG_ACTION NESTED_ACTION = Forward() NESTED_ACTION << Suppress('{') + ZeroOrMore(NESTED_ACTION | SL_COMMENT | ML_COMMENT | ACTION_STRING_LITERAL | ACTION_CHAR_LITERAL) + Suppress('}') ACTION = NESTED_ACTION + Optional('?') SCOPE = Suppress('scope') OPTIONS = Suppress('options') + Suppress('{') # + WS_LOOP + Suppress('{') TOKENS = Suppress('tokens') + Suppress('{') # + WS_LOOP + Suppress('{') FRAGMENT = 'fragment'; TREE_BEGIN = Suppress('^(') ROOT = Suppress('^') BANG = Suppress('!') RANGE = Suppress('..') REWRITE = Suppress('->') # General Parser Definitions # Grammar heading optionValue = id | STRING_LITERAL | CHAR_LITERAL | INT | Literal('*').setName("s") option = Group(id("id") + Suppress('=') + optionValue("value"))("option") optionsSpec = OPTIONS + Group(OneOrMore(option + Suppress(';')))("options") + Suppress('}') tokenSpec = Group(TOKEN_REF("token_ref") + (Suppress('=') + (STRING_LITERAL | CHAR_LITERAL)("lit")))("token") + Suppress(';') tokensSpec = TOKENS + Group(OneOrMore(tokenSpec))("tokens") + Suppress('}') attrScope = Suppress('scope') + id + ACTION grammarType = Keyword('lexer') + Keyword('parser') + Keyword('tree') actionScopeName = id | Keyword('lexer')("l") | Keyword('parser')("p") action = Suppress('@') + Optional(actionScopeName + Suppress('::')) + id + ACTION grammarHeading = Optional(ML_COMMENT("ML_COMMENT")) + Optional(grammarType) + Suppress('grammar') + id("grammarName") + Suppress(';') + Optional(optionsSpec) + Optional(tokensSpec) + ZeroOrMore(attrScope) + ZeroOrMore(action) modifier = Keyword('protected') | Keyword('public') | Keyword('private') | Keyword('fragment') ruleAction = Suppress('@') + id + ACTION throwsSpec = Suppress('throws') + delimitedList(id) ruleScopeSpec = (Suppress('scope') + ACTION) | (Suppress('scope') + delimitedList(id) + Suppress(';')) | (Suppress('scope') + ACTION + Suppress('scope') + delimitedList(id) + Suppress(';')) unary_op = oneOf("^ !") notTerminal = CHAR_LITERAL | TOKEN_REF | STRING_LITERAL terminal = (CHAR_LITERAL | TOKEN_REF + Optional(ARG_ACTION) | STRING_LITERAL | '.') + Optional(unary_op) block = Forward() notSet = Suppress('~') + (notTerminal | block) rangeNotPython = CHAR_LITERAL("c1") + RANGE + CHAR_LITERAL("c2") atom = Group(rangeNotPython + Optional(unary_op)("op")) | terminal | (notSet + Optional(unary_op)("op")) | (RULE_REF + Optional(ARG_ACTION("arg")) + Optional(unary_op)("op")) element = Forward() treeSpec = Suppress('^(') + element*(2,) + Suppress(')') ebnfSuffix = oneOf("? * +") ebnf = block + Optional(ebnfSuffix("op") | '=>') elementNoOptionSpec = (id("result_name") + oneOf('= +=')("labelOp") + atom("atom") + Optional(ebnfSuffix)) | (id("result_name") + oneOf('= +=')("labelOp") + block + Optional(ebnfSuffix)) | atom("atom") + Optional(ebnfSuffix) | ebnf | ACTION | (treeSpec + Optional(ebnfSuffix)) # | SEMPRED ( '=>' -> GATED_SEMPRED | -> SEMPRED ) element << Group(elementNoOptionSpec)("element") alternative = Group(Group(OneOrMore(element))("elements")) # Do not ask me why group is needed twice... seems like the xml that you see is not always the real structure? rewrite = Optional(Literal('TODO REWRITE RULES TODO')) block << Suppress('(') + Optional(Optional(optionsSpec("opts")) + Suppress(':')) + Group(alternative('a1') + rewrite + Group(ZeroOrMore(Suppress('|') + alternative('a2') + rewrite))("alternatives"))("block") + Suppress(')') altList = alternative('a1') + rewrite + Group(ZeroOrMore(Suppress('|') + alternative('a2') + rewrite))("alternatives") exceptionHandler = Suppress('catch') + ARG_ACTION + ACTION finallyClause = Suppress('finally') + ACTION exceptionGroup = (OneOrMore(exceptionHandler) + Optional(finallyClause)) | finallyClause ruleHeading = Optional(ML_COMMENT)("ruleComment") + Optional(modifier)("modifier") + id("ruleName") + Optional("!") + Optional(ARG_ACTION("arg")) + Optional(Suppress('returns') + ARG_ACTION("rt")) + Optional(throwsSpec) + Optional(optionsSpec) + Optional(ruleScopeSpec) + ZeroOrMore(ruleAction) rule = Group(ruleHeading + Suppress(':') + altList + Suppress(';') + Optional(exceptionGroup))("rule") grammarDef = grammarHeading + Group(OneOrMore(rule))("rules") def grammar(): return grammarDef def __antlrAlternativesConverter(pyparsingRules, antlrBlock): rule = None if hasattr(antlrBlock, 'alternatives') and antlrBlock.alternatives != '' and len(antlrBlock.alternatives) > 0: alternatives = [] alternatives.append(__antlrAlternativeConverter(pyparsingRules, antlrBlock.a1)) for alternative in antlrBlock.alternatives: alternatives.append(__antlrAlternativeConverter(pyparsingRules, alternative)) rule = MatchFirst(alternatives)("anonymous_or") elif hasattr(antlrBlock, 'a1') and antlrBlock.a1 != '': rule = __antlrAlternativeConverter(pyparsingRules, antlrBlock.a1) else: raise Exception('Not yet implemented') assert rule != None return rule def __antlrAlternativeConverter(pyparsingRules, antlrAlternative): elementList = [] for element in antlrAlternative.elements: rule = None if hasattr(element.atom, 'c1') and element.atom.c1 != '': regex = r'['+str(element.atom.c1[0])+'-'+str(element.atom.c2[0]+']') rule = Regex(regex)("anonymous_regex") elif hasattr(element, 'block') and element.block != '': rule = __antlrAlternativesConverter(pyparsingRules, element.block) else: ruleRef = element.atom assert ruleRef in pyparsingRules rule = pyparsingRules[element.atom](element.atom) if hasattr(element, 'op') and element.op != '': if element.op == '+': rule = Group(OneOrMore(rule))("anonymous_one_or_more") elif element.op == '*': rule = Group(ZeroOrMore(rule))("anonymous_zero_or_more") elif element.op == '?': rule = Optional(rule) else: raise Exception('rule operator not yet implemented : ' + element.op) rule = rule elementList.append(rule) if len(elementList) > 1: rule = Group(And(elementList))("anonymous_and") else: rule = elementList[0] assert rule != None return rule def __antlrRuleConverter(pyparsingRules, antlrRule): rule = None rule = __antlrAlternativesConverter(pyparsingRules, antlrRule) assert rule != None rule(antlrRule.ruleName) return rule def antlrConverter(antlrGrammarTree): pyparsingRules = {} antlrTokens = {} for antlrToken in antlrGrammarTree.tokens: antlrTokens[antlrToken.token_ref] = antlrToken.lit for antlrTokenName, antlrToken in list(antlrTokens.items()): pyparsingRules[antlrTokenName] = Literal(antlrToken) antlrRules = {} for antlrRule in antlrGrammarTree.rules: antlrRules[antlrRule.ruleName] = antlrRule pyparsingRules[antlrRule.ruleName] = Forward() # antlr is a top down grammar for antlrRuleName, antlrRule in list(antlrRules.items()): pyparsingRule = __antlrRuleConverter(pyparsingRules, antlrRule) assert pyparsingRule != None pyparsingRules[antlrRuleName] << pyparsingRule return pyparsingRules if __name__ == "__main__": text = """grammar SimpleCalc; options { language = Python; } tokens { PLUS = '+' ; MINUS = '-' ; MULT = '*' ; DIV = '/' ; } /*------------------------------------------------------------------ * PARSER RULES *------------------------------------------------------------------*/ expr : term ( ( PLUS | MINUS ) term )* ; term : factor ( ( MULT | DIV ) factor )* ; factor : NUMBER ; /*------------------------------------------------------------------ * LEXER RULES *------------------------------------------------------------------*/ NUMBER : (DIGIT)+ ; /* WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ; */ fragment DIGIT : '0'..'9' ; """ grammar().validate() antlrGrammarTree = grammar().parseString(text) print(antlrGrammarTree.asXML("antlrGrammarTree")) pyparsingRules = antlrConverter(antlrGrammarTree) pyparsingRule = pyparsingRules["expr"] pyparsingTree = pyparsingRule.parseString("2 - 5 * 42 + 7 / 25") print(pyparsingTree.asXML("pyparsingTree")) pyparsing-2.1.10/examples/antlr_grammar_tests.py0000666000000000000000000000476012752444655020226 0ustar 00000000000000''' Created on 4 sept. 2010 @author: luca Submitted by Luca DallOlio, September, 2010 ''' import unittest import antlr_grammar class Test(unittest.TestCase): def testOptionsSpec(self): text = """options { language = Python; }""" antlr_grammar.optionsSpec.parseString(text) #@UndefinedVariable def testTokensSpec(self): text = """tokens { PLUS = '+' ; MINUS = '-' ; MULT = '*' ; DIV = '/' ; }""" antlr_grammar.tokensSpec.parseString(text) #@UndefinedVariable def testBlock(self): text = """( PLUS | MINUS )""" antlr_grammar.block.parseString(text) #@UndefinedVariable def testRule(self): text = """expr : term ( ( PLUS | MINUS ) term )* ;""" antlr_grammar.rule.parseString(text) #@UndefinedVariable def testLexerRule(self): text = """fragment DIGIT : '0'..'9' ;""" antlr_grammar.rule.parseString(text) #@UndefinedVariable def testLexerRule2(self): text = """WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ;""" #antlr_grammar.rule.parseString(text) #@UndefinedVariable def testGrammar(self): text = """grammar SimpleCalc; options { language = Python; } tokens { PLUS = '+' ; MINUS = '-' ; MULT = '*' ; DIV = '/' ; } /*------------------------------------------------------------------ * PARSER RULES *------------------------------------------------------------------*/ expr : term ( ( PLUS | MINUS ) term )* ; term : factor ( ( MULT | DIV ) factor )* ; factor : NUMBER ; /*------------------------------------------------------------------ * LEXER RULES *------------------------------------------------------------------*/ NUMBER : (DIGIT)+ ; /* WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ; */ fragment DIGIT : '0'..'9' ;""" antlrGrammarTree = antlr_grammar.grammarDef.parseString(text) #@UndefinedVariable pyparsingRules = antlr_grammar.antlrConverter(antlrGrammarTree) pyparsingRule = pyparsingRules["expr"] pyparsingTree = pyparsingRule.parseString("2 - 5 * 42 + 7 / 25") self.assertNotEqual(None, pyparsingTree) if __name__ == "__main__": #import sys;sys.argv = ['', 'Test.testOptionsSpec'] unittest.main()pyparsing-2.1.10/examples/apicheck.py0000666000000000000000000000425112752444367015720 0ustar 00000000000000# apicheck.py # A simple source code scanner for finding patterns of the form # [ procname1 $arg1 $arg2 ] # and verifying the number of arguments # # Copyright (c) 2004-2016, Paul McGuire # from pyparsing import * # define punctuation and simple tokens for locating API calls LBRACK,RBRACK,LBRACE,RBRACE = map(Suppress,"[]{}") ident = Word(alphas,alphanums+"_") | QuotedString("{",endQuoteChar="}") arg = "$" + ident # define an API call with a specific number of arguments - using '-' # will ensure that after matching procname, an incorrect number of args will # raise a ParseSyntaxException, which will interrupt the scanString def apiProc(name, numargs): return LBRACK + Keyword(name)("procname") - arg*numargs + RBRACK # create an apiReference, listing all API functions to be scanned for, and # their respective number of arguments. Beginning the overall expression # with FollowedBy allows us to quickly rule out non-api calls while scanning, # since all of the api calls begin with a "[" apiRef = FollowedBy("[") + MatchFirst([ apiProc("procname1", 2), apiProc("procname2", 1), apiProc("procname3", 2), ]) test = """[ procname1 $par1 $par2 ] other code here [ procname1 $par1 $par2 $par3 ] more code here [ procname1 $par1 ] [ procname3 ${arg with spaces} $par2 ]""" # now explicitly iterate through the scanner using next(), so that # we can trap ParseSyntaxException's that would be raised due to # an incorrect number of arguments. If an exception does occur, # then see how we reset the input text and scanner to advance to the # next line of source code api_scanner = apiRef.scanString(test) while 1: try: t,s,e = next(api_scanner) print("found %s on line %d" % (t.procname, lineno(s,test))) except ParseSyntaxException as pe: print("invalid arg count on line", pe.lineno) print(pe.lineno,':',pe.line) # reset api scanner to start after this exception location test = "\n"*(pe.lineno-1)+test[pe.loc+1:] api_scanner = apiRef.scanString(test) except StopIteration: break pyparsing-2.1.10/examples/btpyparse.py0000666000000000000000000001044612752444342016156 0ustar 00000000000000""" Pyparsing parser for BibTeX files A standalone parser using pyparsing. pyparsing has a simple and expressive syntax so the grammar is easy to read and write. Submitted by Matthew Brett, 2010 Simplified BSD license """ from pyparsing import (Regex, Suppress, ZeroOrMore, Group, Optional, Forward, SkipTo, CaselessLiteral, Dict) class Macro(object): """ Class to encapsulate undefined macro references """ def __init__(self, name): self.name = name def __repr__(self): return 'Macro("%s")' % self.name def __eq__(self, other): return self.name == other.name def __ne__(self, other): return self.name != other.name # Character literals LCURLY,RCURLY,LPAREN,RPAREN,QUOTE,COMMA,AT,EQUALS,HASH = map(Suppress,'{}()",@=#') def bracketed(expr): """ Return matcher for `expr` between curly brackets or parentheses """ return (LPAREN + expr + RPAREN) | (LCURLY + expr + RCURLY) # Define parser components for strings (the hard bit) chars_no_curly = Regex(r"[^{}]+") chars_no_curly.leaveWhitespace() chars_no_quotecurly = Regex(r'[^"{}]+') chars_no_quotecurly.leaveWhitespace() # Curly string is some stuff without curlies, or nested curly sequences curly_string = Forward() curly_item = Group(curly_string) | chars_no_curly curly_string << LCURLY + ZeroOrMore(curly_item) + RCURLY # quoted string is either just stuff within quotes, or stuff within quotes, within # which there is nested curliness quoted_item = Group(curly_string) | chars_no_quotecurly quoted_string = QUOTE + ZeroOrMore(quoted_item) + QUOTE # Numbers can just be numbers. Only integers though. number = Regex('[0-9]+') # Basis characters (by exclusion) for variable / field names. The following # list of characters is from the btparse documentation any_name = Regex('[^\s"#%\'(),={}]+') # btparse says, and the test bibs show by experiment, that macro and field names # cannot start with a digit. In fact entry type names cannot start with a digit # either (see tests/bibs). Cite keys can start with a digit not_digname = Regex('[^\d\s"#%\'(),={}][^\s"#%\'(),={}]*') # Comment comments out to end of line comment = (AT + CaselessLiteral('comment') + Regex("[\s{(].*").leaveWhitespace()) # The name types with their digiteyness not_dig_lower = not_digname.copy().setParseAction(lambda t: t[0].lower()) macro_def = not_dig_lower.copy() macro_ref = not_dig_lower.copy().setParseAction(lambda t : Macro(t[0].lower())) field_name = not_dig_lower.copy() # Spaces in names mean they cannot clash with field names entry_type = not_dig_lower('entry_type') cite_key = any_name('cite_key') # Number has to be before macro name string = (number | macro_ref | quoted_string | curly_string) # There can be hash concatenation field_value = string + ZeroOrMore(HASH + string) field_def = Group(field_name + EQUALS + field_value) entry_contents = Dict(ZeroOrMore(field_def + COMMA) + Optional(field_def)) # Entry is surrounded either by parentheses or curlies entry = (AT + entry_type + bracketed(cite_key + COMMA + entry_contents)) # Preamble is a macro-like thing with no name preamble = AT + CaselessLiteral('preamble') + bracketed(field_value) # Macros (aka strings) macro_contents = macro_def + EQUALS + field_value macro = AT + CaselessLiteral('string') + bracketed(macro_contents) # Implicit comments icomment = SkipTo('@').setParseAction(lambda t : t.insert(0, 'icomment')) # entries are last in the list (other than the fallback) because they have # arbitrary start patterns that would match comments, preamble or macro definitions = Group(comment | preamble | macro | entry | icomment) # Start symbol bibfile = ZeroOrMore(definitions) def parse_str(str): return bibfile.parseString(str) if __name__ == '__main__': # Run basic test txt = """ Some introductory text (implicit comment) @ARTICLE{Authors2011, author = {First Author and Second Author and Third Author}, title = {An article about {S}omething}, journal = "Journal of Articles", year = {2011}, volume = {16}, pages = {1140--1141}, number = {2} } """ print('\n\n'.join(defn.dump() for defn in parse_str(txt))) pyparsing-2.1.10/examples/builtin_parse_action_demo.py0000666000000000000000000000156512466013312021337 0ustar 00000000000000# # builtin_parse_action_demo.py # Copyright, 2012 - Paul McGuire # # Simple example of using builtin functions as parse actions. # from pyparsing import * integer = Word(nums).setParseAction(lambda t : int(t[0])) # make an expression that will match a list of ints (which # will be converted to actual ints by the parse action attached # to integer) nums = OneOrMore(integer) test = "2 54 34 2 211 66 43 2 0" print(test) # try each of these builtins as parse actions for fn in (sum, max, min, len, sorted, reversed, list, tuple, set, any, all): fn_name = fn.__name__ if fn is reversed: # reversed returns an iterator, we really want to show the list of items fn = lambda x : list(reversed(x)) # show how each builtin works as a free-standing parse action print(fn_name, nums.setParseAction(fn).parseString(test)) pyparsing-2.1.10/examples/chemicalFormulas.py0000666000000000000000000000377412637153676017442 0ustar 00000000000000# chemicalFormulas.py # # Copyright (c) 2003, Paul McGuire # from pyparsing import Word, Optional, OneOrMore, Group, ParseException, Regex from pyparsing import alphas atomicWeight = { "O" : 15.9994, "H" : 1.00794, "Na" : 22.9897, "Cl" : 35.4527, "C" : 12.0107 } def test( bnf, strg, fn=None ): try: print(strg,"->", bnf.parseString( strg ), end=' ') except ParseException as pe: print(pe) else: if fn != None: print(fn( bnf.parseString( strg ) )) else: print() digits = "0123456789" # Version 1 element = Regex("A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|" "E[rsu]|F[emr]?|G[ade]|H[efgos]?|I[nr]?|Kr?|L[airu]|" "M[dgnot]|N[abdeiop]?|Os?|P[abdmortu]?|R[abefghnu]|" "S[bcegimnr]?|T[abcehilm]|U(u[bhopqst])?|V|W|Xe|Yb?|Z[nr]") element = Word( alphas.upper(), alphas.lower(), max=2) elementRef = Group( element + Optional( Word( digits ), default="1" ) ) formula = OneOrMore( elementRef ) fn = lambda elemList : sum(atomicWeight[elem]*int(qty) for elem,qty in elemList) test( formula, "H2O", fn ) test( formula, "C6H5OH", fn ) test( formula, "NaCl", fn ) print() # Version 2 - access parsed items by field name elementRef = Group( element("symbol") + Optional( Word( digits ), default="1" )("qty") ) formula = OneOrMore( elementRef ) fn = lambda elemList : sum(atomicWeight[elem.symbol]*int(elem.qty) for elem in elemList) test( formula, "H2O", fn ) test( formula, "C6H5OH", fn ) test( formula, "NaCl", fn ) print() # Version 3 - convert integers during parsing process integer = Word( digits ).setParseAction(lambda t:int(t[0])) elementRef = Group( element("symbol") + Optional( integer, default=1 )("qty") ) formula = OneOrMore( elementRef ) fn = lambda elemList : sum(atomicWeight[elem.symbol]*elem.qty for elem in elemList) test( formula, "H2O", fn ) test( formula, "C6H5OH", fn ) test( formula, "NaCl", fn ) pyparsing-2.1.10/examples/cLibHeader.py0000666000000000000000000000144612466013312016116 0ustar 00000000000000# # cLibHeader.py # # A simple parser to extract API doc info from a C header file # # Copyright, 2012 - Paul McGuire # from pyparsing import Word, alphas, alphanums, Combine, oneOf, Optional, delimitedList, Group, Keyword testdata = """ int func1(float *vec, int len, double arg1); int func2(float **arr, float *vec, int len, double arg1, double arg2); """ ident = Word(alphas, alphanums + "_") vartype = Combine( oneOf("float double int char") + Optional(Word("*")), adjacent = False) arglist = delimitedList(Group(vartype("type") + ident("name"))) functionCall = Keyword("int") + ident("name") + "(" + arglist("args") + ")" + ";" for fn,s,e in functionCall.scanString(testdata): print(fn.name) for a in fn.args: print(" - %(name)s (%(type)s)" % a) pyparsing-2.1.10/examples/commasep.py0000666000000000000000000000142712752444271015751 0ustar 00000000000000# commasep.py # # comma-separated list example, to illustrate the advantages of using # the pyparsing commaSeparatedList as opposed to string.split(","): # - leading and trailing whitespace is implicitly trimmed from list elements # - list elements can be quoted strings, which can safely contain commas without breaking # into separate elements # # Copyright (c) 2004-2016, Paul McGuire # from pyparsing import commaSeparatedList testData = [ "a,b,c,100.2,,3", "d, e, j k , m ", "'Hello, World', f, g , , 5.1,x", "John Doe, 123 Main St., Cleveland, Ohio", "Jane Doe, 456 St. James St., Los Angeles , California ", "", ] for line in testData: print(commaSeparatedList.parseString(line)) print(line.split(",")) print() pyparsing-2.1.10/examples/configParse.py0000666000000000000000000000404412466013312016371 0ustar 00000000000000# # configparse.py # # an example of using the parsing module to be able to process a .INI configuration file # # Copyright (c) 2003, Paul McGuire # from pyparsing import \ Literal, Word, ZeroOrMore, Group, Dict, Optional, \ printables, ParseException, restOfLine, empty import pprint inibnf = None def inifile_BNF(): global inibnf if not inibnf: # punctuation lbrack = Literal("[").suppress() rbrack = Literal("]").suppress() equals = Literal("=").suppress() semi = Literal(";") comment = semi + Optional( restOfLine ) nonrbrack = "".join( [ c for c in printables if c != "]" ] ) + " \t" nonequals = "".join( [ c for c in printables if c != "=" ] ) + " \t" sectionDef = lbrack + Word( nonrbrack ) + rbrack keyDef = ~lbrack + Word( nonequals ) + equals + empty + restOfLine # strip any leading or trailing blanks from key def stripKey(tokens): tokens[0] = tokens[0].strip() keyDef.setParseAction(stripKey) # using Dict will allow retrieval of named data fields as attributes of the parsed results inibnf = Dict( ZeroOrMore( Group( sectionDef + Dict( ZeroOrMore( Group( keyDef ) ) ) ) ) ) inibnf.ignore( comment ) return inibnf pp = pprint.PrettyPrinter(2) def test( strng ): print(strng) try: iniFile = open(strng) iniData = "".join( iniFile.readlines() ) bnf = inifile_BNF() tokens = bnf.parseString( iniData ) pp.pprint( tokens.asList() ) except ParseException as err: print(err.line) print(" "*(err.column-1) + "^") print(err) iniFile.close() print() return tokens if __name__ == "__main__": ini = test("setup.ini") print("ini['Startup']['modemid'] =", ini['Startup']['modemid']) print("ini.Startup =", ini.Startup) print("ini.Startup.modemid =", ini.Startup.modemid) pyparsing-2.1.10/examples/cpp_enum_parser.py0000666000000000000000000000247612765031117017327 0ustar 00000000000000# # cpp_enum_parser.py # # Posted by Mark Tolonen on comp.lang.python in August, 2009, # Used with permission. # # Parser that scans through C or C++ code for enum definitions, and # generates corresponding Python constant definitions. # # from pyparsing import * # sample string with enums and other stuff sample = ''' stuff before enum hello { Zero, One, Two, Three, Five=5, Six, Ten=10 }; in the middle enum blah { alpha, beta, gamma = 10 , zeta = 50 }; at the end ''' # syntax we don't want to see in the final parse tree LBRACE,RBRACE,EQ,COMMA = map(Suppress,"{}=,") _enum = Suppress('enum') identifier = Word(alphas,alphanums+'_') integer = Word(nums) enumValue = Group(identifier('name') + Optional(EQ + integer('value'))) enumList = Group(enumValue + ZeroOrMore(COMMA + enumValue)) enum = _enum + identifier('enum') + LBRACE + enumList('names') + RBRACE # find instances of enums ignoring other syntax for item,start,stop in enum.scanString(sample): id = 0 for entry in item.names: if entry.value != '': id = int(entry.value) print('%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)) id += 1 pyparsing-2.1.10/examples/datetimeParseActions.py0000666000000000000000000000366712754067253020270 0ustar 00000000000000# parseActions.py # # A sample program a parser to match a date string of the form "YYYY/MM/DD", # and return it as a datetime, or raise an exception if not a valid date. # # Copyright 2012, Paul T. McGuire # from datetime import datetime from pyparsing import * # define an integer string, and a parse action to convert it # to an integer at parse time integer = Word(nums).setName("integer") def convertToInt(tokens): # no need to test for validity - we can't get here # unless tokens[0] contains all numeric digits return int(tokens[0]) integer.setParseAction(convertToInt) # or can be written as one line as #integer = Word(nums).setParseAction(lambda t: int(t[0])) # define a pattern for a year/month/day date date_expr = integer('year') + '/' + integer('month') + '/' + integer('day') date_expr.ignore(pythonStyleComment) def convertToDatetime(s,loc,tokens): try: # note that the year, month, and day fields were already # converted to ints from strings by the parse action defined # on the integer expression above return datetime(tokens.year, tokens.month, tokens.day).date() except Exception as ve: errmsg = "'%s/%s/%s' is not a valid date, %s" % \ (tokens.year, tokens.month, tokens.day, ve) raise ParseException(s, loc, errmsg) date_expr.setParseAction(convertToDatetime) date_expr.runTests("""\ 2000/1/1 # invalid month 2000/13/1 # 1900 was not a leap year 1900/2/29 # but 2000 was 2000/2/29 """) # if dates conform to ISO8601, use definitions in pyparsing_common date_expr = pyparsing_common.iso8601_date.setParseAction(pyparsing_common.convertToDate()) date_expr.ignore(pythonStyleComment) date_expr.runTests("""\ 2000-01-01 # invalid month 2000-13-01 # 1900 was not a leap year 1900-02-29 # but 2000 was 2000-02-29 """)pyparsing-2.1.10/examples/deltaTime.py0000666000000000000000000001623112751641125016050 0ustar 00000000000000# deltaTime.py # # Parser to convert a conversational time reference such as "in a minute" or # "noon tomorrow" and convert it to a Python datetime. The returned # ParseResults object contains the results name "timeOffset" containing # the timedelta, and "calculatedTime" containing the computed time relative # to datetime.now(). # # Copyright 2010, by Paul McGuire # from datetime import datetime, timedelta from pyparsing import * import calendar __all__ = ["nlTimeExpression"] # string conversion parse actions def convertToTimedelta(toks): unit = toks.timeunit.lower().rstrip("s") td = { 'week' : timedelta(7), 'day' : timedelta(1), 'hour' : timedelta(0,0,0,0,0,1), 'minute' : timedelta(0,0,0,0,1), 'second' : timedelta(0,1), }[unit] if toks.qty: td *= int(toks.qty) if toks.dir: td *= toks.dir toks["timeOffset"] = td def convertToDay(toks): now = datetime.now() if "wkdayRef" in toks: todaynum = now.weekday() daynames = [n.lower() for n in calendar.day_name] nameddaynum = daynames.index(toks.wkdayRef.day.lower()) if toks.wkdayRef.dir > 0: daydiff = (nameddaynum + 7 - todaynum) % 7 else: daydiff = -((todaynum + 7 - nameddaynum) % 7) toks["absTime"] = datetime(now.year, now.month, now.day)+timedelta(daydiff) else: name = toks.name.lower() toks["absTime"] = { "now" : now, "today" : datetime(now.year, now.month, now.day), "yesterday" : datetime(now.year, now.month, now.day)+timedelta(-1), "tomorrow" : datetime(now.year, now.month, now.day)+timedelta(+1), }[name] def convertToAbsTime(toks): now = datetime.now() if "dayRef" in toks: day = toks.dayRef.absTime day = datetime(day.year, day.month, day.day) else: day = datetime(now.year, now.month, now.day) if "timeOfDay" in toks: if isinstance(toks.timeOfDay,str): timeOfDay = { "now" : timedelta(0, (now.hour*60+now.minute)*60+now.second, now.microsecond), "noon" : timedelta(0,0,0,0,0,12), "midnight" : timedelta(), }[toks.timeOfDay] else: hhmmss = toks.timeparts if hhmmss.miltime: hh,mm = hhmmss.miltime ss = 0 else: hh,mm,ss = (hhmmss.HH % 12), hhmmss.MM, hhmmss.SS if not mm: mm = 0 if not ss: ss = 0 if toks.timeOfDay.ampm == 'pm': hh += 12 timeOfDay = timedelta(0, (hh*60+mm)*60+ss, 0) else: timeOfDay = timedelta(0, (now.hour*60+now.minute)*60+now.second, now.microsecond) toks["absTime"] = day + timeOfDay def calculateTime(toks): if toks.absTime: absTime = toks.absTime else: absTime = datetime.now() if toks.timeOffset: absTime += toks.timeOffset toks["calculatedTime"] = absTime # grammar definitions CL = CaselessLiteral today, tomorrow, yesterday, noon, midnight, now = map( CL, "today tomorrow yesterday noon midnight now".split()) plural = lambda s : Combine(CL(s) + Optional(CL("s"))) week, day, hour, minute, second = map( plural, "week day hour minute second".split()) am = CL("am") pm = CL("pm") COLON = Suppress(':') # are these actually operators? in_ = CL("in").setParseAction(replaceWith(1)) from_ = CL("from").setParseAction(replaceWith(1)) before = CL("before").setParseAction(replaceWith(-1)) after = CL("after").setParseAction(replaceWith(1)) ago = CL("ago").setParseAction(replaceWith(-1)) next_ = CL("next").setParseAction(replaceWith(1)) last_ = CL("last").setParseAction(replaceWith(-1)) at_ = CL("at") on_ = CL("on") couple = (Optional(CL("a")) + CL("couple") + Optional(CL("of"))).setParseAction(replaceWith(2)) a_qty = CL("a").setParseAction(replaceWith(1)) integer = Word(nums).setParseAction(lambda t:int(t[0])) int4 = Group(Word(nums,exact=4).setParseAction(lambda t: [int(t[0][:2]),int(t[0][2:])] )) def fill_timefields(t): t[0]['HH'] = t[0][0] t[0]['MM'] = t[0][1] t[0]['ampm'] = ('am','pm')[t[0].HH >= 12] int4.addParseAction(fill_timefields) qty = integer | couple | a_qty dayName = oneOf( list(calendar.day_name) ) dayOffset = (qty("qty") + (week | day)("timeunit")) dayFwdBack = (from_ + now.suppress() | ago)("dir") weekdayRef = (Optional(next_ | last_,1)("dir") + dayName("day")) dayRef = Optional( (dayOffset + (before | after | from_)("dir") ).setParseAction(convertToTimedelta) ) + \ ((yesterday | today | tomorrow)("name")| weekdayRef("wkdayRef")).setParseAction(convertToDay) todayRef = (dayOffset + dayFwdBack).setParseAction(convertToTimedelta) | \ (in_("dir") + qty("qty") + day("timeunit")).setParseAction(convertToTimedelta) dayTimeSpec = dayRef | todayRef dayTimeSpec.setParseAction(calculateTime) relativeTimeUnit = (week | day | hour | minute | second) timespec = Group(ungroup(int4) | integer("HH") + ungroup(Optional(COLON + integer,[0]))("MM") + ungroup(Optional(COLON + integer,[0]))("SS") + (am | pm)("ampm") ) absTimeSpec = ((noon | midnight | now | timespec("timeparts"))("timeOfDay") + Optional(on_) + Optional(dayRef)("dayRef") | dayRef("dayRef") + at_ + (noon | midnight | now | timespec("timeparts"))("timeOfDay")) absTimeSpec.setParseAction(convertToAbsTime,calculateTime) relTimeSpec = qty("qty") + relativeTimeUnit("timeunit") + \ (from_ | before | after)("dir") + \ Optional(at_) + \ absTimeSpec("absTime") | \ qty("qty") + relativeTimeUnit("timeunit") + ago("dir") | \ in_ + qty("qty") + relativeTimeUnit("timeunit") relTimeSpec.setParseAction(convertToTimedelta,calculateTime) nlTimeExpression = (absTimeSpec + Optional(dayTimeSpec) | dayTimeSpec + Optional(Optional(at_) + absTimeSpec) | relTimeSpec + Optional(absTimeSpec)) if __name__ == "__main__": # test grammar tests = """\ today tomorrow yesterday in a couple of days a couple of days from now a couple of days from today in a day 3 days ago 3 days from now a day ago in 2 weeks in 3 days at 5pm now 10 minutes ago 10 minutes from now in 10 minutes in a minute in a couple of minutes 20 seconds ago in 30 seconds 20 seconds before noon 20 seconds before noon tomorrow noon midnight noon tomorrow 6am tomorrow 0800 yesterday 12:15 AM today 3pm 2 days from today a week from today a week from now 3 weeks ago noon next Sunday noon Sunday noon last Sunday 2pm next Sunday next Sunday at 2pm""" print("(relative to %s)" % datetime.now()) nlTimeExpression.runTests(tests) pyparsing-2.1.10/examples/dfmparse.py0000666000000000000000000001555112752444115015746 0ustar 00000000000000""" This module can parse a Delphi Form (dfm) file. The main is used in experimenting (to find which files fail to parse, and where), but isn't useful for anything else. """ __version__ = "1.0" __author__ = "Daniel 'Dang' Griffith " from pyparsing import Literal, CaselessLiteral, Word, delimitedList \ , Optional, Combine, Group, alphas, nums, alphanums, Forward \ , oneOf, sglQuotedString, OneOrMore, ZeroOrMore, CharsNotIn # This converts DFM character constants into Python string (unicode) values. def to_chr(x): """chr(x) if 0 < x < 128 ; unicode(x) if x > 127.""" return 0 < x < 128 and chr(x) or eval("u'\\u%d'" % x ) ################# # BEGIN GRAMMAR ################# COLON = Literal(":").suppress() CONCAT = Literal("+").suppress() EQUALS = Literal("=").suppress() LANGLE = Literal("<").suppress() LBRACE = Literal("[").suppress() LPAREN = Literal("(").suppress() PERIOD = Literal(".").suppress() RANGLE = Literal(">").suppress() RBRACE = Literal("]").suppress() RPAREN = Literal(")").suppress() CATEGORIES = CaselessLiteral("categories").suppress() END = CaselessLiteral("end").suppress() FONT = CaselessLiteral("font").suppress() HINT = CaselessLiteral("hint").suppress() ITEM = CaselessLiteral("item").suppress() OBJECT = CaselessLiteral("object").suppress() attribute_value_pair = Forward() # this is recursed in item_list_entry simple_identifier = Word(alphas, alphanums + "_") identifier = Combine( simple_identifier + ZeroOrMore( Literal(".") + simple_identifier )) object_name = identifier object_type = identifier # Integer and floating point values are converted to Python longs and floats, respectively. int_value = Combine(Optional("-") + Word(nums)).setParseAction(lambda s,l,t: [ int(t[0]) ] ) float_value = Combine(Optional("-") + Optional(Word(nums)) + "." + Word(nums)).setParseAction(lambda s,l,t: [ float(t[0]) ] ) number_value = float_value | int_value # Base16 constants are left in string form, including the surrounding braces. base16_value = Combine(Literal("{") + OneOrMore(Word("0123456789ABCDEFabcdef")) + Literal("}"), adjacent=False) # This is the first part of a hack to convert the various delphi partial sglQuotedStrings # into a single sglQuotedString equivalent. The gist of it is to combine # all sglQuotedStrings (with their surrounding quotes removed (suppressed)) # with sequences of #xyz character constants, with "strings" concatenated # with a '+' sign. unquoted_sglQuotedString = Combine( Literal("'").suppress() + ZeroOrMore( CharsNotIn("'\n\r") ) + Literal("'").suppress() ) # The parse action on this production converts repetitions of constants into a single string. pound_char = Combine( OneOrMore((Literal("#").suppress()+Word(nums) ).setParseAction( lambda s, l, t: to_chr(int(t[0]) )))) # This is the second part of the hack. It combines the various "unquoted" # partial strings into a single one. Then, the parse action puts # a single matched pair of quotes around it. delphi_string = Combine( OneOrMore(CONCAT | pound_char | unquoted_sglQuotedString) , adjacent=False ).setParseAction(lambda s, l, t: "'%s'" % t[0]) string_value = delphi_string | base16_value list_value = LBRACE + Optional(Group(delimitedList(identifier | number_value | string_value))) + RBRACE paren_list_value = LPAREN + ZeroOrMore(identifier | number_value | string_value) + RPAREN item_list_entry = ITEM + ZeroOrMore(attribute_value_pair) + END item_list = LANGLE + ZeroOrMore(item_list_entry) + RANGLE generic_value = identifier value = item_list | number_value | string_value | list_value | paren_list_value | generic_value category_attribute = CATEGORIES + PERIOD + oneOf("strings itemsvisibles visibles", True) event_attribute = oneOf("onactivate onclosequery onclose oncreate ondeactivate onhide onshow", True) font_attribute = FONT + PERIOD + oneOf("charset color height name style", True) hint_attribute = HINT layout_attribute = oneOf("left top width height", True) generic_attribute = identifier attribute = (category_attribute | event_attribute | font_attribute | hint_attribute | layout_attribute | generic_attribute) category_attribute_value_pair = category_attribute + EQUALS + paren_list_value event_attribute_value_pair = event_attribute + EQUALS + value font_attribute_value_pair = font_attribute + EQUALS + value hint_attribute_value_pair = hint_attribute + EQUALS + value layout_attribute_value_pair = layout_attribute + EQUALS + value generic_attribute_value_pair = attribute + EQUALS + value attribute_value_pair << Group( category_attribute_value_pair | event_attribute_value_pair | font_attribute_value_pair | hint_attribute_value_pair | layout_attribute_value_pair | generic_attribute_value_pair ) object_declaration = Group((OBJECT + object_name + COLON + object_type)) object_attributes = Group(ZeroOrMore(attribute_value_pair)) nested_object = Forward() object_definition = object_declaration + object_attributes + ZeroOrMore(nested_object) + END nested_object << Group(object_definition) ################# # END GRAMMAR ################# def printer(s, loc, tok): print(tok, end=' ') return tok def get_filename_list(tf): import sys, glob if tf == None: if len(sys.argv) > 1: tf = sys.argv[1:] else: tf = glob.glob("*.dfm") elif type(tf) == str: tf = [tf] testfiles = [] for arg in tf: testfiles.extend(glob.glob(arg)) return testfiles def main(testfiles=None, action=printer): """testfiles can be None, in which case the command line arguments are used as filenames. testfiles can be a string, in which case that file is parsed. testfiles can be a list. In all cases, the filenames will be globbed. If more than one file is parsed successfully, a dictionary of ParseResults is returned. Otherwise, a simple ParseResults is returned. """ testfiles = get_filename_list(testfiles) print(testfiles) if action: for i in (simple_identifier, value, item_list): i.setParseAction(action) success = 0 failures = [] retval = {} for f in testfiles: try: retval[f] = object_definition.parseFile(f) success += 1 except: failures.append(f) if failures: print('\nfailed while processing %s' % ', '.join(failures)) print('\nsucceeded on %d of %d files' %(success, len(testfiles))) if len(retval) == 1 and len(testfiles) == 1: # if only one file is parsed, return the parseResults directly return retval[list(retval.keys())[0]] # else, return a dictionary of parseResults return retval if __name__ == "__main__": main()pyparsing-2.1.10/examples/dhcpd_leases_parser.py0000666000000000000000000000613412466013312020125 0ustar 00000000000000# # dhcpd_leases_parser.py # # Copyright 2008, Paul McGuire # # Sample parser to parse a dhcpd.leases file to extract leases # and lease attributes # # format ref: http://www.linuxmanpages.com/man5/dhcpd.leases.5.php # sample = r"""\ # All times in this file are in UTC (GMT), not your local timezone. This is # not a bug, so please don't ask about it. There is no portable way to # store leases in the local timezone, so please don't request this as a # feature. If this is inconvenient or confusing to you, we sincerely # apologize. Seriously, though - don't ask. # The format of this file is documented in the dhcpd.leases(5) manual page. # This lease file was written by isc-dhcp-V3.0.4 lease 192.168.0.250 { starts 3 2008/01/23 17:16:41; ends 6 2008/02/02 17:16:41; tstp 6 2008/02/02 17:16:41; binding state free; hardware ethernet 00:17:f2:9b:d8:19; uid "\001\000\027\362\233\330\031"; } lease 192.168.0.198 { starts 1 2008/02/04 13:46:55; ends never; tstp 1 2008/02/04 17:04:14; binding state free; hardware ethernet 00:13:72:d3:3b:98; uid "\001\000\023r\323;\230"; } lease 192.168.0.239 { starts 3 2008/02/06 12:12:03; ends 4 2008/02/07 12:12:03; tstp 4 2008/02/07 12:12:03; binding state free; hardware ethernet 00:1d:09:65:93:26; } """ from pyparsing import * import datetime,time LBRACE,RBRACE,SEMI,QUOTE = map(Suppress,'{};"') ipAddress = Combine(Word(nums) + ('.' + Word(nums))*3) hexint = Word(hexnums,exact=2) macAddress = Combine(hexint + (':'+hexint)*5) hdwType = Word(alphanums) yyyymmdd = Combine((Word(nums,exact=4)|Word(nums,exact=2))+ ('/'+Word(nums,exact=2))*2) hhmmss = Combine(Word(nums,exact=2)+(':'+Word(nums,exact=2))*2) dateRef = oneOf(list("0123456"))("weekday") + yyyymmdd("date") + \ hhmmss("time") def utcToLocalTime(tokens): utctime = datetime.datetime.strptime("%(date)s %(time)s" % tokens, "%Y/%m/%d %H:%M:%S") localtime = utctime-datetime.timedelta(0,time.timezone,0) tokens["utcdate"],tokens["utctime"] = tokens["date"],tokens["time"] tokens["localdate"],tokens["localtime"] = str(localtime).split() del tokens["date"] del tokens["time"] dateRef.setParseAction(utcToLocalTime) startsStmt = "starts" + dateRef + SEMI endsStmt = "ends" + (dateRef | "never") + SEMI tstpStmt = "tstp" + dateRef + SEMI tsfpStmt = "tsfp" + dateRef + SEMI hdwStmt = "hardware" + hdwType("type") + macAddress("mac") + SEMI uidStmt = "uid" + QuotedString('"')("uid") + SEMI bindingStmt = "binding" + Word(alphanums) + Word(alphanums) + SEMI leaseStatement = startsStmt | endsStmt | tstpStmt | tsfpStmt | hdwStmt | \ uidStmt | bindingStmt leaseDef = "lease" + ipAddress("ipaddress") + LBRACE + \ Dict(ZeroOrMore(Group(leaseStatement))) + RBRACE for lease in leaseDef.searchString(sample): print(lease.dump()) print(lease.ipaddress,'->',lease.hardware.mac) print() pyparsing-2.1.10/examples/dictExample.py0000666000000000000000000000311412466013312016365 0ustar 00000000000000# # dictExample.py # # Illustration of using pyparsing's Dict class to process tabular data # # Copyright (c) 2003, Paul McGuire # from pyparsing import Literal, Word, Group, Dict, ZeroOrMore, alphas, nums, delimitedList import pprint testData = """ +-------+------+------+------+------+------+------+------+------+ | | A1 | B1 | C1 | D1 | A2 | B2 | C2 | D2 | +=======+======+======+======+======+======+======+======+======+ | min | 7 | 43 | 7 | 15 | 82 | 98 | 1 | 37 | | max | 11 | 52 | 10 | 17 | 85 | 112 | 4 | 39 | | ave | 9 | 47 | 8 | 16 | 84 | 106 | 3 | 38 | | sdev | 1 | 3 | 1 | 1 | 1 | 3 | 1 | 1 | +-------+------+------+------+------+------+------+------+------+ """ # define grammar for datatable heading = (Literal( "+-------+------+------+------+------+------+------+------+------+") + "| | A1 | B1 | C1 | D1 | A2 | B2 | C2 | D2 |" + "+=======+======+======+======+======+======+======+======+======+").suppress() vert = Literal("|").suppress() number = Word(nums) rowData = Group( vert + Word(alphas) + vert + delimitedList(number,"|") + vert ) trailing = Literal( "+-------+------+------+------+------+------+------+------+------+").suppress() datatable = heading + Dict( ZeroOrMore(rowData) ) + trailing # now parse data and print results data = datatable.parseString(testData) print(data) pprint.pprint(data.asList()) print("data keys=", list(data.keys())) print("data['min']=", data['min']) print("data.max", data.max) pyparsing-2.1.10/examples/dictExample2.py0000666000000000000000000000412012716260110016443 0ustar 00000000000000# # dictExample2.py # # Illustration of using pyparsing's Dict class to process tabular data # Enhanced Dict example, courtesy of Mike Kelly # # Copyright (c) 2004, Paul McGuire # from pyparsing import Literal, Word, Group, Dict, ZeroOrMore, alphas, nums, delimitedList, pyparsing_common import pprint testData = """ +-------+------+------+------+------+------+------+------+------+ | | A1 | B1 | C1 | D1 | A2 | B2 | C2 | D2 | +=======+======+======+======+======+======+======+======+======+ | min | 7 | 43 | 7 | 15 | 82 | 98 | 1 | 37 | | max | 11 | 52 | 10 | 17 | 85 | 112 | 4 | 39 | | ave | 9 | 47 | 8 | 16 | 84 | 106 | 3 | 38 | | sdev | 1 | 3 | 1 | 1 | 1 | 3 | 1 | 1 | +-------+------+------+------+------+------+------+------+------+ """ # define grammar for datatable underline = Word("-=") number = pyparsing_common.integer vert = Literal("|").suppress() rowDelim = ("+" + ZeroOrMore( underline + "+" ) ).suppress() columnHeader = Group(vert + vert + delimitedList(Word(alphas + nums), "|") + vert) heading = rowDelim + columnHeader("columns") + rowDelim rowData = Group( vert + Word(alphas) + vert + delimitedList(number,"|") + vert ) trailing = rowDelim datatable = heading + Dict( ZeroOrMore(rowData) ) + trailing # now parse data and print results data = datatable.parseString(testData) print(data.dump()) print("data keys=", list(data.keys())) print("data['min']=", data['min']) print("sum(data['min']) =", sum(data['min'])) print("data.max =", data.max) print("sum(data.max) =", sum(data.max)) # now print transpose of data table, using column labels read from table header and # values from data lists print() print(" " * 5, end=' ') for i in range(1,len(data)): print("|%5s" % data[i][0], end=' ') print() print(("-" * 6) + ("+------" * (len(data)-1))) for i in range(len(data.columns)): print("%5s" % data.columns[i], end=' ') for j in range(len(data) - 1): print('|%5s' % data[j + 1][i + 1], end=' ') print() pyparsing-2.1.10/examples/ebnf.py0000666000000000000000000001027612753027730015057 0ustar 00000000000000# This module tries to implement ISO 14977 standard with pyparsing. # pyparsing version 1.1 or greater is required. # ISO 14977 standardize The Extended Backus-Naur Form(EBNF) syntax. # You can read a final draft version here: # http://www.cl.cam.ac.uk/~mgk25/iso-ebnf.html # # Submitted 2004 by Seo Sanghyeon # from pyparsing import * all_names = ''' integer meta_identifier terminal_string optional_sequence repeated_sequence grouped_sequence syntactic_primary syntactic_factor syntactic_term single_definition definitions_list syntax_rule syntax '''.split() integer = Word(nums) meta_identifier = Word(alphas, alphanums + '_') terminal_string = Suppress("'") + CharsNotIn("'") + Suppress("'") ^ \ Suppress('"') + CharsNotIn('"') + Suppress('"') definitions_list = Forward() optional_sequence = Suppress('[') + definitions_list + Suppress(']') repeated_sequence = Suppress('{') + definitions_list + Suppress('}') grouped_sequence = Suppress('(') + definitions_list + Suppress(')') syntactic_primary = optional_sequence ^ repeated_sequence ^ \ grouped_sequence ^ meta_identifier ^ terminal_string syntactic_factor = Optional(integer + Suppress('*')) + syntactic_primary syntactic_term = syntactic_factor + Optional(Suppress('-') + syntactic_factor) single_definition = delimitedList(syntactic_term, ',') definitions_list << delimitedList(single_definition, '|') syntax_rule = meta_identifier + Suppress('=') + definitions_list + \ Suppress(';') ebnfComment = ( "(*" + ZeroOrMore( CharsNotIn("*") | ( "*" + ~Literal(")") ) ) + "*)" ).streamline().setName("ebnfComment") syntax = OneOrMore(syntax_rule) syntax.ignore(ebnfComment) def do_integer(str, loc, toks): return int(toks[0]) def do_meta_identifier(str, loc, toks): if toks[0] in symbol_table: return symbol_table[toks[0]] else: forward_count.value += 1 symbol_table[toks[0]] = Forward() return symbol_table[toks[0]] def do_terminal_string(str, loc, toks): return Literal(toks[0]) def do_optional_sequence(str, loc, toks): return Optional(toks[0]) def do_repeated_sequence(str, loc, toks): return ZeroOrMore(toks[0]) def do_grouped_sequence(str, loc, toks): return Group(toks[0]) def do_syntactic_primary(str, loc, toks): return toks[0] def do_syntactic_factor(str, loc, toks): if len(toks) == 2: # integer * syntactic_primary return And([toks[1]] * toks[0]) else: # syntactic_primary return [ toks[0] ] def do_syntactic_term(str, loc, toks): if len(toks) == 2: # syntactic_factor - syntactic_factor return NotAny(toks[1]) + toks[0] else: # syntactic_factor return [ toks[0] ] def do_single_definition(str, loc, toks): toks = toks.asList() if len(toks) > 1: # syntactic_term , syntactic_term , ... return And(toks) else: # syntactic_term return [ toks[0] ] def do_definitions_list(str, loc, toks): toks = toks.asList() if len(toks) > 1: # single_definition | single_definition | ... return Or(toks) else: # single_definition return [ toks[0] ] def do_syntax_rule(str, loc, toks): # meta_identifier = definitions_list ; assert toks[0].expr is None, "Duplicate definition" forward_count.value -= 1 toks[0] << toks[1] return [ toks[0] ] def do_syntax(str, loc, toks): # syntax_rule syntax_rule ... return symbol_table symbol_table = {} class forward_count: pass forward_count.value = 0 for name in all_names: expr = vars()[name] action = vars()['do_' + name] expr.setName(name) expr.setParseAction(action) #~ expr.setDebug() def parse(ebnf, given_table={}): symbol_table.clear() symbol_table.update(given_table) forward_count.value = 0 table = syntax.parseString(ebnf)[0] assert forward_count.value == 0, "Missing definition" for name in table: expr = table[name] expr.setName(name) #~ expr.setDebug() return table pyparsing-2.1.10/examples/ebnftest.py0000666000000000000000000000453212752443161015754 0ustar 00000000000000# # ebnftest.py # # Test script for ebnf.py # # Submitted 2004 by Seo Sanghyeon # print('Importing pyparsing...') from pyparsing import * print('Constructing EBNF parser with pyparsing...') import ebnf grammar = ''' syntax = (syntax_rule), {(syntax_rule)}; syntax_rule = meta_identifier, '=', definitions_list, ';'; definitions_list = single_definition, {'|', single_definition}; single_definition = syntactic_term, {',', syntactic_term}; syntactic_term = syntactic_factor,['-', syntactic_factor]; syntactic_factor = [integer, '*'], syntactic_primary; syntactic_primary = optional_sequence | repeated_sequence | grouped_sequence | meta_identifier | terminal_string; optional_sequence = '[', definitions_list, ']'; repeated_sequence = '{', definitions_list, '}'; grouped_sequence = '(', definitions_list, ')'; (* terminal_string = "'", character - "'", {character - "'"}, "'" | '"', character - '"', {character - '"'}, '"'; meta_identifier = letter, {letter | digit}; integer = digit, {digit}; *) ''' table = {} #~ table['character'] = Word(printables, exact=1) #~ table['letter'] = Word(alphas + '_', exact=1) #~ table['digit'] = Word(nums, exact=1) table['terminal_string'] = sglQuotedString table['meta_identifier'] = Word(alphas+"_", alphas+"_"+nums) table['integer'] = Word(nums) print('Parsing EBNF grammar with EBNF parser...') parsers = ebnf.parse(grammar, table) ebnf_parser = parsers['syntax'] commentcharcount = 0 commentlocs = set() def tallyCommentChars(s,l,t): global commentcharcount,commentlocs # only count this comment if we haven't seen it before if l not in commentlocs: charCount = ( len(t[0]) - len(list(filter(str.isspace, t[0]))) ) commentcharcount += charCount commentlocs.add(l) return l,t #ordinarily, these lines wouldn't be necessary, but we are doing extra stuff with the comment expression ebnf.ebnfComment.setParseAction( tallyCommentChars ) ebnf_parser.ignore( ebnf.ebnfComment ) print('Parsing EBNF grammar with generated EBNF parser...\n') parsed_chars = ebnf_parser.parseString(grammar) parsed_char_len = len(parsed_chars) print("],\n".join(str( parsed_chars.asList() ).split("],"))) #~ grammar_length = len(grammar) - len(filter(str.isspace, grammar))-commentcharcount #~ assert parsed_char_len == grammar_length print('Ok!') pyparsing-2.1.10/examples/eval_arith.py0000666000000000000000000001565212655554570016276 0ustar 00000000000000# eval_arith.py # # Copyright 2009, 2011 Paul McGuire # # Expansion on the pyparsing example simpleArith.py, to include evaluation # of the parsed tokens. # # Added support for exponentiation, using right-to-left evaluation of # operands # from pyparsing import Word, nums, alphas, Combine, oneOf, \ opAssoc, infixNotation, Literal class EvalConstant(object): "Class to evaluate a parsed constant or variable" vars_ = {} def __init__(self, tokens): self.value = tokens[0] def eval(self): if self.value in EvalConstant.vars_: return EvalConstant.vars_[self.value] else: return float(self.value) class EvalSignOp(object): "Class to evaluate expressions with a leading + or - sign" def __init__(self, tokens): self.sign, self.value = tokens[0] def eval(self): mult = {'+':1, '-':-1}[self.sign] return mult * self.value.eval() def operatorOperands(tokenlist): "generator to extract operators and operands in pairs" it = iter(tokenlist) while 1: try: yield (next(it), next(it)) except StopIteration: break class EvalPowerOp(object): "Class to evaluate multiplication and division expressions" def __init__(self, tokens): self.value = tokens[0] def eval(self): res = self.value[-1].eval() for val in self.value[-3::-2]: res = val.eval()**res return res class EvalMultOp(object): "Class to evaluate multiplication and division expressions" def __init__(self, tokens): self.value = tokens[0] def eval(self): prod = self.value[0].eval() for op,val in operatorOperands(self.value[1:]): if op == '*': prod *= val.eval() if op == '/': prod /= val.eval() return prod class EvalAddOp(object): "Class to evaluate addition and subtraction expressions" def __init__(self, tokens): self.value = tokens[0] def eval(self): sum = self.value[0].eval() for op,val in operatorOperands(self.value[1:]): if op == '+': sum += val.eval() if op == '-': sum -= val.eval() return sum class EvalComparisonOp(object): "Class to evaluate comparison expressions" opMap = { "<" : lambda a,b : a < b, "<=" : lambda a,b : a <= b, ">" : lambda a,b : a > b, ">=" : lambda a,b : a >= b, "!=" : lambda a,b : a != b, "=" : lambda a,b : a == b, "LT" : lambda a,b : a < b, "LE" : lambda a,b : a <= b, "GT" : lambda a,b : a > b, "GE" : lambda a,b : a >= b, "NE" : lambda a,b : a != b, "EQ" : lambda a,b : a == b, "<>" : lambda a,b : a != b, } def __init__(self, tokens): self.value = tokens[0] def eval(self): val1 = self.value[0].eval() for op,val in operatorOperands(self.value[1:]): fn = EvalComparisonOp.opMap[op] val2 = val.eval() if not fn(val1,val2): break val1 = val2 else: return True return False # define the parser integer = Word(nums) real = Combine(Word(nums) + "." + Word(nums)) variable = Word(alphas,exact=1) operand = real | integer | variable signop = oneOf('+ -') multop = oneOf('* /') plusop = oneOf('+ -') expop = Literal('**') # use parse actions to attach EvalXXX constructors to sub-expressions operand.setParseAction(EvalConstant) arith_expr = infixNotation(operand, [ (signop, 1, opAssoc.RIGHT, EvalSignOp), (expop, 2, opAssoc.LEFT, EvalPowerOp), (multop, 2, opAssoc.LEFT, EvalMultOp), (plusop, 2, opAssoc.LEFT, EvalAddOp), ]) comparisonop = oneOf("< <= > >= != = <> LT GT LE GE EQ NE") comp_expr = infixNotation(arith_expr, [ (comparisonop, 2, opAssoc.LEFT, EvalComparisonOp), ]) def main(): # sample expressions posted on comp.lang.python, asking for advice # in safely evaluating them rules=[ '( A - B ) = 0', '(A + B + C + D + E + F + G + H + I) = J', '(A + B + C + D + E + F + G + H) = I', '(A + B + C + D + E + F) = G', '(A + B + C + D + E) = (F + G + H + I + J)', '(A + B + C + D + E) = (F + G + H + I)', '(A + B + C + D + E) = F', '(A + B + C + D) = (E + F + G + H)', '(A + B + C) = (D + E + F)', '(A + B) = (C + D + E + F)', '(A + B) = (C + D)', '(A + B) = (C - D + E - F - G + H + I + J)', '(A + B) = C', '(A + B) = 0', '(A+B+C+D+E) = (F+G+H+I+J)', '(A+B+C+D) = (E+F+G+H)', '(A+B+C+D)=(E+F+G+H)', '(A+B+C)=(D+E+F)', '(A+B)=(C+D)', '(A+B)=C', '(A-B)=C', '(A/(B+C))', '(B/(C+D))', '(G + H) = I', '-0.99 LE ((A+B+C)-(D+E+F+G)) LE 0.99', '-0.99 LE (A-(B+C)) LE 0.99', '-1000.00 LE A LE 0.00', '-5000.00 LE A LE 0.00', 'A < B', 'A < 7000', 'A = -(B)', 'A = C', 'A = 0', 'A GT 0', 'A GT 0.00', 'A GT 7.00', 'A LE B', 'A LT -1000.00', 'A LT -5000', 'A LT 0', 'A=(B+C+D)', 'A=B', 'I = (G + H)', '0.00 LE A LE 4.00', '4.00 LT A LE 7.00', '0.00 LE A LE 4.00 LE E > D', '2**2**(A+3)', ] vars_={'A': 0, 'B': 1.1, 'C': 2.2, 'D': 3.3, 'E': 4.4, 'F': 5.5, 'G': 6.6, 'H':7.7, 'I':8.8, 'J':9.9} # define tests from given rules tests = [] for t in rules: t_orig = t t = t.replace("=","==") t = t.replace("EQ","==") t = t.replace("LE","<=") t = t.replace("GT",">") t = t.replace("LT","<") t = t.replace("GE",">=") t = t.replace("LE","<=") t = t.replace("NE","!=") t = t.replace("<>","!=") tests.append( (t_orig,eval(t,vars_)) ) # copy vars_ to EvalConstant lookup dict EvalConstant.vars_ = vars_ failed = 0 for test,expected in tests: ret = comp_expr.parseString(test)[0] parsedvalue = ret.eval() print(test, expected, parsedvalue) if parsedvalue != expected: print("<<< FAIL") failed += 1 else: print('') print('') if failed: print(failed, "tests FAILED") else: print("all tests PASSED") if __name__=='__main__': main() pyparsing-2.1.10/examples/excelExpr.py0000666000000000000000000000423512755614237016110 0ustar 00000000000000# excelExpr.py # # Copyright 2010, Paul McGuire # # A partial implementation of a parser of Excel formula expressions. # from pyparsing import (CaselessKeyword, Suppress, Word, alphas, alphanums, nums, Optional, Group, oneOf, Forward, Regex, infixNotation, opAssoc, dblQuotedString, delimitedList, Combine, Literal, QuotedString, ParserElement, pyparsing_common) ParserElement.enablePackrat() EQ,LPAR,RPAR,COLON,COMMA = map(Suppress, '=():,') EXCL, DOLLAR = map(Literal,"!$") sheetRef = Word(alphas, alphanums) | QuotedString("'",escQuote="''") colRef = Optional(DOLLAR) + Word(alphas,max=2) rowRef = Optional(DOLLAR) + Word(nums) cellRef = Combine(Group(Optional(sheetRef + EXCL)("sheet") + colRef("col") + rowRef("row"))) cellRange = (Group(cellRef("start") + COLON + cellRef("end"))("range") | cellRef | Word(alphas,alphanums)) expr = Forward() COMPARISON_OP = oneOf("< = > >= <= != <>") condExpr = expr + COMPARISON_OP + expr ifFunc = (CaselessKeyword("if") - LPAR + Group(condExpr)("condition") + COMMA + Group(expr)("if_true") + COMMA + Group(expr)("if_false") + RPAR) statFunc = lambda name : Group(CaselessKeyword(name) + Group(LPAR + delimitedList(expr) + RPAR)) sumFunc = statFunc("sum") minFunc = statFunc("min") maxFunc = statFunc("max") aveFunc = statFunc("ave") funcCall = ifFunc | sumFunc | minFunc | maxFunc | aveFunc multOp = oneOf("* /") addOp = oneOf("+ -") numericLiteral = pyparsing_common.number operand = numericLiteral | funcCall | cellRange | cellRef arithExpr = infixNotation(operand, [ (multOp, 2, opAssoc.LEFT), (addOp, 2, opAssoc.LEFT), ]) textOperand = dblQuotedString | cellRef textExpr = infixNotation(textOperand, [ ('&', 2, opAssoc.LEFT), ]) expr << (arithExpr | textExpr) (EQ + expr).runTests("""\ =3*A7+5 =3*Sheet1!$A$7+5 =3*'Sheet 1'!$A$7+5" =3*'O''Reilly''s sheet'!$A$7+5 =if(Sum(A1:A25)>42,Min(B1:B25),if(Sum(C1:C25)>3.14, (Min(C1:C25)+3)*18,Max(B1:B25))) =sum(a1:a25,10,min(b1,c2,d3)) =if("T"&a2="TTime", "Ready", "Not ready") """)pyparsing-2.1.10/examples/fourFn.py0000666000000000000000000001636312652252012015376 0ustar 00000000000000# fourFn.py # # Demonstration of the pyparsing module, implementing a simple 4-function expression parser, # with support for scientific notation, and symbols for e and pi. # Extended to add exponentiation and simple built-in functions. # Extended test cases, simplified pushFirst method. # Removed unnecessary expr.suppress() call (thanks Nathaniel Peterson!), and added Group # Changed fnumber to use a Regex, which is now the preferred method # # Copyright 2003-2009 by Paul McGuire # from pyparsing import Literal,CaselessLiteral,Word,Group,Optional,\ ZeroOrMore,Forward,nums,alphas,alphanums,Regex,ParseException,\ CaselessKeyword, Suppress import math import operator exprStack = [] def pushFirst( strg, loc, toks ): exprStack.append( toks[0] ) def pushUMinus( strg, loc, toks ): for t in toks: if t == '-': exprStack.append( 'unary -' ) #~ exprStack.append( '-1' ) #~ exprStack.append( '*' ) else: break bnf = None def BNF(): """ expop :: '^' multop :: '*' | '/' addop :: '+' | '-' integer :: ['+' | '-'] '0'..'9'+ atom :: PI | E | real | fn '(' expr ')' | '(' expr ')' factor :: atom [ expop factor ]* term :: factor [ multop factor ]* expr :: term [ addop term ]* """ global bnf if not bnf: point = Literal( "." ) # use CaselessKeyword for e and pi, to avoid accidentally matching # functions that start with 'e' or 'pi' (such as 'exp'); Keyword # and CaselessKeyword only match whole words e = CaselessKeyword( "E" ) pi = CaselessKeyword( "PI" ) #~ fnumber = Combine( Word( "+-"+nums, nums ) + #~ Optional( point + Optional( Word( nums ) ) ) + #~ Optional( e + Word( "+-"+nums, nums ) ) ) fnumber = Regex(r"[+-]?\d+(?:\.\d*)?(?:[eE][+-]?\d+)?") ident = Word(alphas, alphanums+"_$") plus, minus, mult, div = map(Literal, "+-*/") lpar, rpar = map(Suppress, "()") addop = plus | minus multop = mult | div expop = Literal( "^" ) expr = Forward() atom = ((0,None)*minus + ( pi | e | fnumber | ident + lpar + expr + rpar | ident ).setParseAction( pushFirst ) | Group( lpar + expr + rpar )).setParseAction(pushUMinus) # by defining exponentiation as "atom [ ^ factor ]..." instead of "atom [ ^ atom ]...", we get right-to-left exponents, instead of left-to-righ # that is, 2^3^2 = 2^(3^2), not (2^3)^2. factor = Forward() factor << atom + ZeroOrMore( ( expop + factor ).setParseAction( pushFirst ) ) term = factor + ZeroOrMore( ( multop + factor ).setParseAction( pushFirst ) ) expr << term + ZeroOrMore( ( addop + term ).setParseAction( pushFirst ) ) bnf = expr return bnf # map operator symbols to corresponding arithmetic operations epsilon = 1e-12 opn = { "+" : operator.add, "-" : operator.sub, "*" : operator.mul, "/" : operator.truediv, "^" : operator.pow } fn = { "sin" : math.sin, "cos" : math.cos, "tan" : math.tan, "exp" : math.exp, "abs" : abs, "trunc" : lambda a: int(a), "round" : round, "sgn" : lambda a: (a > epsilon) - (a < -epsilon) } def evaluateStack( s ): op = s.pop() if op == 'unary -': return -evaluateStack( s ) if op in "+-*/^": op2 = evaluateStack( s ) op1 = evaluateStack( s ) return opn[op]( op1, op2 ) elif op == "PI": return math.pi # 3.1415926535 elif op == "E": return math.e # 2.718281828 elif op in fn: return fn[op]( evaluateStack( s ) ) elif op[0].isalpha(): raise Exception("invalid identifier '%s'" % op) else: return float( op ) if __name__ == "__main__": def test( s, expVal ): global exprStack exprStack[:] = [] try: results = BNF().parseString( s, parseAll=True ) val = evaluateStack( exprStack[:] ) except ParseException as e: print(s, "failed parse:", str(pe)) except Exception as e: print(s, "failed eval:", str(e)) else: if val == expVal: print(s, "=", val, results, "=>", exprStack) else: print(s+"!!!", val, "!=", expVal, results, "=>", exprStack) test( "9", 9 ) test( "-9", -9 ) test( "--9", 9 ) test( "-E", -math.e ) test( "9 + 3 + 6", 9 + 3 + 6 ) test( "9 + 3 / 11", 9 + 3.0 / 11 ) test( "(9 + 3)", (9 + 3) ) test( "(9+3) / 11", (9+3.0) / 11 ) test( "9 - 12 - 6", 9 - 12 - 6 ) test( "9 - (12 - 6)", 9 - (12 - 6) ) test( "2*3.14159", 2*3.14159 ) test( "3.1415926535*3.1415926535 / 10", 3.1415926535*3.1415926535 / 10 ) test( "PI * PI / 10", math.pi * math.pi / 10 ) test( "PI*PI/10", math.pi*math.pi/10 ) test( "PI^2", math.pi**2 ) test( "round(PI^2)", round(math.pi**2) ) test( "6.02E23 * 8.048", 6.02E23 * 8.048 ) test( "e / 3", math.e / 3 ) test( "sin(PI/2)", math.sin(math.pi/2) ) test( "trunc(E)", int(math.e) ) test( "trunc(-E)", int(-math.e) ) test( "round(E)", round(math.e) ) test( "round(-E)", round(-math.e) ) test( "E^PI", math.e**math.pi ) test( "exp(0)", 1 ) test( "exp(1)", math.e ) test( "2^3^2", 2**3**2 ) test( "2^3+2", 2**3+2 ) test( "2^3+5", 2**3+5 ) test( "2^9", 2**9 ) test( "sgn(-2)", -1 ) test( "sgn(0)", 0 ) test( "foo(0.1)", None ) test( "sgn(0.1)", 1 ) """ Test output: >pythonw -u fourFn.py 9 = 9.0 ['9'] => ['9'] 9 + 3 + 6 = 18.0 ['9', '+', '3', '+', '6'] => ['9', '3', '+', '6', '+'] 9 + 3 / 11 = 9.27272727273 ['9', '+', '3', '/', '11'] => ['9', '3', '11', '/', '+'] (9 + 3) = 12.0 [] => ['9', '3', '+'] (9+3) / 11 = 1.09090909091 ['/', '11'] => ['9', '3', '+', '11', '/'] 9 - 12 - 6 = -9.0 ['9', '-', '12', '-', '6'] => ['9', '12', '-', '6', '-'] 9 - (12 - 6) = 3.0 ['9', '-'] => ['9', '12', '6', '-', '-'] 2*3.14159 = 6.28318 ['2', '*', '3.14159'] => ['2', '3.14159', '*'] 3.1415926535*3.1415926535 / 10 = 0.986960440053 ['3.1415926535', '*', '3.1415926535', '/', '10'] => ['3.1415926535', '3.1415926535', '*', '10', '/'] PI * PI / 10 = 0.986960440109 ['PI', '*', 'PI', '/', '10'] => ['PI', 'PI', '*', '10', '/'] PI*PI/10 = 0.986960440109 ['PI', '*', 'PI', '/', '10'] => ['PI', 'PI', '*', '10', '/'] PI^2 = 9.86960440109 ['PI', '^', '2'] => ['PI', '2', '^'] 6.02E23 * 8.048 = 4.844896e+024 ['6.02E23', '*', '8.048'] => ['6.02E23', '8.048', '*'] e / 3 = 0.90609394282 ['E', '/', '3'] => ['E', '3', '/'] sin(PI/2) = 1.0 ['sin', 'PI', '/', '2'] => ['PI', '2', '/', 'sin'] trunc(E) = 2 ['trunc', 'E'] => ['E', 'trunc'] E^PI = 23.1406926328 ['E', '^', 'PI'] => ['E', 'PI', '^'] 2^3^2 = 512.0 ['2', '^', '3', '^', '2'] => ['2', '3', '2', '^', '^'] 2^3+2 = 10.0 ['2', '^', '3', '+', '2'] => ['2', '3', '^', '2', '+'] 2^9 = 512.0 ['2', '^', '9'] => ['2', '9', '^'] sgn(-2) = -1 ['sgn', '-2'] => ['-2', 'sgn'] sgn(0) = 0 ['sgn', '0'] => ['0', 'sgn'] sgn(0.1) = 1 ['sgn', '0.1'] => ['0.1', 'sgn'] >Exit code: 0 """ pyparsing-2.1.10/examples/gen_ctypes.py0000666000000000000000000001231512752442347016305 0ustar 00000000000000# # gen_ctypes.py # # Parse a .h header file to generate ctypes argtype and return type definitions # # Copyright 2004-2016, by Paul McGuire # from pyparsing import * typemap = { "byte" : "c_byte", "char" : "c_char", "char *" : "c_char_p", "double" : "c_double", "float" : "c_float", "int" : "c_int", "int16" : "c_int16", "int32" : "c_int32", "int64" : "c_int64", "int8" : "c_int8", "long" : "c_long", "longlong" : "c_longlong", "short" : "c_short", "size_t" : "c_size_t", "ubyte" : "c_ubyte", "uchar" : "c_ubyte", "u_char" : "c_ubyte", "uint" : "c_uint", "u_int" : "c_uint", "uint16" : "c_uint16", "uint32" : "c_uint32", "uint64" : "c_uint64", "uint8" : "c_uint8", "u_long" : "c_ulong", "ulong" : "c_ulong", "ulonglong" : "c_ulonglong", "ushort" : "c_ushort", "u_short" : "c_ushort", "void *" : "c_void_p", "voidp" : "c_voidp", "wchar" : "c_wchar", "wchar *" : "c_wchar_p", "Bool" : "c_bool", "void" : "None", } LPAR,RPAR,LBRACE,RBRACE,COMMA,SEMI = map(Suppress,"(){},;") ident = Word(alphas, alphanums + "_") integer = Regex(r"[+-]?\d+") hexinteger = Regex(r"0x[0-9a-fA-F]+") const = Suppress("const") primitiveType = oneOf(t for t in typemap if not t.endswith("*")) structType = Suppress("struct") + ident vartype = (Optional(const) + (primitiveType | structType | ident) + Optional(Word("*")("ptr"))) def normalizetype(t): if isinstance(t, ParseResults): return ' '.join(t) #~ ret = ParseResults([' '.join(t)]) #~ return ret vartype.setParseAction(normalizetype) arg = Group(vartype("argtype") + Optional(ident("argname"))) func_def = (vartype("fn_type") + ident("fn_name") + LPAR + Optional(delimitedList(arg|"..."))("fn_args") + RPAR + SEMI) def derivefields(t): if t.fn_args and t.fn_args[-1] == "...": t["varargs"]=True func_def.setParseAction(derivefields) fn_typedef = "typedef" + func_def var_typedef = "typedef" + primitiveType("primType") + ident("name") + SEMI enum_def = (Keyword("enum") + LBRACE + delimitedList(Group(ident("name") + '=' + (hexinteger|integer)("value")))("evalues") + Optional(COMMA) + RBRACE) c_header = open("snmp_api.h").read() module = "pynetsnmp" user_defined_types = set() typedefs = [] fn_typedefs = [] functions = [] enum_constants = [] # add structures commonly included from std lib headers def addStdType(t,namespace=""): fullname = namespace+'_'+t if namespace else t typemap[t] = fullname user_defined_types.add(t) addStdType("fd_set", "sys_select") addStdType("timeval", "sys_time") def getUDType(typestr): key = typestr.rstrip(" *") if key not in typemap: user_defined_types.add(key) typemap[key] = "%s_%s" % (module, key) def typeAsCtypes(typestr): if typestr in typemap: return typemap[typestr] if typestr.endswith("*"): return "POINTER(%s)" % typeAsCtypes(typestr.rstrip(" *")) return typestr # scan input header text for primitive typedefs for td,_,_ in var_typedef.scanString(c_header): typedefs.append( (td.name, td.primType) ) # add typedef type to typemap to map to itself typemap[td.name] = td.name # scan input header text for function typedefs fn_typedefs = fn_typedef.searchString(c_header) # add each function typedef to typemap to map to itself for fntd in fn_typedefs: typemap[fntd.fn_name] = fntd.fn_name # scan input header text, and keep running list of user-defined types for fn,_,_ in (cStyleComment.suppress() | fn_typedef.suppress() | func_def).scanString(c_header): if not fn: continue getUDType(fn.fn_type) for arg in fn.fn_args: if arg != "...": if arg.argtype not in typemap: getUDType(arg.argtype) functions.append(fn) # scan input header text for enums enum_def.ignore(cppStyleComment) for en_,_,_ in enum_def.scanString(c_header): for ev in en_.evalues: enum_constants.append( (ev.name, ev.value) ) print("from ctypes import *") print("%s = CDLL('%s.dll')" % (module, module)) print() print("# user defined types") for tdname,tdtyp in typedefs: print("%s = %s" % (tdname, typemap[tdtyp])) for fntd in fn_typedefs: print("%s = CFUNCTYPE(%s)" % (fntd.fn_name, ',\n '.join(typeAsCtypes(a.argtype) for a in fntd.fn_args))) for udtype in user_defined_types: print("class %s(Structure): pass" % typemap[udtype]) print() print("# constant definitions") for en,ev in enum_constants: print("%s = %s" % (en,ev)) print() print("# functions") for fn in functions: prefix = "%s.%s" % (module, fn.fn_name) print("%s.restype = %s" % (prefix, typeAsCtypes(fn.fn_type))) if fn.varargs: print("# warning - %s takes variable argument list" % prefix) del fn.fn_args[-1] if fn.fn_args.asList() != [['void']]: print("%s.argtypes = (%s,)" % (prefix, ','.join(typeAsCtypes(a.argtype) for a in fn.fn_args))) else: print("%s.argtypes = ()" % (prefix)) pyparsing-2.1.10/examples/getNTPservers.py0000666000000000000000000000211512716764103016712 0ustar 00000000000000# getNTPservers.py # # Demonstration of the parsing module, implementing a HTML page scanner, # to extract a list of NTP time servers from the NIST web site. # # Copyright 2004, by Paul McGuire # from pyparsing import Word, Combine, Suppress, CharsNotIn, nums import urllib.request, urllib.parse, urllib.error integer = Word(nums) ipAddress = Combine( integer + "." + integer + "." + integer + "." + integer ) tdStart = Suppress("") tdEnd = Suppress("") timeServerPattern = tdStart + ipAddress.setResultsName("ipAddr") + tdEnd + \ tdStart + CharsNotIn("<").setResultsName("loc") + tdEnd # get list of time servers nistTimeServerURL = "http://www.boulder.nist.gov/timefreq/service/time-servers.html" serverListPage = urllib.request.urlopen( nistTimeServerURL ) serverListHTML = serverListPage.read() serverListPage.close() addrs = {} for srvr,startloc,endloc in timeServerPattern.scanString( serverListHTML ): print(srvr.ipAddr, "-", srvr.loc) addrs[srvr.ipAddr] = srvr.loc # or do this: #~ addr,loc = srvr #~ print addr, "-", loc pyparsing-2.1.10/examples/getNTPserversNew.py0000666000000000000000000000257212716764010017370 0ustar 00000000000000# getNTPserversNew.py # # Demonstration of the parsing module, implementing a HTML page scanner, # to extract a list of NTP time servers from the NIST web site. # # Copyright 2004-2010, by Paul McGuire # September, 2010 - updated to more current use of setResultsName, new NIST URL # from pyparsing import (Word, Combine, Suppress, SkipTo, nums, makeHTMLTags, delimitedList, alphas, alphanums) try: import urllib.request urlopen = urllib.request.urlopen except ImportError: import urllib urlopen = urllib.urlopen integer = Word(nums) ipAddress = Combine( integer + "." + integer + "." + integer + "." + integer ) hostname = delimitedList(Word(alphas,alphanums+"-_"),".",combine=True) tdStart,tdEnd = makeHTMLTags("td") timeServerPattern = (tdStart + hostname("hostname") + tdEnd + tdStart + ipAddress("ipAddr") + tdEnd + tdStart + SkipTo(tdEnd)("loc") + tdEnd) # get list of time servers nistTimeServerURL = "http://tf.nist.gov/tf-cgi/servers.cgi#" serverListPage = urlopen( nistTimeServerURL ) serverListHTML = serverListPage.read().decode("UTF-8") serverListPage.close() addrs = {} for srvr,startloc,endloc in timeServerPattern.scanString( serverListHTML ): print("%s (%s) - %s" % (srvr.ipAddr, srvr.hostname.strip(), srvr.loc.strip())) addrs[srvr.ipAddr] = srvr.loc pyparsing-2.1.10/examples/greeting.py0000666000000000000000000000056412466013312015740 0ustar 00000000000000# greeting.py # # Demonstration of the pyparsing module, on the prototypical "Hello, World!" # example # # Copyright 2003, by Paul McGuire # from pyparsing import Word, alphas # define grammar greet = Word( alphas ) + "," + Word( alphas ) + "!" # input string hello = "Hello, World!" # parse input string print(hello, "->", greet.parseString( hello )) pyparsing-2.1.10/examples/greetingInGreek.py0000666000000000000000000000073512752442222017211 0ustar 00000000000000# vim:fileencoding=utf-8 # # greetingInGreek.py # # Demonstration of the parsing module, on the prototypical "Hello, World!" example # # Copyright 2004-2016, by Paul McGuire # from pyparsing import Word # define grammar alphas = ''.join(chr(x) for x in range(0x386, 0x3ce)) greet = Word(alphas) + ',' + Word(alphas) + '!' # input string hello = "Καλημέρα, κόσμε!".decode('utf-8') # parse input string print(greet.parseString( hello )) pyparsing-2.1.10/examples/greetingInKorean.py0000666000000000000000000000101212752442052017361 0ustar 00000000000000# vim:fileencoding=utf-8 # # greetingInKorean.py # # Demonstration of the parsing module, on the prototypical "Hello, World!" example # # Copyright 2004-2016, by Paul McGuire # from pyparsing import Word, srange koreanChars = srange(r"[\0xac00-\0xd7a3]") koreanWord = Word(koreanChars,min=2) # define grammar greet = koreanWord + "," + koreanWord + "!" # input string hello = '\uc548\ub155, \uc5ec\ub7ec\ubd84!' #"Hello, World!" in Korean # parse input string print(greet.parseString( hello )) pyparsing-2.1.10/examples/groupUsingListAllMatches.py0000666000000000000000000000077512752442036021103 0ustar 00000000000000# # A simple example showing the use of the implied listAllMatches=True for # results names with a trailing '*' character. # # This example performs work similar to itertools.groupby, but without # having to sort the input first. # # Copyright 2004-2016, by Paul McGuire # from pyparsing import Word, ZeroOrMore, nums aExpr = Word("A", nums) bExpr = Word("B", nums) cExpr = Word("C", nums) grammar = ZeroOrMore(aExpr("A*") | bExpr("B*") | cExpr("C*")) grammar.runTests("A1 B1 A2 C1 B2 A3") pyparsing-2.1.10/examples/holaMundo.py0000666000000000000000000000235112752441714016067 0ustar 00000000000000# -*- coding: UTF-8 -*- # escrito por Marco Alfonso, 2004 Noviembre # importamos el modulo from pyparsing import * saludo= Word(alphas) + ',' + Word(alphas) + '!' # Aqui decimos que la gramatica "saludo" DEBE contener # una palabra compuesta de caracteres alfanumericos # (Word(alphas)) mas una ',' mas otra palabra alfanumerica, # mas '!' y esos seian nuestros tokens tokens = saludo.parseString("Hola, Mundo !") # Ahora parseamos una cadena, "Hola, Mundo!", # el metodo parseString, nos devuelve una lista con los tokens # encontrados, en caso de no haber errores... for i in range(len(tokens)): print ("Token %d -> %s" % (i,tokens[i])) #imprimimos cada uno de los tokens Y listooo!!, he aquí a salida # Token 0 -> Hola # Token 1 -> , # Token 2-> Mundo # Token 3 -> ! # Por supuesto, se pueden "reutilizar" gramáticas, por ejemplo: numimag = Word(nums) + 'i' numreal = Word(nums) numcomplex = numreal + '+' + numimag print (numcomplex.parseString("3+5i")) # Cambiar a complejo numero durante parsear: numcomplex.setParseAction(lambda t: complex(''.join(t).replace('i','j'))) print (numcomplex.parseString("3+5i")) # Excelente!!, bueno, los dejo, me voy a seguir tirando código... pyparsing-2.1.10/examples/htmlStripper.py0000666000000000000000000000227412754024272016640 0ustar 00000000000000# # htmlStripper.py # # Sample code for stripping HTML markup tags and scripts from # HTML source files. # # Copyright (c) 2006, 2016, Paul McGuire # from contextlib import closing import urllib.request, urllib.parse, urllib.error from pyparsing import (makeHTMLTags, SkipTo, commonHTMLEntity, replaceHTMLEntity, htmlComment, anyOpenTag, anyCloseTag, LineEnd, OneOrMore, replaceWith) scriptOpen,scriptClose = makeHTMLTags("script") scriptBody = scriptOpen + SkipTo(scriptClose) + scriptClose commonHTMLEntity.setParseAction(replaceHTMLEntity) # get some HTML targetURL = "http://wiki.python.org/moin/PythonDecoratorLibrary" with closing(urllib.request.urlopen( targetURL )) as targetPage: targetHTML = targetPage.read().decode("UTF-8") # first pass, strip out tags and translate entities firstPass = (htmlComment | scriptBody | commonHTMLEntity | anyOpenTag | anyCloseTag ).suppress().transformString(targetHTML) # first pass leaves many blank lines, collapse these down repeatedNewlines = LineEnd() + OneOrMore(LineEnd()) repeatedNewlines.setParseAction(replaceWith("\n\n")) secondPass = repeatedNewlines.transformString(firstPass) print(secondPass)pyparsing-2.1.10/examples/httpServerLogParser.py0000666000000000000000000000704012752440075020125 0ustar 00000000000000# httpServerLogParser.py # # Copyright (c) 2016, Paul McGuire # """ Parser for HTTP server log output, of the form: 195.146.134.15 - - [20/Jan/2003:08:55:36 -0800] "GET /path/to/page.html HTTP/1.0" 200 4649 "http://www.somedomain.com/020602/page.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" 127.0.0.1 - u.surname@domain.com [12/Sep/2006:14:13:53 +0300] "GET /skins/monobook/external.png HTTP/1.0" 304 - "http://wiki.mysite.com/skins/monobook/main.css" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6" You can then break it up as follows: IP ADDRESS - - Server Date / Time [SPACE] "GET /path/to/page HTTP/Type Request" Success Code Bytes Sent To Client Referer Client Software """ from pyparsing import alphas,nums, dblQuotedString, Combine, Word, Group, delimitedList, Suppress, removeQuotes import string def getCmdFields( s, l, t ): t["method"],t["requestURI"],t["protocolVersion"] = t[0].strip('"').split() logLineBNF = None def getLogLineBNF(): global logLineBNF if logLineBNF is None: integer = Word( nums ) ipAddress = delimitedList( integer, ".", combine=True ) timeZoneOffset = Word("+-",nums) month = Word(string.uppercase, string.lowercase, exact=3) serverDateTime = Group( Suppress("[") + Combine( integer + "/" + month + "/" + integer + ":" + integer + ":" + integer + ":" + integer ) + timeZoneOffset + Suppress("]") ) logLineBNF = ( ipAddress.setResultsName("ipAddr") + Suppress("-") + ("-" | Word( alphas+nums+"@._" )).setResultsName("auth") + serverDateTime.setResultsName("timestamp") + dblQuotedString.setResultsName("cmd").setParseAction(getCmdFields) + (integer | "-").setResultsName("statusCode") + (integer | "-").setResultsName("numBytesSent") + dblQuotedString.setResultsName("referrer").setParseAction(removeQuotes) + dblQuotedString.setResultsName("clientSfw").setParseAction(removeQuotes) ) return logLineBNF testdata = """ 195.146.134.15 - - [20/Jan/2003:08:55:36 -0800] "GET /path/to/page.html HTTP/1.0" 200 4649 "http://www.somedomain.com/020602/page.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" 111.111.111.11 - - [16/Feb/2004:04:09:49 -0800] "GET /ads/redirectads/336x280redirect.htm HTTP/1.1" 304 - "http://www.foobarp.org/theme_detail.php?type=vs&cat=0&mid=27512" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" 11.111.11.111 - - [16/Feb/2004:10:35:12 -0800] "GET /ads/redirectads/468x60redirect.htm HTTP/1.1" 200 541 "http://11.11.111.11/adframe.php?n=ad1f311a&what=zone:56" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) Opera 7.20 [ru\"]" 127.0.0.1 - u.surname@domain.com [12/Sep/2006:14:13:53 +0300] "GET /skins/monobook/external.png HTTP/1.0" 304 - "http://wiki.mysite.com/skins/monobook/main.css" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6" """ for line in testdata.split("\n"): if not line: continue fields = getLogLineBNF().parseString(line) print(fields.dump()) #~ print repr(fields) #~ for k in fields.keys(): #~ print "fields." + k + " =", fields[k] print(fields.asXML("LOG")) print() pyparsing-2.1.10/examples/idlParse.py0000666000000000000000000001452412766440122015706 0ustar 00000000000000# # idlparse.py # # an example of using the parsing module to be able to process a subset of the CORBA IDL grammar # # Copyright (c) 2003, Paul McGuire # from pyparsing import Literal, CaselessLiteral, Word, OneOrMore, ZeroOrMore, \ Forward, NotAny, delimitedList, oneOf, Group, Optional, Combine, alphas, nums, restOfLine, cStyleComment, \ alphanums, printables, empty, quotedString, ParseException, ParseResults, Keyword, Regex import pprint #~ import tree2image bnf = None def CORBA_IDL_BNF(): global bnf if not bnf: # punctuation (colon,lbrace,rbrace,lbrack,rbrack,lparen,rparen, equals,comma,dot,slash,bslash,star,semi,langle,rangle) = map(Literal, r":{}[]()=,./\*;<>") # keywords (any_, attribute_, boolean_, case_, char_, const_, context_, default_, double_, enum_, exception_, FALSE_, fixed_, float_, inout_, interface_, in_, long_, module_, Object_, octet_, oneway_, out_, raises_, readonly_, sequence_, short_, string_, struct_, switch_, TRUE_, typedef_, unsigned_, union_, void_, wchar_, wstring_) = map(Keyword, """any attribute boolean case char const context default double enum exception FALSE fixed float inout interface in long module Object octet oneway out raises readonly sequence short string struct switch TRUE typedef unsigned union void wchar wstring""".split()) identifier = Word( alphas, alphanums + "_" ).setName("identifier") real = Regex(r"[+-]?\d+\.\d*([Ee][+-]?\d+)?").setName("real") integer = Regex(r"0x[0-9a-fA-F]+|[+-]?\d+").setName("int") udTypeName = delimitedList( identifier, "::", combine=True ).setName("udType") typeName = ( any_ | boolean_ | char_ | double_ | fixed_ | float_ | long_ | octet_ | short_ | string_ | wchar_ | wstring_ | udTypeName ).setName("type") sequenceDef = Forward().setName("seq") sequenceDef << Group( sequence_ + langle + ( sequenceDef | typeName ) + rangle ) typeDef = sequenceDef | ( typeName + Optional( lbrack + integer + rbrack ) ) typedefDef = Group( typedef_ + typeDef + identifier + semi ).setName("typedef") moduleDef = Forward() constDef = Group( const_ + typeDef + identifier + equals + ( real | integer | quotedString ) + semi ) #| quotedString ) exceptionItem = Group( typeDef + identifier + semi ) exceptionDef = ( exception_ + identifier + lbrace + ZeroOrMore( exceptionItem ) + rbrace + semi ) attributeDef = Optional( readonly_ ) + attribute_ + typeDef + identifier + semi paramlist = delimitedList( Group( ( inout_ | in_ | out_ ) + typeName + identifier ) ).setName( "paramlist" ) operationDef = ( ( void_ ^ typeDef ) + identifier + lparen + Optional( paramlist ) + rparen + \ Optional( raises_ + lparen + Group( delimitedList( typeName ) ) + rparen ) + semi ) interfaceItem = ( constDef | exceptionDef | attributeDef | operationDef ) interfaceDef = Group( interface_ + identifier + Optional( colon + delimitedList( typeName ) ) + lbrace + \ ZeroOrMore( interfaceItem ) + rbrace + semi ).setName("opnDef") moduleItem = ( interfaceDef | exceptionDef | constDef | typedefDef | moduleDef ) moduleDef << module_ + identifier + lbrace + ZeroOrMore( moduleItem ) + rbrace + semi bnf = ( moduleDef | OneOrMore( moduleItem ) ) singleLineComment = "//" + restOfLine bnf.ignore( singleLineComment ) bnf.ignore( cStyleComment ) return bnf testnum = 1 def test( strng ): global testnum print(strng) try: bnf = CORBA_IDL_BNF() tokens = bnf.parseString( strng ) print("tokens = ") pprint.pprint( tokens.asList() ) imgname = "idlParse%02d.bmp" % testnum testnum += 1 #~ tree2image.str2image( str(tokens.asList()), imgname ) except ParseException as err: print(err.line) print(" "*(err.column-1) + "^") print(err) print() if __name__ == "__main__": test( """ /* * a block comment * */ typedef string[10] tenStrings; typedef sequence stringSeq; typedef sequence< sequence > stringSeqSeq; interface QoSAdmin { stringSeq method1( in string arg1, inout long arg2 ); stringSeqSeq method2( in string arg1, inout long arg2, inout long arg3); string method3(); }; """ ) test( """ /* * a block comment * */ typedef string[10] tenStrings; typedef /** ** *** **** * * a block comment * */ sequence /*comment inside an And */ stringSeq; /* */ /**/ /***/ /****/ typedef sequence< sequence > stringSeqSeq; interface QoSAdmin { stringSeq method1( in string arg1, inout long arg2 ); stringSeqSeq method2( in string arg1, inout long arg2, inout long arg3); string method3(); }; """ ) test( r""" const string test="Test String\n"; const long a = 0; const long b = -100; const float c = 3.14159; const long d = 0x007f7f7f; exception TestException { string msg; sequence dataStrings; }; interface TestInterface { void method1( in string arg1, inout long arg2 ); }; """ ) test( """ module Test1 { exception TestException { string msg; ]; interface TestInterface { void method1( in string arg1, inout long arg2 ) raises ( TestException ); }; }; """ ) test( """ module Test1 { exception TestException { string msg; }; }; """ ) pyparsing-2.1.10/examples/indentedGrammarExample.py0000666000000000000000000000203712751534241020554 0ustar 00000000000000# indentedGrammarExample.py # # Copyright (c) 2006,2016 Paul McGuire # # A sample of a pyparsing grammar using indentation for # grouping (like Python does). # # Updated to use indentedBlock helper method. # from pyparsing import * data = """\ def A(z): A1 B = 100 G = A2 A2 A3 B def BB(a,b,c): BB1 def BBA(): bba1 bba2 bba3 C D def spam(x,y): def eggs(z): pass """ indentStack = [1] stmt = Forward() suite = indentedBlock(stmt, indentStack) identifier = Word(alphas, alphanums) funcDecl = ("def" + identifier + Group( "(" + Optional( delimitedList(identifier) ) + ")" ) + ":") funcDef = Group( funcDecl + suite ) rvalue = Forward() funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")") rvalue << (funcCall | identifier | Word(nums)) assignment = Group(identifier + "=" + rvalue) stmt << ( funcDef | assignment | identifier ) module_body = OneOrMore(stmt) print(data) parseTree = module_body.parseString(data) parseTree.pprint() pyparsing-2.1.10/examples/invRegex.py0000666000000000000000000001754312716265061015740 0ustar 00000000000000# # invRegex.py # # Copyright 2008, Paul McGuire # # pyparsing script to expand a regular expression into all possible matching strings # Supports: # - {n} and {m,n} repetition, but not unbounded + or * repetition # - ? optional elements # - [] character ranges # - () grouping # - | alternation # __all__ = ["count","invert"] from pyparsing import (Literal, oneOf, printables, ParserElement, Combine, SkipTo, infixNotation, ParseFatalException, Word, nums, opAssoc, Suppress, ParseResults, srange) class CharacterRangeEmitter(object): def __init__(self,chars): # remove duplicate chars in character range, but preserve original order seen = set() self.charset = "".join( seen.add(c) or c for c in chars if c not in seen ) def __str__(self): return '['+self.charset+']' def __repr__(self): return '['+self.charset+']' def makeGenerator(self): def genChars(): for s in self.charset: yield s return genChars class OptionalEmitter(object): def __init__(self,expr): self.expr = expr def makeGenerator(self): def optionalGen(): yield "" for s in self.expr.makeGenerator()(): yield s return optionalGen class DotEmitter(object): def makeGenerator(self): def dotGen(): for c in printables: yield c return dotGen class GroupEmitter(object): def __init__(self,exprs): self.exprs = ParseResults(exprs) def makeGenerator(self): def groupGen(): def recurseList(elist): if len(elist)==1: for s in elist[0].makeGenerator()(): yield s else: for s in elist[0].makeGenerator()(): for s2 in recurseList(elist[1:]): yield s + s2 if self.exprs: for s in recurseList(self.exprs): yield s return groupGen class AlternativeEmitter(object): def __init__(self,exprs): self.exprs = exprs def makeGenerator(self): def altGen(): for e in self.exprs: for s in e.makeGenerator()(): yield s return altGen class LiteralEmitter(object): def __init__(self,lit): self.lit = lit def __str__(self): return "Lit:"+self.lit def __repr__(self): return "Lit:"+self.lit def makeGenerator(self): def litGen(): yield self.lit return litGen def handleRange(toks): return CharacterRangeEmitter(srange(toks[0])) def handleRepetition(toks): toks=toks[0] if toks[1] in "*+": raise ParseFatalException("",0,"unbounded repetition operators not supported") if toks[1] == "?": return OptionalEmitter(toks[0]) if "count" in toks: return GroupEmitter([toks[0]] * int(toks.count)) if "minCount" in toks: mincount = int(toks.minCount) maxcount = int(toks.maxCount) optcount = maxcount - mincount if optcount: opt = OptionalEmitter(toks[0]) for i in range(1,optcount): opt = OptionalEmitter(GroupEmitter([toks[0],opt])) return GroupEmitter([toks[0]] * mincount + [opt]) else: return [toks[0]] * mincount def handleLiteral(toks): lit = "" for t in toks: if t[0] == "\\": if t[1] == "t": lit += '\t' else: lit += t[1] else: lit += t return LiteralEmitter(lit) def handleMacro(toks): macroChar = toks[0][1] if macroChar == "d": return CharacterRangeEmitter("0123456789") elif macroChar == "w": return CharacterRangeEmitter(srange("[A-Za-z0-9_]")) elif macroChar == "s": return LiteralEmitter(" ") else: raise ParseFatalException("",0,"unsupported macro character (" + macroChar + ")") def handleSequence(toks): return GroupEmitter(toks[0]) def handleDot(): return CharacterRangeEmitter(printables) def handleAlternative(toks): return AlternativeEmitter(toks[0]) _parser = None def parser(): global _parser if _parser is None: ParserElement.setDefaultWhitespaceChars("") lbrack,rbrack,lbrace,rbrace,lparen,rparen,colon,qmark = map(Literal,"[]{}():?") reMacro = Combine("\\" + oneOf(list("dws"))) escapedChar = ~reMacro + Combine("\\" + oneOf(list(printables))) reLiteralChar = "".join(c for c in printables if c not in r"\[]{}().*?+|") + " \t" reRange = Combine(lbrack + SkipTo(rbrack,ignore=escapedChar) + rbrack) reLiteral = ( escapedChar | oneOf(list(reLiteralChar)) ) reNonCaptureGroup = Suppress("?:") reDot = Literal(".") repetition = ( ( lbrace + Word(nums)("count") + rbrace ) | ( lbrace + Word(nums)("minCount")+","+ Word(nums)("maxCount") + rbrace ) | oneOf(list("*+?")) ) reRange.setParseAction(handleRange) reLiteral.setParseAction(handleLiteral) reMacro.setParseAction(handleMacro) reDot.setParseAction(handleDot) reTerm = ( reLiteral | reRange | reMacro | reDot | reNonCaptureGroup) reExpr = infixNotation( reTerm, [ (repetition, 1, opAssoc.LEFT, handleRepetition), (None, 2, opAssoc.LEFT, handleSequence), (Suppress('|'), 2, opAssoc.LEFT, handleAlternative), ] ) _parser = reExpr return _parser def count(gen): """Simple function to count the number of elements returned by a generator.""" return sum(1 for _ in gen) def invert(regex): """Call this routine as a generator to return all the strings that match the input regular expression. for s in invert("[A-Z]{3}\d{3}"): print s """ invReGenerator = GroupEmitter(parser().parseString(regex)).makeGenerator() return invReGenerator() def main(): tests = r""" [A-EA] [A-D]* [A-D]{3} X[A-C]{3}Y X[A-C]{3}\( X\d foobar\d\d foobar{2} foobar{2,9} fooba[rz]{2} (foobar){2} ([01]\d)|(2[0-5]) (?:[01]\d)|(2[0-5]) ([01]\d\d)|(2[0-4]\d)|(25[0-5]) [A-C]{1,2} [A-C]{0,3} [A-C]\s[A-C]\s[A-C] [A-C]\s?[A-C][A-C] [A-C]\s([A-C][A-C]) [A-C]\s([A-C][A-C])? [A-C]{2}\d{2} @|TH[12] @(@|TH[12])? @(@|TH[12]|AL[12]|SP[123]|TB(1[0-9]?|20?|[3-9]))? @(@|TH[12]|AL[12]|SP[123]|TB(1[0-9]?|20?|[3-9])|OH(1[0-9]?|2[0-9]?|30?|[4-9]))? (([ECMP]|HA|AK)[SD]|HS)T [A-CV]{2} A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|E[rsu]|F[emr]?|G[ade]|H[efgos]?|I[nr]?|Kr?|L[airu]|M[dgnot]|N[abdeiop]?|Os?|P[abdmortu]?|R[abefghnu]|S[bcegimnr]?|T[abcehilm]|Uu[bhopqst]|U|V|W|Xe|Yb?|Z[nr] (a|b)|(x|y) (a|b) (x|y) [ABCDEFG](?:#|##|b|bb)?(?:maj|min|m|sus|aug|dim)?[0-9]?(?:/[ABCDEFG](?:#|##|b|bb)?)? (Fri|Mon|S(atur|un)|T(hur|ue)s|Wednes)day A(pril|ugust)|((Dec|Nov|Sept)em|Octo)ber|(Febr|Jan)uary|Ju(ly|ne)|Ma(rch|y) """.split('\n') for t in tests: t = t.strip() if not t: continue print('-'*50) print(t) try: num = count(invert(t)) print(num) maxprint = 30 for s in invert(t): print(s) maxprint -= 1 if not maxprint: break except ParseFatalException as pfe: print(pfe.msg) print('') continue print('') if __name__ == "__main__": main() pyparsing-2.1.10/examples/jsonParser.py0000666000000000000000000000634412752437611016276 0ustar 00000000000000# jsonParser.py # # Implementation of a simple JSON parser, returning a hierarchical # ParseResults object support both list- and dict-style data access. # # Copyright 2006, by Paul McGuire # # Updated 8 Jan 2007 - fixed dict grouping bug, and made elements and # members optional in array and object collections # # Updated 9 Aug 2016 - use more current pyparsing constructs/idioms # json_bnf = """ object { members } {} members string : value members , string : value array [ elements ] [] elements value elements , value value string number object array true false null """ from pyparsing import * def make_keyword(kwd_str, kwd_value): return Keyword(kwd_str).setParseAction(replaceWith(kwd_value)) TRUE = make_keyword("true", True) FALSE = make_keyword("false", False) NULL = make_keyword("null", None) LBRACK, RBRACK, LBRACE, RBRACE, COLON = map(Suppress, "[]{}:") jsonString = dblQuotedString().setParseAction(removeQuotes) jsonNumber = pyparsing_common.number() jsonObject = Forward() jsonValue = Forward() jsonElements = delimitedList( jsonValue ) jsonArray = Group(LBRACK + Optional(jsonElements, []) + RBRACK) jsonValue << (jsonString | jsonNumber | Group(jsonObject) | jsonArray | TRUE | FALSE | NULL) memberDef = Group(jsonString + COLON + jsonValue) jsonMembers = delimitedList(memberDef) jsonObject << Dict(LBRACE + Optional(jsonMembers) + RBRACE) jsonComment = cppStyleComment jsonObject.ignore(jsonComment) if __name__ == "__main__": testdata = """ { "glossary": { "title": "example glossary", "GlossDiv": { "title": "S", "GlossList": { "ID": "SGML", "SortAs": "SGML", "GlossTerm": "Standard Generalized Markup Language", "TrueValue": true, "FalseValue": false, "Gravity": -9.8, "LargestPrimeLessThan100": 97, "AvogadroNumber": 6.02E23, "EvenPrimesGreaterThan2": null, "PrimesLessThan10" : [2,3,5,7], "Acronym": "SGML", "Abbrev": "ISO 8879:1986", "GlossDef": "A meta-markup language, used to create markup languages such as DocBook.", "GlossSeeAlso": ["GML", "XML", "markup"], "EmptyDict" : {}, "EmptyList" : [] } } } } """ import pprint results = jsonObject.parseString(testdata) pprint.pprint( results.asList() ) print() def testPrint(x): print(type(x),repr(x)) print(list(results.glossary.GlossDiv.GlossList.keys())) testPrint( results.glossary.title ) testPrint( results.glossary.GlossDiv.GlossList.ID ) testPrint( results.glossary.GlossDiv.GlossList.FalseValue ) testPrint( results.glossary.GlossDiv.GlossList.Acronym ) testPrint( results.glossary.GlossDiv.GlossList.EvenPrimesGreaterThan2 ) testPrint( results.glossary.GlossDiv.GlossList.PrimesLessThan10 ) pyparsing-2.1.10/examples/LAparser.py0000666000000000000000000004405312466013312015646 0ustar 00000000000000""" Purpose: Linear Algebra Parser Based on: SimpleCalc.py example (author Paul McGuire) in pyparsing-1.3.3 Author: Mike Ellis Copyright: Ellis & Grant, Inc. 2005 License: You may freely use, modify, and distribute this software. Warranty: THIS SOFTWARE HAS NO WARRANTY WHATSOEVER. USE AT YOUR OWN RISK. Notes: Parses infix linear algebra (LA) notation for vectors, matrices, and scalars. Output is C code function calls. The parser can be run as an interactive interpreter or included as module to use for in-place substitution into C files containing LA equations. Supported operations are: OPERATION: INPUT OUTPUT Scalar addition: "a = b+c" "a=(b+c)" Scalar subtraction: "a = b-c" "a=(b-c)" Scalar multiplication: "a = b*c" "a=b*c" Scalar division: "a = b/c" "a=b/c" Scalar exponentiation: "a = b^c" "a=pow(b,c)" Vector scaling: "V3_a = V3_b * c" "vCopy(a,vScale(b,c))" Vector addition: "V3_a = V3_b + V3_c" "vCopy(a,vAdd(b,c))" Vector subtraction: "V3_a = V3_b - V3_c" "vCopy(a,vSubtract(b,c))" Vector dot product: "a = V3_b * V3_c" "a=vDot(b,c)" Vector outer product: "M3_a = V3_b @ V3_c" "a=vOuterProduct(b,c)" Vector magn. squared: "a = V3_b^Mag2" "a=vMagnitude2(b)" Vector magnitude: "a = V3_b^Mag" "a=sqrt(vMagnitude2(b))" Matrix scaling: "M3_a = M3_b * c" "mCopy(a,mScale(b,c))" Matrix addition: "M3_a = M3_b + M3_c" "mCopy(a,mAdd(b,c))" Matrix subtraction: "M3_a = M3_b - M3_c" "mCopy(a,mSubtract(b,c))" Matrix multiplication: "M3_a = M3_b * M3_c" "mCopy(a,mMultiply(b,c))" Matrix by vector mult.: "V3_a = M3_b * V3_c" "vCopy(a,mvMultiply(b,c))" Matrix inversion: "M3_a = M3_b^-1" "mCopy(a,mInverse(b))" Matrix transpose: "M3_a = M3_b^T" "mCopy(a,mTranspose(b))" Matrix determinant: "a = M3_b^Det" "a=mDeterminant(b)" The parser requires the expression to be an equation. Each non-scalar variable must be prefixed with a type tag, 'M3_' for 3x3 matrices and 'V3_' for 3-vectors. For proper compilation of the C code, the variables need to be declared without the prefix as float[3] for vectors and float[3][3] for matrices. The operations do not modify any variables on the right-hand side of the equation. Equations may include nested expressions within parentheses. The allowed binary operators are '+-*/^' for scalars, and '+-*^@' for vectors and matrices with the meanings defined in the table above. Specifying an improper combination of operands, e.g. adding a vector to a matrix, is detected by the parser and results in a Python TypeError Exception. The usual cause of this is omitting one or more tag prefixes. The parser knows nothing about a a variable's C declaration and relies entirely on the type tags. Errors in C declarations are not caught until compile time. Usage: To process LA equations embedded in source files, import this module and pass input and output file objects to the fprocess() function. You can can also invoke the parser from the command line, e.g. 'python LAparser.py', to run a small test suite and enter an interactive loop where you can enter LA equations and see the resulting C code. """ import re,os,sys from pyparsing import Word, alphas, ParseException, Literal, CaselessLiteral \ , Combine, Optional, nums, Or, Forward, OneOrMore, ZeroOrMore, \ FollowedBy, StringStart, StringEnd, alphanums import math # Debugging flag can be set to either "debug_flag=True" or "debug_flag=False" debug_flag=False #---------------------------------------------------------------------------- # Variables that hold intermediate parsing results and a couple of # helper functions. exprStack = [] # Holds operators and operands parsed from input. targetvar = None # Holds variable name to left of '=' sign in LA equation. def _pushFirst( str, loc, toks ): if debug_flag: print("pushing ", toks[0], "str is ", str) exprStack.append( toks[0] ) def _assignVar( str, loc, toks ): global targetvar targetvar = toks[0] #----------------------------------------------------------------------------- # The following statements define the grammar for the parser. point = Literal('.') e = CaselessLiteral('E') plusorminus = Literal('+') | Literal('-') number = Word(nums) integer = Combine( Optional(plusorminus) + number ) floatnumber = Combine( integer + Optional( point + Optional(number) ) + Optional( e + integer ) ) lbracket = Literal("[") rbracket = Literal("]") ident = Forward() ## The definition below treats array accesses as identifiers. This means your expressions ## can include references to array elements, rows and columns, e.g., a = b[i] + 5. ## Expressions within []'s are not presently supported, so a = b[i+1] will raise ## a ParseException. ident = Combine(Word(alphas + '-',alphanums + '_') + \ ZeroOrMore(lbracket + (Word(alphas + '-',alphanums + '_')|integer) + rbracket) \ ) plus = Literal( "+" ) minus = Literal( "-" ) mult = Literal( "*" ) div = Literal( "/" ) outer = Literal( "@" ) lpar = Literal( "(" ).suppress() rpar = Literal( ")" ).suppress() addop = plus | minus multop = mult | div | outer expop = Literal( "^" ) assignop = Literal( "=" ) expr = Forward() atom = ( ( e | floatnumber | integer | ident ).setParseAction(_pushFirst) | ( lpar + expr.suppress() + rpar ) ) factor = Forward() factor << atom + ZeroOrMore( ( expop + factor ).setParseAction( _pushFirst ) ) term = factor + ZeroOrMore( ( multop + factor ).setParseAction( _pushFirst ) ) expr << term + ZeroOrMore( ( addop + term ).setParseAction( _pushFirst ) ) equation = (ident + assignop).setParseAction(_assignVar) + expr + StringEnd() # End of grammar definition #----------------------------------------------------------------------------- ## The following are helper variables and functions used by the Binary Infix Operator ## Functions described below. vprefix = 'V3_' vplen = len(vprefix) mprefix = 'M3_' mplen = len(mprefix) ## We don't support unary negation for vectors and matrices class UnaryUnsupportedError(Exception): pass def _isvec(ident): if ident[0] == '-' and ident[1:vplen+1] == vprefix: raise UnaryUnsupportedError else: return ident[0:vplen] == vprefix def _ismat(ident): if ident[0] == '-' and ident[1:mplen+1] == mprefix: raise UnaryUnsupportedError else: return ident[0:mplen] == mprefix def _isscalar(ident): return not (_isvec(ident) or _ismat(ident)) ## Binary infix operator (BIO) functions. These are called when the stack evaluator ## pops a binary operator like '+' or '*". The stack evaluator pops the two operand, a and b, ## and calls the function that is mapped to the operator with a and b as arguments. Thus, ## 'x + y' yields a call to addfunc(x,y). Each of the BIO functions checks the prefixes of its ## arguments to determine whether the operand is scalar, vector, or matrix. This information ## is used to generate appropriate C code. For scalars, this is essentially the input string, e.g. ## 'a + b*5' as input yields 'a + b*5' as output. For vectors and matrices, the input is translated to ## nested function calls, e.g. "V3_a + V3_b*5" yields "V3_vAdd(a,vScale(b,5)". Note that prefixes are ## stripped from operands and function names within the argument list to the outer function and ## the appropriate prefix is placed on the outer function for removal later as the stack evaluation ## recurses toward the final assignment statement. def _addfunc(a,b): if _isscalar(a) and _isscalar(b): return "(%s+%s)"%(a,b) if _isvec(a) and _isvec(b): return "%svAdd(%s,%s)"%(vprefix,a[vplen:],b[vplen:]) if _ismat(a) and _ismat(b): return "%smAdd(%s,%s)"%(mprefix,a[mplen:],b[mplen:]) else: raise TypeError def _subfunc(a,b): if _isscalar(a) and _isscalar(b): return "(%s-%s)"%(a,b) if _isvec(a) and _isvec(b): return "%svSubtract(%s,%s)"%(vprefix,a[vplen:],b[vplen:]) if _ismat(a) and _ismat(b): return "%smSubtract(%s,%s)"%(mprefix,a[mplen:],b[mplen:]) else: raise TypeError def _mulfunc(a,b): if _isscalar(a) and _isscalar(b): return "%s*%s"%(a,b) if _isvec(a) and _isvec(b): return "vDot(%s,%s)"%(a[vplen:],b[vplen:]) if _ismat(a) and _ismat(b): return "%smMultiply(%s,%s)"%(mprefix,a[mplen:],b[mplen:]) if _ismat(a) and _isvec(b): return "%smvMultiply(%s,%s)"%(vprefix,a[mplen:],b[vplen:]) if _ismat(a) and _isscalar(b): return "%smScale(%s,%s)"%(mprefix,a[mplen:],b) if _isvec(a) and _isscalar(b): return "%svScale(%s,%s)"%(vprefix,a[mplen:],b) else: raise TypeError def _outermulfunc(a,b): ## The '@' operator is used for the vector outer product. if _isvec(a) and _isvec(b): return "%svOuterProduct(%s,%s)"%(mprefix,a[vplen:],b[vplen:]) else: raise TypeError def _divfunc(a,b): ## The '/' operator is used only for scalar division if _isscalar(a) and _isscalar(b): return "%s/%s"%(a,b) else: raise TypeError def _expfunc(a,b): ## The '^' operator is used for exponentiation on scalars and ## as a marker for unary operations on vectors and matrices. if _isscalar(a) and _isscalar(b): return "pow(%s,%s)"%(str(a),str(b)) if _ismat(a) and b=='-1': return "%smInverse(%s)"%(mprefix,a[mplen:]) if _ismat(a) and b=='T': return "%smTranspose(%s)"%(mprefix,a[mplen:]) if _ismat(a) and b=='Det': return "mDeterminant(%s)"%(a[mplen:]) if _isvec(a) and b=='Mag': return "sqrt(vMagnitude2(%s))"%(a[vplen:]) if _isvec(a) and b=='Mag2': return "vMagnitude2(%s)"%(a[vplen:]) else: raise TypeError def _assignfunc(a,b): ## The '=' operator is used for assignment if _isscalar(a) and _isscalar(b): return "%s=%s"%(a,b) if _isvec(a) and _isvec(b): return "vCopy(%s,%s)"%(a[vplen:],b[vplen:]) if _ismat(a) and _ismat(b): return "mCopy(%s,%s)"%(a[mplen:],b[mplen:]) else: raise TypeError ## End of BIO func definitions ##---------------------------------------------------------------------------- # Map operator symbols to corresponding BIO funcs opn = { "+" : ( _addfunc ), "-" : ( _subfunc ), "*" : ( _mulfunc ), "@" : ( _outermulfunc ), "/" : ( _divfunc), "^" : ( _expfunc ), } ##---------------------------------------------------------------------------- # Recursive function that evaluates the expression stack def _evaluateStack( s ): op = s.pop() if op in "+-*/@^": op2 = _evaluateStack( s ) op1 = _evaluateStack( s ) result = opn[op]( op1, op2 ) if debug_flag: print(result) return result else: return op ##---------------------------------------------------------------------------- # The parse function that invokes all of the above. def parse(input_string): """ Accepts an input string containing an LA equation, e.g., "M3_mymatrix = M3_anothermatrix^-1" returns C code function calls that implement the expression. """ global exprStack global targetvar # Start with a blank exprStack and a blank targetvar exprStack = [] targetvar=None if input_string != '': # try parsing the input string try: L=equation.parseString( input_string ) except ParseException as err: print('Parse Failure', file=sys.stderr) print(err.line, file=sys.stderr) print(" "*(err.column-1) + "^", file=sys.stderr) print(err, file=sys.stderr) raise # show result of parsing the input string if debug_flag: print(input_string, "->", L) print("exprStack=", exprStack) # Evaluate the stack of parsed operands, emitting C code. try: result=_evaluateStack(exprStack) except TypeError: print("Unsupported operation on right side of '%s'.\nCheck for missing or incorrect tags on non-scalar operands."%input_string, file=sys.stderr) raise except UnaryUnsupportedError: print("Unary negation is not supported for vectors and matrices: '%s'"%input_string, file=sys.stderr) raise # Create final assignment and print it. if debug_flag: print("var=",targetvar) if targetvar != None: try: result = _assignfunc(targetvar,result) except TypeError: print("Left side tag does not match right side of '%s'"%input_string, file=sys.stderr) raise except UnaryUnsupportedError: print("Unary negation is not supported for vectors and matrices: '%s'"%input_string, file=sys.stderr) raise return result else: print("Empty left side in '%s'"%input_string, file=sys.stderr) raise TypeError ##----------------------------------------------------------------------------------- def fprocess(infilep,outfilep): """ Scans an input file for LA equations between double square brackets, e.g. [[ M3_mymatrix = M3_anothermatrix^-1 ]], and replaces the expression with a comment containing the equation followed by nested function calls that implement the equation as C code. A trailing semi-colon is appended. The equation within [[ ]] should NOT end with a semicolon as that will raise a ParseException. However, it is ok to have a semicolon after the right brackets. Other text in the file is unaltered. The arguments are file objects (NOT file names) opened for reading and writing, respectively. """ pattern = r'\[\[\s*(.*?)\s*\]\]' eqn = re.compile(pattern,re.DOTALL) s = infilep.read() def parser(mo): ccode = parse(mo.group(1)) return "/* %s */\n%s;\nLAParserBufferReset();\n"%(mo.group(1),ccode) content = eqn.sub(parser,s) outfilep.write(content) ##----------------------------------------------------------------------------------- def test(): """ Tests the parsing of various supported expressions. Raises an AssertError if the output is not what is expected. Prints the input, expected output, and actual output for all tests. """ print("Testing LAParser") testcases = [ ("Scalar addition","a = b+c","a=(b+c)"), ("Vector addition","V3_a = V3_b + V3_c","vCopy(a,vAdd(b,c))"), ("Vector addition","V3_a=V3_b+V3_c","vCopy(a,vAdd(b,c))"), ("Matrix addition","M3_a = M3_b + M3_c","mCopy(a,mAdd(b,c))"), ("Matrix addition","M3_a=M3_b+M3_c","mCopy(a,mAdd(b,c))"), ("Scalar subtraction","a = b-c","a=(b-c)"), ("Vector subtraction","V3_a = V3_b - V3_c","vCopy(a,vSubtract(b,c))"), ("Matrix subtraction","M3_a = M3_b - M3_c","mCopy(a,mSubtract(b,c))"), ("Scalar multiplication","a = b*c","a=b*c"), ("Scalar division","a = b/c","a=b/c"), ("Vector multiplication (dot product)","a = V3_b * V3_c","a=vDot(b,c)"), ("Vector multiplication (outer product)","M3_a = V3_b @ V3_c","mCopy(a,vOuterProduct(b,c))"), ("Matrix multiplication","M3_a = M3_b * M3_c","mCopy(a,mMultiply(b,c))"), ("Vector scaling","V3_a = V3_b * c","vCopy(a,vScale(b,c))"), ("Matrix scaling","M3_a = M3_b * c","mCopy(a,mScale(b,c))"), ("Matrix by vector multiplication","V3_a = M3_b * V3_c","vCopy(a,mvMultiply(b,c))"), ("Scalar exponentiation","a = b^c","a=pow(b,c)"), ("Matrix inversion","M3_a = M3_b^-1","mCopy(a,mInverse(b))"), ("Matrix transpose","M3_a = M3_b^T","mCopy(a,mTranspose(b))"), ("Matrix determinant","a = M3_b^Det","a=mDeterminant(b)"), ("Vector magnitude squared","a = V3_b^Mag2","a=vMagnitude2(b)"), ("Vector magnitude","a = V3_b^Mag","a=sqrt(vMagnitude2(b))"), ("Complicated expression", "myscalar = (M3_amatrix * V3_bvector)^Mag + 5*(-xyz[i] + 2.03^2)","myscalar=(sqrt(vMagnitude2(mvMultiply(amatrix,bvector)))+5*(-xyz[i]+pow(2.03,2)))"), ("Complicated Multiline", "myscalar = \n(M3_amatrix * V3_bvector)^Mag +\n 5*(xyz + 2.03^2)","myscalar=(sqrt(vMagnitude2(mvMultiply(amatrix,bvector)))+5*(xyz+pow(2.03,2)))") ] for t in testcases: name,input,expected = t print(name) print(" %s input"%input) print(" %s expected"%expected) result = parse(input) print(" %s received"%result) print("") assert expected == result ##TODO: Write testcases with invalid expressions and test that the expected ## exceptions are raised. print("Tests completed!") ##---------------------------------------------------------------------------- ## The following is executed only when this module is executed as ## command line script. It runs a small test suite (see above) ## and then enters an interactive loop where you ## can enter expressions and see the resulting C code as output. if __name__ == '__main__': # run testcases test() # input_string input_string='' # Display instructions on how to use the program interactively interactiveusage = """ Entering interactive mode: Type in an equation to be parsed or 'quit' to exit the program. Type 'debug on' to print parsing details as each string is processed. Type 'debug off' to stop printing parsing details """ print(interactiveusage) input_string = input("> ") while input_string != 'quit': if input_string == "debug on": debug_flag = True elif input_string == "debug off": debug_flag = False else: try: print(parse(input_string)) except: pass # obtain new input string input_string = input("> ") # if user types 'quit' then say goodbye print("Good bye!") pyparsing-2.1.10/examples/linenoExample.py0000666000000000000000000000277312466013312016740 0ustar 00000000000000# # linenoExample.py # # an example of using the location value returned by pyparsing to # extract the line and column number of the location of the matched text, # or to extract the entire line of text. # # Copyright (c) 2006, Paul McGuire # from pyparsing import * data = """Now is the time for all good men to come to the aid of their country.""" # demonstrate use of lineno, line, and col in a parse action def reportLongWords(st,locn,toks): word = toks[0] if len(word) > 3: print("Found '%s' on line %d at column %d" % (word, lineno(locn,st), col(locn,st))) print("The full line of text was:") print("'%s'" % line(locn,st)) print((" "*col(locn,st))+" ^") print() wd = Word(alphas).setParseAction( reportLongWords ) OneOrMore(wd).parseString(data) # demonstrate returning an object from a parse action, containing more information # than just the matching token text class Token(object): def __init__(self, st, locn, tokString): self.tokenString = tokString self.locn = locn self.sourceLine = line(locn,st) self.lineNo = lineno(locn,st) self.col = col(locn,st) def __str__(self): return "%(tokenString)s (line: %(lineNo)d, col: %(col)d)" % self.__dict__ def createTokenObject(st,locn,toks): return Token(st,locn, toks[0]) wd = Word(alphas).setParseAction( createTokenObject ) for tokenObj in OneOrMore(wd).parseString(data): print(tokenObj) pyparsing-2.1.10/examples/list1.py0000666000000000000000000000320212752435271015172 0ustar 00000000000000# # list1.py # # an example of using parse actions to convert type of parsed data. # # Copyright (c) 2006-2016, Paul McGuire # from pyparsing import * # first pass lbrack = Literal("[") rbrack = Literal("]") integer = Word(nums).setName("integer") real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." + Optional(Word(nums))).setName("real") listItem = real | integer | quotedString listStr = lbrack + delimitedList(listItem) + rbrack test = "['a', 100, 3.14]" print(listStr.parseString(test)) # second pass, cleanup and add converters lbrack = Literal("[").suppress() rbrack = Literal("]").suppress() cvtInt = lambda s,l,toks: int(toks[0]) cvtReal = lambda s,l,toks: float(toks[0]) integer = Word(nums).setName("integer").setParseAction( cvtInt ) real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." + Optional(Word(nums))).setName("real").setParseAction( cvtReal ) listItem = real | integer | quotedString.setParseAction( removeQuotes ) listStr = lbrack + delimitedList(listItem) + rbrack test = "['a', 100, 3.14]" print(listStr.parseString(test)) # third pass, add nested list support lbrack, rbrack = map(Suppress, "[]") cvtInt = tokenMap(int) cvtReal = tokenMap(float) integer = Word(nums).setName("integer").setParseAction( cvtInt ) real = Regex(r"[+-]?\d+\.\d*").setName("real").setParseAction( cvtReal ) listStr = Forward() listItem = real | integer | quotedString.setParseAction(removeQuotes) | Group(listStr) listStr << lbrack + delimitedList(listItem) + rbrack test = "['a', 100, 3.14, [ +2.718, 'xyzzy', -1.414] ]" print(listStr.parseString(test))pyparsing-2.1.10/examples/listAllMatches.py0000666000000000000000000000312012641075634017046 0ustar 00000000000000# listAllMatches.py # # Sample program showing how/when to use listAllMatches to get all matching tokens in a results name. # # copyright 2006, Paul McGuire # from pyparsing import oneOf, OneOrMore, printables, StringEnd test = "The quick brown fox named 'Aloysius' lives at 123 Main Street (and jumps over lazy dogs in his spare time)." nonAlphas = [ c for c in printables if not c.isalpha() ] print("Extract vowels, consonants, and special characters from this test string:") print("'" + test + "'") print('') print("Define grammar using normal results names") print("(only last matching symbol is saved)") vowels = oneOf(list("aeiouy"), caseless=True)("vowels") cons = oneOf(list("bcdfghjklmnpqrstvwxz"), caseless=True)("cons") other = oneOf(nonAlphas)("others") letters = OneOrMore(cons | vowels | other) + StringEnd() results = letters.parseString(test) print(results) print(results.vowels) print(results.cons) print(results.others) print('') print("Define grammar using results names, with listAllMatches=True") print("(all matching symbols are saved)") vowels = oneOf(list("aeiouy"), caseless=True)("vowels*") cons = oneOf(list("bcdfghjklmnpqrstvwxz"), caseless=True)("cons*") other = oneOf(nonAlphas)("others*") letters = OneOrMore(cons | vowels | other) results = letters.parseString(test, parseAll=True) print(results) print(sorted(set(results))) print('') print(results.vowels) print(sorted(set(results.vowels))) print('') print(results.cons) print(sorted(set(results.cons))) print('') print(results.others) print(sorted(set(results.others))) pyparsing-2.1.10/examples/lucene_grammar.py0000666000000000000000000001557612771530173017136 0ustar 00000000000000# # lucene_grammar.py # # Copyright 2011, Paul McGuire # # implementation of Lucene grammar, as decribed # at http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/docs/queryparsersyntax.html # from pyparsing import (Literal, CaselessKeyword, Forward, Regex, QuotedString, Suppress, Optional, Group, FollowedBy, infixNotation, opAssoc, ParseException, ParserElement, pyparsing_common) ParserElement.enablePackrat() COLON,LBRACK,RBRACK,LBRACE,RBRACE,TILDE,CARAT = map(Literal,":[]{}~^") LPAR,RPAR = map(Suppress,"()") and_, or_, not_, to_ = map(CaselessKeyword, "AND OR NOT TO".split()) keyword = and_ | or_ | not_ | to_ expression = Forward() valid_word = Regex(r'([a-zA-Z0-9*_+.-]|\\[!(){}\[\]^"~*?\\:])+').setName("word") valid_word.setParseAction( lambda t : t[0].replace('\\\\',chr(127)).replace('\\','').replace(chr(127),'\\') ) string = QuotedString('"') required_modifier = Literal("+")("required") prohibit_modifier = Literal("-")("prohibit") integer = Regex(r"\d+").setParseAction(lambda t:int(t[0])) proximity_modifier = Group(TILDE + integer("proximity")) number = pyparsing_common.fnumber() fuzzy_modifier = TILDE + Optional(number, default=0.5)("fuzzy") term = Forward() field_name = valid_word().setName("fieldname") incl_range_search = Group(LBRACK + term("lower") + to_ + term("upper") + RBRACK) excl_range_search = Group(LBRACE + term("lower") + to_ + term("upper") + RBRACE) range_search = incl_range_search("incl_range") | excl_range_search("excl_range") boost = (CARAT + number("boost")) string_expr = Group(string + proximity_modifier) | string word_expr = Group(valid_word + fuzzy_modifier) | valid_word term << (Optional(field_name("field") + COLON) + (word_expr | string_expr | range_search | Group(LPAR + expression + RPAR)) + Optional(boost)) term.setParseAction(lambda t:[t] if 'field' in t or 'boost' in t else None) expression << infixNotation(term, [ (required_modifier | prohibit_modifier, 1, opAssoc.RIGHT), ((not_ | '!').setParseAction(lambda: "NOT"), 1, opAssoc.RIGHT), ((and_ | '&&').setParseAction(lambda: "AND"), 2, opAssoc.LEFT), (Optional(or_ | '||').setParseAction(lambda: "OR"), 2, opAssoc.LEFT), ]) # test strings taken from grammar description doc, and TestQueryParser.java tests = r""" a and b a and not b a and !b a && !b a&&!b name:a name:a and not title:b (a^100 c d f) and !z name:"blah de blah" title:(+return +"pink panther") title:"The Right Way" AND text:go title:"Do it right" AND right title:Do it right roam~ roam~0.8 "jakarta apache"~10 mod_date:[20020101 TO 20030101] title:{Aida TO Carmen} jakarta apache jakarta^4 apache "jakarta apache"^4 "Apache Lucene" "jakarta apache" jakarta "jakarta apache" OR jakarta "jakarta apache" AND "Apache Lucene" +jakarta lucene "jakarta apache" NOT "Apache Lucene" "jakarta apache" -"Apache Lucene" (jakarta OR apache) AND website \(1+1\)\:2 c\:\\windows (fieldX:xxxxx OR fieldy:xxxxxxxx)^2 AND (fieldx:the OR fieldy:foo) (fieldX:xxxxx fieldy:xxxxxxxx)^2 AND (fieldx:the fieldy:foo) (fieldX:xxxxx~0.5 fieldy:xxxxxxxx)^2 AND (fieldx:the fieldy:foo) +term -term term foo:term AND field:anotherTerm germ term^2.0 (term)^2.0 (foo OR bar) AND (baz OR boo) +(apple \"steve jobs\") -(foo bar baz) +title:(dog OR cat) -author:\"bob dole\" a AND b +a +b (a AND b) c OR (a AND b) c (+a +b) a AND NOT b +a -b a AND -b a AND !b a && b a && ! b a OR b a b a || b a OR !b a -b a OR ! b a OR -b a - b a + b a ! b +foo:term +anotherterm hello term^2.0 (germ term)^2.0 term^2 +(foo bar) +(baz boo) ((a OR b) AND NOT c) OR d (+(a b) -c) d field a&&b .NET term germ 3 term 1.0 1 2 term term1 term2 term term term term* term*^2 term*^2.0 term~ term~2.0 term~0.7 term~^3 term~2.0^3.0 term*germ term*germ^3 term*germ^3.0 term~1.1 [A TO C] t*erm* *term* term term^3.0 term term stop^3.0 term term +stop term term -stop term drop AND (stop) AND roll +drop +roll term +(stop) term term -(stop) term drop AND stop AND roll term phrase term term (phrase1 phrase2) term term AND NOT phrase term +term -(phrase1 phrase2) term stop^3 stop (stop)^3 ((stop))^3 (stop^3) ((stop)^3) (stop) ((stop)) term +stop [ a TO z] [a TO z] [ a TO z ] { a TO z} {a TO z} { a TO z } { a TO z }^2.0 {a TO z}^2.0 [ a TO z] OR bar [a TO z] bar [ a TO z] AND bar +[a TO z] +bar ( bar blar { a TO z}) bar blar {a TO z} gack ( bar blar { a TO z}) gack (bar blar {a TO z}) [* TO Z] [* TO z] [A TO *] [a TO *] [* TO *] [\* TO \*] \!blah \:blah blah \~blah \*blah a a-b:c a+b:c a\:b:c a\\b:c a:b-c a:b+c a:b\:c a:b\\c a:b-c* a:b+c* a:b\:c* a:b\\c* a:b-c~2.0 a:b+c~2.0 a:b\:c~ a:b\\c~ [a- TO a+] [ a\\ TO a\* ] c\:\\temp\\\~foo.txt abc XYZ (item:\\ item:ABCD\\) \* * \\ a\:b\:c a\\b\:c a\:b\\c a\:b\:c\* a\:b\\\\c\* a:b-c~ a:b+c~ a\:b\:c\~ a\:b\\c\~ +weltbank +worlbank +term +term +term term +term term term term +term term +term +term -term term term -term +term +term on on^1.0 hello^2.0 the^3 the some phrase xunit~ one two three A AND B OR C AND D +A +B +C +D foo:zoo* foo:zoo*^2 zoo foo:* foo:*^2 *:foo a:the OR a:foo a:woo OR a:the *:* (*:*) +*:* -*:* the wizard of ozzy """ failtests = r""" field:term:with:colon some more terms (sub query)^5.0^2.0 plus more a:b:c a:b:c~ a:b:c* a:b:c~2.0 \+blah \-blah foo \|| bar foo \AND bar \a a\-b:c a\+b:c a\b:c a:b\-c a:b\+c a\-b\:c a\+b\:c a:b\c* a:b\-c~ a:b\+c~ a:b\c a:b\-c* a:b\+c* [ a\- TO a\+ ] [a\ TO a*] a\\\+b a\+b c:\temp\~foo.txt XY\ a\u0062c a:b\c~2.0 XY\u005a XY\u005A item:\ item:ABCD\ \ a\ or b a\:b\-c a\:b\+c a\:b\-c\* a\:b\+c\* a\:b\-c\~ a\:b\+c\~ a:b\c~ [ a\ TO a* ] """ success1, _ = expression.runTests(tests) success2, _ = expression.runTests(failtests, failureTests=True) print(("FAIL", "OK")[success1 and success2]) pyparsing-2.1.10/examples/macroExpander.py0000666000000000000000000000344712641074630016734 0ustar 00000000000000# macroExpander.py # # Example pyparsing program for performing macro expansion, similar to # the C pre-processor. This program is not as fully-featured, simply # processing macros of the form: # #def xxx yyyyy # and replacing xxx with yyyyy in the rest of the input string. Macros # can also be composed using other macros, such as # #def zzz xxx+1 # Since xxx was previously defined as yyyyy, then zzz will be replaced # with yyyyy+1. # # Copyright 2007 by Paul McGuire # from pyparsing import * # define the structure of a macro definition (the empty term is used # to advance to the next non-whitespace character) identifier = Word(alphas+"_",alphanums+"_") macroDef = "#def" + identifier("macro") + empty + restOfLine("value") # define a placeholder for defined macros - initially nothing macroExpr = Forward() macroExpr << NoMatch() # global dictionary for macro definitions macros = {} # parse action for macro definitions def processMacroDefn(s,l,t): macroVal = macroExpander.transformString(t.value) macros[t.macro] = macroVal macroExpr << MatchFirst(map(Keyword, macros.keys())) return "#def " + t.macro + " " + macroVal # parse action to replace macro references with their respective definition def processMacroRef(s,l,t): return macros[t[0]] # attach parse actions to expressions macroExpr.setParseAction(processMacroRef) macroDef.setParseAction(processMacroDefn) # define pattern for scanning through the input string macroExpander = macroExpr | macroDef # test macro substitution using transformString testString = """ #def A 100 #def ALEN A+1 char Astring[ALEN]; char AA[A]; typedef char[ALEN] Acharbuf; """ print(macroExpander.transformString(testString)) print(macros) pyparsing-2.1.10/examples/makeHTMLTagExample.py0000666000000000000000000000143412466013312017503 0ustar 00000000000000import urllib.request, urllib.parse, urllib.error from pyparsing import makeHTMLTags, SkipTo # read HTML from a web page serverListPage = urllib.request.urlopen( "http://www.yahoo.com" ) htmlText = serverListPage.read() serverListPage.close() # using makeHTMLTags to define opening and closing tags anchorStart,anchorEnd = makeHTMLTags("a") # compose an expression for an anchored reference anchor = anchorStart + SkipTo(anchorEnd)("body") + anchorEnd # use scanString to scan through the HTML source, extracting # just the anchor tags and their associated body text # (note the href attribute of the opening A tag is available # as an attribute in the returned parse results) for tokens,start,end in anchor.scanString(htmlText): print(tokens.body,'->',tokens.href) pyparsing-2.1.10/examples/matchPreviousDemo.py0000666000000000000000000000111312466013312017561 0ustar 00000000000000# # matchPreviousDemo.py # from pyparsing import * src = """ class a ... end a; class b ... end b; class c ... end d;""" identifier = Word(alphas) classIdent = identifier("classname") # note that this also makes a copy of identifier classHead = "class" + classIdent classBody = "..." classEnd = "end" + matchPreviousLiteral(classIdent) + ';' classDefn = classHead + classBody + classEnd # use this form to catch syntax error # classDefn = classHead + classBody - classEnd for tokens in classDefn.searchString(src): print(tokens.classname)pyparsing-2.1.10/examples/mozilla.ics0000666000000000000000000000136012466013312015724 0ustar 00000000000000BEGIN:VCALENDAR VERSION :2.0 PRODID :-//Mozilla.org/NONSGML Mozilla Calendar V1.0//EN METHOD :PUBLISH BEGIN:VEVENT UID :153ed0e0-1dd2-11b2-9d71-96da104537a4 SUMMARY :Test event DESCRIPTION :Some notes LOCATION :Somewhere over the rainbow CATEGORIES :Personal URL :http://personal.amec.fi STATUS :CONFIRMED CLASS :PRIVATE X ;MEMBER=AlarmEmailAddress :petri.savolainen@iki.fi X-MOZILLA-RECUR-DEFAULT-UNITS :months RRULE :FREQ=MONTHLY;UNTIL=20040914;INTERVAL=1 EXDATE :20040714T000000 DTSTART ;VALUE=DATE :20040714 DTEND ;VALUE=DATE :20040815 DTSTAMP :20040714T141219Z LAST-MODIFIED :20040714T141457Z BEGIN:VALARM TRIGGER ;VALUE=DURATION :PT15M END:VALARM END:VEVENT END:VCALENDAR pyparsing-2.1.10/examples/mozillaCalendarParser.py0000666000000000000000000000510312641073603020410 0ustar 00000000000000from pyparsing import Optional, oneOf, Dict, Literal, Word, printables, Group, OneOrMore, ZeroOrMore """ A simple parser for calendar (*.ics) files, as exported by the Mozilla calendar. Any suggestions and comments welcome. Version: 0.1 Copyright: Petri Savolainen License: Free for any use """ # TERMINALS BEGIN = Literal("BEGIN:").suppress() END = Literal("END:").suppress() valstr = printables + "\xe4\xf6\xe5\xd6\xc4\xc5 " EQ = Literal("=").suppress() SEMI = Literal(";").suppress() COLON = Literal(":").suppress() EVENT = Literal("VEVENT").suppress() CALENDAR = Literal("VCALENDAR").suppress() ALARM = Literal("VALARM").suppress() # TOKENS CALPROP = oneOf("VERSION PRODID METHOD") ALMPROP = oneOf("TRIGGER") EVTPROP = oneOf("X-MOZILLA-RECUR-DEFAULT-INTERVAL \ X-MOZILLA-RECUR-DEFAULT-UNITS \ UID DTSTAMP LAST-MODIFIED X RRULE EXDATE") propval = Word(valstr) typeval = Word(valstr) typename = oneOf("VALUE MEMBER FREQ UNTIL INTERVAL") proptype = Group(SEMI + typename + EQ + typeval).suppress() calprop = Group(CALPROP + ZeroOrMore(proptype) + COLON + propval) almprop = Group(ALMPROP + ZeroOrMore(proptype) + COLON + propval) evtprop = Group(EVTPROP + ZeroOrMore(proptype) + COLON + propval).suppress() \ | "CATEGORIES" + COLON + propval.setResultsName("categories") \ | "CLASS" + COLON + propval.setResultsName("class") \ | "DESCRIPTION" + COLON + propval.setResultsName("description") \ | "DTSTART" + proptype + COLON + propval.setResultsName("begin") \ | "DTEND" + proptype + COLON + propval.setResultsName("end") \ | "LOCATION" + COLON + propval.setResultsName("location") \ | "PRIORITY" + COLON + propval.setResultsName("priority") \ | "STATUS" + COLON + propval.setResultsName("status") \ | "SUMMARY" + COLON + propval.setResultsName("summary") \ | "URL" + COLON + propval.setResultsName("url") \ calprops = Group(OneOrMore(calprop)).suppress() evtprops = Group(OneOrMore(evtprop)) almprops = Group(OneOrMore(almprop)).suppress() alarm = BEGIN + ALARM + almprops + END + ALARM event = BEGIN + EVENT + evtprops + Optional(alarm) + END + EVENT events = Group(OneOrMore(event)) calendar = BEGIN + CALENDAR + calprops + ZeroOrMore(event) + END + CALENDAR calendars = OneOrMore(calendar) # PARSE ACTIONS def gotEvent(s,loc,toks): for event in toks: print(event.dump()) event.setParseAction(gotEvent) # MAIN PROGRAM if __name__=="__main__": calendars.parseFile("mozilla.ics") pyparsing-2.1.10/examples/nested.py0000666000000000000000000000114112466013312015406 0ustar 00000000000000# # nested.py # Copyright, 2007 - Paul McGuire # # Simple example of using nestedExpr to define expressions using # paired delimiters for grouping lists and sublists # from pyparsing import * import pprint data = """ { { item1 "item with } in it" } { {item2a item2b } {item3} } } """ # use {}'s for nested lists nestedItems = nestedExpr("{", "}") print(( (nestedItems+stringEnd).parseString(data).asList() )) # use default delimiters of ()'s mathExpr = nestedExpr() print(( mathExpr.parseString( "((( ax + by)*C) *(Z | (E^F) & D))") )) pyparsing-2.1.10/examples/numerics.py0000666000000000000000000000253412721227677015777 0ustar 00000000000000# # numerics.py # # Examples of parsing real and integers using various grouping and # decimal point characters, varying by locale. # # Copyright 2016, Paul McGuire # # Format samples from https://docs.oracle.com/cd/E19455-01/806-0169/overview-9/index.html # tests = """\ # Canadian (English and French) 4 294 967 295,000 # Danish 4 294 967 295,000 # Finnish 4 294 967 295,000 # French 4 294 967 295,000 # German 4 294 967 295,000 # Italian 4.294.967.295,000 # Norwegian 4.294.967.295,000 # Spanish 4.294.967.295,000 # Swedish 4 294 967 295,000 # GB-English 4,294,967,295.000 # US-English 4,294,967,295.000 # Thai 4,294,967,295.000 """ from pyparsing import Regex comma_decimal = Regex(r'\d{1,2}(([ .])\d\d\d(\2\d\d\d)*)?,\d*') comma_decimal.setParseAction(lambda t: float(t[0].replace(' ','').replace('.','').replace(',','.'))) dot_decimal = Regex(r'\d{1,2}(([ ,])\d\d\d(\2\d\d\d)*)?\.\d*') dot_decimal.setParseAction(lambda t: float(t[0].replace(' ','').replace(',',''))) decimal = comma_decimal ^ dot_decimal decimal.runTests(tests, parseAll=True) grouped_integer = Regex(r'\d{1,2}(([ .,])\d\d\d(\2\d\d\d)*)?') grouped_integer.setParseAction(lambda t: int(t[0].replace(' ','').replace(',','').replace('.',''))) grouped_integer.runTests(tests, parseAll=False) pyparsing-2.1.10/examples/oc.py0000666000000000000000000000766712771530535014562 0ustar 00000000000000# oc.py # # A subset-C parser, (BNF taken from 1996 International Obfuscated C Code Contest) # # Copyright, 2010, Paul McGuire # """ http://www.ioccc.org/1996/august.hint The following is a description of the OC grammar: OC grammar ========== Terminals are in quotes, () is used for bracketing. program: decl* decl: vardecl fundecl vardecl: type NAME ; type NAME "[" INT "]" ; fundecl: type NAME "(" args ")" "{" body "}" args: /*empty*/ ( arg "," )* arg arg: type NAME body: vardecl* stmt* stmt: ifstmt whilestmt dowhilestmt "return" expr ";" expr ";" "{" stmt* "}" ";" ifstmt: "if" "(" expr ")" stmt "if" "(" expr ")" stmt "else" stmt whilestmt: "while" "(" expr ")" stmt dowhilestmt: "do" stmt "while" "(" expr ")" ";" expr: expr binop expr unop expr expr "[" expr "]" "(" expr ")" expr "(" exprs ")" NAME INT CHAR STRING exprs: /*empty*/ (expr ",")* expr binop: "+" | "-" | "*" | "/" | "%" | "=" | "<" | "==" | "!=" unop: "!" | "-" | "*" type: "int" stars "char" stars stars: "*"* """ from pyparsing import * LPAR,RPAR,LBRACK,RBRACK,LBRACE,RBRACE,SEMI,COMMA = map(Suppress, "()[]{};,") INT, CHAR, WHILE, DO, IF, ELSE, RETURN = map(Keyword, "int char while do if else return".split()) NAME = Word(alphas+"_", alphanums+"_") integer = Regex(r"[+-]?\d+") char = Regex(r"'.'") string_ = dblQuotedString TYPE = Group((INT | CHAR) + ZeroOrMore("*")) expr = Forward() operand = NAME | integer | char | string_ expr << (infixNotation(operand, [ (oneOf('! - *'), 1, opAssoc.RIGHT), (oneOf('++ --'), 1, opAssoc.RIGHT), (oneOf('++ --'), 1, opAssoc.LEFT), (oneOf('* / %'), 2, opAssoc.LEFT), (oneOf('+ -'), 2, opAssoc.LEFT), (oneOf('< == > <= >= !='), 2, opAssoc.LEFT), (Regex(r'=[^=]'), 2, opAssoc.LEFT), ]) + Optional( LBRACK + expr + RBRACK | LPAR + Group(Optional(delimitedList(expr))) + RPAR ) ) stmt = Forward() ifstmt = IF - LPAR + expr + RPAR + stmt + Optional(ELSE + stmt) whilestmt = WHILE - LPAR + expr + RPAR + stmt dowhilestmt = DO - stmt + WHILE + LPAR + expr + RPAR + SEMI returnstmt = RETURN - expr + SEMI stmt << Group( ifstmt | whilestmt | dowhilestmt | returnstmt | expr + SEMI | LBRACE + ZeroOrMore(stmt) + RBRACE | SEMI) vardecl = Group(TYPE + NAME + Optional(LBRACK + integer + RBRACK)) + SEMI arg = Group(TYPE + NAME) body = ZeroOrMore(vardecl) + ZeroOrMore(stmt) fundecl = Group(TYPE + NAME + LPAR + Optional(Group(delimitedList(arg))) + RPAR + LBRACE + Group(body) + RBRACE) decl = fundecl | vardecl program = ZeroOrMore(decl) program.ignore(cStyleComment) # set parser element names for vname in ("ifstmt whilestmt dowhilestmt returnstmt TYPE " "NAME fundecl vardecl program arg body stmt".split()): v = vars()[vname] v.setName(vname) #~ for vname in "fundecl stmt".split(): #~ v = vars()[vname] #~ v.setDebug() test = r""" /* A factorial program */ int putstr(char *s) { while(*s) putchar(*s++); } int fac(int n) { if (n == 0) return 1; else return n*fac(n-1); } int putn(int n) { if (9 < n) putn(n / 10); putchar((n%10) + '0'); } int facpr(int n) { putstr("factorial "); putn(n); putstr(" = "); putn(fac(n)); putstr("\n"); } int main() { int i; i = 0; while(i < 10) facpr(i++); return 0; } """ ast = program.parseString(test, parseAll=True) ast.pprint() pyparsing-2.1.10/examples/parseListString.py0000666000000000000000000000617712641067236017310 0ustar 00000000000000# parseListString.py # # Copyright, 2006, by Paul McGuire # from pyparsing import * # first pass lbrack = Literal("[") rbrack = Literal("]") integer = Word(nums).setName("integer") real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." + Optional(Word(nums))).setName("real") listItem = real | integer | quotedString listStr = lbrack + delimitedList(listItem) + rbrack test = "['a', 100, 3.14]" print(listStr.parseString(test)) # second pass, cleanup and add converters lbrack = Literal("[").suppress() rbrack = Literal("]").suppress() cvtInt = lambda s,l,toks: int(toks[0]) integer = Word(nums).setName("integer").setParseAction( cvtInt ) cvtReal = lambda s,l,toks: float(toks[0]) real = Regex(r'[+-]?\d+\.\d*').setName("floating-point number").setParseAction( cvtReal ) listItem = real | integer | quotedString.setParseAction( removeQuotes ) listStr = lbrack + delimitedList(listItem) + rbrack test = "['a', 100, 3.14]" print(listStr.parseString(test)) # third pass, add nested list support, and tuples, too! cvtInt = lambda s,l,toks: int(toks[0]) cvtReal = lambda s,l,toks: float(toks[0]) lbrack = Literal("[").suppress() rbrack = Literal("]").suppress() integer = Word(nums).setName("integer").setParseAction( cvtInt ) real = Regex(r'[+-]?\d+\.\d*').setName("floating-point number").setParseAction( cvtReal ) tupleStr = Forward() listStr = Forward() listItem = real | integer | quotedString.setParseAction(removeQuotes) | Group(listStr) | tupleStr tupleStr << ( Suppress("(") + delimitedList(listItem) + Optional(Suppress(",")) + Suppress(")") ) tupleStr.setParseAction( lambda t:tuple(t.asList()) ) listStr << lbrack + delimitedList(listItem) + Optional(Suppress(",")) + rbrack test = "['a', 100, ('A', [101,102]), 3.14, [ +2.718, 'xyzzy', -1.414] ]" print(listStr.parseString(test)) # fourth pass, add parsing of dicts cvtInt = lambda s,l,toks: int(toks[0]) cvtReal = lambda s,l,toks: float(toks[0]) cvtDict = lambda s,l,toks: dict(toks[0]) lbrack = Literal("[").suppress() rbrack = Literal("]").suppress() lbrace = Literal("{").suppress() rbrace = Literal("}").suppress() colon = Literal(":").suppress() integer = Word(nums).setName("integer").setParseAction( cvtInt ) real = Regex(r'[+-]?\d+\.\d*').setName("real").setParseAction( cvtReal ) tupleStr = Forward() listStr = Forward() dictStr = Forward() listItem = real | integer | quotedString.setParseAction(removeQuotes) | Group(listStr) | tupleStr | dictStr tupleStr <<= ( Suppress("(") + delimitedList(listItem) + Optional(Suppress(",")) + Suppress(")") ) tupleStr.setParseAction( lambda t:tuple(t.asList()) ) listStr <<= (lbrack + Optional(delimitedList(listItem)) + Optional(Suppress(",")) + rbrack) dictKeyStr = real | integer | quotedString.setParseAction(removeQuotes) dictStr <<= lbrace + Optional(delimitedList( Group( dictKeyStr + colon + listItem ))) + Optional(Suppress(",")) + rbrace dictStr.setParseAction(lambda t: dict((k_v[0],(k_v[1].asList() if isinstance(k_v[1],ParseResults) else k_v[1])) for k_v in t)) test = '[{0: [2], 1: []}, {0: [], 1: [], 2: [,]}, {0: [1, 2,],}]' print(listStr.parseString(test)) pyparsing-2.1.10/examples/parsePythonValue.py0000666000000000000000000000436712466013312017452 0ustar 00000000000000# parsePythonValue.py # # Copyright, 2006, by Paul McGuire # from __future__ import print_function from pyparsing import * cvtBool = lambda t:t[0]=='True' cvtInt = lambda toks: int(toks[0]) cvtReal = lambda toks: float(toks[0]) cvtTuple = lambda toks : tuple(toks.asList()) cvtDict = lambda toks: dict(toks.asList()) cvtList = lambda toks: [toks.asList()] # define punctuation as suppressed literals lparen,rparen,lbrack,rbrack,lbrace,rbrace,colon = \ map(Suppress,"()[]{}:") integer = Regex(r"[+-]?\d+")\ .setName("integer")\ .setParseAction( cvtInt ) real = Regex(r"[+-]?\d+\.\d*([Ee][+-]?\d+)?")\ .setName("real")\ .setParseAction( cvtReal ) tupleStr = Forward() listStr = Forward() dictStr = Forward() unicodeString.setParseAction(lambda t:t[0][2:-1].decode('unicode-escape')) quotedString.setParseAction(lambda t:t[0][1:-1].decode('string-escape')) boolLiteral = oneOf("True False").setParseAction(cvtBool) noneLiteral = Literal("None").setParseAction(replaceWith(None)) listItem = real|integer|quotedString|unicodeString|boolLiteral|noneLiteral| \ Group(listStr) | tupleStr | dictStr tupleStr << ( Suppress("(") + Optional(delimitedList(listItem)) + Optional(Suppress(",")) + Suppress(")") ) tupleStr.setParseAction( cvtTuple ) listStr << (lbrack + Optional(delimitedList(listItem) + Optional(Suppress(","))) + rbrack) listStr.setParseAction(cvtList, lambda t: t[0]) dictEntry = Group( listItem + colon + listItem ) dictStr << (lbrace + Optional(delimitedList(dictEntry) + \ Optional(Suppress(","))) + rbrace) dictStr.setParseAction( cvtDict ) tests = """['a', 100, ('A', [101,102]), 3.14, [ +2.718, 'xyzzy', -1.414] ] [{0: [2], 1: []}, {0: [], 1: [], 2: []}, {0: [1, 2]}] { 'A':1, 'B':2, 'C': {'a': 1.2, 'b': 3.4} } 3.14159 42 6.02E23 6.02e+023 1.0e-7 'a quoted string'""".split("\n") for test in tests: print("Test:", test.strip()) result = listItem.parseString(test)[0] print("Result:", result) try: for dd in result: if isinstance(dd,dict): print(list(dd.items())) except TypeError as te: pass print() pyparsing-2.1.10/examples/parseResultsSumExample.py0000666000000000000000000000147312466013312020631 0ustar 00000000000000# # parseResultsSumExample.py # # Sample script showing the value in merging ParseResults retrieved by searchString, # using Python's builtin sum() method # samplestr1 = "garbage;DOB 10-10-2010;more garbage\nID PARI12345678;more garbage" samplestr2 = "garbage;ID PARI12345678;more garbage\nDOB 10-10-2010;more garbage" samplestr3 = "garbage;DOB 10-10-2010" samplestr4 = "garbage;ID PARI12345678;more garbage- I am cool" from pyparsing import * dob_ref = "DOB" + Regex(r"\d{2}-\d{2}-\d{4}")("dob") id_ref = "ID" + Word(alphanums,exact=12)("id") info_ref = "-" + restOfLine("info") person_data = dob_ref | id_ref | info_ref for test in (samplestr1,samplestr2,samplestr3,samplestr4,): person = sum(person_data.searchString(test)) print(person.id) print(person.dump()) print() pyparsing-2.1.10/examples/parseTabularData.py0000666000000000000000000000326412641053622017356 0ustar 00000000000000# # parseTabularData.py # # Example of parsing data that is formatted in a tabular listing, with # potential for missing values. Uses new addCondition method on # ParserElements. # # Copyright 2015, Paul McGuire # from pyparsing import col,Word,Optional,alphas,nums,ParseException table = """\ 1 2 12345678901234567890 COLOR S M L RED 10 2 2 BLUE 5 10 GREEN 3 5 PURPLE 8""" # function to create column-specific parse conditions def mustMatchCols(startloc,endloc): return lambda s,l,t: startloc <= col(l,s) <= endloc # helper to define values in a space-delimited table # (change empty_cell_is_zero to True if a value of 0 is desired for empty cells) def tableValue(expr, colstart, colend): empty_cell_is_zero = False if empty_cell_is_zero: return Optional(expr.copy().addCondition(mustMatchCols(colstart,colend), message="text not in expected columns"), default=0) else: return Optional(expr.copy().addCondition(mustMatchCols(colstart,colend), message="text not in expected columns")) # define the grammar for this simple table colorname = Word(alphas) integer = Word(nums).setParseAction(lambda t: int(t[0])).setName("integer") row = (colorname("name") + tableValue(integer, 11, 12)("S") + tableValue(integer, 15, 16)("M") + tableValue(integer, 19, 20)("L")) # parse the sample text - skip over the header and counter lines for line in table.splitlines()[3:]: print(line) print(row.parseString(line).dump()) print('') pyparsing-2.1.10/examples/partial_gene_match.py0000666000000000000000000000635612466013312017747 0ustar 00000000000000# parital_gene_match.py # # Example showing how to create a customized pyparsing Token, in this case, # one that is very much like Literal, but which tolerates up to 'n' character # mismatches from pyparsing import * import urllib.request, urllib.parse, urllib.error # read in a bunch of genomic data datafile = urllib.request.urlopen("http://toxodb.org/common/downloads/release-6.0/Tgondii/TgondiiApicoplastORFsNAs_ToxoDB-6.0.fasta") fastasrc = datafile.read() datafile.close() """ Sample header: >NC_001799-6-2978-2778 | organism=Toxoplasma_gondii_RH | location=NC_001799:2778-2978(-) | length=201 """ integer = Word(nums).setParseAction(lambda t:int(t[0])) genebit = Group(">" + Word(alphanums.upper()+"-_") + "|" + Word(printables)("id") + SkipTo("length=", include=True) + integer("genelen") + LineEnd() + Combine(OneOrMore(Word("ACGTN")),adjacent=False)("gene")) # read gene data from .fasta file - takes just a few seconds genedata = OneOrMore(genebit).parseString(fastasrc) class CloseMatch(Token): """A special subclass of Token that does *close* matches. For each close match of the given string, a tuple is returned giving the found close match, and a list of mismatch positions.""" def __init__(self, seq, maxMismatches=1): super(CloseMatch,self).__init__() self.name = seq self.sequence = seq self.maxMismatches = maxMismatches self.errmsg = "Expected " + self.sequence self.mayIndexError = False self.mayReturnEmpty = False def parseImpl( self, instring, loc, doActions=True ): start = loc instrlen = len(instring) maxloc = start + len(self.sequence) if maxloc <= instrlen: seq = self.sequence seqloc = 0 mismatches = [] throwException = False done = False while loc < maxloc and not done: if instring[loc] != seq[seqloc]: mismatches.append(seqloc) if len(mismatches) > self.maxMismatches: throwException = True done = True loc += 1 seqloc += 1 else: throwException = True if throwException: exc = self.myException exc.loc = loc exc.pstr = instring raise exc return loc, (instring[start:loc],mismatches) # using the genedata extracted above, look for close matches of a gene sequence searchseq = CloseMatch("TTAAATCTAGAAGAT", 3) for g in genedata: print("%s (%d)" % (g.id, g.genelen)) print("-"*24) for t,startLoc,endLoc in searchseq.scanString(g.gene, overlap=True): matched, mismatches = t[0] print("MATCH:", searchseq.sequence) print("FOUND:", matched) if mismatches: print(" ", ''.join(' ' if i not in mismatches else '*' for i,c in enumerate(searchseq.sequence))) else: print("") print("at location", startLoc) print() print() pyparsing-2.1.10/examples/pgn.py0000666000000000000000000000655412641072656014740 0ustar 00000000000000# pgn.py rel. 1.1 17-sep-2004 # # Demonstration of the parsing module, implementing a pgn parser. # # The aim of this parser is not to support database application, # but to create automagically a pgn annotated reading the log console file # of a lecture of ICC (Internet Chess Club), saved by Blitzin. # Of course you can modify the Abstract Syntax Tree to your purpose. # # Copyright 2004, by Alberto Santini http://www.albertosantini.it/chess/ # from pyparsing import alphanums, nums, quotedString from pyparsing import Combine, Forward, Group, Literal, oneOf, OneOrMore, Optional, Suppress, ZeroOrMore, White, Word from pyparsing import ParseException # # define pgn grammar # tag = Suppress("[") + Word(alphanums) + Combine(quotedString) + Suppress("]") comment = Suppress("{") + Word(alphanums + " ") + Suppress("}") dot = Literal(".") piece = oneOf("K Q B N R") file_coord = oneOf("a b c d e f g h") rank_coord = oneOf("1 2 3 4 5 6 7 8") capture = oneOf("x :") promote = Literal("=") castle_queenside = oneOf("O-O-O 0-0-0 o-o-o") castle_kingside = oneOf("O-O 0-0 o-o") move_number = Optional(comment) + Word(nums) + dot m1 = file_coord + rank_coord # pawn move e.g. d4 m2 = file_coord + capture + file_coord + rank_coord # pawn capture move e.g. dxe5 m3 = file_coord + "8" + promote + piece # pawn promotion e.g. e8=Q m4 = piece + file_coord + rank_coord # piece move e.g. Be6 m5 = piece + file_coord + file_coord + rank_coord # piece move e.g. Nbd2 m6 = piece + rank_coord + file_coord + rank_coord # piece move e.g. R4a7 m7 = piece + capture + file_coord + rank_coord # piece capture move e.g. Bxh7 m8 = castle_queenside | castle_kingside # castling e.g. o-o check = oneOf("+ ++") mate = Literal("#") annotation = Word("!?", max=2) nag = " $" + Word(nums) decoration = check | mate | annotation | nag variant = Forward() half_move = Combine((m3 | m1 | m2 | m4 | m5 | m6 | m7 | m8) + Optional(decoration)) \ + Optional(comment) +Optional(variant) move = Suppress(move_number) + half_move + Optional(half_move) variant << "(" + OneOrMore(move) + ")" # grouping the plies (half-moves) for each move: useful to group annotations, variants... # suggested by Paul McGuire :) move = Group(Suppress(move_number) + half_move + Optional(half_move)) variant << Group("(" + OneOrMore(move) + ")") game_terminator = oneOf("1-0 0-1 1/2-1/2 *") pgnGrammar = Suppress(ZeroOrMore(tag)) + ZeroOrMore(move) + Optional(Suppress(game_terminator)) def parsePGN( pgn, bnf=pgnGrammar, fn=None ): try: return bnf.parseString( pgn ) except ParseException as err: print(err.line) print(" "*(err.column-1) + "^") print(err) if __name__ == "__main__": # input string pgn = """ [Event "ICC 5 0 u"] [Site "Internet Chess Club"] [Date "2004.01.25"] [Round "-"] [White "guest920"] [Black "IceBox"] [Result "0-1"] [ICCResult "White checkmated"] [BlackElo "1498"] [Opening "French defense"] [ECO "C00"] [NIC "FR.01"] [Time "04:44:56"] [TimeControl "300+0"] 1. e4 e6 2. Nf3 d5 $2 3. exd5 (3. e5 g6 4. h4) exd5 4. Qe2+ Qe7 5. Qxe7+ Bxe7 6. d3 Nf6 7. Be3 Bg4 8. Nbd2 c5 9. h3 Be6 10. O-O-O Nc6 11. g4 Bd6 12. g5 Nd7 13. Rg1 d4 14. g6 fxg6 15. Bg5 Rf8 16. a3 Bd5 17. Re1+ Nde5 18. Nxe5 Nxe5 19. Bf4 Rf5 20. Bxe5 Rxe5 21. Rg5 Rxe1# {Black wins} 0-1 """ # parse input string tokens = parsePGN(pgn, pgnGrammar) print(tokens.dump()) pyparsing-2.1.10/examples/position.py0000666000000000000000000000425112466013312015775 0ustar 00000000000000from pyparsing import * text = """Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum""" # find all words beginning with a vowel vowels = "aeiouAEIOU" initialVowelWord = Word(vowels,alphas) # Unfortunately, searchString will advance character by character through # the input text, so it will detect that the initial "Lorem" is not an # initialVowelWord, but then it will test "orem" and think that it is. So # we need to add a do-nothing term that will match the words that start with # consonants, but we will just throw them away when we match them. The key is # that, in having been matched, the parser will skip over them entirely when # looking for initialVowelWords. consonants = ''.join(c for c in alphas if c not in vowels) initialConsWord = Word(consonants, alphas).suppress() # using scanString to locate where tokens are matched for t,start,end in (initialConsWord|initialVowelWord).scanString(text): if t: print(start,':', t[0]) # add parse action to annotate the parsed tokens with their location in the # input string def addLocnToTokens(s,l,t): t['locn'] = l t['word'] = t[0] initialVowelWord.setParseAction(addLocnToTokens) for ivowelInfo in (initialConsWord | initialVowelWord).searchString(text): if not ivowelInfo: continue print(ivowelInfo.locn, ':', ivowelInfo.word) # alternative - add an Empty that will save the current location def location(name): return Empty().setParseAction(lambda s,l,t: t.__setitem__(name,l)) locateInitialVowels = location("locn") + initialVowelWord("word") # search through the input text for ivowelInfo in (initialConsWord | locateInitialVowels).searchString(text): if not ivowelInfo: continue print(ivowelInfo.locn, ':', ivowelInfo.word) pyparsing-2.1.10/examples/protobuf_parser.py0000666000000000000000000000664612641070502017356 0ustar 00000000000000# protobuf_parser.py # # simple parser for parsing protobuf .proto files # # Copyright 2010, Paul McGuire # from pyparsing import (Word, alphas, alphanums, Regex, Suppress, Forward, Group, oneOf, ZeroOrMore, Optional, delimitedList, Keyword, restOfLine, quotedString, Dict) ident = Word(alphas+"_",alphanums+"_").setName("identifier") integer = Regex(r"[+-]?\d+") LBRACE,RBRACE,LBRACK,RBRACK,LPAR,RPAR,EQ,SEMI = map(Suppress,"{}[]()=;") kwds = """message required optional repeated enum extensions extends extend to package service rpc returns true false option import""" for kw in kwds.split(): exec("%s_ = Keyword('%s')" % (kw.upper(), kw)) messageBody = Forward() messageDefn = MESSAGE_ - ident("messageId") + LBRACE + messageBody("body") + RBRACE typespec = oneOf("""double float int32 int64 uint32 uint64 sint32 sint64 fixed32 fixed64 sfixed32 sfixed64 bool string bytes""") | ident rvalue = integer | TRUE_ | FALSE_ | ident fieldDirective = LBRACK + Group(ident + EQ + rvalue) + RBRACK fieldDefn = (( REQUIRED_ | OPTIONAL_ | REPEATED_ )("fieldQualifier") - typespec("typespec") + ident("ident") + EQ + integer("fieldint") + ZeroOrMore(fieldDirective) + SEMI) # enumDefn ::= 'enum' ident '{' { ident '=' integer ';' }* '}' enumDefn = ENUM_("typespec") - ident('name') + LBRACE + Dict( ZeroOrMore( Group(ident + EQ + integer + SEMI) ))('values') + RBRACE # extensionsDefn ::= 'extensions' integer 'to' integer ';' extensionsDefn = EXTENSIONS_ - integer + TO_ + integer + SEMI # messageExtension ::= 'extend' ident '{' messageBody '}' messageExtension = EXTEND_ - ident + LBRACE + messageBody + RBRACE # messageBody ::= { fieldDefn | enumDefn | messageDefn | extensionsDefn | messageExtension }* messageBody << Group(ZeroOrMore( Group(fieldDefn | enumDefn | messageDefn | extensionsDefn | messageExtension) )) # methodDefn ::= 'rpc' ident '(' [ ident ] ')' 'returns' '(' [ ident ] ')' ';' methodDefn = (RPC_ - ident("methodName") + LPAR + Optional(ident("methodParam")) + RPAR + RETURNS_ + LPAR + Optional(ident("methodReturn")) + RPAR) # serviceDefn ::= 'service' ident '{' methodDefn* '}' serviceDefn = SERVICE_ - ident("serviceName") + LBRACE + ZeroOrMore(Group(methodDefn)) + RBRACE # packageDirective ::= 'package' ident [ '.' ident]* ';' packageDirective = Group(PACKAGE_ - delimitedList(ident, '.', combine=True) + SEMI) comment = '//' + restOfLine importDirective = IMPORT_ - quotedString("importFileSpec") + SEMI optionDirective = OPTION_ - ident("optionName") + EQ + quotedString("optionValue") + SEMI topLevelStatement = Group(messageDefn | messageExtension | enumDefn | serviceDefn | importDirective | optionDirective) parser = Optional(packageDirective) + ZeroOrMore(topLevelStatement) parser.ignore(comment) test1 = """message Person { required int32 id = 1; required string name = 2; optional string email = 3; }""" test2 = """package tutorial; message Person { required string name = 1; required int32 id = 2; optional string email = 3; enum PhoneType { MOBILE = 0; HOME = 1; WORK = 2; } message PhoneNumber { required string number = 1; optional PhoneType type = 2 [default = HOME]; } repeated PhoneNumber phone = 4; } message AddressBook { repeated Person person = 1; }""" parser.runTests([test1, test2]) pyparsing-2.1.10/examples/pymicko.py0000666000000000000000000016627312466013312015621 0ustar 00000000000000#!/usr/bin/python # Python/pyparsing educational microC compiler v1.0 # Copyright (C) 2009 Zarko Zivanov # (largely based on flex/bison microC compiler by Zorica Suvajdzin, used with her permission; # current version can be found at http://www.acs.uns.ac.rs, under "Programski Prevodioci" [Serbian site]) # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # A copy of the GNU General Public License can be found at . from pyparsing import * from sys import stdin, stdout, stderr, argv, exit #defines debug level # 0 - no debug # 1 - print parsing results # 2 - print parsing results and symbol table # 3 - print parsing results only, without executing parse actions (grammar-only testing) DEBUG = 0 ########################################################################################## ########################################################################################## # About microC language and microC compiler # microC language and microC compiler are educational tools, and their goal is to show some basic principles # of writing a C language compiler. Compiler represents one (relatively simple) solution, not necessarily the best one. # This Python/pyparsing version is made using Python 2.6.4 and pyparsing 1.5.2 (and it may contain errors :) ) ########################################################################################## ########################################################################################## # Model of the used hypothetical processor # The reason behind using a hypothetical processor is to simplify code generation and to concentrate on the compiler itself. # This compiler can relatively easily be ported to x86, but one must know all the little details about which register # can be used for what, which registers are default for various operations, etc. # The hypothetical processor has 16 registers, called %0 to %15. Register %13 is used for the function return value (x86's eax), # %14 is the stack frame pointer (x86's ebp) and %15 is the stack pointer (x86's esp). All data-handling instructions can be # unsigned (suffix U), or signed (suffix S). These are ADD, SUB, MUL and DIV. These are three-address instructions, # the first two operands are input, the third one is output. Whether these operands are registers, memory or constant # is not relevant, all combinations are possible (except that output cannot be a constant). Constants are writen with a $ prefix (10-base only). # Conditional jumps are handled by JXXY instructions, where XX is LT, GT, LE, GE, EQ, NE (less than, greater than, less than or equal, etc.) # and Y is U or S (unsigned or signed, except for JEQ i JNE). Unconditional jump is JMP. The move instruction is MOV. # Function handling is done using CALL, RET, PUSH and POP (C style function calls). Static data is defined using the WORD directive # (example: variable: WORD 1), whose only argument defines the number of locations that are reserved. ########################################################################################## ########################################################################################## # Grammar of The microC Programming Language # (small subset of C made for compiler course at Faculty of Technical Sciences, Chair for Applied Computer Sciences, Novi Sad, Serbia) # Patterns: # letter # -> "_" | "a" | "A" | "b" | "B" | "c" | "C" | "d" | "D" | "e" | "E" | "f" # | "F" | "g" | "G" | "h" | "H" | "i" | "I" | "j" | "J" | "k" | "K" | "l" # | "L" | "m" | "M" | "n" | "N" | "o" | "O" | "p" | "P" | "q" | "Q" | "r" # | "R" | "s" | "S" | "t" | "T" | "u" | "U" | "v" | "V" | "w" | "W" | "x" # | "X" | "y" | "Y" | "z" | "Z" # digit # -> "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" # identifier # -> letter ( letter | digit )* # int_constant # -> digit + # unsigned_constant # -> digit + ( "u" | "U" ) # Productions: # program # -> variable_list function_list # -> function_list # variable_list # -> variable ";" # -> variable_list variable ";" # variable # -> type identifier # type # -> "int" # -> "unsigned" # function_list # -> function # -> function_list function # function # -> type identifier "(" parameters ")" body # parameters # -> # -> parameter_list # parameter_list # -> variable # -> parameter_list "," variable # body # -> "{" variable_list statement_list "}" # -> "{" statement_list "}" # statement_list # -> # -> statement_list statement # statement # -> assignement_statement # -> function_call_statement # -> if_statement # -> while_statement # -> return_statement # -> compound_statement # assignement_statement # -> identifier "=" num_exp ";" # num_exp # -> mul_exp # -> num_exp "+" mul_exp # -> num_exp "-" mul_exp # mul_exp # -> exp # -> mul_exp "*" exp # -> mul_exp "/" exp # exp # -> constant # -> identifier # -> function_call # -> "(" num_exp ")" # -> "+" exp # -> "-" exp # constant # -> int_constant # -> unsigned_constant # function_call # -> identifier "(" arguments ")" # arguments # -> # -> argument_list # argument_list # -> num_exp # -> argument_list "," num_exp # function_call_statement # -> function_call ";" # if_statement # -> "if" "(" log_exp ")" statement # -> "if" "(" log_exp ")" statement "else" statement # -> -> -> -> -> -> -> -> 2 # log_exp # -> and_exp # -> log_exp "||" and_exp # and_exp # -> rel_exp # -> and_exp "&&" rel_exp # rel_exp # -> num_exp "<" num_exp # -> num_exp ">" num_exp # -> num_exp "<=" num_exp # -> num_exp ">=" num_exp # -> num_exp "==" num_exp # -> num_exp "!=" num_exp # while_statement # -> "while" "(" log_exp ")" statement # return_statement # -> "return" num_exp ";" # compound_statement # -> "{" statement_list "}" # Comment: /* a comment */ ########################################################################################## ########################################################################################## class Enumerate(dict): """C enum emulation (original by Scott David Daniels)""" def __init__(self, names): for number, name in enumerate(names.split()): setattr(self, name, number) self[number] = name class SharedData(object): """Data used in all three main classes""" #Possible kinds of symbol table entries KINDS = Enumerate("NO_KIND WORKING_REGISTER GLOBAL_VAR FUNCTION PARAMETER LOCAL_VAR CONSTANT") #Supported types of functions and variables TYPES = Enumerate("NO_TYPE INT UNSIGNED") #bit size of variables TYPE_BIT_SIZE = 16 #min/max values of constants MIN_INT = -2 ** (TYPE_BIT_SIZE - 1) MAX_INT = 2 ** (TYPE_BIT_SIZE - 1) - 1 MAX_UNSIGNED = 2 ** TYPE_BIT_SIZE - 1 #available working registers (the last one is the register for function's return value!) REGISTERS = "%0 %1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11 %12 %13".split() #register for function's return value FUNCTION_REGISTER = len(REGISTERS) - 1 #the index of last working register LAST_WORKING_REGISTER = len(REGISTERS) - 2 #list of relational operators RELATIONAL_OPERATORS = "< > <= >= == !=".split() def __init__(self): #index of the currently parsed function self.functon_index = 0 #name of the currently parsed function self.functon_name = 0 #number of parameters of the currently parsed function self.function_params = 0 #number of local variables of the currently parsed function self.function_vars = 0 ########################################################################################## ########################################################################################## class ExceptionSharedData(object): """Class for exception handling data""" def __init__(self): #position in currently parsed text self.location = 0 #currently parsed text self.text = "" def setpos(self, location, text): """Helper function for setting curently parsed text and position""" self.location = location self.text = text exshared = ExceptionSharedData() class SemanticException(Exception): """Exception for semantic errors found during parsing, similar to ParseException. Introduced because ParseException is used internally in pyparsing and custom messages got lost and replaced by pyparsing's generic errors. """ def __init__(self, message, print_location=True): super(SemanticException,self).__init__() self._message = message self.location = exshared.location self.print_location = print_location if exshared.location != None: self.line = lineno(exshared.location, exshared.text) self.col = col(exshared.location, exshared.text) self.text = line(exshared.location, exshared.text) else: self.line = self.col = self.text = None def _get_message(self): return self._message def _set_message(self, message): self._message = message message = property(_get_message, _set_message) def __str__(self): """String representation of the semantic error""" msg = "Error" if self.print_location and (self.line != None): msg += " at line %d, col %d" % (self.line, self.col) msg += ": %s" % self.message if self.print_location and (self.line != None): msg += "\n%s" % self.text return msg ########################################################################################## ########################################################################################## class SymbolTableEntry(object): """Class which represents one symbol table entry.""" def __init__(self, sname = "", skind = 0, stype = 0, sattr = None, sattr_name = "None"): """Initialization of symbol table entry. sname - symbol name skind - symbol kind stype - symbol type sattr - symbol attribute sattr_name - symbol attribute name (used only for table display) """ self.name = sname self.kind = skind self.type = stype self.attribute = sattr self.attribute_name = sattr_name self.param_types = [] def set_attribute(self, name, value): """Sets attribute's name and value""" self.attribute_name = name self.attribute = value def attribute_str(self): """Returns attribute string (used only for table display)""" return "{0}={1}".format(self.attribute_name, self.attribute) if self.attribute != None else "None" class SymbolTable(object): """Class for symbol table of microC program""" def __init__(self, shared): """Initialization of the symbol table""" self.table = [] self.lable_len = 0 #put working registers in the symbol table for reg in range(SharedData.FUNCTION_REGISTER+1): self.insert_symbol(SharedData.REGISTERS[reg], SharedData.KINDS.WORKING_REGISTER, SharedData.TYPES.NO_TYPE) #shared data self.shared = shared def error(self, text=""): """Symbol table error exception. It should happen only if index is out of range while accessing symbol table. This exeption is not handled by the compiler, so as to allow traceback printing """ if text == "": raise Exception("Symbol table index out of range") else: raise Exception("Symbol table error: %s" % text) def display(self): """Displays the symbol table content""" #Finding the maximum length for each column sym_name = "Symbol name" sym_len = max(max(len(i.name) for i in self.table),len(sym_name)) kind_name = "Kind" kind_len = max(max(len(SharedData.KINDS[i.kind]) for i in self.table),len(kind_name)) type_name = "Type" type_len = max(max(len(SharedData.TYPES[i.type]) for i in self.table),len(type_name)) attr_name = "Attribute" attr_len = max(max(len(i.attribute_str()) for i in self.table),len(attr_name)) #print table header print("{0:3s} | {1:^{2}s} | {3:^{4}s} | {5:^{6}s} | {7:^{8}} | {9:s}".format(" No", sym_name, sym_len, kind_name, kind_len, type_name, type_len, attr_name, attr_len, "Parameters")) print("-----------------------------" + "-" * (sym_len + kind_len + type_len + attr_len)) #print symbol table for i,sym in enumerate(self.table): parameters = "" for p in sym.param_types: if parameters == "": parameters = "{0}".format(SharedData.TYPES[p]) else: parameters += ", {0}".format(SharedData.TYPES[p]) print("{0:3d} | {1:^{2}s} | {3:^{4}s} | {5:^{6}s} | {7:^{8}} | ({9})".format(i, sym.name, sym_len, SharedData.KINDS[sym.kind], kind_len, SharedData.TYPES[sym.type], type_len, sym.attribute_str(), attr_len, parameters)) def insert_symbol(self, sname, skind, stype): """Inserts new symbol at the end of the symbol table. Returns symbol index sname - symbol name skind - symbol kind stype - symbol type """ self.table.append(SymbolTableEntry(sname, skind, stype)) self.table_len = len(self.table) return self.table_len-1 def clear_symbols(self, index): """Clears all symbols begining with the index to the end of table""" try: del self.table[index:] except Exception: self.error() self.table_len = len(self.table) def lookup_symbol(self, sname, skind=list(SharedData.KINDS.keys()), stype=list(SharedData.TYPES.keys())): """Searches for symbol, from the end to the begining. Returns symbol index or None sname - symbol name skind - symbol kind (one kind, list of kinds, or None) deafult: any kind stype - symbol type (or None) default: any type """ skind = skind if isinstance(skind, list) else [skind] stype = stype if isinstance(stype, list) else [stype] for i, sym in [[x, self.table[x]] for x in range(len(self.table) - 1, SharedData.LAST_WORKING_REGISTER, -1)]: if (sym.name == sname) and (sym.kind in skind) and (sym.type in stype): return i return None def insert_id(self, sname, skind, skinds, stype): """Inserts a new identifier at the end of the symbol table, if possible. Returns symbol index, or raises an exception if the symbol alredy exists sname - symbol name skind - symbol kind skinds - symbol kinds to check for stype - symbol type """ index = self.lookup_symbol(sname, skinds) if index == None: index = self.insert_symbol(sname, skind, stype) return index else: raise SemanticException("Redefinition of '%s'" % sname) def insert_global_var(self, vname, vtype): "Inserts a new global variable" return self.insert_id(vname, SharedData.KINDS.GLOBAL_VAR, [SharedData.KINDS.GLOBAL_VAR, SharedData.KINDS.FUNCTION], vtype) def insert_local_var(self, vname, vtype, position): "Inserts a new local variable" index = self.insert_id(vname, SharedData.KINDS.LOCAL_VAR, [SharedData.KINDS.LOCAL_VAR, SharedData.KINDS.PARAMETER], vtype) self.table[index].attribute = position def insert_parameter(self, pname, ptype): "Inserts a new parameter" index = self.insert_id(pname, SharedData.KINDS.PARAMETER, SharedData.KINDS.PARAMETER, ptype) #set parameter's attribute to it's ordinal number self.table[index].set_attribute("Index", self.shared.function_params) #set parameter's type in param_types list of a function self.table[self.shared.function_index].param_types.append(ptype) return index def insert_function(self, fname, ftype): "Inserts a new function" index = self.insert_id(fname, SharedData.KINDS.FUNCTION, [SharedData.KINDS.GLOBAL_VAR, SharedData.KINDS.FUNCTION], ftype) self.table[index].set_attribute("Params",0) return index def insert_constant(self, cname, ctype): """Inserts a constant (or returns index if the constant already exists) Additionally, checks for range. """ index = self.lookup_symbol(cname, stype=ctype) if index == None: num = int(cname) if ctype == SharedData.TYPES.INT: if (num < SharedData.MIN_INT) or (num > SharedData.MAX_INT): raise SemanticException("Integer constant '%s' out of range" % cname) elif ctype == SharedData.TYPES.UNSIGNED: if (num < 0) or (num > SharedData.MAX_UNSIGNED): raise SemanticException("Unsigned constant '%s' out of range" % cname) index = self.insert_symbol(cname, SharedData.KINDS.CONSTANT, ctype) return index def same_types(self, index1, index2): """Returns True if both symbol table elements are of the same type""" try: same = self.table[index1].type == self.table[index2].type != SharedData.TYPES.NO_TYPE except Exception: self.error() return same def same_type_as_argument(self, index, function_index, argument_number): """Returns True if index and function's argument are of the same type index - index in symbol table function_index - function's index in symbol table argument_number - # of function's argument """ try: same = self.table[function_index].param_types[argument_number] == self.table[index].type except Exception: self.error() return same def get_attribute(self, index): try: return self.table[index].attribute except Exception: self.error() def set_attribute(self, index, value): try: self.table[index].attribute = value except Exception: self.error() def get_name(self, index): try: return self.table[index].name except Exception: self.error() def get_kind(self, index): try: return self.table[index].kind except Exception: self.error() def get_type(self, index): try: return self.table[index].type except Exception: self.error() def set_type(self, index, stype): try: self.table[index].type = stype except Exception: self.error() ########################################################################################## ########################################################################################## class CodeGenerator(object): """Class for code generation methods.""" #dictionary of relational operators RELATIONAL_DICT = dict([op,i] for i, op in enumerate(SharedData.RELATIONAL_OPERATORS)) #conditional jumps for relational operators CONDITIONAL_JUMPS = ["JLTS", "JGTS", "JLES", "JGES", "JEQ ", "JNE ", "JLTU", "JGTU", "JLEU", "JGEU", "JEQ ", "JNE "] #opposite conditional jumps for relational operators OPPOSITE_JUMPS = ["JGES", "JLES", "JGTS", "JLTS", "JNE ", "JEQ ", "JGEU", "JLEU", "JGTU", "JLTU", "JNE ", "JEQ "] #supported operations OPERATIONS = {"+" : "ADD", "-" : "SUB", "*" : "MUL", "/" : "DIV"} #suffixes for signed and unsigned operations (if no type is specified, unsigned will be assumed) OPSIGNS = {SharedData.TYPES.NO_TYPE : "U", SharedData.TYPES.INT : "S", SharedData.TYPES.UNSIGNED : "U"} #text at start of data segment DATA_START_TEXT = "#DATA" #text at start of code segment CODE_START_TEXT = "#CODE" def __init__(self, shared, symtab): #generated code self.code = "" #prefix for internal labels self.internal = "@" #suffix for label definition self.definition = ":" #list of free working registers self.free_registers = list(range(SharedData.FUNCTION_REGISTER, -1, -1)) #list of used working registers self.used_registers = [] #list of used registers needed when function call is inside of a function call self.used_registers_stack = [] #shared data self.shared = shared #symbol table self.symtab = symtab def error(self, text): """Compiler error exception. It should happen only if something is wrong with compiler. This exeption is not handled by the compiler, so as to allow traceback printing """ raise Exception("Compiler error: %s" % text) def take_register(self, rtype = SharedData.TYPES.NO_TYPE): """Reserves one working register and sets its type""" if len(self.free_registers) == 0: self.error("no more free registers") reg = self.free_registers.pop() self.used_registers.append(reg) self.symtab.set_type(reg, rtype) return reg def take_function_register(self, rtype = SharedData.TYPES.NO_TYPE): """Reserves register for function return value and sets its type""" reg = SharedData.FUNCTION_REGISTER if reg not in self.free_registers: self.error("function register already taken") self.free_registers.remove(reg) self.used_registers.append(reg) self.symtab.set_type(reg, rtype) return reg def free_register(self, reg): """Releases working register""" if reg not in self.used_registers: self.error("register %s is not taken" % self.REGISTERS[reg]) self.used_registers.remove(reg) self.free_registers.append(reg) self.free_registers.sort(reverse = True) def free_if_register(self, index): """If index is a working register, free it, otherwise just return (helper function)""" if (index < 0) or (index > SharedData.FUNCTION_REGISTER): return else: self.free_register(index) def label(self, name, internal=False, definition=False): """Generates label name (helper function) name - label name internal - boolean value, adds "@" prefix to label definition - boolean value, adds ":" suffix to label """ return "{0}{1}{2}".format(self.internal if internal else "", name, self.definition if definition else "") def symbol(self, index): """Generates symbol name from index""" #if index is actually a string, just return it if isinstance(index, str): return index elif (index < 0) or (index >= self.symtab.table_len): self.error("symbol table index out of range") sym = self.symtab.table[index] #local variables are located at negative offset from frame pointer register if sym.kind == SharedData.KINDS.LOCAL_VAR: return "-{0}(%14)".format(sym.attribute * 4 + 4) #parameters are located at positive offset from frame pointer register elif sym.kind == SharedData.KINDS.PARAMETER: return "{0}(%14)".format(8 + sym.attribute * 4) elif sym.kind == SharedData.KINDS.CONSTANT: return "${0}".format(sym.name) else: return "{0}".format(sym.name) def save_used_registers(self): """Pushes all used working registers before function call""" used = self.used_registers[:] del self.used_registers[:] self.used_registers_stack.append(used[:]) used.sort() for reg in used: self.newline_text("PUSH\t%s" % SharedData.REGISTERS[reg], True) self.free_registers.extend(used) self.free_registers.sort(reverse = True) def restore_used_registers(self): """Pops all used working registers after function call""" used = self.used_registers_stack.pop() self.used_registers = used[:] used.sort(reverse = True) for reg in used: self.newline_text("POP \t%s" % SharedData.REGISTERS[reg], True) self.free_registers.remove(reg) def text(self, text): """Inserts text into generated code""" self.code += text def prepare_data_segment(self): """Inserts text at the start of data segment""" self.text(self.DATA_START_TEXT) def prepare_code_segment(self): """Inserts text at the start of code segment""" self.newline_text(self.CODE_START_TEXT) def newline(self, indent=False): """Inserts a newline, optionally with indentation.""" self.text("\n") if indent: self.text("\t\t\t") def newline_text(self, text, indent = False): """Inserts a newline and text, optionally with indentation (helper function)""" self.newline(indent) self.text(text) def newline_label(self, name, internal=False, definition=False): """Inserts a newline and a label (helper function) name - label name internal - boolean value, adds "@" prefix to label definition - boolean value, adds ":" suffix to label """ self.newline_text(self.label("{0}{1}{2}".format("@" if internal else "", name, ":" if definition else ""))) def global_var(self, name): """Inserts a new static (global) variable definition""" self.newline_label(name, False, True) self.newline_text("WORD\t1", True) def arithmetic_mnemonic(self, op_name, op_type): """Generates an arithmetic instruction mnemonic""" return self.OPERATIONS[op_name] + self.OPSIGNS[op_type] def arithmetic(self, operation, operand1, operand2, operand3 = None): """Generates an arithmetic instruction operation - one of supporetd operations operandX - index in symbol table or text representation of operand First two operands are input, third one is output """ if isinstance(operand1, int): output_type = self.symtab.get_type(operand1) self.free_if_register(operand1) else: output_type = None if isinstance(operand2, int): output_type = self.symtab.get_type(operand2) if output_type == None else output_type self.free_if_register(operand2) else: output_type = SharedData.TYPES.NO_TYPE if output_type == None else output_type #if operand3 is not defined, reserve one free register for it output = self.take_register(output_type) if operand3 == None else operand3 mnemonic = self.arithmetic_mnemonic(operation, output_type) self.newline_text("{0}\t{1},{2},{3}".format(mnemonic, self.symbol(operand1), self.symbol(operand2), self.symbol(output)), True) return output def relop_code(self, relop, operands_type): """Returns code for relational operator relop - relational operator operands_type - int or unsigned """ code = self.RELATIONAL_DICT[relop] offset = 0 if operands_type == SharedData.TYPES.INT else len(SharedData.RELATIONAL_OPERATORS) return code + offset def jump(self, relcode, opposite, label): """Generates a jump instruction relcode - relational operator code opposite - generate normal or opposite jump label - jump label """ jump = self.OPPOSITE_JUMPS[relcode] if opposite else self.CONDITIONAL_JUMPS[relcode] self.newline_text("{0}\t{1}".format(jump, label), True) def unconditional_jump(self, label): """Generates an unconditional jump instruction label - jump label """ self.newline_text("JMP \t{0}".format(label), True) def move(self,operand1, operand2): """Generates a move instruction If the output operand (opernad2) is a working register, sets it's type operandX - index in symbol table or text representation of operand """ if isinstance(operand1, int): output_type = self.symtab.get_type(operand1) self.free_if_register(operand1) else: output_type = SharedData.TYPES.NO_TYPE self.newline_text("MOV \t{0},{1}".format(self.symbol(operand1), self.symbol(operand2)), True) if isinstance(operand2, int): if self.symtab.get_kind(operand2) == SharedData.KINDS.WORKING_REGISTER: self.symtab.set_type(operand2, output_type) def push(self, operand): """Generates a push operation""" self.newline_text("PUSH\t%s" % self.symbol(operand), True) def pop(self, operand): """Generates a pop instruction""" self.newline_text("POP \t%s" % self.symbol(operand), True) def compare(self, operand1, operand2): """Generates a compare instruction operandX - index in symbol table """ typ = self.symtab.get_type(operand1) self.free_if_register(operand1) self.free_if_register(operand2) self.newline_text("CMP{0}\t{1},{2}".format(self.OPSIGNS[typ], self.symbol(operand1), self.symbol(operand2)), True) def function_begin(self): """Inserts function name label and function frame initialization""" self.newline_label(self.shared.function_name, False, True) self.push("%14") self.move("%15", "%14") def function_body(self): """Inserts a local variable initialization and body label""" if self.shared.function_vars > 0: const = self.symtab.insert_constant("{0}".format(self.shared.function_vars * 4), SharedData.TYPES.UNSIGNED) self.arithmetic("-", "%15", const, "%15") self.newline_label(self.shared.function_name + "_body", True, True) def function_end(self): """Inserts an exit label and function return instructions""" self.newline_label(self.shared.function_name + "_exit", True, True) self.move("%14", "%15") self.pop("%14") self.newline_text("RET", True) def function_call(self, function, arguments): """Generates code for a function call function - function index in symbol table arguments - list of arguments (indexes in symbol table) """ #push each argument to stack for arg in arguments: self.push(self.symbol(arg)) self.free_if_register(arg) self.newline_text("CALL\t"+self.symtab.get_name(function), True) args = self.symtab.get_attribute(function) #generates stack cleanup if function has arguments if args > 0: args_space = self.symtab.insert_constant("{0}".format(args * 4), SharedData.TYPES.UNSIGNED) self.arithmetic("+", "%15", args_space, "%15") ########################################################################################## ########################################################################################## class MicroC(object): """Class for microC parser/compiler""" def __init__(self): #Definitions of terminal symbols for microC programming language self.tId = Word(alphas+"_",alphanums+"_") self.tInteger = Word(nums).setParseAction(lambda x : [x[0], SharedData.TYPES.INT]) self.tUnsigned = Regex(r"[0-9]+[uU]").setParseAction(lambda x : [x[0][:-1], SharedData.TYPES.UNSIGNED]) self.tConstant = (self.tUnsigned | self.tInteger).setParseAction(self.constant_action) self.tType = Keyword("int").setParseAction(lambda x : SharedData.TYPES.INT) | \ Keyword("unsigned").setParseAction(lambda x : SharedData.TYPES.UNSIGNED) self.tRelOp = oneOf(SharedData.RELATIONAL_OPERATORS) self.tMulOp = oneOf("* /") self.tAddOp = oneOf("+ -") #Definitions of rules for global variables self.rGlobalVariable = (self.tType("type") + self.tId("name") + FollowedBy(";")).setParseAction(self.global_variable_action) self.rGlobalVariableList = ZeroOrMore(self.rGlobalVariable + Suppress(";")) #Definitions of rules for numeric expressions self.rExp = Forward() self.rMulExp = Forward() self.rNumExp = Forward() self.rArguments = delimitedList(self.rNumExp("exp").setParseAction(self.argument_action)) self.rFunctionCall = ((self.tId("name") + FollowedBy("(")).setParseAction(self.function_call_prepare_action) + Suppress("(") + Optional(self.rArguments)("args") + Suppress(")")).setParseAction(self.function_call_action) self.rExp << (self.rFunctionCall | self.tConstant | self.tId("name").setParseAction(self.lookup_id_action) | Group(Suppress("(") + self.rNumExp + Suppress(")")) | Group("+" + self.rExp) | Group("-" + self.rExp)).setParseAction(lambda x : x[0]) self.rMulExp << ((self.rExp + ZeroOrMore(self.tMulOp + self.rExp))).setParseAction(self.mulexp_action) self.rNumExp << (self.rMulExp + ZeroOrMore(self.tAddOp + self.rMulExp)).setParseAction(self.numexp_action) #Definitions of rules for logical expressions (these are without parenthesis support) self.rAndExp = Forward() self.rLogExp = Forward() self.rRelExp = (self.rNumExp + self.tRelOp + self.rNumExp).setParseAction(self.relexp_action) self.rAndExp << (self.rRelExp("exp") + ZeroOrMore(Literal("&&").setParseAction(self.andexp_action) + self.rRelExp("exp")).setParseAction(lambda x : self.relexp_code)) self.rLogExp << (self.rAndExp("exp") + ZeroOrMore(Literal("||").setParseAction(self.logexp_action) + self.rAndExp("exp")).setParseAction(lambda x : self.andexp_code)) #Definitions of rules for statements self.rStatement = Forward() self.rStatementList = Forward() self.rReturnStatement = (Keyword("return") + self.rNumExp("exp") + Suppress(";")).setParseAction(self.return_action) self.rAssignmentStatement = (self.tId("var") + Suppress("=") + self.rNumExp("exp") + Suppress(";")).setParseAction(self.assignment_action) self.rFunctionCallStatement = self.rFunctionCall + Suppress(";") self.rIfStatement = ( (Keyword("if") + FollowedBy("(")).setParseAction(self.if_begin_action) + (Suppress("(") + self.rLogExp + Suppress(")")).setParseAction(self.if_body_action) + (self.rStatement + Empty()).setParseAction(self.if_else_action) + Optional(Keyword("else") + self.rStatement)).setParseAction(self.if_end_action) self.rWhileStatement = ( (Keyword("while") + FollowedBy("(")).setParseAction(self.while_begin_action) + (Suppress("(") + self.rLogExp + Suppress(")")).setParseAction(self.while_body_action) + self.rStatement).setParseAction(self.while_end_action) self.rCompoundStatement = Group(Suppress("{") + self.rStatementList + Suppress("}")) self.rStatement << (self.rReturnStatement | self.rIfStatement | self.rWhileStatement | self.rFunctionCallStatement | self.rAssignmentStatement | self.rCompoundStatement) self.rStatementList << ZeroOrMore(self.rStatement) self.rLocalVariable = (self.tType("type") + self.tId("name") + FollowedBy(";")).setParseAction(self.local_variable_action) self.rLocalVariableList = ZeroOrMore(self.rLocalVariable + Suppress(";")) self.rFunctionBody = Suppress("{") + Optional(self.rLocalVariableList).setParseAction(self.function_body_action) + \ self.rStatementList + Suppress("}") self.rParameter = (self.tType("type") + self.tId("name")).setParseAction(self.parameter_action) self.rParameterList = delimitedList(self.rParameter) self.rFunction = ( (self.tType("type") + self.tId("name")).setParseAction(self.function_begin_action) + Group(Suppress("(") + Optional(self.rParameterList)("params") + Suppress(")") + self.rFunctionBody)).setParseAction(self.function_end_action) self.rFunctionList = OneOrMore(self.rFunction) self.rProgram = (Empty().setParseAction(self.data_begin_action) + self.rGlobalVariableList + Empty().setParseAction(self.code_begin_action) + self.rFunctionList).setParseAction(self.program_end_action) #shared data self.shared = SharedData() #symbol table self.symtab = SymbolTable(self.shared) #code generator self.codegen = CodeGenerator(self.shared, self.symtab) #index of the current function call self.function_call_index = -1 #stack for the nested function calls self.function_call_stack = [] #arguments of the current function call self.function_arguments = [] #stack for arguments of the nested function calls self.function_arguments_stack = [] #number of arguments for the curent function call self.function_arguments_number = -1 #stack for the number of arguments for the nested function calls self.function_arguments_number_stack = [] #last relational expression self.relexp_code = None #last and expression self.andexp_code = None #label number for "false" internal labels self.false_label_number = -1 #label number for all other internal labels self.label_number = None #label stack for nested statements self.label_stack = [] def warning(self, message, print_location=True): """Displays warning message. Uses exshared for current location of parsing""" msg = "Warning" if print_location and (exshared.location != None): wline = lineno(exshared.location, exshared.text) wcol = col(exshared.location, exshared.text) wtext = line(exshared.location, exshared.text) msg += " at line %d, col %d" % (wline, wcol) msg += ": %s" % message if print_location and (exshared.location != None): msg += "\n%s" % wtext print(msg) def data_begin_action(self): """Inserts text at start of data segment""" self.codegen.prepare_data_segment() def code_begin_action(self): """Inserts text at start of code segment""" self.codegen.prepare_code_segment() def global_variable_action(self, text, loc, var): """Code executed after recognising a global variable""" exshared.setpos(loc, text) if DEBUG > 0: print("GLOBAL_VAR:",var) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return index = self.symtab.insert_global_var(var.name, var.type) self.codegen.global_var(var.name) return index def local_variable_action(self, text, loc, var): """Code executed after recognising a local variable""" exshared.setpos(loc, text) if DEBUG > 0: print("LOCAL_VAR:",var, var.name, var.type) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return index = self.symtab.insert_local_var(var.name, var.type, self.shared.function_vars) self.shared.function_vars += 1 return index def parameter_action(self, text, loc, par): """Code executed after recognising a parameter""" exshared.setpos(loc, text) if DEBUG > 0: print("PARAM:",par) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return index = self.symtab.insert_parameter(par.name, par.type) self.shared.function_params += 1 return index def constant_action(self, text, loc, const): """Code executed after recognising a constant""" exshared.setpos(loc, text) if DEBUG > 0: print("CONST:",const) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return return self.symtab.insert_constant(const[0], const[1]) def function_begin_action(self, text, loc, fun): """Code executed after recognising a function definition (type and function name)""" exshared.setpos(loc, text) if DEBUG > 0: print("FUN_BEGIN:",fun) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return self.shared.function_index = self.symtab.insert_function(fun.name, fun.type) self.shared.function_name = fun.name self.shared.function_params = 0 self.shared.function_vars = 0 self.codegen.function_begin(); def function_body_action(self, text, loc, fun): """Code executed after recognising the beginning of function's body""" exshared.setpos(loc, text) if DEBUG > 0: print("FUN_BODY:",fun) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return self.codegen.function_body() def function_end_action(self, text, loc, fun): """Code executed at the end of function definition""" if DEBUG > 0: print("FUN_END:",fun) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #set function's attribute to number of function parameters self.symtab.set_attribute(self.shared.function_index, self.shared.function_params) #clear local function symbols (but leave function name) self.symtab.clear_symbols(self.shared.function_index + 1) self.codegen.function_end() def return_action(self, text, loc, ret): """Code executed after recognising a return statement""" exshared.setpos(loc, text) if DEBUG > 0: print("RETURN:",ret) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return if not self.symtab.same_types(self.shared.function_index, ret.exp[0]): raise SemanticException("Incompatible type in return") #set register for function's return value to expression value reg = self.codegen.take_function_register() self.codegen.move(ret.exp[0], reg) #after return statement, register for function's return value is available again self.codegen.free_register(reg) #jump to function's exit self.codegen.unconditional_jump(self.codegen.label(self.shared.function_name+"_exit", True)) def lookup_id_action(self, text, loc, var): """Code executed after recognising an identificator in expression""" exshared.setpos(loc, text) if DEBUG > 0: print("EXP_VAR:",var) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return var_index = self.symtab.lookup_symbol(var.name, [SharedData.KINDS.GLOBAL_VAR, SharedData.KINDS.PARAMETER, SharedData.KINDS.LOCAL_VAR]) if var_index == None: raise SemanticException("'%s' undefined" % var.name) return var_index def assignment_action(self, text, loc, assign): """Code executed after recognising an assignment statement""" exshared.setpos(loc, text) if DEBUG > 0: print("ASSIGN:",assign) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return var_index = self.symtab.lookup_symbol(assign.var, [SharedData.KINDS.GLOBAL_VAR, SharedData.KINDS.PARAMETER, SharedData.KINDS.LOCAL_VAR]) if var_index == None: raise SemanticException("Undefined lvalue '%s' in assignment" % assign.var) if not self.symtab.same_types(var_index, assign.exp[0]): raise SemanticException("Incompatible types in assignment") self.codegen.move(assign.exp[0], var_index) def mulexp_action(self, text, loc, mul): """Code executed after recognising a mulexp expression (something *|/ something)""" exshared.setpos(loc, text) if DEBUG > 0: print("MUL_EXP:",mul) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #iterate through all multiplications/divisions m = list(mul) while len(m) > 1: if not self.symtab.same_types(m[0], m[2]): raise SemanticException("Invalid opernads to binary '%s'" % m[1]) reg = self.codegen.arithmetic(m[1], m[0], m[2]) #replace first calculation with it's result m[0:3] = [reg] return m[0] def numexp_action(self, text, loc, num): """Code executed after recognising a numexp expression (something +|- something)""" exshared.setpos(loc, text) if DEBUG > 0: print("NUM_EXP:",num) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #iterate through all additions/substractions n = list(num) while len(n) > 1: if not self.symtab.same_types(n[0], n[2]): raise SemanticException("Invalid opernads to binary '%s'" % n[1]) reg = self.codegen.arithmetic(n[1], n[0], n[2]) #replace first calculation with it's result n[0:3] = [reg] return n[0] def function_call_prepare_action(self, text, loc, fun): """Code executed after recognising a function call (type and function name)""" exshared.setpos(loc, text) if DEBUG > 0: print("FUN_PREP:",fun) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return index = self.symtab.lookup_symbol(fun.name, SharedData.KINDS.FUNCTION) if index == None: raise SemanticException("'%s' is not a function" % fun.name) #save any previous function call data (for nested function calls) self.function_call_stack.append(self.function_call_index) self.function_call_index = index self.function_arguments_stack.append(self.function_arguments[:]) del self.function_arguments[:] self.codegen.save_used_registers() def argument_action(self, text, loc, arg): """Code executed after recognising each of function's arguments""" exshared.setpos(loc, text) if DEBUG > 0: print("ARGUMENT:",arg.exp) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return arg_ordinal = len(self.function_arguments) #check argument's type if not self.symtab.same_type_as_argument(arg.exp, self.function_call_index, arg_ordinal): raise SemanticException("Incompatible type for argument %d in '%s'" % (arg_ordinal + 1, self.symtab.get_name(self.function_call_index))) self.function_arguments.append(arg.exp) def function_call_action(self, text, loc, fun): """Code executed after recognising the whole function call""" exshared.setpos(loc, text) if DEBUG > 0: print("FUN_CALL:",fun) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #check number of arguments if len(self.function_arguments) != self.symtab.get_attribute(self.function_call_index): raise SemanticException("Wrong number of arguments for function '%s'" % fun.name) #arguments should be pushed to stack in reverse order self.function_arguments.reverse() self.codegen.function_call(self.function_call_index, self.function_arguments) self.codegen.restore_used_registers() return_type = self.symtab.get_type(self.function_call_index) #restore previous function call data self.function_call_index = self.function_call_stack.pop() self.function_arguments = self.function_arguments_stack.pop() register = self.codegen.take_register(return_type) #move result to a new free register, to allow the next function call self.codegen.move(self.codegen.take_function_register(return_type), register) return register def relexp_action(self, text, loc, arg): """Code executed after recognising a relexp expression (something relop something)""" if DEBUG > 0: print("REL_EXP:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return exshared.setpos(loc, text) if not self.symtab.same_types(arg[0], arg[2]): raise SemanticException("Invalid operands for operator '{0}'".format(arg[1])) self.codegen.compare(arg[0], arg[2]) #return relational operator's code self.relexp_code = self.codegen.relop_code(arg[1], self.symtab.get_type(arg[0])) return self.relexp_code def andexp_action(self, text, loc, arg): """Code executed after recognising a andexp expression (something and something)""" exshared.setpos(loc, text) if DEBUG > 0: print("AND+EXP:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return label = self.codegen.label("false{0}".format(self.false_label_number), True, False) self.codegen.jump(self.relexp_code, True, label) self.andexp_code = self.relexp_code return self.andexp_code def logexp_action(self, text, loc, arg): """Code executed after recognising logexp expression (something or something)""" exshared.setpos(loc, text) if DEBUG > 0: print("LOG_EXP:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return label = self.codegen.label("true{0}".format(self.label_number), True, False) self.codegen.jump(self.relexp_code, False, label) self.codegen.newline_label("false{0}".format(self.false_label_number), True, True) self.false_label_number += 1 def if_begin_action(self, text, loc, arg): """Code executed after recognising an if statement (if keyword)""" exshared.setpos(loc, text) if DEBUG > 0: print("IF_BEGIN:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return self.false_label_number += 1 self.label_number = self.false_label_number self.codegen.newline_label("if{0}".format(self.label_number), True, True) def if_body_action(self, text, loc, arg): """Code executed after recognising if statement's body""" exshared.setpos(loc, text) if DEBUG > 0: print("IF_BODY:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #generate conditional jump (based on last compare) label = self.codegen.label("false{0}".format(self.false_label_number), True, False) self.codegen.jump(self.relexp_code, True, label) #generate 'true' label (executes if condition is satisfied) self.codegen.newline_label("true{0}".format(self.label_number), True, True) #save label numbers (needed for nested if/while statements) self.label_stack.append(self.false_label_number) self.label_stack.append(self.label_number) def if_else_action(self, text, loc, arg): """Code executed after recognising if statement's else body""" exshared.setpos(loc, text) if DEBUG > 0: print("IF_ELSE:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #jump to exit after all statements for true condition are executed self.label_number = self.label_stack.pop() label = self.codegen.label("exit{0}".format(self.label_number), True, False) self.codegen.unconditional_jump(label) #generate final 'false' label (executes if condition isn't satisfied) self.codegen.newline_label("false{0}".format(self.label_stack.pop()), True, True) self.label_stack.append(self.label_number) def if_end_action(self, text, loc, arg): """Code executed after recognising a whole if statement""" exshared.setpos(loc, text) if DEBUG > 0: print("IF_END:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return self.codegen.newline_label("exit{0}".format(self.label_stack.pop()), True, True) def while_begin_action(self, text, loc, arg): """Code executed after recognising a while statement (while keyword)""" exshared.setpos(loc, text) if DEBUG > 0: print("WHILE_BEGIN:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return self.false_label_number += 1 self.label_number = self.false_label_number self.codegen.newline_label("while{0}".format(self.label_number), True, True) def while_body_action(self, text, loc, arg): """Code executed after recognising while statement's body""" exshared.setpos(loc, text) if DEBUG > 0: print("WHILE_BODY:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #generate conditional jump (based on last compare) label = self.codegen.label("false{0}".format(self.false_label_number), True, False) self.codegen.jump(self.relexp_code, True, label) #generate 'true' label (executes if condition is satisfied) self.codegen.newline_label("true{0}".format(self.label_number), True, True) self.label_stack.append(self.false_label_number) self.label_stack.append(self.label_number) def while_end_action(self, text, loc, arg): """Code executed after recognising a whole while statement""" exshared.setpos(loc, text) if DEBUG > 0: print("WHILE_END:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return #jump to condition checking after while statement body self.label_number = self.label_stack.pop() label = self.codegen.label("while{0}".format(self.label_number), True, False) self.codegen.unconditional_jump(label) #generate final 'false' label and exit label self.codegen.newline_label("false{0}".format(self.label_stack.pop()), True, True) self.codegen.newline_label("exit{0}".format(self.label_number), True, True) def program_end_action(self, text, loc, arg): """Checks if there is a 'main' function and the type of 'main' function""" exshared.setpos(loc, text) if DEBUG > 0: print("PROGRAM_END:",arg) if DEBUG == 2: self.symtab.display() if DEBUG > 2: return index = self.symtab.lookup_symbol("main",SharedData.KINDS.FUNCTION) if index == None: raise SemanticException("Undefined reference to 'main'", False) elif self.symtab.get_type(index) != SharedData.TYPES.INT: self.warning("Return type of 'main' is not int", False) def parse_text(self,text): """Parse string (helper function)""" try: return self.rProgram.ignore(cStyleComment).parseString(text, parseAll=True) except SemanticException as err: print(err) exit(3) except ParseException as err: print(err) exit(3) def parse_file(self,filename): """Parse file (helper function)""" try: return self.rProgram.ignore(cStyleComment).parseFile(filename, parseAll=True) except SemanticException as err: print(err) exit(3) except ParseException as err: print(err) exit(3) ########################################################################################## ########################################################################################## if 0: #main program mc = MicroC() output_file = "output.asm" if len(argv) == 1: input_file = stdin elif len(argv) == 2: input_file = argv[1] elif len(argv) == 3: input_file = argv[1] output_file = argv[2] else: usage = """Usage: {0} [input_file [output_file]] If output file is omitted, output.asm is used If input file is omitted, stdin is used""".format(argv[0]) print(usage) exit(1) try: parse = stdin if input_file == stdin else open(input_file,'r') except Exception: print("Input file '%s' open error" % input_file) exit(2) mc.parse_file(parse) #if you want to see the final symbol table, uncomment next line #mc.symtab.display() try: out = open(output_file, 'w') out.write(mc.codegen.code) out.close except Exception: print("Output file '%s' open error" % output_file) exit(2) ########################################################################################## ########################################################################################## if __name__ == "__main__": test_program_example = """ int a; int b; int c; unsigned d; int fun1(int x, unsigned y) { return 123; } int fun2(int a) { return 1 + a * fun1(a, 456u); } int main(int x, int y) { int w; unsigned z; if (9 > 8 && 2 < 3 || 6 != 5 && a <= b && c < x || w >= y) { a = b + 1; if (x == y) while (d < 4u) x = x * w; else while (a + b < c - y && x > 3 || y < 2) if (z > d) a = a - 4; else b = a * b * c * x / y; } else c = 4; a = fun1(x,d) + fun2(fun1(fun2(w + 3 * 2) + 2 * c, 2u)); return 2; } """ mc = MicroC() mc.parse_text(test_program_example) print(mc.codegen.code)pyparsing-2.1.10/examples/pythonGrammarParser.py0000666000000000000000000002004612466013312020136 0ustar 00000000000000# pythonGrammarParser.py # # Copyright, 2006, by Paul McGuire # from pyparsing import * # should probably read this from the Grammar file provided with the Python source, but # this just skips that step and inlines the bnf text directly - this grammar was taken from # Python 2.4.1 # grammar = """ # Grammar for Python # Note: Changing the grammar specified in this file will most likely # require corresponding changes in the parser module # (../Modules/parsermodule.c). If you can't make the changes to # that module yourself, please co-ordinate the required changes # with someone who can; ask around on python-dev for help. Fred # Drake will probably be listening there. # Commands for Kees Blom's railroad program #diagram:token NAME #diagram:token NUMBER #diagram:token STRING #diagram:token NEWLINE #diagram:token ENDMARKER #diagram:token INDENT #diagram:output\input python.bla #diagram:token DEDENT #diagram:output\textwidth 20.04cm\oddsidemargin 0.0cm\evensidemargin 0.0cm #diagram:rules # Start symbols for the grammar: # single_input is a single interactive statement; # file_input is a module or sequence of commands read from an input file; # eval_input is the input for the eval() and input() functions. # NB: compound_stmt in single_input is followed by extra NEWLINE! single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE file_input: (NEWLINE | stmt)* ENDMARKER eval_input: testlist NEWLINE* ENDMARKER decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE decorators: decorator+ funcdef: [decorators] 'def' NAME parameters ':' suite parameters: '(' [varargslist] ')' varargslist: (fpdef ['=' test] ',')* ('*' NAME [',' '**' NAME] | '**' NAME) | fpdef ['=' test] (',' fpdef ['=' test])* [','] fpdef: NAME | '(' fplist ')' fplist: fpdef (',' fpdef)* [','] stmt: simple_stmt | compound_stmt simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | exec_stmt | assert_stmt expr_stmt: testlist (augassign testlist | ('=' testlist)*) augassign: '+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=' | '**=' | '//=' # For normal assignments, additional restrictions enforced by the interpreter print_stmt: 'print' ( [ test (',' test)* [','] ] | '>>' test [ (',' test)+ [','] ] ) del_stmt: 'del' exprlist pass_stmt: 'pass' flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt | yield_stmt break_stmt: 'break' continue_stmt: 'continue' return_stmt: 'return' [testlist] yield_stmt: 'yield' testlist raise_stmt: 'raise' [test [',' test [',' test]]] import_stmt: import_name | import_from import_name: 'import' dotted_as_names import_from: 'from' dotted_name 'import' ('*' | '(' import_as_names ')' | import_as_names) import_as_name: NAME [NAME NAME] dotted_as_name: dotted_name [NAME NAME] import_as_names: import_as_name (',' import_as_name)* [','] dotted_as_names: dotted_as_name (',' dotted_as_name)* dotted_name: NAME ('.' NAME)* global_stmt: 'global' NAME (',' NAME)* exec_stmt: 'exec' expr ['in' test [',' test]] assert_stmt: 'assert' test [',' test] #35 compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite] while_stmt: 'while' test ':' suite ['else' ':' suite] for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite] try_stmt: ('try' ':' suite (except_clause ':' suite)+ #diagram:break ['else' ':' suite] | 'try' ':' suite 'finally' ':' suite) # NB compile.c makes sure that the default except clause is last except_clause: 'except' [test [',' test]] suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT test: and_test ('or' and_test)* | lambdef and_test: not_test ('and' not_test)* not_test: 'not' not_test | comparison comparison: expr (comp_op expr)* comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not' expr: xor_expr ('|' xor_expr)* xor_expr: and_expr ('^' and_expr)* and_expr: shift_expr ('&' shift_expr)* shift_expr: arith_expr (('<<'|'>>') arith_expr)* arith_expr: term (('+'|'-') term)* term: factor (('*'|'/'|'%'|'//') factor)* factor: ('+'|'-'|'~') factor | power power: atom trailer* ['**' factor] atom: '(' [testlist_gexp] ')' | '[' [listmaker] ']' | '{' [dictmaker] '}' | '`' testlist1 '`' | NAME | NUMBER | STRING+ listmaker: test ( list_for | (',' test)* [','] ) testlist_gexp: test ( gen_for | (',' test)* [','] ) lambdef: 'lambda' [varargslist] ':' test trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME subscriptlist: subscript (',' subscript)* [','] subscript: '.' '.' '.' | test | [test] ':' [test] [sliceop] sliceop: ':' [test] exprlist: expr (',' expr)* [','] testlist: test (',' test)* [','] testlist_safe: test [(',' test)+ [',']] dictmaker: test ':' test (',' test ':' test)* [','] classdef: 'class' NAME ['(' testlist ')'] ':' suite arglist: (argument ',')* (argument [',']| '*' test [',' '**' test] | '**' test) argument: [test '='] test [gen_for] # Really [keyword '='] test list_iter: list_for | list_if list_for: 'for' exprlist 'in' testlist_safe [list_iter] list_if: 'if' test [list_iter] gen_iter: gen_for | gen_if gen_for: 'for' exprlist 'in' test [gen_iter] gen_if: 'if' test [gen_iter] testlist1: test (',' test)* # not used in grammar, but may appear in "node" passed from Parser to Compiler encoding_decl: NAME """ class SemanticGroup(object): def __init__(self,contents): self.contents = contents while self.contents[-1].__class__ == self.__class__: self.contents = self.contents[:-1] + self.contents[-1].contents def __str__(self): return "%s(%s)" % (self.label, " ".join([isinstance(c,str) and c or str(c) for c in self.contents]) ) class OrList(SemanticGroup): label = "OR" pass class AndList(SemanticGroup): label = "AND" pass class OptionalGroup(SemanticGroup): label = "OPT" pass class Atom(SemanticGroup): def __init__(self,contents): if len(contents) > 1: self.rep = contents[1] else: self.rep = "" if isinstance(contents,str): self.contents = contents else: self.contents = contents[0] def __str__(self): return "%s%s" % (self.rep, self.contents) def makeGroupObject(cls): def groupAction(s,l,t): try: return cls(t[0].asList()) except: return cls(t) return groupAction # bnf punctuation LPAREN = Suppress("(") RPAREN = Suppress(")") LBRACK = Suppress("[") RBRACK = Suppress("]") COLON = Suppress(":") ALT_OP = Suppress("|") # bnf grammar ident = Word(alphanums+"_") bnfToken = Word(alphanums+"_") + ~FollowedBy(":") repSymbol = oneOf("* +") bnfExpr = Forward() optionalTerm = Group(LBRACK + bnfExpr + RBRACK).setParseAction(makeGroupObject(OptionalGroup)) bnfTerm = ( (bnfToken | quotedString | optionalTerm | ( LPAREN + bnfExpr + RPAREN )) + Optional(repSymbol) ).setParseAction(makeGroupObject(Atom)) andList = Group(bnfTerm + OneOrMore(bnfTerm)).setParseAction(makeGroupObject(AndList)) bnfFactor = andList | bnfTerm orList = Group( bnfFactor + OneOrMore( ALT_OP + bnfFactor ) ).setParseAction(makeGroupObject(OrList)) bnfExpr << ( orList | bnfFactor ) bnfLine = ident + COLON + bnfExpr bnfComment = "#" + restOfLine # build return tokens as a dictionary bnf = Dict(OneOrMore(Group(bnfLine))) bnf.ignore(bnfComment) # bnf is defined, parse the grammar text bnfDefs = bnf.parseString(grammar) # correct answer is 78 expected = 78 assert len(bnfDefs) == expected, \ "Error, found %d BNF defns, expected %d" % (len(bnfDefs), expected) # list out defns in order they were parsed (to verify accuracy of parsing) for k,v in bnfDefs: print(k,"=",v) print() # list out parsed grammar defns (demonstrates dictionary access to parsed tokens) for k in list(bnfDefs.keys()): print(k,"=",bnfDefs[k]) pyparsing-2.1.10/examples/rangeCheck.py0000666000000000000000000000420212651540254016165 0ustar 00000000000000# rangeCheck.py # # A sample program showing how parse actions can convert parsed # strings into a data type or object, and to validate the parsed value. # # Updated to use new addCondition method and expr() copy. # # Copyright 2011,2015 Paul T. McGuire # from pyparsing import Word, nums, Suppress, ParseException, empty, Optional from datetime import datetime def ranged_value(expr, minval=None, maxval=None): # have to specify at least one range boundary if minval is None and maxval is None: raise ValueError("minval or maxval must be specified") # set range testing function and error message depending on # whether either or both min and max values are given inRangeCondition = { (True, False) : lambda s,l,t : t[0] <= maxval, (False, True) : lambda s,l,t : minval <= t[0], (False, False) : lambda s,l,t : minval <= t[0] <= maxval, }[minval is None, maxval is None] outOfRangeMessage = { (True, False) : "value is greater than %s" % maxval, (False, True) : "value is less than %s" % minval, (False, False) : "value is not in the range (%s to %s)" % (minval,maxval), }[minval is None, maxval is None] return expr().addCondition(inRangeCondition, message=outOfRangeMessage) # define the expressions for a date of the form YYYY/MM/DD or YYYY/MM (assumes YYYY/MM/01) integer = Word(nums).setName("integer") integer.setParseAction(lambda t:int(t[0])) month = ranged_value(integer, 1, 12) day = ranged_value(integer, 1, 31) year = ranged_value(integer, 2000, None) SLASH = Suppress('/') dateExpr = year("year") + SLASH + month("month") + Optional(SLASH + day("day")) dateExpr.setName("date") # convert date fields to datetime (also validates dates as truly valid dates) dateExpr.setParseAction(lambda t: datetime(t.year, t.month, t.day or 1).date()) # add range checking on dates mindate = datetime(2002,1,1).date() maxdate = datetime.now().date() dateExpr = ranged_value(dateExpr, mindate, maxdate) dateExpr.runTests(""" 2011/5/8 2001/1/1 2004/2/29 2004/2 1999/12/31""") pyparsing-2.1.10/examples/readJson.py0000666000000000000000000036137312466013312015711 0ustar 00000000000000 #~ url = "http://cmsdoc.cern.ch/cms/test/aprom/phedex/dev/gowri/datasvc/tbedi/requestDetails" #~ params = {'format':'json'} #~ import urllib #~ eparams = urllib.urlencode(params) #~ import urllib2 #~ request = urllib2.Request(url,eparams) #~ response = urllib2.urlopen(request) #~ s = response.read() #~ response.close() #~ print s s = """ {"phedex":{"request":[{"last_update":"1188037561", "numofapproved":"1", "id":"7425"}, {"last_update":"1188751826", "numofapproved":"1", "id":"8041"}, {"last_update":"1190116795", "numofapproved":"1", "id":"9281"}, {"last_update":"1190248781", "numofapproved":"1", "id":"9521"}, {"last_update":"1192615612", "numofapproved":"1", "id":"12821"}, {"last_update":"1192729887", "numofapproved":"1", "id":"13121"}, {"last_update":"1193152971", "numofapproved":"1", "id":"13501"}, {"last_update":"1194022054", "numofapproved":"1", "id":"14782"}, {"last_update":"1194429365", "numofapproved":"1", "id":"15081"}, {"last_update":"1195069848", "numofapproved":"1", "id":"16661"}, {"last_update":"1178403225", "numofapproved":"1", "id":"1281"}, {"last_update":"1179239056", "numofapproved":"1", "id":"1387"}, {"last_update":"1179842205", "numofapproved":"1", "id":"1665"}, {"last_update":"1179842040", "numofapproved":"1", "id":"1661"}, {"last_update":"1179935333", "numofapproved":"1", "id":"1741"}, {"last_update":"1183151195", "numofapproved":"1", "id":"3841"}, {"last_update":"1187031531", "numofapproved":"1", "id":"6601"}, {"last_update":"1188820478", "numofapproved":"1", "id":"8121"}, {"last_update":"1190652719", "numofapproved":"1", "id":"9983"}, {"last_update":"1192628950", "numofapproved":"1", "id":"12841"}, {"last_update":"1193075426", "numofapproved":"1", "id":"13341"}, {"last_update":"1194214609", "numofapproved":"1", "id":"14882"}, {"last_update":"1194387864", "numofapproved":"1", "id":"15062"}, {"last_update":"1195134504", "numofapproved":"1", "id":"16741"}, {"last_update":"1182431453", "numofapproved":"1", "id":"3421"}, {"last_update":"1183448188", "numofapproved":"1", "id":"4061"}, {"last_update":"1184588081", "numofapproved":"1", "id":"4908"}, {"last_update":"1184681258", 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"numofapproved":"1", "id":"13421"}, {"last_update":"1195104657", "numofapproved":"1", "id":"16701"}], "request_timestamp":1206363392.08521, "request_call":"requestDetails", "instance":"tbedi", "call_time":"0.10059", "request_date":"2008-03-2412:56:32 UTC", "request_url":"http://cmsdoc.cern.ch/cms/test/aprom/phedex/dev/gowri/datasvc/tbedi/requestDetails?format=json"}} """ from jsonParser import jsonObject data = jsonObject.parseString(s) #~ from pprint import pprint #~ pprint( data[0].asList() ) #~ print #~ print data.dump() print(data.phedex.call_time) print(data.phedex.instance) print(data.phedex.request_call) print(len(data.phedex.request)) for req in data.phedex.request[:10]: #~ print req.dump() print("-", req.id, req.last_update) pyparsing-2.1.10/examples/removeLineBreaks.py0000666000000000000000000000276412466013312017375 0ustar 00000000000000# removeLineBreaks.py # # Demonstration of the pyparsing module, converting text files # with hard line-breaks to text files with line breaks only # between paragraphs. (Helps when converting downloads from Project # Gutenberg - http://www.gutenberg.org - to import to word processing apps # that can reformat paragraphs once hard line-breaks are removed.) # # Uses parse actions and transformString to remove unwanted line breaks, # and to double up line breaks between paragraphs. # # Copyright 2006, by Paul McGuire # from pyparsing import * # define an expression for the body of a line of text - use a parse action to reject any # empty lines def mustBeNonBlank(s,l,t): if not t[0]: raise ParseException(s,l,"line body can't be empty") lineBody = SkipTo(lineEnd).setParseAction(mustBeNonBlank) # now define a line with a trailing lineEnd, to be replaced with a space character textLine = lineBody + Suppress(lineEnd).setParseAction(replaceWith(" ")) # define a paragraph, with a separating lineEnd, to be replaced with a double newline para = OneOrMore(textLine) + Suppress(lineEnd).setParseAction(replaceWith("\n\n")) # run a test test = """ Now is the time for all good men to come to the aid of their country. """ print(para.transformString(test)) # process an entire file z = para.transformString(file("Successful Methods of Public Speaking.txt").read()) file("Successful Methods of Public Speaking(2).txt","w").write(z) pyparsing-2.1.10/examples/romanNumerals.py0000666000000000000000000000444612641072051016762 0ustar 00000000000000# romanNumerals.py # # Copyright (c) 2006, Paul McGuire # from pyparsing import * def romanNumeralLiteral(numeralString, value): return Literal(numeralString).setParseAction(replaceWith(value)) one = romanNumeralLiteral("I",1) four = romanNumeralLiteral("IV",4) five = romanNumeralLiteral("V",5) nine = romanNumeralLiteral("IX",9) ten = romanNumeralLiteral("X",10) forty = romanNumeralLiteral("XL",40) fifty = romanNumeralLiteral("L",50) ninety = romanNumeralLiteral("XC",90) onehundred = romanNumeralLiteral("C",100) fourhundred = romanNumeralLiteral("CD",400) fivehundred = romanNumeralLiteral("D",500) ninehundred = romanNumeralLiteral("CM",900) onethousand = romanNumeralLiteral("M",1000) numeral = ( onethousand | ninehundred | fivehundred | fourhundred | onehundred | ninety | fifty | forty | ten | nine | five | four | one ).leaveWhitespace() romanNumeral = OneOrMore(numeral).setParseAction( lambda s,l,t : sum(t) ) # unit tests def makeRomanNumeral(n): def addDigit(n,limit,c,s): n -= limit s += c return n,s ret = "" while n >= 1000: n,ret = addDigit(n,1000,"M",ret) while n >= 900: n,ret = addDigit(n, 900,"CM",ret) while n >= 500: n,ret = addDigit(n, 500,"D",ret) while n >= 400: n,ret = addDigit(n, 400,"CD",ret) while n >= 100: n,ret = addDigit(n, 100,"C",ret) while n >= 90: n,ret = addDigit(n, 90,"XC",ret) while n >= 50: n,ret = addDigit(n, 50,"L",ret) while n >= 40: n,ret = addDigit(n, 40,"XL",ret) while n >= 10: n,ret = addDigit(n, 10,"X",ret) while n >= 9: n,ret = addDigit(n, 9,"IX",ret) while n >= 5: n,ret = addDigit(n, 5,"V",ret) while n >= 4: n,ret = addDigit(n, 4,"IV",ret) while n >= 1: n,ret = addDigit(n, 1,"I",ret) return ret tests = " ".join(makeRomanNumeral(i) for i in range(1,5000+1)) expected = 1 for t,s,e in romanNumeral.scanString(tests): if t[0] != expected: print("{} {} {}".format("==>", t, tests[s:e])) expected += 1 def test(rn): print("{} -> {}".format(rn, romanNumeral.parseString(rn)[0])) test("XVI") test("XXXIX") test("XIV") test("XIX") test("MCMLXXX") test("MMVI") pyparsing-2.1.10/examples/scanExamples.py0000666000000000000000000000447312466013312016562 0ustar 00000000000000# # scanExamples.py # # Illustration of using pyparsing's scanString,transformString, and searchString methods # # Copyright (c) 2004, 2006 Paul McGuire # from pyparsing import Word, alphas, alphanums, Literal, restOfLine, OneOrMore, \ empty, Suppress, replaceWith # simulate some C++ code testData = """ #define MAX_LOCS=100 #define USERNAME = "floyd" #define PASSWORD = "swordfish" a = MAX_LOCS; CORBA::initORB("xyzzy", USERNAME, PASSWORD ); """ ################# print("Example of an extractor") print("----------------------") # simple grammar to match #define's ident = Word(alphas, alphanums+"_") macroDef = Literal("#define") + ident.setResultsName("name") + "=" + restOfLine.setResultsName("value") for t,s,e in macroDef.scanString( testData ): print(t.name,":", t.value) # or a quick way to make a dictionary of the names and values # (return only key and value tokens, and construct dict from key-value pairs) # - empty ahead of restOfLine advances past leading whitespace, does implicit lstrip during parsing macroDef = Suppress("#define") + ident + Suppress("=") + empty + restOfLine macros = dict(list(macroDef.searchString(testData))) print("macros =", macros) print() ################# print("Examples of a transformer") print("----------------------") # convert C++ namespaces to mangled C-compatible names scopedIdent = ident + OneOrMore( Literal("::").suppress() + ident ) scopedIdent.setParseAction(lambda t: "_".join(t)) print("(replace namespace-scoped names with C-compatible names)") print(scopedIdent.transformString( testData )) # or a crude pre-processor (use parse actions to replace matching text) def substituteMacro(s,l,t): if t[0] in macros: return macros[t[0]] ident.setParseAction( substituteMacro ) ident.ignore(macroDef) print("(simulate #define pre-processor)") print(ident.transformString( testData )) ################# print("Example of a stripper") print("----------------------") from pyparsing import dblQuotedString, LineStart # remove all string macro definitions (after extracting to a string resource table?) stringMacroDef = Literal("#define") + ident + "=" + dblQuotedString + LineStart() stringMacroDef.setParseAction( replaceWith("") ) print(stringMacroDef.transformString( testData )) pyparsing-2.1.10/examples/scanYahoo.py0000666000000000000000000000070412466013312016054 0ustar 00000000000000from pyparsing import makeHTMLTags,SkipTo,htmlComment import urllib.request, urllib.parse, urllib.error serverListPage = urllib.request.urlopen( "http://www.yahoo.com" ) htmlText = serverListPage.read() serverListPage.close() aStart,aEnd = makeHTMLTags("A") link = aStart + SkipTo(aEnd).setResultsName("link") + aEnd link.ignore(htmlComment) for toks,start,end in link.scanString(htmlText): print(toks.link, "->", toks.startA.href)pyparsing-2.1.10/examples/searchparser.py0000666000000000000000000002473312641073355016632 0ustar 00000000000000"""Search query parser version 2006-03-09 This search query parser uses the excellent Pyparsing module (http://pyparsing.sourceforge.net/) to parse search queries by users. It handles: * 'and', 'or' and implicit 'and' operators; * parentheses; * quoted strings; * wildcards at the end of a search term (help*); Requirements: * Python * Pyparsing If you run this script, it will perform a number of tests. To use is as a module, you should use inheritance on the SearchQueryParser class and overwrite the Get... methods. The ParserTest class gives a very simple example of how this could work. ------------------------------------------------------------------------------- Copyright (c) 2006, Estrate, the Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Estrate nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. CONTRIBUTORS: - Steven Mooij - Rudolph Froger - Paul McGuire TODO: - add more docs - ask someone to check my English texts - add more kinds of wildcards ('*' at the beginning and '*' inside a word)? """ from pyparsing import Word, alphanums, Keyword, Group, Combine, Forward, Suppress, Optional, OneOrMore, oneOf class SearchQueryParser: def __init__(self): self._methods = { 'and': self.evaluateAnd, 'or': self.evaluateOr, 'not': self.evaluateNot, 'parenthesis': self.evaluateParenthesis, 'quotes': self.evaluateQuotes, 'word': self.evaluateWord, 'wordwildcard': self.evaluateWordWildcard, } self._parser = self.parser() def parser(self): """ This function returns a parser. The grammar should be like most full text search engines (Google, Tsearch, Lucene). Grammar: - a query consists of alphanumeric words, with an optional '*' wildcard at the end of a word - a sequence of words between quotes is a literal string - words can be used together by using operators ('and' or 'or') - words with operators can be grouped with parenthesis - a word or group of words can be preceded by a 'not' operator - the 'and' operator precedes an 'or' operator - if an operator is missing, use an 'and' operator """ operatorOr = Forward() operatorWord = Group(Combine(Word(alphanums) + Suppress('*'))).setResultsName('wordwildcard') | \ Group(Word(alphanums)).setResultsName('word') operatorQuotesContent = Forward() operatorQuotesContent << ( (operatorWord + operatorQuotesContent) | operatorWord ) operatorQuotes = Group( Suppress('"') + operatorQuotesContent + Suppress('"') ).setResultsName("quotes") | operatorWord operatorParenthesis = Group( (Suppress("(") + operatorOr + Suppress(")")) ).setResultsName("parenthesis") | operatorQuotes operatorNot = Forward() operatorNot << (Group( Suppress(Keyword("not", caseless=True)) + operatorNot ).setResultsName("not") | operatorParenthesis) operatorAnd = Forward() operatorAnd << (Group( operatorNot + Suppress(Keyword("and", caseless=True)) + operatorAnd ).setResultsName("and") | Group( operatorNot + OneOrMore(~oneOf("and or") + operatorAnd) ).setResultsName("and") | operatorNot) operatorOr << (Group( operatorAnd + Suppress(Keyword("or", caseless=True)) + operatorOr ).setResultsName("or") | operatorAnd) return operatorOr.parseString def evaluateAnd(self, argument): return self.evaluate(argument[0]).intersection(self.evaluate(argument[1])) def evaluateOr(self, argument): return self.evaluate(argument[0]).union(self.evaluate(argument[1])) def evaluateNot(self, argument): return self.GetNot(self.evaluate(argument[0])) def evaluateParenthesis(self, argument): return self.evaluate(argument[0]) def evaluateQuotes(self, argument): """Evaluate quoted strings First is does an 'and' on the indidual search terms, then it asks the function GetQuoted to only return the subset of ID's that contain the literal string. """ r = set() search_terms = [] for item in argument: search_terms.append(item[0]) if len(r) == 0: r = self.evaluate(item) else: r = r.intersection(self.evaluate(item)) return self.GetQuotes(' '.join(search_terms), r) def evaluateWord(self, argument): return self.GetWord(argument[0]) def evaluateWordWildcard(self, argument): return self.GetWordWildcard(argument[0]) def evaluate(self, argument): return self._methods[argument.getName()](argument) def Parse(self, query): #print self._parser(query)[0] return self.evaluate(self._parser(query)[0]) def GetWord(self, word): return set() def GetWordWildcard(self, word): return set() def GetQuotes(self, search_string, tmp_result): return set() def GetNot(self, not_set): return set().difference(not_set) class ParserTest(SearchQueryParser): """Tests the parser with some search queries tests containts a dictionary with tests and expected results. """ tests = { 'help': set([1, 2, 4, 5]), 'help or hulp': set([1, 2, 3, 4, 5]), 'help and hulp': set([2]), 'help hulp': set([2]), 'help and hulp or hilp': set([2, 3, 4]), 'help or hulp and hilp': set([1, 2, 3, 4, 5]), 'help or hulp or hilp or halp': set([1, 2, 3, 4, 5, 6]), '(help or hulp) and (hilp or halp)': set([3, 4, 5]), 'help and (hilp or halp)': set([4, 5]), '(help and (hilp or halp)) or hulp': set([2, 3, 4, 5]), 'not help': set([3, 6, 7, 8]), 'not hulp and halp': set([5, 6]), 'not (help and halp)': set([1, 2, 3, 4, 6, 7, 8]), '"help me please"': set([2]), '"help me please" or hulp': set([2, 3]), '"help me please" or (hulp and halp)': set([2]), 'help*': set([1, 2, 4, 5, 8]), 'help or hulp*': set([1, 2, 3, 4, 5]), 'help* and hulp': set([2]), 'help and hulp* or hilp': set([2, 3, 4]), 'help* or hulp or hilp or halp': set([1, 2, 3, 4, 5, 6, 8]), '(help or hulp*) and (hilp* or halp)': set([3, 4, 5]), 'help* and (hilp* or halp*)': set([4, 5]), '(help and (hilp* or halp)) or hulp*': set([2, 3, 4, 5]), 'not help* and halp': set([6]), 'not (help* and helpe*)': set([1, 2, 3, 4, 5, 6, 7]), '"help* me please"': set([2]), '"help* me* please" or hulp*': set([2, 3]), '"help me please*" or (hulp and halp)': set([2]), '"help me please" not (hulp and halp)': set([2]), '"help me please" hulp': set([2]), 'help and hilp and not holp': set([4]), 'help hilp not holp': set([4]), 'help hilp and not holp': set([4]), } docs = { 1: 'help', 2: 'help me please hulp', 3: 'hulp hilp', 4: 'help hilp', 5: 'halp thinks he needs help', 6: 'he needs halp', 7: 'nothing', 8: 'helper', } index = { 'help': set((1, 2, 4, 5)), 'me': set((2,)), 'please': set((2,)), 'hulp': set((2, 3,)), 'hilp': set((3, 4,)), 'halp': set((5, 6,)), 'thinks': set((5,)), 'he': set((5, 6,)), 'needs': set((5, 6,)), 'nothing': set((7,)), 'helper': set((8,)), } def GetWord(self, word): if (word in self.index): return self.index[word] else: return set() def GetWordWildcard(self, word): result = set() for item in list(self.index.keys()): if word == item[0:len(word)]: result = result.union(self.index[item]) return result def GetQuotes(self, search_string, tmp_result): result = set() for item in tmp_result: if self.docs[item].count(search_string): result.add(item) return result def GetNot(self, not_set): all = set(list(self.docs.keys())) return all.difference(not_set) def Test(self): all_ok = True for item in list(self.tests.keys()): print(item) r = self.Parse(item) e = self.tests[item] print('Result: %s' % r) print('Expect: %s' % e) if e == r: print('Test OK') else: all_ok = False print('>>>>>>>>>>>>>>>>>>>>>>Test ERROR<<<<<<<<<<<<<<<<<<<<<') print('') return all_ok if __name__=='__main__': if ParserTest().Test(): print('All tests OK') else: print('One or more tests FAILED') pyparsing-2.1.10/examples/searchParserAppDemo.py0000666000000000000000000000165112641056472020033 0ustar 00000000000000from searchparser import SearchQueryParser products = [ "grape juice", "grape jelly", "orange juice", "orange jujubees", "strawberry jam", "prune juice", "prune butter", "orange marmalade", "grapefruit juice" ] class FruitSearchParser(SearchQueryParser): def GetWord(self, word): return set( p for p in products if p.startswith(word + " ") ) def GetWordWildcard(self, word): return set( p for p in products if p.startswith(word[:-1]) ) def GetQuotes(self, search_string, tmp_result): result = Set() # I have no idea how to use this feature... return result def GetNot(self, not_set): return set( products ) - not_set parser = FruitSearchParser() tests = """\ grape or orange grape* not(grape*) prune and grape""".splitlines() for t in tests: print(t.strip()) print(parser.Parse(t)) print('')pyparsing-2.1.10/examples/select_parser.py0000666000000000000000000001375512765654357017023 0ustar 00000000000000# select_parser.py # Copyright 2010, Paul McGuire # # a simple SELECT statement parser, taken from SQLite's SELECT statement # definition at http://www.sqlite.org/lang_select.html # from pyparsing import * ParserElement.enablePackrat() LPAR,RPAR,COMMA = map(Suppress,"(),") select_stmt = Forward().setName("select statement") # keywords (UNION, ALL, AND, INTERSECT, EXCEPT, COLLATE, ASC, DESC, ON, USING, NATURAL, INNER, CROSS, LEFT, OUTER, JOIN, AS, INDEXED, NOT, SELECT, DISTINCT, FROM, WHERE, GROUP, BY, HAVING, ORDER, BY, LIMIT, OFFSET, OR) = map(CaselessKeyword, """UNION, ALL, AND, INTERSECT, EXCEPT, COLLATE, ASC, DESC, ON, USING, NATURAL, INNER, CROSS, LEFT, OUTER, JOIN, AS, INDEXED, NOT, SELECT, DISTINCT, FROM, WHERE, GROUP, BY, HAVING, ORDER, BY, LIMIT, OFFSET, OR""".replace(",","").split()) (CAST, ISNULL, NOTNULL, NULL, IS, BETWEEN, ELSE, END, CASE, WHEN, THEN, EXISTS, COLLATE, IN, LIKE, GLOB, REGEXP, MATCH, ESCAPE, CURRENT_TIME, CURRENT_DATE, CURRENT_TIMESTAMP) = map(CaselessKeyword, """CAST, ISNULL, NOTNULL, NULL, IS, BETWEEN, ELSE, END, CASE, WHEN, THEN, EXISTS, COLLATE, IN, LIKE, GLOB, REGEXP, MATCH, ESCAPE, CURRENT_TIME, CURRENT_DATE, CURRENT_TIMESTAMP""".replace(",","").split()) keyword = MatchFirst((UNION, ALL, INTERSECT, EXCEPT, COLLATE, ASC, DESC, ON, USING, NATURAL, INNER, CROSS, LEFT, OUTER, JOIN, AS, INDEXED, NOT, SELECT, DISTINCT, FROM, WHERE, GROUP, BY, HAVING, ORDER, BY, LIMIT, OFFSET, CAST, ISNULL, NOTNULL, NULL, IS, BETWEEN, ELSE, END, CASE, WHEN, THEN, EXISTS, COLLATE, IN, LIKE, GLOB, REGEXP, MATCH, ESCAPE, CURRENT_TIME, CURRENT_DATE, CURRENT_TIMESTAMP)) identifier = ~keyword + Word(alphas, alphanums+"_") collation_name = identifier.copy() column_name = identifier.copy() column_alias = identifier.copy() table_name = identifier.copy() table_alias = identifier.copy() index_name = identifier.copy() function_name = identifier.copy() parameter_name = identifier.copy() database_name = identifier.copy() # expression expr = Forward().setName("expression") integer = Regex(r"[+-]?\d+") numeric_literal = Regex(r"\d+(\.\d*)?([eE][+-]?\d+)?") string_literal = QuotedString("'") blob_literal = Regex(r"[xX]'[0-9A-Fa-f]+'") literal_value = ( numeric_literal | string_literal | blob_literal | NULL | CURRENT_TIME | CURRENT_DATE | CURRENT_TIMESTAMP ) bind_parameter = ( Word("?",nums) | Combine(oneOf(": @ $") + parameter_name) ) type_name = oneOf("TEXT REAL INTEGER BLOB NULL") expr_term = ( CAST + LPAR + expr + AS + type_name + RPAR | EXISTS + LPAR + select_stmt + RPAR | function_name.setName("function_name") + LPAR + Optional("*" | delimitedList(expr)) + RPAR | literal_value | bind_parameter | Combine(identifier+('.'+identifier)*(0,2)).setName("ident") ) UNARY,BINARY,TERNARY=1,2,3 expr << infixNotation(expr_term, [ (oneOf('- + ~') | NOT, UNARY, opAssoc.RIGHT), (ISNULL | NOTNULL | NOT + NULL, UNARY, opAssoc.LEFT), ('||', BINARY, opAssoc.LEFT), (oneOf('* / %'), BINARY, opAssoc.LEFT), (oneOf('+ -'), BINARY, opAssoc.LEFT), (oneOf('<< >> & |'), BINARY, opAssoc.LEFT), (oneOf('< <= > >='), BINARY, opAssoc.LEFT), (oneOf('= == != <>') | IS | IN | LIKE | GLOB | MATCH | REGEXP, BINARY, opAssoc.LEFT), ((BETWEEN,AND), TERNARY, opAssoc.LEFT), (IN + LPAR + Group(select_stmt | delimitedList(expr)) + RPAR, UNARY, opAssoc.LEFT), (AND, BINARY, opAssoc.LEFT), (OR, BINARY, opAssoc.LEFT), ]) compound_operator = (UNION + Optional(ALL) | INTERSECT | EXCEPT) ordering_term = Group(expr('order_key') + Optional(COLLATE + collation_name('collate')) + Optional(ASC | DESC)('direction')) join_constraint = Group(Optional(ON + expr | USING + LPAR + Group(delimitedList(column_name)) + RPAR)) join_op = COMMA | Group(Optional(NATURAL) + Optional(INNER | CROSS | LEFT + OUTER | LEFT | OUTER) + JOIN) join_source = Forward() single_source = ( (Group(database_name("database") + "." + table_name("table*")) | table_name("table*")) + Optional(Optional(AS) + table_alias("table_alias*")) + Optional(INDEXED + BY + index_name("name") | NOT + INDEXED)("index") | (LPAR + select_stmt + RPAR + Optional(Optional(AS) + table_alias)) | (LPAR + join_source + RPAR) ) join_source << (Group(single_source + OneOrMore(join_op + single_source + join_constraint)) | single_source) result_column = "*" | table_name + "." + "*" | Group(expr + Optional(Optional(AS) + column_alias)) select_core = (SELECT + Optional(DISTINCT | ALL) + Group(delimitedList(result_column))("columns") + Optional(FROM + join_source("from*")) + Optional(WHERE + expr("where_expr")) + Optional(GROUP + BY + Group(delimitedList(ordering_term)("group_by_terms")) + Optional(HAVING + expr("having_expr")))) select_stmt << (select_core + ZeroOrMore(compound_operator + select_core) + Optional(ORDER + BY + Group(delimitedList(ordering_term))("order_by_terms")) + Optional(LIMIT + (Group(expr + OFFSET + expr) | Group(expr + COMMA + expr) | expr)("limit"))) tests = """\ select * from xyzzy where z > 100 select * from xyzzy where z > 100 order by zz select * from xyzzy select z.* from xyzzy select a, b from test_table where 1=1 and b='yes' select a, b from test_table where 1=1 and b in (select bb from foo) select z.a, b from test_table where 1=1 and b in (select bb from foo) select z.a, b from test_table where 1=1 and b in (select bb from foo) order by b,c desc,d select z.a, b from test_table left join test2_table where 1=1 and b in (select bb from foo) select a, db.table.b as BBB from db.table where 1=1 and BBB='yes' select a, db.table.b as BBB from test_table,db.table where 1=1 and BBB='yes' select a, db.table.b as BBB from test_table,db.table where 1=1 and BBB='yes' limit 50 """ select_stmt.runTests(tests) pyparsing-2.1.10/examples/Setup.ini0000666000000000000000000000264512466013312015365 0ustar 00000000000000[Startup] AppName=M3i.comm stname = Utility modemid=125D&DEV_1999 audioid=125D&DEV_1998 win98path= winmepath= win2kpath= winxppath= win95path= winnt4path= stupgrade =Install/Upgrade Drivers stuninstall =Uninstall Drivers stchoose =Choose One Function to Process stchoosez3 =Choose Devices to Process copycompl =Copying files completed RemString1=Set up has finished remove ESS device driver and cleaned your system. Click Finish to exit. RemString2=ESS devices is removed completely.No need to reboot. If you want to reinstall, run the setup again with driver package. stshowmsg1=Setup will clean the installed files and update registry. stshowmsg2=Setup is updating system's registry .... stshowmsg3=Setup is starting sysdriver=es56cvmp.sys mdmzn=mdmm3com.inf mdmznp=esmdm_98.inf mdmzna=mdmessa.inf spkname=essspk.exe remvess=remvess.exe slmcat=allem3m.cat audiocat=allem3.cat audioinf=M3i sysaudio=es198xdl.sys audiovxd=es198x.vxd [Languages] Default=0x0009 count=30 key0=0x002d key1=0x0003 key2=0x0804 key3=0x0404 key4=0x001a key5=0x0005 key6=0x0006 key7=0x0013 key8=0x0009 key9=0x000b key10=0x0c0c key11=0x040c key12=0x0007 key13=0x0008 key14=0x000e key15=0x0021 key16=0x0010 key17=0x0011 key18=0x0012 key19=0x0014 key20=0x0015 key21=0x0416 key22=0x0816 key23=0x0019 key24=0x001b key25=0x0024 key26=0x000a key27=0x001d key28=0x001e key29=0x001f [test] foo=bar pyparsing-2.1.10/examples/sexpParser.py0000666000000000000000000001260012466013312016262 0ustar 00000000000000# sexpParser.py # # Demonstration of the pyparsing module, implementing a simple S-expression # parser. # # Updates: # November, 2011 - fixed errors in precedence of alternatives in simpleString; # fixed exception raised in verifyLen to properly signal the input string # and exception location so that markInputline works correctly; fixed # definition of decimal to accept a single '0' and optional leading '-' # sign; updated tests to improve parser coverage # # Copyright 2007-2011, by Paul McGuire # """ BNF reference: http://theory.lcs.mit.edu/~rivest/sexp.txt :: | :: ? ; :: | | | | ; :: "[" "]" ; :: ":" ; :: + ; -- decimal numbers should have no unnecessary leading zeros -- any string of bytes, of the indicated length :: + ; :: ? "|" ( | )* "|" ; :: "#" ( | )* "#" ; :: ? :: "\"" "\"" :: "(" ( | )* ")" ; :: * ; :: | | ; :: | | ; :: "a" | ... | "z" ; :: "A" | ... | "Z" ; :: "0" | ... | "9" ; :: | "A" | ... | "F" | "a" | ... | "f" ; :: "-" | "." | "/" | "_" | ":" | "*" | "+" | "=" ; :: " " | "\t" | "\r" | "\n" ; :: | | "+" | "/" | "=" ; :: "" ; """ from pyparsing import * from base64 import b64decode import pprint def verifyLen(s,l,t): t = t[0] if t.len is not None: t1len = len(t[1]) if t1len != t.len: raise ParseFatalException(s,l,\ "invalid data of length %d, expected %s" % (t1len, t.len)) return t[1] # define punctuation literals LPAR, RPAR, LBRK, RBRK, LBRC, RBRC, VBAR = map(Suppress, "()[]{}|") decimal = Regex(r'0|[1-9]\d*').setParseAction(lambda t: int(t[0])) hexadecimal = ("#" + OneOrMore(Word(hexnums)) + "#")\ .setParseAction(lambda t: int("".join(t[1:-1]),16)) bytes = Word(printables) raw = Group(decimal("len") + Suppress(":") + bytes).setParseAction(verifyLen) token = Word(alphanums + "-./_:*+=") base64_ = Group(Optional(decimal|hexadecimal,default=None)("len") + VBAR + OneOrMore(Word( alphanums +"+/=" )).setParseAction(lambda t: b64decode("".join(t))) + VBAR).setParseAction(verifyLen) qString = Group(Optional(decimal,default=None)("len") + dblQuotedString.setParseAction(removeQuotes)).setParseAction(verifyLen) simpleString = base64_ | raw | decimal | token | hexadecimal | qString # extended definitions decimal = Regex(r'-?0|[1-9]\d*').setParseAction(lambda t: int(t[0])) real = Regex(r"[+-]?\d+\.\d*([eE][+-]?\d+)?").setParseAction(lambda tokens: float(tokens[0])) token = Word(alphanums + "-./_:*+=!<>") simpleString = real | base64_ | raw | decimal | token | hexadecimal | qString display = LBRK + simpleString + RBRK string_ = Optional(display) + simpleString sexp = Forward() sexpList = Group(LPAR + ZeroOrMore(sexp) + RPAR) sexp << ( string_ | sexpList ) ######### Test data ########### test00 = """(snicker "abc" (#03# |YWJj|))""" test01 = """(certificate (issuer (name (public-key rsa-with-md5 (e 15 |NFGq/E3wh9f4rJIQVXhS|) (n |d738/4ghP9rFZ0gAIYZ5q9y6iskDJwASi5rEQpEQq8ZyMZeIZzIAR2I5iGE=|)) aid-committee)) (subject (ref (public-key rsa-with-md5 (e |NFGq/E3wh9f4rJIQVXhS|) (n |d738/4ghP9rFZ0gAIYZ5q9y6iskDJwASi5rEQpEQq8ZyMZeIZzIAR2I5iGE=|)) tom mother)) (not-before "1997-01-01_09:00:00") (not-after "1998-01-01_09:00:00") (tag (spend (account "12345678") (* numeric range "1" "1000")))) """ test02 = """(lambda (x) (* x x))""" test03 = """(def length (lambda (x) (cond ((not x) 0) ( t (+ 1 (length (cdr x)))) ) ) ) """ test04 = """(2:XX "abc" (#03# |YWJj|))""" test05 = """(if (is (window_name) "XMMS") (set_workspace 2))""" test06 = """(if (and (is (application_name) "Firefox") (or (contains (window_name) "Enter name of file to save to") (contains (window_name) "Save As") (contains (window_name) "Save Image") () ) ) (geometry "+140+122") ) """ test07 = """(defun factorial (x) (if (zerop x) 1 (* x (factorial (- x 1))))) """ test51 = """(2:XX "abc" (#30# |YWJj|))""" test51error = """(3:XX "abc" (#30# |YWJj|))""" test52 = """ (and (or (> uid 1000) (!= gid 20) ) (> quota 5.0e+03) ) """ # Run tests t = None alltests = [ locals()[t] for t in sorted(locals()) if t.startswith("test") ] for t in alltests: print('-'*50) print(t) try: sexpr = sexp.parseString(t, parseAll=True) pprint.pprint(sexpr.asList()) except ParseFatalException as pfe: print("Error:", pfe.msg) print(pfe.markInputline('^')) print() pyparsing-2.1.10/examples/shapes.py0000666000000000000000000000326312466013312015416 0ustar 00000000000000# shapes.py # # A sample program showing how parse actions can convert parsed # strings into a data type or object. # # Copyright 2012, Paul T. McGuire # # define class hierarchy of Shape classes, with polymorphic area method class Shape(object): def __init__(self, tokens): self.__dict__.update(tokens.asDict()) def area(self): raise NotImplementedException() def __str__(self): return "<%s>: %s" % (self.__class__.__name__, self.__dict__) class Square(Shape): def area(self): return self.side**2 class Rectangle(Shape): def area(self): return self.width * self.height class Circle(Shape): def area(self): return 3.14159 * self.radius**2 from pyparsing import * number = Regex(r'-?\d+(\.\d*)?').setParseAction(lambda t:float(t[0])) # Shape expressions: # square : S # rectangle: R # circle : C squareDefn = "S" + number('centerx') + number('centery') + number('side') rectDefn = "R" + number('centerx') + number('centery') + number('width') + number('height') circleDefn = "C" + number('centerx') + number('centery') + number('diameter') squareDefn.setParseAction(Square) rectDefn.setParseAction(Rectangle) def computeRadius(tokens): tokens['radius'] = tokens.diameter/2.0 circleDefn.setParseAction(computeRadius, Circle) shapeExpr = squareDefn | rectDefn | circleDefn tests = """\ C 0 0 100 R 10 10 20 50 S -1 5 10""".splitlines() for t in tests: shape = shapeExpr.parseString(t)[0] print(shape) print("Area:", shape.area()) print() pyparsing-2.1.10/examples/simpleArith.py0000666000000000000000000000437412655554431016434 0ustar 00000000000000# # simpleArith.py # # Example of defining an arithmetic expression parser using # the infixNotation helper method in pyparsing. # # Copyright 2006, by Paul McGuire # from pyparsing import * integer = Word(nums).setParseAction(lambda t:int(t[0])) variable = Word(alphas,exact=1) operand = integer | variable expop = Literal('^') signop = oneOf('+ -') multop = oneOf('* /') plusop = oneOf('+ -') factop = Literal('!') # To use the infixNotation helper: # 1. Define the "atom" operand term of the grammar. # For this simple grammar, the smallest operand is either # and integer or a variable. This will be the first argument # to the infixNotation method. # 2. Define a list of tuples for each level of operator # precendence. Each tuple is of the form # (opExpr, numTerms, rightLeftAssoc, parseAction), where # - opExpr is the pyparsing expression for the operator; # may also be a string, which will be converted to a Literal # - numTerms is the number of terms for this operator (must # be 1 or 2) # - rightLeftAssoc is the indicator whether the operator is # right or left associative, using the pyparsing-defined # constants opAssoc.RIGHT and opAssoc.LEFT. # - parseAction is the parse action to be associated with # expressions matching this operator expression (the # parse action tuple member may be omitted) # 3. Call infixNotation passing the operand expression and # the operator precedence list, and save the returned value # as the generated pyparsing expression. You can then use # this expression to parse input strings, or incorporate it # into a larger, more complex grammar. # expr = infixNotation( operand, [("!", 1, opAssoc.LEFT), ("^", 2, opAssoc.RIGHT), (signop, 1, opAssoc.RIGHT), (multop, 2, opAssoc.LEFT), (plusop, 2, opAssoc.LEFT),] ) test = ["9 + 2 + 3", "9 + 2 * 3", "(9 + 2) * 3", "(9 + -2) * 3", "(9 + -2) * 3^2^2", "(9! + -2) * 3^2^2", "M*X + B", "M*(X + B)", "1+2*-3^4*5+-+-6",] for t in test: print(t) print(expr.parseString(t)) print('') pyparsing-2.1.10/examples/simpleBool.py0000666000000000000000000000547012466013312016242 0ustar 00000000000000# # simpleBool.py # # Example of defining a boolean logic parser using # the operatorGrammar helper method in pyparsing. # # In this example, parse actions associated with each # operator expression will "compile" the expression # into BoolXXX class instances, which can then # later be evaluated for their boolean value. # # Copyright 2006, by Paul McGuire # Updated 2013-Sep-14 - improved Python 2/3 cross-compatibility # from pyparsing import infixNotation, opAssoc, Keyword, Word, alphas # define classes to be built at parse time, as each matching # expression type is parsed class BoolOperand(object): def __init__(self,t): self.label = t[0] self.value = eval(t[0]) def __bool__(self): return self.value def __str__(self): return self.label __repr__ = __str__ __nonzero__ = __bool__ class BoolBinOp(object): def __init__(self,t): self.args = t[0][0::2] def __str__(self): sep = " %s " % self.reprsymbol return "(" + sep.join(map(str,self.args)) + ")" def __bool__(self): return self.evalop(bool(a) for a in self.args) __nonzero__ = __bool__ __repr__ = __str__ class BoolAnd(BoolBinOp): reprsymbol = '&' evalop = all class BoolOr(BoolBinOp): reprsymbol = '|' evalop = any class BoolNot(object): def __init__(self,t): self.arg = t[0][1] def __bool__(self): v = bool(self.arg) return not v def __str__(self): return "~" + str(self.arg) __repr__ = __str__ __nonzero__ = __bool__ TRUE = Keyword("True") FALSE = Keyword("False") boolOperand = TRUE | FALSE | Word(alphas,max=1) boolOperand.setParseAction(BoolOperand) # define expression, based on expression operand and # list of operations in precedence order boolExpr = infixNotation( boolOperand, [ ("not", 1, opAssoc.RIGHT, BoolNot), ("and", 2, opAssoc.LEFT, BoolAnd), ("or", 2, opAssoc.LEFT, BoolOr), ]) if __name__ == "__main__": p = True q = False r = True tests = [("p", True), ("q", False), ("p and q", False), ("p and not q", True), ("not not p", True), ("not(p and q)", True), ("q or not p and r", False), ("q or not p or not r", False), ("q or not (p and r)", False), ("p or q or r", True), ("p or q or r and False", True), ("(p or q or r) and False", False), ] print("p =", p) print("q =", q) print("r =", r) print() for t,expected in tests: res = boolExpr.parseString(t)[0] success = "PASS" if bool(res) == expected else "FAIL" print (t,'\n', res, '=', bool(res),'\n', success, '\n') pyparsing-2.1.10/examples/SimpleCalc.py0000666000000000000000000000605312466013312016147 0ustar 00000000000000# SimpleCalc.py # # Demonstration of the parsing module, # Sample usage # # $ python SimpleCalc.py # Type in the string to be parse or 'quit' to exit the program # > g=67.89 + 7/5 # 69.29 # > g # 69.29 # > h=(6*g+8.8)-g # 355.25 # > h + 1 # 356.25 # > 87.89 + 7/5 # 89.29 # > ans+10 # 99.29 # > quit # Good bye! # # # Uncomment the line below for readline support on interactive terminal # import readline from pyparsing import ParseException, Word, alphas, alphanums import math # Debugging flag can be set to either "debug_flag=True" or "debug_flag=False" debug_flag=False variables = {} from fourFn import BNF, exprStack, fn, opn def evaluateStack( s ): op = s.pop() if op == 'unary -': return -evaluateStack( s ) if op in "+-*/^": op2 = evaluateStack( s ) op1 = evaluateStack( s ) return opn[op]( op1, op2 ) elif op == "PI": return math.pi # 3.1415926535 elif op == "E": return math.e # 2.718281828 elif op in fn: return fn[op]( evaluateStack( s ) ) elif op[0].isalpha(): if op in variables: return variables[op] raise Exception("invalid identifier '%s'" % op) else: return float( op ) arithExpr = BNF() ident = Word(alphas, alphanums).setName("identifier") assignment = ident("varname") + '=' + arithExpr pattern = assignment | arithExpr if __name__ == '__main__': # input_string input_string='' # Display instructions on how to quit the program print("Type in the string to be parsed or 'quit' to exit the program") input_string = input("> ") while input_string != 'quit': if input_string.lower() == 'debug': debug_flag=True input_string = input("> ") continue # Reset to an empty exprStack del exprStack[:] if input_string != '': # try parsing the input string try: L=pattern.parseString( input_string, parseAll=True ) except ParseException as err: L=['Parse Failure',input_string] # show result of parsing the input string if debug_flag: print(input_string, "->", L) if len(L)==0 or L[0] != 'Parse Failure': if debug_flag: print("exprStack=", exprStack) # calculate result , store a copy in ans , display the result to user try: result=evaluateStack(exprStack) except Exception as e: print(str(e)) else: variables['ans']=result print(result) # Assign result to a variable if required if L.varname: variables[L.varname] = result if debug_flag: print("variables=",variables) else: print('Parse Failure') print(err.line) print(" "*(err.column-1) + "^") print(err) # obtain new input string input_string = input("> ") # if user type 'quit' then say goodbye print("Good bye!") pyparsing-2.1.10/examples/simpleSQL.py0000666000000000000000000000572212766435261016024 0ustar 00000000000000# simpleSQL.py # # simple demo of using the parsing library to do simple-minded SQL parsing # could be extended to include where clauses etc. # # Copyright (c) 2003,2016, Paul McGuire # from pyparsing import Literal, CaselessLiteral, Word, delimitedList, Optional, \ Combine, Group, alphas, nums, alphanums, ParseException, Forward, oneOf, quotedString, \ ZeroOrMore, restOfLine, CaselessKeyword, pyparsing_common # define SQL tokens selectStmt = Forward() SELECT, FROM, WHERE = map(CaselessKeyword, "select from where".split()) ident = Word( alphas, alphanums + "_$" ).setName("identifier") columnName = delimitedList(ident, ".", combine=True).setName("column name") columnName.addParseAction(pyparsing_common.upcaseTokens) columnNameList = Group( delimitedList(columnName)) tableName = delimitedList(ident, ".", combine=True).setName("table name") tableName.addParseAction(pyparsing_common.upcaseTokens) tableNameList = Group(delimitedList(tableName)) whereExpression = Forward() and_, or_, in_ = map(CaselessKeyword, "and or in".split()) binop = oneOf("= != < > >= <= eq ne lt le gt ge", caseless=True) realNum = pyparsing_common.real() intNum = pyparsing_common.signed_integer() columnRval = realNum | intNum | quotedString | columnName # need to add support for alg expressions whereCondition = Group( ( columnName + binop + columnRval ) | ( columnName + in_ + "(" + delimitedList( columnRval ) + ")" ) | ( columnName + in_ + "(" + selectStmt + ")" ) | ( "(" + whereExpression + ")" ) ) whereExpression << whereCondition + ZeroOrMore( ( and_ | or_ ) + whereExpression ) # define the grammar selectStmt <<= (SELECT + ('*' | columnNameList)("columns") + FROM + tableNameList( "tables" ) + Optional(Group(WHERE + whereExpression), "")("where")) simpleSQL = selectStmt # define Oracle comment format, and ignore them oracleSqlComment = "--" + restOfLine simpleSQL.ignore( oracleSqlComment ) if __name__ == "__main__": simpleSQL.runTests("""\ # multiple tables SELECT * from XYZZY, ABC # dotted table name select * from SYS.XYZZY Select A from Sys.dual Select A,B,C from Sys.dual Select A, B, C from Sys.dual, Table2 # FAIL - invalid SELECT keyword Xelect A, B, C from Sys.dual # FAIL - invalid FROM keyword Select A, B, C frox Sys.dual # FAIL - incomplete statement Select # FAIL - incomplete statement Select * from # FAIL - invalid column Select &&& frox Sys.dual # where clause Select A from Sys.dual where a in ('RED','GREEN','BLUE') # compound where clause Select A from Sys.dual where a in ('RED','GREEN','BLUE') and b in (10,20,30) # where clause with comparison operator Select A,b from table1,table2 where table1.id eq table2.id""") pyparsing-2.1.10/examples/simpleWiki.py0000666000000000000000000000207212466013312016245 0ustar 00000000000000from pyparsing import * wikiInput = """ Here is a simple Wiki input: *This is in italics.* **This is in bold!** ***This is in bold italics!*** Here's a URL to {{Pyparsing's Wiki Page->http://pyparsing.wikispaces.com}} """ def convertToHTML(opening,closing): def conversionParseAction(s,l,t): return opening + t[0] + closing return conversionParseAction italicized = QuotedString("*").setParseAction(convertToHTML("","")) bolded = QuotedString("**").setParseAction(convertToHTML("","")) boldItalicized = QuotedString("***").setParseAction(convertToHTML("","")) def convertToHTML_A(s,l,t): try: text,url=t[0].split("->") except ValueError: raise ParseFatalException(s,l,"invalid URL link reference: " + t[0]) return '%s' % (url,text) urlRef = QuotedString("{{",endQuoteChar="}}").setParseAction(convertToHTML_A) wikiMarkup = urlRef | boldItalicized | bolded | italicized print(wikiInput) print() print(wikiMarkup.transformString(wikiInput)) pyparsing-2.1.10/examples/SingleForm.dfm0000666000000000000000000012532212466013312016317 0ustar 00000000000000object Form1: TForm1 Left = 161 Top = 149 Width = 696 Height = 342 Caption = 'DbxSingle' Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'MS Sans Serif' Font.Style = [] OldCreateOrder = False OnCreate = FormCreate PixelsPerInch = 96 TextHeight = 13 object ActionToolBar2: TActionToolBar Left = 0 Top = 0 Width = 688 Height = 26 ActionManager = ActionManager1 AllowHiding = False Caption = 'ActionToolBar2' ColorMap.HighlightColor = 14410210 ColorMap.BtnSelectedColor = clBtnFace ColorMap.UnusedColor = 14410210 Spacing = 0 end object PageControl1: TPageControl Left = 0 Top = 26 Width = 688 Height = 289 ActivePage = TabSheet1 Align = alClient TabOrder = 1 object TabSheet1: TTabSheet Caption = 'Data' object DBGrid1: TDBGrid Left = 0 Top = 0 Width = 680 Height = 261 Align = alClient DataSource = DataSource1 TabOrder = 0 TitleFont.Charset = DEFAULT_CHARSET TitleFont.Color = clWindowText TitleFont.Height = -11 TitleFont.Name = 'MS Sans Serif' TitleFont.Style = [] end end object TabSheet2: TTabSheet Caption = 'Log' ImageIndex = 1 object Memo1: TMemo Left = 0 Top = 0 Width = 680 Height = 399 Align = alClient TabOrder = 0 end end end object SimpleDataSet1: TSimpleDataSet Aggregates = <> Connection.ConnectionName = 'IBLocal' Connection.DriverName = 'Interbase' Connection.GetDriverFunc = 'getSQLDriverINTERBASE' Connection.LibraryName = 'dbexpint.dll' Connection.LoginPrompt = False Connection.Params.Strings = ( 'BlobSize=-1' 'CommitRetain=False' 'Database=C:\Program Files\Common Files\Borland Shared\Data\emplo' + 'yee.gdb' 'DriverName=Interbase' 'Password=masterkey' 'RoleName=RoleName' 'ServerCharSet=ASCII' 'SQLDialect=1' 'Interbase TransIsolation=ReadCommited' 'User_Name=sysdba' 'WaitOnLocks=True') Connection.VendorLib = 'GDS32.DLL' DataSet.CommandText = 'EMPLOYEE' DataSet.CommandType = ctTable DataSet.MaxBlobSize = -1 DataSet.Params = <> Params = <> AfterPost = DoUpdate BeforeDelete = DoUpdate Left = 104 Top = 56 end object ActionManager1: TActionManager ActionBars = < item Items.CaptionOptions = coAll Items = < item Action = DataSetFirst1 ImageIndex = 0 end item Action = DataSetPrior1 ImageIndex = 1 end item Action = DataSetNext1 ImageIndex = 2 end item Action = DataSetLast1 ImageIndex = 3 end item Action = DataSetInsert1 ImageIndex = 4 end item Action = DataSetDelete1 ImageIndex = 5 end item Action = DataSetEdit1 ImageIndex = 6 end item Action = DataSetPost1 ImageIndex = 7 end item Action = DataSetCancel1 ImageIndex = 8 end item Action = DataSetRefresh1 ImageIndex = 9 end> ActionBar = ActionToolBar2 end> Images = ImageList1 Left = 112 Top = 184 StyleName = 'XP Style' object DataSetFirst1: TDataSetFirst Category = 'Dataset' Caption = 'First' ImageIndex = 0 end object DataSetPrior1: TDataSetPrior Category = 'Dataset' Caption = 'Prior' ImageIndex = 1 end object DataSetNext1: TDataSetNext Category = 'Dataset' Caption = 'Next' ImageIndex = 2 end object DataSetLast1: TDataSetLast Category = 'Dataset' Caption = 'Last' ImageIndex = 3 end object DataSetInsert1: TDataSetInsert Category = 'Dataset' Caption = 'Insert' ImageIndex = 4 end object DataSetDelete1: TDataSetDelete Category = 'Dataset' Caption = 'Delete' ImageIndex = 5 end object DataSetEdit1: TDataSetEdit Category = 'Dataset' Caption = 'Edit' ImageIndex = 6 end object DataSetPost1: TDataSetPost Category = 'Dataset' Caption = 'Post' ImageIndex = 7 end object DataSetCancel1: TDataSetCancel 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FFFFFFFF8031F807FFFFFC7F8031F807F3E7F0FF8031F807F1C7F1FF8001F807 F88FE3FF8001F807FC1FE7FF8001F80FFE3FE7078FF1FF7FFC1FE3878FF1FE3F F88FE1078FF1FC1FF1C7F0078FF1FFFFF3E7F8378FF1FEFFFFFFFFFF8FF5FFFF FFFFFFFF8001FDFFFFFFFFFFFFFF6FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC7FFFFFFFFFFBFFFC7FFFFFFFFFF1FF FC7FFFFFE007E0FFE00FE007F00FC47FE00FE007F81FCE3FE00FE007FC3FFF1F FC7FFFFFFE7FFF8FFC7FFFFFFFFFFFC7FC7FFFFFFFFFFFE7FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE7E7FF9FF9FFE7E7 E787FE1FF87FE1E7E607F81FF81FE067E007F01FF80FE007E607F81FF81FE067 E787FE1FF87FE1E7E7E7FF9FF9FFE7E7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000000000000000000000000000 000000000000} end object DataSource1: TDataSource DataSet = SimpleDataSet1 Left = 108 Top = 250 end object SQLMonitor1: TSQLMonitor OnTrace = SQLMonitor1Trace Left = 228 Top = 122 end end pyparsing-2.1.10/examples/sparser.py0000666000000000000000000003174212466013312015615 0ustar 00000000000000#!/usr/bin/env python """ NAME: sparser.py SYNOPSIS: sparser.py [options] filename DESCRIPTION: The sparser.py script is a Specified PARSER. It is unique (as far as I can tell) because it doesn't care about the delimiter(s). The user specifies what is expected, and the order, for each line of text. All of the heavy lifting is handled by pyparsing (http://pyparsing.sf.net). OPTIONS: -h,--help this message -v,--version version -d,--debug turn on debug messages EXAMPLES: 1. As standalone sparser.py myfile 2. As library import sparser ... #Copyright (C) 2006 Tim Cera timcera@earthlink.net # # # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the Free # Software Foundation; either version 2 of the License, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License # for more details. # # You should have received a copy of the GNU General Public License along # with this program; if not, write to the Free Software Foundation, Inc., # 675 Mass Ave, Cambridge, MA 02139, USA. """ #===imports====================== import sys import os import getopt import re import gzip from pyparsing import * #===globals====================== modname = "sparser" __version__ = "0.1" #--option args-- debug_p = 0 #opt_b=None #string arg, default is undefined #---positional args, default is empty--- pargs = [] #---other--- #===utilities==================== def msg(txt): """Send message to stdout.""" sys.stdout.write(txt) sys.stdout.flush() def debug(ftn, txt): """Used for debugging.""" if debug_p: sys.stdout.write("%s.%s:%s\n" % (modname, ftn, txt)) sys.stdout.flush() def fatal(ftn, txt): """If can't continue.""" msg = "%s.%s:FATAL:%s\n" % (modname, ftn, txt) raise SystemExit(msg) def usage(): """Prints the docstring.""" print(__doc__) #==================================== class ToInteger(TokenConverter): """Converter to make token into an integer.""" def postParse( self, instring, loc, tokenlist ): return int(tokenlist[0]) class ToFloat(TokenConverter): """Converter to make token into a float.""" def postParse( self, instring, loc, tokenlist ): return float(tokenlist[0]) class ParseFileLineByLine: """ Bring data from text files into a program, optionally parsing each line according to specifications in a parse definition file. ParseFileLineByLine instances can be used like normal file objects (i.e. by calling readline(), readlines(), and write()), but can also be used as sequences of lines in for-loops. ParseFileLineByLine objects also handle compression transparently. i.e. it is possible to read lines from a compressed text file as if it were not compressed. Compression is deduced from the file name suffixes '.Z' (compress/uncompress), '.gz' (gzip/gunzip), and '.bz2' (bzip2). The parse definition file name is developed based on the input file name. If the input file name is 'basename.ext', then the definition file is 'basename_def.ext'. If a definition file specific to the input file is not found, then the program searches for the file 'sparse.def' which would be the definition file for all files in that directory without a file specific definition file. Finally, ParseFileLineByLine objects accept file names that start with '~' or '~user' to indicate a home directory, as well as URLs (for reading only). Constructor: ParseFileLineByLine(|filename|, |mode|='"r"'), where |filename| is the name of the file (or a URL) and |mode| is one of '"r"' (read), '"w"' (write) or '"a"' (append, not supported for .Z files). """ def __init__(self, filename, mode = 'r'): """Opens input file, and if available the definition file. If the definition file is available __init__ will then create some pyparsing helper variables. """ if mode not in ['r', 'w', 'a']: raise IOError(0, 'Illegal mode: ' + repr(mode)) if string.find(filename, ':/') > 1: # URL if mode == 'w': raise IOError("can't write to a URL") import urllib.request, urllib.parse, urllib.error self.file = urllib.request.urlopen(filename) else: filename = os.path.expanduser(filename) if mode == 'r' or mode == 'a': if not os.path.exists(filename): raise IOError(2, 'No such file or directory: ' + filename) filen, file_extension = os.path.splitext(filename) command_dict = { ('.Z', 'r'): "self.file = os.popen('uncompress -c ' + filename, mode)", ('.gz', 'r'): "self.file = gzip.GzipFile(filename, 'rb')", ('.bz2', 'r'): "self.file = os.popen('bzip2 -dc ' + filename, mode)", ('.Z', 'w'): "self.file = os.popen('compress > ' + filename, mode)", ('.gz', 'w'): "self.file = gzip.GzipFile(filename, 'wb')", ('.bz2', 'w'): "self.file = os.popen('bzip2 > ' + filename, mode)", ('.Z', 'a'): "raise IOError, (0, 'Can\'t append to .Z files')", ('.gz', 'a'): "self.file = gzip.GzipFile(filename, 'ab')", ('.bz2', 'a'): "raise IOError, (0, 'Can\'t append to .bz2 files')", } exec(command_dict.get((file_extension, mode), 'self.file = open(filename, mode)')) self.grammar = None # Try to find a parse ('*_def.ext') definition file. First try to find # a file specific parse definition file, then look for 'sparse.def' # that would be the definition file for all files within the directory. # The definition file is pure Python. The one variable that needs to # be specified is 'parse'. The 'parse' variable is a list of tuples # defining the name, type, and because it is a list, the order of # variables on each line in the data file. The variable name is a # string, the type variable is defined as integer, real, and qString. # parse = [ # ('year', integer), # ('month', integer), # ('day', integer), # ('value', real), # ] definition_file_one = filen + "_def" + file_extension definition_file_two = os.path.dirname(filen) + os.sep + "sparse.def" if os.path.exists(definition_file_one): self.parsedef = definition_file_one elif os.path.exists(definition_file_two): self.parsedef = definition_file_two else: self.parsedef = None return None # Create some handy pyparsing constructs. I kept 'decimal_sep' so that # could easily change to parse if the decimal separator is a ",". decimal_sep = "." sign = oneOf("+ -") # part of printables without decimal_sep, +, - special_chars = string.replace('!"#$%&\'()*,./:;<=>?@[\\]^_`{|}~', decimal_sep, "") integer = ToInteger( Combine(Optional(sign) + Word(nums))).setName("integer") positive_integer = ToInteger( Combine(Optional("+") + Word(nums))).setName("integer") negative_integer = ToInteger( Combine("-" + Word(nums))).setName("integer") real = ToFloat( Combine(Optional(sign) + Word(nums) + decimal_sep + Optional(Word(nums)) + Optional(oneOf("E e") + Word(nums)))).setName("real") positive_real = ToFloat( Combine(Optional("+") + Word(nums) + decimal_sep + Optional(Word(nums)) + Optional(oneOf("E e") + Word(nums)))).setName("real") negative_real = ToFloat( Combine("-" + Word(nums) + decimal_sep + Optional(Word(nums)) + Optional(oneOf("E e") + Word(nums)))).setName("real") qString = ( sglQuotedString | dblQuotedString ).setName("qString") # add other characters we should skip over between interesting fields integer_junk = Optional( Suppress( Word(alphas + special_chars + decimal_sep))).setName("integer_junk") real_junk = Optional( Suppress( Word(alphas + special_chars))).setName("real_junk") qString_junk = SkipTo(qString).setName("qString_junk") # Now that 'integer', 'real', and 'qString' have been assigned I can # execute the definition file. exec(compile(open(self.parsedef).read(), self.parsedef, 'exec')) # Build the grammar, combination of the 'integer', 'real, 'qString', # and '*_junk' variables assigned above in the order specified in the # definition file. grammar = [] for nam, expr in parse: grammar.append( eval(expr.name + "_junk")) grammar.append( expr.setResultsName(nam) ) self.grammar = And( grammar[1:] + [restOfLine] ) def __del__(self): """Delete (close) the file wrapper.""" self.close() def __getitem__(self, item): """Used in 'for line in fp:' idiom.""" line = self.readline() if not line: raise IndexError return line def readline(self): """Reads (and optionally parses) a single line.""" line = self.file.readline() if self.grammar and line: try: return self.grammar.parseString(line).asDict() except ParseException: return self.readline() else: return line def readlines(self): """Returns a list of all lines (optionally parsed) in the file.""" if self.grammar: tot = [] # Used this way instead of a 'for' loop against # self.file.readlines() so that there wasn't two copies of the file # in memory. while 1: line = self.file.readline() if not line: break tot.append(line) return tot return self.file.readlines() def write(self, data): """Write to a file.""" self.file.write(data) def writelines(self, list): """Write a list to a file. Each item in the list is a line in the file. """ for line in list: self.file.write(line) def close(self): """Close the file.""" self.file.close() def flush(self): """Flush in memory contents to file.""" self.file.flush() #============================= def main(pargs): """This should only be used for testing. The primary mode of operation is as an imported library. """ input_file = sys.argv[1] fp = ParseFileLineByLine(input_file) for i in fp: print(i) #------------------------- if __name__ == '__main__': ftn = "main" opts, pargs = getopt.getopt(sys.argv[1:], 'hvd', ['help', 'version', 'debug', 'bb=']) for opt in opts: if opt[0] == '-h' or opt[0] == '--help': print(modname+": version="+__version__) usage() sys.exit(0) elif opt[0] == '-v' or opt[0] == '--version': print(modname+": version="+__version__) sys.exit(0) elif opt[0] == '-d' or opt[0] == '--debug': debug_p = 1 elif opt[0] == '--bb': opt_b = opt[1] #---make the object and run it--- main(pargs) #===Revision Log=== #Created by mkpythonproj: #2006-02-06 Tim Cera # pyparsing-2.1.10/examples/sql2dot.py0000666000000000000000000000573112466013312015525 0ustar 00000000000000#!/usr/bin/python # sql2dot.py # # Creates table graphics by parsing SQL table DML commands and # generating DOT language output. # # Adapted from a post at http://energyblog.blogspot.com/2006/04/blog-post_20.html. # sampleSQL = """ create table student ( student_id integer primary key, firstname varchar(20), lastname varchar(40), address1 varchar(80), address2 varchar(80), city varchar(30), state varchar(2), zipcode varchar(10), dob date ); create table classes ( class_id integer primary key, id varchar(8), maxsize integer, instructor varchar(40) ); create table student_registrations ( reg_id integer primary key, student_id integer, class_id integer ); alter table only student_registrations add constraint students_link foreign key (student_id) references students(student_id); alter table only student_registrations add constraint classes_link foreign key (class_id) references classes(class_id); """.upper() from pyparsing import Literal, CaselessLiteral, Word, delimitedList \ ,Optional, Combine, Group, alphas, nums, alphanums, Forward \ , oneOf, sglQuotedString, OneOrMore, ZeroOrMore, CharsNotIn \ , replaceWith skobki = "(" + ZeroOrMore(CharsNotIn(")")) + ")" field_def = OneOrMore(Word(alphas,alphanums+"_\"':-") | skobki) def field_act(s,loc,tok): return ("<"+tok[0]+"> " + " ".join(tok)).replace("\"","\\\"") field_def.setParseAction(field_act) field_list_def = delimitedList( field_def ) def field_list_act(toks): return " | ".join(toks) field_list_def.setParseAction(field_list_act) create_table_def = Literal("CREATE") + "TABLE" + Word(alphas,alphanums+"_").setResultsName("tablename") + \ "("+field_list_def.setResultsName("columns")+")"+ ";" def create_table_act(toks): return """"%(tablename)s" [\n\t label="<%(tablename)s> %(tablename)s | %(columns)s"\n\t shape="record"\n];""" % toks create_table_def.setParseAction(create_table_act) add_fkey_def=Literal("ALTER")+"TABLE"+"ONLY" + Word(alphanums+"_").setResultsName("fromtable") + "ADD" \ + "CONSTRAINT" + Word(alphanums+"_") + "FOREIGN"+"KEY"+"("+Word(alphanums+"_").setResultsName("fromcolumn")+")" \ +"REFERENCES"+Word(alphanums+"_").setResultsName("totable")+"("+Word(alphanums+"_").setResultsName("tocolumn")+")"+";" def add_fkey_act(toks): return """ "%(fromtable)s":%(fromcolumn)s -> "%(totable)s":%(tocolumn)s """ % toks add_fkey_def.setParseAction(add_fkey_act) other_statement_def = ( OneOrMore(CharsNotIn(";") ) + ";") other_statement_def.setParseAction( replaceWith("") ) comment_def = "--" + ZeroOrMore(CharsNotIn("\n")) comment_def.setParseAction( replaceWith("") ) statement_def = comment_def | create_table_def | add_fkey_def | other_statement_def defs = OneOrMore(statement_def) print("""digraph g { graph [ rankdir = "LR" ]; """) for i in defs.parseString(sampleSQL): if i!="": print(i) print("}")pyparsing-2.1.10/examples/stackish.py0000666000000000000000000000567012466013312015750 0ustar 00000000000000# stackish.py # # Stackish is a data representation syntax, similar to JSON or YAML. For more info on # stackish, see http://www.savingtheinternetwithhate.com/stackish.html # # Copyright 2008, Paul McGuire # """ NUMBER A simple integer type that's just any series of digits. FLOAT A simple floating point type. STRING A string is double quotes with anything inside that's not a " or newline character. You can include \n and \" to include these characters. MARK Marks a point in the stack that demarcates the boundary for a nested group. WORD Marks the root node of a group, with the other end being the nearest MARK. GROUP Acts as the root node of an anonymous group. ATTRIBUTE Assigns an attribute name to the previously processed node. This means that just about anything can be an attribute, unlike in XML. BLOB A BLOB is unique to Stackish and allows you to record any content (even binary content) inside the structure. This is done by pre- sizing the data with the NUMBER similar to Dan Bernstein's netstrings setup. SPACE White space is basically ignored. This is interesting because since Stackish is serialized consistently this means you can use \n as the separation character and perform reasonable diffs on two structures. """ from pyparsing import Suppress,Word,nums,alphas,alphanums,Combine,oneOf,\ Optional,QuotedString,Forward,Group,ZeroOrMore,printables,srange MARK,UNMARK,AT,COLON,QUOTE = map(Suppress,"[]@:'") NUMBER = Word(nums) NUMBER.setParseAction(lambda t:int(t[0])) FLOAT = Combine(oneOf("+ -") + Word(nums) + "." + Optional(Word(nums))) FLOAT.setParseAction(lambda t:float(t[0])) STRING = QuotedString('"', multiline=True) WORD = Word(alphas,alphanums+"_:") ATTRIBUTE = Combine(AT + WORD) strBody = Forward() def setBodyLength(tokens): strBody << Word(srange(r'[\0x00-\0xffff]'), exact=int(tokens[0])) return "" BLOB = Combine(QUOTE + Word(nums).setParseAction(setBodyLength) + COLON + strBody + QUOTE) item = Forward() def assignUsing(s): def assignPA(tokens): if s in tokens: tokens[tokens[s]] = tokens[0] del tokens[s] return assignPA GROUP = (MARK + Group( ZeroOrMore( (item + Optional(ATTRIBUTE)("attr") ).setParseAction(assignUsing("attr")) ) ) + ( WORD("name") | UNMARK ) ).setParseAction(assignUsing("name")) item << (NUMBER | FLOAT | STRING | BLOB | GROUP ) tests = """\ [ '10:1234567890' @name 25 @age +0.45 @percentage person:zed [ [ "hello" 1 child root [ "child" [ 200 '4:like' "I" "hello" things root [ [ "data" [ 2 1 ] @numbers child root [ [ 1 2 3 ] @test 4 5 6 root """.splitlines() for test in tests: if test: print(test) print(item.parseString(test).dump()) print() pyparsing-2.1.10/examples/stateMachine2.py0000666000000000000000000002117112466013312016620 0ustar 00000000000000# stateMachine.py # # module to define .pystate import handler # #import imputil import sys import os import types import urllib.parse DEBUG = False from pyparsing import Word, Group, ZeroOrMore, alphas, \ alphanums, ParserElement, ParseException, ParseSyntaxException, \ Empty, LineEnd, OneOrMore, col, Keyword, pythonStyleComment, \ StringEnd, traceParseAction ident = Word(alphas+"_", alphanums+"_$") pythonKeywords = """and as assert break class continue def del elif else except exec finally for from global if import in is lambda None not or pass print raise return try while with yield True False""" pythonKeywords = set(pythonKeywords.split()) def no_keywords_allowed(s,l,t): wd = t[0] if wd in pythonKeywords: errmsg = "cannot not use keyword '%s' " \ "as an identifier" % wd raise ParseException(s,l,errmsg) ident.setParseAction(no_keywords_allowed) stateTransition = ident("fromState") + "->" + ident("toState") stateMachine = Keyword("statemachine") + \ ident("name") + ":" + \ OneOrMore(Group(stateTransition))("transitions") namedStateTransition = (ident("fromState") + \ "-(" + ident("transition") + ")->" + \ ident("toState")) namedStateMachine = Keyword("statemachine") + \ ident("name") + ":" + \ OneOrMore(Group(namedStateTransition))("transitions") def expand_state_definition(source, loc, tokens): indent = " " * (col(loc,source)-1) statedef = [] # build list of states states = set() fromTo = {} for tn in tokens.transitions: states.add(tn.fromState) states.add(tn.toState) fromTo[tn.fromState] = tn.toState # define base class for state classes baseStateClass = tokens.name + "State" statedef.extend([ "class %s(object):" % baseStateClass, " def __str__(self):", " return self.__class__.__name__", " def next_state(self):", " return self._next_state_class()" ]) # define all state classes statedef.extend( "class %s(%s): pass" % (s,baseStateClass) for s in states ) statedef.extend( "%s._next_state_class = %s" % (s,fromTo[s]) for s in states if s in fromTo ) return indent + ("\n"+indent).join(statedef)+"\n" stateMachine.setParseAction(expand_state_definition) def expand_named_state_definition(source,loc,tokens): indent = " " * (col(loc,source)-1) statedef = [] # build list of states and transitions states = set() transitions = set() baseStateClass = tokens.name + "State" fromTo = {} for tn in tokens.transitions: states.add(tn.fromState) states.add(tn.toState) transitions.add(tn.transition) if tn.fromState in fromTo: fromTo[tn.fromState][tn.transition] = tn.toState else: fromTo[tn.fromState] = {tn.transition:tn.toState} # add entries for terminal states for s in states: if s not in fromTo: fromTo[s] = {} # define state transition class statedef.extend([ "class %sTransition:" % baseStateClass, " def __str__(self):", " return self.transitionName", ]) statedef.extend( "%s = %sTransition()" % (tn,baseStateClass) for tn in transitions) statedef.extend("%s.transitionName = '%s'" % (tn,tn) for tn in transitions) # define base class for state classes excmsg = "'" + tokens.name + \ '.%s does not support transition "%s"' \ "'% (self, tn)" statedef.extend([ "class %s(object):" % baseStateClass, " def __str__(self):", " return self.__class__.__name__", " def next_state(self,tn):", " try:", " return self.tnmap[tn]()", " except KeyError:", " raise Exception(%s)" % excmsg, " def __getattr__(self,name):", " raise Exception(%s)" % excmsg, ]) # define all state classes for s in states: statedef.append("class %s(%s): pass" % (s,baseStateClass)) # define state transition maps and transition methods for s in states: trns = list(fromTo[s].items()) statedef.append("%s.tnmap = {%s}" % (s, ",".join("%s:%s" % tn for tn in trns)) ) statedef.extend([ "%s.%s = staticmethod(lambda : %s())" % (s,tn_,to_) for tn_,to_ in trns ]) return indent + ("\n"+indent).join(statedef) + "\n" namedStateMachine.setParseAction( expand_named_state_definition) #====================================================================== # NEW STUFF - Matt Anderson, 2009-11-26 #====================================================================== class SuffixImporter(object): """An importer designed using the mechanism defined in :pep:`302`. I read the PEP, and also used Doug Hellmann's PyMOTW article `Modules and Imports`_, as a pattern. .. _`Modules and Imports`: http://www.doughellmann.com/PyMOTW/sys/imports.html Define a subclass that specifies a :attr:`suffix` attribute, and implements a :meth:`process_filedata` method. Then call the classmethod :meth:`register` on your class to actually install it in the appropriate places in :mod:`sys`. """ scheme = 'suffix' suffix = None path_entry = None @classmethod def trigger_url(cls): if cls.suffix is None: raise ValueError('%s.suffix is not set' % cls.__name__) return 'suffix:%s' % cls.suffix @classmethod def register(cls): sys.path_hooks.append(cls) sys.path.append(cls.trigger_url()) def __init__(self, path_entry): pr = urllib.parse.urlparse(str(path_entry)) if pr.scheme != self.scheme or pr.path != self.suffix: raise ImportError() self.path_entry = path_entry self._found = {} def checkpath_iter(self, fullname): for dirpath in sys.path: # if the value in sys.path_importer_cache is None, then this # path *should* be imported by the builtin mechanism, and the # entry is thus a path to a directory on the filesystem; # if it's not None, then some other importer is in charge, and # it probably isn't even a filesystem path if sys.path_importer_cache.get(dirpath,False) is None: checkpath = os.path.join( dirpath,'%s.%s' % (fullname,self.suffix)) yield checkpath def find_module(self, fullname, path=None): for checkpath in self.checkpath_iter(fullname): if os.path.isfile(checkpath): self._found[fullname] = checkpath return self return None def load_module(self, fullname): assert fullname in self._found if fullname in sys.modules: module = sys.modules[fullname] else: sys.modules[fullname] = module = types.ModuleType(fullname) data = None f = open(self._found[fullname]) try: data = f.read() finally: f.close() module.__dict__.clear() module.__file__ = self._found[fullname] module.__name__ = fullname module.__loader__ = self self.process_filedata(module, data) return module def process_filedata(self, module, data): pass class PystateImporter(SuffixImporter): suffix = 'pystate' def process_filedata(self, module, data): # MATT-NOTE: re-worked :func:`get_state_machine` # convert any statemachine expressions stateMachineExpr = (stateMachine | namedStateMachine).ignore( pythonStyleComment) generated_code = stateMachineExpr.transformString(data) if DEBUG: print(generated_code) # compile code object from generated code # (strip trailing spaces and tabs, compile doesn't like # dangling whitespace) COMPILE_MODE = 'exec' codeobj = compile(generated_code.rstrip(" \t"), module.__file__, COMPILE_MODE) exec(codeobj, module.__dict__) PystateImporter.register() pyparsing-2.1.10/examples/TAP.py0000666000000000000000000001645312466013312014564 0ustar 00000000000000# # TAP.py - TAP parser # # A pyparsing parser to process the output of the Perl # "Test Anything Protocol" # (http://search.cpan.org/~petdance/TAP-1.00/TAP.pm) # # TAP output lines are preceded or followed by a test number range: # 1..n # with 'n' TAP output lines. # # The general format of a TAP output line is: # ok/not ok (required) # Test number (recommended) # Description (recommended) # Directive (only when necessary) # # A TAP output line may also indicate abort of the test suit with the line: # Bail out! # optionally followed by a reason for bailing # # Copyright 2008, by Paul McGuire # from pyparsing import ParserElement,LineEnd,Optional,Word,nums,Regex,\ Literal,CaselessLiteral,Group,OneOrMore,Suppress,restOfLine,\ FollowedBy,empty __all__ = ['tapOutputParser', 'TAPTest', 'TAPSummary'] # newlines are significant whitespace, so set default skippable # whitespace to just spaces and tabs ParserElement.setDefaultWhitespaceChars(" \t") NL = LineEnd().suppress() integer = Word(nums) plan = '1..' + integer("ubound") OK,NOT_OK = map(Literal,['ok','not ok']) testStatus = (OK | NOT_OK) description = Regex("[^#\n]+") description.setParseAction(lambda t:t[0].lstrip('- ')) TODO,SKIP = map(CaselessLiteral,'TODO SKIP'.split()) directive = Group(Suppress('#') + (TODO + restOfLine | FollowedBy(SKIP) + restOfLine.copy().setParseAction(lambda t:['SKIP',t[0]]) )) commentLine = Suppress("#") + empty + restOfLine testLine = Group( Optional(OneOrMore(commentLine + NL))("comments") + testStatus("passed") + Optional(integer)("testNumber") + Optional(description)("description") + Optional(directive)("directive") ) bailLine = Group(Literal("Bail out!")("BAIL") + empty + Optional(restOfLine)("reason")) tapOutputParser = Optional(Group(plan)("plan") + NL) & \ Group(OneOrMore((testLine|bailLine) + NL))("tests") class TAPTest(object): def __init__(self,results): self.num = results.testNumber self.passed = (results.passed=="ok") self.skipped = self.todo = False if results.directive: self.skipped = (results.directive[0][0]=='SKIP') self.todo = (results.directive[0][0]=='TODO') @classmethod def bailedTest(cls,num): ret = TAPTest(empty.parseString("")) ret.num = num ret.skipped = True return ret class TAPSummary(object): def __init__(self,results): self.passedTests = [] self.failedTests = [] self.skippedTests = [] self.todoTests = [] self.bonusTests = [] self.bail = False if results.plan: expected = list(range(1, int(results.plan.ubound)+1)) else: expected = list(range(1,len(results.tests)+1)) for i,res in enumerate(results.tests): # test for bail out if res.BAIL: #~ print "Test suite aborted: " + res.reason #~ self.failedTests += expected[i:] self.bail = True self.skippedTests += [ TAPTest.bailedTest(ii) for ii in expected[i:] ] self.bailReason = res.reason break #~ print res.dump() testnum = i+1 if res.testNumber != "": if testnum != int(res.testNumber): print("ERROR! test %(testNumber)s out of sequence" % res) testnum = int(res.testNumber) res["testNumber"] = testnum test = TAPTest(res) if test.passed: self.passedTests.append(test) else: self.failedTests.append(test) if test.skipped: self.skippedTests.append(test) if test.todo: self.todoTests.append(test) if test.todo and test.passed: self.bonusTests.append(test) self.passedSuite = not self.bail and (set(self.failedTests)-set(self.todoTests) == set()) def summary(self, showPassed=False, showAll=False): testListStr = lambda tl : "[" + ",".join(str(t.num) for t in tl) + "]" summaryText = [] if showPassed or showAll: summaryText.append( "PASSED: %s" % testListStr(self.passedTests) ) if self.failedTests or showAll: summaryText.append( "FAILED: %s" % testListStr(self.failedTests) ) if self.skippedTests or showAll: summaryText.append( "SKIPPED: %s" % testListStr(self.skippedTests) ) if self.todoTests or showAll: summaryText.append( "TODO: %s" % testListStr(self.todoTests) ) if self.bonusTests or showAll: summaryText.append( "BONUS: %s" % testListStr(self.bonusTests) ) if self.passedSuite: summaryText.append( "PASSED" ) else: summaryText.append( "FAILED" ) return "\n".join(summaryText) # create TAPSummary objects from tapOutput parsed results, by setting # class as parse action tapOutputParser.setParseAction(TAPSummary) if __name__ == "__main__": test1 = """\ 1..4 ok 1 - Input file opened not ok 2 - First line of the input valid ok 3 - Read the rest of the file not ok 4 - Summarized correctly # TODO Not written yet """ test2 = """\ ok 1 not ok 2 some description # TODO with a directive ok 3 a description only, no directive ok 4 # TODO directive only ok a description only, no directive ok # Skipped only a directive, no description ok """ test3 = """\ ok - created Board ok ok not ok ok ok ok ok # +------+------+------+------+ # | |16G | |05C | # | |G N C | |C C G | # | | G | | C +| # +------+------+------+------+ # |10C |01G | |03C | # |R N G |G A G | |C C C | # | R | G | | C +| # +------+------+------+------+ # | |01G |17C |00C | # | |G A G |G N R |R N R | # | | G | R | G | # +------+------+------+------+ ok - board has 7 tiles + starter tile 1..9 """ test4 = """\ 1..4 ok 1 - Creating test program ok 2 - Test program runs, no error not ok 3 - infinite loop # TODO halting problem unsolved not ok 4 - infinite loop 2 # TODO halting problem unsolved """ test5 = """\ 1..20 ok - database handle not ok - failed database login Bail out! Couldn't connect to database. """ test6 = """\ ok 1 - retrieving servers from the database # need to ping 6 servers ok 2 - pinged diamond ok 3 - pinged ruby not ok 4 - pinged sapphire ok 5 - pinged onyx not ok 6 - pinged quartz ok 7 - pinged gold 1..7 """ for test in (test1,test2,test3,test4,test5,test6): print(test) tapResult = tapOutputParser.parseString(test)[0] print(tapResult.summary(showAll=True)) print() pyparsing-2.1.10/examples/test_bibparse.py0000666000000000000000000001727312466013312016767 0ustar 00000000000000""" Test for bibparse grammar """ from os.path import join as pjoin, dirname from pyparsing import ParseException from btpyparse import Macro import btpyparse as bp from nose.tools import assert_true, assert_false, assert_equal, assert_raises def test_names(): # check various types of names # All names can contains alphas, but not some special chars bad_chars = '"#%\'(),={}' for name_type, dig1f in ((bp.macro_def, False), (bp.field_name, False), (bp.entry_type, False), (bp.cite_key, True)): if dig1f: # can start with digit assert_equal(name_type.parseString('2t')[0], '2t') else: assert_raises(ParseException, name_type.parseString, '2t') # All of the names cannot contain some characters for char in bad_chars: assert_raises(ParseException, name_type.parseString, char) # standard strings all OK assert_equal(name_type.parseString('simple_test')[0], 'simple_test') # Test macro ref mr = bp.macro_ref # can't start with digit assert_raises(ParseException, mr.parseString, '2t') for char in bad_chars: assert_raises(ParseException, mr.parseString, char) assert_equal(mr.parseString('simple_test')[0].name, 'simple_test') def test_numbers(): assert_equal(bp.number.parseString('1066')[0], '1066') assert_equal(bp.number.parseString('0')[0], '0') assert_raises(ParseException, bp.number.parseString, '-4') assert_raises(ParseException, bp.number.parseString, '+4') assert_raises(ParseException, bp.number.parseString, '.4') # something point something leaves a trailing .4 unmatched assert_equal(bp.number.parseString('0.4')[0], '0') def test_parse_string(): # test string building blocks assert_equal(bp.chars_no_quotecurly.parseString('x')[0], 'x') assert_equal(bp.chars_no_quotecurly.parseString("a string")[0], 'a string') assert_equal(bp.chars_no_quotecurly.parseString('a "string')[0], 'a ') assert_equal(bp.chars_no_curly.parseString('x')[0], 'x') assert_equal(bp.chars_no_curly.parseString("a string")[0], 'a string') assert_equal(bp.chars_no_curly.parseString('a {string')[0], 'a ') assert_equal(bp.chars_no_curly.parseString('a }string')[0], 'a ') # test more general strings together for obj in (bp.curly_string, bp.string, bp.field_value): assert_equal(obj.parseString('{}').asList(), []) assert_equal(obj.parseString('{a "string}')[0], 'a "string') assert_equal(obj.parseString('{a {nested} string}').asList(), ['a ', ['nested'], ' string']) assert_equal(obj.parseString('{a {double {nested}} string}').asList(), ['a ', ['double ', ['nested']], ' string']) for obj in (bp.quoted_string, bp.string, bp.field_value): assert_equal(obj.parseString('""').asList(), []) assert_equal(obj.parseString('"a string"')[0], 'a string') assert_equal(obj.parseString('"a {nested} string"').asList(), ['a ', ['nested'], ' string']) assert_equal(obj.parseString('"a {double {nested}} string"').asList(), ['a ', ['double ', ['nested']], ' string']) # check macro def in string assert_equal(bp.string.parseString('someascii')[0], Macro('someascii')) assert_raises(ParseException, bp.string.parseString, '%#= validstring') # check number in string assert_equal(bp.string.parseString('1994')[0], '1994') def test_parse_field(): # test field value - hashes included fv = bp.field_value # Macro assert_equal(fv.parseString('aname')[0], Macro('aname')) assert_equal(fv.parseString('ANAME')[0], Macro('aname')) # String and macro assert_equal(fv.parseString('aname # "some string"').asList(), [Macro('aname'), 'some string']) # Nested string assert_equal(fv.parseString('aname # {some {string}}').asList(), [Macro('aname'), 'some ', ['string']]) # String and number assert_equal(fv.parseString('"a string" # 1994').asList(), ['a string', '1994']) # String and number and macro assert_equal(fv.parseString('"a string" # 1994 # a_macro').asList(), ['a string', '1994', Macro('a_macro')]) def test_comments(): res = bp.comment.parseString('@Comment{about something}') assert_equal(res.asList(), ['comment', '{about something}']) assert_equal( bp.comment.parseString('@COMMENT{about something').asList(), ['comment', '{about something']) assert_equal( bp.comment.parseString('@comment(about something').asList(), ['comment', '(about something']) assert_equal( bp.comment.parseString('@COMment about something').asList(), ['comment', ' about something']) assert_raises(ParseException, bp.comment.parseString, '@commentabout something') assert_raises(ParseException, bp.comment.parseString, '@comment+about something') assert_raises(ParseException, bp.comment.parseString, '@comment"about something') def test_preamble(): res = bp.preamble.parseString('@preamble{"about something"}') assert_equal(res.asList(), ['preamble', 'about something']) assert_equal(bp.preamble.parseString( '@PREamble{{about something}}').asList(), ['preamble', 'about something']) assert_equal(bp.preamble.parseString("""@PREamble{ {about something} }""").asList(), ['preamble', 'about something']) def test_macro(): res = bp.macro.parseString('@string{ANAME = "about something"}') assert_equal(res.asList(), ['string', 'aname', 'about something']) assert_equal( bp.macro.parseString('@string{aname = {about something}}').asList(), ['string', 'aname', 'about something']) def test_entry(): txt = """@some_entry{akey, aname = "about something", another={something else}}""" res = bp.entry.parseString(txt) assert_equal(res.asList(), ['some_entry', 'akey', ['aname', 'about something'], ['another', 'something else']]) # Case conversion txt = """@SOME_ENTRY{akey, ANAME = "about something", another={something else}}""" res = bp.entry.parseString(txt) assert_equal(res.asList(), ['some_entry', 'akey', ['aname', 'about something'], ['another', 'something else']]) def test_bibfile(): txt = """@some_entry{akey, aname = "about something", another={something else}}""" res = bp.bibfile.parseString(txt) assert_equal(res.asList(), [['some_entry', 'akey', ['aname', 'about something'], ['another', 'something else']]]) def test_bib1(): # First pass whole bib-like tests txt = """ Some introductory text (implicit comment) @ARTICLE{Brett2002marsbar, author = {Matthew Brett and Jean-Luc Anton and Romain Valabregue and Jean-Baptise Poline}, title = {{Region of interest analysis using an SPM toolbox}}, journal = {Neuroimage}, year = {2002}, volume = {16}, pages = {1140--1141}, number = {2} } @some_entry{akey, aname = "about something", another={something else}} """ res = bp.bibfile.parseString(txt) assert_equal(len(res), 3) res2 = bp.parse_str(txt) assert_equal(res.asList(), res2.asList()) res3 = [r.asList()[0] for r, start, end in bp.definitions.scanString(txt)] assert_equal(res.asList(), res3) if __name__ == '__main__': import nose nose.main() pyparsing-2.1.10/examples/urlExtractor.py0000666000000000000000000000221012751645511016631 0ustar 00000000000000# URL extractor # Copyright 2004, Paul McGuire from pyparsing import makeHTMLTags, SkipTo, pyparsing_common import urllib.request from contextlib import closing import pprint linkOpenTag, linkCloseTag = makeHTMLTags('a') linkBody = SkipTo(linkCloseTag) linkBody.setParseAction(pyparsing_common.stripHTMLTags) linkBody.addParseAction(lambda toks: ' '.join(toks[0].strip().split())) link = linkOpenTag + linkBody("body") + linkCloseTag.suppress() # Go get some HTML with some links in it. with closing(urllib.request.urlopen("http://www.yahoo.com")) as serverListPage: htmlText = serverListPage.read().decode("UTF-8") # scanString is a generator that loops through the input htmlText, and for each # match yields the tokens and start and end locations (for this application, we are # not interested in the start and end values). for toks,strt,end in link.scanString(htmlText): print(toks.asList()) # Create dictionary from list comprehension, assembled from each pair of tokens returned # from a matched URL. pprint.pprint( dict((toks.body, toks.href) for toks,strt,end in link.scanString(htmlText)) ) pyparsing-2.1.10/examples/urlExtractorNew.py0000666000000000000000000000266412716265174017324 0ustar 00000000000000# URL extractor # Copyright 2004, Paul McGuire from pyparsing import Literal,Suppress,CharsNotIn,CaselessLiteral,\ Word,dblQuotedString,alphanums,SkipTo,makeHTMLTags import urllib.request, urllib.parse, urllib.error import pprint # Define the pyparsing grammar for a URL, that is: # URLlink ::= linkText # URL ::= doubleQuotedString | alphanumericWordPath # Note that whitespace may appear just about anywhere in the link. Note also # that it is not necessary to explicitly show this in the pyparsing grammar; by default, # pyparsing skips over whitespace between tokens. linkOpenTag,linkCloseTag = makeHTMLTags("a") link = linkOpenTag + SkipTo(linkCloseTag)("body") + linkCloseTag.suppress() # Go get some HTML with some links in it. serverListPage = urllib.request.urlopen( "http://www.google.com" ) htmlText = serverListPage.read() serverListPage.close() # scanString is a generator that loops through the input htmlText, and for each # match yields the tokens and start and end locations (for this application, we are # not interested in the start and end values). for toks,strt,end in link.scanString(htmlText): print(toks.startA.href,"->",toks.body) # Create dictionary from list comprehension, assembled from each pair of tokens returned # from a matched URL. pprint.pprint( dict( [ (toks.body,toks.startA.href) for toks,strt,end in link.scanString(htmlText) ] ) ) pyparsing-2.1.10/examples/verilogParse.py0000666000000000000000000007613712655553513016623 0ustar 00000000000000# # verilogParse.py # # an example of using the pyparsing module to be able to process Verilog files # uses BNF defined at http://www.verilog.com/VerilogBNF.html # # Copyright (c) 2004-2011 Paul T. McGuire. All rights reserved. # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, # distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to # the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # If you find this software to be useful, please make a donation to one # of the following charities: # - the Red Cross (http://www.redcross.org) # - Hospice Austin (http://www.hospiceaustin.org) # # DISCLAIMER: # THIS SOFTWARE IS PROVIDED BY PAUL T. McGUIRE ``AS IS'' AND ANY EXPRESS OR # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO # EVENT SHALL PAUL T. McGUIRE OR CO-CONTRIBUTORS BE LIABLE FOR ANY DIRECT, # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OFUSE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY # OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # # For questions or inquiries regarding this license, or commercial use of # this software, contact the author via e-mail: ptmcg@users.sourceforge.net # # Todo: # - add pre-process pass to implement compilerDirectives (ifdef, include, etc.) # # Revision History: # # 1.0 - Initial release # 1.0.1 - Fixed grammar errors: # . real declaration was incorrect # . tolerant of '=>' for '*>' operator # . tolerant of '?' as hex character # . proper handling of mintypmax_expr within path delays # 1.0.2 - Performance tuning (requires pyparsing 1.3) # 1.0.3 - Performance updates, using Regex (requires pyparsing 1.4) # 1.0.4 - Performance updates, enable packrat parsing (requires pyparsing 1.4.2) # 1.0.5 - Converted keyword Literals to Keywords, added more use of Group to # group parsed results tokens # 1.0.6 - Added support for module header with no ports list (thanks, Thomas Dejanovic!) # 1.0.7 - Fixed erroneous '<<' Forward definition in timCheckCond, omitting ()'s # 1.0.8 - Re-released under MIT license # 1.0.9 - Enhanced udpInstance to handle identifiers with leading '\' and subscripting # 1.0.10 - Fixed change added in 1.0.9 to work for all identifiers, not just those used # for udpInstance. # 1.0.11 - Fixed bug in inst_args, content alternatives were reversed # import pdb import time import pprint import sys __version__ = "1.0.11" from pyparsing import Literal, CaselessLiteral, Keyword, Word, OneOrMore, ZeroOrMore, \ Forward, NotAny, delimitedList, Group, Optional, Combine, alphas, nums, restOfLine, cStyleComment, \ alphanums, printables, dblQuotedString, empty, ParseException, ParseResults, MatchFirst, oneOf, GoToColumn, \ ParseResults,StringEnd, FollowedBy, ParserElement, And, Regex, cppStyleComment#,__version__ import pyparsing usePackrat = False usePsyco = False packratOn = False psycoOn = False if usePackrat: try: ParserElement.enablePackrat() except: pass else: packratOn = True # comment out this section to disable psyco function compilation if usePsyco: try: import psyco psyco.full() except: print("failed to import psyco Python optimizer") else: psycoOn = True def dumpTokens(s,l,t): import pprint pprint.pprint( t.asList() ) verilogbnf = None def Verilog_BNF(): global verilogbnf if verilogbnf is None: # compiler directives compilerDirective = Combine( "`" + \ oneOf("define undef ifdef else endif default_nettype " "include resetall timescale unconnected_drive " "nounconnected_drive celldefine endcelldefine") + \ restOfLine ).setName("compilerDirective") # primitives SEMI,COLON,LPAR,RPAR,LBRACE,RBRACE,LBRACK,RBRACK,DOT,COMMA,EQ = map(Literal,";:(){}[].,=") identLead = alphas+"$_" identBody = alphanums+"$_" identifier1 = Regex( r"\.?["+identLead+"]["+identBody+"]*(\.["+identLead+"]["+identBody+"]*)*" ).setName("baseIdent") identifier2 = Regex(r"\\\S+").setParseAction(lambda t:t[0][1:]).setName("escapedIdent")#.setDebug() identifier = identifier1 | identifier2 assert(identifier2 == r'\abc') hexnums = nums + "abcdefABCDEF" + "_?" base = Regex("'[bBoOdDhH]").setName("base") basedNumber = Combine( Optional( Word(nums + "_") ) + base + Word(hexnums+"xXzZ"), joinString=" ", adjacent=False ).setName("basedNumber") #~ number = ( basedNumber | Combine( Word( "+-"+spacedNums, spacedNums ) + #~ Optional( DOT + Optional( Word( spacedNums ) ) ) + #~ Optional( e + Word( "+-"+spacedNums, spacedNums ) ) ).setName("numeric") ) number = ( basedNumber | \ Regex(r"[+-]?[0-9_]+(\.[0-9_]*)?([Ee][+-]?[0-9_]+)?") \ ).setName("numeric") #~ decnums = nums + "_" #~ octnums = "01234567" + "_" expr = Forward().setName("expr") concat = Group( LBRACE + delimitedList( expr ) + RBRACE ) multiConcat = Group("{" + expr + concat + "}").setName("multiConcat") funcCall = Group(identifier + LPAR + Optional( delimitedList( expr ) ) + RPAR).setName("funcCall") subscrRef = Group(LBRACK + delimitedList( expr, COLON ) + RBRACK) subscrIdentifier = Group( identifier + Optional( subscrRef ) ) #~ scalarConst = "0" | (( FollowedBy('1') + oneOf("1'b0 1'b1 1'bx 1'bX 1'B0 1'B1 1'Bx 1'BX 1") )) scalarConst = Regex("0|1('[Bb][01xX])?") mintypmaxExpr = Group( expr + COLON + expr + COLON + expr ).setName("mintypmax") primary = ( number | (LPAR + mintypmaxExpr + RPAR ) | ( LPAR + Group(expr) + RPAR ).setName("nestedExpr") | multiConcat | concat | dblQuotedString | funcCall | subscrIdentifier ) unop = oneOf( "+ - ! ~ & ~& | ^| ^ ~^" ).setName("unop") binop = oneOf( "+ - * / % == != === !== && " "|| < <= > >= & | ^ ^~ >> << ** <<< >>>" ).setName("binop") expr << ( ( unop + expr ) | # must be first! ( primary + "?" + expr + COLON + expr ) | ( primary + Optional( binop + expr ) ) ) lvalue = subscrIdentifier | concat # keywords if_ = Keyword("if") else_ = Keyword("else") edge = Keyword("edge") posedge = Keyword("posedge") negedge = Keyword("negedge") specify = Keyword("specify") endspecify = Keyword("endspecify") fork = Keyword("fork") join = Keyword("join") begin = Keyword("begin") end = Keyword("end") default = Keyword("default") forever = Keyword("forever") repeat = Keyword("repeat") while_ = Keyword("while") for_ = Keyword("for") case = oneOf( "case casez casex" ) endcase = Keyword("endcase") wait = Keyword("wait") disable = Keyword("disable") deassign = Keyword("deassign") force = Keyword("force") release = Keyword("release") assign = Keyword("assign") eventExpr = Forward() eventTerm = ( posedge + expr ) | ( negedge + expr ) | expr | ( LPAR + eventExpr + RPAR ) eventExpr << ( Group( delimitedList( eventTerm, Keyword("or") ) ) ) eventControl = Group( "@" + ( ( LPAR + eventExpr + RPAR ) | identifier | "*" ) ).setName("eventCtrl") delayArg = ( number | Word(alphanums+"$_") | #identifier | ( LPAR + Group( delimitedList( mintypmaxExpr | expr ) ) + RPAR ) ).setName("delayArg")#.setDebug() delay = Group( "#" + delayArg ).setName("delay")#.setDebug() delayOrEventControl = delay | eventControl assgnmt = Group( lvalue + EQ + Optional( delayOrEventControl ) + expr ).setName( "assgnmt" ) nbAssgnmt = Group(( lvalue + "<=" + Optional( delay ) + expr ) | ( lvalue + "<=" + Optional( eventControl ) + expr )).setName( "nbassgnmt" ) range = LBRACK + expr + COLON + expr + RBRACK paramAssgnmt = Group( identifier + EQ + expr ).setName("paramAssgnmt") parameterDecl = Group( "parameter" + Optional( range ) + delimitedList( paramAssgnmt ) + SEMI).setName("paramDecl") inputDecl = Group( "input" + Optional( range ) + delimitedList( identifier ) + SEMI ) outputDecl = Group( "output" + Optional( range ) + delimitedList( identifier ) + SEMI ) inoutDecl = Group( "inout" + Optional( range ) + delimitedList( identifier ) + SEMI ) regIdentifier = Group( identifier + Optional( LBRACK + expr + COLON + expr + RBRACK ) ) regDecl = Group( "reg" + Optional("signed") + Optional( range ) + delimitedList( regIdentifier ) + SEMI ).setName("regDecl") timeDecl = Group( "time" + delimitedList( regIdentifier ) + SEMI ) integerDecl = Group( "integer" + delimitedList( regIdentifier ) + SEMI ) strength0 = oneOf("supply0 strong0 pull0 weak0 highz0") strength1 = oneOf("supply1 strong1 pull1 weak1 highz1") driveStrength = Group( LPAR + ( ( strength0 + COMMA + strength1 ) | ( strength1 + COMMA + strength0 ) ) + RPAR ).setName("driveStrength") nettype = oneOf("wire tri tri1 supply0 wand triand tri0 supply1 wor trior trireg") expandRange = Optional( oneOf("scalared vectored") ) + range realDecl = Group( "real" + delimitedList( identifier ) + SEMI ) eventDecl = Group( "event" + delimitedList( identifier ) + SEMI ) blockDecl = ( parameterDecl | regDecl | integerDecl | realDecl | timeDecl | eventDecl ) stmt = Forward().setName("stmt")#.setDebug() stmtOrNull = stmt | SEMI caseItem = ( delimitedList( expr ) + COLON + stmtOrNull ) | \ ( default + Optional(":") + stmtOrNull ) stmt << Group( ( begin + Group( ZeroOrMore( stmt ) ) + end ).setName("begin-end") | ( if_ + Group(LPAR + expr + RPAR) + stmtOrNull + Optional( else_ + stmtOrNull ) ).setName("if") | ( delayOrEventControl + stmtOrNull ) | ( case + LPAR + expr + RPAR + OneOrMore( caseItem ) + endcase ) | ( forever + stmt ) | ( repeat + LPAR + expr + RPAR + stmt ) | ( while_ + LPAR + expr + RPAR + stmt ) | ( for_ + LPAR + assgnmt + SEMI + Group( expr ) + SEMI + assgnmt + RPAR + stmt ) | ( fork + ZeroOrMore( stmt ) + join ) | ( fork + COLON + identifier + ZeroOrMore( blockDecl ) + ZeroOrMore( stmt ) + end ) | ( wait + LPAR + expr + RPAR + stmtOrNull ) | ( "->" + identifier + SEMI ) | ( disable + identifier + SEMI ) | ( assign + assgnmt + SEMI ) | ( deassign + lvalue + SEMI ) | ( force + assgnmt + SEMI ) | ( release + lvalue + SEMI ) | ( begin + COLON + identifier + ZeroOrMore( blockDecl ) + ZeroOrMore( stmt ) + end ).setName("begin:label-end") | # these *have* to go at the end of the list!!! ( assgnmt + SEMI ) | ( nbAssgnmt + SEMI ) | ( Combine( Optional("$") + identifier ) + Optional( LPAR + delimitedList(expr|empty) + RPAR ) + SEMI ) ).setName("stmtBody") """ x::= ; x||= ; x||= if ( ) x||= if ( ) else x||= case ( ) + endcase x||= casez ( ) + endcase x||= casex ( ) + endcase x||= forever x||= repeat ( ) x||= while ( ) x||= for ( ; ; ) x||= x||= wait ( ) x||= -> ; x||= x||= x||= x||= x||= disable ; x||= disable ; x||= assign ; x||= deassign ; x||= force ; x||= release ; """ alwaysStmt = Group( "always" + Optional(eventControl) + stmt ).setName("alwaysStmt") initialStmt = Group( "initial" + stmt ).setName("initialStmt") chargeStrength = Group( LPAR + oneOf( "small medium large" ) + RPAR ).setName("chargeStrength") continuousAssign = Group( assign + Optional( driveStrength ) + Optional( delay ) + delimitedList( assgnmt ) + SEMI ).setName("continuousAssign") tfDecl = ( parameterDecl | inputDecl | outputDecl | inoutDecl | regDecl | timeDecl | integerDecl | realDecl ) functionDecl = Group( "function" + Optional( range | "integer" | "real" ) + identifier + SEMI + Group( OneOrMore( tfDecl ) ) + Group( ZeroOrMore( stmt ) ) + "endfunction" ) inputOutput = oneOf("input output") netDecl1Arg = ( nettype + Optional( expandRange ) + Optional( delay ) + Group( delimitedList( ~inputOutput + identifier ) ) ) netDecl2Arg = ( "trireg" + Optional( chargeStrength ) + Optional( expandRange ) + Optional( delay ) + Group( delimitedList( ~inputOutput + identifier ) ) ) netDecl3Arg = ( nettype + Optional( driveStrength ) + Optional( expandRange ) + Optional( delay ) + Group( delimitedList( assgnmt ) ) ) netDecl1 = Group(netDecl1Arg + SEMI).setName("netDecl1") netDecl2 = Group(netDecl2Arg + SEMI).setName("netDecl2") netDecl3 = Group(netDecl3Arg + SEMI).setName("netDecl3") gateType = oneOf("and nand or nor xor xnor buf bufif0 bufif1 " "not notif0 notif1 pulldown pullup nmos rnmos " "pmos rpmos cmos rcmos tran rtran tranif0 " "rtranif0 tranif1 rtranif1" ) gateInstance = Optional( Group( identifier + Optional( range ) ) ) + \ LPAR + Group( delimitedList( expr ) ) + RPAR gateDecl = Group( gateType + Optional( driveStrength ) + Optional( delay ) + delimitedList( gateInstance) + SEMI ) udpInstance = Group( Group( identifier + Optional(range | subscrRef) ) + LPAR + Group( delimitedList( expr ) ) + RPAR ) udpInstantiation = Group( identifier - Optional( driveStrength ) + Optional( delay ) + delimitedList( udpInstance ) + SEMI ).setName("udpInstantiation") parameterValueAssignment = Group( Literal("#") + LPAR + Group( delimitedList( expr ) ) + RPAR ) namedPortConnection = Group( DOT + identifier + LPAR + expr + RPAR ).setName("namedPortConnection")#.setDebug() assert(r'.\abc (abc )' == namedPortConnection) modulePortConnection = expr | empty #~ moduleInstance = Group( Group ( identifier + Optional(range) ) + #~ ( delimitedList( modulePortConnection ) | #~ delimitedList( namedPortConnection ) ) ) inst_args = Group( LPAR + (delimitedList( namedPortConnection ) | delimitedList( modulePortConnection )) + RPAR).setName("inst_args") moduleInstance = Group( Group ( identifier + Optional(range) ) + inst_args ).setName("moduleInstance")#.setDebug() moduleInstantiation = Group( identifier + Optional( parameterValueAssignment ) + delimitedList( moduleInstance ).setName("moduleInstanceList") + SEMI ).setName("moduleInstantiation") parameterOverride = Group( "defparam" + delimitedList( paramAssgnmt ) + SEMI ) task = Group( "task" + identifier + SEMI + ZeroOrMore( tfDecl ) + stmtOrNull + "endtask" ) specparamDecl = Group( "specparam" + delimitedList( paramAssgnmt ) + SEMI ) pathDescr1 = Group( LPAR + subscrIdentifier + "=>" + subscrIdentifier + RPAR ) pathDescr2 = Group( LPAR + Group( delimitedList( subscrIdentifier ) ) + "*>" + Group( delimitedList( subscrIdentifier ) ) + RPAR ) pathDescr3 = Group( LPAR + Group( delimitedList( subscrIdentifier ) ) + "=>" + Group( delimitedList( subscrIdentifier ) ) + RPAR ) pathDelayValue = Group( ( LPAR + Group( delimitedList( mintypmaxExpr | expr ) ) + RPAR ) | mintypmaxExpr | expr ) pathDecl = Group( ( pathDescr1 | pathDescr2 | pathDescr3 ) + EQ + pathDelayValue + SEMI ).setName("pathDecl") portConditionExpr = Forward() portConditionTerm = Optional(unop) + subscrIdentifier portConditionExpr << portConditionTerm + Optional( binop + portConditionExpr ) polarityOp = oneOf("+ -") levelSensitivePathDecl1 = Group( if_ + Group(LPAR + portConditionExpr + RPAR) + subscrIdentifier + Optional( polarityOp ) + "=>" + subscrIdentifier + EQ + pathDelayValue + SEMI ) levelSensitivePathDecl2 = Group( if_ + Group(LPAR + portConditionExpr + RPAR) + LPAR + Group( delimitedList( subscrIdentifier ) ) + Optional( polarityOp ) + "*>" + Group( delimitedList( subscrIdentifier ) ) + RPAR + EQ + pathDelayValue + SEMI ) levelSensitivePathDecl = levelSensitivePathDecl1 | levelSensitivePathDecl2 edgeIdentifier = posedge | negedge edgeSensitivePathDecl1 = Group( Optional( if_ + Group(LPAR + expr + RPAR) ) + LPAR + Optional( edgeIdentifier ) + subscrIdentifier + "=>" + LPAR + subscrIdentifier + Optional( polarityOp ) + COLON + expr + RPAR + RPAR + EQ + pathDelayValue + SEMI ) edgeSensitivePathDecl2 = Group( Optional( if_ + Group(LPAR + expr + RPAR) ) + LPAR + Optional( edgeIdentifier ) + subscrIdentifier + "*>" + LPAR + delimitedList( subscrIdentifier ) + Optional( polarityOp ) + COLON + expr + RPAR + RPAR + EQ + pathDelayValue + SEMI ) edgeSensitivePathDecl = edgeSensitivePathDecl1 | edgeSensitivePathDecl2 edgeDescr = oneOf("01 10 0x x1 1x x0").setName("edgeDescr") timCheckEventControl = Group( posedge | negedge | (edge + LBRACK + delimitedList( edgeDescr ) + RBRACK )) timCheckCond = Forward() timCondBinop = oneOf("== === != !==") timCheckCondTerm = ( expr + timCondBinop + scalarConst ) | ( Optional("~") + expr ) timCheckCond << ( ( LPAR + timCheckCond + RPAR ) | timCheckCondTerm ) timCheckEvent = Group( Optional( timCheckEventControl ) + subscrIdentifier + Optional( "&&&" + timCheckCond ) ) timCheckLimit = expr controlledTimingCheckEvent = Group( timCheckEventControl + subscrIdentifier + Optional( "&&&" + timCheckCond ) ) notifyRegister = identifier systemTimingCheck1 = Group( "$setup" + LPAR + timCheckEvent + COMMA + timCheckEvent + COMMA + timCheckLimit + Optional( COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck2 = Group( "$hold" + LPAR + timCheckEvent + COMMA + timCheckEvent + COMMA + timCheckLimit + Optional( COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck3 = Group( "$period" + LPAR + controlledTimingCheckEvent + COMMA + timCheckLimit + Optional( COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck4 = Group( "$width" + LPAR + controlledTimingCheckEvent + COMMA + timCheckLimit + Optional( COMMA + expr + COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck5 = Group( "$skew" + LPAR + timCheckEvent + COMMA + timCheckEvent + COMMA + timCheckLimit + Optional( COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck6 = Group( "$recovery" + LPAR + controlledTimingCheckEvent + COMMA + timCheckEvent + COMMA + timCheckLimit + Optional( COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck7 = Group( "$setuphold" + LPAR + timCheckEvent + COMMA + timCheckEvent + COMMA + timCheckLimit + COMMA + timCheckLimit + Optional( COMMA + notifyRegister ) + RPAR + SEMI ) systemTimingCheck = (FollowedBy('$') + ( systemTimingCheck1 | systemTimingCheck2 | systemTimingCheck3 | systemTimingCheck4 | systemTimingCheck5 | systemTimingCheck6 | systemTimingCheck7 )).setName("systemTimingCheck") sdpd = if_ + Group(LPAR + expr + RPAR) + \ ( pathDescr1 | pathDescr2 ) + EQ + pathDelayValue + SEMI specifyItem = ~Keyword("endspecify") +( specparamDecl | pathDecl | levelSensitivePathDecl | edgeSensitivePathDecl | systemTimingCheck | sdpd ) """ x::= x||= x||= x||= x||= x||= """ specifyBlock = Group( "specify" + ZeroOrMore( specifyItem ) + "endspecify" ).setName("specifyBlock") moduleItem = ~Keyword("endmodule") + ( parameterDecl | inputDecl | outputDecl | inoutDecl | regDecl | netDecl3 | netDecl1 | netDecl2 | timeDecl | integerDecl | realDecl | eventDecl | gateDecl | parameterOverride | continuousAssign | specifyBlock | initialStmt | alwaysStmt | task | functionDecl | # these have to be at the end - they start with identifiers moduleInstantiation | udpInstantiation ) """ All possible moduleItems, from Verilog grammar spec x::= x||= x||= x||= ?||= (spec does not seem consistent for this item) x||= x||= x||= x||= x||= x||= x||= x||= x||= x||= x||= x||= x||= x||= x||= """ portRef = subscrIdentifier portExpr = portRef | Group( LBRACE + delimitedList( portRef ) + RBRACE ) port = portExpr | Group( ( DOT + identifier + LPAR + portExpr + RPAR ) ) moduleHdr = Group ( oneOf("module macromodule") + identifier + Optional( LPAR + Group( Optional( delimitedList( Group(oneOf("input output") + (netDecl1Arg | netDecl2Arg | netDecl3Arg) ) | port ) ) ) + RPAR ) + SEMI ).setName("moduleHdr") module = Group( moduleHdr + Group( ZeroOrMore( moduleItem ) ) + "endmodule" ).setName("module")#.setDebug() udpDecl = outputDecl | inputDecl | regDecl #~ udpInitVal = oneOf("1'b0 1'b1 1'bx 1'bX 1'B0 1'B1 1'Bx 1'BX 1 0 x X") udpInitVal = (Regex("1'[bB][01xX]") | Regex("[01xX]")).setName("udpInitVal") udpInitialStmt = Group( "initial" + identifier + EQ + udpInitVal + SEMI ).setName("udpInitialStmt") levelSymbol = oneOf("0 1 x X ? b B") levelInputList = Group( OneOrMore( levelSymbol ).setName("levelInpList") ) outputSymbol = oneOf("0 1 x X") combEntry = Group( levelInputList + COLON + outputSymbol + SEMI ) edgeSymbol = oneOf("r R f F p P n N *") edge = Group( LPAR + levelSymbol + levelSymbol + RPAR ) | \ Group( edgeSymbol ) edgeInputList = Group( ZeroOrMore( levelSymbol ) + edge + ZeroOrMore( levelSymbol ) ) inputList = levelInputList | edgeInputList seqEntry = Group( inputList + COLON + levelSymbol + COLON + ( outputSymbol | "-" ) + SEMI ).setName("seqEntry") udpTableDefn = Group( "table" + OneOrMore( combEntry | seqEntry ) + "endtable" ).setName("table") """ ::= primitive ( <,>* ) ; + ? endprimitive """ udp = Group( "primitive" + identifier + LPAR + Group( delimitedList( identifier ) ) + RPAR + SEMI + OneOrMore( udpDecl ) + Optional( udpInitialStmt ) + udpTableDefn + "endprimitive" ) verilogbnf = OneOrMore( module | udp ) + StringEnd() verilogbnf.ignore( cppStyleComment ) verilogbnf.ignore( compilerDirective ) return verilogbnf def test( strng ): tokens = [] try: tokens = Verilog_BNF().parseString( strng ) except ParseException as err: print(err.line) print(" "*(err.column-1) + "^") print(err) return tokens #~ if __name__ == "__main__": if 0: import pprint toptest = """ module TOP( in, out ); input [7:0] in; output [5:0] out; COUNT_BITS8 count_bits( .IN( in ), .C( out ) ); endmodule""" pprint.pprint( test(toptest).asList() ) else: def main(): print("Verilog parser test (V %s)" % __version__) print(" - using pyparsing version", pyparsing.__version__) print(" - using Python version", sys.version) if packratOn: print(" - using packrat parsing") if psycoOn: print(" - using psyco runtime optimization") print() import os import gc failCount = 0 Verilog_BNF() numlines = 0 startTime = time.clock() fileDir = "verilog" #~ fileDir = "verilog/new" #~ fileDir = "verilog/new2" #~ fileDir = "verilog/new3" allFiles = [f for f in os.listdir(fileDir) if f.endswith(".v")] #~ allFiles = [ "list_path_delays_test.v" ] #~ allFiles = [ "escapedIdent.v" ] #~ allFiles = filter( lambda f : f.startswith("a") and f.endswith(".v"), os.listdir(fileDir) ) #~ allFiles = filter( lambda f : f.startswith("c") and f.endswith(".v"), os.listdir(fileDir) ) #~ allFiles = [ "ff.v" ] pp = pprint.PrettyPrinter( indent=2 ) totalTime = 0 for vfile in allFiles: gc.collect() fnam = fileDir + "/"+vfile infile = open(fnam) filelines = infile.readlines() infile.close() print(fnam, len(filelines), end=' ') numlines += len(filelines) teststr = "".join(filelines) time1 = time.clock() tokens = test( teststr ) time2 = time.clock() elapsed = time2-time1 totalTime += elapsed if ( len( tokens ) ): print("OK", elapsed) #~ print "tokens=" #~ pp.pprint( tokens.asList() ) #~ print ofnam = fileDir + "/parseOutput/" + vfile + ".parsed.txt" outfile = open(ofnam,"w") outfile.write( teststr ) outfile.write("\n") outfile.write("\n") outfile.write(pp.pformat(tokens.asList())) outfile.write("\n") outfile.close() else: print("failed", elapsed) failCount += 1 for i,line in enumerate(filelines,1): print("%4d: %s" % (i,line.rstrip())) endTime = time.clock() print("Total parse time:", totalTime) print("Total source lines:", numlines) print("Average lines/sec:", ( "%.1f" % (float(numlines)/(totalTime+.05 ) ) )) if failCount: print("FAIL - %d files failed to parse" % failCount) else: print("SUCCESS - all files parsed") return 0 #~ from line_profiler import LineProfiler #~ from pyparsing import ParseResults #~ lp = LineProfiler(ParseResults.__init__) main() #~ lp.print_stats() #~ import hotshot #~ p = hotshot.Profile("vparse.prof",1,1) #~ p.start() #~ main() #~ p.stop() #~ p.close() pyparsing-2.1.10/examples/withAttribute.py0000666000000000000000000000156712466013312016777 0ustar 00000000000000# # withAttribute.py # Copyright, 2007 - Paul McGuire # # Simple example of using withAttribute parse action helper # to define # data = """\  49.950   50.950   51.950  """ from pyparsing import * tdS,tdE = makeHTMLTags("TD") fontS,fontE = makeHTMLTags("FONT") realNum = Combine( Word(nums) + "." + Word(nums) ).setParseAction(lambda t:float(t[0])) NBSP = Literal(" ") patt = tdS + fontS + NBSP + realNum("value") + NBSP + fontE + tdE tdS.setParseAction( withAttribute(align="right",width="80") ) for s in patt.searchString(data): print(s.value) pyparsing-2.1.10/examples/wordsToNum.py0000666000000000000000000000644012754072101016255 0ustar 00000000000000# wordsToNum.py # Copyright 2006, Paul McGuire # # Sample parser grammar to read a number given in words, and return the numeric value. # from pyparsing import * from operator import mul from functools import reduce def makeLit(s,val): ret = CaselessLiteral(s).setName(s) return ret.setParseAction( replaceWith(val) ) unitDefinitions = [ ("zero", 0), ("oh", 0), ("zip", 0), ("zilch", 0), ("nada", 0), ("bupkis", 0), ("one", 1), ("two", 2), ("three", 3), ("four", 4), ("five", 5), ("six", 6), ("seven", 7), ("eight", 8), ("nine", 9), ("ten", 10), ("eleven", 11), ("twelve", 12), ("thirteen", 13), ("fourteen", 14), ("fifteen", 15), ("sixteen", 16), ("seventeen", 17), ("eighteen", 18), ("nineteen", 19), ] units = Or(makeLit(s,v) for s,v in unitDefinitions) tensDefinitions = [ ("ten", 10), ("twenty", 20), ("thirty", 30), ("forty", 40), ("fourty", 40), # for the spelling-challenged... ("fifty", 50), ("sixty", 60), ("seventy", 70), ("eighty", 80), ("ninety", 90), ] tens = Or(makeLit(s,v) for s,v in tensDefinitions) hundreds = makeLit("hundred", 100) majorDefinitions = [ ("thousand", int(1e3)), ("million", int(1e6)), ("billion", int(1e9)), ("trillion", int(1e12)), ("quadrillion", int(1e15)), ("quintillion", int(1e18)), ] mag = Or(makeLit(s,v) for s,v in majorDefinitions) wordprod = lambda t: reduce(mul,t) wordsum = lambda t: sum(t) numPart = (((( units + Optional(hundreds) ).setParseAction(wordprod) + Optional(tens)).setParseAction(wordsum) ^ tens ) + Optional(units) ).setParseAction(wordsum) numWords = OneOrMore( (numPart + Optional(mag)).setParseAction(wordprod) ).setParseAction(wordsum) + StringEnd() numWords.ignore(Literal("-")) numWords.ignore(CaselessLiteral("and")) def test(s,expected): try: fail_expected = (expected is None) success, results_tup = numWords.runTests(s, failureTests=fail_expected) assert success, "Failed test!" if not fail_expected: teststr, results = results_tup[0] observed = results[0] assert expected == observed, "incorrect parsed value, {} -> {}, should be {}".format(teststr, observed, expected) except Exception as exc: print("{}: {}".format(type(exc).__name__, exc)) test("one hundred twenty hundred", None) test("one hundred and twennty", None) test("one hundred and twenty", 120) test("one hundred and three", 103) test("one hundred twenty-three", 123) test("one hundred and twenty three", 123) test("one hundred twenty three million", 123000000) test("one hundred and twenty three million", 123000000) test("one hundred twenty three million and three", 123000003) test("fifteen hundred and sixty five", 1565) test("seventy-seven thousand eight hundred and nineteen", 77819) test("seven hundred seventy-seven thousand seven hundred and seventy-seven", 777777) test("zero", 0) test("forty two", 42) test("fourty two", 42)pyparsing-2.1.10/examples/__init__.py0000666000000000000000000000000012466013312015654 0ustar 00000000000000pyparsing-2.1.10/HowToUsePyparsing.html0000666000000000000000000020762412171434766016267 0ustar 00000000000000 Using the pyparsing module

Using the pyparsing module

Author: Paul McGuire
Address: 
ptmcg@users.sourceforge.net
Revision: 2.0.1
Date: July, 2013
Copyright: Copyright © 2003-2013 Paul McGuire.
abstract:This document provides how-to instructions for the pyparsing library, an easy-to-use Python module for constructing and executing basic text parsers. The pyparsing module is useful for evaluating user-definable expressions, processing custom application language commands, or extracting data from formatted reports.

1   Steps to follow

To parse an incoming data string, the client code must follow these steps:

  1. First define the tokens and patterns to be matched, and assign this to a program variable. Optional results names or parsing actions can also be defined at this time.
  2. Call parseString() or scanString() on this variable, passing in the string to be parsed. During the matching process, whitespace between tokens is skipped by default (although this can be changed). When token matches occur, any defined parse action methods are called.
  3. Process the parsed results, returned as a list of strings. Matching results may also be accessed as named attributes of the returned results, if names are defined in the definition of the token pattern, using setResultsName().

1.1   Hello, World!

The following complete Python program will parse the greeting "Hello, World!", or any other greeting of the form "<salutation>, <addressee>!":

from pyparsing import Word, alphas

greet = Word( alphas ) + "," + Word( alphas ) + "!"
greeting = greet.parseString( "Hello, World!" )
print greeting

The parsed tokens are returned in the following form:

['Hello', ',', 'World', '!']

1.2   Usage notes

  • The pyparsing module can be used to interpret simple command strings or algebraic expressions, or can be used to extract data from text reports with complicated format and structure ("screen or report scraping"). However, it is possible that your defined matching patterns may accept invalid inputs. Use pyparsing to extract data from strings assumed to be well-formatted.

  • To keep up the readability of your code, use operators such as +, |, ^, and ~ to combine expressions. You can also combine string literals with ParseExpressions - they will be automatically converted to Literal objects. For example:

    integer  = Word( nums )            # simple unsigned integer
variable = Word( alphas, max=1 )   # single letter variable, such as x, z, m, etc.
arithOp  = Word( "+-*/", max=1 )   # arithmetic operators
equation = variable + "=" + integer + arithOp + integer    # will match "x=2+2", etc.

    In the definition of equation, the string "=" will get added as a Literal("="), but in a more readable way.

  • The pyparsing module's default behavior is to ignore whitespace. This is the case for 99% of all parsers ever written. This allows you to write simple, clean, grammars, such as the above equation, without having to clutter it up with extraneous ws markers. The equation grammar will successfully parse all of the following statements:

    x=2+2
x = 2+2
a = 10   *   4
r= 1234/ 100000

    Of course, it is quite simple to extend this example to support more elaborate expressions, with nesting with parentheses, floating point numbers, scientific notation, and named constants (such as e or pi). See fourFn.py, included in the examples directory.

  • To modify pyparsing's default whitespace skipping, you can use one or more of the following methods:

    • use the static method ParserElement.setDefaultWhitespaceChars to override the normal set of whitespace chars (' tn'). For instance when defining a grammar in which newlines are significant, you should call ParserElement.setDefaultWhitespaceChars(' \t') to remove newline from the set of skippable whitespace characters. Calling this method will affect all pyparsing expressions defined afterward.

    • call leaveWhitespace() on individual expressions, to suppress the skipping of whitespace before trying to match the expression

    • use Combine to require that successive expressions must be adjacent in the input string. For instance, this expression:

      real = Word(nums) + '.' + Word(nums)

      will match "3.14159", but will also match "3 . 12". It will also return the matched results as ['3', '.', '14159']. By changing this expression to:

      real = Combine( Word(nums) + '.' + Word(nums) )

      it will not match numbers with embedded spaces, and it will return a single concatenated string '3.14159' as the parsed token.

  • Repetition of expressions can be indicated using the '*' operator. An expression may be multiplied by an integer value (to indicate an exact repetition count), or by a tuple containing two integers, or None and an integer, representing min and max repetitions (with None representing no min or no max, depending whether it is the first or second tuple element). See the following examples, where n is used to indicate an integer value:

    • expr*3 is equivalent to expr + expr + expr
    • expr*(2,3) is equivalent to expr + expr + Optional(expr)
    • expr*(n,None) or expr*(n,) is equivalent to expr*n + ZeroOrMore(expr) (read as "at least n instances of expr")
    • expr*(None,n) is equivalent to expr*(0,n) (read as "0 to n instances of expr")
    • expr*(None,None) is equivalent to ZeroOrMore(expr)
    • expr*(1,None) is equivalent to OneOrMore(expr)

    Note that expr*(None,n) does not raise an exception if more than n exprs exist in the input stream; that is, expr*(None,n) does not enforce a maximum number of expr occurrences. If this behavior is desired, then write expr*(None,n) + ~expr.

  • MatchFirst expressions are matched left-to-right, and the first match found will skip all later expressions within, so be sure to define less-specific patterns after more-specific patterns. If you are not sure which expressions are most specific, use Or expressions (defined using the ^ operator) - they will always match the longest expression, although they are more compute-intensive.

  • Or expressions will evaluate all of the specified subexpressions to determine which is the "best" match, that is, which matches the longest string in the input data. In case of a tie, the left-most expression in the Or list will win.

  • If parsing the contents of an entire file, pass it to the parseFile method using:

    expr.parseFile( sourceFile )

  • ParseExceptions will report the location where an expected token or expression failed to match. For example, if we tried to use our "Hello, World!" parser to parse "Hello World!" (leaving out the separating comma), we would get an exception, with the message:

    pyparsing.ParseException: Expected "," (6), (1,7)

    In the case of complex expressions, the reported location may not be exactly where you would expect. See more information under ParseException .

  • Use the Group class to enclose logical groups of tokens within a sublist. This will help organize your results into more hierarchical form (the default behavior is to return matching tokens as a flat list of matching input strings).

  • Punctuation may be significant for matching, but is rarely of much interest in the parsed results. Use the suppress() method to keep these tokens from cluttering up your returned lists of tokens. For example, delimitedList() matches a succession of one or more expressions, separated by delimiters (commas by default), but only returns a list of the actual expressions - the delimiters are used for parsing, but are suppressed from the returned output.

  • Parse actions can be used to convert values from strings to other data types (ints, floats, booleans, etc.).

  • Results names are recommended for retrieving tokens from complex expressions. It is much easier to access a token using its field name than using a positional index, especially if the expression contains optional elements. You can also shortcut the setResultsName call:

    stats = "AVE:" + realNum.setResultsName("average") + \
        "MIN:" + realNum.setResultsName("min") + \
        "MAX:" + realNum.setResultsName("max")

    can now be written as this:

    stats = "AVE:" + realNum("average") + \
        "MIN:" + realNum("min") + \
        "MAX:" + realNum("max")

  • Be careful when defining parse actions that modify global variables or data structures (as in fourFn.py), especially for low level tokens or expressions that may occur within an And expression; an early element of an And may match, but the overall expression may fail.

  • Performance of pyparsing may be slow for complex grammars and/or large input strings. The psyco package can be used to improve the speed of the pyparsing module with no changes to grammar or program logic - observed improvments have been in the 20-50% range.

2   Classes

2.1   Classes in the pyparsing module

ParserElement - abstract base class for all pyparsing classes; methods for code to use are:

  • parseString( sourceString, parseAll=False ) - only called once, on the overall matching pattern; returns a ParseResults object that makes the matched tokens available as a list, and optionally as a dictionary, or as an object with named attributes; if parseAll is set to True, then parseString will raise a ParseException if the grammar does not process the complete input string.

  • parseFile( sourceFile ) - a convenience function, that accepts an input file object or filename. The file contents are passed as a string to parseString(). parseFile also supports the parseAll argument.

  • scanString( sourceString ) - generator function, used to find and extract matching text in the given source string; for each matched text, returns a tuple of:

    • matched tokens (packaged as a ParseResults object)
    • start location of the matched text in the given source string
    • end location in the given source string

    scanString allows you to scan through the input source string for random matches, instead of exhaustively defining the grammar for the entire source text (as would be required with parseString).

  • transformString( sourceString ) - convenience wrapper function for scanString, to process the input source string, and replace matching text with the tokens returned from parse actions defined in the grammar (see setParseAction).

  • searchString( sourceString ) - another convenience wrapper function for scanString, returns a list of the matching tokens returned from each call to scanString.

  • setName( name ) - associate a short descriptive name for this element, useful in displaying exceptions and trace information

  • setResultsName( string, listAllMatches=False ) - name to be given to tokens matching the element; if multiple tokens within a repetition group (such as ZeroOrMore or delimitedList) the default is to return only the last matching token - if listAllMatches is set to True, then a list of all the matching tokens is returned. (New in 1.5.6 - a results name with a trailing '*' character will be interpreted as setting listAllMatches to True.) Note: setResultsName returns a copy of the element so that a single basic element can be referenced multiple times and given different names within a complex grammar.

  • setParseAction( *fn ) - specify one or more functions to call after successful matching of the element; each function is defined as fn( s, loc, toks ), where:

    • s is the original parse string
    • loc is the location in the string where matching started
    • toks is the list of the matched tokens, packaged as a ParseResults object

    Multiple functions can be attached to a ParserElement by specifying multiple arguments to setParseAction, or by calling setParseAction multiple times.

    Each parse action function can return a modified toks list, to perform conversion, or string modifications. For brevity, fn may also be a lambda - here is an example of using a parse action to convert matched integer tokens from strings to integers:

    intNumber = Word(nums).setParseAction( lambda s,l,t: [ int(t[0]) ] )

    If fn does not modify the toks list, it does not need to return anything at all.

  • setBreak( breakFlag=True ) - if breakFlag is True, calls pdb.set_break() as this expression is about to be parsed

  • copy() - returns a copy of a ParserElement; can be used to use the same parse expression in different places in a grammar, with different parse actions attached to each

  • leaveWhitespace() - change default behavior of skipping whitespace before starting matching (mostly used internally to the pyparsing module, rarely used by client code)

  • setWhitespaceChars( chars ) - define the set of chars to be ignored as whitespace before trying to match a specific ParserElement, in place of the default set of whitespace (space, tab, newline, and return)

  • setDefaultWhitespaceChars( chars ) - class-level method to override the default set of whitespace chars for all subsequently created ParserElements (including copies); useful when defining grammars that treat one or more of the default whitespace characters as significant (such as a line-sensitive grammar, to omit newline from the list of ignorable whitespace)

  • suppress() - convenience function to suppress the output of the given element, instead of wrapping it with a Suppress object.

  • ignore( expr ) - function to specify parse expression to be ignored while matching defined patterns; can be called repeatedly to specify multiple expressions; useful to specify patterns of comment syntax, for example

  • setDebug( dbgFlag=True ) - function to enable/disable tracing output when trying to match this element

  • validate() - function to verify that the defined grammar does not contain infinitely recursive constructs

  • parseWithTabs() - function to override default behavior of converting tabs to spaces before parsing the input string; rarely used, except when specifying whitespace-significant grammars using the White class.
  • enablePackrat() - a class-level static method to enable a memoizing performance enhancement, known as "packrat parsing". packrat parsing is disabled by default, since it may conflict with some user programs that use parse actions. To activate the packrat feature, your program must call the class method ParserElement.enablePackrat(). If your program uses psyco to "compile as you go", you must call enablePackrat before calling psyco.full(). If you do not do this, Python will crash. For best results, call enablePackrat() immediately after importing pyparsing.

2.2   Basic ParserElement subclasses

  • Literal - construct with a string to be matched exactly
  • CaselessLiteral - construct with a string to be matched, but without case checking; results are always returned as the defining literal, NOT as they are found in the input string
  • Keyword - similar to Literal, but must be immediately followed by whitespace, punctuation, or other non-keyword characters; prevents accidental matching of a non-keyword that happens to begin with a defined keyword
  • CaselessKeyword - similar to Keyword, but with caseless matching behavior

  • Word - one or more contiguous characters; construct with a string containing the set of allowed initial characters, and an optional second string of allowed body characters; for instance, a common Word construct is to match a code identifier - in C, a valid identifier must start with an alphabetic character or an underscore ('_'), followed by a body that can also include numeric digits. That is, a, i, MAX_LENGTH, _a1, b_109_, and plan9FromOuterSpace are all valid identifiers; 9b7z, $a, .section, and 0debug are not. To define an identifier using a Word, use either of the following:

    - Word( alphas+"_", alphanums+"_" )
- Word( srange("[a-zA-Z_]"), srange("[a-zA-Z0-9_]") )

    If only one string given, it specifies that the same character set defined for the initial character is used for the word body; for instance, to define an identifier that can only be composed of capital letters and underscores, use:

    - Word( "ABCDEFGHIJKLMNOPQRSTUVWXYZ_" )
- Word( srange("[A-Z_]") )

    A Word may also be constructed with any of the following optional parameters:

    • min - indicating a minimum length of matching characters
    • max - indicating a maximum length of matching characters
    • exact - indicating an exact length of matching characters

    If exact is specified, it will override any values for min or max.

    New in 1.5.6 - Sometimes you want to define a word using all characters in a range except for one or two of them; you can do this with the new excludeChars argument. This is helpful if you want to define a word with all printables except for a single delimiter character, such as '.'. Previously, you would have to create a custom string to pass to Word. With this change, you can just create Word(printables, excludeChars='.').

  • CharsNotIn - similar to Word, but matches characters not in the given constructor string (accepts only one string for both initial and body characters); also supports min, max, and exact optional parameters.

  • Regex - a powerful construct, that accepts a regular expression to be matched at the current parse position; accepts an optional flags parameter, corresponding to the flags parameter in the re.compile method; if the expression includes named sub-fields, they will be represented in the returned ParseResults

  • QuotedString - supports the definition of custom quoted string formats, in addition to pyparsing's built-in dblQuotedString and sglQuotedString. QuotedString allows you to specify the following parameters:

    • quoteChar - string of one or more characters defining the quote delimiting string
    • escChar - character to escape quotes, typically backslash (default=None)
    • escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=None)
    • multiline - boolean indicating whether quotes can span multiple lines (default=False)
    • unquoteResults - boolean indicating whether the matched text should be unquoted (default=True)
    • endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=None => same as quoteChar)

  • SkipTo - skips ahead in the input string, accepting any characters up to the specified pattern; may be constructed with the following optional parameters:

    • include - if set to true, also consumes the match expression (default is False)
    • ignore - allows the user to specify patterns to not be matched, to prevent false matches
    • failOn - if a literal string or expression is given for this argument, it defines an expression that should cause the SkipTo expression to fail, and not skip over that expression
  • White - also similar to Word, but matches whitespace characters. Not usually needed, as whitespace is implicitly ignored by pyparsing. However, some grammars are whitespace-sensitive, such as those that use leading tabs or spaces to indicating grouping or hierarchy. (If matching on tab characters, be sure to call parseWithTabs on the top-level parse element.)
  • Empty - a null expression, requiring no characters - will always match; useful for debugging and for specialized grammars
  • NoMatch - opposite of Empty, will never match; useful for debugging and for specialized grammars

2.3   Expression subclasses

  • And - construct with a list of ParserElements, all of which must match for And to match; can also be created using the '+' operator; multiple expressions can be Anded together using the '*' operator as in:

    ipAddress = Word(nums) + ('.'+Word(nums))*3

    A tuple can be used as the multiplier, indicating a min/max:

    usPhoneNumber = Word(nums) + ('-'+Word(nums))*(1,2)

    A special form of And is created if the '-' operator is used instead of the '+' operator. In the ipAddress example above, if no trailing '.' and Word(nums) are found after matching the initial Word(nums), then pyparsing will back up in the grammar and try other alternatives to ipAddress. However, if ipAddress is defined as:

    strictIpAddress = Word(nums) - ('.'+Word(nums))*3

    then no backing up is done. If the first Word(nums) of strictIpAddress is matched, then any mismatch after that will raise a ParseSyntaxException, which will halt the parsing process immediately. By careful use of the '-' operator, grammars can provide meaningful error messages close to the location where the incoming text does not match the specified grammar.

  • Or - construct with a list of ParserElements, any of which must match for Or to match; if more than one expression matches, the expression that makes the longest match will be used; can also be created using the '^' operator

  • MatchFirst - construct with a list of ParserElements, any of which must match for MatchFirst to match; matching is done left-to-right, taking the first expression that matches; can also be created using the '|' operator

  • Each - similar to And, in that all of the provided expressions must match; however, Each permits matching to be done in any order; can also be created using the '&' operator

  • Optional - construct with a ParserElement, but this element is not required to match; can be constructed with an optional default argument, containing a default string or object to be supplied if the given optional parse element is not found in the input string; parse action will only be called if a match is found, or if a default is specified

  • ZeroOrMore - similar to Optional, but can be repeated

  • OneOrMore - similar to ZeroOrMore, but at least one match must be present

  • FollowedBy - a lookahead expression, requires matching of the given expressions, but does not advance the parsing position within the input string

  • NotAny - a negative lookahead expression, prevents matching of named expressions, does not advance the parsing position within the input string; can also be created using the unary '~' operator

2.4   Expression operators

  • ~ - creates NotAny using the expression after the operator
  • + - creates And using the expressions before and after the operator
  • | - creates MatchFirst (first left-to-right match) using the expressions before and after the operator
  • ^ - creates Or (longest match) using the expressions before and after the operator
  • & - creates Each using the expressions before and after the operator
  • * - creates And by multiplying the expression by the integer operand; if expression is multiplied by a 2-tuple, creates an And of (min,max) expressions (similar to "{min,max}" form in regular expressions); if min is None, intepret as (0,max); if max is None, interpret as expr*min + ZeroOrMore(expr)
  • - - like + but with no backup and retry of alternatives
  • * - repetition of expression
  • == - matching expression to string; returns True if the string matches the given expression
  • <<= - inserts the expression following the operator as the body of the Forward expression before the operator (formerly <<, which is now deprecated)

2.5   Positional subclasses

  • StringStart - matches beginning of the text
  • StringEnd - matches the end of the text
  • LineStart - matches beginning of a line (lines delimited by \n characters)
  • LineEnd - matches the end of a line
  • WordStart - matches a leading word boundary
  • WordEnd - matches a trailing word boundary

2.6   Converter subclasses

  • Upcase - converts matched tokens to uppercase (deprecated - use upcaseTokens parse action instead)
  • Combine - joins all matched tokens into a single string, using specified joinString (default joinString=""); expects all matching tokens to be adjacent, with no intervening whitespace (can be overridden by specifying adjacent=False in constructor)
  • Suppress - clears matched tokens; useful to keep returned results from being cluttered with required but uninteresting tokens (such as list delimiters)

2.7   Special subclasses

  • Group - causes the matched tokens to be enclosed in a list; useful in repeated elements like ZeroOrMore and OneOrMore to break up matched tokens into groups for each repeated pattern
  • Dict - like Group, but also constructs a dictionary, using the [0]'th elements of all enclosed token lists as the keys, and each token list as the value
  • SkipTo - catch-all matching expression that accepts all characters up until the given pattern is found to match; useful for specifying incomplete grammars
  • Forward - placeholder token used to define recursive token patterns; when defining the actual expression later in the program, insert it into the Forward object using the <<= operator (see fourFn.py for an example).

2.8   Other classes

  • ParseResults - class used to contain and manage the lists of tokens created from parsing the input using the user-defined parse expression. ParseResults can be accessed in a number of ways:

    • as a list
      • total list of elements can be found using len()
      • individual elements can be found using [0], [1], [-1], etc.
      • elements can be deleted using del
      • the -1th element can be extracted and removed in a single operation using pop(), or any element can be extracted and removed using pop(n)
    • as a dictionary
      • if setResultsName() is used to name elements within the overall parse expression, then these fields can be referenced as dictionary elements or as attributes
      • the Dict class generates dictionary entries using the data of the input text - in addition to ParseResults listed as [ [ a1, b1, c1, ...], [ a2, b2, c2, ...]  ] it also acts as a dictionary with entries defined as { a1 : [ b1, c1, ... ] }, { a2 : [ b2, c2, ... ] }; this is especially useful when processing tabular data where the first column contains a key value for that line of data
      • list elements that are deleted using del will still be accessible by their dictionary keys
      • supports get(), items() and keys() methods, similar to a dictionary
      • a keyed item can be extracted and removed using pop(key). Here key must be non-numeric (such as a string), in order to use dict extraction instead of list extraction.
      • new named elements can be added (in a parse action, for instance), using the same syntax as adding an item to a dict (parseResults["X"]="new item"); named elements can be removed using del parseResults["X"]
    • as a nested list
      • results returned from the Group class are encapsulated within their own list structure, so that the tokens can be handled as a hierarchical tree

    ParseResults can also be converted to an ordinary list of strings by calling asList(). Note that this will strip the results of any field names that have been defined for any embedded parse elements. (The pprint module is especially good at printing out the nested contents given by asList().)

    Finally, ParseResults can be converted to an XML string by calling asXML(). Where possible, results will be tagged using the results names defined for the respective ParseExpressions. asXML() takes two optional arguments:

    • doctagname - for ParseResults that do not have a defined name, this argument will wrap the resulting XML in a set of opening and closing tags <doctagname> and </doctagname>.
    • namedItemsOnly (default=False) - flag to indicate if the generated XML should skip items that do not have defined names. If a nested group item is named, then all embedded items will be included, whether they have names or not.

2.9   Exception classes and Troubleshooting

  • ParseException - exception returned when a grammar parse fails; ParseExceptions have attributes loc, msg, line, lineno, and column; to view the text line and location where the reported ParseException occurs, use:

    except ParseException, err:
    print err.line
    print " "*(err.column-1) + "^"
    print err

  • RecursiveGrammarException - exception returned by validate() if the grammar contains a recursive infinite loop, such as:

    badGrammar = Forward()
goodToken = Literal("A")
badGrammar <<= Optional(goodToken) + badGrammar

  • ParseFatalException - exception that parse actions can raise to stop parsing immediately. Should be used when a semantic error is found in the input text, such as a mismatched XML tag.

  • ParseSyntaxException - subclass of ParseFatalException raised when a syntax error is found, based on the use of the '-' operator when defining a sequence of expressions in an And expression.

You can also get some insights into the parsing logic using diagnostic parse actions, and setDebug(), or test the matching of expression fragments by testing them using scanString().

3   Miscellaneous attributes and methods

3.1   Helper methods

  • delimitedList( expr, delim=',') - convenience function for matching one or more occurrences of expr, separated by delim. By default, the delimiters are suppressed, so the returned results contain only the separate list elements. Can optionally specify combine=True, indicating that the expressions and delimiters should be returned as one combined value (useful for scoped variables, such as "a.b.c", or "a::b::c", or paths such as "a/b/c").

  • countedArray( expr ) - convenience function for a pattern where an list of instances of the given expression are preceded by an integer giving the count of elements in the list. Returns an expression that parses the leading integer, reads exactly that many expressions, and returns the array of expressions in the parse results - the leading integer is suppressed from the results (although it is easily reconstructed by using len on the returned array).

  • oneOf( string, caseless=False ) - convenience function for quickly declaring an alternative set of Literal tokens, by splitting the given string on whitespace boundaries. The tokens are sorted so that longer matches are attempted first; this ensures that a short token does not mask a longer one that starts with the same characters. If caseless=True, will create an alternative set of CaselessLiteral tokens.

  • dictOf( key, value ) - convenience function for quickly declaring a dictionary pattern of Dict( ZeroOrMore( Group( key + value ) ) ).

  • makeHTMLTags( tagName ) and makeXMLTags( tagName ) - convenience functions to create definitions of opening and closing tag expressions. Returns a pair of expressions, for the corresponding <tag> and </tag> strings. Includes support for attributes in the opening tag, such as <tag attr1="abc"> - attributes are returned as keyed tokens in the returned ParseResults. makeHTMLTags is less restrictive than makeXMLTags, especially with respect to case sensitivity.

  • infixNotation(baseOperand, operatorList) - (formerly named operatorPrecedence) convenience function to define a grammar for parsing infix notation expressions with a hierarchical precedence of operators. To use the infixNotation helper:

    1. Define the base "atom" operand term of the grammar. For this simple grammar, the smallest operand is either and integer or a variable. This will be the first argument to the infixNotation method.
    2. Define a list of tuples for each level of operator precendence. Each tuple is of the form (opExpr, numTerms, rightLeftAssoc, parseAction), where:
      • opExpr is the pyparsing expression for the operator; may also be a string, which will be converted to a Literal; if None, indicates an empty operator, such as the implied multiplication operation between 'm' and 'x' in "y = mx + b". If numTerms parameter is 3, this must be a 2-tuple containing the 2 delimiting operators.
      • numTerms is the number of terms for this operator (must be 1,2, or 3)
      • rightLeftAssoc is the indicator whether the operator is right or left associative, using the pyparsing-defined constants opAssoc.RIGHT and opAssoc.LEFT.
      • parseAction is the parse action to be associated with expressions matching this operator expression (the parse action tuple member may be omitted)
    3. Call infixNotation passing the operand expression and the operator precedence list, and save the returned value as the generated pyparsing expression. You can then use this expression to parse input strings, or incorporate it into a larger, more complex grammar.

  • matchPreviousLiteral and matchPreviousExpr - function to define and expression that matches the same content as was parsed in a previous parse expression. For instance:

    first = Word(nums)
matchExpr = first + ":" + matchPreviousLiteral(first)

    will match "1:1", but not "1:2". Since this matches at the literal level, this will also match the leading "1:1" in "1:10".

    In contrast:

    first = Word(nums)
matchExpr = first + ":" + matchPreviousExpr(first)

    will not match the leading "1:1" in "1:10"; the expressions are evaluated first, and then compared, so "1" is compared with "10".

  • nestedExpr(opener, closer, content=None, ignoreExpr=quotedString) - method for defining nested lists enclosed in opening and closing delimiters.

    • opener - opening character for a nested list (default="("); can also be a pyparsing expression
    • closer - closing character for a nested list (default=")"); can also be a pyparsing expression
    • content - expression for items within the nested lists (default=None)
    • ignoreExpr - expression for ignoring opening and closing delimiters (default=quotedString)

    If an expression is not provided for the content argument, the nested expression will capture all whitespace-delimited content between delimiters as a list of separate values.

    Use the ignoreExpr argument to define expressions that may contain opening or closing characters that should not be treated as opening or closing characters for nesting, such as quotedString or a comment expression. Specify multiple expressions using an Or or MatchFirst. The default is quotedString, but if no expressions are to be ignored, then pass None for this argument.

  • indentedBlock( statementExpr, indentationStackVar, indent=True) - function to define an indented block of statements, similar to indentation-based blocking in Python source code:

    • statementExpr - the expression defining a statement that will be found in the indented block; a valid indentedBlock must contain at least 1 matching statementExpr
    • indentationStackVar - a Python list variable; this variable should be common to all indentedBlock expressions defined within the same grammar, and should be reinitialized to [1] each time the grammar is to be used
    • indent - a boolean flag indicating whether the expressions within the block must be indented from the current parse location; if using indentedBlock to define the left-most statements (all starting in column 1), set indent to False

  • originalTextFor( expr ) - helper function to preserve the originally parsed text, regardless of any token processing or conversion done by the contained expression. For instance, the following expression:

    fullName = Word(alphas) + Word(alphas)

    will return the parse of "John Smith" as ['John', 'Smith']. In some applications, the actual name as it was given in the input string is what is desired. To do this, use originalTextFor:

    fullName = originalTextFor(Word(alphas) + Word(alphas))

  • ungroup( expr ) - function to "ungroup" returned tokens; useful to undo the default behavior of And to always group the returned tokens, even if there is only one in the list. (New in 1.5.6)

  • lineno( loc, string ) - function to give the line number of the location within the string; the first line is line 1, newlines start new rows

  • col( loc, string ) - function to give the column number of the location within the string; the first column is column 1, newlines reset the column number to 1

  • line( loc, string ) - function to retrieve the line of text representing lineno( loc, string ); useful when printing out diagnostic messages for exceptions

  • srange( rangeSpec ) - function to define a string of characters, given a string of the form used by regexp string ranges, such as "[0-9]" for all numeric digits, "[A-Z_]" for uppercase characters plus underscore, and so on (note that rangeSpec does not include support for generic regular expressions, just string range specs)

  • getTokensEndLoc() - function to call from within a parse action to get the ending location for the matched tokens

  • traceParseAction(fn) - decorator function to debug parse actions. Lists each call, called arguments, and return value or exception

3.2   Helper parse actions

  • removeQuotes - removes the first and last characters of a quoted string; useful to remove the delimiting quotes from quoted strings

  • replaceWith(replString) - returns a parse action that simply returns the replString; useful when using transformString, or converting HTML entities, as in:

    nbsp = Literal("&nbsp;").setParseAction( replaceWith("<BLANK>") )

  • keepOriginalText- (deprecated, use originalTextFor instead) restores any internal whitespace or suppressed text within the tokens for a matched parse expression. This is especially useful when defining expressions for scanString or transformString applications.

  • withAttribute( *args, **kwargs ) - helper to create a validating parse action to be used with start tags created with makeXMLTags or makeHTMLTags. Use withAttribute to qualify a starting tag with a required attribute value, to avoid false matches on common tags such as <TD> or <DIV>.

    withAttribute can be called with:

    • keyword arguments, as in (class="Customer",align="right"), or
    • a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") )

    An attribute can be specified to have the special value withAttribute.ANY_VALUE, which will match any value - use this to ensure that an attribute is present but any attribute value is acceptable.

  • downcaseTokens - converts all matched tokens to lowercase

  • upcaseTokens - converts all matched tokens to uppercase

  • matchOnlyAtCol( columnNumber ) - a parse action that verifies that an expression was matched at a particular column, raising a ParseException if matching at a different column number; useful when parsing tabular data

3.3   Common string and token constants

  • alphas - same as string.letters

  • nums - same as string.digits

  • alphanums - a string containing alphas + nums

  • alphas8bit - a string containing alphabetic 8-bit characters:

    ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ

  • printables - same as string.printable, minus the space (' ') character

  • empty - a global Empty(); will always match

  • sglQuotedString - a string of characters enclosed in 's; may include whitespace, but not newlines

  • dblQuotedString - a string of characters enclosed in "s; may include whitespace, but not newlines

  • quotedString - sglQuotedString | dblQuotedString

  • cStyleComment - a comment block delimited by '/*' and '*/' sequences; can span multiple lines, but does not support nesting of comments

  • htmlComment - a comment block delimited by '<!--' and '-->' sequences; can span multiple lines, but does not support nesting of comments

  • commaSeparatedList - similar to delimitedList, except that the list expressions can be any text value, or a quoted string; quoted strings can safely include commas without incorrectly breaking the string into two tokens

  • restOfLine - all remaining printable characters up to but not including the next newline

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pyparsing-2.1.10/htmldoc/crarr.png0000666000000000000000000000052412775575455015241 0ustar 00000000000000PNG  IHDR eE,tEXtCreation TimeTue 22 Aug 2006 00:43:10 -0500` XtIME)} pHYsnu>gAMA aEPLTEðf4sW ЊrD`@bCܖX{`,lNo@xdE螊dƴ~TwvtRNS@fMIDATxc`@0&+(;; /EXؑ? n  b;'+Y#(r<"IENDB`pyparsing-2.1.10/htmldoc/epydoc.css0000666000000000000000000003773112775575455015431 0ustar 00000000000000 /* Epydoc CSS Stylesheet * * This stylesheet can be used to customize the appearance of epydoc's * HTML output. * */ /* Default Colors & Styles * - Set the default foreground & background color with 'body'; and * link colors with 'a:link' and 'a:visited'. * - Use bold for decision list terms. * - The heading styles defined here are used for headings *within* * docstring descriptions. All headings used by epydoc itself use * either class='epydoc' or class='toc' (CSS styles for both * defined below). */ body { background: #ffffff; color: #000000; } p { margin-top: 0.5em; margin-bottom: 0.5em; } a:link { color: #0000ff; } a:visited { color: #204080; } dt { font-weight: bold; } h1 { font-size: +140%; font-style: italic; font-weight: bold; } h2 { font-size: +125%; font-style: italic; font-weight: bold; } h3 { font-size: +110%; font-style: italic; font-weight: normal; } code { font-size: 100%; } /* N.B.: class, not pseudoclass */ a.link { font-family: monospace; } /* Page Header & Footer * - The standard page header consists of a navigation bar (with * pointers to standard pages such as 'home' and 'trees'); a * breadcrumbs list, which can be used to navigate to containing * classes or modules; options links, to show/hide private * variables and to show/hide frames; and a page title (using *

). The page title may be followed by a link to the * corresponding source code (using 'span.codelink'). * - The footer consists of a navigation bar, a timestamp, and a * pointer to epydoc's homepage. */ h1.epydoc { margin: 0; font-size: +140%; font-weight: bold; } h2.epydoc { font-size: +130%; font-weight: bold; } h3.epydoc { font-size: +115%; font-weight: bold; margin-top: 0.2em; } td h3.epydoc { font-size: +115%; font-weight: bold; margin-bottom: 0; } table.navbar { background: #a0c0ff; color: #000000; border: 2px groove #c0d0d0; } table.navbar table { color: #000000; } th.navbar-select { background: #70b0ff; color: #000000; } table.navbar a { text-decoration: none; } table.navbar a:link { color: #0000ff; } table.navbar a:visited { color: #204080; } span.breadcrumbs { font-size: 85%; font-weight: bold; } span.options { font-size: 70%; } span.codelink { font-size: 85%; } td.footer { font-size: 85%; } /* Table Headers * - Each summary table and details section begins with a 'header' * row. This row contains a section title (marked by * 'span.table-header') as well as a show/hide private link * (marked by 'span.options', defined above). * - Summary tables that contain user-defined groups mark those * groups using 'group header' rows. */ td.table-header { background: #70b0ff; color: #000000; border: 1px solid #608090; } td.table-header table { color: #000000; } td.table-header table a:link { color: #0000ff; } td.table-header table a:visited { color: #204080; } span.table-header { font-size: 120%; font-weight: bold; } th.group-header { background: #c0e0f8; color: #000000; text-align: left; font-style: italic; font-size: 115%; border: 1px solid #608090; } /* Summary Tables (functions, variables, etc) * - Each object is described by a single row of the table with * two cells. The left cell gives the object's type, and is * marked with 'code.summary-type'. The right cell gives the * object's name and a summary description. * - CSS styles for the table's header and group headers are * defined above, under 'Table Headers' */ table.summary { border-collapse: collapse; background: #e8f0f8; color: #000000; border: 1px solid #608090; margin-bottom: 0.5em; } td.summary { border: 1px solid #608090; } code.summary-type { font-size: 85%; } table.summary a:link { color: #0000ff; } table.summary a:visited { color: #204080; } /* Details Tables (functions, variables, etc) * - Each object is described in its own div. * - A single-row summary table w/ table-header is used as * a header for each details section (CSS style for table-header * is defined above, under 'Table Headers'). */ table.details { border-collapse: collapse; background: #e8f0f8; color: #000000; border: 1px solid #608090; margin: .2em 0 0 0; } table.details table { color: #000000; } table.details a:link { color: #0000ff; } table.details a:visited { color: #204080; } /* Fields */ dl.fields { margin-left: 2em; margin-top: 1em; margin-bottom: 1em; } dl.fields dd ul { margin-left: 0em; padding-left: 0em; } dl.fields dd ul li ul { margin-left: 2em; padding-left: 0em; } div.fields { margin-left: 2em; } div.fields p { margin-bottom: 0.5em; } /* Index tables (identifier index, term index, etc) * - link-index is used for indices containing lists of links * (namely, the identifier index & term index). * - index-where is used in link indices for the text indicating * the container/source for each link. * - metadata-index is used for indices containing metadata * extracted from fields (namely, the bug index & todo index). */ table.link-index { border-collapse: collapse; background: #e8f0f8; color: #000000; border: 1px solid #608090; } td.link-index { border-width: 0px; } table.link-index a:link { color: #0000ff; } table.link-index a:visited { color: #204080; } span.index-where { font-size: 70%; } table.metadata-index { border-collapse: collapse; background: #e8f0f8; color: #000000; border: 1px solid #608090; margin: .2em 0 0 0; } td.metadata-index { border-width: 1px; border-style: solid; } table.metadata-index a:link { color: #0000ff; } table.metadata-index a:visited { color: #204080; } /* Function signatures * - sig* is used for the signature in the details section. * - .summary-sig* is used for the signature in the summary * table, and when listing property accessor functions. * */ .sig-name { color: #006080; } .sig-arg { color: #008060; } .sig-default { color: #602000; } .summary-sig { font-family: monospace; } .summary-sig-name { color: #006080; font-weight: bold; } table.summary a.summary-sig-name:link { color: #006080; font-weight: bold; } table.summary a.summary-sig-name:visited { color: #006080; font-weight: bold; } .summary-sig-arg { color: #006040; } .summary-sig-default { color: #501800; } /* Subclass list */ ul.subclass-list { display: inline; } ul.subclass-list li { display: inline; } /* To render variables, classes etc. like functions */ table.summary .summary-name { color: #006080; font-weight: bold; font-family: monospace; } table.summary a.summary-name:link { color: #006080; font-weight: bold; font-family: monospace; } table.summary a.summary-name:visited { color: #006080; font-weight: bold; font-family: monospace; } /* Variable values * - In the 'variable details' sections, each varaible's value is * listed in a 'pre.variable' box. The width of this box is * restricted to 80 chars; if the value's repr is longer than * this it will be wrapped, using a backslash marked with * class 'variable-linewrap'. If the value's repr is longer * than 3 lines, the rest will be ellided; and an ellipsis * marker ('...' marked with 'variable-ellipsis') will be used. * - If the value is a string, its quote marks will be marked * with 'variable-quote'. * - If the variable is a regexp, it is syntax-highlighted using * the re* CSS classes. */ pre.variable { padding: .5em; margin: 0; background: #dce4ec; color: #000000; border: 1px solid #708890; } .variable-linewrap { color: #604000; font-weight: bold; } .variable-ellipsis { color: #604000; font-weight: bold; } .variable-quote { color: #604000; font-weight: bold; } .variable-group { color: #008000; font-weight: bold; } .variable-op { color: #604000; font-weight: bold; } .variable-string { color: #006030; } .variable-unknown { color: #a00000; font-weight: bold; } .re { color: #000000; } .re-char { color: #006030; } .re-op { color: #600000; } .re-group { color: #003060; } .re-ref { color: #404040; } /* Base tree * - Used by class pages to display the base class hierarchy. */ pre.base-tree { font-size: 80%; margin: 0; } /* Frames-based table of contents headers * - Consists of two frames: one for selecting modules; and * the other listing the contents of the selected module. * - h1.toc is used for each frame's heading * - h2.toc is used for subheadings within each frame. */ h1.toc { text-align: center; font-size: 105%; margin: 0; font-weight: bold; padding: 0; } h2.toc { font-size: 100%; font-weight: bold; margin: 0.5em 0 0 -0.3em; } /* Syntax Highlighting for Source Code * - doctest examples are displayed in a 'pre.py-doctest' block. * If the example is in a details table entry, then it will use * the colors specified by the 'table pre.py-doctest' line. * - Source code listings are displayed in a 'pre.py-src' block. * Each line is marked with 'span.py-line' (used to draw a line * down the left margin, separating the code from the line * numbers). Line numbers are displayed with 'span.py-lineno'. * The expand/collapse block toggle button is displayed with * 'a.py-toggle' (Note: the CSS style for 'a.py-toggle' should not * modify the font size of the text.) * - If a source code page is opened with an anchor, then the * corresponding code block will be highlighted. The code * block's header is highlighted with 'py-highlight-hdr'; and * the code block's body is highlighted with 'py-highlight'. * - The remaining py-* classes are used to perform syntax * highlighting (py-string for string literals, py-name for names, * etc.) */ pre.py-doctest { padding: .5em; margin: 1em; background: #e8f0f8; color: #000000; border: 1px solid #708890; } table pre.py-doctest { background: #dce4ec; color: #000000; } pre.py-src { border: 2px solid #000000; background: #f0f0f0; color: #000000; } .py-line { border-left: 2px solid #000000; margin-left: .2em; padding-left: .4em; } .py-lineno { font-style: italic; font-size: 90%; padding-left: .5em; } a.py-toggle { text-decoration: none; } div.py-highlight-hdr { border-top: 2px solid #000000; border-bottom: 2px solid #000000; background: #d8e8e8; } div.py-highlight { border-bottom: 2px solid #000000; background: #d0e0e0; } .py-prompt { color: #005050; font-weight: bold;} .py-more { color: #005050; font-weight: bold;} .py-string { color: #006030; } .py-comment { color: #003060; } .py-keyword { color: #600000; } .py-output { color: #404040; } .py-name { color: #000050; } .py-name:link { color: #000050 !important; } .py-name:visited { color: #000050 !important; } .py-number { color: #005000; } .py-defname { color: #000060; font-weight: bold; } .py-def-name { color: #000060; font-weight: bold; } .py-base-class { color: #000060; } .py-param { color: #000060; } .py-docstring { color: #006030; } .py-decorator { color: #804020; } /* Use this if you don't want links to names underlined: */ /*a.py-name { text-decoration: none; }*/ /* Graphs & Diagrams * - These CSS styles are used for graphs & diagrams generated using * Graphviz dot. 'img.graph-without-title' is used for bare * diagrams (to remove the border created by making the image * clickable). */ img.graph-without-title { border: none; } img.graph-with-title { border: 1px solid #000000; } span.graph-title { font-weight: bold; } span.graph-caption { } /* General-purpose classes * - 'p.indent-wrapped-lines' defines a paragraph whose first line * is not indented, but whose subsequent lines are. * - The 'nomargin-top' class is used to remove the top margin (e.g. * from lists). The 'nomargin' class is used to remove both the * top and bottom margin (but not the left or right margin -- * for lists, that would cause the bullets to disappear.) */ p.indent-wrapped-lines { padding: 0 0 0 7em; text-indent: -7em; margin: 0; } .nomargin-top { margin-top: 0; } .nomargin { margin-top: 0; margin-bottom: 0; } /* HTML Log */ div.log-block { padding: 0; margin: .5em 0 .5em 0; background: #e8f0f8; color: #000000; border: 1px solid #000000; } div.log-error { padding: .1em .3em .1em .3em; margin: 4px; background: #ffb0b0; color: #000000; border: 1px solid #000000; } div.log-warning { padding: .1em .3em .1em .3em; margin: 4px; background: #ffffb0; color: #000000; border: 1px solid #000000; } div.log-info { padding: .1em .3em .1em .3em; margin: 4px; background: #b0ffb0; color: #000000; border: 1px solid #000000; } h2.log-hdr { background: #70b0ff; color: #000000; margin: 0; padding: 0em 0.5em 0em 0.5em; border-bottom: 1px solid #000000; font-size: 110%; } p.log { font-weight: bold; margin: .5em 0 .5em 0; } tr.opt-changed { color: #000000; font-weight: bold; } tr.opt-default { color: #606060; } pre.log { margin: 0; padding: 0; padding-left: 1em; } pyparsing-2.1.10/htmldoc/epydoc.js0000666000000000000000000002517212775575455015251 0ustar 00000000000000function toggle_private() { // Search for any private/public links on this page. Store // their old text in "cmd," so we will know what action to // take; and change their text to the opposite action. var cmd = "?"; var elts = document.getElementsByTagName("a"); for(var i=0; i...
"; elt.innerHTML = s; } } function toggle(id) { elt = document.getElementById(id+"-toggle"); if (elt.innerHTML == "-") collapse(id); else expand(id); return false; } function highlight(id) { var elt = document.getElementById(id+"-def"); if (elt) elt.className = "py-highlight-hdr"; var elt = document.getElementById(id+"-expanded"); if (elt) elt.className = "py-highlight"; var elt = document.getElementById(id+"-collapsed"); if (elt) elt.className = "py-highlight"; } function num_lines(s) { var n = 1; var pos = s.indexOf("\n"); while ( pos > 0) { n += 1; pos = s.indexOf("\n", pos+1); } return n; } // Collapse all blocks that mave more than `min_lines` lines. function collapse_all(min_lines) { var elts = document.getElementsByTagName("div"); for (var i=0; i 0) if (elt.id.substring(split, elt.id.length) == "-expanded") if (num_lines(elt.innerHTML) > min_lines) collapse(elt.id.substring(0, split)); } } function expandto(href) { var start = href.indexOf("#")+1; if (start != 0 && start != href.length) { if (href.substring(start, href.length) != "-") { collapse_all(4); pos = href.indexOf(".", start); while (pos != -1) { var id = href.substring(start, pos); expand(id); pos = href.indexOf(".", pos+1); } var id = href.substring(start, href.length); expand(id); highlight(id); } } } function kill_doclink(id) { var parent = document.getElementById(id); parent.removeChild(parent.childNodes.item(0)); } function auto_kill_doclink(ev) { if (!ev) var ev = window.event; if (!this.contains(ev.toElement)) { var parent = document.getElementById(this.parentID); parent.removeChild(parent.childNodes.item(0)); } } function doclink(id, name, targets_id) { var elt = document.getElementById(id); // If we already opened the box, then destroy it. // (This case should never occur, but leave it in just in case.) if (elt.childNodes.length > 1) { elt.removeChild(elt.childNodes.item(0)); } else { // The outer box: relative + inline positioning. var box1 = document.createElement("div"); box1.style.position = "relative"; box1.style.display = "inline"; box1.style.top = 0; box1.style.left = 0; // A shadow for fun var shadow = document.createElement("div"); shadow.style.position = "absolute"; shadow.style.left = "-1.3em"; shadow.style.top = "-1.3em"; shadow.style.background = "#404040"; // The inner box: absolute positioning. var box2 = document.createElement("div"); box2.style.position = "relative"; box2.style.border = "1px solid #a0a0a0"; box2.style.left = "-.2em"; box2.style.top = "-.2em"; box2.style.background = "white"; box2.style.padding = ".3em .4em .3em .4em"; box2.style.fontStyle = "normal"; box2.onmouseout=auto_kill_doclink; box2.parentID = id; // Get the targets var targets_elt = document.getElementById(targets_id); var targets = targets_elt.getAttribute("targets"); var links = ""; target_list = targets.split(","); for (var i=0; i" + target[0] + ""; } // Put it all together. elt.insertBefore(box1, elt.childNodes.item(0)); //box1.appendChild(box2); box1.appendChild(shadow); shadow.appendChild(box2); box2.innerHTML = "Which "+name+" do you want to see documentation for?" + ""; } return false; } function get_anchor() { var href = location.href; var start = href.indexOf("#")+1; if ((start != 0) && (start != href.length)) return href.substring(start, href.length); } function redirect_url(dottedName) { // Scan through each element of the "pages" list, and check // if "name" matches with any of them. for (var i=0; i-m" or "-c"; // extract the portion & compare it to dottedName. var pagename = pages[i].substring(0, pages[i].length-2); if (pagename == dottedName.substring(0,pagename.length)) { // We've found a page that matches `dottedName`; // construct its URL, using leftover `dottedName` // content to form an anchor. var pagetype = pages[i].charAt(pages[i].length-1); var url = pagename + ((pagetype=="m")?"-module.html": "-class.html"); if (dottedName.length > pagename.length) url += "#" + dottedName.substring(pagename.length+1, dottedName.length); return url; } } } pyparsing-2.1.10/htmldoc/frames.html0000666000000000000000000000110712775575455015563 0ustar 00000000000000 pyparsing pyparsing-2.1.10/htmldoc/help.html0000666000000000000000000002527512775575455015252 0ustar 00000000000000 Help
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API Documentation

This document contains the API (Application Programming Interface) documentation for pyparsing. Documentation for the Python objects defined by the project is divided into separate pages for each package, module, and class. The API documentation also includes two pages containing information about the project as a whole: a trees page, and an index page.

Object Documentation

Each Package Documentation page contains:

  • A description of the package.
  • A list of the modules and sub-packages contained by the package.
  • A summary of the classes defined by the package.
  • A summary of the functions defined by the package.
  • A summary of the variables defined by the package.
  • A detailed description of each function defined by the package.
  • A detailed description of each variable defined by the package.

Each Module Documentation page contains:

  • A description of the module.
  • A summary of the classes defined by the module.
  • A summary of the functions defined by the module.
  • A summary of the variables defined by the module.
  • A detailed description of each function defined by the module.
  • A detailed description of each variable defined by the module.

Each Class Documentation page contains:

  • A class inheritance diagram.
  • A list of known subclasses.
  • A description of the class.
  • A summary of the methods defined by the class.
  • A summary of the instance variables defined by the class.
  • A summary of the class (static) variables defined by the class.
  • A detailed description of each method defined by the class.
  • A detailed description of each instance variable defined by the class.
  • A detailed description of each class (static) variable defined by the class.

Project Documentation

The Trees page contains the module and class hierarchies:

  • The module hierarchy lists every package and module, with modules grouped into packages. At the top level, and within each package, modules and sub-packages are listed alphabetically.
  • The class hierarchy lists every class, grouped by base class. If a class has more than one base class, then it will be listed under each base class. At the top level, and under each base class, classes are listed alphabetically.

The Index page contains indices of terms and identifiers:

  • The term index lists every term indexed by any object's documentation. For each term, the index provides links to each place where the term is indexed.
  • The identifier index lists the (short) name of every package, module, class, method, function, variable, and parameter. For each identifier, the index provides a short description, and a link to its documentation.

The Table of Contents

The table of contents occupies the two frames on the left side of the window. The upper-left frame displays the project contents, and the lower-left frame displays the module contents:

Project
Contents
...		 API
Documentation
Frame
Module
Contents
 
...
 

The project contents frame contains a list of all packages and modules that are defined by the project. Clicking on an entry will display its contents in the module contents frame. Clicking on a special entry, labeled "Everything," will display the contents of the entire project.

The module contents frame contains a list of every submodule, class, type, exception, function, and variable defined by a module or package. Clicking on an entry will display its documentation in the API documentation frame. Clicking on the name of the module, at the top of the frame, will display the documentation for the module itself.

The "frames" and "no frames" buttons below the top navigation bar can be used to control whether the table of contents is displayed or not.

The Navigation Bar

A navigation bar is located at the top and bottom of every page. It indicates what type of page you are currently viewing, and allows you to go to related pages. The following table describes the labels on the navigation bar. Note that not some labels (such as [Parent]) are not displayed on all pages.

Label Highlighted when... Links to...
[Parent] (never highlighted) the parent of the current package
[Package] viewing a package the package containing the current object
[Module] viewing a module the module containing the current object
[Class] viewing a class the class containing the current object
[Trees] viewing the trees page the trees page
[Index] viewing the index page the index page
[Help] viewing the help page the help page

The "show private" and "hide private" buttons below the top navigation bar can be used to control whether documentation for private objects is displayed. Private objects are usually defined as objects whose (short) names begin with a single underscore, but do not end with an underscore. For example, "_x", "__pprint", and "epydoc.epytext._tokenize" are private objects; but "re.sub", "__init__", and "type_" are not. However, if a module defines the "__all__" variable, then its contents are used to decide which objects are private.

A timestamp below the bottom navigation bar indicates when each page was last updated.

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Identifier Index

 [ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z _ ]

A
addCondition()
(in ParserElement)		 And
(in pyparsing)		 asDict()
(in ParseResults)
addParseAction()
(in ParserElement)		 anyCloseTag
(in pyparsing)		 asList()
(in ParseResults)
alphanums
(in pyparsing)		 anyOpenTag
(in pyparsing)		 asXML()
(in ParseResults)
alphas
(in pyparsing)		 append()
(in ParseExpression)		  
alphas8bit
(in pyparsing)		 append()
(in ParseResults)		  

C
canParseNext()
(in ParserElement)		 clear()
(in ParseResults)		 convertToFloat()
(in pyparsing_common)
CaselessKeyword
(in pyparsing)		 CloseMatch
(in pyparsing)		 convertToInteger()
(in pyparsing_common)
CaselessLiteral
(in pyparsing)		 col()
(in pyparsing)		 copy()
(in Forward)
CharsNotIn
(in pyparsing)		 Combine
(in pyparsing)		 copy()
(in Keyword)
checkRecursion()
(in And)		 comma_separated_list
(in pyparsing_common)		 copy()
(in ParseExpression)
checkRecursion()
(in Each)		 commaSeparatedList
(in pyparsing)		 copy()
(in ParseResults)
checkRecursion()
(in MatchFirst)		 commonHTMLEntity
(in pyparsing)		 copy()
(in ParserElement)
checkRecursion()
(in Or)		 compiledREtype
(in Regex)		 countedArray()
(in pyparsing)
checkRecursion()
(in ParseElementEnhance)		 convertToDate()
(in pyparsing_common)		 cppStyleComment
(in pyparsing)
checkRecursion()
(in ParserElement)		 convertToDatetime()
(in pyparsing_common)		 cStyleComment
(in pyparsing)

D
dblQuotedString
(in pyparsing)		 delimitedList()
(in pyparsing)		 downcaseTokens()
(in pyparsing_common)
dblSlashComment
(in pyparsing)		 Dict
(in pyparsing)		 dump()
(in ParseResults)
DEFAULT_KEYWORD_CHARS
(in Keyword)		 dictOf()
(in pyparsing)		  
DEFAULT_WHITE_CHARS
(in ParserElement)		 downcaseTokens()
(in pyparsing)		  

E
Each
(in pyparsing)		 empty
(in pyparsing)		 extend()
(in ParseResults)
Empty
(in pyparsing)		 enablePackrat()
(in ParserElement)		  

F
findall()
(in compiledREtype)		 fname
(in pyparsing)		 Forward
(in pyparsing)
finditer()
(in compiledREtype)		 fnumber
(in pyparsing_common)		 fraction
(in pyparsing_common)
flags
(in compiledREtype)		 FollowedBy
(in pyparsing)		  

G
get()
(in ParseResults)		 GoToColumn
(in pyparsing)		 groupindex
(in compiledREtype)
getName()
(in ParseResults)		 Group
(in pyparsing)		 groups
(in compiledREtype)

H
haskeys()
(in ParseResults)		 hexnums
(in pyparsing)		  
hex_integer
(in pyparsing_common)		 htmlComment
(in pyparsing)		  

I
identifier
(in pyparsing_common)		 indentedBlock()
(in pyparsing)		 ipv4_address
(in pyparsing_common)
ignore()
(in Combine)		 infixNotation()
(in pyparsing)		 ipv6_address
(in pyparsing_common)
ignore()
(in ParseElementEnhance)		 inlineLiteralsUsing()
(in ParserElement)		 iso8601_date
(in pyparsing_common)
ignore()
(in ParseExpression)		 insert()
(in ParseResults)		 iso8601_datetime
(in pyparsing_common)
ignore()
(in ParserElement)		 integer
(in pyparsing_common)		 items()
(in ParseResults)

J
javaStyleComment
(in pyparsing)		    
   

K
keys()
(in ParseResults)		 Keyword
(in pyparsing)		  
   

L
leaveWhitespace()
(in Forward)		 line()
(in pyparsing)		 LineStart
(in pyparsing)
leaveWhitespace()
(in ParseElementEnhance)		 LineEnd
(in pyparsing)		 lineStart
(in pyparsing)
leaveWhitespace()
(in ParseExpression)		 lineEnd
(in pyparsing)		 Literal
(in pyparsing)
leaveWhitespace()
(in ParserElement)		 lineno()
(in pyparsing)		 locatedExpr()
(in pyparsing)

M
mac_address
(in pyparsing_common)		 match()
(in compiledREtype)		 matchPreviousExpr()
(in pyparsing)
makeHTMLTags()
(in pyparsing)		 matches()
(in ParserElement)		 matchPreviousLiteral()
(in pyparsing)
makeXMLTags()
(in pyparsing)		 MatchFirst
(in pyparsing)		 mixed_integer
(in pyparsing_common)
markInputline()
(in ParseBaseException)		 matchOnlyAtCol()
(in pyparsing)		  

N
nestedExpr()
(in pyparsing)		 NotAny
(in pyparsing)		 number
(in pyparsing_common)
NoMatch
(in pyparsing)		 nullDebugAction()
(in pyparsing)		 nums
(in pyparsing)

O
oneOf()
(in pyparsing)		 opAssoc
(in pyparsing)		 originalTextFor()
(in pyparsing)
OneOrMore
(in pyparsing)		 Optional
(in pyparsing)		  
OnlyOnce
(in pyparsing)		 Or
(in pyparsing)		  

P
packrat_cache
(in ParserElement)		 parseImpl()
(in Literal)		 parseString()
(in ParserElement)
packrat_cache_lock
(in ParserElement)		 parseImpl()
(in MatchFirst)		 ParseSyntaxException
(in pyparsing)
packrat_cache_stats
(in ParserElement)		 parseImpl()
(in NoMatch)		 parseWithTabs()
(in ParserElement)
ParseBaseException
(in pyparsing)		 parseImpl()
(in NotAny)		 pattern
(in compiledREtype)
ParseElementEnhance
(in pyparsing)		 parseImpl()
(in Optional)		 pop()
(in ParseResults)
ParseException
(in pyparsing)		 parseImpl()
(in Or)		 postParse()
(in Combine)
ParseExpression
(in pyparsing)		 parseImpl()
(in ParseElementEnhance)		 postParse()
(in Dict)
ParseFatalException
(in pyparsing)		 parseImpl()
(in ParserElement)		 postParse()
(in Group)
parseFile()
(in ParserElement)		 parseImpl()
(in QuotedString)		 postParse()
(in ParserElement)
parseImpl()
(in And)		 parseImpl()
(in Regex)		 postParse()
(in Suppress)
parseImpl()
(in CaselessKeyword)		 parseImpl()
(in SkipTo)		 pprint()
(in ParseResults)
parseImpl()
(in CaselessLiteral)		 parseImpl()
(in StringEnd)		 preParse()
(in GoToColumn)
parseImpl()
(in CharsNotIn)		 parseImpl()
(in StringStart)		 preParse()
(in ParserElement)
parseImpl()
(in CloseMatch)		 parseImpl()
(in White)		 printables
(in pyparsing)
parseImpl()
(in Each)		 parseImpl()
(in Word)		 punc8bit
(in pyparsing)
parseImpl()
(in FollowedBy)		 parseImpl()
(in WordEnd)		 PY_3
(in pyparsing)
parseImpl()
(in GoToColumn)		 parseImpl()
(in WordStart)		 pyparsing
parseImpl()
(in Keyword)		 parseImpl()
(in ZeroOrMore)		 pyparsing_common
(in pyparsing)
parseImpl()
(in LineEnd)		 ParserElement
(in pyparsing)		 pythonStyleComment
(in pyparsing)
parseImpl()
(in LineStart)		 ParseResults
(in pyparsing)		  

Q
QuotedString
(in pyparsing)		 quotedString
(in pyparsing)		  
   

R
real
(in pyparsing_common)		 replaceHTMLEntity()
(in pyparsing)		 restOfLine
(in pyparsing)
RecursiveGrammarException
(in pyparsing)		 replaceWith()
(in pyparsing)		 runTests()
(in ParserElement)
Regex
(in pyparsing)		 reset()
(in OnlyOnce)		  
removeQuotes()
(in pyparsing)		 resetCache()
(in ParserElement)		  

S
scanner()
(in compiledREtype)		 setResultsName()
(in ParseExpression)		 streamline()
(in ParserElement)
scanString()
(in ParserElement)		 setResultsName()
(in ParserElement)		 StringEnd
(in pyparsing)
sci_real
(in pyparsing_common)		 setWhitespaceChars()
(in ParserElement)		 stringEnd
(in pyparsing)
search()
(in compiledREtype)		 sglQuotedString
(in pyparsing)		 StringStart
(in pyparsing)
searchString()
(in ParserElement)		 signed_integer
(in pyparsing_common)		 stringStart
(in pyparsing)
setBreak()
(in ParserElement)		 singleArgBuiltins
(in pyparsing)		 stripHTMLTags()
(in pyparsing_common)
setDebug()
(in ParserElement)		 SkipTo
(in pyparsing)		 sub()
(in compiledREtype)
setDebugActions()
(in ParserElement)		 split()
(in ParserElement)		 subn()
(in compiledREtype)
setDefaultKeywordChars()
(in Keyword)		 split()
(in compiledREtype)		 Suppress
(in pyparsing)
setDefaultWhitespaceChars()
(in ParserElement)		 srange()
(in pyparsing)		 suppress()
(in ParserElement)
setFailAction()
(in ParserElement)		 streamline()
(in Forward)		 suppress()
(in Suppress)
setName()
(in ParserElement)		 streamline()
(in ParseElementEnhance)		 system_version
(in pyparsing)
setParseAction()
(in ParserElement)		 streamline()
(in ParseExpression)		  

T
Token
(in pyparsing)		 tokenMap()
(in pyparsing)		 transformString()
(in ParserElement)
TokenConverter
(in pyparsing)		 traceParseAction()
(in pyparsing)		 tryParse()
(in ParserElement)

U
ungroup()
(in pyparsing)		 upcaseTokens()
(in pyparsing_common)		 uuid
(in pyparsing_common)
unicodeString
(in pyparsing)		 upcaseTokens()
(in pyparsing)		  

V
validate()
(in Forward)		 validate()
(in ParseExpression)		 values()
(in ParseResults)
validate()
(in ParseElementEnhance)		 validate()
(in ParserElement)		 verbose_stacktrace
(in ParserElement)

W
White
(in pyparsing)		 withClass()
(in pyparsing)		 WordStart
(in pyparsing)
whiteStrs
(in White)		 Word
(in pyparsing)		  
withAttribute()
(in pyparsing)		 WordEnd
(in pyparsing)		  

Z
ZeroOrMore
(in pyparsing)		    
   

_
__add__()
(in ParseResults)		 __init__()
(in ParseResults)		 __slotnames__
(in Optional)
__add__()
(in ParserElement)		 __init__()
(in ParserElement)		 __slotnames__
(in Regex)
__and__()
(in ParserElement)		 __init__()
(in QuotedString)		 __slotnames__
(in Suppress)
__bool__()
(in ParseResults)		 __init__()
(in RecursiveGrammarException)		 __slotnames__
(in White)
__call__()
(in OnlyOnce)		 __init__()
(in Regex)		 __slotnames__
(in Word)
__call__()
(in ParserElement)		 __init__()
(in SkipTo)		 __str__()
(in And)
__contains__()
(in ParseResults)		 __init__()
(in StringEnd)		 __str__()
(in CharsNotIn)
__copy__()
(in compiledREtype)		 __init__()
(in StringStart)		 __str__()
(in Each)
__deepcopy__()
(in compiledREtype)		 __init__()
(in Token)		 __str__()
(in Forward)
__delitem__()
(in ParseResults)		 __init__()
(in TokenConverter)		 __str__()
(in MatchFirst)
__dir__()
(in ParseBaseException)		 __init__()
(in White)		 __str__()
(in NotAny)
__dir__()
(in ParseResults)		 __init__()
(in Word)		 __str__()
(in OneOrMore)
__doc__
(in pyparsing)		 __init__()
(in WordEnd)		 __str__()
(in Optional)
__eq__()
(in ParserElement)		 __init__()
(in WordStart)		 __str__()
(in Or)
__getattr__()
(in ParseBaseException)		 __init__()
(in ZeroOrMore)		 __str__()
(in ParseBaseException)
__getattr__()
(in ParseResults)		 __invert__()
(in ParserElement)		 __str__()
(in ParseElementEnhance)
__getitem__()
(in ParseExpression)		 __ior__()
(in MatchFirst)		 __str__()
(in ParseExpression)
__getitem__()
(in ParseResults)		 __iter__()
(in ParseResults)		 __str__()
(in ParseResults)
__getnewargs__()
(in ParseResults)		 __ixor__()
(in Or)		 __str__()
(in ParserElement)
__getstate__()
(in ParseResults)		 __len__()
(in ParseResults)		 __str__()
(in QuotedString)
__hash__()
(in ParserElement)		 __lshift__()
(in Forward)		 __str__()
(in RecursiveGrammarException)
__iadd__()
(in And)		 __mul__()
(in ParserElement)		 __str__()
(in Regex)
__iadd__()
(in ParseResults)		 __ne__()
(in ParserElement)		 __str__()
(in Word)
__ilshift__()
(in Forward)		 __new__()
(in ParseResults)		 __str__()
(in ZeroOrMore)
__init__()
(in And)		 __or__()
(in ParserElement)		 __sub__()
(in ParserElement)
__init__()
(in CaselessKeyword)		 __package__
(in pyparsing)		 __versionTime__
(in pyparsing)
__init__()
(in CaselessLiteral)		 __radd__()
(in ParseResults)		 __xor__()
(in ParserElement)
__init__()
(in CharsNotIn)		 __radd__()
(in ParserElement)		 _bslash
(in pyparsing)
__init__()
(in CloseMatch)		 __rand__()
(in ParserElement)		 _charRange
(in pyparsing)
__init__()
(in Combine)		 __repr__()
(in ParseBaseException)		 _commasepitem
(in pyparsing)
__init__()
(in Dict)		 __repr__()
(in ParseResults)		 _commasepitem
(in pyparsing_common)
__init__()
(in Each)		 __repr__()
(in ParserElement)		 _escapedHexChar
(in pyparsing)
__init__()
(in Empty)		 __req__()
(in ParserElement)		 _escapedOctChar
(in pyparsing)
__init__()
(in FollowedBy)		 __reversed__()
(in ParseResults)		 _escapedPunc
(in pyparsing)
__init__()
(in Forward)		 __rmul__()
(in ParserElement)		 _full_ipv6_address
(in pyparsing_common)
__init__()
(in GoToColumn)		 __rne__()
(in ParserElement)		 _html_stripper
(in pyparsing_common)
__init__()
(in Group)		 __ror__()
(in ParserElement)		 _htmlEntityMap
(in pyparsing)
__init__()
(in Keyword)		 __rsub__()
(in ParserElement)		 _ipv6_part
(in pyparsing_common)
__init__()
(in LineEnd)		 __rxor__()
(in ParserElement)		 _iteritems()
(in ParseResults)
__init__()
(in LineStart)		 __setitem__()
(in ParseResults)		 _iterkeys()
(in ParseResults)
__init__()
(in Literal)		 __setstate__()
(in ParseResults)		 _itervalues()
(in ParseResults)
__init__()
(in MatchFirst)		 __slotnames__
(in And)		 _MAX_INT
(in pyparsing)
__init__()
(in NoMatch)		 __slotnames__
(in Combine)		 _mixed_ipv6_address
(in pyparsing_common)
__init__()
(in NotAny)		 __slotnames__
(in Dict)		 _optionalNotMatched
(in pyparsing)
__init__()
(in OnlyOnce)		 __slotnames__
(in Group)		 _packratEnabled
(in ParserElement)
__init__()
(in Optional)		 __slotnames__
(in LineEnd)		 _reBracketExpr
(in pyparsing)
__init__()
(in Or)		 __slotnames__
(in Literal)		 _short_ipv6_address
(in pyparsing_common)
__init__()
(in ParseBaseException)		 __slotnames__
(in MatchFirst)		 _singleChar
(in pyparsing)
__init__()
(in ParseElementEnhance)		 __slotnames__
(in NotAny)		  
__init__()
(in ParseExpression)		 __slotnames__
(in OneOrMore)		  


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Module pyparsing

source code

pyparsing module - Classes and methods to define and execute parsing grammars

The pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. With pyparsing, you don't need to learn a new syntax for defining grammars or matching expressions - the parsing module provides a library of classes that you use to construct the grammar directly in Python.

Here is a program to parse "Hello, World!" (or any greeting of the form "<salutation>, <addressee>!"), built up using Word, Literal, and And elements ('+' operator gives And expressions, strings are auto-converted to Literal expressions):

   from pyparsing import Word, alphas

   # define grammar of a greeting
   greet = Word(alphas) + "," + Word(alphas) + "!"

   hello = "Hello, World!"
   print (hello, "->", greet.parseString(hello))

The program outputs the following:

   Hello, World! -> ['Hello', ',', 'World', '!']

The Python representation of the grammar is quite readable, owing to the self-explanatory class names, and the use of '+', '|' and '^' operators.

The ParseResults object returned from ParserElement.parseString can be accessed as a nested list, a dictionary, or an object with named attributes.

The pyparsing module handles some of the problems that are typically vexing when writing text parsers:

  • extra or missing whitespace (the above program will also handle "Hello,World!", "Hello , World !", etc.)
  • quoted strings
  • embedded comments

Version: 2.1.10

Author: Paul McGuire <ptmcg@users.sourceforge.net>

Classes
  ParseBaseException
base exception class for all parsing runtime exceptions
  ParseException
Exception thrown when parse expressions don't match class; supported attributes by name are:
  ParseFatalException
user-throwable exception thrown when inconsistent parse content is found; stops all parsing immediately
  ParseSyntaxException
just like ParseFatalException, but thrown internally when an ErrorStop ('-' operator) indicates that parsing is to stop immediately because an unbacktrackable syntax error has been found
  RecursiveGrammarException
exception thrown by ParserElement.validate if the grammar could be improperly recursive
  ParseResults
Structured parse results, to provide multiple means of access to the parsed data:
  ParserElement
Abstract base level parser element class.
  Token
Abstract ParserElement subclass, for defining atomic matching patterns.
  Empty
An empty token, will always match.
  NoMatch
A token that will never match.
  Literal
Token to exactly match a specified string.
  Keyword
Token to exactly match a specified string as a keyword, that is, it must be immediately followed by a non-keyword character.
  CaselessLiteral
Token to match a specified string, ignoring case of letters.
  CaselessKeyword
Caseless version of Keyword.
  CloseMatch
A variation on Literal which matches "close" matches, that is, strings with at most 'n' mismatching characters.
  Word
Token for matching words composed of allowed character sets.
  Regex
Token for matching strings that match a given regular expression.
  QuotedString
Token for matching strings that are delimited by quoting characters.
  CharsNotIn
Token for matching words composed of characters not in a given set (will include whitespace in matched characters if not listed in the provided exclusion set - see example).
  White
Special matching class for matching whitespace.
  GoToColumn
Token to advance to a specific column of input text; useful for tabular report scraping.
  LineStart
Matches if current position is at the beginning of a line within the parse string
  LineEnd
Matches if current position is at the end of a line within the parse string
  StringStart
Matches if current position is at the beginning of the parse string
  StringEnd
Matches if current position is at the end of the parse string
  WordStart
Matches if the current position is at the beginning of a Word, and is not preceded by any character in a given set of wordChars (default=printables).
  WordEnd
Matches if the current position is at the end of a Word, and is not followed by any character in a given set of wordChars (default=printables).
  ParseExpression
Abstract subclass of ParserElement, for combining and post-processing parsed tokens.
  And
Requires all given ParseExpressions to be found in the given order.
  Or
Requires that at least one ParseExpression is found.
  MatchFirst
Requires that at least one ParseExpression is found.
  Each
Requires all given ParseExpressions to be found, but in any order.
  ParseElementEnhance
Abstract subclass of ParserElement, for combining and post-processing parsed tokens.
  FollowedBy
Lookahead matching of the given parse expression.
  NotAny
Lookahead to disallow matching with the given parse expression.
  OneOrMore
Repetition of one or more of the given expression.
  ZeroOrMore
Optional repetition of zero or more of the given expression.
  Optional
Optional matching of the given expression.
  SkipTo
Token for skipping over all undefined text until the matched expression is found.
  Forward
Forward declaration of an expression to be defined later - used for recursive grammars, such as algebraic infix notation.
  TokenConverter
Abstract subclass of ParseExpression, for converting parsed results.
  Combine
Converter to concatenate all matching tokens to a single string.
  Group
Converter to return the matched tokens as a list - useful for returning tokens of ZeroOrMore and OneOrMore expressions.
  Dict
Converter to return a repetitive expression as a list, but also as a dictionary.
  Suppress
Converter for ignoring the results of a parsed expression.
  OnlyOnce
Wrapper for parse actions, to ensure they are only called once.
  pyparsing_common
Here are some common low-level expressions that may be useful in jump-starting parser development:
Functions
 
col(loc, strg)
Returns current column within a string, counting newlines as line separators.		 source code
 
lineno(loc, strg)
Returns current line number within a string, counting newlines as line separators.		 source code
 
line(loc, strg)
Returns the line of text containing loc within a string, counting newlines as line separators.		 source code
 
nullDebugAction(*args)
'Do-nothing' debug action, to suppress debugging output during parsing.		 source code
 
traceParseAction(f)
Decorator for debugging parse actions.		 source code
 
delimitedList(expr, delim=',', combine=False)
Helper to define a delimited list of expressions - the delimiter defaults to ','.		 source code
 
countedArray(expr, intExpr=None)
Helper to define a counted list of expressions.		 source code
 
matchPreviousLiteral(expr)
Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression.		 source code
 
matchPreviousExpr(expr)
Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression.		 source code
 
oneOf(strs, caseless=False, useRegex=True)
Helper to quickly define a set of alternative Literals, and makes sure to do longest-first testing when there is a conflict, regardless of the input order, but returns a MatchFirst for best performance.		 source code
 
dictOf(key, value)
Helper to easily and clearly define a dictionary by specifying the respective patterns for the key and value.		 source code
 
originalTextFor(expr, asString=True)
Helper to return the original, untokenized text for a given expression.		 source code
 
ungroup(expr)
Helper to undo pyparsing's default grouping of And expressions, even if all but one are non-empty.		 source code
 
locatedExpr(expr)
Helper to decorate a returned token with its starting and ending locations in the input string.		 source code
 
srange(s)
Helper to easily define string ranges for use in Word construction.		 source code
 
matchOnlyAtCol(n)
Helper method for defining parse actions that require matching at a specific column in the input text.		 source code
 
replaceWith(replStr)
Helper method for common parse actions that simply return a literal value.		 source code
 
removeQuotes(s, l, t)
Helper parse action for removing quotation marks from parsed quoted strings.		 source code
 
tokenMap(func, *args)
Helper to define a parse action by mapping a function to all elements of a ParseResults list.If any additional args are passed, they are forwarded to the given function as additional arguments after the token, as in hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16)), which will convert the parsed data to an integer using base 16.		 source code
 
upcaseTokens(s, l, t)
(Deprecated) Helper parse action to convert tokens to upper case.		 source code
 
downcaseTokens(s, l, t)
(Deprecated) Helper parse action to convert tokens to lower case.		 source code
 
makeHTMLTags(tagStr)
Helper to construct opening and closing tag expressions for HTML, given a tag name.		 source code
 
makeXMLTags(tagStr)
Helper to construct opening and closing tag expressions for XML, given a tag name.		 source code
 
withAttribute(*args, **attrDict)
Helper to create a validating parse action to be used with start tags created with makeXMLTags or makeHTMLTags.		 source code
 
withClass(classname, namespace='')
Simplified version of withAttribute when matching on a div class - made difficult because class is a reserved word in Python.		 source code
 
infixNotation(baseExpr, opList, lpar=Suppress:("("), rpar=Suppress:(")"))
Helper method for constructing grammars of expressions made up of operators working in a precedence hierarchy.		 source code
 
operatorPrecedence(baseExpr, opList, lpar=Suppress:("("), rpar=Suppress:(")"))
(Deprecated) Former name of infixNotation, will be dropped in a future release.		 source code
 
nestedExpr(opener='(', closer=')', content=None, ignoreExpr=quotedString using single or double quotes)
Helper method for defining nested lists enclosed in opening and closing delimiters ("(" and ")" are the default).		 source code
 
indentedBlock(blockStatementExpr, indentStack, indent=True)
Helper method for defining space-delimited indentation blocks, such as those used to define block statements in Python source code.		 source code
 
replaceHTMLEntity(t)
Helper parser action to replace common HTML entities with their special characters		 source code
Variables
  alphas = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
  nums = '0123456789'
  hexnums = '0123456789ABCDEFabcdef'
  alphanums = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvw...
  printables = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKL...
  empty = empty
  lineStart = lineStart
  lineEnd = lineEnd
  stringStart = stringStart
  stringEnd = stringEnd
  opAssoc = _Constants()
  dblQuotedString = string enclosed in double quotes
  sglQuotedString = string enclosed in single quotes
  quotedString = quotedString using single or double quotes
  unicodeString = unicode string literal
  alphas8bit = u'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîï...
  punc8bit = u'¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿×÷'
  commonHTMLEntity = common HTML entity
  cStyleComment = C style comment
Comment of the form /* ... */
  htmlComment = HTML comment
Comment of the form <!-- ... -->
  restOfLine = rest of line
  dblSlashComment = // comment
Comment of the form // ... (to end of line)
  cppStyleComment = C++ style comment
Comment of either form cStyleComment or dblSlashComment
  javaStyleComment = C++ style comment
Same as cppStyleComment
  pythonStyleComment = Python style comment
Comment of the form # ... (to end of line)
  commaSeparatedList = commaSeparatedList
(Deprecated) Predefined expression of 1 or more printable words or quoted strings, separated by commas.
  anyCloseTag = </any tag>
  anyOpenTag = <any tag>
Function Details

col(loc, strg)

source code 

Returns current column within a string, counting newlines as line separators. The first column is number 1.

Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See ParserElement.parseString for more information on parsing strings containing <TAB>s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string.

lineno(loc, strg)

source code 

Returns current line number within a string, counting newlines as line separators. The first line is number 1.

Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See ParserElement.parseString for more information on parsing strings containing <TAB>s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string.

traceParseAction(f)

source code 

Decorator for debugging parse actions.

When the parse action is called, this decorator will print ">> entering method-name(line:current_source_line, parse_location, matched_tokens)". When the parse action completes, the decorator will print "<<" followed by the returned value, or any exception that the parse action raised.

Example:

   wd = Word(alphas)

   @traceParseAction
   def remove_duplicate_chars(tokens):
       return ''.join(sorted(set(''.join(tokens)))

   wds = OneOrMore(wd).setParseAction(remove_duplicate_chars)
   print(wds.parseString("slkdjs sld sldd sdlf sdljf"))

prints:

   >>entering remove_duplicate_chars(line: 'slkdjs sld sldd sdlf sdljf', 0, (['slkdjs', 'sld', 'sldd', 'sdlf', 'sdljf'], {}))
   <<leaving remove_duplicate_chars (ret: 'dfjkls')
   ['dfjkls']

delimitedList(expr, delim=',', combine=False)

source code 

Helper to define a delimited list of expressions - the delimiter defaults to ','. By default, the list elements and delimiters can have intervening whitespace, and comments, but this can be overridden by passing combine=True in the constructor. If combine is set to True, the matching tokens are returned as a single token string, with the delimiters included; otherwise, the matching tokens are returned as a list of tokens, with the delimiters suppressed.

Example:

   delimitedList(Word(alphas)).parseString("aa,bb,cc") # -> ['aa', 'bb', 'cc']
   delimitedList(Word(hexnums), delim=':', combine=True).parseString("AA:BB:CC:DD:EE") # -> ['AA:BB:CC:DD:EE']

countedArray(expr, intExpr=None)

source code 

Helper to define a counted list of expressions. This helper defines a pattern of the form:

   integer expr expr expr...

where the leading integer tells how many expr expressions follow. The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed.

If intExpr is specified, it should be a pyparsing expression that produces an integer value.

Example:

   countedArray(Word(alphas)).parseString('2 ab cd ef')  # -> ['ab', 'cd']

   # in this parser, the leading integer value is given in binary,
   # '10' indicating that 2 values are in the array
   binaryConstant = Word('01').setParseAction(lambda t: int(t[0], 2))
   countedArray(Word(alphas), intExpr=binaryConstant).parseString('10 ab cd ef')  # -> ['ab', 'cd']

matchPreviousLiteral(expr)

source code 

Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression. For example:

   first = Word(nums)
   second = matchPreviousLiteral(first)
   matchExpr = first + ":" + second

will match "1:1", but not "1:2". Because this matches a previous literal, will also match the leading "1:1" in "1:10". If this is not desired, use matchPreviousExpr. Do not use with packrat parsing enabled.

matchPreviousExpr(expr)

source code 

Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression. For example:

   first = Word(nums)
   second = matchPreviousExpr(first)
   matchExpr = first + ":" + second

will match "1:1", but not "1:2". Because this matches by expressions, will not match the leading "1:1" in "1:10"; the expressions are evaluated first, and then compared, so "1" is compared with "10". Do not use with packrat parsing enabled.

oneOf(strs, caseless=False, useRegex=True)

source code 

Helper to quickly define a set of alternative Literals, and makes sure to do longest-first testing when there is a conflict, regardless of the input order, but returns a MatchFirst for best performance.

Parameters:

  • strs - a string of space-delimited literals, or a collection of string literals
  • caseless - (default=False) - treat all literals as caseless
  • useRegex - (default=True) - as an optimization, will generate a Regex object; otherwise, will generate a MatchFirst object (if caseless=True, or if creating a Regex raises an exception)

Example:

   comp_oper = oneOf("< = > <= >= !=")
   var = Word(alphas)
   number = Word(nums)
   term = var | number
   comparison_expr = term + comp_oper + term
   print(comparison_expr.searchString("B = 12  AA=23 B<=AA AA>12"))

prints:

   [['B', '=', '12'], ['AA', '=', '23'], ['B', '<=', 'AA'], ['AA', '>', '12']]

dictOf(key, value)

source code 

Helper to easily and clearly define a dictionary by specifying the respective patterns for the key and value. Takes care of defining the Dict, ZeroOrMore, and Group tokens in the proper order. The key pattern can include delimiting markers or punctuation, as long as they are suppressed, thereby leaving the significant key text. The value pattern can include named results, so that the Dict results can include named token fields.

Example:

   text = "shape: SQUARE posn: upper left color: light blue texture: burlap"
   attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
   print(OneOrMore(attr_expr).parseString(text).dump())
   
   attr_label = label
   attr_value = Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)

   # similar to Dict, but simpler call format
   result = dictOf(attr_label, attr_value).parseString(text)
   print(result.dump())
   print(result['shape'])
   print(result.shape)  # object attribute access works too
   print(result.asDict())

prints:

   [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']]
   - color: light blue
   - posn: upper left
   - shape: SQUARE
   - texture: burlap
   SQUARE
   SQUARE
   {'color': 'light blue', 'shape': 'SQUARE', 'posn': 'upper left', 'texture': 'burlap'}

originalTextFor(expr, asString=True)

source code 

Helper to return the original, untokenized text for a given expression. Useful to restore the parsed fields of an HTML start tag into the raw tag text itself, or to revert separate tokens with intervening whitespace back to the original matching input text. By default, returns astring containing the original parsed text.

If the optional asString argument is passed as False, then the return value is a ParseResults containing any results names that were originally matched, and a single token containing the original matched text from the input string. So if the expression passed to originalTextFor contains expressions with defined results names, you must set asString to False if you want to preserve those results name values.

Example:

   src = "this is test <b> bold <i>text</i> </b> normal text "
   for tag in ("b","i"):
       opener,closer = makeHTMLTags(tag)
       patt = originalTextFor(opener + SkipTo(closer) + closer)
       print(patt.searchString(src)[0])

prints:

   ['<b> bold <i>text</i> </b>']
   ['<i>text</i>']

locatedExpr(expr)

source code 

Helper to decorate a returned token with its starting and ending locations in the input string. This helper adds the following results names:

  • locn_start = location where matched expression begins
  • locn_end = location where matched expression ends
  • value = the actual parsed results

Be careful if the input text contains <TAB> characters, you may want to call ParserElement.parseWithTabs

Example:

   wd = Word(alphas)
   for match in locatedExpr(wd).searchString("ljsdf123lksdjjf123lkkjj1222"):
       print(match)

prints:

   [[0, 'ljsdf', 5]]
   [[8, 'lksdjjf', 15]]
   [[18, 'lkkjj', 23]]

srange(s)

source code 

Helper to easily define string ranges for use in Word construction. Borrows syntax from regexp '[]' string range definitions:

   srange("[0-9]")   -> "0123456789"
   srange("[a-z]")   -> "abcdefghijklmnopqrstuvwxyz"
   srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_"

The input string must be enclosed in []'s, and the returned string is the expanded character set joined into a single string. The values enclosed in the []'s may be:

  • a single character
  • an escaped character with a leading backslash (such as \- or \])
  • an escaped hex character with a leading '\x' (\x21, which is a '!' character) (\0x## is also supported for backwards compatibility)
  • an escaped octal character with a leading '\0' (\041, which is a '!' character)
  • a range of any of the above, separated by a dash ('a-z', etc.)
  • any combination of the above ('aeiouy', 'a-zA-Z0-9_$', etc.)

replaceWith(replStr)

source code 

Helper method for common parse actions that simply return a literal value. Especially useful when used with transformString().

Example:

   num = Word(nums).setParseAction(lambda toks: int(toks[0]))
   na = oneOf("N/A NA").setParseAction(replaceWith(math.nan))
   term = na | num
   
   OneOrMore(term).parseString("324 234 N/A 234") # -> [324, 234, nan, 234]

removeQuotes(s, l, t)

source code 

Helper parse action for removing quotation marks from parsed quoted strings.

Example:

   # by default, quotation marks are included in parsed results
   quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["'Now is the Winter of our Discontent'"]

   # use removeQuotes to strip quotation marks from parsed results
   quotedString.setParseAction(removeQuotes)
   quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["Now is the Winter of our Discontent"]

tokenMap(func, *args)

source code 

Helper to define a parse action by mapping a function to all elements of a ParseResults list.If any additional args are passed, they are forwarded to the given function as additional arguments after the token, as in hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16)), which will convert the parsed data to an integer using base 16.

Example (compare the last to example in ParserElement.transformString:

   hex_ints = OneOrMore(Word(hexnums)).setParseAction(tokenMap(int, 16))
   hex_ints.runTests('''
       00 11 22 aa FF 0a 0d 1a
       ''')
   
   upperword = Word(alphas).setParseAction(tokenMap(str.upper))
   OneOrMore(upperword).runTests('''
       my kingdom for a horse
       ''')

   wd = Word(alphas).setParseAction(tokenMap(str.title))
   OneOrMore(wd).setParseAction(' '.join).runTests('''
       now is the winter of our discontent made glorious summer by this sun of york
       ''')

prints:

   00 11 22 aa FF 0a 0d 1a
   [0, 17, 34, 170, 255, 10, 13, 26]

   my kingdom for a horse
   ['MY', 'KINGDOM', 'FOR', 'A', 'HORSE']

   now is the winter of our discontent made glorious summer by this sun of york
   ['Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York']

upcaseTokens(s, l, t)

source code 

(Deprecated) Helper parse action to convert tokens to upper case. Deprecated in favor of pyparsing_common.upcaseTokens

downcaseTokens(s, l, t)

source code 

(Deprecated) Helper parse action to convert tokens to lower case. Deprecated in favor of pyparsing_common.downcaseTokens

makeHTMLTags(tagStr)

source code 

Helper to construct opening and closing tag expressions for HTML, given a tag name. Matches tags in either upper or lower case, attributes with namespaces and with quoted or unquoted values.

Example:

   text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>'
   # makeHTMLTags returns pyparsing expressions for the opening and closing tags as a 2-tuple
   a,a_end = makeHTMLTags("A")
   link_expr = a + SkipTo(a_end)("link_text") + a_end
   
   for link in link_expr.searchString(text):
       # attributes in the <A> tag (like "href" shown here) are also accessible as named results
       print(link.link_text, '->', link.href)

prints:

   pyparsing -> http://pyparsing.wikispaces.com

makeXMLTags(tagStr)

source code 

Helper to construct opening and closing tag expressions for XML, given a tag name. Matches tags only in the given upper/lower case.

Example: similar to makeHTMLTags

withAttribute(*args, **attrDict)

source code 

Helper to create a validating parse action to be used with start tags created with makeXMLTags or makeHTMLTags. Use withAttribute to qualify a starting tag with a required attribute value, to avoid false matches on common tags such as <TD> or <DIV>.

Call withAttribute with a series of attribute names and values. Specify the list of filter attributes names and values as:

  • keyword arguments, as in (align="right"), or
  • as an explicit dict with ** operator, when an attribute name is also a Python reserved word, as in **{"class":"Customer", "align":"right"}
  • a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") )

For attribute names with a namespace prefix, you must use the second form. Attribute names are matched insensitive to upper/lower case.

If just testing for class (with or without a namespace), use withClass.

To verify that the attribute exists, but without specifying a value, pass withAttribute.ANY_VALUE as the value.

Example:

   html = '''
       <div>
       Some text
       <div type="grid">1 4 0 1 0</div>
       <div type="graph">1,3 2,3 1,1</div>
       <div>this has no type</div>
       </div>
           
   '''
   div,div_end = makeHTMLTags("div")

   # only match div tag having a type attribute with value "grid"
   div_grid = div().setParseAction(withAttribute(type="grid"))
   grid_expr = div_grid + SkipTo(div | div_end)("body")
   for grid_header in grid_expr.searchString(html):
       print(grid_header.body)
   
   # construct a match with any div tag having a type attribute, regardless of the value
   div_any_type = div().setParseAction(withAttribute(type=withAttribute.ANY_VALUE))
   div_expr = div_any_type + SkipTo(div | div_end)("body")
   for div_header in div_expr.searchString(html):
       print(div_header.body)

prints:

   1 4 0 1 0

   1 4 0 1 0
   1,3 2,3 1,1

withClass(classname, namespace='')

source code 

Simplified version of withAttribute when matching on a div class - made difficult because class is a reserved word in Python.

Example:

   html = '''
       <div>
       Some text
       <div class="grid">1 4 0 1 0</div>
       <div class="graph">1,3 2,3 1,1</div>
       <div>this &lt;div&gt; has no class</div>
       </div>
           
   '''
   div,div_end = makeHTMLTags("div")
   div_grid = div().setParseAction(withClass("grid"))
   
   grid_expr = div_grid + SkipTo(div | div_end)("body")
   for grid_header in grid_expr.searchString(html):
       print(grid_header.body)
   
   div_any_type = div().setParseAction(withClass(withAttribute.ANY_VALUE))
   div_expr = div_any_type + SkipTo(div | div_end)("body")
   for div_header in div_expr.searchString(html):
       print(div_header.body)

prints:

   1 4 0 1 0

   1 4 0 1 0
   1,3 2,3 1,1

infixNotation(baseExpr, opList, lpar=Suppress:("("), rpar=Suppress:(")"))

source code 

Helper method for constructing grammars of expressions made up of operators working in a precedence hierarchy. Operators may be unary or binary, left- or right-associative. Parse actions can also be attached to operator expressions. The generated parser will also recognize the use of parentheses to override operator precedences (see example below).

Note: if you define a deep operator list, you may see performance issues when using infixNotation. See ParserElement.enablePackrat for a mechanism to potentially improve your parser performance.

Parameters:

  • baseExpr - expression representing the most basic element for the nested
  • opList - list of tuples, one for each operator precedence level in the expression grammar; each tuple is of the form (opExpr, numTerms, rightLeftAssoc, parseAction), where:
    • opExpr is the pyparsing expression for the operator; may also be a string, which will be converted to a Literal; if numTerms is 3, opExpr is a tuple of two expressions, for the two operators separating the 3 terms
    • numTerms is the number of terms for this operator (must be 1, 2, or 3)
    • rightLeftAssoc is the indicator whether the operator is right or left associative, using the pyparsing-defined constants opAssoc.RIGHT and opAssoc.LEFT.
    • parseAction is the parse action to be associated with expressions matching this operator expression (the parse action tuple member may be omitted)
  • lpar - expression for matching left-parentheses (default=Suppress('('))
  • rpar - expression for matching right-parentheses (default=Suppress(')'))

Example:

   # simple example of four-function arithmetic with ints and variable names
   integer = pyparsing_common.signed_integer
   varname = pyparsing_common.identifier 
   
   arith_expr = infixNotation(integer | varname,
       [
       ('-', 1, opAssoc.RIGHT),
       (oneOf('* /'), 2, opAssoc.LEFT),
       (oneOf('+ -'), 2, opAssoc.LEFT),
       ])
   
   arith_expr.runTests('''
       5+3*6
       (5+3)*6
       -2--11
       ''', fullDump=False)

prints:

   5+3*6
   [[5, '+', [3, '*', 6]]]

   (5+3)*6
   [[[5, '+', 3], '*', 6]]

   -2--11
   [[['-', 2], '-', ['-', 11]]]

operatorPrecedence(baseExpr, opList, lpar=Suppress:("("), rpar=Suppress:(")"))

source code 

(Deprecated) Former name of infixNotation, will be dropped in a future release.

nestedExpr(opener='(', closer=')', content=None, ignoreExpr=quotedString using single or double quotes)

source code 

Helper method for defining nested lists enclosed in opening and closing delimiters ("(" and ")" are the default).

Parameters:

  • opener - opening character for a nested list (default="("); can also be a pyparsing expression
  • closer - closing character for a nested list (default=")"); can also be a pyparsing expression
  • content - expression for items within the nested lists (default=None)
  • ignoreExpr - expression for ignoring opening and closing delimiters (default=quotedString)

If an expression is not provided for the content argument, the nested expression will capture all whitespace-delimited content between delimiters as a list of separate values.

Use the ignoreExpr argument to define expressions that may contain opening or closing characters that should not be treated as opening or closing characters for nesting, such as quotedString or a comment expression. Specify multiple expressions using an Or or MatchFirst. The default is quotedString, but if no expressions are to be ignored, then pass None for this argument.

Example:

   data_type = oneOf("void int short long char float double")
   decl_data_type = Combine(data_type + Optional(Word('*')))
   ident = Word(alphas+'_', alphanums+'_')
   number = pyparsing_common.number
   arg = Group(decl_data_type + ident)
   LPAR,RPAR = map(Suppress, "()")

   code_body = nestedExpr('{', '}', ignoreExpr=(quotedString | cStyleComment))

   c_function = (decl_data_type("type") 
                 + ident("name")
                 + LPAR + Optional(delimitedList(arg), [])("args") + RPAR 
                 + code_body("body"))
   c_function.ignore(cStyleComment)
   
   source_code = '''
       int is_odd(int x) { 
           return (x%2); 
       }
           
       int dec_to_hex(char hchar) { 
           if (hchar >= '0' && hchar <= '9') { 
               return (ord(hchar)-ord('0')); 
           } else { 
               return (10+ord(hchar)-ord('A'));
           } 
       }
   '''
   for func in c_function.searchString(source_code):
       print("%(name)s (%(type)s) args: %(args)s" % func)

prints:

   is_odd (int) args: [['int', 'x']]
   dec_to_hex (int) args: [['char', 'hchar']]

indentedBlock(blockStatementExpr, indentStack, indent=True)

source code 

Helper method for defining space-delimited indentation blocks, such as those used to define block statements in Python source code.

Parameters:

  • blockStatementExpr - expression defining syntax of statement that is repeated within the indented block
  • indentStack - list created by caller to manage indentation stack (multiple statementWithIndentedBlock expressions within a single grammar should share a common indentStack)
  • indent - boolean indicating whether block must be indented beyond the the current level; set to False for block of left-most statements (default=True)

A valid block must contain at least one blockStatement.

Example:

   data = '''
   def A(z):
     A1
     B = 100
     G = A2
     A2
     A3
   B
   def BB(a,b,c):
     BB1
     def BBA():
       bba1
       bba2
       bba3
   C
   D
   def spam(x,y):
        def eggs(z):
            pass
   '''


   indentStack = [1]
   stmt = Forward()

   identifier = Word(alphas, alphanums)
   funcDecl = ("def" + identifier + Group( "(" + Optional( delimitedList(identifier) ) + ")" ) + ":")
   func_body = indentedBlock(stmt, indentStack)
   funcDef = Group( funcDecl + func_body )

   rvalue = Forward()
   funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")")
   rvalue << (funcCall | identifier | Word(nums))
   assignment = Group(identifier + "=" + rvalue)
   stmt << ( funcDef | assignment | identifier )

   module_body = OneOrMore(stmt)

   parseTree = module_body.parseString(data)
   parseTree.pprint()

prints:

   [['def',
     'A',
     ['(', 'z', ')'],
     ':',
     [['A1'], [['B', '=', '100']], [['G', '=', 'A2']], ['A2'], ['A3']]],
    'B',
    ['def',
     'BB',
     ['(', 'a', 'b', 'c', ')'],
     ':',
     [['BB1'], [['def', 'BBA', ['(', ')'], ':', [['bba1'], ['bba2'], ['bba3']]]]]],
    'C',
    'D',
    ['def',
     'spam',
     ['(', 'x', 'y', ')'],
     ':',
     [[['def', 'eggs', ['(', 'z', ')'], ':', [['pass']]]]]]]

Variables Details

alphanums

Value:
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'

printables

Value:
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\\
'()*+,-./:;<=>?@[\\]^_`{|}~'

alphas8bit

Value:
u'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ'

commaSeparatedList

(Deprecated) Predefined expression of 1 or more printable words or quoted strings, separated by commas. This expression is deprecated in favor of pyparsing_common.comma_separated_list.

Value:
commaSeparatedList

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pyparsing
Module pyparsing
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Source Code for Module pyparsing

   1  # module pyparsing.py 
   2  # 
   3  # Copyright (c) 2003-2016  Paul T. McGuire 
   4  # 
   5  # Permission is hereby granted, free of charge, to any person obtaining 
   6  # a copy of this software and associated documentation files (the 
   7  # "Software"), to deal in the Software without restriction, including 
   8  # without limitation the rights to use, copy, modify, merge, publish, 
   9  # distribute, sublicense, and/or sell copies of the Software, and to 
  10  # permit persons to whom the Software is furnished to do so, subject to 
  11  # the following conditions: 
  12  # 
  13  # The above copyright notice and this permission notice shall be 
  14  # included in all copies or substantial portions of the Software. 
  15  # 
  16  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
  17  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
  18  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
  19  # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
  20  # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
  21  # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
  22  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
  23  # 
  24   
  25  __doc__ = \ 
  26  """ 
  27  pyparsing module - Classes and methods to define and execute parsing grammars 
  28   
  29  The pyparsing module is an alternative approach to creating and executing simple grammars, 
  30  vs. the traditional lex/yacc approach, or the use of regular expressions.  With pyparsing, you 
  31  don't need to learn a new syntax for defining grammars or matching expressions - the parsing module 
  32  provides a library of classes that you use to construct the grammar directly in Python. 
  33   
  34  Here is a program to parse "Hello, World!" (or any greeting of the form  
  35  C{"<salutation>, <addressee>!"}), built up using L{Word}, L{Literal}, and L{And} elements  
  36  (L{'+'<ParserElement.__add__>} operator gives L{And} expressions, strings are auto-converted to 
  37  L{Literal} expressions):: 
  38   
  39      from pyparsing import Word, alphas 
  40   
  41      # define grammar of a greeting 
  42      greet = Word(alphas) + "," + Word(alphas) + "!" 
  43   
  44      hello = "Hello, World!" 
  45      print (hello, "->", greet.parseString(hello)) 
  46   
  47  The program outputs the following:: 
  48   
  49      Hello, World! -> ['Hello', ',', 'World', '!'] 
  50   
  51  The Python representation of the grammar is quite readable, owing to the self-explanatory 
  52  class names, and the use of '+', '|' and '^' operators. 
  53   
  54  The L{ParseResults} object returned from L{ParserElement.parseString<ParserElement.parseString>} can be accessed as a nested list, a dictionary, or an 
  55  object with named attributes. 
  56   
  57  The pyparsing module handles some of the problems that are typically vexing when writing text parsers: 
  58   - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello  ,  World  !", etc.) 
  59   - quoted strings 
  60   - embedded comments 
  61  """ 
  62   
  63  __version__ = "2.1.10" 
  64  __versionTime__ = "07 Oct 2016 01:31 UTC" 
  65  __author__ = "Paul McGuire <ptmcg@users.sourceforge.net>" 
  66   
  67  import string 
  68  from weakref import ref as wkref 
  69  import copy 
  70  import sys 
  71  import warnings 
  72  import re 
  73  import sre_constants 
  74  import collections 
  75  import pprint 
  76  import traceback 
  77  import types 
  78  from datetime import datetime 
  79   
  80  try: 
  81      from _thread import RLock 
  82  except ImportError: 
  83      from threading import RLock 
  84   
  85  try: 
  86      from collections import OrderedDict as _OrderedDict 
  87  except ImportError: 
  88      try: 
  89          from ordereddict import OrderedDict as _OrderedDict 
  90      except ImportError: 
  91          _OrderedDict = None 
  92   
  93  #~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) ) 
  94   
  95  __all__ = [ 
  96  'And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty', 
  97  'FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal', 
  98  'MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or', 
  99  'ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException', 
 100  'ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException', 
 101  'Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter',  
 102  'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore', 
 103  'alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col', 
 104  'commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString', 
 105  'dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'hexnums', 
 106  'htmlComment', 'javaStyleComment', 'line', 'lineEnd', 'lineStart', 'lineno', 
 107  'makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral', 
 108  'nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables', 
 109  'punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity',  
 110  'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd', 
 111  'stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute', 
 112  'indentedBlock', 'originalTextFor', 'ungroup', 'infixNotation','locatedExpr', 'withClass', 
 113  'CloseMatch', 'tokenMap', 'pyparsing_common', 
 114  ] 
 115   
 116  system_version = tuple(sys.version_info)[:3] 
 117  PY_3 = system_version[0] == 3 
 118  if PY_3: 
 119      _MAX_INT = sys.maxsize 
 120      basestring = str 
 121      unichr = chr 
 122      _ustr = str 
 123   
 124      # build list of single arg builtins, that can be used as parse actions 
 125      singleArgBuiltins = [sum, len, sorted, reversed, list, tuple, set, any, all, min, max] 
 126   
 127  else: 
 128      _MAX_INT = sys.maxint 
 129      range = xrange 

 130   
 131 -    def _ustr(obj): 

 132          """Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries 
 133             str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It 
 134             then < returns the unicode object | encodes it with the default encoding | ... >. 
 135          """ 
 136          if isinstance(obj,unicode): 
 137              return obj 
 138   
 139          try: 
 140              # If this works, then _ustr(obj) has the same behaviour as str(obj), so 
 141              # it won't break any existing code. 
 142              return str(obj) 
 143   
 144          except UnicodeEncodeError: 
 145              # Else encode it 
 146              ret = unicode(obj).encode(sys.getdefaultencoding(), 'xmlcharrefreplace') 
 147              xmlcharref = Regex('&#\d+;') 
 148              xmlcharref.setParseAction(lambda t: '\\u' + hex(int(t[0][2:-1]))[2:]) 
 149              return xmlcharref.transformString(ret) 

 150   
 151      # build list of single arg builtins, tolerant of Python version, that can be used as parse actions 
 152      singleArgBuiltins = [] 
 153      import __builtin__ 
 154      for fname in "sum len sorted reversed list tuple set any all min max".split(): 
 155          try: 
 156              singleArgBuiltins.append(getattr(__builtin__,fname)) 
 157          except AttributeError: 
 158              continue 
 159               
 160  _generatorType = type((y for y in range(1))) 

 161    
 162 -def _xml_escape(data): 

 163      """Escape &, <, >, ", ', etc. in a string of data.""" 
 164   
 165      # ampersand must be replaced first 
 166      from_symbols = '&><"\'' 
 167      to_symbols = ('&'+s+';' for s in "amp gt lt quot apos".split()) 
 168      for from_,to_ in zip(from_symbols, to_symbols): 
 169          data = data.replace(from_, to_) 
 170      return data 

 171   

 172 -class _Constants(object): 

 173      pass 

 174   
 175  alphas     = string.ascii_uppercase + string.ascii_lowercase 
 176  nums       = "0123456789" 
 177  hexnums    = nums + "ABCDEFabcdef" 
 178  alphanums  = alphas + nums 
 179  _bslash    = chr(92) 
 180  printables = "".join(c for c in string.printable if c not in string.whitespace) 

 181   
 182 -class ParseBaseException(Exception): 

 183      """base exception class for all parsing runtime exceptions""" 
 184      # Performance tuning: we construct a *lot* of these, so keep this 
 185      # constructor as small and fast as possible 

 186 -    def __init__( self, pstr, loc=0, msg=None, elem=None ): 

 187          self.loc = loc 
 188          if msg is None: 
 189              self.msg = pstr 
 190              self.pstr = "" 
 191          else: 
 192              self.msg = msg 
 193              self.pstr = pstr 
 194          self.parserElement = elem 
 195          self.args = (pstr, loc, msg) 

 196   
 197      @classmethod 

 198 -    def _from_exception(cls, pe): 

 199          """ 
 200          internal factory method to simplify creating one type of ParseException  
 201          from another - avoids having __init__ signature conflicts among subclasses 
 202          """ 
 203          return cls(pe.pstr, pe.loc, pe.msg, pe.parserElement) 

 204   

 205 -    def __getattr__( self, aname ): 

 206          """supported attributes by name are: 
 207              - lineno - returns the line number of the exception text 
 208              - col - returns the column number of the exception text 
 209              - line - returns the line containing the exception text 
 210          """ 
 211          if( aname == "lineno" ): 
 212              return lineno( self.loc, self.pstr ) 
 213          elif( aname in ("col", "column") ): 
 214              return col( self.loc, self.pstr ) 
 215          elif( aname == "line" ): 
 216              return line( self.loc, self.pstr ) 
 217          else: 
 218              raise AttributeError(aname) 

 219   

 220 -    def __str__( self ): 

 221          return "%s (at char %d), (line:%d, col:%d)" % \ 
 222                  ( self.msg, self.loc, self.lineno, self.column ) 

 223 -    def __repr__( self ): 

 224          return _ustr(self) 

 225 -    def markInputline( self, markerString = ">!<" ): 

 226          """Extracts the exception line from the input string, and marks 
 227             the location of the exception with a special symbol. 
 228          """ 
 229          line_str = self.line 
 230          line_column = self.column - 1 
 231          if markerString: 
 232              line_str = "".join((line_str[:line_column], 
 233                                  markerString, line_str[line_column:])) 
 234          return line_str.strip() 

 235 -    def __dir__(self): 

 236          return "lineno col line".split() + dir(type(self)) 

 237   

 238 -class ParseException(ParseBaseException): 

 239      """ 
 240      Exception thrown when parse expressions don't match class; 
 241      supported attributes by name are: 
 242       - lineno - returns the line number of the exception text 
 243       - col - returns the column number of the exception text 
 244       - line - returns the line containing the exception text 
 245           
 246      Example:: 
 247          try: 
 248              Word(nums).setName("integer").parseString("ABC") 
 249          except ParseException as pe: 
 250              print(pe) 
 251              print("column: {}".format(pe.col)) 
 252               
 253      prints:: 
 254         Expected integer (at char 0), (line:1, col:1) 
 255          column: 1 
 256      """ 
 257      pass 

 258   

 259 -class ParseFatalException(ParseBaseException): 

 260      """user-throwable exception thrown when inconsistent parse content 
 261         is found; stops all parsing immediately""" 
 262      pass 

 263   

 264 -class ParseSyntaxException(ParseFatalException): 

 265      """just like L{ParseFatalException}, but thrown internally when an 
 266         L{ErrorStop<And._ErrorStop>} ('-' operator) indicates that parsing is to stop  
 267         immediately because an unbacktrackable syntax error has been found""" 
 268      pass 

 269   

 270  #~ class ReparseException(ParseBaseException): 
 271      #~ """Experimental class - parse actions can raise this exception to cause 
 272         #~ pyparsing to reparse the input string: 
 273          #~ - with a modified input string, and/or 
 274          #~ - with a modified start location 
 275         #~ Set the values of the ReparseException in the constructor, and raise the 
 276         #~ exception in a parse action to cause pyparsing to use the new string/location. 
 277         #~ Setting the values as None causes no change to be made. 
 278         #~ """ 
 279      #~ def __init_( self, newstring, restartLoc ): 
 280          #~ self.newParseText = newstring 
 281          #~ self.reparseLoc = restartLoc 
 282   
 283 -class RecursiveGrammarException(Exception): 

 284      """exception thrown by L{ParserElement.validate} if the grammar could be improperly recursive""" 

 285 -    def __init__( self, parseElementList ): 

 286          self.parseElementTrace = parseElementList 

 287   

 288 -    def __str__( self ): 

 289          return "RecursiveGrammarException: %s" % self.parseElementTrace 

 290   

 291 -class _ParseResultsWithOffset(object): 

 292 -    def __init__(self,p1,p2): 

 293          self.tup = (p1,p2) 

 294 -    def __getitem__(self,i): 

 295          return self.tup[i] 

 296 -    def __repr__(self): 

 297          return repr(self.tup[0]) 

 298 -    def setOffset(self,i): 

 299          self.tup = (self.tup[0],i) 

 300   

 301 -class ParseResults(object): 

 302      """ 
 303      Structured parse results, to provide multiple means of access to the parsed data: 
 304         - as a list (C{len(results)}) 
 305         - by list index (C{results[0], results[1]}, etc.) 
 306         - by attribute (C{results.<resultsName>} - see L{ParserElement.setResultsName}) 
 307   
 308      Example:: 
 309          integer = Word(nums) 
 310          date_str = (integer.setResultsName("year") + '/'  
 311                          + integer.setResultsName("month") + '/'  
 312                          + integer.setResultsName("day")) 
 313          # equivalent form: 
 314          # date_str = integer("year") + '/' + integer("month") + '/' + integer("day") 
 315   
 316          # parseString returns a ParseResults object 
 317          result = date_str.parseString("1999/12/31") 
 318   
 319          def test(s, fn=repr): 
 320              print("%s -> %s" % (s, fn(eval(s)))) 
 321          test("list(result)") 
 322          test("result[0]") 
 323          test("result['month']") 
 324          test("result.day") 
 325          test("'month' in result") 
 326          test("'minutes' in result") 
 327          test("result.dump()", str) 
 328      prints:: 
 329          list(result) -> ['1999', '/', '12', '/', '31'] 
 330          result[0] -> '1999' 
 331          result['month'] -> '12' 
 332          result.day -> '31' 
 333          'month' in result -> True 
 334          'minutes' in result -> False 
 335          result.dump() -> ['1999', '/', '12', '/', '31'] 
 336          - day: 31 
 337          - month: 12 
 338          - year: 1999 
 339      """ 

 340 -    def __new__(cls, toklist=None, name=None, asList=True, modal=True ): 

 341          if isinstance(toklist, cls): 
 342              return toklist 
 343          retobj = object.__new__(cls) 
 344          retobj.__doinit = True 
 345          return retobj 

 346   
 347      # Performance tuning: we construct a *lot* of these, so keep this 
 348      # constructor as small and fast as possible 

 349 -    def __init__( self, toklist=None, name=None, asList=True, modal=True, isinstance=isinstance ): 

 350          if self.__doinit: 
 351              self.__doinit = False 
 352              self.__name = None 
 353              self.__parent = None 
 354              self.__accumNames = {} 
 355              self.__asList = asList 
 356              self.__modal = modal 
 357              if toklist is None: 
 358                  toklist = [] 
 359              if isinstance(toklist, list): 
 360                  self.__toklist = toklist[:] 
 361              elif isinstance(toklist, _generatorType): 
 362                  self.__toklist = list(toklist) 
 363              else: 
 364                  self.__toklist = [toklist] 
 365              self.__tokdict = dict() 
 366   
 367          if name is not None and name: 
 368              if not modal: 
 369                  self.__accumNames[name] = 0 
 370              if isinstance(name,int): 
 371                  name = _ustr(name) # will always return a str, but use _ustr for consistency 
 372              self.__name = name 
 373              if not (isinstance(toklist, (type(None), basestring, list)) and toklist in (None,'',[])): 
 374                  if isinstance(toklist,basestring): 
 375                      toklist = [ toklist ] 
 376                  if asList: 
 377                      if isinstance(toklist,ParseResults): 
 378                          self[name] = _ParseResultsWithOffset(toklist.copy(),0) 
 379                      else: 
 380                          self[name] = _ParseResultsWithOffset(ParseResults(toklist[0]),0) 
 381                      self[name].__name = name 
 382                  else: 
 383                      try: 
 384                          self[name] = toklist[0] 
 385                      except (KeyError,TypeError,IndexError): 
 386                          self[name] = toklist 

 387   

 388 -    def __getitem__( self, i ): 

 389          if isinstance( i, (int,slice) ): 
 390              return self.__toklist[i] 
 391          else: 
 392              if i not in self.__accumNames: 
 393                  return self.__tokdict[i][-1][0] 
 394              else: 
 395                  return ParseResults([ v[0] for v in self.__tokdict[i] ]) 

 396   

 397 -    def __setitem__( self, k, v, isinstance=isinstance ): 

 398          if isinstance(v,_ParseResultsWithOffset): 
 399              self.__tokdict[k] = self.__tokdict.get(k,list()) + [v] 
 400              sub = v[0] 
 401          elif isinstance(k,(int,slice)): 
 402              self.__toklist[k] = v 
 403              sub = v 
 404          else: 
 405              self.__tokdict[k] = self.__tokdict.get(k,list()) + [_ParseResultsWithOffset(v,0)] 
 406              sub = v 
 407          if isinstance(sub,ParseResults): 
 408              sub.__parent = wkref(self) 

 409   

 410 -    def __delitem__( self, i ): 

 411          if isinstance(i,(int,slice)): 
 412              mylen = len( self.__toklist ) 
 413              del self.__toklist[i] 
 414   
 415              # convert int to slice 
 416              if isinstance(i, int): 
 417                  if i < 0: 
 418                      i += mylen 
 419                  i = slice(i, i+1) 
 420              # get removed indices 
 421              removed = list(range(*i.indices(mylen))) 
 422              removed.reverse() 
 423              # fixup indices in token dictionary 
 424              for name,occurrences in self.__tokdict.items(): 
 425                  for j in removed: 
 426                      for k, (value, position) in enumerate(occurrences): 
 427                          occurrences[k] = _ParseResultsWithOffset(value, position - (position > j)) 
 428          else: 
 429              del self.__tokdict[i] 

 430   

 431 -    def __contains__( self, k ): 

 432          return k in self.__tokdict 

 433   

 434 -    def __len__( self ): return len( self.__toklist ) 

 435 -    def __bool__(self): return ( not not self.__toklist ) 

 436      __nonzero__ = __bool__ 

 437 -    def __iter__( self ): return iter( self.__toklist ) 

 438 -    def __reversed__( self ): return iter( self.__toklist[::-1] ) 

 439 -    def _iterkeys( self ): 

 440          if hasattr(self.__tokdict, "iterkeys"): 
 441              return self.__tokdict.iterkeys() 
 442          else: 
 443              return iter(self.__tokdict) 

 444   

 445 -    def _itervalues( self ): 

 446          return (self[k] for k in self._iterkeys()) 

 447               

 448 -    def _iteritems( self ): 

 449          return ((k, self[k]) for k in self._iterkeys()) 

 450   
 451      if PY_3: 
 452          keys = _iterkeys        
 453          """Returns an iterator of all named result keys (Python 3.x only).""" 
 454   
 455          values = _itervalues 
 456          """Returns an iterator of all named result values (Python 3.x only).""" 
 457   
 458          items = _iteritems 
 459          """Returns an iterator of all named result key-value tuples (Python 3.x only).""" 
 460   
 461      else: 
 462          iterkeys = _iterkeys 
 463          """Returns an iterator of all named result keys (Python 2.x only).""" 
 464   
 465          itervalues = _itervalues 
 466          """Returns an iterator of all named result values (Python 2.x only).""" 
 467   
 468          iteritems = _iteritems 
 469          """Returns an iterator of all named result key-value tuples (Python 2.x only).""" 
 470   

 471 -        def keys( self ): 

 472              """Returns all named result keys (as a list in Python 2.x, as an iterator in Python 3.x).""" 
 473              return list(self.iterkeys()) 

 474   

 475 -        def values( self ): 

 476              """Returns all named result values (as a list in Python 2.x, as an iterator in Python 3.x).""" 
 477              return list(self.itervalues()) 

 478                   

 479 -        def items( self ): 

 480              """Returns all named result key-values (as a list of tuples in Python 2.x, as an iterator in Python 3.x).""" 
 481              return list(self.iteritems()) 

 482   

 483 -    def haskeys( self ): 

 484          """Since keys() returns an iterator, this method is helpful in bypassing 
 485             code that looks for the existence of any defined results names.""" 
 486          return bool(self.__tokdict) 

 487           

 488 -    def pop( self, *args, **kwargs): 

 489          """ 
 490          Removes and returns item at specified index (default=C{last}). 
 491          Supports both C{list} and C{dict} semantics for C{pop()}. If passed no 
 492          argument or an integer argument, it will use C{list} semantics 
 493          and pop tokens from the list of parsed tokens. If passed a  
 494          non-integer argument (most likely a string), it will use C{dict} 
 495          semantics and pop the corresponding value from any defined  
 496          results names. A second default return value argument is  
 497          supported, just as in C{dict.pop()}. 
 498   
 499          Example:: 
 500              def remove_first(tokens): 
 501                  tokens.pop(0) 
 502              print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321'] 
 503              print(OneOrMore(Word(nums)).addParseAction(remove_first).parseString("0 123 321")) # -> ['123', '321'] 
 504   
 505              label = Word(alphas) 
 506              patt = label("LABEL") + OneOrMore(Word(nums)) 
 507              print(patt.parseString("AAB 123 321").dump()) 
 508   
 509              # Use pop() in a parse action to remove named result (note that corresponding value is not 
 510              # removed from list form of results) 
 511              def remove_LABEL(tokens): 
 512                  tokens.pop("LABEL") 
 513                  return tokens 
 514              patt.addParseAction(remove_LABEL) 
 515              print(patt.parseString("AAB 123 321").dump()) 
 516          prints:: 
 517              ['AAB', '123', '321'] 
 518              - LABEL: AAB 
 519   
 520              ['AAB', '123', '321'] 
 521          """ 
 522          if not args: 
 523              args = [-1] 
 524          for k,v in kwargs.items(): 
 525              if k == 'default': 
 526                  args = (args[0], v) 
 527              else: 
 528                  raise TypeError("pop() got an unexpected keyword argument '%s'" % k) 
 529          if (isinstance(args[0], int) or  
 530                          len(args) == 1 or  
 531                          args[0] in self): 
 532              index = args[0] 
 533              ret = self[index] 
 534              del self[index] 
 535              return ret 
 536          else: 
 537              defaultvalue = args[1] 
 538              return defaultvalue 

 539   

 540 -    def get(self, key, defaultValue=None): 

 541          """ 
 542          Returns named result matching the given key, or if there is no 
 543          such name, then returns the given C{defaultValue} or C{None} if no 
 544          C{defaultValue} is specified. 
 545   
 546          Similar to C{dict.get()}. 
 547           
 548          Example:: 
 549              integer = Word(nums) 
 550              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")            
 551   
 552              result = date_str.parseString("1999/12/31") 
 553              print(result.get("year")) # -> '1999' 
 554              print(result.get("hour", "not specified")) # -> 'not specified' 
 555              print(result.get("hour")) # -> None 
 556          """ 
 557          if key in self: 
 558              return self[key] 
 559          else: 
 560              return defaultValue 

 561   

 562 -    def insert( self, index, insStr ): 

 563          """ 
 564          Inserts new element at location index in the list of parsed tokens. 
 565           
 566          Similar to C{list.insert()}. 
 567   
 568          Example:: 
 569              print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321'] 
 570   
 571              # use a parse action to insert the parse location in the front of the parsed results 
 572              def insert_locn(locn, tokens): 
 573                  tokens.insert(0, locn) 
 574              print(OneOrMore(Word(nums)).addParseAction(insert_locn).parseString("0 123 321")) # -> [0, '0', '123', '321'] 
 575          """ 
 576          self.__toklist.insert(index, insStr) 
 577          # fixup indices in token dictionary 
 578          for name,occurrences in self.__tokdict.items(): 
 579              for k, (value, position) in enumerate(occurrences): 
 580                  occurrences[k] = _ParseResultsWithOffset(value, position + (position > index)) 

 581   

 582 -    def append( self, item ): 

 583          """ 
 584          Add single element to end of ParseResults list of elements. 
 585   
 586          Example:: 
 587              print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321'] 
 588               
 589              # use a parse action to compute the sum of the parsed integers, and add it to the end 
 590              def append_sum(tokens): 
 591                  tokens.append(sum(map(int, tokens))) 
 592              print(OneOrMore(Word(nums)).addParseAction(append_sum).parseString("0 123 321")) # -> ['0', '123', '321', 444] 
 593          """ 
 594          self.__toklist.append(item) 

 595   

 596 -    def extend( self, itemseq ): 

 597          """ 
 598          Add sequence of elements to end of ParseResults list of elements. 
 599   
 600          Example:: 
 601              patt = OneOrMore(Word(alphas)) 
 602               
 603              # use a parse action to append the reverse of the matched strings, to make a palindrome 
 604              def make_palindrome(tokens): 
 605                  tokens.extend(reversed([t[::-1] for t in tokens])) 
 606                  return ''.join(tokens) 
 607              print(patt.addParseAction(make_palindrome).parseString("lskdj sdlkjf lksd")) # -> 'lskdjsdlkjflksddsklfjkldsjdksl' 
 608          """ 
 609          if isinstance(itemseq, ParseResults): 
 610              self += itemseq 
 611          else: 
 612              self.__toklist.extend(itemseq) 

 613   

 614 -    def clear( self ): 

 615          """ 
 616          Clear all elements and results names. 
 617          """ 
 618          del self.__toklist[:] 
 619          self.__tokdict.clear() 

 620   

 621 -    def __getattr__( self, name ): 

 622          try: 
 623              return self[name] 
 624          except KeyError: 
 625              return "" 
 626               
 627          if name in self.__tokdict: 
 628              if name not in self.__accumNames: 
 629                  return self.__tokdict[name][-1][0] 
 630              else: 
 631                  return ParseResults([ v[0] for v in self.__tokdict[name] ]) 
 632          else: 
 633              return "" 

 634   

 635 -    def __add__( self, other ): 

 636          ret = self.copy() 
 637          ret += other 
 638          return ret 

 639   

 640 -    def __iadd__( self, other ): 

 641          if other.__tokdict: 
 642              offset = len(self.__toklist) 
 643              addoffset = lambda a: offset if a<0 else a+offset 
 644              otheritems = other.__tokdict.items() 
 645              otherdictitems = [(k, _ParseResultsWithOffset(v[0],addoffset(v[1])) ) 
 646                                  for (k,vlist) in otheritems for v in vlist] 
 647              for k,v in otherdictitems: 
 648                  self[k] = v 
 649                  if isinstance(v[0],ParseResults): 
 650                      v[0].__parent = wkref(self) 
 651               
 652          self.__toklist += other.__toklist 
 653          self.__accumNames.update( other.__accumNames ) 
 654          return self 

 655   

 656 -    def __radd__(self, other): 

 657          if isinstance(other,int) and other == 0: 
 658              # useful for merging many ParseResults using sum() builtin 
 659              return self.copy() 
 660          else: 
 661              # this may raise a TypeError - so be it 
 662              return other + self 

 663           

 664 -    def __repr__( self ): 

 665          return "(%s, %s)" % ( repr( self.__toklist ), repr( self.__tokdict ) ) 

 666   

 667 -    def __str__( self ): 

 668          return '[' + ', '.join(_ustr(i) if isinstance(i, ParseResults) else repr(i) for i in self.__toklist) + ']' 

 669   

 670 -    def _asStringList( self, sep='' ): 

 671          out = [] 
 672          for item in self.__toklist: 
 673              if out and sep: 
 674                  out.append(sep) 
 675              if isinstance( item, ParseResults ): 
 676                  out += item._asStringList() 
 677              else: 
 678                  out.append( _ustr(item) ) 
 679          return out 

 680   

 681 -    def asList( self ): 

 682          """ 
 683          Returns the parse results as a nested list of matching tokens, all converted to strings. 
 684   
 685          Example:: 
 686              patt = OneOrMore(Word(alphas)) 
 687              result = patt.parseString("sldkj lsdkj sldkj") 
 688              # even though the result prints in string-like form, it is actually a pyparsing ParseResults 
 689              print(type(result), result) # -> <class 'pyparsing.ParseResults'> ['sldkj', 'lsdkj', 'sldkj'] 
 690               
 691              # Use asList() to create an actual list 
 692              result_list = result.asList() 
 693              print(type(result_list), result_list) # -> <class 'list'> ['sldkj', 'lsdkj', 'sldkj'] 
 694          """ 
 695          return [res.asList() if isinstance(res,ParseResults) else res for res in self.__toklist] 

 696   

 697 -    def asDict( self ): 

 698          """ 
 699          Returns the named parse results as a nested dictionary. 
 700   
 701          Example:: 
 702              integer = Word(nums) 
 703              date_str = integer("year") + '/' + integer("month") + '/' + integer("day") 
 704               
 705              result = date_str.parseString('12/31/1999') 
 706              print(type(result), repr(result)) # -> <class 'pyparsing.ParseResults'> (['12', '/', '31', '/', '1999'], {'day': [('1999', 4)], 'year': [('12', 0)], 'month': [('31', 2)]}) 
 707               
 708              result_dict = result.asDict() 
 709              print(type(result_dict), repr(result_dict)) # -> <class 'dict'> {'day': '1999', 'year': '12', 'month': '31'} 
 710   
 711              # even though a ParseResults supports dict-like access, sometime you just need to have a dict 
 712              import json 
 713              print(json.dumps(result)) # -> Exception: TypeError: ... is not JSON serializable 
 714              print(json.dumps(result.asDict())) # -> {"month": "31", "day": "1999", "year": "12"} 
 715          """ 
 716          if PY_3: 
 717              item_fn = self.items 
 718          else: 
 719              item_fn = self.iteritems 
 720               
 721          def toItem(obj): 
 722              if isinstance(obj, ParseResults): 
 723                  if obj.haskeys(): 
 724                      return obj.asDict() 
 725                  else: 
 726                      return [toItem(v) for v in obj] 
 727              else: 
 728                  return obj 

 729                   
 730          return dict((k,toItem(v)) for k,v in item_fn()) 

 731   

 732 -    def copy( self ): 

 733          """ 
 734          Returns a new copy of a C{ParseResults} object. 
 735          """ 
 736          ret = ParseResults( self.__toklist ) 
 737          ret.__tokdict = self.__tokdict.copy() 
 738          ret.__parent = self.__parent 
 739          ret.__accumNames.update( self.__accumNames ) 
 740          ret.__name = self.__name 
 741          return ret 

 742   

 743 -    def asXML( self, doctag=None, namedItemsOnly=False, indent="", formatted=True ): 

 744          """ 
 745          (Deprecated) Returns the parse results as XML. Tags are created for tokens and lists that have defined results names. 
 746          """ 
 747          nl = "\n" 
 748          out = [] 
 749          namedItems = dict((v[1],k) for (k,vlist) in self.__tokdict.items() 
 750                                                              for v in vlist) 
 751          nextLevelIndent = indent + "  " 
 752   
 753          # collapse out indents if formatting is not desired 
 754          if not formatted: 
 755              indent = "" 
 756              nextLevelIndent = "" 
 757              nl = "" 
 758   
 759          selfTag = None 
 760          if doctag is not None: 
 761              selfTag = doctag 
 762          else: 
 763              if self.__name: 
 764                  selfTag = self.__name 
 765   
 766          if not selfTag: 
 767              if namedItemsOnly: 
 768                  return "" 
 769              else: 
 770                  selfTag = "ITEM" 
 771   
 772          out += [ nl, indent, "<", selfTag, ">" ] 
 773   
 774          for i,res in enumerate(self.__toklist): 
 775              if isinstance(res,ParseResults): 
 776                  if i in namedItems: 
 777                      out += [ res.asXML(namedItems[i], 
 778                                          namedItemsOnly and doctag is None, 
 779                                          nextLevelIndent, 
 780                                          formatted)] 
 781                  else: 
 782                      out += [ res.asXML(None, 
 783                                          namedItemsOnly and doctag is None, 
 784                                          nextLevelIndent, 
 785                                          formatted)] 
 786              else: 
 787                  # individual token, see if there is a name for it 
 788                  resTag = None 
 789                  if i in namedItems: 
 790                      resTag = namedItems[i] 
 791                  if not resTag: 
 792                      if namedItemsOnly: 
 793                          continue 
 794                      else: 
 795                          resTag = "ITEM" 
 796                  xmlBodyText = _xml_escape(_ustr(res)) 
 797                  out += [ nl, nextLevelIndent, "<", resTag, ">", 
 798                                                  xmlBodyText, 
 799                                                  "</", resTag, ">" ] 
 800   
 801          out += [ nl, indent, "</", selfTag, ">" ] 
 802          return "".join(out) 

 803   

 804 -    def __lookup(self,sub): 

 805          for k,vlist in self.__tokdict.items(): 
 806              for v,loc in vlist: 
 807                  if sub is v: 
 808                      return k 
 809          return None 

 810   

 811 -    def getName(self): 

 812          """ 
 813          Returns the results name for this token expression. Useful when several  
 814          different expressions might match at a particular location. 
 815   
 816          Example:: 
 817              integer = Word(nums) 
 818              ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d") 
 819              house_number_expr = Suppress('#') + Word(nums, alphanums) 
 820              user_data = (Group(house_number_expr)("house_number")  
 821                          | Group(ssn_expr)("ssn") 
 822                          | Group(integer)("age")) 
 823              user_info = OneOrMore(user_data) 
 824               
 825              result = user_info.parseString("22 111-22-3333 #221B") 
 826              for item in result: 
 827                  print(item.getName(), ':', item[0]) 
 828          prints:: 
 829              age : 22 
 830              ssn : 111-22-3333 
 831              house_number : 221B 
 832          """ 
 833          if self.__name: 
 834              return self.__name 
 835          elif self.__parent: 
 836              par = self.__parent() 
 837              if par: 
 838                  return par.__lookup(self) 
 839              else: 
 840                  return None 
 841          elif (len(self) == 1 and 
 842                 len(self.__tokdict) == 1 and 
 843                 next(iter(self.__tokdict.values()))[0][1] in (0,-1)): 
 844              return next(iter(self.__tokdict.keys())) 
 845          else: 
 846              return None 

 847   

 848 -    def dump(self, indent='', depth=0, full=True): 

 849          """ 
 850          Diagnostic method for listing out the contents of a C{ParseResults}. 
 851          Accepts an optional C{indent} argument so that this string can be embedded 
 852          in a nested display of other data. 
 853   
 854          Example:: 
 855              integer = Word(nums) 
 856              date_str = integer("year") + '/' + integer("month") + '/' + integer("day") 
 857               
 858              result = date_str.parseString('12/31/1999') 
 859              print(result.dump()) 
 860          prints:: 
 861              ['12', '/', '31', '/', '1999'] 
 862              - day: 1999 
 863              - month: 31 
 864              - year: 12 
 865          """ 
 866          out = [] 
 867          NL = '\n' 
 868          out.append( indent+_ustr(self.asList()) ) 
 869          if full: 
 870              if self.haskeys(): 
 871                  items = sorted((str(k), v) for k,v in self.items()) 
 872                  for k,v in items: 
 873                      if out: 
 874                          out.append(NL) 
 875                      out.append( "%s%s- %s: " % (indent,('  '*depth), k) ) 
 876                      if isinstance(v,ParseResults): 
 877                          if v: 
 878                              out.append( v.dump(indent,depth+1) ) 
 879                          else: 
 880                              out.append(_ustr(v)) 
 881                      else: 
 882                          out.append(repr(v)) 
 883              elif any(isinstance(vv,ParseResults) for vv in self): 
 884                  v = self 
 885                  for i,vv in enumerate(v): 
 886                      if isinstance(vv,ParseResults): 
 887                          out.append("\n%s%s[%d]:\n%s%s%s" % (indent,('  '*(depth)),i,indent,('  '*(depth+1)),vv.dump(indent,depth+1) )) 
 888                      else: 
 889                          out.append("\n%s%s[%d]:\n%s%s%s" % (indent,('  '*(depth)),i,indent,('  '*(depth+1)),_ustr(vv))) 
 890               
 891          return "".join(out) 

 892   

 893 -    def pprint(self, *args, **kwargs): 

 894          """ 
 895          Pretty-printer for parsed results as a list, using the C{pprint} module. 
 896          Accepts additional positional or keyword args as defined for the  
 897          C{pprint.pprint} method. (U{http://docs.python.org/3/library/pprint.html#pprint.pprint}) 
 898   
 899          Example:: 
 900              ident = Word(alphas, alphanums) 
 901              num = Word(nums) 
 902              func = Forward() 
 903              term = ident | num | Group('(' + func + ')') 
 904              func <<= ident + Group(Optional(delimitedList(term))) 
 905              result = func.parseString("fna a,b,(fnb c,d,200),100") 
 906              result.pprint(width=40) 
 907          prints:: 
 908              ['fna', 
 909               ['a', 
 910                'b', 
 911                ['(', 'fnb', ['c', 'd', '200'], ')'], 
 912                '100']] 
 913          """ 
 914          pprint.pprint(self.asList(), *args, **kwargs) 

 915   
 916      # add support for pickle protocol 

 917 -    def __getstate__(self): 

 918          return ( self.__toklist, 
 919                   ( self.__tokdict.copy(), 
 920                     self.__parent is not None and self.__parent() or None, 
 921                     self.__accumNames, 
 922                     self.__name ) ) 

 923   

 924 -    def __setstate__(self,state): 

 925          self.__toklist = state[0] 
 926          (self.__tokdict, 
 927           par, 
 928           inAccumNames, 
 929           self.__name) = state[1] 
 930          self.__accumNames = {} 
 931          self.__accumNames.update(inAccumNames) 
 932          if par is not None: 
 933              self.__parent = wkref(par) 
 934          else: 
 935              self.__parent = None 

 936   

 937 -    def __getnewargs__(self): 

 938          return self.__toklist, self.__name, self.__asList, self.__modal 

 939   

 940 -    def __dir__(self): 

 941          return (dir(type(self)) + list(self.keys()))

942 943 collections.MutableMapping.register(ParseResults)
944 945 -def col (loc,strg):
946 """Returns current column within a string, counting newlines as line separators. 947 The first column is number 1. 948 949 Note: the default parsing behavior is to expand tabs in the input string 950 before starting the parsing process. See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information 951 on parsing strings containing C{<TAB>}s, and suggested methods to maintain a 952 consistent view of the parsed string, the parse location, and line and column 953 positions within the parsed string. 954 """ 955 s = strg 956 return 1 if 0<loc<len(s) and s[loc-1] == '\n' else loc - s.rfind("\n", 0, loc)
957
958 -def lineno(loc,strg):
959 """Returns current line number within a string, counting newlines as line separators. 960 The first line is number 1. 961 962 Note: the default parsing behavior is to expand tabs in the input string 963 before starting the parsing process. See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information 964 on parsing strings containing C{<TAB>}s, and suggested methods to maintain a 965 consistent view of the parsed string, the parse location, and line and column 966 positions within the parsed string. 967 """ 968 return strg.count("\n",0,loc) + 1
969
970 -def line( loc, strg ):
971 """Returns the line of text containing loc within a string, counting newlines as line separators. 972 """ 973 lastCR = strg.rfind("\n", 0, loc) 974 nextCR = strg.find("\n", loc) 975 if nextCR >= 0: 976 return strg[lastCR+1:nextCR] 977 else: 978 return strg[lastCR+1:]
979
980 -def _defaultStartDebugAction( instring, loc, expr ):
981 print (("Match " + _ustr(expr) + " at loc " + _ustr(loc) + "(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )))
982
983 -def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ):
984 print ("Matched " + _ustr(expr) + " -> " + str(toks.asList()))
985
986 -def _defaultExceptionDebugAction( instring, loc, expr, exc ):
987 print ("Exception raised:" + _ustr(exc))
988
989 -def nullDebugAction(*args):
990 """'Do-nothing' debug action, to suppress debugging output during parsing.""" 991 pass
992 993 # Only works on Python 3.x - nonlocal is toxic to Python 2 installs 994 #~ 'decorator to trim function calls to match the arity of the target' 995 #~ def _trim_arity(func, maxargs=3): 996 #~ if func in singleArgBuiltins: 997 #~ return lambda s,l,t: func(t) 998 #~ limit = 0 999 #~ foundArity = False 1000 #~ def wrapper(*args): 1001 #~ nonlocal limit,foundArity 1002 #~ while 1: 1003 #~ try: 1004 #~ ret = func(*args[limit:]) 1005 #~ foundArity = True 1006 #~ return ret 1007 #~ except TypeError: 1008 #~ if limit == maxargs or foundArity: 1009 #~ raise 1010 #~ limit += 1 1011 #~ continue 1012 #~ return wrapper 1013 1014 # this version is Python 2.x-3.x cross-compatible 1015 'decorator to trim function calls to match the arity of the target'
1016 -def _trim_arity(func, maxargs=2):
1017 if func in singleArgBuiltins: 1018 return lambda s,l,t: func(t) 1019 limit = [0] 1020 foundArity = [False] 1021 1022 # traceback return data structure changed in Py3.5 - normalize back to plain tuples 1023 if system_version[:2] >= (3,5): 1024 def extract_stack(limit=0): 1025 # special handling for Python 3.5.0 - extra deep call stack by 1 1026 offset = -3 if system_version == (3,5,0) else -2 1027 frame_summary = traceback.extract_stack(limit=-offset+limit-1)[offset] 1028 return [(frame_summary.filename, frame_summary.lineno)]
1029 def extract_tb(tb, limit=0): 1030 frames = traceback.extract_tb(tb, limit=limit) 1031 frame_summary = frames[-1] 1032 return [(frame_summary.filename, frame_summary.lineno)] 1033 else: 1034 extract_stack = traceback.extract_stack 1035 extract_tb = traceback.extract_tb 1036 1037 # synthesize what would be returned by traceback.extract_stack at the call to 1038 # user's parse action 'func', so that we don't incur call penalty at parse time 1039 1040 LINE_DIFF = 6 1041 # IF ANY CODE CHANGES, EVEN JUST COMMENTS OR BLANK LINES, BETWEEN THE NEXT LINE AND 1042 # THE CALL TO FUNC INSIDE WRAPPER, LINE_DIFF MUST BE MODIFIED!!!! 1043 this_line = extract_stack(limit=2)[-1] 1044 pa_call_line_synth = (this_line[0], this_line[1]+LINE_DIFF) 1045 1046 def wrapper(*args): 1047 while 1: 1048 try: 1049 ret = func(*args[limit[0]:]) 1050 foundArity[0] = True 1051 return ret 1052 except TypeError: 1053 # re-raise TypeErrors if they did not come from our arity testing 1054 if foundArity[0]: 1055 raise 1056 else: 1057 try: 1058 tb = sys.exc_info()[-1] 1059 if not extract_tb(tb, limit=2)[-1][:2] == pa_call_line_synth: 1060 raise 1061 finally: 1062 del tb 1063 1064 if limit[0] <= maxargs: 1065 limit[0] += 1 1066 continue 1067 raise 1068 1069 # copy func name to wrapper for sensible debug output 1070 func_name = "<parse action>" 1071 try: 1072 func_name = getattr(func, '__name__', 1073 getattr(func, '__class__').__name__) 1074 except Exception: 1075 func_name = str(func) 1076 wrapper.__name__ = func_name 1077 1078 return wrapper 1079
1080 -class ParserElement(object):
1081 """Abstract base level parser element class.""" 1082 DEFAULT_WHITE_CHARS = " \n\t\r" 1083 verbose_stacktrace = False 1084 1085 @staticmethod
1086 - def setDefaultWhitespaceChars( chars ):
1087 r""" 1088 Overrides the default whitespace chars 1089 1090 Example:: 1091 # default whitespace chars are space, <TAB> and newline 1092 OneOrMore(Word(alphas)).parseString("abc def\nghi jkl") # -> ['abc', 'def', 'ghi', 'jkl'] 1093 1094 # change to just treat newline as significant 1095 ParserElement.setDefaultWhitespaceChars(" \t") 1096 OneOrMore(Word(alphas)).parseString("abc def\nghi jkl") # -> ['abc', 'def'] 1097 """ 1098 ParserElement.DEFAULT_WHITE_CHARS = chars
1099 1100 @staticmethod
1101 - def inlineLiteralsUsing(cls):
1102 """ 1103 Set class to be used for inclusion of string literals into a parser. 1104 1105 Example:: 1106 # default literal class used is Literal 1107 integer = Word(nums) 1108 date_str = integer("year") + '/' + integer("month") + '/' + integer("day") 1109 1110 date_str.parseString("1999/12/31") # -> ['1999', '/', '12', '/', '31'] 1111 1112 1113 # change to Suppress 1114 ParserElement.inlineLiteralsUsing(Suppress) 1115 date_str = integer("year") + '/' + integer("month") + '/' + integer("day") 1116 1117 date_str.parseString("1999/12/31") # -> ['1999', '12', '31'] 1118 """ 1119 ParserElement._literalStringClass = cls
1120
1121 - def __init__( self, savelist=False ):
1122 self.parseAction = list() 1123 self.failAction = None 1124 #~ self.name = "<unknown>" # don't define self.name, let subclasses try/except upcall 1125 self.strRepr = None 1126 self.resultsName = None 1127 self.saveAsList = savelist 1128 self.skipWhitespace = True 1129 self.whiteChars = ParserElement.DEFAULT_WHITE_CHARS 1130 self.copyDefaultWhiteChars = True 1131 self.mayReturnEmpty = False # used when checking for left-recursion 1132 self.keepTabs = False 1133 self.ignoreExprs = list() 1134 self.debug = False 1135 self.streamlined = False 1136 self.mayIndexError = True # used to optimize exception handling for subclasses that don't advance parse index 1137 self.errmsg = "" 1138 self.modalResults = True # used to mark results names as modal (report only last) or cumulative (list all) 1139 self.debugActions = ( None, None, None ) #custom debug actions 1140 self.re = None 1141 self.callPreparse = True # used to avoid redundant calls to preParse 1142 self.callDuringTry = False
1143
1144 - def copy( self ):
1145 """ 1146 Make a copy of this C{ParserElement}. Useful for defining different parse actions 1147 for the same parsing pattern, using copies of the original parse element. 1148 1149 Example:: 1150 integer = Word(nums).setParseAction(lambda toks: int(toks[0])) 1151 integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K") 1152 integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M") 1153 1154 print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M")) 1155 prints:: 1156 [5120, 100, 655360, 268435456] 1157 Equivalent form of C{expr.copy()} is just C{expr()}:: 1158 integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M") 1159 """ 1160 cpy = copy.copy( self ) 1161 cpy.parseAction = self.parseAction[:] 1162 cpy.ignoreExprs = self.ignoreExprs[:] 1163 if self.copyDefaultWhiteChars: 1164 cpy.whiteChars = ParserElement.DEFAULT_WHITE_CHARS 1165 return cpy
1166
1167 - def setName( self, name ):
1168 """ 1169 Define name for this expression, makes debugging and exception messages clearer. 1170 1171 Example:: 1172 Word(nums).parseString("ABC") # -> Exception: Expected W:(0123...) (at char 0), (line:1, col:1) 1173 Word(nums).setName("integer").parseString("ABC") # -> Exception: Expected integer (at char 0), (line:1, col:1) 1174 """ 1175 self.name = name 1176 self.errmsg = "Expected " + self.name 1177 if hasattr(self,"exception"): 1178 self.exception.msg = self.errmsg 1179 return self
1180
1181 - def setResultsName( self, name, listAllMatches=False ):
1182 """ 1183 Define name for referencing matching tokens as a nested attribute 1184 of the returned parse results. 1185 NOTE: this returns a *copy* of the original C{ParserElement} object; 1186 this is so that the client can define a basic element, such as an 1187 integer, and reference it in multiple places with different names. 1188 1189 You can also set results names using the abbreviated syntax, 1190 C{expr("name")} in place of C{expr.setResultsName("name")} - 1191 see L{I{__call__}<__call__>}. 1192 1193 Example:: 1194 date_str = (integer.setResultsName("year") + '/' 1195 + integer.setResultsName("month") + '/' 1196 + integer.setResultsName("day")) 1197 1198 # equivalent form: 1199 date_str = integer("year") + '/' + integer("month") + '/' + integer("day") 1200 """ 1201 newself = self.copy() 1202 if name.endswith("*"): 1203 name = name[:-1] 1204 listAllMatches=True 1205 newself.resultsName = name 1206 newself.modalResults = not listAllMatches 1207 return newself
1208
1209 - def setBreak(self,breakFlag = True):
1210 """Method to invoke the Python pdb debugger when this element is 1211 about to be parsed. Set C{breakFlag} to True to enable, False to 1212 disable. 1213 """ 1214 if breakFlag: 1215 _parseMethod = self._parse 1216 def breaker(instring, loc, doActions=True, callPreParse=True): 1217 import pdb 1218 pdb.set_trace() 1219 return _parseMethod( instring, loc, doActions, callPreParse )
1220 breaker._originalParseMethod = _parseMethod 1221 self._parse = breaker 1222 else: 1223 if hasattr(self._parse,"_originalParseMethod"): 1224 self._parse = self._parse._originalParseMethod 1225 return self
1226
1227 - def setParseAction( self, *fns, **kwargs ):
1228 """ 1229 Define action to perform when successfully matching parse element definition. 1230 Parse action fn is a callable method with 0-3 arguments, called as C{fn(s,loc,toks)}, 1231 C{fn(loc,toks)}, C{fn(toks)}, or just C{fn()}, where: 1232 - s = the original string being parsed (see note below) 1233 - loc = the location of the matching substring 1234 - toks = a list of the matched tokens, packaged as a C{L{ParseResults}} object 1235 If the functions in fns modify the tokens, they can return them as the return 1236 value from fn, and the modified list of tokens will replace the original. 1237 Otherwise, fn does not need to return any value. 1238 1239 Optional keyword arguments: 1240 - callDuringTry = (default=C{False}) indicate if parse action should be run during lookaheads and alternate testing 1241 1242 Note: the default parsing behavior is to expand tabs in the input string 1243 before starting the parsing process. See L{I{parseString}<parseString>} for more information 1244 on parsing strings containing C{<TAB>}s, and suggested methods to maintain a 1245 consistent view of the parsed string, the parse location, and line and column 1246 positions within the parsed string. 1247 1248 Example:: 1249 integer = Word(nums) 1250 date_str = integer + '/' + integer + '/' + integer 1251 1252 date_str.parseString("1999/12/31") # -> ['1999', '/', '12', '/', '31'] 1253 1254 # use parse action to convert to ints at parse time 1255 integer = Word(nums).setParseAction(lambda toks: int(toks[0])) 1256 date_str = integer + '/' + integer + '/' + integer 1257 1258 # note that integer fields are now ints, not strings 1259 date_str.parseString("1999/12/31") # -> [1999, '/', 12, '/', 31] 1260 """ 1261 self.parseAction = list(map(_trim_arity, list(fns))) 1262 self.callDuringTry = kwargs.get("callDuringTry", False) 1263 return self
1264
1265 - def addParseAction( self, *fns, **kwargs ):
1266 """ 1267 Add parse action to expression's list of parse actions. See L{I{setParseAction}<setParseAction>}. 1268 1269 See examples in L{I{copy}<copy>}. 1270 """ 1271 self.parseAction += list(map(_trim_arity, list(fns))) 1272 self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False) 1273 return self
1274
1275 - def addCondition(self, *fns, **kwargs):
1276 """Add a boolean predicate function to expression's list of parse actions. See 1277 L{I{setParseAction}<setParseAction>} for function call signatures. Unlike C{setParseAction}, 1278 functions passed to C{addCondition} need to return boolean success/fail of the condition. 1279 1280 Optional keyword arguments: 1281 - message = define a custom message to be used in the raised exception 1282 - fatal = if True, will raise ParseFatalException to stop parsing immediately; otherwise will raise ParseException 1283 1284 Example:: 1285 integer = Word(nums).setParseAction(lambda toks: int(toks[0])) 1286 year_int = integer.copy() 1287 year_int.addCondition(lambda toks: toks[0] >= 2000, message="Only support years 2000 and later") 1288 date_str = year_int + '/' + integer + '/' + integer 1289 1290 result = date_str.parseString("1999/12/31") # -> Exception: Only support years 2000 and later (at char 0), (line:1, col:1) 1291 """ 1292 msg = kwargs.get("message", "failed user-defined condition") 1293 exc_type = ParseFatalException if kwargs.get("fatal", False) else ParseException 1294 for fn in fns: 1295 def pa(s,l,t): 1296 if not bool(_trim_arity(fn)(s,l,t)): 1297 raise exc_type(s,l,msg)
1298 self.parseAction.append(pa) 1299 self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False) 1300 return self 1301
1302 - def setFailAction( self, fn ):
1303 """Define action to perform if parsing fails at this expression. 1304 Fail acton fn is a callable function that takes the arguments 1305 C{fn(s,loc,expr,err)} where: 1306 - s = string being parsed 1307 - loc = location where expression match was attempted and failed 1308 - expr = the parse expression that failed 1309 - err = the exception thrown 1310 The function returns no value. It may throw C{L{ParseFatalException}} 1311 if it is desired to stop parsing immediately.""" 1312 self.failAction = fn 1313 return self
1314
1315 - def _skipIgnorables( self, instring, loc ):
1316 exprsFound = True 1317 while exprsFound: 1318 exprsFound = False 1319 for e in self.ignoreExprs: 1320 try: 1321 while 1: 1322 loc,dummy = e._parse( instring, loc ) 1323 exprsFound = True 1324 except ParseException: 1325 pass 1326 return loc
1327
1328 - def preParse( self, instring, loc ):
1329 if self.ignoreExprs: 1330 loc = self._skipIgnorables( instring, loc ) 1331 1332 if self.skipWhitespace: 1333 wt = self.whiteChars 1334 instrlen = len(instring) 1335 while loc < instrlen and instring[loc] in wt: 1336 loc += 1 1337 1338 return loc
1339
1340 - def parseImpl( self, instring, loc, doActions=True ):
1341 return loc, []
1342
1343 - def postParse( self, instring, loc, tokenlist ):
1344 return tokenlist
1345 1346 #~ @profile
1347 - def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ):
1348 debugging = ( self.debug ) #and doActions ) 1349 1350 if debugging or self.failAction: 1351 #~ print ("Match",self,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )) 1352 if (self.debugActions[0] ): 1353 self.debugActions[0]( instring, loc, self ) 1354 if callPreParse and self.callPreparse: 1355 preloc = self.preParse( instring, loc ) 1356 else: 1357 preloc = loc 1358 tokensStart = preloc 1359 try: 1360 try: 1361 loc,tokens = self.parseImpl( instring, preloc, doActions ) 1362 except IndexError: 1363 raise ParseException( instring, len(instring), self.errmsg, self ) 1364 except ParseBaseException as err: 1365 #~ print ("Exception raised:", err) 1366 if self.debugActions[2]: 1367 self.debugActions[2]( instring, tokensStart, self, err ) 1368 if self.failAction: 1369 self.failAction( instring, tokensStart, self, err ) 1370 raise 1371 else: 1372 if callPreParse and self.callPreparse: 1373 preloc = self.preParse( instring, loc ) 1374 else: 1375 preloc = loc 1376 tokensStart = preloc 1377 if self.mayIndexError or loc >= len(instring): 1378 try: 1379 loc,tokens = self.parseImpl( instring, preloc, doActions ) 1380 except IndexError: 1381 raise ParseException( instring, len(instring), self.errmsg, self ) 1382 else: 1383 loc,tokens = self.parseImpl( instring, preloc, doActions ) 1384 1385 tokens = self.postParse( instring, loc, tokens ) 1386 1387 retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults ) 1388 if self.parseAction and (doActions or self.callDuringTry): 1389 if debugging: 1390 try: 1391 for fn in self.parseAction: 1392 tokens = fn( instring, tokensStart, retTokens ) 1393 if tokens is not None: 1394 retTokens = ParseResults( tokens, 1395 self.resultsName, 1396 asList=self.saveAsList and isinstance(tokens,(ParseResults,list)), 1397 modal=self.modalResults ) 1398 except ParseBaseException as err: 1399 #~ print "Exception raised in user parse action:", err 1400 if (self.debugActions[2] ): 1401 self.debugActions[2]( instring, tokensStart, self, err ) 1402 raise 1403 else: 1404 for fn in self.parseAction: 1405 tokens = fn( instring, tokensStart, retTokens ) 1406 if tokens is not None: 1407 retTokens = ParseResults( tokens, 1408 self.resultsName, 1409 asList=self.saveAsList and isinstance(tokens,(ParseResults,list)), 1410 modal=self.modalResults ) 1411 1412 if debugging: 1413 #~ print ("Matched",self,"->",retTokens.asList()) 1414 if (self.debugActions[1] ): 1415 self.debugActions[1]( instring, tokensStart, loc, self, retTokens ) 1416 1417 return loc, retTokens
1418
1419 - def tryParse( self, instring, loc ):
1420 try: 1421 return self._parse( instring, loc, doActions=False )[0] 1422 except ParseFatalException: 1423 raise ParseException( instring, loc, self.errmsg, self)
1424
1425 - def canParseNext(self, instring, loc):
1426 try: 1427 self.tryParse(instring, loc) 1428 except (ParseException, IndexError): 1429 return False 1430 else: 1431 return True
1432
1433 - class _UnboundedCache(object):
1434 - def __init__(self):
1435 cache = {} 1436 self.not_in_cache = not_in_cache = object() 1437 1438 def get(self, key): 1439 return cache.get(key, not_in_cache)
1440 1441 def set(self, key, value): 1442 cache[key] = value
1443 1444 def clear(self): 1445 cache.clear() 1446 1447 self.get = types.MethodType(get, self) 1448 self.set = types.MethodType(set, self) 1449 self.clear = types.MethodType(clear, self) 1450 1451 if _OrderedDict is not None:
1452 - class _FifoCache(object):
1453 - def __init__(self, size):
1454 self.not_in_cache = not_in_cache = object() 1455 1456 cache = _OrderedDict() 1457 1458 def get(self, key): 1459 return cache.get(key, not_in_cache)
1460 1461 def set(self, key, value): 1462 cache[key] = value 1463 if len(cache) > size: 1464 cache.popitem(False)
1465 1466 def clear(self): 1467 cache.clear() 1468 1469 self.get = types.MethodType(get, self) 1470 self.set = types.MethodType(set, self) 1471 self.clear = types.MethodType(clear, self) 1472 1473 else:
1474 - class _FifoCache(object):
1475 - def __init__(self, size):
1476 self.not_in_cache = not_in_cache = object() 1477 1478 cache = {} 1479 key_fifo = collections.deque([], size) 1480 1481 def get(self, key): 1482 return cache.get(key, not_in_cache)
1483 1484 def set(self, key, value): 1485 cache[key] = value 1486 if len(cache) > size: 1487 cache.pop(key_fifo.popleft(), None) 1488 key_fifo.append(key)
1489 1490 def clear(self): 1491 cache.clear() 1492 key_fifo.clear() 1493 1494 self.get = types.MethodType(get, self) 1495 self.set = types.MethodType(set, self) 1496 self.clear = types.MethodType(clear, self) 1497 1498 # argument cache for optimizing repeated calls when backtracking through recursive expressions 1499 packrat_cache = {} # this is set later by enabledPackrat(); this is here so that resetCache() doesn't fail 1500 packrat_cache_lock = RLock() 1501 packrat_cache_stats = [0, 0] 1502 1503 # this method gets repeatedly called during backtracking with the same arguments - 1504 # we can cache these arguments and save ourselves the trouble of re-parsing the contained expression
1505 - def _parseCache( self, instring, loc, doActions=True, callPreParse=True ):
1506 HIT, MISS = 0, 1 1507 lookup = (self, instring, loc, callPreParse, doActions) 1508 with ParserElement.packrat_cache_lock: 1509 cache = ParserElement.packrat_cache 1510 value = cache.get(lookup) 1511 if value is cache.not_in_cache: 1512 ParserElement.packrat_cache_stats[MISS] += 1 1513 try: 1514 value = self._parseNoCache(instring, loc, doActions, callPreParse) 1515 except ParseBaseException as pe: 1516 # cache a copy of the exception, without the traceback 1517 cache.set(lookup, pe.__class__(*pe.args)) 1518 raise 1519 else: 1520 cache.set(lookup, (value[0], value[1].copy())) 1521 return value 1522 else: 1523 ParserElement.packrat_cache_stats[HIT] += 1 1524 if isinstance(value, Exception): 1525 raise value 1526 return (value[0], value[1].copy())
1527 1528 _parse = _parseNoCache 1529 1530 @staticmethod
1531 - def resetCache():
1534 1535 _packratEnabled = False 1536 @staticmethod
1537 - def enablePackrat(cache_size_limit=128):
1538 """Enables "packrat" parsing, which adds memoizing to the parsing logic. 1539 Repeated parse attempts at the same string location (which happens 1540 often in many complex grammars) can immediately return a cached value, 1541 instead of re-executing parsing/validating code. Memoizing is done of 1542 both valid results and parsing exceptions. 1543 1544 Parameters: 1545 - cache_size_limit - (default=C{128}) - if an integer value is provided 1546 will limit the size of the packrat cache; if None is passed, then 1547 the cache size will be unbounded; if 0 is passed, the cache will 1548 be effectively disabled. 1549 1550 This speedup may break existing programs that use parse actions that 1551 have side-effects. For this reason, packrat parsing is disabled when 1552 you first import pyparsing. To activate the packrat feature, your 1553 program must call the class method C{ParserElement.enablePackrat()}. If 1554 your program uses C{psyco} to "compile as you go", you must call 1555 C{enablePackrat} before calling C{psyco.full()}. If you do not do this, 1556 Python will crash. For best results, call C{enablePackrat()} immediately 1557 after importing pyparsing. 1558 1559 Example:: 1560 import pyparsing 1561 pyparsing.ParserElement.enablePackrat() 1562 """ 1563 if not ParserElement._packratEnabled: 1564 ParserElement._packratEnabled = True 1565 if cache_size_limit is None: 1566 ParserElement.packrat_cache = ParserElement._UnboundedCache() 1567 else: 1568 ParserElement.packrat_cache = ParserElement._FifoCache(cache_size_limit) 1569 ParserElement._parse = ParserElement._parseCache
1570
1571 - def parseString( self, instring, parseAll=False ):
1572 """ 1573 Execute the parse expression with the given string. 1574 This is the main interface to the client code, once the complete 1575 expression has been built. 1576 1577 If you want the grammar to require that the entire input string be 1578 successfully parsed, then set C{parseAll} to True (equivalent to ending 1579 the grammar with C{L{StringEnd()}}). 1580 1581 Note: C{parseString} implicitly calls C{expandtabs()} on the input string, 1582 in order to report proper column numbers in parse actions. 1583 If the input string contains tabs and 1584 the grammar uses parse actions that use the C{loc} argument to index into the 1585 string being parsed, you can ensure you have a consistent view of the input 1586 string by: 1587 - calling C{parseWithTabs} on your grammar before calling C{parseString} 1588 (see L{I{parseWithTabs}<parseWithTabs>}) 1589 - define your parse action using the full C{(s,loc,toks)} signature, and 1590 reference the input string using the parse action's C{s} argument 1591 - explictly expand the tabs in your input string before calling 1592 C{parseString} 1593 1594 Example:: 1595 Word('a').parseString('aaaaabaaa') # -> ['aaaaa'] 1596 Word('a').parseString('aaaaabaaa', parseAll=True) # -> Exception: Expected end of text 1597 """ 1598 ParserElement.resetCache() 1599 if not self.streamlined: 1600 self.streamline() 1601 #~ self.saveAsList = True 1602 for e in self.ignoreExprs: 1603 e.streamline() 1604 if not self.keepTabs: 1605 instring = instring.expandtabs() 1606 try: 1607 loc, tokens = self._parse( instring, 0 ) 1608 if parseAll: 1609 loc = self.preParse( instring, loc ) 1610 se = Empty() + StringEnd() 1611 se._parse( instring, loc ) 1612 except ParseBaseException as exc: 1613 if ParserElement.verbose_stacktrace: 1614 raise 1615 else: 1616 # catch and re-raise exception from here, clears out pyparsing internal stack trace 1617 raise exc 1618 else: 1619 return tokens
1620
1621 - def scanString( self, instring, maxMatches=_MAX_INT, overlap=False ):
1622 """ 1623 Scan the input string for expression matches. Each match will return the 1624 matching tokens, start location, and end location. May be called with optional 1625 C{maxMatches} argument, to clip scanning after 'n' matches are found. If 1626 C{overlap} is specified, then overlapping matches will be reported. 1627 1628 Note that the start and end locations are reported relative to the string 1629 being parsed. See L{I{parseString}<parseString>} for more information on parsing 1630 strings with embedded tabs. 1631 1632 Example:: 1633 source = "sldjf123lsdjjkf345sldkjf879lkjsfd987" 1634 print(source) 1635 for tokens,start,end in Word(alphas).scanString(source): 1636 print(' '*start + '^'*(end-start)) 1637 print(' '*start + tokens[0]) 1638 1639 prints:: 1640 1641 sldjf123lsdjjkf345sldkjf879lkjsfd987 1642 ^^^^^ 1643 sldjf 1644 ^^^^^^^ 1645 lsdjjkf 1646 ^^^^^^ 1647 sldkjf 1648 ^^^^^^ 1649 lkjsfd 1650 """ 1651 if not self.streamlined: 1652 self.streamline() 1653 for e in self.ignoreExprs: 1654 e.streamline() 1655 1656 if not self.keepTabs: 1657 instring = _ustr(instring).expandtabs() 1658 instrlen = len(instring) 1659 loc = 0 1660 preparseFn = self.preParse 1661 parseFn = self._parse 1662 ParserElement.resetCache() 1663 matches = 0 1664 try: 1665 while loc <= instrlen and matches < maxMatches: 1666 try: 1667 preloc = preparseFn( instring, loc ) 1668 nextLoc,tokens = parseFn( instring, preloc, callPreParse=False ) 1669 except ParseException: 1670 loc = preloc+1 1671 else: 1672 if nextLoc > loc: 1673 matches += 1 1674 yield tokens, preloc, nextLoc 1675 if overlap: 1676 nextloc = preparseFn( instring, loc ) 1677 if nextloc > loc: 1678 loc = nextLoc 1679 else: 1680 loc += 1 1681 else: 1682 loc = nextLoc 1683 else: 1684 loc = preloc+1 1685 except ParseBaseException as exc: 1686 if ParserElement.verbose_stacktrace: 1687 raise 1688 else: 1689 # catch and re-raise exception from here, clears out pyparsing internal stack trace 1690 raise exc
1691
1692 - def transformString( self, instring ):
1693 """ 1694 Extension to C{L{scanString}}, to modify matching text with modified tokens that may 1695 be returned from a parse action. To use C{transformString}, define a grammar and 1696 attach a parse action to it that modifies the returned token list. 1697 Invoking C{transformString()} on a target string will then scan for matches, 1698 and replace the matched text patterns according to the logic in the parse 1699 action. C{transformString()} returns the resulting transformed string. 1700 1701 Example:: 1702 wd = Word(alphas) 1703 wd.setParseAction(lambda toks: toks[0].title()) 1704 1705 print(wd.transformString("now is the winter of our discontent made glorious summer by this sun of york.")) 1706 Prints:: 1707 Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York. 1708 """ 1709 out = [] 1710 lastE = 0 1711 # force preservation of <TAB>s, to minimize unwanted transformation of string, and to 1712 # keep string locs straight between transformString and scanString 1713 self.keepTabs = True 1714 try: 1715 for t,s,e in self.scanString( instring ): 1716 out.append( instring[lastE:s] ) 1717 if t: 1718 if isinstance(t,ParseResults): 1719 out += t.asList() 1720 elif isinstance(t,list): 1721 out += t 1722 else: 1723 out.append(t) 1724 lastE = e 1725 out.append(instring[lastE:]) 1726 out = [o for o in out if o] 1727 return "".join(map(_ustr,_flatten(out))) 1728 except ParseBaseException as exc: 1729 if ParserElement.verbose_stacktrace: 1730 raise 1731 else: 1732 # catch and re-raise exception from here, clears out pyparsing internal stack trace 1733 raise exc
1734
1735 - def searchString( self, instring, maxMatches=_MAX_INT ):
1736 """ 1737 Another extension to C{L{scanString}}, simplifying the access to the tokens found 1738 to match the given parse expression. May be called with optional 1739 C{maxMatches} argument, to clip searching after 'n' matches are found. 1740 1741 Example:: 1742 # a capitalized word starts with an uppercase letter, followed by zero or more lowercase letters 1743 cap_word = Word(alphas.upper(), alphas.lower()) 1744 1745 print(cap_word.searchString("More than Iron, more than Lead, more than Gold I need Electricity")) 1746 prints:: 1747 ['More', 'Iron', 'Lead', 'Gold', 'I'] 1748 """ 1749 try: 1750 return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ]) 1751 except ParseBaseException as exc: 1752 if ParserElement.verbose_stacktrace: 1753 raise 1754 else: 1755 # catch and re-raise exception from here, clears out pyparsing internal stack trace 1756 raise exc
1757
1758 - def split(self, instring, maxsplit=_MAX_INT, includeSeparators=False):
1759 """ 1760 Generator method to split a string using the given expression as a separator. 1761 May be called with optional C{maxsplit} argument, to limit the number of splits; 1762 and the optional C{includeSeparators} argument (default=C{False}), if the separating 1763 matching text should be included in the split results. 1764 1765 Example:: 1766 punc = oneOf(list(".,;:/-!?")) 1767 print(list(punc.split("This, this?, this sentence, is badly punctuated!"))) 1768 prints:: 1769 ['This', ' this', '', ' this sentence', ' is badly punctuated', ''] 1770 """ 1771 splits = 0 1772 last = 0 1773 for t,s,e in self.scanString(instring, maxMatches=maxsplit): 1774 yield instring[last:s] 1775 if includeSeparators: 1776 yield t[0] 1777 last = e 1778 yield instring[last:]
1779
1780 - def __add__(self, other ):
1781 """ 1782 Implementation of + operator - returns C{L{And}}. Adding strings to a ParserElement 1783 converts them to L{Literal}s by default. 1784 1785 Example:: 1786 greet = Word(alphas) + "," + Word(alphas) + "!" 1787 hello = "Hello, World!" 1788 print (hello, "->", greet.parseString(hello)) 1789 Prints:: 1790 Hello, World! -> ['Hello', ',', 'World', '!'] 1791 """ 1792 if isinstance( other, basestring ): 1793 other = ParserElement._literalStringClass( other ) 1794 if not isinstance( other, ParserElement ): 1795 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1796 SyntaxWarning, stacklevel=2) 1797 return None 1798 return And( [ self, other ] )
1799
1800 - def __radd__(self, other ):
1801 """ 1802 Implementation of + operator when left operand is not a C{L{ParserElement}} 1803 """ 1804 if isinstance( other, basestring ): 1805 other = ParserElement._literalStringClass( other ) 1806 if not isinstance( other, ParserElement ): 1807 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1808 SyntaxWarning, stacklevel=2) 1809 return None 1810 return other + self
1811
1812 - def __sub__(self, other):
1813 """ 1814 Implementation of - operator, returns C{L{And}} with error stop 1815 """ 1816 if isinstance( other, basestring ): 1817 other = ParserElement._literalStringClass( other ) 1818 if not isinstance( other, ParserElement ): 1819 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1820 SyntaxWarning, stacklevel=2) 1821 return None 1822 return And( [ self, And._ErrorStop(), other ] )
1823
1824 - def __rsub__(self, other ):
1825 """ 1826 Implementation of - operator when left operand is not a C{L{ParserElement}} 1827 """ 1828 if isinstance( other, basestring ): 1829 other = ParserElement._literalStringClass( other ) 1830 if not isinstance( other, ParserElement ): 1831 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1832 SyntaxWarning, stacklevel=2) 1833 return None 1834 return other - self
1835
1836 - def __mul__(self,other):
1837 """ 1838 Implementation of * operator, allows use of C{expr * 3} in place of 1839 C{expr + expr + expr}. Expressions may also me multiplied by a 2-integer 1840 tuple, similar to C{{min,max}} multipliers in regular expressions. Tuples 1841 may also include C{None} as in: 1842 - C{expr*(n,None)} or C{expr*(n,)} is equivalent 1843 to C{expr*n + L{ZeroOrMore}(expr)} 1844 (read as "at least n instances of C{expr}") 1845 - C{expr*(None,n)} is equivalent to C{expr*(0,n)} 1846 (read as "0 to n instances of C{expr}") 1847 - C{expr*(None,None)} is equivalent to C{L{ZeroOrMore}(expr)} 1848 - C{expr*(1,None)} is equivalent to C{L{OneOrMore}(expr)} 1849 1850 Note that C{expr*(None,n)} does not raise an exception if 1851 more than n exprs exist in the input stream; that is, 1852 C{expr*(None,n)} does not enforce a maximum number of expr 1853 occurrences. If this behavior is desired, then write 1854 C{expr*(None,n) + ~expr} 1855 """ 1856 if isinstance(other,int): 1857 minElements, optElements = other,0 1858 elif isinstance(other,tuple): 1859 other = (other + (None, None))[:2] 1860 if other[0] is None: 1861 other = (0, other[1]) 1862 if isinstance(other[0],int) and other[1] is None: 1863 if other[0] == 0: 1864 return ZeroOrMore(self) 1865 if other[0] == 1: 1866 return OneOrMore(self) 1867 else: 1868 return self*other[0] + ZeroOrMore(self) 1869 elif isinstance(other[0],int) and isinstance(other[1],int): 1870 minElements, optElements = other 1871 optElements -= minElements 1872 else: 1873 raise TypeError("cannot multiply 'ParserElement' and ('%s','%s') objects", type(other[0]),type(other[1])) 1874 else: 1875 raise TypeError("cannot multiply 'ParserElement' and '%s' objects", type(other)) 1876 1877 if minElements < 0: 1878 raise ValueError("cannot multiply ParserElement by negative value") 1879 if optElements < 0: 1880 raise ValueError("second tuple value must be greater or equal to first tuple value") 1881 if minElements == optElements == 0: 1882 raise ValueError("cannot multiply ParserElement by 0 or (0,0)") 1883 1884 if (optElements): 1885 def makeOptionalList(n): 1886 if n>1: 1887 return Optional(self + makeOptionalList(n-1)) 1888 else: 1889 return Optional(self)
1890 if minElements: 1891 if minElements == 1: 1892 ret = self + makeOptionalList(optElements) 1893 else: 1894 ret = And([self]*minElements) + makeOptionalList(optElements) 1895 else: 1896 ret = makeOptionalList(optElements) 1897 else: 1898 if minElements == 1: 1899 ret = self 1900 else: 1901 ret = And([self]*minElements) 1902 return ret 1903
1904 - def __rmul__(self, other):
1905 return self.__mul__(other)
1906
1907 - def __or__(self, other ):
1908 """ 1909 Implementation of | operator - returns C{L{MatchFirst}} 1910 """ 1911 if isinstance( other, basestring ): 1912 other = ParserElement._literalStringClass( other ) 1913 if not isinstance( other, ParserElement ): 1914 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1915 SyntaxWarning, stacklevel=2) 1916 return None 1917 return MatchFirst( [ self, other ] )
1918
1919 - def __ror__(self, other ):
1920 """ 1921 Implementation of | operator when left operand is not a C{L{ParserElement}} 1922 """ 1923 if isinstance( other, basestring ): 1924 other = ParserElement._literalStringClass( other ) 1925 if not isinstance( other, ParserElement ): 1926 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1927 SyntaxWarning, stacklevel=2) 1928 return None 1929 return other | self
1930
1931 - def __xor__(self, other ):
1932 """ 1933 Implementation of ^ operator - returns C{L{Or}} 1934 """ 1935 if isinstance( other, basestring ): 1936 other = ParserElement._literalStringClass( other ) 1937 if not isinstance( other, ParserElement ): 1938 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1939 SyntaxWarning, stacklevel=2) 1940 return None 1941 return Or( [ self, other ] )
1942
1943 - def __rxor__(self, other ):
1944 """ 1945 Implementation of ^ operator when left operand is not a C{L{ParserElement}} 1946 """ 1947 if isinstance( other, basestring ): 1948 other = ParserElement._literalStringClass( other ) 1949 if not isinstance( other, ParserElement ): 1950 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1951 SyntaxWarning, stacklevel=2) 1952 return None 1953 return other ^ self
1954
1955 - def __and__(self, other ):
1956 """ 1957 Implementation of & operator - returns C{L{Each}} 1958 """ 1959 if isinstance( other, basestring ): 1960 other = ParserElement._literalStringClass( other ) 1961 if not isinstance( other, ParserElement ): 1962 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1963 SyntaxWarning, stacklevel=2) 1964 return None 1965 return Each( [ self, other ] )
1966
1967 - def __rand__(self, other ):
1968 """ 1969 Implementation of & operator when left operand is not a C{L{ParserElement}} 1970 """ 1971 if isinstance( other, basestring ): 1972 other = ParserElement._literalStringClass( other ) 1973 if not isinstance( other, ParserElement ): 1974 warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), 1975 SyntaxWarning, stacklevel=2) 1976 return None 1977 return other & self
1978
1979 - def __invert__( self ):
1980 """ 1981 Implementation of ~ operator - returns C{L{NotAny}} 1982 """ 1983 return NotAny( self )
1984
1985 - def __call__(self, name=None):
1986 """ 1987 Shortcut for C{L{setResultsName}}, with C{listAllMatches=False}. 1988 1989 If C{name} is given with a trailing C{'*'} character, then C{listAllMatches} will be 1990 passed as C{True}. 1991 1992 If C{name} is omitted, same as calling C{L{copy}}. 1993 1994 Example:: 1995 # these are equivalent 1996 userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno") 1997 userdata = Word(alphas)("name") + Word(nums+"-")("socsecno") 1998 """ 1999 if name is not None: 2000 return self.setResultsName(name) 2001 else: 2002 return self.copy()
2003
2004 - def suppress( self ):
2005 """ 2006 Suppresses the output of this C{ParserElement}; useful to keep punctuation from 2007 cluttering up returned output. 2008 """ 2009 return Suppress( self )
2010
2011 - def leaveWhitespace( self ):
2012 """ 2013 Disables the skipping of whitespace before matching the characters in the 2014 C{ParserElement}'s defined pattern. This is normally only used internally by 2015 the pyparsing module, but may be needed in some whitespace-sensitive grammars. 2016 """ 2017 self.skipWhitespace = False 2018 return self
2019
2020 - def setWhitespaceChars( self, chars ):
2021 """ 2022 Overrides the default whitespace chars 2023 """ 2024 self.skipWhitespace = True 2025 self.whiteChars = chars 2026 self.copyDefaultWhiteChars = False 2027 return self
2028
2029 - def parseWithTabs( self ):
2030 """ 2031 Overrides default behavior to expand C{<TAB>}s to spaces before parsing the input string. 2032 Must be called before C{parseString} when the input grammar contains elements that 2033 match C{<TAB>} characters. 2034 """ 2035 self.keepTabs = True 2036 return self
2037
2038 - def ignore( self, other ):
2039 """ 2040 Define expression to be ignored (e.g., comments) while doing pattern 2041 matching; may be called repeatedly, to define multiple comment or other 2042 ignorable patterns. 2043 2044 Example:: 2045 patt = OneOrMore(Word(alphas)) 2046 patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj'] 2047 2048 patt.ignore(cStyleComment) 2049 patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd'] 2050 """ 2051 if isinstance(other, basestring): 2052 other = Suppress(other) 2053 2054 if isinstance( other, Suppress ): 2055 if other not in self.ignoreExprs: 2056 self.ignoreExprs.append(other) 2057 else: 2058 self.ignoreExprs.append( Suppress( other.copy() ) ) 2059 return self
2060
2061 - def setDebugActions( self, startAction, successAction, exceptionAction ):
2062 """ 2063 Enable display of debugging messages while doing pattern matching. 2064 """ 2065 self.debugActions = (startAction or _defaultStartDebugAction, 2066 successAction or _defaultSuccessDebugAction, 2067 exceptionAction or _defaultExceptionDebugAction) 2068 self.debug = True 2069 return self
2070
2071 - def setDebug( self, flag=True ):
2072 """ 2073 Enable display of debugging messages while doing pattern matching. 2074 Set C{flag} to True to enable, False to disable. 2075 2076 Example:: 2077 wd = Word(alphas).setName("alphaword") 2078 integer = Word(nums).setName("numword") 2079 term = wd | integer 2080 2081 # turn on debugging for wd 2082 wd.setDebug() 2083 2084 OneOrMore(term).parseString("abc 123 xyz 890") 2085 2086 prints:: 2087 Match alphaword at loc 0(1,1) 2088 Matched alphaword -> ['abc'] 2089 Match alphaword at loc 3(1,4) 2090 Exception raised:Expected alphaword (at char 4), (line:1, col:5) 2091 Match alphaword at loc 7(1,8) 2092 Matched alphaword -> ['xyz'] 2093 Match alphaword at loc 11(1,12) 2094 Exception raised:Expected alphaword (at char 12), (line:1, col:13) 2095 Match alphaword at loc 15(1,16) 2096 Exception raised:Expected alphaword (at char 15), (line:1, col:16) 2097 2098 The output shown is that produced by the default debug actions - custom debug actions can be 2099 specified using L{setDebugActions}. Prior to attempting 2100 to match the C{wd} expression, the debugging message C{"Match <exprname> at loc <n>(<line>,<col>)"} 2101 is shown. Then if the parse succeeds, a C{"Matched"} message is shown, or an C{"Exception raised"} 2102 message is shown. Also note the use of L{setName} to assign a human-readable name to the expression, 2103 which makes debugging and exception messages easier to understand - for instance, the default 2104 name created for the C{Word} expression without calling C{setName} is C{"W:(ABCD...)"}. 2105 """ 2106 if flag: 2107 self.setDebugActions( _defaultStartDebugAction, _defaultSuccessDebugAction, _defaultExceptionDebugAction ) 2108 else: 2109 self.debug = False 2110 return self
2111
2112 - def __str__( self ):
2113 return self.name
2114
2115 - def __repr__( self ):
2116 return _ustr(self)
2117
2118 - def streamline( self ):
2119 self.streamlined = True 2120 self.strRepr = None 2121 return self
2122
2123 - def checkRecursion( self, parseElementList ):
2124 pass
2125
2126 - def validate( self, validateTrace=[] ):
2127 """ 2128 Check defined expressions for valid structure, check for infinite recursive definitions. 2129 """ 2130 self.checkRecursion( [] )
2131
2132 - def parseFile( self, file_or_filename, parseAll=False ):
2133 """ 2134 Execute the parse expression on the given file or filename. 2135 If a filename is specified (instead of a file object), 2136 the entire file is opened, read, and closed before parsing. 2137 """ 2138 try: 2139 file_contents = file_or_filename.read() 2140 except AttributeError: 2141 with open(file_or_filename, "r") as f: 2142 file_contents = f.read() 2143 try: 2144 return self.parseString(file_contents, parseAll) 2145 except ParseBaseException as exc: 2146 if ParserElement.verbose_stacktrace: 2147 raise 2148 else: 2149 # catch and re-raise exception from here, clears out pyparsing internal stack trace 2150 raise exc
2151
2152 - def __eq__(self,other):
2153 if isinstance(other, ParserElement): 2154 return self is other or vars(self) == vars(other) 2155 elif isinstance(other, basestring): 2156 return self.matches(other) 2157 else: 2158 return super(ParserElement,self)==other
2159
2160 - def __ne__(self,other):
2161 return not (self == other)
2162
2163 - def __hash__(self):
2164 return hash(id(self))
2165
2166 - def __req__(self,other):
2167 return self == other
2168
2169 - def __rne__(self,other):
2170 return not (self == other)
2171
2172 - def matches(self, testString, parseAll=True):
2173 """ 2174 Method for quick testing of a parser against a test string. Good for simple 2175 inline microtests of sub expressions while building up larger parser. 2176 2177 Parameters: 2178 - testString - to test against this expression for a match 2179 - parseAll - (default=C{True}) - flag to pass to C{L{parseString}} when running tests 2180 2181 Example:: 2182 expr = Word(nums) 2183 assert expr.matches("100") 2184 """ 2185 try: 2186 self.parseString(_ustr(testString), parseAll=parseAll) 2187 return True 2188 except ParseBaseException: 2189 return False
2190
2191 - def runTests(self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False):
2192 """ 2193 Execute the parse expression on a series of test strings, showing each 2194 test, the parsed results or where the parse failed. Quick and easy way to 2195 run a parse expression against a list of sample strings. 2196 2197 Parameters: 2198 - tests - a list of separate test strings, or a multiline string of test strings 2199 - parseAll - (default=C{True}) - flag to pass to C{L{parseString}} when running tests 2200 - comment - (default=C{'#'}) - expression for indicating embedded comments in the test 2201 string; pass None to disable comment filtering 2202 - fullDump - (default=C{True}) - dump results as list followed by results names in nested outline; 2203 if False, only dump nested list 2204 - printResults - (default=C{True}) prints test output to stdout 2205 - failureTests - (default=C{False}) indicates if these tests are expected to fail parsing 2206 2207 Returns: a (success, results) tuple, where success indicates that all tests succeeded 2208 (or failed if C{failureTests} is True), and the results contain a list of lines of each 2209 test's output 2210 2211 Example:: 2212 number_expr = pyparsing_common.number.copy() 2213 2214 result = number_expr.runTests(''' 2215 # unsigned integer 2216 100 2217 # negative integer 2218 -100 2219 # float with scientific notation 2220 6.02e23 2221 # integer with scientific notation 2222 1e-12 2223 ''') 2224 print("Success" if result[0] else "Failed!") 2225 2226 result = number_expr.runTests(''' 2227 # stray character 2228 100Z 2229 # missing leading digit before '.' 2230 -.100 2231 # too many '.' 2232 3.14.159 2233 ''', failureTests=True) 2234 print("Success" if result[0] else "Failed!") 2235 prints:: 2236 # unsigned integer 2237 100 2238 [100] 2239 2240 # negative integer 2241 -100 2242 [-100] 2243 2244 # float with scientific notation 2245 6.02e23 2246 [6.02e+23] 2247 2248 # integer with scientific notation 2249 1e-12 2250 [1e-12] 2251 2252 Success 2253 2254 # stray character 2255 100Z 2256 ^ 2257 FAIL: Expected end of text (at char 3), (line:1, col:4) 2258 2259 # missing leading digit before '.' 2260 -.100 2261 ^ 2262 FAIL: Expected {real number with scientific notation | real number | signed integer} (at char 0), (line:1, col:1) 2263 2264 # too many '.' 2265 3.14.159 2266 ^ 2267 FAIL: Expected end of text (at char 4), (line:1, col:5) 2268 2269 Success 2270 2271 Each test string must be on a single line. If you want to test a string that spans multiple 2272 lines, create a test like this:: 2273 2274 expr.runTest(r"this is a test\\n of strings that spans \\n 3 lines") 2275 2276 (Note that this is a raw string literal, you must include the leading 'r'.) 2277 """ 2278 if isinstance(tests, basestring): 2279 tests = list(map(str.strip, tests.rstrip().splitlines())) 2280 if isinstance(comment, basestring): 2281 comment = Literal(comment) 2282 allResults = [] 2283 comments = [] 2284 success = True 2285 for t in tests: 2286 if comment is not None and comment.matches(t, False) or comments and not t: 2287 comments.append(t) 2288 continue 2289 if not t: 2290 continue 2291 out = ['\n'.join(comments), t] 2292 comments = [] 2293 try: 2294 t = t.replace(r'\n','\n') 2295 result = self.parseString(t, parseAll=parseAll) 2296 out.append(result.dump(full=fullDump)) 2297 success = success and not failureTests 2298 except ParseBaseException as pe: 2299 fatal = "(FATAL)" if isinstance(pe, ParseFatalException) else "" 2300 if '\n' in t: 2301 out.append(line(pe.loc, t)) 2302 out.append(' '*(col(pe.loc,t)-1) + '^' + fatal) 2303 else: 2304 out.append(' '*pe.loc + '^' + fatal) 2305 out.append("FAIL: " + str(pe)) 2306 success = success and failureTests 2307 result = pe 2308 except Exception as exc: 2309 out.append("FAIL-EXCEPTION: " + str(exc)) 2310 success = success and failureTests 2311 result = exc 2312 2313 if printResults: 2314 if fullDump: 2315 out.append('') 2316 print('\n'.join(out)) 2317 2318 allResults.append((t, result)) 2319 2320 return success, allResults
2321
2322 2323 -class Token(ParserElement):
2324 """ 2325 Abstract C{ParserElement} subclass, for defining atomic matching patterns. 2326 """
2327 - def __init__( self ):
2328 super(Token,self).__init__( savelist=False )
2329
2330 2331 -class Empty(Token):
2332 """ 2333 An empty token, will always match. 2334 """
2335 - def __init__( self ):
2336 super(Empty,self).__init__() 2337 self.name = "Empty" 2338 self.mayReturnEmpty = True 2339 self.mayIndexError = False
2340
2341 2342 -class NoMatch(Token):
2343 """ 2344 A token that will never match. 2345 """
2346 - def __init__( self ):
2347 super(NoMatch,self).__init__() 2348 self.name = "NoMatch" 2349 self.mayReturnEmpty = True 2350 self.mayIndexError = False 2351 self.errmsg = "Unmatchable token"
2352
2353 - def parseImpl( self, instring, loc, doActions=True ):
2354 raise ParseException(instring, loc, self.errmsg, self)
2355
2356 2357 -class Literal(Token):
2358 """ 2359 Token to exactly match a specified string. 2360 2361 Example:: 2362 Literal('blah').parseString('blah') # -> ['blah'] 2363 Literal('blah').parseString('blahfooblah') # -> ['blah'] 2364 Literal('blah').parseString('bla') # -> Exception: Expected "blah" 2365 2366 For case-insensitive matching, use L{CaselessLiteral}. 2367 2368 For keyword matching (force word break before and after the matched string), 2369 use L{Keyword} or L{CaselessKeyword}. 2370 """
2371 - def __init__( self, matchString ):
2372 super(Literal,self).__init__() 2373 self.match = matchString 2374 self.matchLen = len(matchString) 2375 try: 2376 self.firstMatchChar = matchString[0] 2377 except IndexError: 2378 warnings.warn("null string passed to Literal; use Empty() instead", 2379 SyntaxWarning, stacklevel=2) 2380 self.__class__ = Empty 2381 self.name = '"%s"' % _ustr(self.match) 2382 self.errmsg = "Expected " + self.name 2383 self.mayReturnEmpty = False 2384 self.mayIndexError = False
2385 2386 # Performance tuning: this routine gets called a *lot* 2387 # if this is a single character match string and the first character matches, 2388 # short-circuit as quickly as possible, and avoid calling startswith 2389 #~ @profile
2390 - def parseImpl( self, instring, loc, doActions=True ):
2391 if (instring[loc] == self.firstMatchChar and 2392 (self.matchLen==1 or instring.startswith(self.match,loc)) ): 2393 return loc+self.matchLen, self.match 2394 raise ParseException(instring, loc, self.errmsg, self)
2395 _L = Literal 2396 ParserElement._literalStringClass = Literal
2397 2398 -class Keyword(Token):
2399 """ 2400 Token to exactly match a specified string as a keyword, that is, it must be 2401 immediately followed by a non-keyword character. Compare with C{L{Literal}}: 2402 - C{Literal("if")} will match the leading C{'if'} in C{'ifAndOnlyIf'}. 2403 - C{Keyword("if")} will not; it will only match the leading C{'if'} in C{'if x=1'}, or C{'if(y==2)'} 2404 Accepts two optional constructor arguments in addition to the keyword string: 2405 - C{identChars} is a string of characters that would be valid identifier characters, 2406 defaulting to all alphanumerics + "_" and "$" 2407 - C{caseless} allows case-insensitive matching, default is C{False}. 2408 2409 Example:: 2410 Keyword("start").parseString("start") # -> ['start'] 2411 Keyword("start").parseString("starting") # -> Exception 2412 2413 For case-insensitive matching, use L{CaselessKeyword}. 2414 """ 2415 DEFAULT_KEYWORD_CHARS = alphanums+"_$" 2416
2417 - def __init__( self, matchString, identChars=None, caseless=False ):
2418 super(Keyword,self).__init__() 2419 if identChars is None: 2420 identChars = Keyword.DEFAULT_KEYWORD_CHARS 2421 self.match = matchString 2422 self.matchLen = len(matchString) 2423 try: 2424 self.firstMatchChar = matchString[0] 2425 except IndexError: 2426 warnings.warn("null string passed to Keyword; use Empty() instead", 2427 SyntaxWarning, stacklevel=2) 2428 self.name = '"%s"' % self.match 2429 self.errmsg = "Expected " + self.name 2430 self.mayReturnEmpty = False 2431 self.mayIndexError = False 2432 self.caseless = caseless 2433 if caseless: 2434 self.caselessmatch = matchString.upper() 2435 identChars = identChars.upper() 2436 self.identChars = set(identChars)
2437
2438 - def parseImpl( self, instring, loc, doActions=True ):
2439 if self.caseless: 2440 if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and 2441 (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) and 2442 (loc == 0 or instring[loc-1].upper() not in self.identChars) ): 2443 return loc+self.matchLen, self.match 2444 else: 2445 if (instring[loc] == self.firstMatchChar and 2446 (self.matchLen==1 or instring.startswith(self.match,loc)) and 2447 (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen] not in self.identChars) and 2448 (loc == 0 or instring[loc-1] not in self.identChars) ): 2449 return loc+self.matchLen, self.match 2450 raise ParseException(instring, loc, self.errmsg, self)
2451
2452 - def copy(self):
2453 c = super(Keyword,self).copy() 2454 c.identChars = Keyword.DEFAULT_KEYWORD_CHARS 2455 return c
2456 2457 @staticmethod
2458 - def setDefaultKeywordChars( chars ):
2459 """Overrides the default Keyword chars 2460 """ 2461 Keyword.DEFAULT_KEYWORD_CHARS = chars
2462
2463 -class CaselessLiteral(Literal):
2464 """ 2465 Token to match a specified string, ignoring case of letters. 2466 Note: the matched results will always be in the case of the given 2467 match string, NOT the case of the input text. 2468 2469 Example:: 2470 OneOrMore(CaselessLiteral("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD', 'CMD'] 2471 2472 (Contrast with example for L{CaselessKeyword}.) 2473 """
2474 - def __init__( self, matchString ):
2475 super(CaselessLiteral,self).__init__( matchString.upper() ) 2476 # Preserve the defining literal. 2477 self.returnString = matchString 2478 self.name = "'%s'" % self.returnString 2479 self.errmsg = "Expected " + self.name
2480
2481 - def parseImpl( self, instring, loc, doActions=True ):
2482 if instring[ loc:loc+self.matchLen ].upper() == self.match: 2483 return loc+self.matchLen, self.returnString 2484 raise ParseException(instring, loc, self.errmsg, self)
2485
2486 -class CaselessKeyword(Keyword):
2487 """ 2488 Caseless version of L{Keyword}. 2489 2490 Example:: 2491 OneOrMore(CaselessKeyword("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD'] 2492 2493 (Contrast with example for L{CaselessLiteral}.) 2494 """
2495 - def __init__( self, matchString, identChars=None ):
2496 super(CaselessKeyword,self).__init__( matchString, identChars, caseless=True )
2497
2498 - def parseImpl( self, instring, loc, doActions=True ):
2499 if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and 2500 (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) ): 2501 return loc+self.matchLen, self.match 2502 raise ParseException(instring, loc, self.errmsg, self)
2503
2504 -class CloseMatch(Token):
2505 """ 2506 A variation on L{Literal} which matches "close" matches, that is, 2507 strings with at most 'n' mismatching characters. C{CloseMatch} takes parameters: 2508 - C{match_string} - string to be matched 2509 - C{maxMismatches} - (C{default=1}) maximum number of mismatches allowed to count as a match 2510 2511 The results from a successful parse will contain the matched text from the input string and the following named results: 2512 - C{mismatches} - a list of the positions within the match_string where mismatches were found 2513 - C{original} - the original match_string used to compare against the input string 2514 2515 If C{mismatches} is an empty list, then the match was an exact match. 2516 2517 Example:: 2518 patt = CloseMatch("ATCATCGAATGGA") 2519 patt.parseString("ATCATCGAAXGGA") # -> (['ATCATCGAAXGGA'], {'mismatches': [[9]], 'original': ['ATCATCGAATGGA']}) 2520 patt.parseString("ATCAXCGAAXGGA") # -> Exception: Expected 'ATCATCGAATGGA' (with up to 1 mismatches) (at char 0), (line:1, col:1) 2521 2522 # exact match 2523 patt.parseString("ATCATCGAATGGA") # -> (['ATCATCGAATGGA'], {'mismatches': [[]], 'original': ['ATCATCGAATGGA']}) 2524 2525 # close match allowing up to 2 mismatches 2526 patt = CloseMatch("ATCATCGAATGGA", maxMismatches=2) 2527 patt.parseString("ATCAXCGAAXGGA") # -> (['ATCAXCGAAXGGA'], {'mismatches': [[4, 9]], 'original': ['ATCATCGAATGGA']}) 2528 """
2529 - def __init__(self, match_string, maxMismatches=1):
2530 super(CloseMatch,self).__init__() 2531 self.name = match_string 2532 self.match_string = match_string 2533 self.maxMismatches = maxMismatches 2534 self.errmsg = "Expected %r (with up to %d mismatches)" % (self.match_string, self.maxMismatches) 2535 self.mayIndexError = False 2536 self.mayReturnEmpty = False
2537
2538 - def parseImpl( self, instring, loc, doActions=True ):
2539 start = loc 2540 instrlen = len(instring) 2541 maxloc = start + len(self.match_string) 2542 2543 if maxloc <= instrlen: 2544 match_string = self.match_string 2545 match_stringloc = 0 2546 mismatches = [] 2547 maxMismatches = self.maxMismatches 2548 2549 for match_stringloc,s_m in enumerate(zip(instring[loc:maxloc], self.match_string)): 2550 src,mat = s_m 2551 if src != mat: 2552 mismatches.append(match_stringloc) 2553 if len(mismatches) > maxMismatches: 2554 break 2555 else: 2556 loc = match_stringloc + 1 2557 results = ParseResults([instring[start:loc]]) 2558 results['original'] = self.match_string 2559 results['mismatches'] = mismatches 2560 return loc, results 2561 2562 raise ParseException(instring, loc, self.errmsg, self)
2563
2564 2565 -class Word(Token):
2566 """ 2567 Token for matching words composed of allowed character sets. 2568 Defined with string containing all allowed initial characters, 2569 an optional string containing allowed body characters (if omitted, 2570 defaults to the initial character set), and an optional minimum, 2571 maximum, and/or exact length. The default value for C{min} is 1 (a 2572 minimum value < 1 is not valid); the default values for C{max} and C{exact} 2573 are 0, meaning no maximum or exact length restriction. An optional 2574 C{excludeChars} parameter can list characters that might be found in 2575 the input C{bodyChars} string; useful to define a word of all printables 2576 except for one or two characters, for instance. 2577 2578 L{srange} is useful for defining custom character set strings for defining 2579 C{Word} expressions, using range notation from regular expression character sets. 2580 2581 A common mistake is to use C{Word} to match a specific literal string, as in 2582 C{Word("Address")}. Remember that C{Word} uses the string argument to define 2583 I{sets} of matchable characters. This expression would match "Add", "AAA", 2584 "dAred", or any other word made up of the characters 'A', 'd', 'r', 'e', and 's'. 2585 To match an exact literal string, use L{Literal} or L{Keyword}. 2586 2587 pyparsing includes helper strings for building Words: 2588 - L{alphas} 2589 - L{nums} 2590 - L{alphanums} 2591 - L{hexnums} 2592 - L{alphas8bit} (alphabetic characters in ASCII range 128-255 - accented, tilded, umlauted, etc.) 2593 - L{punc8bit} (non-alphabetic characters in ASCII range 128-255 - currency, symbols, superscripts, diacriticals, etc.) 2594 - L{printables} (any non-whitespace character) 2595 2596 Example:: 2597 # a word composed of digits 2598 integer = Word(nums) # equivalent to Word("0123456789") or Word(srange("0-9")) 2599 2600 # a word with a leading capital, and zero or more lowercase 2601 capital_word = Word(alphas.upper(), alphas.lower()) 2602 2603 # hostnames are alphanumeric, with leading alpha, and '-' 2604 hostname = Word(alphas, alphanums+'-') 2605 2606 # roman numeral (not a strict parser, accepts invalid mix of characters) 2607 roman = Word("IVXLCDM") 2608 2609 # any string of non-whitespace characters, except for ',' 2610 csv_value = Word(printables, excludeChars=",") 2611 """
2612 - def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ):
2613 super(Word,self).__init__() 2614 if excludeChars: 2615 initChars = ''.join(c for c in initChars if c not in excludeChars) 2616 if bodyChars: 2617 bodyChars = ''.join(c for c in bodyChars if c not in excludeChars) 2618 self.initCharsOrig = initChars 2619 self.initChars = set(initChars) 2620 if bodyChars : 2621 self.bodyCharsOrig = bodyChars 2622 self.bodyChars = set(bodyChars) 2623 else: 2624 self.bodyCharsOrig = initChars 2625 self.bodyChars = set(initChars) 2626 2627 self.maxSpecified = max > 0 2628 2629 if min < 1: 2630 raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted") 2631 2632 self.minLen = min 2633 2634 if max > 0: 2635 self.maxLen = max 2636 else: 2637 self.maxLen = _MAX_INT 2638 2639 if exact > 0: 2640 self.maxLen = exact 2641 self.minLen = exact 2642 2643 self.name = _ustr(self) 2644 self.errmsg = "Expected " + self.name 2645 self.mayIndexError = False 2646 self.asKeyword = asKeyword 2647 2648 if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0): 2649 if self.bodyCharsOrig == self.initCharsOrig: 2650 self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig) 2651 elif len(self.initCharsOrig) == 1: 2652 self.reString = "%s[%s]*" % \ 2653 (re.escape(self.initCharsOrig), 2654 _escapeRegexRangeChars(self.bodyCharsOrig),) 2655 else: 2656 self.reString = "[%s][%s]*" % \ 2657 (_escapeRegexRangeChars(self.initCharsOrig), 2658 _escapeRegexRangeChars(self.bodyCharsOrig),) 2659 if self.asKeyword: 2660 self.reString = r"\b"+self.reString+r"\b" 2661 try: 2662 self.re = re.compile( self.reString ) 2663 except Exception: 2664 self.re = None
2665
2666 - def parseImpl( self, instring, loc, doActions=True ):
2667 if self.re: 2668 result = self.re.match(instring,loc) 2669 if not result: 2670 raise ParseException(instring, loc, self.errmsg, self) 2671 2672 loc = result.end() 2673 return loc, result.group() 2674 2675 if not(instring[ loc ] in self.initChars): 2676 raise ParseException(instring, loc, self.errmsg, self) 2677 2678 start = loc 2679 loc += 1 2680 instrlen = len(instring) 2681 bodychars = self.bodyChars 2682 maxloc = start + self.maxLen 2683 maxloc = min( maxloc, instrlen ) 2684 while loc < maxloc and instring[loc] in bodychars: 2685 loc += 1 2686 2687 throwException = False 2688 if loc - start < self.minLen: 2689 throwException = True 2690 if self.maxSpecified and loc < instrlen and instring[loc] in bodychars: 2691 throwException = True 2692 if self.asKeyword: 2693 if (start>0 and instring[start-1] in bodychars) or (loc<instrlen and instring[loc] in bodychars): 2694 throwException = True 2695 2696 if throwException: 2697 raise ParseException(instring, loc, self.errmsg, self) 2698 2699 return loc, instring[start:loc]
2700
2701 - def __str__( self ):
2702 try: 2703 return super(Word,self).__str__() 2704 except Exception: 2705 pass 2706 2707 2708 if self.strRepr is None: 2709 2710 def charsAsStr(s): 2711 if len(s)>4: 2712 return s[:4]+"..." 2713 else: 2714 return s
2715 2716 if ( self.initCharsOrig != self.bodyCharsOrig ): 2717 self.strRepr = "W:(%s,%s)" % ( charsAsStr(self.initCharsOrig), charsAsStr(self.bodyCharsOrig) ) 2718 else: 2719 self.strRepr = "W:(%s)" % charsAsStr(self.initCharsOrig) 2720 2721 return self.strRepr
2722
2723 2724 -class Regex(Token):
2725 """ 2726 Token for matching strings that match a given regular expression. 2727 Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module. 2728 If the given regex contains named groups (defined using C{(?P<name>...)}), these will be preserved as 2729 named parse results. 2730 2731 Example:: 2732 realnum = Regex(r"[+-]?\d+\.\d*") 2733 date = Regex(r'(?P<year>\d{4})-(?P<month>\d\d?)-(?P<day>\d\d?)') 2734 # ref: http://stackoverflow.com/questions/267399/how-do-you-match-only-valid-roman-numerals-with-a-regular-expression 2735 roman = Regex(r"M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})") 2736 """ 2737 compiledREtype = type(re.compile("[A-Z]"))
2738 - def __init__( self, pattern, flags=0):
2739 """The parameters C{pattern} and C{flags} are passed to the C{re.compile()} function as-is. See the Python C{re} module for an explanation of the acceptable patterns and flags.""" 2740 super(Regex,self).__init__() 2741 2742 if isinstance(pattern, basestring): 2743 if not pattern: 2744 warnings.warn("null string passed to Regex; use Empty() instead", 2745 SyntaxWarning, stacklevel=2) 2746 2747 self.pattern = pattern 2748 self.flags = flags 2749 2750 try: 2751 self.re = re.compile(self.pattern, self.flags) 2752 self.reString = self.pattern 2753 except sre_constants.error: 2754 warnings.warn("invalid pattern (%s) passed to Regex" % pattern, 2755 SyntaxWarning, stacklevel=2) 2756 raise 2757 2758 elif isinstance(pattern, Regex.compiledREtype): 2759 self.re = pattern 2760 self.pattern = \ 2761 self.reString = str(pattern) 2762 self.flags = flags 2763 2764 else: 2765 raise ValueError("Regex may only be constructed with a string or a compiled RE object") 2766 2767 self.name = _ustr(self) 2768 self.errmsg = "Expected " + self.name 2769 self.mayIndexError = False 2770 self.mayReturnEmpty = True
2771
2772 - def parseImpl( self, instring, loc, doActions=True ):
2773 result = self.re.match(instring,loc) 2774 if not result: 2775 raise ParseException(instring, loc, self.errmsg, self) 2776 2777 loc = result.end() 2778 d = result.groupdict() 2779 ret = ParseResults(result.group()) 2780 if d: 2781 for k in d: 2782 ret[k] = d[k] 2783 return loc,ret
2784
2785 - def __str__( self ):
2786 try: 2787 return super(Regex,self).__str__() 2788 except Exception: 2789 pass 2790 2791 if self.strRepr is None: 2792 self.strRepr = "Re:(%s)" % repr(self.pattern) 2793 2794 return self.strRepr
2795
2796 2797 -class QuotedString(Token):
2798 r""" 2799 Token for matching strings that are delimited by quoting characters. 2800 2801 Defined with the following parameters: 2802 - quoteChar - string of one or more characters defining the quote delimiting string 2803 - escChar - character to escape quotes, typically backslash (default=C{None}) 2804 - escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=C{None}) 2805 - multiline - boolean indicating whether quotes can span multiple lines (default=C{False}) 2806 - unquoteResults - boolean indicating whether the matched text should be unquoted (default=C{True}) 2807 - endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=C{None} => same as quoteChar) 2808 - convertWhitespaceEscapes - convert escaped whitespace (C{'\t'}, C{'\n'}, etc.) to actual whitespace (default=C{True}) 2809 2810 Example:: 2811 qs = QuotedString('"') 2812 print(qs.searchString('lsjdf "This is the quote" sldjf')) 2813 complex_qs = QuotedString('{{', endQuoteChar='}}') 2814 print(complex_qs.searchString('lsjdf {{This is the "quote"}} sldjf')) 2815 sql_qs = QuotedString('"', escQuote='""') 2816 print(sql_qs.searchString('lsjdf "This is the quote with ""embedded"" quotes" sldjf')) 2817 prints:: 2818 [['This is the quote']] 2819 [['This is the "quote"']] 2820 [['This is the quote with "embedded" quotes']] 2821 """
2822 - def __init__( self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None, convertWhitespaceEscapes=True):
2823 super(QuotedString,self).__init__() 2824 2825 # remove white space from quote chars - wont work anyway 2826 quoteChar = quoteChar.strip() 2827 if not quoteChar: 2828 warnings.warn("quoteChar cannot be the empty string",SyntaxWarning,stacklevel=2) 2829 raise SyntaxError() 2830 2831 if endQuoteChar is None: 2832 endQuoteChar = quoteChar 2833 else: 2834 endQuoteChar = endQuoteChar.strip() 2835 if not endQuoteChar: 2836 warnings.warn("endQuoteChar cannot be the empty string",SyntaxWarning,stacklevel=2) 2837 raise SyntaxError() 2838 2839 self.quoteChar = quoteChar 2840 self.quoteCharLen = len(quoteChar) 2841 self.firstQuoteChar = quoteChar[0] 2842 self.endQuoteChar = endQuoteChar 2843 self.endQuoteCharLen = len(endQuoteChar) 2844 self.escChar = escChar 2845 self.escQuote = escQuote 2846 self.unquoteResults = unquoteResults 2847 self.convertWhitespaceEscapes = convertWhitespaceEscapes 2848 2849 if multiline: 2850 self.flags = re.MULTILINE | re.DOTALL 2851 self.pattern = r'%s(?:[^%s%s]' % \ 2852 ( re.escape(self.quoteChar), 2853 _escapeRegexRangeChars(self.endQuoteChar[0]), 2854 (escChar is not None and _escapeRegexRangeChars(escChar) or '') ) 2855 else: 2856 self.flags = 0 2857 self.pattern = r'%s(?:[^%s\n\r%s]' % \ 2858 ( re.escape(self.quoteChar), 2859 _escapeRegexRangeChars(self.endQuoteChar[0]), 2860 (escChar is not None and _escapeRegexRangeChars(escChar) or '') ) 2861 if len(self.endQuoteChar) > 1: 2862 self.pattern += ( 2863 '|(?:' + ')|(?:'.join("%s[^%s]" % (re.escape(self.endQuoteChar[:i]), 2864 _escapeRegexRangeChars(self.endQuoteChar[i])) 2865 for i in range(len(self.endQuoteChar)-1,0,-1)) + ')' 2866 ) 2867 if escQuote: 2868 self.pattern += (r'|(?:%s)' % re.escape(escQuote)) 2869 if escChar: 2870 self.pattern += (r'|(?:%s.)' % re.escape(escChar)) 2871 self.escCharReplacePattern = re.escape(self.escChar)+"(.)" 2872 self.pattern += (r')*%s' % re.escape(self.endQuoteChar)) 2873 2874 try: 2875 self.re = re.compile(self.pattern, self.flags) 2876 self.reString = self.pattern 2877 except sre_constants.error: 2878 warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern, 2879 SyntaxWarning, stacklevel=2) 2880 raise 2881 2882 self.name = _ustr(self) 2883 self.errmsg = "Expected " + self.name 2884 self.mayIndexError = False 2885 self.mayReturnEmpty = True
2886
2887 - def parseImpl( self, instring, loc, doActions=True ):
2888 result = instring[loc] == self.firstQuoteChar and self.re.match(instring,loc) or None 2889 if not result: 2890 raise ParseException(instring, loc, self.errmsg, self) 2891 2892 loc = result.end() 2893 ret = result.group() 2894 2895 if self.unquoteResults: 2896 2897 # strip off quotes 2898 ret = ret[self.quoteCharLen:-self.endQuoteCharLen] 2899 2900 if isinstance(ret,basestring): 2901 # replace escaped whitespace 2902 if '\\' in ret and self.convertWhitespaceEscapes: 2903 ws_map = { 2904 r'\t' : '\t', 2905 r'\n' : '\n', 2906 r'\f' : '\f', 2907 r'\r' : '\r', 2908 } 2909 for wslit,wschar in ws_map.items(): 2910 ret = ret.replace(wslit, wschar) 2911 2912 # replace escaped characters 2913 if self.escChar: 2914 ret = re.sub(self.escCharReplacePattern,"\g<1>",ret) 2915 2916 # replace escaped quotes 2917 if self.escQuote: 2918 ret = ret.replace(self.escQuote, self.endQuoteChar) 2919 2920 return loc, ret
2921
2922 - def __str__( self ):
2923 try: 2924 return super(QuotedString,self).__str__() 2925 except Exception: 2926 pass 2927 2928 if self.strRepr is None: 2929 self.strRepr = "quoted string, starting with %s ending with %s" % (self.quoteChar, self.endQuoteChar) 2930 2931 return self.strRepr
2932
2933 2934 -class CharsNotIn(Token):
2935 """ 2936 Token for matching words composed of characters I{not} in a given set (will 2937 include whitespace in matched characters if not listed in the provided exclusion set - see example). 2938 Defined with string containing all disallowed characters, and an optional 2939 minimum, maximum, and/or exact length. The default value for C{min} is 1 (a 2940 minimum value < 1 is not valid); the default values for C{max} and C{exact} 2941 are 0, meaning no maximum or exact length restriction. 2942 2943 Example:: 2944 # define a comma-separated-value as anything that is not a ',' 2945 csv_value = CharsNotIn(',') 2946 print(delimitedList(csv_value).parseString("dkls,lsdkjf,s12 34,@!#,213")) 2947 prints:: 2948 ['dkls', 'lsdkjf', 's12 34', '@!#', '213'] 2949 """
2950 - def __init__( self, notChars, min=1, max=0, exact=0 ):
2951 super(CharsNotIn,self).__init__() 2952 self.skipWhitespace = False 2953 self.notChars = notChars 2954 2955 if min < 1: 2956 raise ValueError("cannot specify a minimum length < 1; use Optional(CharsNotIn()) if zero-length char group is permitted") 2957 2958 self.minLen = min 2959 2960 if max > 0: 2961 self.maxLen = max 2962 else: 2963 self.maxLen = _MAX_INT 2964 2965 if exact > 0: 2966 self.maxLen = exact 2967 self.minLen = exact 2968 2969 self.name = _ustr(self) 2970 self.errmsg = "Expected " + self.name 2971 self.mayReturnEmpty = ( self.minLen == 0 ) 2972 self.mayIndexError = False
2973
2974 - def parseImpl( self, instring, loc, doActions=True ):
2975 if instring[loc] in self.notChars: 2976 raise ParseException(instring, loc, self.errmsg, self) 2977 2978 start = loc 2979 loc += 1 2980 notchars = self.notChars 2981 maxlen = min( start+self.maxLen, len(instring) ) 2982 while loc < maxlen and \ 2983 (instring[loc] not in notchars): 2984 loc += 1 2985 2986 if loc - start < self.minLen: 2987 raise ParseException(instring, loc, self.errmsg, self) 2988 2989 return loc, instring[start:loc]
2990
2991 - def __str__( self ):
2992 try: 2993 return super(CharsNotIn, self).__str__() 2994 except Exception: 2995 pass 2996 2997 if self.strRepr is None: 2998 if len(self.notChars) > 4: 2999 self.strRepr = "!W:(%s...)" % self.notChars[:4] 3000 else: 3001 self.strRepr = "!W:(%s)" % self.notChars 3002 3003 return self.strRepr
3004
3005 -class White(Token):
3006 """ 3007 Special matching class for matching whitespace. Normally, whitespace is ignored 3008 by pyparsing grammars. This class is included when some whitespace structures 3009 are significant. Define with a string containing the whitespace characters to be 3010 matched; default is C{" \\t\\r\\n"}. Also takes optional C{min}, C{max}, and C{exact} arguments, 3011 as defined for the C{L{Word}} class. 3012 """ 3013 whiteStrs = { 3014 " " : "<SPC>", 3015 "\t": "<TAB>", 3016 "\n": "<LF>", 3017 "\r": "<CR>", 3018 "\f": "<FF>", 3019 }
3020 - def __init__(self, ws=" \t\r\n", min=1, max=0, exact=0):
3021 super(White,self).__init__() 3022 self.matchWhite = ws 3023 self.setWhitespaceChars( "".join(c for c in self.whiteChars if c not in self.matchWhite) ) 3024 #~ self.leaveWhitespace() 3025 self.name = ("".join(White.whiteStrs[c] for c in self.matchWhite)) 3026 self.mayReturnEmpty = True 3027 self.errmsg = "Expected " + self.name 3028 3029 self.minLen = min 3030 3031 if max > 0: 3032 self.maxLen = max 3033 else: 3034 self.maxLen = _MAX_INT 3035 3036 if exact > 0: 3037 self.maxLen = exact 3038 self.minLen = exact
3039
3040 - def parseImpl( self, instring, loc, doActions=True ):
3041 if not(instring[ loc ] in self.matchWhite): 3042 raise ParseException(instring, loc, self.errmsg, self) 3043 start = loc 3044 loc += 1 3045 maxloc = start + self.maxLen 3046 maxloc = min( maxloc, len(instring) ) 3047 while loc < maxloc and instring[loc] in self.matchWhite: 3048 loc += 1 3049 3050 if loc - start < self.minLen: 3051 raise ParseException(instring, loc, self.errmsg, self) 3052 3053 return loc, instring[start:loc]
3054
3055 3056 -class _PositionToken(Token):
3057 - def __init__( self ):
3058 super(_PositionToken,self).__init__() 3059 self.name=self.__class__.__name__ 3060 self.mayReturnEmpty = True 3061 self.mayIndexError = False
3062
3063 -class GoToColumn(_PositionToken):
3064 """ 3065 Token to advance to a specific column of input text; useful for tabular report scraping. 3066 """
3067 - def __init__( self, colno ):
3068 super(GoToColumn,self).__init__() 3069 self.col = colno
3070
3071 - def preParse( self, instring, loc ):
3072 if col(loc,instring) != self.col: 3073 instrlen = len(instring) 3074 if self.ignoreExprs: 3075 loc = self._skipIgnorables( instring, loc ) 3076 while loc < instrlen and instring[loc].isspace() and col( loc, instring ) != self.col : 3077 loc += 1 3078 return loc
3079
3080 - def parseImpl( self, instring, loc, doActions=True ):
3081 thiscol = col( loc, instring ) 3082 if thiscol > self.col: 3083 raise ParseException( instring, loc, "Text not in expected column", self ) 3084 newloc = loc + self.col - thiscol 3085 ret = instring[ loc: newloc ] 3086 return newloc, ret
3087
3088 3089 -class LineStart(_PositionToken):
3090 """ 3091 Matches if current position is at the beginning of a line within the parse string 3092 3093 Example:: 3094 3095 test = '''\ 3096 AAA this line 3097 AAA and this line 3098 AAA but not this one 3099 B AAA and definitely not this one 3100 ''' 3101 3102 for t in (LineStart() + 'AAA' + restOfLine).searchString(test): 3103 print(t) 3104 3105 Prints:: 3106 ['AAA', ' this line'] 3107 ['AAA', ' and this line'] 3108 3109 """
3110 - def __init__( self ):
3111 super(LineStart,self).__init__() 3112 self.errmsg = "Expected start of line"
3113
3114 - def parseImpl( self, instring, loc, doActions=True ):
3115 if col(loc, instring) == 1: 3116 return loc, [] 3117 raise ParseException(instring, loc, self.errmsg, self)
3118
3119 -class LineEnd(_PositionToken):
3120 """ 3121 Matches if current position is at the end of a line within the parse string 3122 """
3123 - def __init__( self ):
3124 super(LineEnd,self).__init__() 3125 self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") ) 3126 self.errmsg = "Expected end of line"
3127
3128 - def parseImpl( self, instring, loc, doActions=True ):
3129 if loc<len(instring): 3130 if instring[loc] == "\n": 3131 return loc+1, "\n" 3132 else: 3133 raise ParseException(instring, loc, self.errmsg, self) 3134 elif loc == len(instring): 3135 return loc+1, [] 3136 else: 3137 raise ParseException(instring, loc, self.errmsg, self)
3138
3139 -class StringStart(_PositionToken):
3140 """ 3141 Matches if current position is at the beginning of the parse string 3142 """
3143 - def __init__( self ):
3144 super(StringStart,self).__init__() 3145 self.errmsg = "Expected start of text"
3146
3147 - def parseImpl( self, instring, loc, doActions=True ):
3148 if loc != 0: 3149 # see if entire string up to here is just whitespace and ignoreables 3150 if loc != self.preParse( instring, 0 ): 3151 raise ParseException(instring, loc, self.errmsg, self) 3152 return loc, []
3153
3154 -class StringEnd(_PositionToken):
3155 """ 3156 Matches if current position is at the end of the parse string 3157 """
3158 - def __init__( self ):
3159 super(StringEnd,self).__init__() 3160 self.errmsg = "Expected end of text"
3161
3162 - def parseImpl( self, instring, loc, doActions=True ):
3163 if loc < len(instring): 3164 raise ParseException(instring, loc, self.errmsg, self) 3165 elif loc == len(instring): 3166 return loc+1, [] 3167 elif loc > len(instring): 3168 return loc, [] 3169 else: 3170 raise ParseException(instring, loc, self.errmsg, self)
3171
3172 -class WordStart(_PositionToken):
3173 """ 3174 Matches if the current position is at the beginning of a Word, and 3175 is not preceded by any character in a given set of C{wordChars} 3176 (default=C{printables}). To emulate the C{\b} behavior of regular expressions, 3177 use C{WordStart(alphanums)}. C{WordStart} will also match at the beginning of 3178 the string being parsed, or at the beginning of a line. 3179 """
3180 - def __init__(self, wordChars = printables):
3181 super(WordStart,self).__init__() 3182 self.wordChars = set(wordChars) 3183 self.errmsg = "Not at the start of a word"
3184
3185 - def parseImpl(self, instring, loc, doActions=True ):
3186 if loc != 0: 3187 if (instring[loc-1] in self.wordChars or 3188 instring[loc] not in self.wordChars): 3189 raise ParseException(instring, loc, self.errmsg, self) 3190 return loc, []
3191
3192 -class WordEnd(_PositionToken):
3193 """ 3194 Matches if the current position is at the end of a Word, and 3195 is not followed by any character in a given set of C{wordChars} 3196 (default=C{printables}). To emulate the C{\b} behavior of regular expressions, 3197 use C{WordEnd(alphanums)}. C{WordEnd} will also match at the end of 3198 the string being parsed, or at the end of a line. 3199 """
3200 - def __init__(self, wordChars = printables):
3201 super(WordEnd,self).__init__() 3202 self.wordChars = set(wordChars) 3203 self.skipWhitespace = False 3204 self.errmsg = "Not at the end of a word"
3205
3206 - def parseImpl(self, instring, loc, doActions=True ):
3207 instrlen = len(instring) 3208 if instrlen>0 and loc<instrlen: 3209 if (instring[loc] in self.wordChars or 3210 instring[loc-1] not in self.wordChars): 3211 raise ParseException(instring, loc, self.errmsg, self) 3212 return loc, []
3213
3214 3215 -class ParseExpression(ParserElement):
3216 """ 3217 Abstract subclass of ParserElement, for combining and post-processing parsed tokens. 3218 """
3219 - def __init__( self, exprs, savelist = False ):
3220 super(ParseExpression,self).__init__(savelist) 3221 if isinstance( exprs, _generatorType ): 3222 exprs = list(exprs) 3223 3224 if isinstance( exprs, basestring ): 3225 self.exprs = [ ParserElement._literalStringClass( exprs ) ] 3226 elif isinstance( exprs, collections.Iterable ): 3227 exprs = list(exprs) 3228 # if sequence of strings provided, wrap with Literal 3229 if all(isinstance(expr, basestring) for expr in exprs): 3230 exprs = map(ParserElement._literalStringClass, exprs) 3231 self.exprs = list(exprs) 3232 else: 3233 try: 3234 self.exprs = list( exprs ) 3235 except TypeError: 3236 self.exprs = [ exprs ] 3237 self.callPreparse = False
3238
3239 - def __getitem__( self, i ):
3240 return self.exprs[i]
3241
3242 - def append( self, other ):
3243 self.exprs.append( other ) 3244 self.strRepr = None 3245 return self
3246
3247 - def leaveWhitespace( self ):
3248 """Extends C{leaveWhitespace} defined in base class, and also invokes C{leaveWhitespace} on 3249 all contained expressions.""" 3250 self.skipWhitespace = False 3251 self.exprs = [ e.copy() for e in self.exprs ] 3252 for e in self.exprs: 3253 e.leaveWhitespace() 3254 return self
3255
3256 - def ignore( self, other ):
3257 if isinstance( other, Suppress ): 3258 if other not in self.ignoreExprs: 3259 super( ParseExpression, self).ignore( other ) 3260 for e in self.exprs: 3261 e.ignore( self.ignoreExprs[-1] ) 3262 else: 3263 super( ParseExpression, self).ignore( other ) 3264 for e in self.exprs: 3265 e.ignore( self.ignoreExprs[-1] ) 3266 return self
3267
3268 - def __str__( self ):
3269 try: 3270 return super(ParseExpression,self).__str__() 3271 except Exception: 3272 pass 3273 3274 if self.strRepr is None: 3275 self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.exprs) ) 3276 return self.strRepr
3277
3278 - def streamline( self ):
3279 super(ParseExpression,self).streamline() 3280 3281 for e in self.exprs: 3282 e.streamline() 3283 3284 # collapse nested And's of the form And( And( And( a,b), c), d) to And( a,b,c,d ) 3285 # but only if there are no parse actions or resultsNames on the nested And's 3286 # (likewise for Or's and MatchFirst's) 3287 if ( len(self.exprs) == 2 ): 3288 other = self.exprs[0] 3289 if ( isinstance( other, self.__class__ ) and 3290 not(other.parseAction) and 3291 other.resultsName is None and 3292 not other.debug ): 3293 self.exprs = other.exprs[:] + [ self.exprs[1] ] 3294 self.strRepr = None 3295 self.mayReturnEmpty |= other.mayReturnEmpty 3296 self.mayIndexError |= other.mayIndexError 3297 3298 other = self.exprs[-1] 3299 if ( isinstance( other, self.__class__ ) and 3300 not(other.parseAction) and 3301 other.resultsName is None and 3302 not other.debug ): 3303 self.exprs = self.exprs[:-1] + other.exprs[:] 3304 self.strRepr = None 3305 self.mayReturnEmpty |= other.mayReturnEmpty 3306 self.mayIndexError |= other.mayIndexError 3307 3308 self.errmsg = "Expected " + _ustr(self) 3309 3310 return self
3311
3312 - def setResultsName( self, name, listAllMatches=False ):
3313 ret = super(ParseExpression,self).setResultsName(name,listAllMatches) 3314 return ret
3315
3316 - def validate( self, validateTrace=[] ):
3317 tmp = validateTrace[:]+[self] 3318 for e in self.exprs: 3319 e.validate(tmp) 3320 self.checkRecursion( [] )
3321
3322 - def copy(self):
3323 ret = super(ParseExpression,self).copy() 3324 ret.exprs = [e.copy() for e in self.exprs] 3325 return ret
3326
3327 -class And(ParseExpression):
3328 """ 3329 Requires all given C{ParseExpression}s to be found in the given order. 3330 Expressions may be separated by whitespace. 3331 May be constructed using the C{'+'} operator. 3332 May also be constructed using the C{'-'} operator, which will suppress backtracking. 3333 3334 Example:: 3335 integer = Word(nums) 3336 name_expr = OneOrMore(Word(alphas)) 3337 3338 expr = And([integer("id"),name_expr("name"),integer("age")]) 3339 # more easily written as: 3340 expr = integer("id") + name_expr("name") + integer("age") 3341 """ 3342
3343 - class _ErrorStop(Empty):
3344 - def __init__(self, *args, **kwargs):
3345 super(And._ErrorStop,self).__init__(*args, **kwargs) 3346 self.name = '-' 3347 self.leaveWhitespace()
3348
3349 - def __init__( self, exprs, savelist = True ):
3350 super(And,self).__init__(exprs, savelist) 3351 self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) 3352 self.setWhitespaceChars( self.exprs[0].whiteChars ) 3353 self.skipWhitespace = self.exprs[0].skipWhitespace 3354 self.callPreparse = True
3355
3356 - def parseImpl( self, instring, loc, doActions=True ):
3357 # pass False as last arg to _parse for first element, since we already 3358 # pre-parsed the string as part of our And pre-parsing 3359 loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False ) 3360 errorStop = False 3361 for e in self.exprs[1:]: 3362 if isinstance(e, And._ErrorStop): 3363 errorStop = True 3364 continue 3365 if errorStop: 3366 try: 3367 loc, exprtokens = e._parse( instring, loc, doActions ) 3368 except ParseSyntaxException: 3369 raise 3370 except ParseBaseException as pe: 3371 pe.__traceback__ = None 3372 raise ParseSyntaxException._from_exception(pe) 3373 except IndexError: 3374 raise ParseSyntaxException(instring, len(instring), self.errmsg, self) 3375 else: 3376 loc, exprtokens = e._parse( instring, loc, doActions ) 3377 if exprtokens or exprtokens.haskeys(): 3378 resultlist += exprtokens 3379 return loc, resultlist
3380
3381 - def __iadd__(self, other ):
3382 if isinstance( other, basestring ): 3383 other = ParserElement._literalStringClass( other ) 3384 return self.append( other ) #And( [ self, other ] )
3385
3386 - def checkRecursion( self, parseElementList ):
3387 subRecCheckList = parseElementList[:] + [ self ] 3388 for e in self.exprs: 3389 e.checkRecursion( subRecCheckList ) 3390 if not e.mayReturnEmpty: 3391 break
3392
3393 - def __str__( self ):
3394 if hasattr(self,"name"): 3395 return self.name 3396 3397 if self.strRepr is None: 3398 self.strRepr = "{" + " ".join(_ustr(e) for e in self.exprs) + "}" 3399 3400 return self.strRepr
3401
3402 3403 -class Or(ParseExpression):
3404 """ 3405 Requires that at least one C{ParseExpression} is found. 3406 If two expressions match, the expression that matches the longest string will be used. 3407 May be constructed using the C{'^'} operator. 3408 3409 Example:: 3410 # construct Or using '^' operator 3411 3412 number = Word(nums) ^ Combine(Word(nums) + '.' + Word(nums)) 3413 print(number.searchString("123 3.1416 789")) 3414 prints:: 3415 [['123'], ['3.1416'], ['789']] 3416 """
3417 - def __init__( self, exprs, savelist = False ):
3418 super(Or,self).__init__(exprs, savelist) 3419 if self.exprs: 3420 self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) 3421 else: 3422 self.mayReturnEmpty = True
3423
3424 - def parseImpl( self, instring, loc, doActions=True ):
3425 maxExcLoc = -1 3426 maxException = None 3427 matches = [] 3428 for e in self.exprs: 3429 try: 3430 loc2 = e.tryParse( instring, loc ) 3431 except ParseException as err: 3432 err.__traceback__ = None 3433 if err.loc > maxExcLoc: 3434 maxException = err 3435 maxExcLoc = err.loc 3436 except IndexError: 3437 if len(instring) > maxExcLoc: 3438 maxException = ParseException(instring,len(instring),e.errmsg,self) 3439 maxExcLoc = len(instring) 3440 else: 3441 # save match among all matches, to retry longest to shortest 3442 matches.append((loc2, e)) 3443 3444 if matches: 3445 matches.sort(key=lambda x: -x[0]) 3446 for _,e in matches: 3447 try: 3448 return e._parse( instring, loc, doActions ) 3449 except ParseException as err: 3450 err.__traceback__ = None 3451 if err.loc > maxExcLoc: 3452 maxException = err 3453 maxExcLoc = err.loc 3454 3455 if maxException is not None: 3456 maxException.msg = self.errmsg 3457 raise maxException 3458 else: 3459 raise ParseException(instring, loc, "no defined alternatives to match", self)
3460 3461
3462 - def __ixor__(self, other ):
3463 if isinstance( other, basestring ): 3464 other = ParserElement._literalStringClass( other ) 3465 return self.append( other ) #Or( [ self, other ] )
3466
3467 - def __str__( self ):
3468 if hasattr(self,"name"): 3469 return self.name 3470 3471 if self.strRepr is None: 3472 self.strRepr = "{" + " ^ ".join(_ustr(e) for e in self.exprs) + "}" 3473 3474 return self.strRepr
3475
3476 - def checkRecursion( self, parseElementList ):
3477 subRecCheckList = parseElementList[:] + [ self ] 3478 for e in self.exprs: 3479 e.checkRecursion( subRecCheckList )
3480
3481 3482 -class MatchFirst(ParseExpression):
3483 """ 3484 Requires that at least one C{ParseExpression} is found. 3485 If two expressions match, the first one listed is the one that will match. 3486 May be constructed using the C{'|'} operator. 3487 3488 Example:: 3489 # construct MatchFirst using '|' operator 3490 3491 # watch the order of expressions to match 3492 number = Word(nums) | Combine(Word(nums) + '.' + Word(nums)) 3493 print(number.searchString("123 3.1416 789")) # Fail! -> [['123'], ['3'], ['1416'], ['789']] 3494 3495 # put more selective expression first 3496 number = Combine(Word(nums) + '.' + Word(nums)) | Word(nums) 3497 print(number.searchString("123 3.1416 789")) # Better -> [['123'], ['3.1416'], ['789']] 3498 """
3499 - def __init__( self, exprs, savelist = False ):
3500 super(MatchFirst,self).__init__(exprs, savelist) 3501 if self.exprs: 3502 self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) 3503 else: 3504 self.mayReturnEmpty = True
3505
3506 - def parseImpl( self, instring, loc, doActions=True ):
3507 maxExcLoc = -1 3508 maxException = None 3509 for e in self.exprs: 3510 try: 3511 ret = e._parse( instring, loc, doActions ) 3512 return ret 3513 except ParseException as err: 3514 if err.loc > maxExcLoc: 3515 maxException = err 3516 maxExcLoc = err.loc 3517 except IndexError: 3518 if len(instring) > maxExcLoc: 3519 maxException = ParseException(instring,len(instring),e.errmsg,self) 3520 maxExcLoc = len(instring) 3521 3522 # only got here if no expression matched, raise exception for match that made it the furthest 3523 else: 3524 if maxException is not None: 3525 maxException.msg = self.errmsg 3526 raise maxException 3527 else: 3528 raise ParseException(instring, loc, "no defined alternatives to match", self)
3529
3530 - def __ior__(self, other ):
3531 if isinstance( other, basestring ): 3532 other = ParserElement._literalStringClass( other ) 3533 return self.append( other ) #MatchFirst( [ self, other ] )
3534
3535 - def __str__( self ):
3536 if hasattr(self,"name"): 3537 return self.name 3538 3539 if self.strRepr is None: 3540 self.strRepr = "{" + " | ".join(_ustr(e) for e in self.exprs) + "}" 3541 3542 return self.strRepr
3543
3544 - def checkRecursion( self, parseElementList ):
3545 subRecCheckList = parseElementList[:] + [ self ] 3546 for e in self.exprs: 3547 e.checkRecursion( subRecCheckList )
3548
3549 3550 -class Each(ParseExpression):
3551 """ 3552 Requires all given C{ParseExpression}s to be found, but in any order. 3553 Expressions may be separated by whitespace. 3554 May be constructed using the C{'&'} operator. 3555 3556 Example:: 3557 color = oneOf("RED ORANGE YELLOW GREEN BLUE PURPLE BLACK WHITE BROWN") 3558 shape_type = oneOf("SQUARE CIRCLE TRIANGLE STAR HEXAGON OCTAGON") 3559 integer = Word(nums) 3560 shape_attr = "shape:" + shape_type("shape") 3561 posn_attr = "posn:" + Group(integer("x") + ',' + integer("y"))("posn") 3562 color_attr = "color:" + color("color") 3563 size_attr = "size:" + integer("size") 3564 3565 # use Each (using operator '&') to accept attributes in any order 3566 # (shape and posn are required, color and size are optional) 3567 shape_spec = shape_attr & posn_attr & Optional(color_attr) & Optional(size_attr) 3568 3569 shape_spec.runTests(''' 3570 shape: SQUARE color: BLACK posn: 100, 120 3571 shape: CIRCLE size: 50 color: BLUE posn: 50,80 3572 color:GREEN size:20 shape:TRIANGLE posn:20,40 3573 ''' 3574 ) 3575 prints:: 3576 shape: SQUARE color: BLACK posn: 100, 120 3577 ['shape:', 'SQUARE', 'color:', 'BLACK', 'posn:', ['100', ',', '120']] 3578 - color: BLACK 3579 - posn: ['100', ',', '120'] 3580 - x: 100 3581 - y: 120 3582 - shape: SQUARE 3583 3584 3585 shape: CIRCLE size: 50 color: BLUE posn: 50,80 3586 ['shape:', 'CIRCLE', 'size:', '50', 'color:', 'BLUE', 'posn:', ['50', ',', '80']] 3587 - color: BLUE 3588 - posn: ['50', ',', '80'] 3589 - x: 50 3590 - y: 80 3591 - shape: CIRCLE 3592 - size: 50 3593 3594 3595 color: GREEN size: 20 shape: TRIANGLE posn: 20,40 3596 ['color:', 'GREEN', 'size:', '20', 'shape:', 'TRIANGLE', 'posn:', ['20', ',', '40']] 3597 - color: GREEN 3598 - posn: ['20', ',', '40'] 3599 - x: 20 3600 - y: 40 3601 - shape: TRIANGLE 3602 - size: 20 3603 """
3604 - def __init__( self, exprs, savelist = True ):
3605 super(Each,self).__init__(exprs, savelist) 3606 self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) 3607 self.skipWhitespace = True 3608 self.initExprGroups = True
3609
3610 - def parseImpl( self, instring, loc, doActions=True ):
3611 if self.initExprGroups: 3612 self.opt1map = dict((id(e.expr),e) for e in self.exprs if isinstance(e,Optional)) 3613 opt1 = [ e.expr for e in self.exprs if isinstance(e,Optional) ] 3614 opt2 = [ e for e in self.exprs if e.mayReturnEmpty and not isinstance(e,Optional)] 3615 self.optionals = opt1 + opt2 3616 self.multioptionals = [ e.expr for e in self.exprs if isinstance(e,ZeroOrMore) ] 3617 self.multirequired = [ e.expr for e in self.exprs if isinstance(e,OneOrMore) ] 3618 self.required = [ e for e in self.exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ] 3619 self.required += self.multirequired 3620 self.initExprGroups = False 3621 tmpLoc = loc 3622 tmpReqd = self.required[:] 3623 tmpOpt = self.optionals[:] 3624 matchOrder = [] 3625 3626 keepMatching = True 3627 while keepMatching: 3628 tmpExprs = tmpReqd + tmpOpt + self.multioptionals + self.multirequired 3629 failed = [] 3630 for e in tmpExprs: 3631 try: 3632 tmpLoc = e.tryParse( instring, tmpLoc ) 3633 except ParseException: 3634 failed.append(e) 3635 else: 3636 matchOrder.append(self.opt1map.get(id(e),e)) 3637 if e in tmpReqd: 3638 tmpReqd.remove(e) 3639 elif e in tmpOpt: 3640 tmpOpt.remove(e) 3641 if len(failed) == len(tmpExprs): 3642 keepMatching = False 3643 3644 if tmpReqd: 3645 missing = ", ".join(_ustr(e) for e in tmpReqd) 3646 raise ParseException(instring,loc,"Missing one or more required elements (%s)" % missing ) 3647 3648 # add any unmatched Optionals, in case they have default values defined 3649 matchOrder += [e for e in self.exprs if isinstance(e,Optional) and e.expr in tmpOpt] 3650 3651 resultlist = [] 3652 for e in matchOrder: 3653 loc,results = e._parse(instring,loc,doActions) 3654 resultlist.append(results) 3655 3656 finalResults = sum(resultlist, ParseResults([])) 3657 return loc, finalResults
3658
3659 - def __str__( self ):
3660 if hasattr(self,"name"): 3661 return self.name 3662 3663 if self.strRepr is None: 3664 self.strRepr = "{" + " & ".join(_ustr(e) for e in self.exprs) + "}" 3665 3666 return self.strRepr
3667
3668 - def checkRecursion( self, parseElementList ):
3669 subRecCheckList = parseElementList[:] + [ self ] 3670 for e in self.exprs: 3671 e.checkRecursion( subRecCheckList )
3672
3673 3674 -class ParseElementEnhance(ParserElement):
3675 """ 3676 Abstract subclass of C{ParserElement}, for combining and post-processing parsed tokens. 3677 """
3678 - def __init__( self, expr, savelist=False ):
3679 super(ParseElementEnhance,self).__init__(savelist) 3680 if isinstance( expr, basestring ): 3681 if issubclass(ParserElement._literalStringClass, Token): 3682 expr = ParserElement._literalStringClass(expr) 3683 else: 3684 expr = ParserElement._literalStringClass(Literal(expr)) 3685 self.expr = expr 3686 self.strRepr = None 3687 if expr is not None: 3688 self.mayIndexError = expr.mayIndexError 3689 self.mayReturnEmpty = expr.mayReturnEmpty 3690 self.setWhitespaceChars( expr.whiteChars ) 3691 self.skipWhitespace = expr.skipWhitespace 3692 self.saveAsList = expr.saveAsList 3693 self.callPreparse = expr.callPreparse 3694 self.ignoreExprs.extend(expr.ignoreExprs)
3695
3696 - def parseImpl( self, instring, loc, doActions=True ):
3697 if self.expr is not None: 3698 return self.expr._parse( instring, loc, doActions, callPreParse=False ) 3699 else: 3700 raise ParseException("",loc,self.errmsg,self)
3701
3702 - def leaveWhitespace( self ):
3703 self.skipWhitespace = False 3704 self.expr = self.expr.copy() 3705 if self.expr is not None: 3706 self.expr.leaveWhitespace() 3707 return self
3708
3709 - def ignore( self, other ):
3710 if isinstance( other, Suppress ): 3711 if other not in self.ignoreExprs: 3712 super( ParseElementEnhance, self).ignore( other ) 3713 if self.expr is not None: 3714 self.expr.ignore( self.ignoreExprs[-1] ) 3715 else: 3716 super( ParseElementEnhance, self).ignore( other ) 3717 if self.expr is not None: 3718 self.expr.ignore( self.ignoreExprs[-1] ) 3719 return self
3720
3721 - def streamline( self ):
3722 super(ParseElementEnhance,self).streamline() 3723 if self.expr is not None: 3724 self.expr.streamline() 3725 return self
3726
3727 - def checkRecursion( self, parseElementList ):
3728 if self in parseElementList: 3729 raise RecursiveGrammarException( parseElementList+[self] ) 3730 subRecCheckList = parseElementList[:] + [ self ] 3731 if self.expr is not None: 3732 self.expr.checkRecursion( subRecCheckList )
3733
3734 - def validate( self, validateTrace=[] ):
3735 tmp = validateTrace[:]+[self] 3736 if self.expr is not None: 3737 self.expr.validate(tmp) 3738 self.checkRecursion( [] )
3739
3740 - def __str__( self ):
3741 try: 3742 return super(ParseElementEnhance,self).__str__() 3743 except Exception: 3744 pass 3745 3746 if self.strRepr is None and self.expr is not None: 3747 self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.expr) ) 3748 return self.strRepr
3749
3750 3751 -class FollowedBy(ParseElementEnhance):
3752 """ 3753 Lookahead matching of the given parse expression. C{FollowedBy} 3754 does I{not} advance the parsing position within the input string, it only 3755 verifies that the specified parse expression matches at the current 3756 position. C{FollowedBy} always returns a null token list. 3757 3758 Example:: 3759 # use FollowedBy to match a label only if it is followed by a ':' 3760 data_word = Word(alphas) 3761 label = data_word + FollowedBy(':') 3762 attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) 3763 3764 OneOrMore(attr_expr).parseString("shape: SQUARE color: BLACK posn: upper left").pprint() 3765 prints:: 3766 [['shape', 'SQUARE'], ['color', 'BLACK'], ['posn', 'upper left']] 3767 """
3768 - def __init__( self, expr ):
3769 super(FollowedBy,self).__init__(expr) 3770 self.mayReturnEmpty = True
3771
3772 - def parseImpl( self, instring, loc, doActions=True ):
3773 self.expr.tryParse( instring, loc ) 3774 return loc, []
3775
3776 3777 -class NotAny(ParseElementEnhance):
3778 """ 3779 Lookahead to disallow matching with the given parse expression. C{NotAny} 3780 does I{not} advance the parsing position within the input string, it only 3781 verifies that the specified parse expression does I{not} match at the current 3782 position. Also, C{NotAny} does I{not} skip over leading whitespace. C{NotAny} 3783 always returns a null token list. May be constructed using the '~' operator. 3784 3785 Example:: 3786 3787 """
3788 - def __init__( self, expr ):
3789 super(NotAny,self).__init__(expr) 3790 #~ self.leaveWhitespace() 3791 self.skipWhitespace = False # do NOT use self.leaveWhitespace(), don't want to propagate to exprs 3792 self.mayReturnEmpty = True 3793 self.errmsg = "Found unwanted token, "+_ustr(self.expr)
3794
3795 - def parseImpl( self, instring, loc, doActions=True ):
3796 if self.expr.canParseNext(instring, loc): 3797 raise ParseException(instring, loc, self.errmsg, self) 3798 return loc, []
3799
3800 - def __str__( self ):
3801 if hasattr(self,"name"): 3802 return self.name 3803 3804 if self.strRepr is None: 3805 self.strRepr = "~{" + _ustr(self.expr) + "}" 3806 3807 return self.strRepr
3808
3809 -class _MultipleMatch(ParseElementEnhance):
3810 - def __init__( self, expr, stopOn=None):
3811 super(_MultipleMatch, self).__init__(expr) 3812 self.saveAsList = True 3813 ender = stopOn 3814 if isinstance(ender, basestring): 3815 ender = ParserElement._literalStringClass(ender) 3816 self.not_ender = ~ender if ender is not None else None
3817
3818 - def parseImpl( self, instring, loc, doActions=True ):
3819 self_expr_parse = self.expr._parse 3820 self_skip_ignorables = self._skipIgnorables 3821 check_ender = self.not_ender is not None 3822 if check_ender: 3823 try_not_ender = self.not_ender.tryParse 3824 3825 # must be at least one (but first see if we are the stopOn sentinel; 3826 # if so, fail) 3827 if check_ender: 3828 try_not_ender(instring, loc) 3829 loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False ) 3830 try: 3831 hasIgnoreExprs = (not not self.ignoreExprs) 3832 while 1: 3833 if check_ender: 3834 try_not_ender(instring, loc) 3835 if hasIgnoreExprs: 3836 preloc = self_skip_ignorables( instring, loc ) 3837 else: 3838 preloc = loc 3839 loc, tmptokens = self_expr_parse( instring, preloc, doActions ) 3840 if tmptokens or tmptokens.haskeys(): 3841 tokens += tmptokens 3842 except (ParseException,IndexError): 3843 pass 3844 3845 return loc, tokens
3846
3847 -class OneOrMore(_MultipleMatch):
3848 """ 3849 Repetition of one or more of the given expression. 3850 3851 Parameters: 3852 - expr - expression that must match one or more times 3853 - stopOn - (default=C{None}) - expression for a terminating sentinel 3854 (only required if the sentinel would ordinarily match the repetition 3855 expression) 3856 3857 Example:: 3858 data_word = Word(alphas) 3859 label = data_word + FollowedBy(':') 3860 attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join)) 3861 3862 text = "shape: SQUARE posn: upper left color: BLACK" 3863 OneOrMore(attr_expr).parseString(text).pprint() # Fail! read 'color' as data instead of next label -> [['shape', 'SQUARE color']] 3864 3865 # use stopOn attribute for OneOrMore to avoid reading label string as part of the data 3866 attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) 3867 OneOrMore(attr_expr).parseString(text).pprint() # Better -> [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'BLACK']] 3868 3869 # could also be written as 3870 (attr_expr * (1,)).parseString(text).pprint() 3871 """ 3872
3873 - def __str__( self ):
3874 if hasattr(self,"name"): 3875 return self.name 3876 3877 if self.strRepr is None: 3878 self.strRepr = "{" + _ustr(self.expr) + "}..." 3879 3880 return self.strRepr
3881
3882 -class ZeroOrMore(_MultipleMatch):
3883 """ 3884 Optional repetition of zero or more of the given expression. 3885 3886 Parameters: 3887 - expr - expression that must match zero or more times 3888 - stopOn - (default=C{None}) - expression for a terminating sentinel 3889 (only required if the sentinel would ordinarily match the repetition 3890 expression) 3891 3892 Example: similar to L{OneOrMore} 3893 """
3894 - def __init__( self, expr, stopOn=None):
3895 super(ZeroOrMore,self).__init__(expr, stopOn=stopOn) 3896 self.mayReturnEmpty = True
3897
3898 - def parseImpl( self, instring, loc, doActions=True ):
3899 try: 3900 return super(ZeroOrMore, self).parseImpl(instring, loc, doActions) 3901 except (ParseException,IndexError): 3902 return loc, []
3903
3904 - def __str__( self ):
3905 if hasattr(self,"name"): 3906 return self.name 3907 3908 if self.strRepr is None: 3909 self.strRepr = "[" + _ustr(self.expr) + "]..." 3910 3911 return self.strRepr
3912
3913 -class _NullToken(object):
3914 - def __bool__(self):
3915 return False
3916 __nonzero__ = __bool__
3917 - def __str__(self):
3918 return ""
3919 3920 _optionalNotMatched = _NullToken()
3921 -class Optional(ParseElementEnhance):
3922 """ 3923 Optional matching of the given expression. 3924 3925 Parameters: 3926 - expr - expression that must match zero or more times 3927 - default (optional) - value to be returned if the optional expression is not found. 3928 3929 Example:: 3930 # US postal code can be a 5-digit zip, plus optional 4-digit qualifier 3931 zip = Combine(Word(nums, exact=5) + Optional('-' + Word(nums, exact=4))) 3932 zip.runTests(''' 3933 # traditional ZIP code 3934 12345 3935 3936 # ZIP+4 form 3937 12101-0001 3938 3939 # invalid ZIP 3940 98765- 3941 ''') 3942 prints:: 3943 # traditional ZIP code 3944 12345 3945 ['12345'] 3946 3947 # ZIP+4 form 3948 12101-0001 3949 ['12101-0001'] 3950 3951 # invalid ZIP 3952 98765- 3953 ^ 3954 FAIL: Expected end of text (at char 5), (line:1, col:6) 3955 """
3956 - def __init__( self, expr, default=_optionalNotMatched ):
3957 super(Optional,self).__init__( expr, savelist=False ) 3958 self.saveAsList = self.expr.saveAsList 3959 self.defaultValue = default 3960 self.mayReturnEmpty = True
3961
3962 - def parseImpl( self, instring, loc, doActions=True ):
3963 try: 3964 loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False ) 3965 except (ParseException,IndexError): 3966 if self.defaultValue is not _optionalNotMatched: 3967 if self.expr.resultsName: 3968 tokens = ParseResults([ self.defaultValue ]) 3969 tokens[self.expr.resultsName] = self.defaultValue 3970 else: 3971 tokens = [ self.defaultValue ] 3972 else: 3973 tokens = [] 3974 return loc, tokens
3975
3976 - def __str__( self ):
3977 if hasattr(self,"name"): 3978 return self.name 3979 3980 if self.strRepr is None: 3981 self.strRepr = "[" + _ustr(self.expr) + "]" 3982 3983 return self.strRepr
3984
3985 -class SkipTo(ParseElementEnhance):
3986 """ 3987 Token for skipping over all undefined text until the matched expression is found. 3988 3989 Parameters: 3990 - expr - target expression marking the end of the data to be skipped 3991 - include - (default=C{False}) if True, the target expression is also parsed 3992 (the skipped text and target expression are returned as a 2-element list). 3993 - ignore - (default=C{None}) used to define grammars (typically quoted strings and 3994 comments) that might contain false matches to the target expression 3995 - failOn - (default=C{None}) define expressions that are not allowed to be 3996 included in the skipped test; if found before the target expression is found, 3997 the SkipTo is not a match 3998 3999 Example:: 4000 report = ''' 4001 Outstanding Issues Report - 1 Jan 2000 4002 4003 # | Severity | Description | Days Open 4004 -----+----------+-------------------------------------------+----------- 4005 101 | Critical | Intermittent system crash | 6 4006 94 | Cosmetic | Spelling error on Login ('log|n') | 14 4007 79 | Minor | System slow when running too many reports | 47 4008 ''' 4009 integer = Word(nums) 4010 SEP = Suppress('|') 4011 # use SkipTo to simply match everything up until the next SEP 4012 # - ignore quoted strings, so that a '|' character inside a quoted string does not match 4013 # - parse action will call token.strip() for each matched token, i.e., the description body 4014 string_data = SkipTo(SEP, ignore=quotedString) 4015 string_data.setParseAction(tokenMap(str.strip)) 4016 ticket_expr = (integer("issue_num") + SEP 4017 + string_data("sev") + SEP 4018 + string_data("desc") + SEP 4019 + integer("days_open")) 4020 4021 for tkt in ticket_expr.searchString(report): 4022 print tkt.dump() 4023 prints:: 4024 ['101', 'Critical', 'Intermittent system crash', '6'] 4025 - days_open: 6 4026 - desc: Intermittent system crash 4027 - issue_num: 101 4028 - sev: Critical 4029 ['94', 'Cosmetic', "Spelling error on Login ('log|n')", '14'] 4030 - days_open: 14 4031 - desc: Spelling error on Login ('log|n') 4032 - issue_num: 94 4033 - sev: Cosmetic 4034 ['79', 'Minor', 'System slow when running too many reports', '47'] 4035 - days_open: 47 4036 - desc: System slow when running too many reports 4037 - issue_num: 79 4038 - sev: Minor 4039 """
4040 - def __init__( self, other, include=False, ignore=None, failOn=None ):
4041 super( SkipTo, self ).__init__( other ) 4042 self.ignoreExpr = ignore 4043 self.mayReturnEmpty = True 4044 self.mayIndexError = False 4045 self.includeMatch = include 4046 self.asList = False 4047 if isinstance(failOn, basestring): 4048 self.failOn = ParserElement._literalStringClass(failOn) 4049 else: 4050 self.failOn = failOn 4051 self.errmsg = "No match found for "+_ustr(self.expr)
4052
4053 - def parseImpl( self, instring, loc, doActions=True ):
4054 startloc = loc 4055 instrlen = len(instring) 4056 expr = self.expr 4057 expr_parse = self.expr._parse 4058 self_failOn_canParseNext = self.failOn.canParseNext if self.failOn is not None else None 4059 self_ignoreExpr_tryParse = self.ignoreExpr.tryParse if self.ignoreExpr is not None else None 4060 4061 tmploc = loc 4062 while tmploc <= instrlen: 4063 if self_failOn_canParseNext is not None: 4064 # break if failOn expression matches 4065 if self_failOn_canParseNext(instring, tmploc): 4066 break 4067 4068 if self_ignoreExpr_tryParse is not None: 4069 # advance past ignore expressions 4070 while 1: 4071 try: 4072 tmploc = self_ignoreExpr_tryParse(instring, tmploc) 4073 except ParseBaseException: 4074 break 4075 4076 try: 4077 expr_parse(instring, tmploc, doActions=False, callPreParse=False) 4078 except (ParseException, IndexError): 4079 # no match, advance loc in string 4080 tmploc += 1 4081 else: 4082 # matched skipto expr, done 4083 break 4084 4085 else: 4086 # ran off the end of the input string without matching skipto expr, fail 4087 raise ParseException(instring, loc, self.errmsg, self) 4088 4089 # build up return values 4090 loc = tmploc 4091 skiptext = instring[startloc:loc] 4092 skipresult = ParseResults(skiptext) 4093 4094 if self.includeMatch: 4095 loc, mat = expr_parse(instring,loc,doActions,callPreParse=False) 4096 skipresult += mat 4097 4098 return loc, skipresult
4099
4100 -class Forward(ParseElementEnhance):
4101 """ 4102 Forward declaration of an expression to be defined later - 4103 used for recursive grammars, such as algebraic infix notation. 4104 When the expression is known, it is assigned to the C{Forward} variable using the '<<' operator. 4105 4106 Note: take care when assigning to C{Forward} not to overlook precedence of operators. 4107 Specifically, '|' has a lower precedence than '<<', so that:: 4108 fwdExpr << a | b | c 4109 will actually be evaluated as:: 4110 (fwdExpr << a) | b | c 4111 thereby leaving b and c out as parseable alternatives. It is recommended that you 4112 explicitly group the values inserted into the C{Forward}:: 4113 fwdExpr << (a | b | c) 4114 Converting to use the '<<=' operator instead will avoid this problem. 4115 4116 See L{ParseResults.pprint} for an example of a recursive parser created using 4117 C{Forward}. 4118 """
4119 - def __init__( self, other=None ):
4120 super(Forward,self).__init__( other, savelist=False )
4121
4122 - def __lshift__( self, other ):
4123 if isinstance( other, basestring ): 4124 other = ParserElement._literalStringClass(other) 4125 self.expr = other 4126 self.strRepr = None 4127 self.mayIndexError = self.expr.mayIndexError 4128 self.mayReturnEmpty = self.expr.mayReturnEmpty 4129 self.setWhitespaceChars( self.expr.whiteChars ) 4130 self.skipWhitespace = self.expr.skipWhitespace 4131 self.saveAsList = self.expr.saveAsList 4132 self.ignoreExprs.extend(self.expr.ignoreExprs) 4133 return self
4134
4135 - def __ilshift__(self, other):
4136 return self << other
4137
4138 - def leaveWhitespace( self ):
4139 self.skipWhitespace = False 4140 return self
4141
4142 - def streamline( self ):
4143 if not self.streamlined: 4144 self.streamlined = True 4145 if self.expr is not None: 4146 self.expr.streamline() 4147 return self
4148
4149 - def validate( self, validateTrace=[] ):
4150 if self not in validateTrace: 4151 tmp = validateTrace[:]+[self] 4152 if self.expr is not None: 4153 self.expr.validate(tmp) 4154 self.checkRecursion([])
4155
4156 - def __str__( self ):
4157 if hasattr(self,"name"): 4158 return self.name 4159 return self.__class__.__name__ + ": ..." 4160 4161 # stubbed out for now - creates awful memory and perf issues 4162 self._revertClass = self.__class__ 4163 self.__class__ = _ForwardNoRecurse 4164 try: 4165 if self.expr is not None: 4166 retString = _ustr(self.expr) 4167 else: 4168 retString = "None" 4169 finally: 4170 self.__class__ = self._revertClass 4171 return self.__class__.__name__ + ": " + retString
4172
4173 - def copy(self):
4174 if self.expr is not None: 4175 return super(Forward,self).copy() 4176 else: 4177 ret = Forward() 4178 ret <<= self 4179 return ret
4180
4181 -class _ForwardNoRecurse(Forward):
4182 - def __str__( self ):
4183 return "..."
4184
4185 -class TokenConverter(ParseElementEnhance):
4186 """ 4187 Abstract subclass of C{ParseExpression}, for converting parsed results. 4188 """
4189 - def __init__( self, expr, savelist=False ):
4190 super(TokenConverter,self).__init__( expr )#, savelist ) 4191 self.saveAsList = False
4192
4193 -class Combine(TokenConverter):
4194 """ 4195 Converter to concatenate all matching tokens to a single string. 4196 By default, the matching patterns must also be contiguous in the input string; 4197 this can be disabled by specifying C{'adjacent=False'} in the constructor. 4198 4199 Example:: 4200 real = Word(nums) + '.' + Word(nums) 4201 print(real.parseString('3.1416')) # -> ['3', '.', '1416'] 4202 # will also erroneously match the following 4203 print(real.parseString('3. 1416')) # -> ['3', '.', '1416'] 4204 4205 real = Combine(Word(nums) + '.' + Word(nums)) 4206 print(real.parseString('3.1416')) # -> ['3.1416'] 4207 # no match when there are internal spaces 4208 print(real.parseString('3. 1416')) # -> Exception: Expected W:(0123...) 4209 """
4210 - def __init__( self, expr, joinString="", adjacent=True ):
4211 super(Combine,self).__init__( expr ) 4212 # suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself 4213 if adjacent: 4214 self.leaveWhitespace() 4215 self.adjacent = adjacent 4216 self.skipWhitespace = True 4217 self.joinString = joinString 4218 self.callPreparse = True
4219
4220 - def ignore( self, other ):
4221 if self.adjacent: 4222 ParserElement.ignore(self, other) 4223 else: 4224 super( Combine, self).ignore( other ) 4225 return self
4226
4227 - def postParse( self, instring, loc, tokenlist ):
4228 retToks = tokenlist.copy() 4229 del retToks[:] 4230 retToks += ParseResults([ "".join(tokenlist._asStringList(self.joinString)) ], modal=self.modalResults) 4231 4232 if self.resultsName and retToks.haskeys(): 4233 return [ retToks ] 4234 else: 4235 return retToks
4236
4237 -class Group(TokenConverter):
4238 """ 4239 Converter to return the matched tokens as a list - useful for returning tokens of C{L{ZeroOrMore}} and C{L{OneOrMore}} expressions. 4240 4241 Example:: 4242 ident = Word(alphas) 4243 num = Word(nums) 4244 term = ident | num 4245 func = ident + Optional(delimitedList(term)) 4246 print(func.parseString("fn a,b,100")) # -> ['fn', 'a', 'b', '100'] 4247 4248 func = ident + Group(Optional(delimitedList(term))) 4249 print(func.parseString("fn a,b,100")) # -> ['fn', ['a', 'b', '100']] 4250 """
4251 - def __init__( self, expr ):
4252 super(Group,self).__init__( expr ) 4253 self.saveAsList = True
4254
4255 - def postParse( self, instring, loc, tokenlist ):
4256 return [ tokenlist ]
4257
4258 -class Dict(TokenConverter):
4259 """ 4260 Converter to return a repetitive expression as a list, but also as a dictionary. 4261 Each element can also be referenced using the first token in the expression as its key. 4262 Useful for tabular report scraping when the first column can be used as a item key. 4263 4264 Example:: 4265 data_word = Word(alphas) 4266 label = data_word + FollowedBy(':') 4267 attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join)) 4268 4269 text = "shape: SQUARE posn: upper left color: light blue texture: burlap" 4270 attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) 4271 4272 # print attributes as plain groups 4273 print(OneOrMore(attr_expr).parseString(text).dump()) 4274 4275 # instead of OneOrMore(expr), parse using Dict(OneOrMore(Group(expr))) - Dict will auto-assign names 4276 result = Dict(OneOrMore(Group(attr_expr))).parseString(text) 4277 print(result.dump()) 4278 4279 # access named fields as dict entries, or output as dict 4280 print(result['shape']) 4281 print(result.asDict()) 4282 prints:: 4283 ['shape', 'SQUARE', 'posn', 'upper left', 'color', 'light blue', 'texture', 'burlap'] 4284 4285 [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']] 4286 - color: light blue 4287 - posn: upper left 4288 - shape: SQUARE 4289 - texture: burlap 4290 SQUARE 4291 {'color': 'light blue', 'posn': 'upper left', 'texture': 'burlap', 'shape': 'SQUARE'} 4292 See more examples at L{ParseResults} of accessing fields by results name. 4293 """
4294 - def __init__( self, expr ):
4295 super(Dict,self).__init__( expr ) 4296 self.saveAsList = True
4297
4298 - def postParse( self, instring, loc, tokenlist ):
4299 for i,tok in enumerate(tokenlist): 4300 if len(tok) == 0: 4301 continue 4302 ikey = tok[0] 4303 if isinstance(ikey,int): 4304 ikey = _ustr(tok[0]).strip() 4305 if len(tok)==1: 4306 tokenlist[ikey] = _ParseResultsWithOffset("",i) 4307 elif len(tok)==2 and not isinstance(tok[1],ParseResults): 4308 tokenlist[ikey] = _ParseResultsWithOffset(tok[1],i) 4309 else: 4310 dictvalue = tok.copy() #ParseResults(i) 4311 del dictvalue[0] 4312 if len(dictvalue)!= 1 or (isinstance(dictvalue,ParseResults) and dictvalue.haskeys()): 4313 tokenlist[ikey] = _ParseResultsWithOffset(dictvalue,i) 4314 else: 4315 tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0],i) 4316 4317 if self.resultsName: 4318 return [ tokenlist ] 4319 else: 4320 return tokenlist
4321
4322 4323 -class Suppress(TokenConverter):
4324 """ 4325 Converter for ignoring the results of a parsed expression. 4326 4327 Example:: 4328 source = "a, b, c,d" 4329 wd = Word(alphas) 4330 wd_list1 = wd + ZeroOrMore(',' + wd) 4331 print(wd_list1.parseString(source)) 4332 4333 # often, delimiters that are useful during parsing are just in the 4334 # way afterward - use Suppress to keep them out of the parsed output 4335 wd_list2 = wd + ZeroOrMore(Suppress(',') + wd) 4336 print(wd_list2.parseString(source)) 4337 prints:: 4338 ['a', ',', 'b', ',', 'c', ',', 'd'] 4339 ['a', 'b', 'c', 'd'] 4340 (See also L{delimitedList}.) 4341 """
4342 - def postParse( self, instring, loc, tokenlist ):
4343 return []
4344
4345 - def suppress( self ):
4346 return self
4347
4348 4349 -class OnlyOnce(object):
4350 """ 4351 Wrapper for parse actions, to ensure they are only called once. 4352 """
4353 - def __init__(self, methodCall):
4354 self.callable = _trim_arity(methodCall) 4355 self.called = False
4356 - def __call__(self,s,l,t):
4357 if not self.called: 4358 results = self.callable(s,l,t) 4359 self.called = True 4360 return results 4361 raise ParseException(s,l,"")
4362 - def reset(self):
4363 self.called = False
4364
4365 -def traceParseAction(f):
4366 """ 4367 Decorator for debugging parse actions. 4368 4369 When the parse action is called, this decorator will print C{">> entering I{method-name}(line:I{current_source_line}, I{parse_location}, I{matched_tokens})".} 4370 When the parse action completes, the decorator will print C{"<<"} followed by the returned value, or any exception that the parse action raised. 4371 4372 Example:: 4373 wd = Word(alphas) 4374 4375 @traceParseAction 4376 def remove_duplicate_chars(tokens): 4377 return ''.join(sorted(set(''.join(tokens))) 4378 4379 wds = OneOrMore(wd).setParseAction(remove_duplicate_chars) 4380 print(wds.parseString("slkdjs sld sldd sdlf sdljf")) 4381 prints:: 4382 >>entering remove_duplicate_chars(line: 'slkdjs sld sldd sdlf sdljf', 0, (['slkdjs', 'sld', 'sldd', 'sdlf', 'sdljf'], {})) 4383 <<leaving remove_duplicate_chars (ret: 'dfjkls') 4384 ['dfjkls'] 4385 """ 4386 f = _trim_arity(f) 4387 def z(*paArgs): 4388 thisFunc = f.__name__ 4389 s,l,t = paArgs[-3:] 4390 if len(paArgs)>3: 4391 thisFunc = paArgs[0].__class__.__name__ + '.' + thisFunc 4392 sys.stderr.write( ">>entering %s(line: '%s', %d, %r)\n" % (thisFunc,line(l,s),l,t) ) 4393 try: 4394 ret = f(*paArgs) 4395 except Exception as exc: 4396 sys.stderr.write( "<<leaving %s (exception: %s)\n" % (thisFunc,exc) ) 4397 raise 4398 sys.stderr.write( "<<leaving %s (ret: %r)\n" % (thisFunc,ret) ) 4399 return ret
4400 try: 4401 z.__name__ = f.__name__ 4402 except AttributeError: 4403 pass 4404 return z 4405
4406 # 4407 # global helpers 4408 # 4409 -def delimitedList( expr, delim=",", combine=False ):
4410 """ 4411 Helper to define a delimited list of expressions - the delimiter defaults to ','. 4412 By default, the list elements and delimiters can have intervening whitespace, and 4413 comments, but this can be overridden by passing C{combine=True} in the constructor. 4414 If C{combine} is set to C{True}, the matching tokens are returned as a single token 4415 string, with the delimiters included; otherwise, the matching tokens are returned 4416 as a list of tokens, with the delimiters suppressed. 4417 4418 Example:: 4419 delimitedList(Word(alphas)).parseString("aa,bb,cc") # -> ['aa', 'bb', 'cc'] 4420 delimitedList(Word(hexnums), delim=':', combine=True).parseString("AA:BB:CC:DD:EE") # -> ['AA:BB:CC:DD:EE'] 4421 """ 4422 dlName = _ustr(expr)+" ["+_ustr(delim)+" "+_ustr(expr)+"]..." 4423 if combine: 4424 return Combine( expr + ZeroOrMore( delim + expr ) ).setName(dlName) 4425 else: 4426 return ( expr + ZeroOrMore( Suppress( delim ) + expr ) ).setName(dlName)
4427
4428 -def countedArray( expr, intExpr=None ):
4429 """ 4430 Helper to define a counted list of expressions. 4431 This helper defines a pattern of the form:: 4432 integer expr expr expr... 4433 where the leading integer tells how many expr expressions follow. 4434 The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed. 4435 4436 If C{intExpr} is specified, it should be a pyparsing expression that produces an integer value. 4437 4438 Example:: 4439 countedArray(Word(alphas)).parseString('2 ab cd ef') # -> ['ab', 'cd'] 4440 4441 # in this parser, the leading integer value is given in binary, 4442 # '10' indicating that 2 values are in the array 4443 binaryConstant = Word('01').setParseAction(lambda t: int(t[0], 2)) 4444 countedArray(Word(alphas), intExpr=binaryConstant).parseString('10 ab cd ef') # -> ['ab', 'cd'] 4445 """ 4446 arrayExpr = Forward() 4447 def countFieldParseAction(s,l,t): 4448 n = t[0] 4449 arrayExpr << (n and Group(And([expr]*n)) or Group(empty)) 4450 return []
4451 if intExpr is None: 4452 intExpr = Word(nums).setParseAction(lambda t:int(t[0])) 4453 else: 4454 intExpr = intExpr.copy() 4455 intExpr.setName("arrayLen") 4456 intExpr.addParseAction(countFieldParseAction, callDuringTry=True) 4457 return ( intExpr + arrayExpr ).setName('(len) ' + _ustr(expr) + '...') 4458
4459 -def _flatten(L):
4460 ret = [] 4461 for i in L: 4462 if isinstance(i,list): 4463 ret.extend(_flatten(i)) 4464 else: 4465 ret.append(i) 4466 return ret
4467
4468 -def matchPreviousLiteral(expr):
4469 """ 4470 Helper to define an expression that is indirectly defined from 4471 the tokens matched in a previous expression, that is, it looks 4472 for a 'repeat' of a previous expression. For example:: 4473 first = Word(nums) 4474 second = matchPreviousLiteral(first) 4475 matchExpr = first + ":" + second 4476 will match C{"1:1"}, but not C{"1:2"}. Because this matches a 4477 previous literal, will also match the leading C{"1:1"} in C{"1:10"}. 4478 If this is not desired, use C{matchPreviousExpr}. 4479 Do I{not} use with packrat parsing enabled. 4480 """ 4481 rep = Forward() 4482 def copyTokenToRepeater(s,l,t): 4483 if t: 4484 if len(t) == 1: 4485 rep << t[0] 4486 else: 4487 # flatten t tokens 4488 tflat = _flatten(t.asList()) 4489 rep << And(Literal(tt) for tt in tflat) 4490 else: 4491 rep << Empty()
4492 expr.addParseAction(copyTokenToRepeater, callDuringTry=True) 4493 rep.setName('(prev) ' + _ustr(expr)) 4494 return rep 4495
4496 -def matchPreviousExpr(expr):
4497 """ 4498 Helper to define an expression that is indirectly defined from 4499 the tokens matched in a previous expression, that is, it looks 4500 for a 'repeat' of a previous expression. For example:: 4501 first = Word(nums) 4502 second = matchPreviousExpr(first) 4503 matchExpr = first + ":" + second 4504 will match C{"1:1"}, but not C{"1:2"}. Because this matches by 4505 expressions, will I{not} match the leading C{"1:1"} in C{"1:10"}; 4506 the expressions are evaluated first, and then compared, so 4507 C{"1"} is compared with C{"10"}. 4508 Do I{not} use with packrat parsing enabled. 4509 """ 4510 rep = Forward() 4511 e2 = expr.copy() 4512 rep <<= e2 4513 def copyTokenToRepeater(s,l,t): 4514 matchTokens = _flatten(t.asList()) 4515 def mustMatchTheseTokens(s,l,t): 4516 theseTokens = _flatten(t.asList()) 4517 if theseTokens != matchTokens: 4518 raise ParseException("",0,"")
4519 rep.setParseAction( mustMatchTheseTokens, callDuringTry=True ) 4520 expr.addParseAction(copyTokenToRepeater, callDuringTry=True) 4521 rep.setName('(prev) ' + _ustr(expr)) 4522 return rep 4523
4524 -def _escapeRegexRangeChars(s):
4525 #~ escape these chars: ^-] 4526 for c in r"\^-]": 4527 s = s.replace(c,_bslash+c) 4528 s = s.replace("\n",r"\n") 4529 s = s.replace("\t",r"\t") 4530 return _ustr(s)
4531
4532 -def oneOf( strs, caseless=False, useRegex=True ):
4533 """ 4534 Helper to quickly define a set of alternative Literals, and makes sure to do 4535 longest-first testing when there is a conflict, regardless of the input order, 4536 but returns a C{L{MatchFirst}} for best performance. 4537 4538 Parameters: 4539 - strs - a string of space-delimited literals, or a collection of string literals 4540 - caseless - (default=C{False}) - treat all literals as caseless 4541 - useRegex - (default=C{True}) - as an optimization, will generate a Regex 4542 object; otherwise, will generate a C{MatchFirst} object (if C{caseless=True}, or 4543 if creating a C{Regex} raises an exception) 4544 4545 Example:: 4546 comp_oper = oneOf("< = > <= >= !=") 4547 var = Word(alphas) 4548 number = Word(nums) 4549 term = var | number 4550 comparison_expr = term + comp_oper + term 4551 print(comparison_expr.searchString("B = 12 AA=23 B<=AA AA>12")) 4552 prints:: 4553 [['B', '=', '12'], ['AA', '=', '23'], ['B', '<=', 'AA'], ['AA', '>', '12']] 4554 """ 4555 if caseless: 4556 isequal = ( lambda a,b: a.upper() == b.upper() ) 4557 masks = ( lambda a,b: b.upper().startswith(a.upper()) ) 4558 parseElementClass = CaselessLiteral 4559 else: 4560 isequal = ( lambda a,b: a == b ) 4561 masks = ( lambda a,b: b.startswith(a) ) 4562 parseElementClass = Literal 4563 4564 symbols = [] 4565 if isinstance(strs,basestring): 4566 symbols = strs.split() 4567 elif isinstance(strs, collections.Iterable): 4568 symbols = list(strs) 4569 else: 4570 warnings.warn("Invalid argument to oneOf, expected string or iterable", 4571 SyntaxWarning, stacklevel=2) 4572 if not symbols: 4573 return NoMatch() 4574 4575 i = 0 4576 while i < len(symbols)-1: 4577 cur = symbols[i] 4578 for j,other in enumerate(symbols[i+1:]): 4579 if ( isequal(other, cur) ): 4580 del symbols[i+j+1] 4581 break 4582 elif ( masks(cur, other) ): 4583 del symbols[i+j+1] 4584 symbols.insert(i,other) 4585 cur = other 4586 break 4587 else: 4588 i += 1 4589 4590 if not caseless and useRegex: 4591 #~ print (strs,"->", "|".join( [ _escapeRegexChars(sym) for sym in symbols] )) 4592 try: 4593 if len(symbols)==len("".join(symbols)): 4594 return Regex( "[%s]" % "".join(_escapeRegexRangeChars(sym) for sym in symbols) ).setName(' | '.join(symbols)) 4595 else: 4596 return Regex( "|".join(re.escape(sym) for sym in symbols) ).setName(' | '.join(symbols)) 4597 except Exception: 4598 warnings.warn("Exception creating Regex for oneOf, building MatchFirst", 4599 SyntaxWarning, stacklevel=2) 4600 4601 4602 # last resort, just use MatchFirst 4603 return MatchFirst(parseElementClass(sym) for sym in symbols).setName(' | '.join(symbols))
4604
4605 -def dictOf( key, value ):
4606 """ 4607 Helper to easily and clearly define a dictionary by specifying the respective patterns 4608 for the key and value. Takes care of defining the C{L{Dict}}, C{L{ZeroOrMore}}, and C{L{Group}} tokens 4609 in the proper order. The key pattern can include delimiting markers or punctuation, 4610 as long as they are suppressed, thereby leaving the significant key text. The value 4611 pattern can include named results, so that the C{Dict} results can include named token 4612 fields. 4613 4614 Example:: 4615 text = "shape: SQUARE posn: upper left color: light blue texture: burlap" 4616 attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) 4617 print(OneOrMore(attr_expr).parseString(text).dump()) 4618 4619 attr_label = label 4620 attr_value = Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join) 4621 4622 # similar to Dict, but simpler call format 4623 result = dictOf(attr_label, attr_value).parseString(text) 4624 print(result.dump()) 4625 print(result['shape']) 4626 print(result.shape) # object attribute access works too 4627 print(result.asDict()) 4628 prints:: 4629 [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']] 4630 - color: light blue 4631 - posn: upper left 4632 - shape: SQUARE 4633 - texture: burlap 4634 SQUARE 4635 SQUARE 4636 {'color': 'light blue', 'shape': 'SQUARE', 'posn': 'upper left', 'texture': 'burlap'} 4637 """ 4638 return Dict( ZeroOrMore( Group ( key + value ) ) )
4639
4640 -def originalTextFor(expr, asString=True):
4641 """ 4642 Helper to return the original, untokenized text for a given expression. Useful to 4643 restore the parsed fields of an HTML start tag into the raw tag text itself, or to 4644 revert separate tokens with intervening whitespace back to the original matching 4645 input text. By default, returns astring containing the original parsed text. 4646 4647 If the optional C{asString} argument is passed as C{False}, then the return value is a 4648 C{L{ParseResults}} containing any results names that were originally matched, and a 4649 single token containing the original matched text from the input string. So if 4650 the expression passed to C{L{originalTextFor}} contains expressions with defined 4651 results names, you must set C{asString} to C{False} if you want to preserve those 4652 results name values. 4653 4654 Example:: 4655 src = "this is test <b> bold <i>text</i> </b> normal text " 4656 for tag in ("b","i"): 4657 opener,closer = makeHTMLTags(tag) 4658 patt = originalTextFor(opener + SkipTo(closer) + closer) 4659 print(patt.searchString(src)[0]) 4660 prints:: 4661 ['<b> bold <i>text</i> </b>'] 4662 ['<i>text</i>'] 4663 """ 4664 locMarker = Empty().setParseAction(lambda s,loc,t: loc) 4665 endlocMarker = locMarker.copy() 4666 endlocMarker.callPreparse = False 4667 matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end") 4668 if asString: 4669 extractText = lambda s,l,t: s[t._original_start:t._original_end] 4670 else: 4671 def extractText(s,l,t): 4672 t[:] = [s[t.pop('_original_start'):t.pop('_original_end')]]
4673 matchExpr.setParseAction(extractText) 4674 matchExpr.ignoreExprs = expr.ignoreExprs 4675 return matchExpr 4676
4677 -def ungroup(expr):
4678 """ 4679 Helper to undo pyparsing's default grouping of And expressions, even 4680 if all but one are non-empty. 4681 """ 4682 return TokenConverter(expr).setParseAction(lambda t:t[0]) 4683
4684 -def locatedExpr(expr):
4685 """ 4686 Helper to decorate a returned token with its starting and ending locations in the input string. 4687 This helper adds the following results names: 4688 - locn_start = location where matched expression begins 4689 - locn_end = location where matched expression ends 4690 - value = the actual parsed results 4691 4692 Be careful if the input text contains C{<TAB>} characters, you may want to call 4693 C{L{ParserElement.parseWithTabs}} 4694 4695 Example:: 4696 wd = Word(alphas) 4697 for match in locatedExpr(wd).searchString("ljsdf123lksdjjf123lkkjj1222"): 4698 print(match) 4699 prints:: 4700 [[0, 'ljsdf', 5]] 4701 [[8, 'lksdjjf', 15]] 4702 [[18, 'lkkjj', 23]] 4703 """ 4704 locator = Empty().setParseAction(lambda s,l,t: l) 4705 return Group(locator("locn_start") + expr("value") + locator.copy().leaveWhitespace()("locn_end"))
4706 4707 4708 # convenience constants for positional expressions 4709 empty = Empty().setName("empty") 4710 lineStart = LineStart().setName("lineStart") 4711 lineEnd = LineEnd().setName("lineEnd") 4712 stringStart = StringStart().setName("stringStart") 4713 stringEnd = StringEnd().setName("stringEnd") 4714 4715 _escapedPunc = Word( _bslash, r"\[]-*.$+^?()~ ", exact=2 ).setParseAction(lambda s,l,t:t[0][1]) 4716 _escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").setParseAction(lambda s,l,t:unichr(int(t[0].lstrip(r'\0x'),16))) 4717 _escapedOctChar = Regex(r"\\0[0-7]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],8))) 4718 _singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(printables, excludeChars=r'\]', exact=1) | Regex(r"\w", re.UNICODE) 4719 _charRange = Group(_singleChar + Suppress("-") + _singleChar) 4720 _reBracketExpr = Literal("[") + Optional("^").setResultsName("negate") + Group( OneOrMore( _charRange | _singleChar ) ).setResultsName("body") + "]"
4721 4722 -def srange(s):
4723 r""" 4724 Helper to easily define string ranges for use in Word construction. Borrows 4725 syntax from regexp '[]' string range definitions:: 4726 srange("[0-9]") -> "0123456789" 4727 srange("[a-z]") -> "abcdefghijklmnopqrstuvwxyz" 4728 srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_" 4729 The input string must be enclosed in []'s, and the returned string is the expanded 4730 character set joined into a single string. 4731 The values enclosed in the []'s may be: 4732 - a single character 4733 - an escaped character with a leading backslash (such as C{\-} or C{\]}) 4734 - an escaped hex character with a leading C{'\x'} (C{\x21}, which is a C{'!'} character) 4735 (C{\0x##} is also supported for backwards compatibility) 4736 - an escaped octal character with a leading C{'\0'} (C{\041}, which is a C{'!'} character) 4737 - a range of any of the above, separated by a dash (C{'a-z'}, etc.) 4738 - any combination of the above (C{'aeiouy'}, C{'a-zA-Z0-9_$'}, etc.) 4739 """ 4740 _expanded = lambda p: p if not isinstance(p,ParseResults) else ''.join(unichr(c) for c in range(ord(p[0]),ord(p[1])+1)) 4741 try: 4742 return "".join(_expanded(part) for part in _reBracketExpr.parseString(s).body) 4743 except Exception: 4744 return ""
4745
4746 -def matchOnlyAtCol(n):
4747 """ 4748 Helper method for defining parse actions that require matching at a specific 4749 column in the input text. 4750 """ 4751 def verifyCol(strg,locn,toks): 4752 if col(locn,strg) != n: 4753 raise ParseException(strg,locn,"matched token not at column %d" % n)
4754 return verifyCol 4755
4756 -def replaceWith(replStr):
4757 """ 4758 Helper method for common parse actions that simply return a literal value. Especially 4759 useful when used with C{L{transformString<ParserElement.transformString>}()}. 4760 4761 Example:: 4762 num = Word(nums).setParseAction(lambda toks: int(toks[0])) 4763 na = oneOf("N/A NA").setParseAction(replaceWith(math.nan)) 4764 term = na | num 4765 4766 OneOrMore(term).parseString("324 234 N/A 234") # -> [324, 234, nan, 234] 4767 """ 4768 return lambda s,l,t: [replStr]
4769
4770 -def removeQuotes(s,l,t):
4771 """ 4772 Helper parse action for removing quotation marks from parsed quoted strings. 4773 4774 Example:: 4775 # by default, quotation marks are included in parsed results 4776 quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["'Now is the Winter of our Discontent'"] 4777 4778 # use removeQuotes to strip quotation marks from parsed results 4779 quotedString.setParseAction(removeQuotes) 4780 quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["Now is the Winter of our Discontent"] 4781 """ 4782 return t[0][1:-1]
4783
4784 -def tokenMap(func, *args):
4785 """ 4786 Helper to define a parse action by mapping a function to all elements of a ParseResults list.If any additional 4787 args are passed, they are forwarded to the given function as additional arguments after 4788 the token, as in C{hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16))}, which will convert the 4789 parsed data to an integer using base 16. 4790 4791 Example (compare the last to example in L{ParserElement.transformString}:: 4792 hex_ints = OneOrMore(Word(hexnums)).setParseAction(tokenMap(int, 16)) 4793 hex_ints.runTests(''' 4794 00 11 22 aa FF 0a 0d 1a 4795 ''') 4796 4797 upperword = Word(alphas).setParseAction(tokenMap(str.upper)) 4798 OneOrMore(upperword).runTests(''' 4799 my kingdom for a horse 4800 ''') 4801 4802 wd = Word(alphas).setParseAction(tokenMap(str.title)) 4803 OneOrMore(wd).setParseAction(' '.join).runTests(''' 4804 now is the winter of our discontent made glorious summer by this sun of york 4805 ''') 4806 prints:: 4807 00 11 22 aa FF 0a 0d 1a 4808 [0, 17, 34, 170, 255, 10, 13, 26] 4809 4810 my kingdom for a horse 4811 ['MY', 'KINGDOM', 'FOR', 'A', 'HORSE'] 4812 4813 now is the winter of our discontent made glorious summer by this sun of york 4814 ['Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York'] 4815 """ 4816 def pa(s,l,t): 4817 return [func(tokn, *args) for tokn in t]
4818 4819 try: 4820 func_name = getattr(func, '__name__', 4821 getattr(func, '__class__').__name__) 4822 except Exception: 4823 func_name = str(func) 4824 pa.__name__ = func_name 4825 4826 return pa 4827 4828 upcaseTokens = tokenMap(lambda t: _ustr(t).upper()) 4829 """(Deprecated) Helper parse action to convert tokens to upper case. Deprecated in favor of L{pyparsing_common.upcaseTokens}""" 4830 4831 downcaseTokens = tokenMap(lambda t: _ustr(t).lower()) 4832 """(Deprecated) Helper parse action to convert tokens to lower case. Deprecated in favor of L{pyparsing_common.downcaseTokens}"""
4833 4834 -def _makeTags(tagStr, xml):
4835 """Internal helper to construct opening and closing tag expressions, given a tag name""" 4836 if isinstance(tagStr,basestring): 4837 resname = tagStr 4838 tagStr = Keyword(tagStr, caseless=not xml) 4839 else: 4840 resname = tagStr.name 4841 4842 tagAttrName = Word(alphas,alphanums+"_-:") 4843 if (xml): 4844 tagAttrValue = dblQuotedString.copy().setParseAction( removeQuotes ) 4845 openTag = Suppress("<") + tagStr("tag") + \ 4846 Dict(ZeroOrMore(Group( tagAttrName + Suppress("=") + tagAttrValue ))) + \ 4847 Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">") 4848 else: 4849 printablesLessRAbrack = "".join(c for c in printables if c not in ">") 4850 tagAttrValue = quotedString.copy().setParseAction( removeQuotes ) | Word(printablesLessRAbrack) 4851 openTag = Suppress("<") + tagStr("tag") + \ 4852 Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \ 4853 Optional( Suppress("=") + tagAttrValue ) ))) + \ 4854 Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">") 4855 closeTag = Combine(_L("</") + tagStr + ">") 4856 4857 openTag = openTag.setResultsName("start"+"".join(resname.replace(":"," ").title().split())).setName("<%s>" % resname) 4858 closeTag = closeTag.setResultsName("end"+"".join(resname.replace(":"," ").title().split())).setName("</%s>" % resname) 4859 openTag.tag = resname 4860 closeTag.tag = resname 4861 return openTag, closeTag
4862
4863 -def makeHTMLTags(tagStr):
4864 """ 4865 Helper to construct opening and closing tag expressions for HTML, given a tag name. Matches 4866 tags in either upper or lower case, attributes with namespaces and with quoted or unquoted values. 4867 4868 Example:: 4869 text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>' 4870 # makeHTMLTags returns pyparsing expressions for the opening and closing tags as a 2-tuple 4871 a,a_end = makeHTMLTags("A") 4872 link_expr = a + SkipTo(a_end)("link_text") + a_end 4873 4874 for link in link_expr.searchString(text): 4875 # attributes in the <A> tag (like "href" shown here) are also accessible as named results 4876 print(link.link_text, '->', link.href) 4877 prints:: 4878 pyparsing -> http://pyparsing.wikispaces.com 4879 """ 4880 return _makeTags( tagStr, False )
4881
4882 -def makeXMLTags(tagStr):
4883 """ 4884 Helper to construct opening and closing tag expressions for XML, given a tag name. Matches 4885 tags only in the given upper/lower case. 4886 4887 Example: similar to L{makeHTMLTags} 4888 """ 4889 return _makeTags( tagStr, True )
4890
4891 -def withAttribute(*args,**attrDict):
4892 """ 4893 Helper to create a validating parse action to be used with start tags created 4894 with C{L{makeXMLTags}} or C{L{makeHTMLTags}}. Use C{withAttribute} to qualify a starting tag 4895 with a required attribute value, to avoid false matches on common tags such as 4896 C{<TD>} or C{<DIV>}. 4897 4898 Call C{withAttribute} with a series of attribute names and values. Specify the list 4899 of filter attributes names and values as: 4900 - keyword arguments, as in C{(align="right")}, or 4901 - as an explicit dict with C{**} operator, when an attribute name is also a Python 4902 reserved word, as in C{**{"class":"Customer", "align":"right"}} 4903 - a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") ) 4904 For attribute names with a namespace prefix, you must use the second form. Attribute 4905 names are matched insensitive to upper/lower case. 4906 4907 If just testing for C{class} (with or without a namespace), use C{L{withClass}}. 4908 4909 To verify that the attribute exists, but without specifying a value, pass 4910 C{withAttribute.ANY_VALUE} as the value. 4911 4912 Example:: 4913 html = ''' 4914 <div> 4915 Some text 4916 <div type="grid">1 4 0 1 0</div> 4917 <div type="graph">1,3 2,3 1,1</div> 4918 <div>this has no type</div> 4919 </div> 4920 4921 ''' 4922 div,div_end = makeHTMLTags("div") 4923 4924 # only match div tag having a type attribute with value "grid" 4925 div_grid = div().setParseAction(withAttribute(type="grid")) 4926 grid_expr = div_grid + SkipTo(div | div_end)("body") 4927 for grid_header in grid_expr.searchString(html): 4928 print(grid_header.body) 4929 4930 # construct a match with any div tag having a type attribute, regardless of the value 4931 div_any_type = div().setParseAction(withAttribute(type=withAttribute.ANY_VALUE)) 4932 div_expr = div_any_type + SkipTo(div | div_end)("body") 4933 for div_header in div_expr.searchString(html): 4934 print(div_header.body) 4935 prints:: 4936 1 4 0 1 0 4937 4938 1 4 0 1 0 4939 1,3 2,3 1,1 4940 """ 4941 if args: 4942 attrs = args[:] 4943 else: 4944 attrs = attrDict.items() 4945 attrs = [(k,v) for k,v in attrs] 4946 def pa(s,l,tokens): 4947 for attrName,attrValue in attrs: 4948 if attrName not in tokens: 4949 raise ParseException(s,l,"no matching attribute " + attrName) 4950 if attrValue != withAttribute.ANY_VALUE and tokens[attrName] != attrValue: 4951 raise ParseException(s,l,"attribute '%s' has value '%s', must be '%s'" % 4952 (attrName, tokens[attrName], attrValue))
4953 return pa 4954 withAttribute.ANY_VALUE = object()
4955 4956 -def withClass(classname, namespace=''):
4957 """ 4958 Simplified version of C{L{withAttribute}} when matching on a div class - made 4959 difficult because C{class} is a reserved word in Python. 4960 4961 Example:: 4962 html = ''' 4963 <div> 4964 Some text 4965 <div class="grid">1 4 0 1 0</div> 4966 <div class="graph">1,3 2,3 1,1</div> 4967 <div>this &lt;div&gt; has no class</div> 4968 </div> 4969 4970 ''' 4971 div,div_end = makeHTMLTags("div") 4972 div_grid = div().setParseAction(withClass("grid")) 4973 4974 grid_expr = div_grid + SkipTo(div | div_end)("body") 4975 for grid_header in grid_expr.searchString(html): 4976 print(grid_header.body) 4977 4978 div_any_type = div().setParseAction(withClass(withAttribute.ANY_VALUE)) 4979 div_expr = div_any_type + SkipTo(div | div_end)("body") 4980 for div_header in div_expr.searchString(html): 4981 print(div_header.body) 4982 prints:: 4983 1 4 0 1 0 4984 4985 1 4 0 1 0 4986 1,3 2,3 1,1 4987 """ 4988 classattr = "%s:class" % namespace if namespace else "class" 4989 return withAttribute(**{classattr : classname})
4990 4991 opAssoc = _Constants() 4992 opAssoc.LEFT = object() 4993 opAssoc.RIGHT = object()
4994 4995 -def infixNotation( baseExpr, opList, lpar=Suppress('('), rpar=Suppress(')') ):
4996 """ 4997 Helper method for constructing grammars of expressions made up of 4998 operators working in a precedence hierarchy. Operators may be unary or 4999 binary, left- or right-associative. Parse actions can also be attached 5000 to operator expressions. The generated parser will also recognize the use 5001 of parentheses to override operator precedences (see example below). 5002 5003 Note: if you define a deep operator list, you may see performance issues 5004 when using infixNotation. See L{ParserElement.enablePackrat} for a 5005 mechanism to potentially improve your parser performance. 5006 5007 Parameters: 5008 - baseExpr - expression representing the most basic element for the nested 5009 - opList - list of tuples, one for each operator precedence level in the 5010 expression grammar; each tuple is of the form 5011 (opExpr, numTerms, rightLeftAssoc, parseAction), where: 5012 - opExpr is the pyparsing expression for the operator; 5013 may also be a string, which will be converted to a Literal; 5014 if numTerms is 3, opExpr is a tuple of two expressions, for the 5015 two operators separating the 3 terms 5016 - numTerms is the number of terms for this operator (must 5017 be 1, 2, or 3) 5018 - rightLeftAssoc is the indicator whether the operator is 5019 right or left associative, using the pyparsing-defined 5020 constants C{opAssoc.RIGHT} and C{opAssoc.LEFT}. 5021 - parseAction is the parse action to be associated with 5022 expressions matching this operator expression (the 5023 parse action tuple member may be omitted) 5024 - lpar - expression for matching left-parentheses (default=C{Suppress('(')}) 5025 - rpar - expression for matching right-parentheses (default=C{Suppress(')')}) 5026 5027 Example:: 5028 # simple example of four-function arithmetic with ints and variable names 5029 integer = pyparsing_common.signed_integer 5030 varname = pyparsing_common.identifier 5031 5032 arith_expr = infixNotation(integer | varname, 5033 [ 5034 ('-', 1, opAssoc.RIGHT), 5035 (oneOf('* /'), 2, opAssoc.LEFT), 5036 (oneOf('+ -'), 2, opAssoc.LEFT), 5037 ]) 5038 5039 arith_expr.runTests(''' 5040 5+3*6 5041 (5+3)*6 5042 -2--11 5043 ''', fullDump=False) 5044 prints:: 5045 5+3*6 5046 [[5, '+', [3, '*', 6]]] 5047 5048 (5+3)*6 5049 [[[5, '+', 3], '*', 6]] 5050 5051 -2--11 5052 [[['-', 2], '-', ['-', 11]]] 5053 """ 5054 ret = Forward() 5055 lastExpr = baseExpr | ( lpar + ret + rpar ) 5056 for i,operDef in enumerate(opList): 5057 opExpr,arity,rightLeftAssoc,pa = (operDef + (None,))[:4] 5058 termName = "%s term" % opExpr if arity < 3 else "%s%s term" % opExpr 5059 if arity == 3: 5060 if opExpr is None or len(opExpr) != 2: 5061 raise ValueError("if numterms=3, opExpr must be a tuple or list of two expressions") 5062 opExpr1, opExpr2 = opExpr 5063 thisExpr = Forward().setName(termName) 5064 if rightLeftAssoc == opAssoc.LEFT: 5065 if arity == 1: 5066 matchExpr = FollowedBy(lastExpr + opExpr) + Group( lastExpr + OneOrMore( opExpr ) ) 5067 elif arity == 2: 5068 if opExpr is not None: 5069 matchExpr = FollowedBy(lastExpr + opExpr + lastExpr) + Group( lastExpr + OneOrMore( opExpr + lastExpr ) ) 5070 else: 5071 matchExpr = FollowedBy(lastExpr+lastExpr) + Group( lastExpr + OneOrMore(lastExpr) ) 5072 elif arity == 3: 5073 matchExpr = FollowedBy(lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr) + \ 5074 Group( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr ) 5075 else: 5076 raise ValueError("operator must be unary (1), binary (2), or ternary (3)") 5077 elif rightLeftAssoc == opAssoc.RIGHT: 5078 if arity == 1: 5079 # try to avoid LR with this extra test 5080 if not isinstance(opExpr, Optional): 5081 opExpr = Optional(opExpr) 5082 matchExpr = FollowedBy(opExpr.expr + thisExpr) + Group( opExpr + thisExpr ) 5083 elif arity == 2: 5084 if opExpr is not None: 5085 matchExpr = FollowedBy(lastExpr + opExpr + thisExpr) + Group( lastExpr + OneOrMore( opExpr + thisExpr ) ) 5086 else: 5087 matchExpr = FollowedBy(lastExpr + thisExpr) + Group( lastExpr + OneOrMore( thisExpr ) ) 5088 elif arity == 3: 5089 matchExpr = FollowedBy(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) + \ 5090 Group( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr ) 5091 else: 5092 raise ValueError("operator must be unary (1), binary (2), or ternary (3)") 5093 else: 5094 raise ValueError("operator must indicate right or left associativity") 5095 if pa: 5096 matchExpr.setParseAction( pa ) 5097 thisExpr <<= ( matchExpr.setName(termName) | lastExpr ) 5098 lastExpr = thisExpr 5099 ret <<= lastExpr 5100 return ret
5101 5102 operatorPrecedence = infixNotation 5103 """(Deprecated) Former name of C{L{infixNotation}}, will be dropped in a future release.""" 5104 5105 dblQuotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"').setName("string enclosed in double quotes") 5106 sglQuotedString = Combine(Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("string enclosed in single quotes") 5107 quotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"'| 5108 Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("quotedString using single or double quotes") 5109 unicodeString = Combine(_L('u') + quotedString.copy()).setName("unicode string literal")
5110 5111 -def nestedExpr(opener="(", closer=")", content=None, ignoreExpr=quotedString.copy()):
5112 """ 5113 Helper method for defining nested lists enclosed in opening and closing 5114 delimiters ("(" and ")" are the default). 5115 5116 Parameters: 5117 - opener - opening character for a nested list (default=C{"("}); can also be a pyparsing expression 5118 - closer - closing character for a nested list (default=C{")"}); can also be a pyparsing expression 5119 - content - expression for items within the nested lists (default=C{None}) 5120 - ignoreExpr - expression for ignoring opening and closing delimiters (default=C{quotedString}) 5121 5122 If an expression is not provided for the content argument, the nested 5123 expression will capture all whitespace-delimited content between delimiters 5124 as a list of separate values. 5125 5126 Use the C{ignoreExpr} argument to define expressions that may contain 5127 opening or closing characters that should not be treated as opening 5128 or closing characters for nesting, such as quotedString or a comment 5129 expression. Specify multiple expressions using an C{L{Or}} or C{L{MatchFirst}}. 5130 The default is L{quotedString}, but if no expressions are to be ignored, 5131 then pass C{None} for this argument. 5132 5133 Example:: 5134 data_type = oneOf("void int short long char float double") 5135 decl_data_type = Combine(data_type + Optional(Word('*'))) 5136 ident = Word(alphas+'_', alphanums+'_') 5137 number = pyparsing_common.number 5138 arg = Group(decl_data_type + ident) 5139 LPAR,RPAR = map(Suppress, "()") 5140 5141 code_body = nestedExpr('{', '}', ignoreExpr=(quotedString | cStyleComment)) 5142 5143 c_function = (decl_data_type("type") 5144 + ident("name") 5145 + LPAR + Optional(delimitedList(arg), [])("args") + RPAR 5146 + code_body("body")) 5147 c_function.ignore(cStyleComment) 5148 5149 source_code = ''' 5150 int is_odd(int x) { 5151 return (x%2); 5152 } 5153 5154 int dec_to_hex(char hchar) { 5155 if (hchar >= '0' && hchar <= '9') { 5156 return (ord(hchar)-ord('0')); 5157 } else { 5158 return (10+ord(hchar)-ord('A')); 5159 } 5160 } 5161 ''' 5162 for func in c_function.searchString(source_code): 5163 print("%(name)s (%(type)s) args: %(args)s" % func) 5164 5165 prints:: 5166 is_odd (int) args: [['int', 'x']] 5167 dec_to_hex (int) args: [['char', 'hchar']] 5168 """ 5169 if opener == closer: 5170 raise ValueError("opening and closing strings cannot be the same") 5171 if content is None: 5172 if isinstance(opener,basestring) and isinstance(closer,basestring): 5173 if len(opener) == 1 and len(closer)==1: 5174 if ignoreExpr is not None: 5175 content = (Combine(OneOrMore(~ignoreExpr + 5176 CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS,exact=1)) 5177 ).setParseAction(lambda t:t[0].strip())) 5178 else: 5179 content = (empty.copy()+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS 5180 ).setParseAction(lambda t:t[0].strip())) 5181 else: 5182 if ignoreExpr is not None: 5183 content = (Combine(OneOrMore(~ignoreExpr + 5184 ~Literal(opener) + ~Literal(closer) + 5185 CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1)) 5186 ).setParseAction(lambda t:t[0].strip())) 5187 else: 5188 content = (Combine(OneOrMore(~Literal(opener) + ~Literal(closer) + 5189 CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1)) 5190 ).setParseAction(lambda t:t[0].strip())) 5191 else: 5192 raise ValueError("opening and closing arguments must be strings if no content expression is given") 5193 ret = Forward() 5194 if ignoreExpr is not None: 5195 ret <<= Group( Suppress(opener) + ZeroOrMore( ignoreExpr | ret | content ) + Suppress(closer) ) 5196 else: 5197 ret <<= Group( Suppress(opener) + ZeroOrMore( ret | content ) + Suppress(closer) ) 5198 ret.setName('nested %s%s expression' % (opener,closer)) 5199 return ret
5200
5201 -def indentedBlock(blockStatementExpr, indentStack, indent=True):
5202 """ 5203 Helper method for defining space-delimited indentation blocks, such as 5204 those used to define block statements in Python source code. 5205 5206 Parameters: 5207 - blockStatementExpr - expression defining syntax of statement that 5208 is repeated within the indented block 5209 - indentStack - list created by caller to manage indentation stack 5210 (multiple statementWithIndentedBlock expressions within a single grammar 5211 should share a common indentStack) 5212 - indent - boolean indicating whether block must be indented beyond the 5213 the current level; set to False for block of left-most statements 5214 (default=C{True}) 5215 5216 A valid block must contain at least one C{blockStatement}. 5217 5218 Example:: 5219 data = ''' 5220 def A(z): 5221 A1 5222 B = 100 5223 G = A2 5224 A2 5225 A3 5226 B 5227 def BB(a,b,c): 5228 BB1 5229 def BBA(): 5230 bba1 5231 bba2 5232 bba3 5233 C 5234 D 5235 def spam(x,y): 5236 def eggs(z): 5237 pass 5238 ''' 5239 5240 5241 indentStack = [1] 5242 stmt = Forward() 5243 5244 identifier = Word(alphas, alphanums) 5245 funcDecl = ("def" + identifier + Group( "(" + Optional( delimitedList(identifier) ) + ")" ) + ":") 5246 func_body = indentedBlock(stmt, indentStack) 5247 funcDef = Group( funcDecl + func_body ) 5248 5249 rvalue = Forward() 5250 funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")") 5251 rvalue << (funcCall | identifier | Word(nums)) 5252 assignment = Group(identifier + "=" + rvalue) 5253 stmt << ( funcDef | assignment | identifier ) 5254 5255 module_body = OneOrMore(stmt) 5256 5257 parseTree = module_body.parseString(data) 5258 parseTree.pprint() 5259 prints:: 5260 [['def', 5261 'A', 5262 ['(', 'z', ')'], 5263 ':', 5264 [['A1'], [['B', '=', '100']], [['G', '=', 'A2']], ['A2'], ['A3']]], 5265 'B', 5266 ['def', 5267 'BB', 5268 ['(', 'a', 'b', 'c', ')'], 5269 ':', 5270 [['BB1'], [['def', 'BBA', ['(', ')'], ':', [['bba1'], ['bba2'], ['bba3']]]]]], 5271 'C', 5272 'D', 5273 ['def', 5274 'spam', 5275 ['(', 'x', 'y', ')'], 5276 ':', 5277 [[['def', 'eggs', ['(', 'z', ')'], ':', [['pass']]]]]]] 5278 """ 5279 def checkPeerIndent(s,l,t): 5280 if l >= len(s): return 5281 curCol = col(l,s) 5282 if curCol != indentStack[-1]: 5283 if curCol > indentStack[-1]: 5284 raise ParseFatalException(s,l,"illegal nesting") 5285 raise ParseException(s,l,"not a peer entry")
5286 5287 def checkSubIndent(s,l,t): 5288 curCol = col(l,s) 5289 if curCol > indentStack[-1]: 5290 indentStack.append( curCol ) 5291 else: 5292 raise ParseException(s,l,"not a subentry") 5293 5294 def checkUnindent(s,l,t): 5295 if l >= len(s): return 5296 curCol = col(l,s) 5297 if not(indentStack and curCol < indentStack[-1] and curCol <= indentStack[-2]): 5298 raise ParseException(s,l,"not an unindent") 5299 indentStack.pop() 5300 5301 NL = OneOrMore(LineEnd().setWhitespaceChars("\t ").suppress()) 5302 INDENT = (Empty() + Empty().setParseAction(checkSubIndent)).setName('INDENT') 5303 PEER = Empty().setParseAction(checkPeerIndent).setName('') 5304 UNDENT = Empty().setParseAction(checkUnindent).setName('UNINDENT') 5305 if indent: 5306 smExpr = Group( Optional(NL) + 5307 #~ FollowedBy(blockStatementExpr) + 5308 INDENT + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) + UNDENT) 5309 else: 5310 smExpr = Group( Optional(NL) + 5311 (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) ) 5312 blockStatementExpr.ignore(_bslash + LineEnd()) 5313 return smExpr.setName('indented block') 5314 5315 alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]") 5316 punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]") 5317 5318 anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_:").setName('any tag')) 5319 _htmlEntityMap = dict(zip("gt lt amp nbsp quot apos".split(),'><& "\'')) 5320 commonHTMLEntity = Regex('&(?P<entity>' + '|'.join(_htmlEntityMap.keys()) +");").setName("common HTML entity")
5321 -def replaceHTMLEntity(t):
5322 """Helper parser action to replace common HTML entities with their special characters""" 5323 return _htmlEntityMap.get(t.entity)
5324 5325 # it's easy to get these comment structures wrong - they're very common, so may as well make them available 5326 cStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/').setName("C style comment") 5327 "Comment of the form C{/* ... */}" 5328 5329 htmlComment = Regex(r"<!--[\s\S]*?-->").setName("HTML comment") 5330 "Comment of the form C{<!-- ... -->}" 5331 5332 restOfLine = Regex(r".*").leaveWhitespace().setName("rest of line") 5333 dblSlashComment = Regex(r"//(?:\\\n|[^\n])*").setName("// comment") 5334 "Comment of the form C{// ... (to end of line)}" 5335 5336 cppStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/'| dblSlashComment).setName("C++ style comment") 5337 "Comment of either form C{L{cStyleComment}} or C{L{dblSlashComment}}" 5338 5339 javaStyleComment = cppStyleComment 5340 "Same as C{L{cppStyleComment}}" 5341 5342 pythonStyleComment = Regex(r"#.*").setName("Python style comment") 5343 "Comment of the form C{# ... (to end of line)}" 5344 5345 _commasepitem = Combine(OneOrMore(Word(printables, excludeChars=',') + 5346 Optional( Word(" \t") + 5347 ~Literal(",") + ~LineEnd() ) ) ).streamline().setName("commaItem") 5348 commaSeparatedList = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("commaSeparatedList") 5349 """(Deprecated) Predefined expression of 1 or more printable words or quoted strings, separated by commas. 5350 This expression is deprecated in favor of L{pyparsing_common.comma_separated_list}."""
5351 5352 # some other useful expressions - using lower-case class name since we are really using this as a namespace 5353 -class pyparsing_common:
5354 """ 5355 Here are some common low-level expressions that may be useful in jump-starting parser development: 5356 - numeric forms (L{integers<integer>}, L{reals<real>}, L{scientific notation<sci_real>}) 5357 - common L{programming identifiers<identifier>} 5358 - network addresses (L{MAC<mac_address>}, L{IPv4<ipv4_address>}, L{IPv6<ipv6_address>}) 5359 - ISO8601 L{dates<iso8601_date>} and L{datetime<iso8601_datetime>} 5360 - L{UUID<uuid>} 5361 - L{comma-separated list<comma_separated_list>} 5362 Parse actions: 5363 - C{L{convertToInteger}} 5364 - C{L{convertToFloat}} 5365 - C{L{convertToDate}} 5366 - C{L{convertToDatetime}} 5367 - C{L{stripHTMLTags}} 5368 - C{L{upcaseTokens}} 5369 - C{L{downcaseTokens}} 5370 5371 Example:: 5372 pyparsing_common.number.runTests(''' 5373 # any int or real number, returned as the appropriate type 5374 100 5375 -100 5376 +100 5377 3.14159 5378 6.02e23 5379 1e-12 5380 ''') 5381 5382 pyparsing_common.fnumber.runTests(''' 5383 # any int or real number, returned as float 5384 100 5385 -100 5386 +100 5387 3.14159 5388 6.02e23 5389 1e-12 5390 ''') 5391 5392 pyparsing_common.hex_integer.runTests(''' 5393 # hex numbers 5394 100 5395 FF 5396 ''') 5397 5398 pyparsing_common.fraction.runTests(''' 5399 # fractions 5400 1/2 5401 -3/4 5402 ''') 5403 5404 pyparsing_common.mixed_integer.runTests(''' 5405 # mixed fractions 5406 1 5407 1/2 5408 -3/4 5409 1-3/4 5410 ''') 5411 5412 import uuid 5413 pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID)) 5414 pyparsing_common.uuid.runTests(''' 5415 # uuid 5416 12345678-1234-5678-1234-567812345678 5417 ''') 5418 prints:: 5419 # any int or real number, returned as the appropriate type 5420 100 5421 [100] 5422 5423 -100 5424 [-100] 5425 5426 +100 5427 [100] 5428 5429 3.14159 5430 [3.14159] 5431 5432 6.02e23 5433 [6.02e+23] 5434 5435 1e-12 5436 [1e-12] 5437 5438 # any int or real number, returned as float 5439 100 5440 [100.0] 5441 5442 -100 5443 [-100.0] 5444 5445 +100 5446 [100.0] 5447 5448 3.14159 5449 [3.14159] 5450 5451 6.02e23 5452 [6.02e+23] 5453 5454 1e-12 5455 [1e-12] 5456 5457 # hex numbers 5458 100 5459 [256] 5460 5461 FF 5462 [255] 5463 5464 # fractions 5465 1/2 5466 [0.5] 5467 5468 -3/4 5469 [-0.75] 5470 5471 # mixed fractions 5472 1 5473 [1] 5474 5475 1/2 5476 [0.5] 5477 5478 -3/4 5479 [-0.75] 5480 5481 1-3/4 5482 [1.75] 5483 5484 # uuid 5485 12345678-1234-5678-1234-567812345678 5486 [UUID('12345678-1234-5678-1234-567812345678')] 5487 """ 5488 5489 convertToInteger = tokenMap(int) 5490 """ 5491 Parse action for converting parsed integers to Python int 5492 """ 5493 5494 convertToFloat = tokenMap(float) 5495 """ 5496 Parse action for converting parsed numbers to Python float 5497 """ 5498 5499 integer = Word(nums).setName("integer").setParseAction(convertToInteger) 5500 """expression that parses an unsigned integer, returns an int""" 5501 5502 hex_integer = Word(hexnums).setName("hex integer").setParseAction(tokenMap(int,16)) 5503 """expression that parses a hexadecimal integer, returns an int""" 5504 5505 signed_integer = Regex(r'[+-]?\d+').setName("signed integer").setParseAction(convertToInteger) 5506 """expression that parses an integer with optional leading sign, returns an int""" 5507 5508 fraction = (signed_integer().setParseAction(convertToFloat) + '/' + signed_integer().setParseAction(convertToFloat)).setName("fraction") 5509 """fractional expression of an integer divided by an integer, returns a float""" 5510 fraction.addParseAction(lambda t: t[0]/t[-1]) 5511 5512 mixed_integer = (fraction | signed_integer + Optional(Optional('-').suppress() + fraction)).setName("fraction or mixed integer-fraction") 5513 """mixed integer of the form 'integer - fraction', with optional leading integer, returns float""" 5514 mixed_integer.addParseAction(sum) 5515 5516 real = Regex(r'[+-]?\d+\.\d*').setName("real number").setParseAction(convertToFloat) 5517 """expression that parses a floating point number and returns a float""" 5518 5519 sci_real = Regex(r'[+-]?\d+([eE][+-]?\d+|\.\d*([eE][+-]?\d+)?)').setName("real number with scientific notation").setParseAction(convertToFloat) 5520 """expression that parses a floating point number with optional scientific notation and returns a float""" 5521 5522 # streamlining this expression makes the docs nicer-looking 5523 number = (sci_real | real | signed_integer).streamline() 5524 """any numeric expression, returns the corresponding Python type""" 5525 5526 fnumber = Regex(r'[+-]?\d+\.?\d*([eE][+-]?\d+)?').setName("fnumber").setParseAction(convertToFloat) 5527 """any int or real number, returned as float""" 5528 5529 identifier = Word(alphas+'_', alphanums+'_').setName("identifier") 5530 """typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')""" 5531 5532 ipv4_address = Regex(r'(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})){3}').setName("IPv4 address") 5533 "IPv4 address (C{0.0.0.0 - 255.255.255.255})" 5534 5535 _ipv6_part = Regex(r'[0-9a-fA-F]{1,4}').setName("hex_integer") 5536 _full_ipv6_address = (_ipv6_part + (':' + _ipv6_part)*7).setName("full IPv6 address") 5537 _short_ipv6_address = (Optional(_ipv6_part + (':' + _ipv6_part)*(0,6)) + "::" + Optional(_ipv6_part + (':' + _ipv6_part)*(0,6))).setName("short IPv6 address") 5538 _short_ipv6_address.addCondition(lambda t: sum(1 for tt in t if pyparsing_common._ipv6_part.matches(tt)) < 8) 5539 _mixed_ipv6_address = ("::ffff:" + ipv4_address).setName("mixed IPv6 address") 5540 ipv6_address = Combine((_full_ipv6_address | _mixed_ipv6_address | _short_ipv6_address).setName("IPv6 address")).setName("IPv6 address") 5541 "IPv6 address (long, short, or mixed form)" 5542 5543 mac_address = Regex(r'[0-9a-fA-F]{2}([:.-])[0-9a-fA-F]{2}(?:\1[0-9a-fA-F]{2}){4}').setName("MAC address") 5544 "MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)" 5545 5546 @staticmethod
5547 - def convertToDate(fmt="%Y-%m-%d"):
5548 """ 5549 Helper to create a parse action for converting parsed date string to Python datetime.date 5550 5551 Params - 5552 - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%d"}) 5553 5554 Example:: 5555 date_expr = pyparsing_common.iso8601_date.copy() 5556 date_expr.setParseAction(pyparsing_common.convertToDate()) 5557 print(date_expr.parseString("1999-12-31")) 5558 prints:: 5559 [datetime.date(1999, 12, 31)] 5560 """ 5561 def cvt_fn(s,l,t): 5562 try: 5563 return datetime.strptime(t[0], fmt).date() 5564 except ValueError as ve: 5565 raise ParseException(s, l, str(ve))
5566 return cvt_fn
5567 5568 @staticmethod
5569 - def convertToDatetime(fmt="%Y-%m-%dT%H:%M:%S.%f"):
5570 """ 5571 Helper to create a parse action for converting parsed datetime string to Python datetime.datetime 5572 5573 Params - 5574 - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%dT%H:%M:%S.%f"}) 5575 5576 Example:: 5577 dt_expr = pyparsing_common.iso8601_datetime.copy() 5578 dt_expr.setParseAction(pyparsing_common.convertToDatetime()) 5579 print(dt_expr.parseString("1999-12-31T23:59:59.999")) 5580 prints:: 5581 [datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)] 5582 """ 5583 def cvt_fn(s,l,t): 5584 try: 5585 return datetime.strptime(t[0], fmt) 5586 except ValueError as ve: 5587 raise ParseException(s, l, str(ve))
5588 return cvt_fn 5589 5590 iso8601_date = Regex(r'(?P<year>\d{4})(?:-(?P<month>\d\d)(?:-(?P<day>\d\d))?)?').setName("ISO8601 date") 5591 "ISO8601 date (C{yyyy-mm-dd})" 5592 5593 iso8601_datetime = Regex(r'(?P<year>\d{4})-(?P<month>\d\d)-(?P<day>\d\d)[T ](?P<hour>\d\d):(?P<minute>\d\d)(:(?P<second>\d\d(\.\d*)?)?)?(?P<tz>Z|[+-]\d\d:?\d\d)?').setName("ISO8601 datetime") 5594 "ISO8601 datetime (C{yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)}) - trailing seconds, milliseconds, and timezone optional; accepts separating C{'T'} or C{' '}" 5595 5596 uuid = Regex(r'[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}').setName("UUID") 5597 "UUID (C{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx})" 5598 5599 _html_stripper = anyOpenTag.suppress() | anyCloseTag.suppress() 5600 @staticmethod
5601 - def stripHTMLTags(s, l, tokens):
5602 """ 5603 Parse action to remove HTML tags from web page HTML source 5604 5605 Example:: 5606 # strip HTML links from normal text 5607 text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>' 5608 td,td_end = makeHTMLTags("TD") 5609 table_text = td + SkipTo(td_end).setParseAction(pyparsing_common.stripHTMLTags)("body") + td_end 5610 5611 print(table_text.parseString(text).body) # -> 'More info at the pyparsing wiki page' 5612 """ 5613 return pyparsing_common._html_stripper.transformString(tokens[0])
5614 5615 _commasepitem = Combine(OneOrMore(~Literal(",") + ~LineEnd() + Word(printables, excludeChars=',') 5616 + Optional( White(" \t") ) ) ).streamline().setName("commaItem") 5617 comma_separated_list = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("comma separated list") 5618 """Predefined expression of 1 or more printable words or quoted strings, separated by commas.""" 5619 5620 upcaseTokens = staticmethod(tokenMap(lambda t: _ustr(t).upper())) 5621 """Parse action to convert tokens to upper case.""" 5622 5623 downcaseTokens = staticmethod(tokenMap(lambda t: _ustr(t).lower())) 5624 """Parse action to convert tokens to lower case.""" 5625 5626 5627 if __name__ == "__main__": 5628 5629 selectToken = CaselessLiteral("select") 5630 fromToken = CaselessLiteral("from") 5631 5632 ident = Word(alphas, alphanums + "_$") 5633 5634 columnName = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens) 5635 columnNameList = Group(delimitedList(columnName)).setName("columns") 5636 columnSpec = ('*' | columnNameList) 5637 5638 tableName = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens) 5639 tableNameList = Group(delimitedList(tableName)).setName("tables") 5640 5641 simpleSQL = selectToken("command") + columnSpec("columns") + fromToken + tableNameList("tables") 5642 5643 # demo runTests method, including embedded comments in test string 5644 simpleSQL.runTests(""" 5645 # '*' as column list and dotted table name 5646 select * from SYS.XYZZY 5647 5648 # caseless match on "SELECT", and casts back to "select" 5649 SELECT * from XYZZY, ABC 5650 5651 # list of column names, and mixed case SELECT keyword 5652 Select AA,BB,CC from Sys.dual 5653 5654 # multiple tables 5655 Select A, B, C from Sys.dual, Table2 5656 5657 # invalid SELECT keyword - should fail 5658 Xelect A, B, C from Sys.dual 5659 5660 # incomplete command - should fail 5661 Select 5662 5663 # invalid column name - should fail 5664 Select ^^^ frox Sys.dual 5665 5666 """) 5667 5668 pyparsing_common.number.runTests(""" 5669 100 5670 -100 5671 +100 5672 3.14159 5673 6.02e23 5674 1e-12 5675 """) 5676 5677 # any int or real number, returned as float 5678 pyparsing_common.fnumber.runTests(""" 5679 100 5680 -100 5681 +100 5682 3.14159 5683 6.02e23 5684 1e-12 5685 """) 5686 5687 pyparsing_common.hex_integer.runTests(""" 5688 100 5689 FF 5690 """) 5691 5692 import uuid 5693 pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID)) 5694 pyparsing_common.uuid.runTests(""" 5695 12345678-1234-5678-1234-567812345678 5696 """) 5697
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pyparsing
Module pyparsing :: Class And
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Class And

source code

   object --+        
            |        
ParserElement --+    
                |    
  ParseExpression --+
                    |
                   And

Requires all given ParseExpressions to be found in the given order. Expressions may be separated by whitespace. May be constructed using the '+' operator. May also be constructed using the '-' operator, which will suppress backtracking.

Example:

   integer = Word(nums)
   name_expr = OneOrMore(Word(alphas))

   expr = And([integer("id"),name_expr("name"),integer("age")])
   # more easily written as:
   expr = integer("id") + name_expr("name") + integer("age")
Instance Methods
 
__init__(self, exprs, savelist=True)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__iadd__(self, other) source code
 
checkRecursion(self, parseElementList) source code
 
__str__(self)
str(x)		 source code

Inherited from ParseExpression: __getitem__, append, copy, ignore, leaveWhitespace, setResultsName, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, exprs, savelist=True)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

checkRecursion(self, parseElementList)

source code 
Overrides: ParserElement.checkRecursion

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
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pyparsing-2.1.10/htmldoc/pyparsing.CaselessKeyword-class.html0000666000000000000000000004222412775575455022540 0ustar 00000000000000 pyparsing.CaselessKeyword
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pyparsing
Module pyparsing :: Class CaselessKeyword
[frames] | no frames]

Class CaselessKeyword

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
              Keyword --+
                        |
                       CaselessKeyword

Caseless version of Keyword.

Example:

   OneOrMore(CaselessKeyword("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD']

(Contrast with example for CaselessLiteral.)

Instance Methods
 
__init__(self, matchString, identChars=None)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from Keyword: copy

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from Keyword: setDefaultKeywordChars

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from Keyword: DEFAULT_KEYWORD_CHARS

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, matchString, identChars=None)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
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pyparsing
Module pyparsing :: Class CaselessLiteral
[frames] | no frames]

Class CaselessLiteral

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
              Literal --+
                        |
                       CaselessLiteral

Token to match a specified string, ignoring case of letters. Note: the matched results will always be in the case of the given match string, NOT the case of the input text.

Example:

   OneOrMore(CaselessLiteral("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD', 'CMD']

(Contrast with example for CaselessKeyword.)

Instance Methods
 
__init__(self, matchString)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from Literal: __slotnames__

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, matchString)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.CharsNotIn-class.html0000666000000000000000000004476712775575455021457 0ustar 00000000000000 pyparsing.CharsNotIn
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pyparsing
Module pyparsing :: Class CharsNotIn
[frames] | no frames]

Class CharsNotIn

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   CharsNotIn

Token for matching words composed of characters not in a given set (will include whitespace in matched characters if not listed in the provided exclusion set - see example). Defined with string containing all disallowed characters, and an optional minimum, maximum, and/or exact length. The default value for min is 1 (a minimum value < 1 is not valid); the default values for max and exact are 0, meaning no maximum or exact length restriction.

Example:

   # define a comma-separated-value as anything that is not a ','
   csv_value = CharsNotIn(',')
   print(delimitedList(csv_value).parseString("dkls,lsdkjf,s12 34,@!#,213"))

prints:

   ['dkls', 'lsdkjf', 's12 34', '@!#', '213']
Instance Methods
 
__init__(self, notChars, min=1, max=0, exact=0)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, notChars, min=1, max=0, exact=0)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing-2.1.10/htmldoc/pyparsing.CloseMatch-class.html0000666000000000000000000004333412775575455021456 0ustar 00000000000000 pyparsing.CloseMatch
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pyparsing
Module pyparsing :: Class CloseMatch
[frames] | no frames]

Class CloseMatch

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   CloseMatch

A variation on Literal which matches "close" matches, that is, strings with at most 'n' mismatching characters. CloseMatch takes parameters:

  • match_string - string to be matched
  • maxMismatches - (default=1) maximum number of mismatches allowed to count as a match

The results from a successful parse will contain the matched text from the input string and the following named results:

  • mismatches - a list of the positions within the match_string where mismatches were found
  • original - the original match_string used to compare against the input string

If mismatches is an empty list, then the match was an exact match.

Example:

   patt = CloseMatch("ATCATCGAATGGA")
   patt.parseString("ATCATCGAAXGGA") # -> (['ATCATCGAAXGGA'], {'mismatches': [[9]], 'original': ['ATCATCGAATGGA']})
   patt.parseString("ATCAXCGAAXGGA") # -> Exception: Expected 'ATCATCGAATGGA' (with up to 1 mismatches) (at char 0), (line:1, col:1)

   # exact match
   patt.parseString("ATCATCGAATGGA") # -> (['ATCATCGAATGGA'], {'mismatches': [[]], 'original': ['ATCATCGAATGGA']})

   # close match allowing up to 2 mismatches
   patt = CloseMatch("ATCATCGAATGGA", maxMismatches=2)
   patt.parseString("ATCAXCGAAXGGA") # -> (['ATCAXCGAAXGGA'], {'mismatches': [[4, 9]], 'original': ['ATCATCGAATGGA']})
Instance Methods
 
__init__(self, match_string, maxMismatches=1)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, match_string, maxMismatches=1)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Module pyparsing :: Class Combine
[frames] | no frames]

Class Combine

source code

     object --+            
              |            
  ParserElement --+        
                  |        
ParseElementEnhance --+    
                      |    
         TokenConverter --+
                          |
                         Combine

Converter to concatenate all matching tokens to a single string. By default, the matching patterns must also be contiguous in the input string; this can be disabled by specifying 'adjacent=False' in the constructor.

Example:

   real = Word(nums) + '.' + Word(nums)
   print(real.parseString('3.1416')) # -> ['3', '.', '1416']
   # will also erroneously match the following
   print(real.parseString('3. 1416')) # -> ['3', '.', '1416']

   real = Combine(Word(nums) + '.' + Word(nums))
   print(real.parseString('3.1416')) # -> ['3.1416']
   # no match when there are internal spaces
   print(real.parseString('3. 1416')) # -> Exception: Expected W:(0123...)
Instance Methods
 
__init__(self, expr, joinString='', adjacent=True)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
ignore(self, other)
Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.		 source code
 
postParse(self, instring, loc, tokenlist) source code

Inherited from ParseElementEnhance: __str__, checkRecursion, leaveWhitespace, parseImpl, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr, joinString='', adjacent=True)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

ignore(self, other)

source code 

Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.

Example:

   patt = OneOrMore(Word(alphas))
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj']
   
   patt.ignore(cStyleComment)
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd']
Overrides: ParserElement.ignore
(inherited documentation)

postParse(self, instring, loc, tokenlist)

source code 
Overrides: ParserElement.postParse

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pyparsing
Module pyparsing :: Class Dict
[frames] | no frames]

Class Dict

source code

     object --+            
              |            
  ParserElement --+        
                  |        
ParseElementEnhance --+    
                      |    
         TokenConverter --+
                          |
                         Dict

Converter to return a repetitive expression as a list, but also as a dictionary. Each element can also be referenced using the first token in the expression as its key. Useful for tabular report scraping when the first column can be used as a item key.

Example:

   data_word = Word(alphas)
   label = data_word + FollowedBy(':')
   attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join))

   text = "shape: SQUARE posn: upper left color: light blue texture: burlap"
   attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
   
   # print attributes as plain groups
   print(OneOrMore(attr_expr).parseString(text).dump())
   
   # instead of OneOrMore(expr), parse using Dict(OneOrMore(Group(expr))) - Dict will auto-assign names
   result = Dict(OneOrMore(Group(attr_expr))).parseString(text)
   print(result.dump())
   
   # access named fields as dict entries, or output as dict
   print(result['shape'])        
   print(result.asDict())

prints:

   ['shape', 'SQUARE', 'posn', 'upper left', 'color', 'light blue', 'texture', 'burlap']

   [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']]
   - color: light blue
   - posn: upper left
   - shape: SQUARE
   - texture: burlap
   SQUARE
   {'color': 'light blue', 'posn': 'upper left', 'texture': 'burlap', 'shape': 'SQUARE'}

See more examples at ParseResults of accessing fields by results name.

Instance Methods
 
__init__(self, expr)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
postParse(self, instring, loc, tokenlist) source code

Inherited from ParseElementEnhance: __str__, checkRecursion, ignore, leaveWhitespace, parseImpl, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

postParse(self, instring, loc, tokenlist)

source code 
Overrides: ParserElement.postParse

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Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
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pyparsing
Module pyparsing :: Class Each
[frames] | no frames]

Class Each

source code

   object --+        
            |        
ParserElement --+    
                |    
  ParseExpression --+
                    |
                   Each

Requires all given ParseExpressions to be found, but in any order. Expressions may be separated by whitespace. May be constructed using the '&' operator.

Example:

   color = oneOf("RED ORANGE YELLOW GREEN BLUE PURPLE BLACK WHITE BROWN")
   shape_type = oneOf("SQUARE CIRCLE TRIANGLE STAR HEXAGON OCTAGON")
   integer = Word(nums)
   shape_attr = "shape:" + shape_type("shape")
   posn_attr = "posn:" + Group(integer("x") + ',' + integer("y"))("posn")
   color_attr = "color:" + color("color")
   size_attr = "size:" + integer("size")

   # use Each (using operator '&') to accept attributes in any order 
   # (shape and posn are required, color and size are optional)
   shape_spec = shape_attr & posn_attr & Optional(color_attr) & Optional(size_attr)

   shape_spec.runTests('''
       shape: SQUARE color: BLACK posn: 100, 120
       shape: CIRCLE size: 50 color: BLUE posn: 50,80
       color:GREEN size:20 shape:TRIANGLE posn:20,40
       '''
       )

prints:

   shape: SQUARE color: BLACK posn: 100, 120
   ['shape:', 'SQUARE', 'color:', 'BLACK', 'posn:', ['100', ',', '120']]
   - color: BLACK
   - posn: ['100', ',', '120']
     - x: 100
     - y: 120
   - shape: SQUARE


   shape: CIRCLE size: 50 color: BLUE posn: 50,80
   ['shape:', 'CIRCLE', 'size:', '50', 'color:', 'BLUE', 'posn:', ['50', ',', '80']]
   - color: BLUE
   - posn: ['50', ',', '80']
     - x: 50
     - y: 80
   - shape: CIRCLE
   - size: 50


   color: GREEN size: 20 shape: TRIANGLE posn: 20,40
   ['color:', 'GREEN', 'size:', '20', 'shape:', 'TRIANGLE', 'posn:', ['20', ',', '40']]
   - color: GREEN
   - posn: ['20', ',', '40']
     - x: 20
     - y: 40
   - shape: TRIANGLE
   - size: 20
Instance Methods
 
__init__(self, exprs, savelist=True)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code
 
checkRecursion(self, parseElementList) source code

Inherited from ParseExpression: __getitem__, append, copy, ignore, leaveWhitespace, setResultsName, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, exprs, savelist=True)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

checkRecursion(self, parseElementList)

source code 
Overrides: ParserElement.checkRecursion

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pyparsing
Module pyparsing :: Class Empty
[frames] | no frames]

Class Empty

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   Empty
Known Subclasses:
  • And._ErrorStop

An empty token, will always match.

Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseImpl, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

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pyparsing-2.1.10/htmldoc/pyparsing.FollowedBy-class.html0000666000000000000000000004151612775575455021502 0ustar 00000000000000 pyparsing.FollowedBy
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pyparsing
Module pyparsing :: Class FollowedBy
[frames] | no frames]

Class FollowedBy

source code

     object --+        
              |        
  ParserElement --+    
                  |    
ParseElementEnhance --+
                      |
                     FollowedBy

Lookahead matching of the given parse expression. FollowedBy does not advance the parsing position within the input string, it only verifies that the specified parse expression matches at the current position. FollowedBy always returns a null token list.

Example:

   # use FollowedBy to match a label only if it is followed by a ':'
   data_word = Word(alphas)
   label = data_word + FollowedBy(':')
   attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
   
   OneOrMore(attr_expr).parseString("shape: SQUARE color: BLACK posn: upper left").pprint()

prints:

   [['shape', 'SQUARE'], ['color', 'BLACK'], ['posn', 'upper left']]
Instance Methods
 
__init__(self, expr)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParseElementEnhance: __str__, checkRecursion, ignore, leaveWhitespace, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing-2.1.10/htmldoc/pyparsing.Forward-class.html0000666000000000000000000006254012775575455021040 0ustar 00000000000000 pyparsing.Forward
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pyparsing
Module pyparsing :: Class Forward
[frames] | no frames]

Class Forward

source code

     object --+        
              |        
  ParserElement --+    
                  |    
ParseElementEnhance --+
                      |
                     Forward
Known Subclasses:
  • _ForwardNoRecurse

Forward declaration of an expression to be defined later - used for recursive grammars, such as algebraic infix notation. When the expression is known, it is assigned to the Forward variable using the '<<' operator.

Note: take care when assigning to Forward not to overlook precedence of operators. Specifically, '|' has a lower precedence than '<<', so that:

   fwdExpr << a | b | c

will actually be evaluated as:

   (fwdExpr << a) | b | c

thereby leaving b and c out as parseable alternatives. It is recommended that you explicitly group the values inserted into the Forward:

   fwdExpr << (a | b | c)

Converting to use the '<<=' operator instead will avoid this problem.

See ParseResults.pprint for an example of a recursive parser created using Forward.

Instance Methods
 
__init__(self, other=None)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
__lshift__(self, other) source code
 
__ilshift__(self, other) source code
 
leaveWhitespace(self)
Disables the skipping of whitespace before matching the characters in the ParserElement's defined pattern.		 source code
 
streamline(self) source code
 
validate(self, validateTrace=[])
Check defined expressions for valid structure, check for infinite recursive definitions.		 source code
 
__str__(self)
str(x)		 source code
 
copy(self)
Make a copy of this ParserElement.		 source code

Inherited from ParseElementEnhance: checkRecursion, ignore, parseImpl

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, other=None)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

leaveWhitespace(self)

source code 

Disables the skipping of whitespace before matching the characters in the ParserElement's defined pattern. This is normally only used internally by the pyparsing module, but may be needed in some whitespace-sensitive grammars.

Overrides: ParserElement.leaveWhitespace
(inherited documentation)

streamline(self)

source code 
Overrides: ParserElement.streamline

validate(self, validateTrace=[])

source code 

Check defined expressions for valid structure, check for infinite recursive definitions.

Overrides: ParserElement.validate
(inherited documentation)

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

copy(self)

source code 

Make a copy of this ParserElement. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element.

Example:

   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K")
   integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
   
   print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))

prints:

   [5120, 100, 655360, 268435456]

Equivalent form of expr.copy() is just expr():

   integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
Overrides: ParserElement.copy
(inherited documentation)

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pyparsing
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pyparsing-2.1.10/htmldoc/pyparsing.GoToColumn-class.html0000666000000000000000000004265512775575455021467 0ustar 00000000000000 pyparsing.GoToColumn
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pyparsing
Module pyparsing :: Class GoToColumn
[frames] | no frames]

Class GoToColumn

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       GoToColumn

Token to advance to a specific column of input text; useful for tabular report scraping.

Instance Methods
 
__init__(self, colno)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
preParse(self, instring, loc) source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, colno)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

preParse(self, instring, loc)

source code 
Overrides: ParserElement.preParse

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Module pyparsing :: Class Group
[frames] | no frames]

Class Group

source code

     object --+            
              |            
  ParserElement --+        
                  |        
ParseElementEnhance --+    
                      |    
         TokenConverter --+
                          |
                         Group

Converter to return the matched tokens as a list - useful for returning tokens of ZeroOrMore and OneOrMore expressions.

Example:

   ident = Word(alphas)
   num = Word(nums)
   term = ident | num
   func = ident + Optional(delimitedList(term))
   print(func.parseString("fn a,b,100"))  # -> ['fn', 'a', 'b', '100']

   func = ident + Group(Optional(delimitedList(term)))
   print(func.parseString("fn a,b,100"))  # -> ['fn', ['a', 'b', '100']]
Instance Methods
 
__init__(self, expr)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
postParse(self, instring, loc, tokenlist) source code

Inherited from ParseElementEnhance: __str__, checkRecursion, ignore, leaveWhitespace, parseImpl, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

postParse(self, instring, loc, tokenlist)

source code 
Overrides: ParserElement.postParse

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pyparsing-2.1.10/htmldoc/pyparsing.Keyword-class.html0000666000000000000000000005403212775575455021055 0ustar 00000000000000 pyparsing.Keyword
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pyparsing
Module pyparsing :: Class Keyword
[frames] | no frames]

Class Keyword

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   Keyword
Known Subclasses:

Token to exactly match a specified string as a keyword, that is, it must be immediately followed by a non-keyword character. Compare with Literal:

  • Literal("if") will match the leading 'if' in 'ifAndOnlyIf'.
  • Keyword("if") will not; it will only match the leading 'if' in 'if x=1', or 'if(y==2)'

Accepts two optional constructor arguments in addition to the keyword string:

  • identChars is a string of characters that would be valid identifier characters, defaulting to all alphanumerics + "_" and "$"
  • caseless allows case-insensitive matching, default is False.

Example:

   Keyword("start").parseString("start")  # -> ['start']
   Keyword("start").parseString("starting")  # -> Exception

For case-insensitive matching, use CaselessKeyword.

Instance Methods
 
__init__(self, matchString, identChars=None, caseless=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
copy(self)
Make a copy of this ParserElement.		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods
 
setDefaultKeywordChars(chars)
Overrides the default Keyword chars		 source code

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  DEFAULT_KEYWORD_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijk...

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, matchString, identChars=None, caseless=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

copy(self)

source code 

Make a copy of this ParserElement. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element.

Example:

   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K")
   integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
   
   print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))

prints:

   [5120, 100, 655360, 268435456]

Equivalent form of expr.copy() is just expr():

   integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
Overrides: ParserElement.copy
(inherited documentation)

Class Variable Details

DEFAULT_KEYWORD_CHARS

Value:
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_$'

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pyparsing-2.1.10/htmldoc/pyparsing.LineEnd-class.html0000666000000000000000000004026512775575455020752 0ustar 00000000000000 pyparsing.LineEnd
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pyparsing
Module pyparsing :: Class LineEnd
[frames] | no frames]

Class LineEnd

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       LineEnd

Matches if current position is at the end of a line within the parse string

Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.LineStart-class.html0000666000000000000000000004035112775575455021335 0ustar 00000000000000 pyparsing.LineStart
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pyparsing
Module pyparsing :: Class LineStart
[frames] | no frames]

Class LineStart

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       LineStart

Matches if current position is at the beginning of a line within the parse string

Example:

   test = '''        AAA this line
   AAA and this line
     AAA but not this one
   B AAA and definitely not this one
   '''

   for t in (LineStart() + 'AAA' + restOfLine).searchString(test):
       print(t)

Prints:

   ['AAA', ' this line']
   ['AAA', ' and this line']
Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.Literal-class.html0000666000000000000000000004171712775575455021033 0ustar 00000000000000 pyparsing.Literal
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pyparsing
Module pyparsing :: Class Literal
[frames] | no frames]

Class Literal

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   Literal
Known Subclasses:

Token to exactly match a specified string.

Example:

   Literal('blah').parseString('blah')  # -> ['blah']
   Literal('blah').parseString('blahfooblah')  # -> ['blah']
   Literal('blah').parseString('bla')  # -> Exception: Expected "blah"

For case-insensitive matching, use CaselessLiteral.

For keyword matching (force word break before and after the matched string), use Keyword or CaselessKeyword.

Instance Methods
 
__init__(self, matchString)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, matchString)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing-2.1.10/htmldoc/pyparsing.MatchFirst-class.html0000666000000000000000000005147112775575455021501 0ustar 00000000000000 pyparsing.MatchFirst
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pyparsing
Module pyparsing :: Class MatchFirst
[frames] | no frames]

Class MatchFirst

source code

   object --+        
            |        
ParserElement --+    
                |    
  ParseExpression --+
                    |
                   MatchFirst

Requires that at least one ParseExpression is found. If two expressions match, the first one listed is the one that will match. May be constructed using the '|' operator.

Example:

   # construct MatchFirst using '|' operator
   
   # watch the order of expressions to match
   number = Word(nums) | Combine(Word(nums) + '.' + Word(nums))
   print(number.searchString("123 3.1416 789")) #  Fail! -> [['123'], ['3'], ['1416'], ['789']]

   # put more selective expression first
   number = Combine(Word(nums) + '.' + Word(nums)) | Word(nums)
   print(number.searchString("123 3.1416 789")) #  Better -> [['123'], ['3.1416'], ['789']]
Instance Methods
 
__init__(self, exprs, savelist=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__ior__(self, other) source code
 
__str__(self)
str(x)		 source code
 
checkRecursion(self, parseElementList) source code

Inherited from ParseExpression: __getitem__, append, copy, ignore, leaveWhitespace, setResultsName, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, exprs, savelist=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

checkRecursion(self, parseElementList)

source code 
Overrides: ParserElement.checkRecursion

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pyparsing
Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.NoMatch-class.html0000666000000000000000000003733012775575455020764 0ustar 00000000000000 pyparsing.NoMatch
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pyparsing
Module pyparsing :: Class NoMatch
[frames] | no frames]

Class NoMatch

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   NoMatch

A token that will never match.

Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.NotAny-class.html0000666000000000000000000004420712775575455020644 0ustar 00000000000000 pyparsing.NotAny
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pyparsing
Module pyparsing :: Class NotAny
[frames] | no frames]

Class NotAny

source code

     object --+        
              |        
  ParserElement --+    
                  |    
ParseElementEnhance --+
                      |
                     NotAny

Lookahead to disallow matching with the given parse expression. NotAny does not advance the parsing position within the input string, it only verifies that the specified parse expression does not match at the current position. Also, NotAny does not skip over leading whitespace. NotAny always returns a null token list. May be constructed using the '~' operator.

Example:
Instance Methods
 
__init__(self, expr)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParseElementEnhance: checkRecursion, ignore, leaveWhitespace, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:29 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.OneOrMore-class.html0000666000000000000000000003740612775575455021304 0ustar 00000000000000 pyparsing.OneOrMore
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pyparsing
Module pyparsing :: Class OneOrMore
[frames] | no frames]

Class OneOrMore

source code

     object --+            
              |            
  ParserElement --+        
                  |        
ParseElementEnhance --+    
                      |    
         _MultipleMatch --+
                          |
                         OneOrMore

Repetition of one or more of the given expression.

Parameters:

  • expr - expression that must match one or more times
  • stopOn - (default=None) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression)

Example:

   data_word = Word(alphas)
   label = data_word + FollowedBy(':')
   attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join))

   text = "shape: SQUARE posn: upper left color: BLACK"
   OneOrMore(attr_expr).parseString(text).pprint()  # Fail! read 'color' as data instead of next label -> [['shape', 'SQUARE color']]

   # use stopOn attribute for OneOrMore to avoid reading label string as part of the data
   attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
   OneOrMore(attr_expr).parseString(text).pprint() # Better -> [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'BLACK']]
   
   # could also be written as
   (attr_expr * (1,)).parseString(text).pprint()
Instance Methods
 
__str__(self)
str(x)		 source code

Inherited from _MultipleMatch: __init__, parseImpl

Inherited from ParseElementEnhance: checkRecursion, ignore, leaveWhitespace, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Module pyparsing :: Class OnlyOnce
[frames] | no frames]

Class OnlyOnce

source code

object --+
         |
        OnlyOnce

Wrapper for parse actions, to ensure they are only called once.

Instance Methods
 
__init__(self, methodCall)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
__call__(self, s, l, t) source code
 
reset(self) source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties

Inherited from object: __class__

Method Details

__init__(self, methodCall)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

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pyparsing-2.1.10/htmldoc/pyparsing.Optional-class.html0000666000000000000000000004535512775575456021227 0ustar 00000000000000 pyparsing.Optional
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pyparsing
Module pyparsing :: Class Optional
[frames] | no frames]

Class Optional

source code

     object --+        
              |        
  ParserElement --+    
                  |    
ParseElementEnhance --+
                      |
                     Optional

Optional matching of the given expression.

Parameters:

  • expr - expression that must match zero or more times
  • default (optional) - value to be returned if the optional expression is not found.

Example:

   # US postal code can be a 5-digit zip, plus optional 4-digit qualifier
   zip = Combine(Word(nums, exact=5) + Optional('-' + Word(nums, exact=4)))
   zip.runTests('''
       # traditional ZIP code
       12345
       
       # ZIP+4 form
       12101-0001
       
       # invalid ZIP
       98765-
       ''')

prints:

   # traditional ZIP code
   12345
   ['12345']

   # ZIP+4 form
   12101-0001
   ['12101-0001']

   # invalid ZIP
   98765-
        ^
   FAIL: Expected end of text (at char 5), (line:1, col:6)
Instance Methods
 
__init__(self, expr, default=_NullToken())
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParseElementEnhance: checkRecursion, ignore, leaveWhitespace, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr, default=_NullToken())
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Generated by Epydoc 3.0.1 on Thu Oct 06 20:32:30 2016 http://epydoc.sourceforge.net
pyparsing-2.1.10/htmldoc/pyparsing.Or-class.html0000666000000000000000000005015512775575456020014 0ustar 00000000000000 pyparsing.Or
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pyparsing
Module pyparsing :: Class Or
[frames] | no frames]

Class Or

source code

   object --+        
            |        
ParserElement --+    
                |    
  ParseExpression --+
                    |
                   Or

Requires that at least one ParseExpression is found. If two expressions match, the expression that matches the longest string will be used. May be constructed using the '^' operator.

Example:

   # construct Or using '^' operator
   
   number = Word(nums) ^ Combine(Word(nums) + '.' + Word(nums))
   print(number.searchString("123 3.1416 789"))

prints:

   [['123'], ['3.1416'], ['789']]
Instance Methods
 
__init__(self, exprs, savelist=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__ixor__(self, other) source code
 
__str__(self)
str(x)		 source code
 
checkRecursion(self, parseElementList) source code

Inherited from ParseExpression: __getitem__, append, copy, ignore, leaveWhitespace, setResultsName, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, exprs, savelist=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

checkRecursion(self, parseElementList)

source code 
Overrides: ParserElement.checkRecursion

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Module pyparsing :: Class ParseBaseException
[frames] | no frames]

Class ParseBaseException

source code

              object --+        
                       |        
exceptions.BaseException --+    
                           |    
        exceptions.Exception --+
                               |
                              ParseBaseException
Known Subclasses:

base exception class for all parsing runtime exceptions

Instance Methods
 
__init__(self, pstr, loc=0, msg=None, elem=None)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
__getattr__(self, aname)
supported attributes by name are:		 source code
 
__str__(self)
str(x)		 source code
 
__repr__(self)
repr(x)		 source code
 
markInputline(self, markerString='>!<')
Extracts the exception line from the input string, and marks the location of the exception with a special symbol.		 source code
 
__dir__(self) source code

Inherited from exceptions.Exception: __new__

Inherited from exceptions.BaseException: __delattr__, __getattribute__, __getitem__, __getslice__, __reduce__, __setattr__, __setstate__, __unicode__

Inherited from object: __format__, __hash__, __reduce_ex__, __sizeof__, __subclasshook__

Properties

Inherited from exceptions.BaseException: args, message

Inherited from object: __class__

Method Details

__init__(self, pstr, loc=0, msg=None, elem=None)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

__getattr__(self, aname)
(Qualification operator)

source code 

supported attributes by name are:

  • lineno - returns the line number of the exception text
  • col - returns the column number of the exception text
  • line - returns the line containing the exception text

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

__repr__(self)
(Representation operator)

source code 

repr(x)

Overrides: object.__repr__
(inherited documentation)

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Module pyparsing :: Class ParseElementEnhance
[frames] | no frames]

Class ParseElementEnhance

source code

   object --+    
            |    
ParserElement --+
                |
               ParseElementEnhance
Known Subclasses:

Abstract subclass of ParserElement, for combining and post-processing parsed tokens.

Instance Methods
 
__init__(self, expr, savelist=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
leaveWhitespace(self)
Disables the skipping of whitespace before matching the characters in the ParserElement's defined pattern.		 source code
 
ignore(self, other)
Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.		 source code
 
streamline(self) source code
 
checkRecursion(self, parseElementList) source code
 
validate(self, validateTrace=[])
Check defined expressions for valid structure, check for infinite recursive definitions.		 source code
 
__str__(self)
str(x)		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr, savelist=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

leaveWhitespace(self)

source code 

Disables the skipping of whitespace before matching the characters in the ParserElement's defined pattern. This is normally only used internally by the pyparsing module, but may be needed in some whitespace-sensitive grammars.

Overrides: ParserElement.leaveWhitespace
(inherited documentation)

ignore(self, other)

source code 

Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.

Example:

   patt = OneOrMore(Word(alphas))
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj']
   
   patt.ignore(cStyleComment)
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd']
Overrides: ParserElement.ignore
(inherited documentation)

streamline(self)

source code 
Overrides: ParserElement.streamline

checkRecursion(self, parseElementList)

source code 
Overrides: ParserElement.checkRecursion

validate(self, validateTrace=[])

source code 

Check defined expressions for valid structure, check for infinite recursive definitions.

Overrides: ParserElement.validate
(inherited documentation)

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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Module pyparsing :: Class ParseException
[frames] | no frames]

Class ParseException

source code

              object --+            
                       |            
exceptions.BaseException --+        
                           |        
        exceptions.Exception --+    
                               |    
              ParseBaseException --+
                                   |
                                  ParseException

Exception thrown when parse expressions don't match class; supported attributes by name are:

  • lineno - returns the line number of the exception text
  • col - returns the column number of the exception text
  • line - returns the line containing the exception text

Example:

   try:
       Word(nums).setName("integer").parseString("ABC")
   except ParseException as pe:
       print(pe)
       print("column: {}".format(pe.col))

prints:

  Expected integer (at char 0), (line:1, col:1)
   column: 1
Instance Methods

Inherited from ParseBaseException: __dir__, __getattr__, __init__, __repr__, __str__, markInputline

Inherited from exceptions.Exception: __new__

Inherited from exceptions.BaseException: __delattr__, __getattribute__, __getitem__, __getslice__, __reduce__, __setattr__, __setstate__, __unicode__

Inherited from object: __format__, __hash__, __reduce_ex__, __sizeof__, __subclasshook__

Properties

Inherited from exceptions.BaseException: args, message

Inherited from object: __class__

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pyparsing
Module pyparsing :: Class ParseExpression
[frames] | no frames]

Class ParseExpression

source code

   object --+    
            |    
ParserElement --+
                |
               ParseExpression
Known Subclasses:

Abstract subclass of ParserElement, for combining and post-processing parsed tokens.

Instance Methods
 
__init__(self, exprs, savelist=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
__getitem__(self, i) source code
 
append(self, other) source code
 
leaveWhitespace(self)
Extends leaveWhitespace defined in base class, and also invokes leaveWhitespace on all contained expressions.		 source code
 
ignore(self, other)
Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.		 source code
 
__str__(self)
str(x)		 source code
 
streamline(self) source code
 
setResultsName(self, name, listAllMatches=False)
Define name for referencing matching tokens as a nested attribute of the returned parse results.		 source code
 
validate(self, validateTrace=[])
Check defined expressions for valid structure, check for infinite recursive definitions.		 source code
 
copy(self)
Make a copy of this ParserElement.		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, matches, parseFile, parseImpl, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, exprs, savelist=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

leaveWhitespace(self)

source code 

Extends leaveWhitespace defined in base class, and also invokes leaveWhitespace on all contained expressions.

Overrides: ParserElement.leaveWhitespace

ignore(self, other)

source code 

Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.

Example:

   patt = OneOrMore(Word(alphas))
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj']
   
   patt.ignore(cStyleComment)
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd']
Overrides: ParserElement.ignore
(inherited documentation)

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

streamline(self)

source code 
Overrides: ParserElement.streamline

setResultsName(self, name, listAllMatches=False)

source code 

Define name for referencing matching tokens as a nested attribute of the returned parse results. NOTE: this returns a *copy* of the original ParserElement object; this is so that the client can define a basic element, such as an integer, and reference it in multiple places with different names.

You can also set results names using the abbreviated syntax, expr("name") in place of expr.setResultsName("name") - see __call__.

Example:

   date_str = (integer.setResultsName("year") + '/' 
               + integer.setResultsName("month") + '/' 
               + integer.setResultsName("day"))

   # equivalent form:
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
Overrides: ParserElement.setResultsName
(inherited documentation)

validate(self, validateTrace=[])

source code 

Check defined expressions for valid structure, check for infinite recursive definitions.

Overrides: ParserElement.validate
(inherited documentation)

copy(self)

source code 

Make a copy of this ParserElement. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element.

Example:

   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K")
   integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
   
   print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))

prints:

   [5120, 100, 655360, 268435456]

Equivalent form of expr.copy() is just expr():

   integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
Overrides: ParserElement.copy
(inherited documentation)

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Module pyparsing :: Class ParseFatalException
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Class ParseFatalException

source code

              object --+            
                       |            
exceptions.BaseException --+        
                           |        
        exceptions.Exception --+    
                               |    
              ParseBaseException --+
                                   |
                                  ParseFatalException
Known Subclasses:

user-throwable exception thrown when inconsistent parse content is found; stops all parsing immediately

Instance Methods

Inherited from ParseBaseException: __dir__, __getattr__, __init__, __repr__, __str__, markInputline

Inherited from exceptions.Exception: __new__

Inherited from exceptions.BaseException: __delattr__, __getattribute__, __getitem__, __getslice__, __reduce__, __setattr__, __setstate__, __unicode__

Inherited from object: __format__, __hash__, __reduce_ex__, __sizeof__, __subclasshook__

Properties

Inherited from exceptions.BaseException: args, message

Inherited from object: __class__

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Module pyparsing :: Class ParserElement
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Class ParserElement

source code

object --+
         |
        ParserElement
Known Subclasses:

Abstract base level parser element class.

Instance Methods
 
__init__(self, savelist=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
copy(self)
Make a copy of this ParserElement.		 source code
 
setName(self, name)
Define name for this expression, makes debugging and exception messages clearer.		 source code
 
setResultsName(self, name, listAllMatches=False)
Define name for referencing matching tokens as a nested attribute of the returned parse results.		 source code
 
setBreak(self, breakFlag=True)
Method to invoke the Python pdb debugger when this element is about to be parsed.		 source code
 
setParseAction(self, *fns, **kwargs)
Define action to perform when successfully matching parse element definition.		 source code
 
addParseAction(self, *fns, **kwargs)
Add parse action to expression's list of parse actions.		 source code
 
addCondition(self, *fns, **kwargs)
Add a boolean predicate function to expression's list of parse actions.		 source code
 
setFailAction(self, fn)
Define action to perform if parsing fails at this expression.		 source code
 
preParse(self, instring, loc) source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
postParse(self, instring, loc, tokenlist) source code
 
tryParse(self, instring, loc) source code
 
canParseNext(self, instring, loc) source code
 
parseString(self, instring, parseAll=False)
Execute the parse expression with the given string.		 source code
 
scanString(self, instring, maxMatches=2147483647, overlap=False)
Scan the input string for expression matches.		 source code
 
transformString(self, instring)
Extension to scanString, to modify matching text with modified tokens that may be returned from a parse action.		 source code
 
searchString(self, instring, maxMatches=2147483647)
Another extension to scanString, simplifying the access to the tokens found to match the given parse expression.		 source code
 
split(self, instring, maxsplit=2147483647, includeSeparators=False)
Generator method to split a string using the given expression as a separator.		 source code
 
__add__(self, other)
Implementation of + operator - returns And.		 source code
 
__radd__(self, other)
Implementation of + operator when left operand is not a ParserElement		 source code
 
__sub__(self, other)
Implementation of - operator, returns And with error stop		 source code
 
__rsub__(self, other)
Implementation of - operator when left operand is not a ParserElement		 source code
 
__mul__(self, other)
Implementation of * operator, allows use of expr * 3 in place of expr + expr + expr.		 source code
 
__rmul__(self, other) source code
 
__or__(self, other)
Implementation of | operator - returns MatchFirst		 source code
 
__ror__(self, other)
Implementation of | operator when left operand is not a ParserElement		 source code
 
__xor__(self, other)
Implementation of ^ operator - returns Or		 source code
 
__rxor__(self, other)
Implementation of ^ operator when left operand is not a ParserElement		 source code
 
__and__(self, other)
Implementation of & operator - returns Each		 source code
 
__rand__(self, other)
Implementation of & operator when left operand is not a ParserElement		 source code
 
__invert__(self)
Implementation of ~ operator - returns NotAny		 source code
 
__call__(self, name=None)
Shortcut for setResultsName, with listAllMatches=False.		 source code
 
suppress(self)
Suppresses the output of this ParserElement; useful to keep punctuation from cluttering up returned output.		 source code
 
leaveWhitespace(self)
Disables the skipping of whitespace before matching the characters in the ParserElement's defined pattern.		 source code
 
setWhitespaceChars(self, chars)
Overrides the default whitespace chars		 source code
 
parseWithTabs(self)
Overrides default behavior to expand <TAB>s to spaces before parsing the input string.		 source code
 
ignore(self, other)
Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.		 source code
 
setDebugActions(self, startAction, successAction, exceptionAction)
Enable display of debugging messages while doing pattern matching.		 source code
 
setDebug(self, flag=True)
Enable display of debugging messages while doing pattern matching.		 source code
 
__str__(self)
str(x)		 source code
 
__repr__(self)
repr(x)		 source code
 
streamline(self) source code
 
checkRecursion(self, parseElementList) source code
 
validate(self, validateTrace=[])
Check defined expressions for valid structure, check for infinite recursive definitions.		 source code
 
parseFile(self, file_or_filename, parseAll=False)
Execute the parse expression on the given file or filename.		 source code
 
__eq__(self, other) source code
 
__ne__(self, other) source code
 
__hash__(self)
hash(x)		 source code
 
__req__(self, other) source code
 
__rne__(self, other) source code
 
matches(self, testString, parseAll=True)
Method for quick testing of a parser against a test string.		 source code
 
runTests(self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False)
Execute the parse expression on a series of test strings, showing each test, the parsed results or where the parse failed.		 source code

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods
 
setDefaultWhitespaceChars(chars)
Overrides the default whitespace chars		 source code
 
inlineLiteralsUsing(cls)
Set class to be used for inclusion of string literals into a parser.		 source code
 
resetCache() source code
 
enablePackrat(cache_size_limit=128)
Enables "packrat" parsing, which adds memoizing to the parsing logic.		 source code
Class Variables
  DEFAULT_WHITE_CHARS = ' \n\t\r'
  verbose_stacktrace = False
  packrat_cache = {}
  packrat_cache_lock = <_RLock owner=None count=0>
  packrat_cache_stats = [0, 0]
Properties

Inherited from object: __class__

Method Details

setDefaultWhitespaceChars(chars)
Static Method

source code 

Overrides the default whitespace chars

Example:

   # default whitespace chars are space, <TAB> and newline
   OneOrMore(Word(alphas)).parseString("abc def\nghi jkl")  # -> ['abc', 'def', 'ghi', 'jkl']
   
   # change to just treat newline as significant
   ParserElement.setDefaultWhitespaceChars(" \t")
   OneOrMore(Word(alphas)).parseString("abc def\nghi jkl")  # -> ['abc', 'def']

inlineLiteralsUsing(cls)
Static Method

source code 

Set class to be used for inclusion of string literals into a parser.

Example:

   # default literal class used is Literal
   integer = Word(nums)
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")           

   date_str.parseString("1999/12/31")  # -> ['1999', '/', '12', '/', '31']


   # change to Suppress
   ParserElement.inlineLiteralsUsing(Suppress)
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")           

   date_str.parseString("1999/12/31")  # -> ['1999', '12', '31']

__init__(self, savelist=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

copy(self)

source code 

Make a copy of this ParserElement. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element.

Example:

   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K")
   integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
   
   print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))

prints:

   [5120, 100, 655360, 268435456]

Equivalent form of expr.copy() is just expr():

   integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")

setName(self, name)

source code 

Define name for this expression, makes debugging and exception messages clearer.

Example:

   Word(nums).parseString("ABC")  # -> Exception: Expected W:(0123...) (at char 0), (line:1, col:1)
   Word(nums).setName("integer").parseString("ABC")  # -> Exception: Expected integer (at char 0), (line:1, col:1)

setResultsName(self, name, listAllMatches=False)

source code 

Define name for referencing matching tokens as a nested attribute of the returned parse results. NOTE: this returns a *copy* of the original ParserElement object; this is so that the client can define a basic element, such as an integer, and reference it in multiple places with different names.

You can also set results names using the abbreviated syntax, expr("name") in place of expr.setResultsName("name") - see __call__.

Example:

   date_str = (integer.setResultsName("year") + '/' 
               + integer.setResultsName("month") + '/' 
               + integer.setResultsName("day"))

   # equivalent form:
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")

setBreak(self, breakFlag=True)

source code 

Method to invoke the Python pdb debugger when this element is about to be parsed. Set breakFlag to True to enable, False to disable.

setParseAction(self, *fns, **kwargs)

source code 

Define action to perform when successfully matching parse element definition. Parse action fn is a callable method with 0-3 arguments, called as fn(s,loc,toks), fn(loc,toks), fn(toks), or just fn(), where:

  • s = the original string being parsed (see note below)
  • loc = the location of the matching substring
  • toks = a list of the matched tokens, packaged as a ParseResults object

If the functions in fns modify the tokens, they can return them as the return value from fn, and the modified list of tokens will replace the original. Otherwise, fn does not need to return any value.

Optional keyword arguments:

  • callDuringTry = (default=False) indicate if parse action should be run during lookaheads and alternate testing

Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See parseString for more information on parsing strings containing <TAB>s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string.

Example:

   integer = Word(nums)
   date_str = integer + '/' + integer + '/' + integer

   date_str.parseString("1999/12/31")  # -> ['1999', '/', '12', '/', '31']

   # use parse action to convert to ints at parse time
   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   date_str = integer + '/' + integer + '/' + integer

   # note that integer fields are now ints, not strings
   date_str.parseString("1999/12/31")  # -> [1999, '/', 12, '/', 31]

addParseAction(self, *fns, **kwargs)

source code 

Add parse action to expression's list of parse actions. See setParseAction.

See examples in copy.

addCondition(self, *fns, **kwargs)

source code 

Add a boolean predicate function to expression's list of parse actions. See setParseAction for function call signatures. Unlike setParseAction, functions passed to addCondition need to return boolean success/fail of the condition.

Optional keyword arguments:

  • message = define a custom message to be used in the raised exception
  • fatal = if True, will raise ParseFatalException to stop parsing immediately; otherwise will raise ParseException

Example:

   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   year_int = integer.copy()
   year_int.addCondition(lambda toks: toks[0] >= 2000, message="Only support years 2000 and later")
   date_str = year_int + '/' + integer + '/' + integer

   result = date_str.parseString("1999/12/31")  # -> Exception: Only support years 2000 and later (at char 0), (line:1, col:1)

setFailAction(self, fn)

source code 

Define action to perform if parsing fails at this expression. Fail acton fn is a callable function that takes the arguments fn(s,loc,expr,err) where:

  • s = string being parsed
  • loc = location where expression match was attempted and failed
  • expr = the parse expression that failed
  • err = the exception thrown

The function returns no value. It may throw ParseFatalException if it is desired to stop parsing immediately.

enablePackrat(cache_size_limit=128)
Static Method

source code 

Enables "packrat" parsing, which adds memoizing to the parsing logic. Repeated parse attempts at the same string location (which happens often in many complex grammars) can immediately return a cached value, instead of re-executing parsing/validating code. Memoizing is done of both valid results and parsing exceptions.

Parameters:

  • cache_size_limit - (default=128) - if an integer value is provided will limit the size of the packrat cache; if None is passed, then the cache size will be unbounded; if 0 is passed, the cache will be effectively disabled.

This speedup may break existing programs that use parse actions that have side-effects. For this reason, packrat parsing is disabled when you first import pyparsing. To activate the packrat feature, your program must call the class method ParserElement.enablePackrat(). If your program uses psyco to "compile as you go", you must call enablePackrat before calling psyco.full(). If you do not do this, Python will crash. For best results, call enablePackrat() immediately after importing pyparsing.

Example:

   import pyparsing
   pyparsing.ParserElement.enablePackrat()

parseString(self, instring, parseAll=False)

source code 

Execute the parse expression with the given string. This is the main interface to the client code, once the complete expression has been built.

If you want the grammar to require that the entire input string be successfully parsed, then set parseAll to True (equivalent to ending the grammar with StringEnd()).

Note: parseString implicitly calls expandtabs() on the input string, in order to report proper column numbers in parse actions. If the input string contains tabs and the grammar uses parse actions that use the loc argument to index into the string being parsed, you can ensure you have a consistent view of the input string by:

  • calling parseWithTabs on your grammar before calling parseString (see parseWithTabs)
  • define your parse action using the full (s,loc,toks) signature, and reference the input string using the parse action's s argument
  • explictly expand the tabs in your input string before calling parseString

Example:

   Word('a').parseString('aaaaabaaa')  # -> ['aaaaa']
   Word('a').parseString('aaaaabaaa', parseAll=True)  # -> Exception: Expected end of text

scanString(self, instring, maxMatches=2147483647, overlap=False)

source code 

Scan the input string for expression matches. Each match will return the matching tokens, start location, and end location. May be called with optional maxMatches argument, to clip scanning after 'n' matches are found. If overlap is specified, then overlapping matches will be reported.

Note that the start and end locations are reported relative to the string being parsed. See parseString for more information on parsing strings with embedded tabs.

Example:

   source = "sldjf123lsdjjkf345sldkjf879lkjsfd987"
   print(source)
   for tokens,start,end in Word(alphas).scanString(source):
       print(' '*start + '^'*(end-start))
       print(' '*start + tokens[0])

prints:

   sldjf123lsdjjkf345sldkjf879lkjsfd987
   ^^^^^
   sldjf
           ^^^^^^^
           lsdjjkf
                     ^^^^^^
                     sldkjf
                              ^^^^^^
                              lkjsfd

transformString(self, instring)

source code 

Extension to scanString, to modify matching text with modified tokens that may be returned from a parse action. To use transformString, define a grammar and attach a parse action to it that modifies the returned token list. Invoking transformString() on a target string will then scan for matches, and replace the matched text patterns according to the logic in the parse action. transformString() returns the resulting transformed string.

Example:

   wd = Word(alphas)
   wd.setParseAction(lambda toks: toks[0].title())
   
   print(wd.transformString("now is the winter of our discontent made glorious summer by this sun of york."))

Prints:

   Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York.

searchString(self, instring, maxMatches=2147483647)

source code 

Another extension to scanString, simplifying the access to the tokens found to match the given parse expression. May be called with optional maxMatches argument, to clip searching after 'n' matches are found.

Example:

   # a capitalized word starts with an uppercase letter, followed by zero or more lowercase letters
   cap_word = Word(alphas.upper(), alphas.lower())
   
   print(cap_word.searchString("More than Iron, more than Lead, more than Gold I need Electricity"))

prints:

   ['More', 'Iron', 'Lead', 'Gold', 'I']

split(self, instring, maxsplit=2147483647, includeSeparators=False)

source code 

Generator method to split a string using the given expression as a separator. May be called with optional maxsplit argument, to limit the number of splits; and the optional includeSeparators argument (default=False), if the separating matching text should be included in the split results.

Example:

   punc = oneOf(list(".,;:/-!?"))
   print(list(punc.split("This, this?, this sentence, is badly punctuated!")))

prints:

   ['This', ' this', '', ' this sentence', ' is badly punctuated', '']

__add__(self, other)
(Addition operator)

source code 

Implementation of + operator - returns And. Adding strings to a ParserElement converts them to Literals by default.

Example:

   greet = Word(alphas) + "," + Word(alphas) + "!"
   hello = "Hello, World!"
   print (hello, "->", greet.parseString(hello))

Prints:

   Hello, World! -> ['Hello', ',', 'World', '!']

__mul__(self, other)

source code 

Implementation of * operator, allows use of expr * 3 in place of expr + expr + expr. Expressions may also me multiplied by a 2-integer tuple, similar to {min,max} multipliers in regular expressions. Tuples may also include None as in:

  • expr*(n,None) or expr*(n,) is equivalent to expr*n + ZeroOrMore(expr) (read as "at least n instances of expr")
  • expr*(None,n) is equivalent to expr*(0,n) (read as "0 to n instances of expr")
  • expr*(None,None) is equivalent to ZeroOrMore(expr)
  • expr*(1,None) is equivalent to OneOrMore(expr)

Note that expr*(None,n) does not raise an exception if more than n exprs exist in the input stream; that is, expr*(None,n) does not enforce a maximum number of expr occurrences. If this behavior is desired, then write expr*(None,n) + ~expr

__call__(self, name=None)
(Call operator)

source code 

Shortcut for setResultsName, with listAllMatches=False.

If name is given with a trailing '*' character, then listAllMatches will be passed as True.

If name is omitted, same as calling copy.

Example:

   # these are equivalent
   userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno")
   userdata = Word(alphas)("name") + Word(nums+"-")("socsecno")

leaveWhitespace(self)

source code 

Disables the skipping of whitespace before matching the characters in the ParserElement's defined pattern. This is normally only used internally by the pyparsing module, but may be needed in some whitespace-sensitive grammars.

parseWithTabs(self)

source code 

Overrides default behavior to expand <TAB>s to spaces before parsing the input string. Must be called before parseString when the input grammar contains elements that match <TAB> characters.

ignore(self, other)

source code 

Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns.

Example:

   patt = OneOrMore(Word(alphas))
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj']
   
   patt.ignore(cStyleComment)
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd']

setDebug(self, flag=True)

source code 

Enable display of debugging messages while doing pattern matching. Set flag to True to enable, False to disable.

Example:

   wd = Word(alphas).setName("alphaword")
   integer = Word(nums).setName("numword")
   term = wd | integer
   
   # turn on debugging for wd
   wd.setDebug()

   OneOrMore(term).parseString("abc 123 xyz 890")

prints:

   Match alphaword at loc 0(1,1)
   Matched alphaword -> ['abc']
   Match alphaword at loc 3(1,4)
   Exception raised:Expected alphaword (at char 4), (line:1, col:5)
   Match alphaword at loc 7(1,8)
   Matched alphaword -> ['xyz']
   Match alphaword at loc 11(1,12)
   Exception raised:Expected alphaword (at char 12), (line:1, col:13)
   Match alphaword at loc 15(1,16)
   Exception raised:Expected alphaword (at char 15), (line:1, col:16)

The output shown is that produced by the default debug actions - custom debug actions can be specified using setDebugActions. Prior to attempting to match the wd expression, the debugging message "Match <exprname> at loc <n>(<line>,<col>)" is shown. Then if the parse succeeds, a "Matched" message is shown, or an "Exception raised" message is shown. Also note the use of setName to assign a human-readable name to the expression, which makes debugging and exception messages easier to understand - for instance, the default name created for the Word expression without calling setName is "W:(ABCD...)".

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

__repr__(self)
(Representation operator)

source code 

repr(x)

Overrides: object.__repr__
(inherited documentation)

parseFile(self, file_or_filename, parseAll=False)

source code 

Execute the parse expression on the given file or filename. If a filename is specified (instead of a file object), the entire file is opened, read, and closed before parsing.

__hash__(self)
(Hashing function)

source code 

hash(x)

Overrides: object.__hash__
(inherited documentation)

matches(self, testString, parseAll=True)

source code 

Method for quick testing of a parser against a test string. Good for simple inline microtests of sub expressions while building up larger parser.

Parameters:

  • testString - to test against this expression for a match
  • parseAll - (default=True) - flag to pass to parseString when running tests

Example:

   expr = Word(nums)
   assert expr.matches("100")

runTests(self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False)

source code 

Execute the parse expression on a series of test strings, showing each test, the parsed results or where the parse failed. Quick and easy way to run a parse expression against a list of sample strings.

Parameters:

  • tests - a list of separate test strings, or a multiline string of test strings
  • parseAll - (default=True) - flag to pass to parseString when running tests
  • comment - (default='#') - expression for indicating embedded comments in the test string; pass None to disable comment filtering
  • fullDump - (default=True) - dump results as list followed by results names in nested outline; if False, only dump nested list
  • printResults - (default=True) prints test output to stdout
  • failureTests - (default=False) indicates if these tests are expected to fail parsing

Returns: a (success, results) tuple, where success indicates that all tests succeeded (or failed if failureTests is True), and the results contain a list of lines of each test's output

Example:

   number_expr = pyparsing_common.number.copy()

   result = number_expr.runTests('''
       # unsigned integer
       100
       # negative integer
       -100
       # float with scientific notation
       6.02e23
       # integer with scientific notation
       1e-12
       ''')
   print("Success" if result[0] else "Failed!")

   result = number_expr.runTests('''
       # stray character
       100Z
       # missing leading digit before '.'
       -.100
       # too many '.'
       3.14.159
       ''', failureTests=True)
   print("Success" if result[0] else "Failed!")

prints:

   # unsigned integer
   100
   [100]

   # negative integer
   -100
   [-100]

   # float with scientific notation
   6.02e23
   [6.02e+23]

   # integer with scientific notation
   1e-12
   [1e-12]

   Success
   
   # stray character
   100Z
      ^
   FAIL: Expected end of text (at char 3), (line:1, col:4)

   # missing leading digit before '.'
   -.100
   ^
   FAIL: Expected {real number with scientific notation | real number | signed integer} (at char 0), (line:1, col:1)

   # too many '.'
   3.14.159
       ^
   FAIL: Expected end of text (at char 4), (line:1, col:5)

   Success

Each test string must be on a single line. If you want to test a string that spans multiple lines, create a test like this:

   expr.runTest(r"this is a test\n of strings that spans \n 3 lines")

(Note that this is a raw string literal, you must include the leading 'r'.)


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Module pyparsing :: Class ParseResults
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Class ParseResults

source code

object --+
         |
        ParseResults

Structured parse results, to provide multiple means of access to the parsed data:

  • as a list (len(results))
  • by list index (results[0], results[1], etc.)
  • by attribute (results.<resultsName> - see ParserElement.setResultsName)

Example:

   integer = Word(nums)
   date_str = (integer.setResultsName("year") + '/' 
                   + integer.setResultsName("month") + '/' 
                   + integer.setResultsName("day"))
   # equivalent form:
   # date_str = integer("year") + '/' + integer("month") + '/' + integer("day")

   # parseString returns a ParseResults object
   result = date_str.parseString("1999/12/31")

   def test(s, fn=repr):
       print("%s -> %s" % (s, fn(eval(s))))
   test("list(result)")
   test("result[0]")
   test("result['month']")
   test("result.day")
   test("'month' in result")
   test("'minutes' in result")
   test("result.dump()", str)

prints:

   list(result) -> ['1999', '/', '12', '/', '31']
   result[0] -> '1999'
   result['month'] -> '12'
   result.day -> '31'
   'month' in result -> True
   'minutes' in result -> False
   result.dump() -> ['1999', '/', '12', '/', '31']
   - day: 31
   - month: 12
   - year: 1999
Instance Methods
 
__init__(self, toklist=None, name=None, asList=True, modal=True, isinstance=<built-in function isinstance>)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
__getitem__(self, i) source code
 
__setitem__(self, k, v, isinstance=<built-in function isinstance>) source code
 
__delitem__(self, i) source code
 
__contains__(self, k) source code
 
__len__(self) source code
 
__bool__(self) source code
 
__nonzero__(self) source code
 
__iter__(self) source code
 
__reversed__(self) source code
 
iterkeys(self)
Returns an iterator of all named result keys (Python 2.x only).		 source code
 
itervalues(self)
Returns an iterator of all named result values (Python 2.x only).		 source code
 
iteritems(self)
Returns an iterator of all named result key-value tuples (Python 2.x only).		 source code
 
keys(self)
Returns all named result keys (as a list in Python 2.x, as an iterator in Python 3.x).		 source code
 
values(self)
Returns all named result values (as a list in Python 2.x, as an iterator in Python 3.x).		 source code
 
items(self)
Returns all named result key-values (as a list of tuples in Python 2.x, as an iterator in Python 3.x).		 source code
 
haskeys(self)
Since keys() returns an iterator, this method is helpful in bypassing code that looks for the existence of any defined results names.		 source code
 
pop(self, *args, **kwargs)
Removes and returns item at specified index (default=last).		 source code
 
get(self, key, defaultValue=None)
Returns named result matching the given key, or if there is no such name, then returns the given defaultValue or None if no defaultValue is specified.		 source code
 
insert(self, index, insStr)
Inserts new element at location index in the list of parsed tokens.		 source code
 
append(self, item)
Add single element to end of ParseResults list of elements.		 source code
 
extend(self, itemseq)
Add sequence of elements to end of ParseResults list of elements.		 source code
 
clear(self)
Clear all elements and results names.		 source code
 
__getattr__(self, name) source code
 
__add__(self, other) source code
 
__iadd__(self, other) source code
 
__radd__(self, other) source code
 
__repr__(self)
repr(x)		 source code
 
__str__(self)
str(x)		 source code
 
asList(self)
Returns the parse results as a nested list of matching tokens, all converted to strings.		 source code
 
asDict(self)
Returns the named parse results as a nested dictionary.		 source code
 
copy(self)
Returns a new copy of a ParseResults object.		 source code
 
asXML(self, doctag=None, namedItemsOnly=False, indent='', formatted=True)
(Deprecated) Returns the parse results as XML.		 source code
 
getName(self)
Returns the results name for this token expression.		 source code
 
dump(self, indent='', depth=0, full=True)
Diagnostic method for listing out the contents of a ParseResults.		 source code
 
pprint(self, *args, **kwargs)
Pretty-printer for parsed results as a list, using the pprint module.		 source code
 
__getstate__(self) source code
 
__setstate__(self, state) source code
 
__getnewargs__(self) source code
 
__dir__(self) source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods
a new object with type S, a subtype of T
__new__(cls, toklist=None, name=None, asList=True, modal=True) source code
Properties

Inherited from object: __class__

Method Details

__new__(cls, toklist=None, name=None, asList=True, modal=True)
Static Method

source code 
Returns: a new object with type S, a subtype of T
Overrides: object.__new__
(inherited documentation)

__init__(self, toklist=None, name=None, asList=True, modal=True, isinstance=<built-in function isinstance>)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

pop(self, *args, **kwargs)

source code 

Removes and returns item at specified index (default=last). Supports both list and dict semantics for pop(). If passed no argument or an integer argument, it will use list semantics and pop tokens from the list of parsed tokens. If passed a non-integer argument (most likely a string), it will use dict semantics and pop the corresponding value from any defined results names. A second default return value argument is supported, just as in dict.pop().

Example:

   def remove_first(tokens):
       tokens.pop(0)
   print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321']
   print(OneOrMore(Word(nums)).addParseAction(remove_first).parseString("0 123 321")) # -> ['123', '321']

   label = Word(alphas)
   patt = label("LABEL") + OneOrMore(Word(nums))
   print(patt.parseString("AAB 123 321").dump())

   # Use pop() in a parse action to remove named result (note that corresponding value is not
   # removed from list form of results)
   def remove_LABEL(tokens):
       tokens.pop("LABEL")
       return tokens
   patt.addParseAction(remove_LABEL)
   print(patt.parseString("AAB 123 321").dump())

prints:

   ['AAB', '123', '321']
   - LABEL: AAB

   ['AAB', '123', '321']

get(self, key, defaultValue=None)

source code 

Returns named result matching the given key, or if there is no such name, then returns the given defaultValue or None if no defaultValue is specified.

Similar to dict.get().

Example:

   integer = Word(nums)
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")           

   result = date_str.parseString("1999/12/31")
   print(result.get("year")) # -> '1999'
   print(result.get("hour", "not specified")) # -> 'not specified'
   print(result.get("hour")) # -> None

insert(self, index, insStr)

source code 

Inserts new element at location index in the list of parsed tokens.

Similar to list.insert().

Example:

   print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321']

   # use a parse action to insert the parse location in the front of the parsed results
   def insert_locn(locn, tokens):
       tokens.insert(0, locn)
   print(OneOrMore(Word(nums)).addParseAction(insert_locn).parseString("0 123 321")) # -> [0, '0', '123', '321']

append(self, item)

source code 

Add single element to end of ParseResults list of elements.

Example:

   print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321']
   
   # use a parse action to compute the sum of the parsed integers, and add it to the end
   def append_sum(tokens):
       tokens.append(sum(map(int, tokens)))
   print(OneOrMore(Word(nums)).addParseAction(append_sum).parseString("0 123 321")) # -> ['0', '123', '321', 444]

extend(self, itemseq)

source code 

Add sequence of elements to end of ParseResults list of elements.

Example:

   patt = OneOrMore(Word(alphas))
   
   # use a parse action to append the reverse of the matched strings, to make a palindrome
   def make_palindrome(tokens):
       tokens.extend(reversed([t[::-1] for t in tokens]))
       return ''.join(tokens)
   print(patt.addParseAction(make_palindrome).parseString("lskdj sdlkjf lksd")) # -> 'lskdjsdlkjflksddsklfjkldsjdksl'

__repr__(self)
(Representation operator)

source code 

repr(x)

Overrides: object.__repr__
(inherited documentation)

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

asList(self)

source code 

Returns the parse results as a nested list of matching tokens, all converted to strings.

Example:

   patt = OneOrMore(Word(alphas))
   result = patt.parseString("sldkj lsdkj sldkj")
   # even though the result prints in string-like form, it is actually a pyparsing ParseResults
   print(type(result), result) # -> <class 'pyparsing.ParseResults'> ['sldkj', 'lsdkj', 'sldkj']
   
   # Use asList() to create an actual list
   result_list = result.asList()
   print(type(result_list), result_list) # -> <class 'list'> ['sldkj', 'lsdkj', 'sldkj']

asDict(self)

source code 

Returns the named parse results as a nested dictionary.

Example:

   integer = Word(nums)
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
   
   result = date_str.parseString('12/31/1999')
   print(type(result), repr(result)) # -> <class 'pyparsing.ParseResults'> (['12', '/', '31', '/', '1999'], {'day': [('1999', 4)], 'year': [('12', 0)], 'month': [('31', 2)]})
   
   result_dict = result.asDict()
   print(type(result_dict), repr(result_dict)) # -> <class 'dict'> {'day': '1999', 'year': '12', 'month': '31'}

   # even though a ParseResults supports dict-like access, sometime you just need to have a dict
   import json
   print(json.dumps(result)) # -> Exception: TypeError: ... is not JSON serializable
   print(json.dumps(result.asDict())) # -> {"month": "31", "day": "1999", "year": "12"}

asXML(self, doctag=None, namedItemsOnly=False, indent='', formatted=True)

source code 

(Deprecated) Returns the parse results as XML. Tags are created for tokens and lists that have defined results names.

getName(self)

source code 

Returns the results name for this token expression. Useful when several different expressions might match at a particular location.

Example:

   integer = Word(nums)
   ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d")
   house_number_expr = Suppress('#') + Word(nums, alphanums)
   user_data = (Group(house_number_expr)("house_number") 
               | Group(ssn_expr)("ssn")
               | Group(integer)("age"))
   user_info = OneOrMore(user_data)
   
   result = user_info.parseString("22 111-22-3333 #221B")
   for item in result:
       print(item.getName(), ':', item[0])

prints:

   age : 22
   ssn : 111-22-3333
   house_number : 221B

dump(self, indent='', depth=0, full=True)

source code 

Diagnostic method for listing out the contents of a ParseResults. Accepts an optional indent argument so that this string can be embedded in a nested display of other data.

Example:

   integer = Word(nums)
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
   
   result = date_str.parseString('12/31/1999')
   print(result.dump())

prints:

   ['12', '/', '31', '/', '1999']
   - day: 1999
   - month: 31
   - year: 12

pprint(self, *args, **kwargs)

source code 

Pretty-printer for parsed results as a list, using the pprint module. Accepts additional positional or keyword args as defined for the pprint.pprint method. (http://docs.python.org/3/library/pprint.html#pprint.pprint)

Example:

   ident = Word(alphas, alphanums)
   num = Word(nums)
   func = Forward()
   term = ident | num | Group('(' + func + ')')
   func <<= ident + Group(Optional(delimitedList(term)))
   result = func.parseString("fna a,b,(fnb c,d,200),100")
   result.pprint(width=40)

prints:

   ['fna',
    ['a',
     'b',
     ['(', 'fnb', ['c', 'd', '200'], ')'],
     '100']]

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Module pyparsing :: Class ParseSyntaxException
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Class ParseSyntaxException

source code

              object --+                
                       |                
exceptions.BaseException --+            
                           |            
        exceptions.Exception --+        
                               |        
              ParseBaseException --+    
                                   |    
                 ParseFatalException --+
                                       |
                                      ParseSyntaxException

just like ParseFatalException, but thrown internally when an ErrorStop ('-' operator) indicates that parsing is to stop immediately because an unbacktrackable syntax error has been found

Instance Methods

Inherited from ParseBaseException: __dir__, __getattr__, __init__, __repr__, __str__, markInputline

Inherited from exceptions.Exception: __new__

Inherited from exceptions.BaseException: __delattr__, __getattribute__, __getitem__, __getslice__, __reduce__, __setattr__, __setstate__, __unicode__

Inherited from object: __format__, __hash__, __reduce_ex__, __sizeof__, __subclasshook__

Properties

Inherited from exceptions.BaseException: args, message

Inherited from object: __class__

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Module pyparsing :: Class pyparsing_common
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Class pyparsing_common

source code

Here are some common low-level expressions that may be useful in jump-starting parser development:

Parse actions:

Example:

   pyparsing_common.number.runTests('''
       # any int or real number, returned as the appropriate type
       100
       -100
       +100
       3.14159
       6.02e23
       1e-12
       ''')

   pyparsing_common.fnumber.runTests('''
       # any int or real number, returned as float
       100
       -100
       +100
       3.14159
       6.02e23
       1e-12
       ''')

   pyparsing_common.hex_integer.runTests('''
       # hex numbers
       100
       FF
       ''')

   pyparsing_common.fraction.runTests('''
       # fractions
       1/2
       -3/4
       ''')

   pyparsing_common.mixed_integer.runTests('''
       # mixed fractions
       1
       1/2
       -3/4
       1-3/4
       ''')

   import uuid
   pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID))
   pyparsing_common.uuid.runTests('''
       # uuid
       12345678-1234-5678-1234-567812345678
       ''')

prints:

   # any int or real number, returned as the appropriate type
   100
   [100]

   -100
   [-100]

   +100
   [100]

   3.14159
   [3.14159]

   6.02e23
   [6.02e+23]

   1e-12
   [1e-12]

   # any int or real number, returned as float
   100
   [100.0]

   -100
   [-100.0]

   +100
   [100.0]

   3.14159
   [3.14159]

   6.02e23
   [6.02e+23]

   1e-12
   [1e-12]

   # hex numbers
   100
   [256]

   FF
   [255]

   # fractions
   1/2
   [0.5]

   -3/4
   [-0.75]

   # mixed fractions
   1
   [1]

   1/2
   [0.5]

   -3/4
   [-0.75]

   1-3/4
   [1.75]

   # uuid
   12345678-1234-5678-1234-567812345678
   [UUID('12345678-1234-5678-1234-567812345678')]
Instance Methods
 
convertToInteger(s, l, t)
Parse action for converting parsed integers to Python int		 source code
 
convertToFloat(s, l, t)
Parse action for converting parsed numbers to Python float		 source code
Static Methods
 
convertToDate(fmt='%Y-%m-%d')
Helper to create a parse action for converting parsed date string to Python datetime.date		 source code
 
convertToDatetime(fmt='%Y-%m-%dT%H:%M:%S.%f')
Helper to create a parse action for converting parsed datetime string to Python datetime.datetime		 source code
 
stripHTMLTags(s, l, tokens)
Parse action to remove HTML tags from web page HTML source		 source code
 
upcaseTokens(s, l, t)
Parse action to convert tokens to upper case.		 source code
 
downcaseTokens(s, l, t)
Parse action to convert tokens to lower case.		 source code
Class Variables
  integer = integer
expression that parses an unsigned integer, returns an int
  hex_integer = hex integer
expression that parses a hexadecimal integer, returns an int
  signed_integer = signed integer
expression that parses an integer with optional leading sign, returns an int
  fraction = fraction
fractional expression of an integer divided by an integer, returns a float
  mixed_integer = fraction or mixed integer-fraction
mixed integer of the form 'integer - fraction', with optional leading integer, returns float
  real = real number
expression that parses a floating point number and returns a float
  sci_real = real number with scientific notation
expression that parses a floating point number with optional scientific notation and returns a float
  number = {real number with scientific notation | real number |...
any numeric expression, returns the corresponding Python type
  fnumber = fnumber
any int or real number, returned as float
  identifier = identifier
typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')
  ipv4_address = IPv4 address
IPv4 address (0.0.0.0 - 255.255.255.255)
  ipv6_address = IPv6 address
IPv6 address (long, short, or mixed form)
  mac_address = MAC address
MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)
  iso8601_date = ISO8601 date
ISO8601 date (yyyy-mm-dd)
  iso8601_datetime = ISO8601 datetime
ISO8601 datetime (yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)) - trailing seconds, milliseconds, and timezone optional; accepts separating 'T' or ' '
  uuid = UUID
UUID (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)
  comma_separated_list = comma separated list
Predefined expression of 1 or more printable words or quoted strings, separated by commas.
Method Details

convertToDate(fmt='%Y-%m-%d')
Static Method

source code 

Helper to create a parse action for converting parsed date string to Python datetime.date

Params -

  • fmt - format to be passed to datetime.strptime (default="%Y-%m-%d")

Example:

   date_expr = pyparsing_common.iso8601_date.copy()
   date_expr.setParseAction(pyparsing_common.convertToDate())
   print(date_expr.parseString("1999-12-31"))

prints:

   [datetime.date(1999, 12, 31)]

convertToDatetime(fmt='%Y-%m-%dT%H:%M:%S.%f')
Static Method

source code 

Helper to create a parse action for converting parsed datetime string to Python datetime.datetime

Params -

  • fmt - format to be passed to datetime.strptime (default="%Y-%m-%dT%H:%M:%S.%f")

Example:

   dt_expr = pyparsing_common.iso8601_datetime.copy()
   dt_expr.setParseAction(pyparsing_common.convertToDatetime())
   print(dt_expr.parseString("1999-12-31T23:59:59.999"))

prints:

   [datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)]

stripHTMLTags(s, l, tokens)
Static Method

source code 

Parse action to remove HTML tags from web page HTML source

Example:

   # strip HTML links from normal text 
   text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>'
   td,td_end = makeHTMLTags("TD")
   table_text = td + SkipTo(td_end).setParseAction(pyparsing_common.stripHTMLTags)("body") + td_end
   
   print(table_text.parseString(text).body) # -> 'More info at the pyparsing wiki page'

Class Variable Details

number

any numeric expression, returns the corresponding Python type

Value:
{real number with scientific notation | real number | signed integer}

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pyparsing
Module pyparsing :: Class QuotedString
[frames] | no frames]

Class QuotedString

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   QuotedString

Token for matching strings that are delimited by quoting characters.

Defined with the following parameters:

  • quoteChar - string of one or more characters defining the quote delimiting string
  • escChar - character to escape quotes, typically backslash (default=None)
  • escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=None)
  • multiline - boolean indicating whether quotes can span multiple lines (default=False)
  • unquoteResults - boolean indicating whether the matched text should be unquoted (default=True)
  • endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=None => same as quoteChar)
  • convertWhitespaceEscapes - convert escaped whitespace ('\t', '\n', etc.) to actual whitespace (default=True)

Example:

   qs = QuotedString('"')
   print(qs.searchString('lsjdf "This is the quote" sldjf'))
   complex_qs = QuotedString('{{', endQuoteChar='}}')
   print(complex_qs.searchString('lsjdf {{This is the "quote"}} sldjf'))
   sql_qs = QuotedString('"', escQuote='""')
   print(sql_qs.searchString('lsjdf "This is the quote with ""embedded"" quotes" sldjf'))

prints:

   [['This is the quote']]
   [['This is the "quote"']]
   [['This is the quote with "embedded" quotes']]
Instance Methods
 
__init__(self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None, convertWhitespaceEscapes=True)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None, convertWhitespaceEscapes=True)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Module pyparsing :: Class Recipes
[frames] | no frames]

Class Recipes

source code

Here are some common low-level expressions that may be useful in jump-starting your parser development:
Instance Methods
 
convertToInteger(t)
Parse action for converting parsed integers to Python int		 source code
 
convertToFloat(t)
Parse action for converting parsed numbers to Python float		 source code
Class Variables
  integer = integer
  signedInteger = signed integer
  real = real number
  sciReal = real number with scientfic notation
  numeric = {real number with scientfic notation | real number |...
  number = number
  identifier = identifier
Class Variable Details

numeric

Value:
{real number with scientfic notation | real number | integer | signed \
integer}

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pyparsing
Module pyparsing :: Class RecursiveGrammarException
[frames] | no frames]

Class RecursiveGrammarException

source code

              object --+        
                       |        
exceptions.BaseException --+    
                           |    
        exceptions.Exception --+
                               |
                              RecursiveGrammarException

exception thrown by ParserElement.validate if the grammar could be improperly recursive

Instance Methods
 
__init__(self, parseElementList)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
__str__(self)
str(x)		 source code

Inherited from exceptions.Exception: __new__

Inherited from exceptions.BaseException: __delattr__, __getattribute__, __getitem__, __getslice__, __reduce__, __repr__, __setattr__, __setstate__, __unicode__

Inherited from object: __format__, __hash__, __reduce_ex__, __sizeof__, __subclasshook__

Properties

Inherited from exceptions.BaseException: args, message

Inherited from object: __class__

Method Details

__init__(self, parseElementList)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Module pyparsing :: Class Regex
[frames] | no frames]

Class Regex

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   Regex

Token for matching strings that match a given regular expression. Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module. If the given regex contains named groups (defined using (?P<name>...)), these will be preserved as named parse results.

Example:

   realnum = Regex(r"[+-]?\d+\.\d*")
   date = Regex(r'(?P<year>\d{4})-(?P<month>\d\d?)-(?P<day>\d\d?)')
   # ref: http://stackoverflow.com/questions/267399/how-do-you-match-only-valid-roman-numerals-with-a-regular-expression
   roman = Regex(r"M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})")
Nested Classes
  compiledREtype
Compiled regular expression objects
Instance Methods
 
__init__(self, pattern, flags=0)
The parameters pattern and flags are passed to the re.compile() function as-is.		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, pattern, flags=0)
(Constructor)

source code 

The parameters pattern and flags are passed to the re.compile() function as-is. See the Python re module for an explanation of the acceptable patterns and flags.

Overrides: object.__init__

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Module pyparsing :: Class Regex :: Class compiledREtype
[frames] | no frames]

Class compiledREtype

object --+
         |
        pyparsing.Regex.compiledREtype

Compiled regular expression objects

Instance Methods
 
__copy__(...)
 
__deepcopy__(...)
 
findall(...)
findall(string[, pos[, endpos]]) --> list.
 
finditer(...)
finditer(string[, pos[, endpos]]) --> iterator.
 
match(...)
match(string[, pos[, endpos]]) --> match object or None.
 
scanner(...)
 
search(...)
search(string[, pos[, endpos]]) --> match object or None.
 
split(...)
split(string[, maxsplit = 0]) --> list.
 
sub(...)
sub(repl, string[, count = 0]) --> newstring Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by the replacement repl.
 
subn(repl, string, count=... = 0) --> (newstring, number of subs)
Return the tuple (new_string, number_of_subs_made) found by replacing the leftmost non-overlapping occurrences of pattern with the replacement repl.

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __init__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties
  flags
  groupindex
  groups
  pattern

Inherited from object: __class__

Method Details

findall(...)

 

findall(string[, pos[, endpos]]) --> list. Return a list of all non-overlapping matches of pattern in string.

finditer(...)

 

finditer(string[, pos[, endpos]]) --> iterator. Return an iterator over all non-overlapping matches for the RE pattern in string. For each match, the iterator returns a match object.

match(...)

 

match(string[, pos[, endpos]]) --> match object or None. Matches zero or more characters at the beginning of the string

search(...)

 

search(string[, pos[, endpos]]) --> match object or None. Scan through string looking for a match, and return a corresponding match object instance. Return None if no position in the string matches.

split(...)

 

split(string[, maxsplit = 0]) --> list. Split string by the occurrences of pattern.


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pyparsing
Module pyparsing :: Class SkipTo
[frames] | no frames]

Class SkipTo

source code

     object --+        
              |        
  ParserElement --+    
                  |    
ParseElementEnhance --+
                      |
                     SkipTo

Token for skipping over all undefined text until the matched expression is found.

Parameters:

  • expr - target expression marking the end of the data to be skipped
  • include - (default=False) if True, the target expression is also parsed (the skipped text and target expression are returned as a 2-element list).
  • ignore - (default=None) used to define grammars (typically quoted strings and comments) that might contain false matches to the target expression
  • failOn - (default=None) define expressions that are not allowed to be included in the skipped test; if found before the target expression is found, the SkipTo is not a match

Example:

   report = '''
       Outstanding Issues Report - 1 Jan 2000

          # | Severity | Description                               |  Days Open
       -----+----------+-------------------------------------------+-----------
        101 | Critical | Intermittent system crash                 |          6
         94 | Cosmetic | Spelling error on Login ('log|n')         |         14
         79 | Minor    | System slow when running too many reports |         47
       '''
   integer = Word(nums)
   SEP = Suppress('|')
   # use SkipTo to simply match everything up until the next SEP
   # - ignore quoted strings, so that a '|' character inside a quoted string does not match
   # - parse action will call token.strip() for each matched token, i.e., the description body
   string_data = SkipTo(SEP, ignore=quotedString)
   string_data.setParseAction(tokenMap(str.strip))
   ticket_expr = (integer("issue_num") + SEP 
                 + string_data("sev") + SEP 
                 + string_data("desc") + SEP 
                 + integer("days_open"))
   
   for tkt in ticket_expr.searchString(report):
       print tkt.dump()

prints:

   ['101', 'Critical', 'Intermittent system crash', '6']
   - days_open: 6
   - desc: Intermittent system crash
   - issue_num: 101
   - sev: Critical
   ['94', 'Cosmetic', "Spelling error on Login ('log|n')", '14']
   - days_open: 14
   - desc: Spelling error on Login ('log|n')
   - issue_num: 94
   - sev: Cosmetic
   ['79', 'Minor', 'System slow when running too many reports', '47']
   - days_open: 47
   - desc: System slow when running too many reports
   - issue_num: 79
   - sev: Minor
Instance Methods
 
__init__(self, other, include=False, ignore=None, failOn=None)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParseElementEnhance: __str__, checkRecursion, ignore, leaveWhitespace, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, other, include=False, ignore=None, failOn=None)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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Module pyparsing :: Class StringEnd
[frames] | no frames]

Class StringEnd

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       StringEnd

Matches if current position is at the end of the parse string

Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Module pyparsing :: Class StringStart
[frames] | no frames]

Class StringStart

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       StringStart

Matches if current position is at the beginning of the parse string

Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Module pyparsing :: Class Suppress
[frames] | no frames]

Class Suppress

source code

     object --+            
              |            
  ParserElement --+        
                  |        
ParseElementEnhance --+    
                      |    
         TokenConverter --+
                          |
                         Suppress

Converter for ignoring the results of a parsed expression.

Example:

   source = "a, b, c,d"
   wd = Word(alphas)
   wd_list1 = wd + ZeroOrMore(',' + wd)
   print(wd_list1.parseString(source))

   # often, delimiters that are useful during parsing are just in the
   # way afterward - use Suppress to keep them out of the parsed output
   wd_list2 = wd + ZeroOrMore(Suppress(',') + wd)
   print(wd_list2.parseString(source))

prints:

   ['a', ',', 'b', ',', 'c', ',', 'd']
   ['a', 'b', 'c', 'd']

(See also delimitedList.)

Instance Methods
 
postParse(self, instring, loc, tokenlist) source code
 
suppress(self)
Suppresses the output of this ParserElement; useful to keep punctuation from cluttering up returned output.		 source code

Inherited from TokenConverter: __init__

Inherited from ParseElementEnhance: __str__, checkRecursion, ignore, leaveWhitespace, parseImpl, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

postParse(self, instring, loc, tokenlist)

source code 
Overrides: ParserElement.postParse

suppress(self)

source code 

Suppresses the output of this ParserElement; useful to keep punctuation from cluttering up returned output.

Overrides: ParserElement.suppress
(inherited documentation)

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pyparsing
Module pyparsing :: Class Token
[frames] | no frames]

Class Token

source code

   object --+    
            |    
ParserElement --+
                |
               Token
Known Subclasses:

Abstract ParserElement subclass, for defining atomic matching patterns.

Instance Methods
 
__init__(self)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseImpl, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

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pyparsing
Module pyparsing :: Class TokenConverter
[frames] | no frames]

Class TokenConverter

source code

     object --+        
              |        
  ParserElement --+    
                  |    
ParseElementEnhance --+
                      |
                     TokenConverter
Known Subclasses:

Abstract subclass of ParseExpression, for converting parsed results.

Instance Methods
 
__init__(self, expr, savelist=False)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code

Inherited from ParseElementEnhance: __str__, checkRecursion, ignore, leaveWhitespace, parseImpl, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr, savelist=False)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

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pyparsing
Module pyparsing :: Class White
[frames] | no frames]

Class White

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   White

Special matching class for matching whitespace. Normally, whitespace is ignored by pyparsing grammars. This class is included when some whitespace structures are significant. Define with a string containing the whitespace characters to be matched; default is " \t\r\n". Also takes optional min, max, and exact arguments, as defined for the Word class.

Instance Methods
 
__init__(self, ws=' \t\r\n', min=1, max=0, exact=0)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  whiteStrs = {'\t': '<TAB>', '\n': '<LF>', '\x0c': '<FF>', '\r'...
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, ws=' \t\r\n', min=1, max=0, exact=0)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

Class Variable Details

whiteStrs

Value:
{'\t': '<TAB>',
 '''
''': '<LF>',
 '\x0c': '<FF>',
 '\r': '<CR>',
 ' ': '<SPC>'}

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pyparsing-2.1.10/htmldoc/pyparsing.Word-class.html0000666000000000000000000005316412775575456020352 0ustar 00000000000000 pyparsing.Word
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pyparsing
Module pyparsing :: Class Word
[frames] | no frames]

Class Word

source code

   object --+        
            |        
ParserElement --+    
                |    
            Token --+
                    |
                   Word

Token for matching words composed of allowed character sets. Defined with string containing all allowed initial characters, an optional string containing allowed body characters (if omitted, defaults to the initial character set), and an optional minimum, maximum, and/or exact length. The default value for min is 1 (a minimum value < 1 is not valid); the default values for max and exact are 0, meaning no maximum or exact length restriction. An optional excludeChars parameter can list characters that might be found in the input bodyChars string; useful to define a word of all printables except for one or two characters, for instance.

srange is useful for defining custom character set strings for defining Word expressions, using range notation from regular expression character sets.

A common mistake is to use Word to match a specific literal string, as in Word("Address"). Remember that Word uses the string argument to define sets of matchable characters. This expression would match "Add", "AAA", "dAred", or any other word made up of the characters 'A', 'd', 'r', 'e', and 's'. To match an exact literal string, use Literal or Keyword.

pyparsing includes helper strings for building Words:

  • alphas
  • nums
  • alphanums
  • hexnums
  • alphas8bit (alphabetic characters in ASCII range 128-255 - accented, tilded, umlauted, etc.)
  • punc8bit (non-alphabetic characters in ASCII range 128-255 - currency, symbols, superscripts, diacriticals, etc.)
  • printables (any non-whitespace character)

Example:

   # a word composed of digits
   integer = Word(nums) # equivalent to Word("0123456789") or Word(srange("0-9"))
   
   # a word with a leading capital, and zero or more lowercase
   capital_word = Word(alphas.upper(), alphas.lower())

   # hostnames are alphanumeric, with leading alpha, and '-'
   hostname = Word(alphas, alphanums+'-')
   
   # roman numeral (not a strict parser, accepts invalid mix of characters)
   roman = Word("IVXLCDM")
   
   # any string of non-whitespace characters, except for ','
   csv_value = Word(printables, excludeChars=",")
Instance Methods
 
__init__(self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables
  __slotnames__ = []

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing
Module pyparsing :: Class WordEnd
[frames] | no frames]

Class WordEnd

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       WordEnd

Matches if the current position is at the end of a Word, and is not followed by any character in a given set of wordChars (default=printables). To emulate the  behavior of regular expressions, use WordEnd(alphanums). WordEnd will also match at the end of the string being parsed, or at the end of a line.

Instance Methods
 
__init__(self, wordChars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY...)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, wordChars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY...)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Module pyparsing :: Class WordStart
[frames] | no frames]

Class WordStart

source code

   object --+            
            |            
ParserElement --+        
                |        
            Token --+    
                    |    
       _PositionToken --+
                        |
                       WordStart

Matches if the current position is at the beginning of a Word, and is not preceded by any character in a given set of wordChars (default=printables). To emulate the  behavior of regular expressions, use WordStart(alphanums). WordStart will also match at the beginning of the string being parsed, or at the beginning of a line.

Instance Methods
 
__init__(self, wordChars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY...)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __str__, __sub__, __xor__, addCondition, addParseAction, canParseNext, checkRecursion, copy, ignore, leaveWhitespace, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, streamline, suppress, transformString, tryParse, validate

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, wordChars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY...)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

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pyparsing
Module pyparsing :: Class ZeroOrMore
[frames] | no frames]

Class ZeroOrMore

source code

     object --+            
              |            
  ParserElement --+        
                  |        
ParseElementEnhance --+    
                      |    
         _MultipleMatch --+
                          |
                         ZeroOrMore

Optional repetition of zero or more of the given expression.

Parameters:

  • expr - expression that must match zero or more times
  • stopOn - (default=None) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression)

Example: similar to OneOrMore

Instance Methods
 
__init__(self, expr, stopOn=None)
x.__init__(...) initializes x; see help(type(x)) for signature		 source code
 
parseImpl(self, instring, loc, doActions=True) source code
 
__str__(self)
str(x)		 source code

Inherited from ParseElementEnhance: checkRecursion, ignore, leaveWhitespace, streamline, validate

Inherited from ParserElement: __add__, __and__, __call__, __eq__, __hash__, __invert__, __mul__, __ne__, __or__, __radd__, __rand__, __repr__, __req__, __rmul__, __rne__, __ror__, __rsub__, __rxor__, __sub__, __xor__, addCondition, addParseAction, canParseNext, copy, matches, parseFile, parseString, parseWithTabs, postParse, preParse, runTests, scanString, searchString, setBreak, setDebug, setDebugActions, setFailAction, setName, setParseAction, setResultsName, setWhitespaceChars, split, suppress, transformString, tryParse

Inherited from object: __delattr__, __format__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Static Methods

Inherited from ParserElement: enablePackrat, inlineLiteralsUsing, resetCache, setDefaultWhitespaceChars

Class Variables

Inherited from ParserElement: DEFAULT_WHITE_CHARS, packrat_cache, packrat_cache_lock, packrat_cache_stats, verbose_stacktrace

Properties

Inherited from object: __class__

Method Details

__init__(self, expr, stopOn=None)
(Constructor)

source code 

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__
(inherited documentation)

parseImpl(self, instring, loc, doActions=True)

source code 
Overrides: ParserElement.parseImpl

__str__(self)
(Informal representation operator)

source code 

str(x)

Overrides: object.__str__
(inherited documentation)

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pyparsing-2.1.10/htmldoc/toc-everything.html0000666000000000000000000002672612775575455017273 0ustar 00000000000000 Everything

Everything

All Classes

pyparsing.And
pyparsing.CaselessKeyword
pyparsing.CaselessLiteral
pyparsing.CharsNotIn
pyparsing.CloseMatch
pyparsing.Combine
pyparsing.Dict
pyparsing.Each
pyparsing.Empty
pyparsing.FollowedBy
pyparsing.Forward
pyparsing.GoToColumn
pyparsing.Group
pyparsing.Keyword
pyparsing.LineEnd
pyparsing.LineStart
pyparsing.Literal
pyparsing.MatchFirst
pyparsing.NoMatch
pyparsing.NotAny
pyparsing.OneOrMore
pyparsing.OnlyOnce
pyparsing.Optional
pyparsing.Or
pyparsing.ParseBaseException
pyparsing.ParseElementEnhance
pyparsing.ParseException
pyparsing.ParseExpression
pyparsing.ParseFatalException
pyparsing.ParseResults
pyparsing.ParseSyntaxException
pyparsing.ParserElement
pyparsing.QuotedString
pyparsing.RecursiveGrammarException
pyparsing.Regex
pyparsing.Regex.compiledREtype
pyparsing.SkipTo
pyparsing.StringEnd
pyparsing.StringStart
pyparsing.Suppress
pyparsing.Token
pyparsing.TokenConverter
pyparsing.White
pyparsing.Word
pyparsing.WordEnd
pyparsing.WordStart
pyparsing.ZeroOrMore
pyparsing.pyparsing_common

All Functions

pyparsing.col
pyparsing.countedArray
pyparsing.delimitedList
pyparsing.dictOf
pyparsing.downcaseTokens
pyparsing.indentedBlock
pyparsing.infixNotation
pyparsing.line
pyparsing.lineno
pyparsing.locatedExpr
pyparsing.makeHTMLTags
pyparsing.makeXMLTags
pyparsing.matchOnlyAtCol
pyparsing.matchPreviousExpr
pyparsing.matchPreviousLiteral
pyparsing.nestedExpr
pyparsing.nullDebugAction
pyparsing.oneOf
pyparsing.originalTextFor
pyparsing.removeQuotes
pyparsing.replaceHTMLEntity
pyparsing.replaceWith
pyparsing.srange
pyparsing.tokenMap
pyparsing.traceParseAction
pyparsing.ungroup
pyparsing.upcaseTokens
pyparsing.withAttribute
pyparsing.withClass

All Variables

pyparsing.alphanums
pyparsing.alphas
pyparsing.alphas8bit
pyparsing.anyCloseTag
pyparsing.anyOpenTag
pyparsing.cStyleComment
pyparsing.commaSeparatedList
pyparsing.commonHTMLEntity
pyparsing.cppStyleComment
pyparsing.dblQuotedString
pyparsing.dblSlashComment
pyparsing.empty
pyparsing.hexnums
pyparsing.htmlComment
pyparsing.javaStyleComment
pyparsing.lineEnd
pyparsing.lineStart
pyparsing.nums
pyparsing.opAssoc
pyparsing.printables
pyparsing.punc8bit
pyparsing.pythonStyleComment
pyparsing.quotedString
pyparsing.restOfLine
pyparsing.sglQuotedString
pyparsing.stringEnd
pyparsing.stringStart
pyparsing.unicodeString
pyparsing-2.1.10/htmldoc/toc-pyparsing-module.html0000666000000000000000000002466212775575455020403 0ustar 00000000000000 pyparsing

Module pyparsing

Classes

And
CaselessKeyword
CaselessLiteral
CharsNotIn
CloseMatch
Combine
Dict
Each
Empty
FollowedBy
Forward
GoToColumn
Group
Keyword
LineEnd
LineStart
Literal
MatchFirst
NoMatch
NotAny
OneOrMore
OnlyOnce
Optional
Or
ParseBaseException
ParseElementEnhance
ParseException
ParseExpression
ParseFatalException
ParseResults
ParseSyntaxException
ParserElement
QuotedString
RecursiveGrammarException
Regex
SkipTo
StringEnd
StringStart
Suppress
Token
TokenConverter
White
Word
WordEnd
WordStart
ZeroOrMore
pyparsing_common

Functions

col
countedArray
delimitedList
dictOf
downcaseTokens
indentedBlock
infixNotation
line
lineno
locatedExpr
makeHTMLTags
makeXMLTags
matchOnlyAtCol
matchPreviousExpr
matchPreviousLiteral
nestedExpr
nullDebugAction
oneOf
operatorPrecedence
originalTextFor
removeQuotes
replaceHTMLEntity
replaceWith
srange
tokenMap
traceParseAction
ungroup
upcaseTokens
withAttribute
withClass

Variables

alphanums
alphas
alphas8bit
anyCloseTag
anyOpenTag
cStyleComment
commaSeparatedList
commonHTMLEntity
cppStyleComment
dblQuotedString
dblSlashComment
empty
hexnums
htmlComment
javaStyleComment
lineEnd
lineStart
nums
opAssoc
printables
punc8bit
pythonStyleComment
quotedString
restOfLine
sglQuotedString
stringEnd
stringStart
unicodeString
pyparsing-2.1.10/htmldoc/toc.html0000666000000000000000000000214612775575455015077 0ustar 00000000000000 Table of Contents

Table of Contents

Everything

Modules

pyparsing
pyparsing-2.1.10/LICENSE0000666000000000000000000000202110704710234012737 0ustar 00000000000000Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. pyparsing-2.1.10/MANIFEST.in0000666000000000000000000000037612466013312013503 0ustar 00000000000000include pyparsing.py include HowToUsePyparsing.html pyparsingClassDiagram.* include README CHANGES LICENSE include examples/*.py examples/Setup.ini examples/*.dfm examples/*.ics examples/*.html include htmldoc/*.* include docs/*.* include robots.txt pyparsing-2.1.10/PKG-INFO0000666000000000000000000000166012775575715013066 0ustar 00000000000000Metadata-Version: 1.1 Name: pyparsing Version: 2.1.10 Summary: Python parsing module Home-page: http://pyparsing.wikispaces.com/ Author: Paul McGuire Author-email: ptmcg@users.sourceforge.net License: MIT License Download-URL: http://sourceforge.net/project/showfiles.php?group_id=97203 Description: UNKNOWN Platform: UNKNOWN Classifier: Development Status :: 5 - Production/Stable Classifier: Intended Audience :: Developers Classifier: Intended Audience :: Information Technology Classifier: License :: OSI Approved :: MIT License Classifier: Operating System :: OS Independent Classifier: Programming Language :: Python Classifier: Programming Language :: Python :: 2.6 Classifier: Programming Language :: Python :: 2.7 Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.3 Classifier: Programming Language :: Python :: 3.4 Classifier: Programming Language :: Python :: 3.5 pyparsing-2.1.10/pyparsing.egg-info/0000777000000000000000000000000012775575715015474 5ustar 00000000000000pyparsing-2.1.10/pyparsing.egg-info/dependency_links.txt0000666000000000000000000000000112775575712021537 0ustar 00000000000000 pyparsing-2.1.10/pyparsing.egg-info/PKG-INFO0000666000000000000000000000166012775575712016571 0ustar 00000000000000Metadata-Version: 1.1 Name: pyparsing Version: 2.1.10 Summary: Python parsing module Home-page: http://pyparsing.wikispaces.com/ Author: Paul McGuire Author-email: ptmcg@users.sourceforge.net License: MIT License Download-URL: http://sourceforge.net/project/showfiles.php?group_id=97203 Description: UNKNOWN Platform: UNKNOWN Classifier: Development Status :: 5 - Production/Stable Classifier: Intended Audience :: Developers Classifier: Intended Audience :: Information Technology Classifier: License :: OSI Approved :: MIT License Classifier: Operating System :: OS Independent Classifier: Programming Language :: Python Classifier: Programming Language :: Python :: 2.6 Classifier: Programming Language :: Python :: 2.7 Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.3 Classifier: Programming Language :: Python :: 3.4 Classifier: Programming Language :: Python :: 3.5 pyparsing-2.1.10/pyparsing.egg-info/SOURCES.txt0000666000000000000000000001170312775575712017357 0ustar 00000000000000CHANGES HowToUsePyparsing.html LICENSE MANIFEST.in README pyparsing.py pyparsingClassDiagram.JPG pyparsingClassDiagram.PNG robots.txt setup.cfg setup.py docs/HowToUsePyparsing.html docs/pycon06-AdventureEngineUsingPyparsing-notes.pdf docs/pycon06-IntroToPyparsing-notes.pdf docs/pyparsingClassDiagram.JPG docs/pyparsingClassDiagram.PNG examples/0README.html examples/AcManForm.dfm examples/LAparser.py examples/Setup.ini examples/SimpleCalc.py examples/SingleForm.dfm examples/TAP.py examples/__init__.py examples/adventureEngine.py examples/antlr_grammar.py examples/antlr_grammar_tests.py examples/apicheck.py examples/btpyparse.py examples/builtin_parse_action_demo.py examples/cLibHeader.py examples/chemicalFormulas.py examples/commasep.py examples/configParse.py examples/cpp_enum_parser.py examples/datetimeParseActions.py examples/deltaTime.py examples/dfmparse.py examples/dhcpd_leases_parser.py examples/dictExample.py examples/dictExample2.py examples/ebnf.py examples/ebnftest.py examples/eval_arith.py examples/excelExpr.py examples/fourFn.py examples/gen_ctypes.py examples/getNTPservers.py examples/getNTPserversNew.py examples/greeting.py examples/greetingInGreek.py examples/greetingInKorean.py examples/groupUsingListAllMatches.py examples/holaMundo.py examples/htmlStripper.py examples/httpServerLogParser.py examples/idlParse.py examples/indentedGrammarExample.py examples/invRegex.py examples/jsonParser.py examples/linenoExample.py examples/list1.py examples/listAllMatches.py examples/lucene_grammar.py examples/macroExpander.py examples/makeHTMLTagExample.py examples/matchPreviousDemo.py examples/mozilla.ics examples/mozillaCalendarParser.py examples/nested.py examples/numerics.py examples/oc.py examples/parseListString.py examples/parsePythonValue.py examples/parseResultsSumExample.py examples/parseTabularData.py examples/partial_gene_match.py examples/pgn.py examples/position.py examples/protobuf_parser.py examples/pymicko.py examples/pythonGrammarParser.py examples/rangeCheck.py examples/readJson.py examples/removeLineBreaks.py examples/romanNumerals.py examples/scanExamples.py examples/scanYahoo.py examples/searchParserAppDemo.py examples/searchparser.py examples/select_parser.py examples/sexpParser.py examples/shapes.py examples/simpleArith.py examples/simpleBool.py examples/simpleSQL.py examples/simpleWiki.py examples/sparser.py examples/sql2dot.py examples/stackish.py examples/stateMachine2.py examples/test_bibparse.py examples/urlExtractor.py examples/urlExtractorNew.py examples/verilogParse.py examples/withAttribute.py examples/wordsToNum.py htmldoc/api-objects.txt htmldoc/class-tree.html htmldoc/crarr.png htmldoc/epydoc.css htmldoc/epydoc.js htmldoc/frames.html htmldoc/help.html htmldoc/identifier-index.html htmldoc/index.html htmldoc/module-tree.html htmldoc/pyparsing-module.html 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htmldoc/pyparsing.pyparsing_common-class.html htmldoc/redirect.html htmldoc/toc-everything.html htmldoc/toc-pyparsing-module.html htmldoc/toc.html pyparsing.egg-info/PKG-INFO pyparsing.egg-info/SOURCES.txt pyparsing.egg-info/dependency_links.txt pyparsing.egg-info/top_level.txtpyparsing-2.1.10/pyparsing.egg-info/top_level.txt0000666000000000000000000000001212775575712020214 0ustar 00000000000000pyparsing pyparsing-2.1.10/pyparsing.py0000666000000000000000000070075312775575401014360 0ustar 00000000000000# module pyparsing.py # # Copyright (c) 2003-2016 Paul T. McGuire # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, # distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to # the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # __doc__ = \ """ pyparsing module - Classes and methods to define and execute parsing grammars The pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. With pyparsing, you don't need to learn a new syntax for defining grammars or matching expressions - the parsing module provides a library of classes that you use to construct the grammar directly in Python. Here is a program to parse "Hello, World!" (or any greeting of the form C{", !"}), built up using L{Word}, L{Literal}, and L{And} elements (L{'+'} operator gives L{And} expressions, strings are auto-converted to L{Literal} expressions):: from pyparsing import Word, alphas # define grammar of a greeting greet = Word(alphas) + "," + Word(alphas) + "!" hello = "Hello, World!" print (hello, "->", greet.parseString(hello)) The program outputs the following:: Hello, World! -> ['Hello', ',', 'World', '!'] The Python representation of the grammar is quite readable, owing to the self-explanatory class names, and the use of '+', '|' and '^' operators. The L{ParseResults} object returned from L{ParserElement.parseString} can be accessed as a nested list, a dictionary, or an object with named attributes. The pyparsing module handles some of the problems that are typically vexing when writing text parsers: - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello , World !", etc.) - quoted strings - embedded comments """ __version__ = "2.1.10" __versionTime__ = "07 Oct 2016 01:31 UTC" __author__ = "Paul McGuire " import string from weakref import ref as wkref import copy import sys import warnings import re import sre_constants import collections import pprint import traceback import types from datetime import datetime try: from _thread import RLock except ImportError: from threading import RLock try: from collections import OrderedDict as _OrderedDict except ImportError: try: from ordereddict import OrderedDict as _OrderedDict except ImportError: _OrderedDict = None #~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) ) __all__ = [ 'And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty', 'FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal', 'MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or', 'ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException', 'ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException', 'Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter', 'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore', 'alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col', 'commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString', 'dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'hexnums', 'htmlComment', 'javaStyleComment', 'line', 'lineEnd', 'lineStart', 'lineno', 'makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral', 'nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables', 'punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity', 'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd', 'stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute', 'indentedBlock', 'originalTextFor', 'ungroup', 'infixNotation','locatedExpr', 'withClass', 'CloseMatch', 'tokenMap', 'pyparsing_common', ] system_version = tuple(sys.version_info)[:3] PY_3 = system_version[0] == 3 if PY_3: _MAX_INT = sys.maxsize basestring = str unichr = chr _ustr = str # build list of single arg builtins, that can be used as parse actions singleArgBuiltins = [sum, len, sorted, reversed, list, tuple, set, any, all, min, max] else: _MAX_INT = sys.maxint range = xrange def _ustr(obj): """Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It then < returns the unicode object | encodes it with the default encoding | ... >. """ if isinstance(obj,unicode): return obj try: # If this works, then _ustr(obj) has the same behaviour as str(obj), so # it won't break any existing code. return str(obj) except UnicodeEncodeError: # Else encode it ret = unicode(obj).encode(sys.getdefaultencoding(), 'xmlcharrefreplace') xmlcharref = Regex('&#\d+;') xmlcharref.setParseAction(lambda t: '\\u' + hex(int(t[0][2:-1]))[2:]) return xmlcharref.transformString(ret) # build list of single arg builtins, tolerant of Python version, that can be used as parse actions singleArgBuiltins = [] import __builtin__ for fname in "sum len sorted reversed list tuple set any all min max".split(): try: singleArgBuiltins.append(getattr(__builtin__,fname)) except AttributeError: continue _generatorType = type((y for y in range(1))) def _xml_escape(data): """Escape &, <, >, ", ', etc. in a string of data.""" # ampersand must be replaced first from_symbols = '&><"\'' to_symbols = ('&'+s+';' for s in "amp gt lt quot apos".split()) for from_,to_ in zip(from_symbols, to_symbols): data = data.replace(from_, to_) return data class _Constants(object): pass alphas = string.ascii_uppercase + string.ascii_lowercase nums = "0123456789" hexnums = nums + "ABCDEFabcdef" alphanums = alphas + nums _bslash = chr(92) printables = "".join(c for c in string.printable if c not in string.whitespace) class ParseBaseException(Exception): """base exception class for all parsing runtime exceptions""" # Performance tuning: we construct a *lot* of these, so keep this # constructor as small and fast as possible def __init__( self, pstr, loc=0, msg=None, elem=None ): self.loc = loc if msg is None: self.msg = pstr self.pstr = "" else: self.msg = msg self.pstr = pstr self.parserElement = elem self.args = (pstr, loc, msg) @classmethod def _from_exception(cls, pe): """ internal factory method to simplify creating one type of ParseException from another - avoids having __init__ signature conflicts among subclasses """ return cls(pe.pstr, pe.loc, pe.msg, pe.parserElement) def __getattr__( self, aname ): """supported attributes by name are: - lineno - returns the line number of the exception text - col - returns the column number of the exception text - line - returns the line containing the exception text """ if( aname == "lineno" ): return lineno( self.loc, self.pstr ) elif( aname in ("col", "column") ): return col( self.loc, self.pstr ) elif( aname == "line" ): return line( self.loc, self.pstr ) else: raise AttributeError(aname) def __str__( self ): return "%s (at char %d), (line:%d, col:%d)" % \ ( self.msg, self.loc, self.lineno, self.column ) def __repr__( self ): return _ustr(self) def markInputline( self, markerString = ">!<" ): """Extracts the exception line from the input string, and marks the location of the exception with a special symbol. """ line_str = self.line line_column = self.column - 1 if markerString: line_str = "".join((line_str[:line_column], markerString, line_str[line_column:])) return line_str.strip() def __dir__(self): return "lineno col line".split() + dir(type(self)) class ParseException(ParseBaseException): """ Exception thrown when parse expressions don't match class; supported attributes by name are: - lineno - returns the line number of the exception text - col - returns the column number of the exception text - line - returns the line containing the exception text Example:: try: Word(nums).setName("integer").parseString("ABC") except ParseException as pe: print(pe) print("column: {}".format(pe.col)) prints:: Expected integer (at char 0), (line:1, col:1) column: 1 """ pass class ParseFatalException(ParseBaseException): """user-throwable exception thrown when inconsistent parse content is found; stops all parsing immediately""" pass class ParseSyntaxException(ParseFatalException): """just like L{ParseFatalException}, but thrown internally when an L{ErrorStop} ('-' operator) indicates that parsing is to stop immediately because an unbacktrackable syntax error has been found""" pass #~ class ReparseException(ParseBaseException): #~ """Experimental class - parse actions can raise this exception to cause #~ pyparsing to reparse the input string: #~ - with a modified input string, and/or #~ - with a modified start location #~ Set the values of the ReparseException in the constructor, and raise the #~ exception in a parse action to cause pyparsing to use the new string/location. #~ Setting the values as None causes no change to be made. #~ """ #~ def __init_( self, newstring, restartLoc ): #~ self.newParseText = newstring #~ self.reparseLoc = restartLoc class RecursiveGrammarException(Exception): """exception thrown by L{ParserElement.validate} if the grammar could be improperly recursive""" def __init__( self, parseElementList ): self.parseElementTrace = parseElementList def __str__( self ): return "RecursiveGrammarException: %s" % self.parseElementTrace class _ParseResultsWithOffset(object): def __init__(self,p1,p2): self.tup = (p1,p2) def __getitem__(self,i): return self.tup[i] def __repr__(self): return repr(self.tup[0]) def setOffset(self,i): self.tup = (self.tup[0],i) class ParseResults(object): """ Structured parse results, to provide multiple means of access to the parsed data: - as a list (C{len(results)}) - by list index (C{results[0], results[1]}, etc.) - by attribute (C{results.} - see L{ParserElement.setResultsName}) Example:: integer = Word(nums) date_str = (integer.setResultsName("year") + '/' + integer.setResultsName("month") + '/' + integer.setResultsName("day")) # equivalent form: # date_str = integer("year") + '/' + integer("month") + '/' + integer("day") # parseString returns a ParseResults object result = date_str.parseString("1999/12/31") def test(s, fn=repr): print("%s -> %s" % (s, fn(eval(s)))) test("list(result)") test("result[0]") test("result['month']") test("result.day") test("'month' in result") test("'minutes' in result") test("result.dump()", str) prints:: list(result) -> ['1999', '/', '12', '/', '31'] result[0] -> '1999' result['month'] -> '12' result.day -> '31' 'month' in result -> True 'minutes' in result -> False result.dump() -> ['1999', '/', '12', '/', '31'] - day: 31 - month: 12 - year: 1999 """ def __new__(cls, toklist=None, name=None, asList=True, modal=True ): if isinstance(toklist, cls): return toklist retobj = object.__new__(cls) retobj.__doinit = True return retobj # Performance tuning: we construct a *lot* of these, so keep this # constructor as small and fast as possible def __init__( self, toklist=None, name=None, asList=True, modal=True, isinstance=isinstance ): if self.__doinit: self.__doinit = False self.__name = None self.__parent = None self.__accumNames = {} self.__asList = asList self.__modal = modal if toklist is None: toklist = [] if isinstance(toklist, list): self.__toklist = toklist[:] elif isinstance(toklist, _generatorType): self.__toklist = list(toklist) else: self.__toklist = [toklist] self.__tokdict = dict() if name is not None and name: if not modal: self.__accumNames[name] = 0 if isinstance(name,int): name = _ustr(name) # will always return a str, but use _ustr for consistency self.__name = name if not (isinstance(toklist, (type(None), basestring, list)) and toklist in (None,'',[])): if isinstance(toklist,basestring): toklist = [ toklist ] if asList: if isinstance(toklist,ParseResults): self[name] = _ParseResultsWithOffset(toklist.copy(),0) else: self[name] = _ParseResultsWithOffset(ParseResults(toklist[0]),0) self[name].__name = name else: try: self[name] = toklist[0] except (KeyError,TypeError,IndexError): self[name] = toklist def __getitem__( self, i ): if isinstance( i, (int,slice) ): return self.__toklist[i] else: if i not in self.__accumNames: return self.__tokdict[i][-1][0] else: return ParseResults([ v[0] for v in self.__tokdict[i] ]) def __setitem__( self, k, v, isinstance=isinstance ): if isinstance(v,_ParseResultsWithOffset): self.__tokdict[k] = self.__tokdict.get(k,list()) + [v] sub = v[0] elif isinstance(k,(int,slice)): self.__toklist[k] = v sub = v else: self.__tokdict[k] = self.__tokdict.get(k,list()) + [_ParseResultsWithOffset(v,0)] sub = v if isinstance(sub,ParseResults): sub.__parent = wkref(self) def __delitem__( self, i ): if isinstance(i,(int,slice)): mylen = len( self.__toklist ) del self.__toklist[i] # convert int to slice if isinstance(i, int): if i < 0: i += mylen i = slice(i, i+1) # get removed indices removed = list(range(*i.indices(mylen))) removed.reverse() # fixup indices in token dictionary for name,occurrences in self.__tokdict.items(): for j in removed: for k, (value, position) in enumerate(occurrences): occurrences[k] = _ParseResultsWithOffset(value, position - (position > j)) else: del self.__tokdict[i] def __contains__( self, k ): return k in self.__tokdict def __len__( self ): return len( self.__toklist ) def __bool__(self): return ( not not self.__toklist ) __nonzero__ = __bool__ def __iter__( self ): return iter( self.__toklist ) def __reversed__( self ): return iter( self.__toklist[::-1] ) def _iterkeys( self ): if hasattr(self.__tokdict, "iterkeys"): return self.__tokdict.iterkeys() else: return iter(self.__tokdict) def _itervalues( self ): return (self[k] for k in self._iterkeys()) def _iteritems( self ): return ((k, self[k]) for k in self._iterkeys()) if PY_3: keys = _iterkeys """Returns an iterator of all named result keys (Python 3.x only).""" values = _itervalues """Returns an iterator of all named result values (Python 3.x only).""" items = _iteritems """Returns an iterator of all named result key-value tuples (Python 3.x only).""" else: iterkeys = _iterkeys """Returns an iterator of all named result keys (Python 2.x only).""" itervalues = _itervalues """Returns an iterator of all named result values (Python 2.x only).""" iteritems = _iteritems """Returns an iterator of all named result key-value tuples (Python 2.x only).""" def keys( self ): """Returns all named result keys (as a list in Python 2.x, as an iterator in Python 3.x).""" return list(self.iterkeys()) def values( self ): """Returns all named result values (as a list in Python 2.x, as an iterator in Python 3.x).""" return list(self.itervalues()) def items( self ): """Returns all named result key-values (as a list of tuples in Python 2.x, as an iterator in Python 3.x).""" return list(self.iteritems()) def haskeys( self ): """Since keys() returns an iterator, this method is helpful in bypassing code that looks for the existence of any defined results names.""" return bool(self.__tokdict) def pop( self, *args, **kwargs): """ Removes and returns item at specified index (default=C{last}). Supports both C{list} and C{dict} semantics for C{pop()}. If passed no argument or an integer argument, it will use C{list} semantics and pop tokens from the list of parsed tokens. If passed a non-integer argument (most likely a string), it will use C{dict} semantics and pop the corresponding value from any defined results names. A second default return value argument is supported, just as in C{dict.pop()}. Example:: def remove_first(tokens): tokens.pop(0) print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321'] print(OneOrMore(Word(nums)).addParseAction(remove_first).parseString("0 123 321")) # -> ['123', '321'] label = Word(alphas) patt = label("LABEL") + OneOrMore(Word(nums)) print(patt.parseString("AAB 123 321").dump()) # Use pop() in a parse action to remove named result (note that corresponding value is not # removed from list form of results) def remove_LABEL(tokens): tokens.pop("LABEL") return tokens patt.addParseAction(remove_LABEL) print(patt.parseString("AAB 123 321").dump()) prints:: ['AAB', '123', '321'] - LABEL: AAB ['AAB', '123', '321'] """ if not args: args = [-1] for k,v in kwargs.items(): if k == 'default': args = (args[0], v) else: raise TypeError("pop() got an unexpected keyword argument '%s'" % k) if (isinstance(args[0], int) or len(args) == 1 or args[0] in self): index = args[0] ret = self[index] del self[index] return ret else: defaultvalue = args[1] return defaultvalue def get(self, key, defaultValue=None): """ Returns named result matching the given key, or if there is no such name, then returns the given C{defaultValue} or C{None} if no C{defaultValue} is specified. Similar to C{dict.get()}. Example:: integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") result = date_str.parseString("1999/12/31") print(result.get("year")) # -> '1999' print(result.get("hour", "not specified")) # -> 'not specified' print(result.get("hour")) # -> None """ if key in self: return self[key] else: return defaultValue def insert( self, index, insStr ): """ Inserts new element at location index in the list of parsed tokens. Similar to C{list.insert()}. Example:: print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321'] # use a parse action to insert the parse location in the front of the parsed results def insert_locn(locn, tokens): tokens.insert(0, locn) print(OneOrMore(Word(nums)).addParseAction(insert_locn).parseString("0 123 321")) # -> [0, '0', '123', '321'] """ self.__toklist.insert(index, insStr) # fixup indices in token dictionary for name,occurrences in self.__tokdict.items(): for k, (value, position) in enumerate(occurrences): occurrences[k] = _ParseResultsWithOffset(value, position + (position > index)) def append( self, item ): """ Add single element to end of ParseResults list of elements. Example:: print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321'] # use a parse action to compute the sum of the parsed integers, and add it to the end def append_sum(tokens): tokens.append(sum(map(int, tokens))) print(OneOrMore(Word(nums)).addParseAction(append_sum).parseString("0 123 321")) # -> ['0', '123', '321', 444] """ self.__toklist.append(item) def extend( self, itemseq ): """ Add sequence of elements to end of ParseResults list of elements. Example:: patt = OneOrMore(Word(alphas)) # use a parse action to append the reverse of the matched strings, to make a palindrome def make_palindrome(tokens): tokens.extend(reversed([t[::-1] for t in tokens])) return ''.join(tokens) print(patt.addParseAction(make_palindrome).parseString("lskdj sdlkjf lksd")) # -> 'lskdjsdlkjflksddsklfjkldsjdksl' """ if isinstance(itemseq, ParseResults): self += itemseq else: self.__toklist.extend(itemseq) def clear( self ): """ Clear all elements and results names. """ del self.__toklist[:] self.__tokdict.clear() def __getattr__( self, name ): try: return self[name] except KeyError: return "" if name in self.__tokdict: if name not in self.__accumNames: return self.__tokdict[name][-1][0] else: return ParseResults([ v[0] for v in self.__tokdict[name] ]) else: return "" def __add__( self, other ): ret = self.copy() ret += other return ret def __iadd__( self, other ): if other.__tokdict: offset = len(self.__toklist) addoffset = lambda a: offset if a<0 else a+offset otheritems = other.__tokdict.items() otherdictitems = [(k, _ParseResultsWithOffset(v[0],addoffset(v[1])) ) for (k,vlist) in otheritems for v in vlist] for k,v in otherdictitems: self[k] = v if isinstance(v[0],ParseResults): v[0].__parent = wkref(self) self.__toklist += other.__toklist self.__accumNames.update( other.__accumNames ) return self def __radd__(self, other): if isinstance(other,int) and other == 0: # useful for merging many ParseResults using sum() builtin return self.copy() else: # this may raise a TypeError - so be it return other + self def __repr__( self ): return "(%s, %s)" % ( repr( self.__toklist ), repr( self.__tokdict ) ) def __str__( self ): return '[' + ', '.join(_ustr(i) if isinstance(i, ParseResults) else repr(i) for i in self.__toklist) + ']' def _asStringList( self, sep='' ): out = [] for item in self.__toklist: if out and sep: out.append(sep) if isinstance( item, ParseResults ): out += item._asStringList() else: out.append( _ustr(item) ) return out def asList( self ): """ Returns the parse results as a nested list of matching tokens, all converted to strings. Example:: patt = OneOrMore(Word(alphas)) result = patt.parseString("sldkj lsdkj sldkj") # even though the result prints in string-like form, it is actually a pyparsing ParseResults print(type(result), result) # -> ['sldkj', 'lsdkj', 'sldkj'] # Use asList() to create an actual list result_list = result.asList() print(type(result_list), result_list) # -> ['sldkj', 'lsdkj', 'sldkj'] """ return [res.asList() if isinstance(res,ParseResults) else res for res in self.__toklist] def asDict( self ): """ Returns the named parse results as a nested dictionary. Example:: integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") result = date_str.parseString('12/31/1999') print(type(result), repr(result)) # -> (['12', '/', '31', '/', '1999'], {'day': [('1999', 4)], 'year': [('12', 0)], 'month': [('31', 2)]}) result_dict = result.asDict() print(type(result_dict), repr(result_dict)) # -> {'day': '1999', 'year': '12', 'month': '31'} # even though a ParseResults supports dict-like access, sometime you just need to have a dict import json print(json.dumps(result)) # -> Exception: TypeError: ... is not JSON serializable print(json.dumps(result.asDict())) # -> {"month": "31", "day": "1999", "year": "12"} """ if PY_3: item_fn = self.items else: item_fn = self.iteritems def toItem(obj): if isinstance(obj, ParseResults): if obj.haskeys(): return obj.asDict() else: return [toItem(v) for v in obj] else: return obj return dict((k,toItem(v)) for k,v in item_fn()) def copy( self ): """ Returns a new copy of a C{ParseResults} object. """ ret = ParseResults( self.__toklist ) ret.__tokdict = self.__tokdict.copy() ret.__parent = self.__parent ret.__accumNames.update( self.__accumNames ) ret.__name = self.__name return ret def asXML( self, doctag=None, namedItemsOnly=False, indent="", formatted=True ): """ (Deprecated) Returns the parse results as XML. Tags are created for tokens and lists that have defined results names. """ nl = "\n" out = [] namedItems = dict((v[1],k) for (k,vlist) in self.__tokdict.items() for v in vlist) nextLevelIndent = indent + " " # collapse out indents if formatting is not desired if not formatted: indent = "" nextLevelIndent = "" nl = "" selfTag = None if doctag is not None: selfTag = doctag else: if self.__name: selfTag = self.__name if not selfTag: if namedItemsOnly: return "" else: selfTag = "ITEM" out += [ nl, indent, "<", selfTag, ">" ] for i,res in enumerate(self.__toklist): if isinstance(res,ParseResults): if i in namedItems: out += [ res.asXML(namedItems[i], namedItemsOnly and doctag is None, nextLevelIndent, formatted)] else: out += [ res.asXML(None, namedItemsOnly and doctag is None, nextLevelIndent, formatted)] else: # individual token, see if there is a name for it resTag = None if i in namedItems: resTag = namedItems[i] if not resTag: if namedItemsOnly: continue else: resTag = "ITEM" xmlBodyText = _xml_escape(_ustr(res)) out += [ nl, nextLevelIndent, "<", resTag, ">", xmlBodyText, "" ] out += [ nl, indent, "" ] return "".join(out) def __lookup(self,sub): for k,vlist in self.__tokdict.items(): for v,loc in vlist: if sub is v: return k return None def getName(self): """ Returns the results name for this token expression. Useful when several different expressions might match at a particular location. Example:: integer = Word(nums) ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d") house_number_expr = Suppress('#') + Word(nums, alphanums) user_data = (Group(house_number_expr)("house_number") | Group(ssn_expr)("ssn") | Group(integer)("age")) user_info = OneOrMore(user_data) result = user_info.parseString("22 111-22-3333 #221B") for item in result: print(item.getName(), ':', item[0]) prints:: age : 22 ssn : 111-22-3333 house_number : 221B """ if self.__name: return self.__name elif self.__parent: par = self.__parent() if par: return par.__lookup(self) else: return None elif (len(self) == 1 and len(self.__tokdict) == 1 and next(iter(self.__tokdict.values()))[0][1] in (0,-1)): return next(iter(self.__tokdict.keys())) else: return None def dump(self, indent='', depth=0, full=True): """ Diagnostic method for listing out the contents of a C{ParseResults}. Accepts an optional C{indent} argument so that this string can be embedded in a nested display of other data. Example:: integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") result = date_str.parseString('12/31/1999') print(result.dump()) prints:: ['12', '/', '31', '/', '1999'] - day: 1999 - month: 31 - year: 12 """ out = [] NL = '\n' out.append( indent+_ustr(self.asList()) ) if full: if self.haskeys(): items = sorted((str(k), v) for k,v in self.items()) for k,v in items: if out: out.append(NL) out.append( "%s%s- %s: " % (indent,(' '*depth), k) ) if isinstance(v,ParseResults): if v: out.append( v.dump(indent,depth+1) ) else: out.append(_ustr(v)) else: out.append(repr(v)) elif any(isinstance(vv,ParseResults) for vv in self): v = self for i,vv in enumerate(v): if isinstance(vv,ParseResults): out.append("\n%s%s[%d]:\n%s%s%s" % (indent,(' '*(depth)),i,indent,(' '*(depth+1)),vv.dump(indent,depth+1) )) else: out.append("\n%s%s[%d]:\n%s%s%s" % (indent,(' '*(depth)),i,indent,(' '*(depth+1)),_ustr(vv))) return "".join(out) def pprint(self, *args, **kwargs): """ Pretty-printer for parsed results as a list, using the C{pprint} module. Accepts additional positional or keyword args as defined for the C{pprint.pprint} method. (U{http://docs.python.org/3/library/pprint.html#pprint.pprint}) Example:: ident = Word(alphas, alphanums) num = Word(nums) func = Forward() term = ident | num | Group('(' + func + ')') func <<= ident + Group(Optional(delimitedList(term))) result = func.parseString("fna a,b,(fnb c,d,200),100") result.pprint(width=40) prints:: ['fna', ['a', 'b', ['(', 'fnb', ['c', 'd', '200'], ')'], '100']] """ pprint.pprint(self.asList(), *args, **kwargs) # add support for pickle protocol def __getstate__(self): return ( self.__toklist, ( self.__tokdict.copy(), self.__parent is not None and self.__parent() or None, self.__accumNames, self.__name ) ) def __setstate__(self,state): self.__toklist = state[0] (self.__tokdict, par, inAccumNames, self.__name) = state[1] self.__accumNames = {} self.__accumNames.update(inAccumNames) if par is not None: self.__parent = wkref(par) else: self.__parent = None def __getnewargs__(self): return self.__toklist, self.__name, self.__asList, self.__modal def __dir__(self): return (dir(type(self)) + list(self.keys())) collections.MutableMapping.register(ParseResults) def col (loc,strg): """Returns current column within a string, counting newlines as line separators. The first column is number 1. Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See L{I{ParserElement.parseString}} for more information on parsing strings containing C{}s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ s = strg return 1 if 0} for more information on parsing strings containing C{}s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ return strg.count("\n",0,loc) + 1 def line( loc, strg ): """Returns the line of text containing loc within a string, counting newlines as line separators. """ lastCR = strg.rfind("\n", 0, loc) nextCR = strg.find("\n", loc) if nextCR >= 0: return strg[lastCR+1:nextCR] else: return strg[lastCR+1:] def _defaultStartDebugAction( instring, loc, expr ): print (("Match " + _ustr(expr) + " at loc " + _ustr(loc) + "(%d,%d)" % ( lineno(loc,instring), col(loc,instring) ))) def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ): print ("Matched " + _ustr(expr) + " -> " + str(toks.asList())) def _defaultExceptionDebugAction( instring, loc, expr, exc ): print ("Exception raised:" + _ustr(exc)) def nullDebugAction(*args): """'Do-nothing' debug action, to suppress debugging output during parsing.""" pass # Only works on Python 3.x - nonlocal is toxic to Python 2 installs #~ 'decorator to trim function calls to match the arity of the target' #~ def _trim_arity(func, maxargs=3): #~ if func in singleArgBuiltins: #~ return lambda s,l,t: func(t) #~ limit = 0 #~ foundArity = False #~ def wrapper(*args): #~ nonlocal limit,foundArity #~ while 1: #~ try: #~ ret = func(*args[limit:]) #~ foundArity = True #~ return ret #~ except TypeError: #~ if limit == maxargs or foundArity: #~ raise #~ limit += 1 #~ continue #~ return wrapper # this version is Python 2.x-3.x cross-compatible 'decorator to trim function calls to match the arity of the target' def _trim_arity(func, maxargs=2): if func in singleArgBuiltins: return lambda s,l,t: func(t) limit = [0] foundArity = [False] # traceback return data structure changed in Py3.5 - normalize back to plain tuples if system_version[:2] >= (3,5): def extract_stack(limit=0): # special handling for Python 3.5.0 - extra deep call stack by 1 offset = -3 if system_version == (3,5,0) else -2 frame_summary = traceback.extract_stack(limit=-offset+limit-1)[offset] return [(frame_summary.filename, frame_summary.lineno)] def extract_tb(tb, limit=0): frames = traceback.extract_tb(tb, limit=limit) frame_summary = frames[-1] return [(frame_summary.filename, frame_summary.lineno)] else: extract_stack = traceback.extract_stack extract_tb = traceback.extract_tb # synthesize what would be returned by traceback.extract_stack at the call to # user's parse action 'func', so that we don't incur call penalty at parse time LINE_DIFF = 6 # IF ANY CODE CHANGES, EVEN JUST COMMENTS OR BLANK LINES, BETWEEN THE NEXT LINE AND # THE CALL TO FUNC INSIDE WRAPPER, LINE_DIFF MUST BE MODIFIED!!!! this_line = extract_stack(limit=2)[-1] pa_call_line_synth = (this_line[0], this_line[1]+LINE_DIFF) def wrapper(*args): while 1: try: ret = func(*args[limit[0]:]) foundArity[0] = True return ret except TypeError: # re-raise TypeErrors if they did not come from our arity testing if foundArity[0]: raise else: try: tb = sys.exc_info()[-1] if not extract_tb(tb, limit=2)[-1][:2] == pa_call_line_synth: raise finally: del tb if limit[0] <= maxargs: limit[0] += 1 continue raise # copy func name to wrapper for sensible debug output func_name = "" try: func_name = getattr(func, '__name__', getattr(func, '__class__').__name__) except Exception: func_name = str(func) wrapper.__name__ = func_name return wrapper class ParserElement(object): """Abstract base level parser element class.""" DEFAULT_WHITE_CHARS = " \n\t\r" verbose_stacktrace = False @staticmethod def setDefaultWhitespaceChars( chars ): r""" Overrides the default whitespace chars Example:: # default whitespace chars are space, and newline OneOrMore(Word(alphas)).parseString("abc def\nghi jkl") # -> ['abc', 'def', 'ghi', 'jkl'] # change to just treat newline as significant ParserElement.setDefaultWhitespaceChars(" \t") OneOrMore(Word(alphas)).parseString("abc def\nghi jkl") # -> ['abc', 'def'] """ ParserElement.DEFAULT_WHITE_CHARS = chars @staticmethod def inlineLiteralsUsing(cls): """ Set class to be used for inclusion of string literals into a parser. Example:: # default literal class used is Literal integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") date_str.parseString("1999/12/31") # -> ['1999', '/', '12', '/', '31'] # change to Suppress ParserElement.inlineLiteralsUsing(Suppress) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") date_str.parseString("1999/12/31") # -> ['1999', '12', '31'] """ ParserElement._literalStringClass = cls def __init__( self, savelist=False ): self.parseAction = list() self.failAction = None #~ self.name = "" # don't define self.name, let subclasses try/except upcall self.strRepr = None self.resultsName = None self.saveAsList = savelist self.skipWhitespace = True self.whiteChars = ParserElement.DEFAULT_WHITE_CHARS self.copyDefaultWhiteChars = True self.mayReturnEmpty = False # used when checking for left-recursion self.keepTabs = False self.ignoreExprs = list() self.debug = False self.streamlined = False self.mayIndexError = True # used to optimize exception handling for subclasses that don't advance parse index self.errmsg = "" self.modalResults = True # used to mark results names as modal (report only last) or cumulative (list all) self.debugActions = ( None, None, None ) #custom debug actions self.re = None self.callPreparse = True # used to avoid redundant calls to preParse self.callDuringTry = False def copy( self ): """ Make a copy of this C{ParserElement}. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element. Example:: integer = Word(nums).setParseAction(lambda toks: int(toks[0])) integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K") integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M") print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M")) prints:: [5120, 100, 655360, 268435456] Equivalent form of C{expr.copy()} is just C{expr()}:: integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M") """ cpy = copy.copy( self ) cpy.parseAction = self.parseAction[:] cpy.ignoreExprs = self.ignoreExprs[:] if self.copyDefaultWhiteChars: cpy.whiteChars = ParserElement.DEFAULT_WHITE_CHARS return cpy def setName( self, name ): """ Define name for this expression, makes debugging and exception messages clearer. Example:: Word(nums).parseString("ABC") # -> Exception: Expected W:(0123...) (at char 0), (line:1, col:1) Word(nums).setName("integer").parseString("ABC") # -> Exception: Expected integer (at char 0), (line:1, col:1) """ self.name = name self.errmsg = "Expected " + self.name if hasattr(self,"exception"): self.exception.msg = self.errmsg return self def setResultsName( self, name, listAllMatches=False ): """ Define name for referencing matching tokens as a nested attribute of the returned parse results. NOTE: this returns a *copy* of the original C{ParserElement} object; this is so that the client can define a basic element, such as an integer, and reference it in multiple places with different names. You can also set results names using the abbreviated syntax, C{expr("name")} in place of C{expr.setResultsName("name")} - see L{I{__call__}<__call__>}. Example:: date_str = (integer.setResultsName("year") + '/' + integer.setResultsName("month") + '/' + integer.setResultsName("day")) # equivalent form: date_str = integer("year") + '/' + integer("month") + '/' + integer("day") """ newself = self.copy() if name.endswith("*"): name = name[:-1] listAllMatches=True newself.resultsName = name newself.modalResults = not listAllMatches return newself def setBreak(self,breakFlag = True): """Method to invoke the Python pdb debugger when this element is about to be parsed. Set C{breakFlag} to True to enable, False to disable. """ if breakFlag: _parseMethod = self._parse def breaker(instring, loc, doActions=True, callPreParse=True): import pdb pdb.set_trace() return _parseMethod( instring, loc, doActions, callPreParse ) breaker._originalParseMethod = _parseMethod self._parse = breaker else: if hasattr(self._parse,"_originalParseMethod"): self._parse = self._parse._originalParseMethod return self def setParseAction( self, *fns, **kwargs ): """ Define action to perform when successfully matching parse element definition. Parse action fn is a callable method with 0-3 arguments, called as C{fn(s,loc,toks)}, C{fn(loc,toks)}, C{fn(toks)}, or just C{fn()}, where: - s = the original string being parsed (see note below) - loc = the location of the matching substring - toks = a list of the matched tokens, packaged as a C{L{ParseResults}} object If the functions in fns modify the tokens, they can return them as the return value from fn, and the modified list of tokens will replace the original. Otherwise, fn does not need to return any value. Optional keyword arguments: - callDuringTry = (default=C{False}) indicate if parse action should be run during lookaheads and alternate testing Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See L{I{parseString}} for more information on parsing strings containing C{}s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. Example:: integer = Word(nums) date_str = integer + '/' + integer + '/' + integer date_str.parseString("1999/12/31") # -> ['1999', '/', '12', '/', '31'] # use parse action to convert to ints at parse time integer = Word(nums).setParseAction(lambda toks: int(toks[0])) date_str = integer + '/' + integer + '/' + integer # note that integer fields are now ints, not strings date_str.parseString("1999/12/31") # -> [1999, '/', 12, '/', 31] """ self.parseAction = list(map(_trim_arity, list(fns))) self.callDuringTry = kwargs.get("callDuringTry", False) return self def addParseAction( self, *fns, **kwargs ): """ Add parse action to expression's list of parse actions. See L{I{setParseAction}}. See examples in L{I{copy}}. """ self.parseAction += list(map(_trim_arity, list(fns))) self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False) return self def addCondition(self, *fns, **kwargs): """Add a boolean predicate function to expression's list of parse actions. See L{I{setParseAction}} for function call signatures. Unlike C{setParseAction}, functions passed to C{addCondition} need to return boolean success/fail of the condition. Optional keyword arguments: - message = define a custom message to be used in the raised exception - fatal = if True, will raise ParseFatalException to stop parsing immediately; otherwise will raise ParseException Example:: integer = Word(nums).setParseAction(lambda toks: int(toks[0])) year_int = integer.copy() year_int.addCondition(lambda toks: toks[0] >= 2000, message="Only support years 2000 and later") date_str = year_int + '/' + integer + '/' + integer result = date_str.parseString("1999/12/31") # -> Exception: Only support years 2000 and later (at char 0), (line:1, col:1) """ msg = kwargs.get("message", "failed user-defined condition") exc_type = ParseFatalException if kwargs.get("fatal", False) else ParseException for fn in fns: def pa(s,l,t): if not bool(_trim_arity(fn)(s,l,t)): raise exc_type(s,l,msg) self.parseAction.append(pa) self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False) return self def setFailAction( self, fn ): """Define action to perform if parsing fails at this expression. Fail acton fn is a callable function that takes the arguments C{fn(s,loc,expr,err)} where: - s = string being parsed - loc = location where expression match was attempted and failed - expr = the parse expression that failed - err = the exception thrown The function returns no value. It may throw C{L{ParseFatalException}} if it is desired to stop parsing immediately.""" self.failAction = fn return self def _skipIgnorables( self, instring, loc ): exprsFound = True while exprsFound: exprsFound = False for e in self.ignoreExprs: try: while 1: loc,dummy = e._parse( instring, loc ) exprsFound = True except ParseException: pass return loc def preParse( self, instring, loc ): if self.ignoreExprs: loc = self._skipIgnorables( instring, loc ) if self.skipWhitespace: wt = self.whiteChars instrlen = len(instring) while loc < instrlen and instring[loc] in wt: loc += 1 return loc def parseImpl( self, instring, loc, doActions=True ): return loc, [] def postParse( self, instring, loc, tokenlist ): return tokenlist #~ @profile def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ): debugging = ( self.debug ) #and doActions ) if debugging or self.failAction: #~ print ("Match",self,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )) if (self.debugActions[0] ): self.debugActions[0]( instring, loc, self ) if callPreParse and self.callPreparse: preloc = self.preParse( instring, loc ) else: preloc = loc tokensStart = preloc try: try: loc,tokens = self.parseImpl( instring, preloc, doActions ) except IndexError: raise ParseException( instring, len(instring), self.errmsg, self ) except ParseBaseException as err: #~ print ("Exception raised:", err) if self.debugActions[2]: self.debugActions[2]( instring, tokensStart, self, err ) if self.failAction: self.failAction( instring, tokensStart, self, err ) raise else: if callPreParse and self.callPreparse: preloc = self.preParse( instring, loc ) else: preloc = loc tokensStart = preloc if self.mayIndexError or loc >= len(instring): try: loc,tokens = self.parseImpl( instring, preloc, doActions ) except IndexError: raise ParseException( instring, len(instring), self.errmsg, self ) else: loc,tokens = self.parseImpl( instring, preloc, doActions ) tokens = self.postParse( instring, loc, tokens ) retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults ) if self.parseAction and (doActions or self.callDuringTry): if debugging: try: for fn in self.parseAction: tokens = fn( instring, tokensStart, retTokens ) if tokens is not None: retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList and isinstance(tokens,(ParseResults,list)), modal=self.modalResults ) except ParseBaseException as err: #~ print "Exception raised in user parse action:", err if (self.debugActions[2] ): self.debugActions[2]( instring, tokensStart, self, err ) raise else: for fn in self.parseAction: tokens = fn( instring, tokensStart, retTokens ) if tokens is not None: retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList and isinstance(tokens,(ParseResults,list)), modal=self.modalResults ) if debugging: #~ print ("Matched",self,"->",retTokens.asList()) if (self.debugActions[1] ): self.debugActions[1]( instring, tokensStart, loc, self, retTokens ) return loc, retTokens def tryParse( self, instring, loc ): try: return self._parse( instring, loc, doActions=False )[0] except ParseFatalException: raise ParseException( instring, loc, self.errmsg, self) def canParseNext(self, instring, loc): try: self.tryParse(instring, loc) except (ParseException, IndexError): return False else: return True class _UnboundedCache(object): def __init__(self): cache = {} self.not_in_cache = not_in_cache = object() def get(self, key): return cache.get(key, not_in_cache) def set(self, key, value): cache[key] = value def clear(self): cache.clear() self.get = types.MethodType(get, self) self.set = types.MethodType(set, self) self.clear = types.MethodType(clear, self) if _OrderedDict is not None: class _FifoCache(object): def __init__(self, size): self.not_in_cache = not_in_cache = object() cache = _OrderedDict() def get(self, key): return cache.get(key, not_in_cache) def set(self, key, value): cache[key] = value if len(cache) > size: cache.popitem(False) def clear(self): cache.clear() self.get = types.MethodType(get, self) self.set = types.MethodType(set, self) self.clear = types.MethodType(clear, self) else: class _FifoCache(object): def __init__(self, size): self.not_in_cache = not_in_cache = object() cache = {} key_fifo = collections.deque([], size) def get(self, key): return cache.get(key, not_in_cache) def set(self, key, value): cache[key] = value if len(cache) > size: cache.pop(key_fifo.popleft(), None) key_fifo.append(key) def clear(self): cache.clear() key_fifo.clear() self.get = types.MethodType(get, self) self.set = types.MethodType(set, self) self.clear = types.MethodType(clear, self) # argument cache for optimizing repeated calls when backtracking through recursive expressions packrat_cache = {} # this is set later by enabledPackrat(); this is here so that resetCache() doesn't fail packrat_cache_lock = RLock() packrat_cache_stats = [0, 0] # this method gets repeatedly called during backtracking with the same arguments - # we can cache these arguments and save ourselves the trouble of re-parsing the contained expression def _parseCache( self, instring, loc, doActions=True, callPreParse=True ): HIT, MISS = 0, 1 lookup = (self, instring, loc, callPreParse, doActions) with ParserElement.packrat_cache_lock: cache = ParserElement.packrat_cache value = cache.get(lookup) if value is cache.not_in_cache: ParserElement.packrat_cache_stats[MISS] += 1 try: value = self._parseNoCache(instring, loc, doActions, callPreParse) except ParseBaseException as pe: # cache a copy of the exception, without the traceback cache.set(lookup, pe.__class__(*pe.args)) raise else: cache.set(lookup, (value[0], value[1].copy())) return value else: ParserElement.packrat_cache_stats[HIT] += 1 if isinstance(value, Exception): raise value return (value[0], value[1].copy()) _parse = _parseNoCache @staticmethod def resetCache(): ParserElement.packrat_cache.clear() ParserElement.packrat_cache_stats[:] = [0] * len(ParserElement.packrat_cache_stats) _packratEnabled = False @staticmethod def enablePackrat(cache_size_limit=128): """Enables "packrat" parsing, which adds memoizing to the parsing logic. Repeated parse attempts at the same string location (which happens often in many complex grammars) can immediately return a cached value, instead of re-executing parsing/validating code. Memoizing is done of both valid results and parsing exceptions. Parameters: - cache_size_limit - (default=C{128}) - if an integer value is provided will limit the size of the packrat cache; if None is passed, then the cache size will be unbounded; if 0 is passed, the cache will be effectively disabled. This speedup may break existing programs that use parse actions that have side-effects. For this reason, packrat parsing is disabled when you first import pyparsing. To activate the packrat feature, your program must call the class method C{ParserElement.enablePackrat()}. If your program uses C{psyco} to "compile as you go", you must call C{enablePackrat} before calling C{psyco.full()}. If you do not do this, Python will crash. For best results, call C{enablePackrat()} immediately after importing pyparsing. Example:: import pyparsing pyparsing.ParserElement.enablePackrat() """ if not ParserElement._packratEnabled: ParserElement._packratEnabled = True if cache_size_limit is None: ParserElement.packrat_cache = ParserElement._UnboundedCache() else: ParserElement.packrat_cache = ParserElement._FifoCache(cache_size_limit) ParserElement._parse = ParserElement._parseCache def parseString( self, instring, parseAll=False ): """ Execute the parse expression with the given string. This is the main interface to the client code, once the complete expression has been built. If you want the grammar to require that the entire input string be successfully parsed, then set C{parseAll} to True (equivalent to ending the grammar with C{L{StringEnd()}}). Note: C{parseString} implicitly calls C{expandtabs()} on the input string, in order to report proper column numbers in parse actions. If the input string contains tabs and the grammar uses parse actions that use the C{loc} argument to index into the string being parsed, you can ensure you have a consistent view of the input string by: - calling C{parseWithTabs} on your grammar before calling C{parseString} (see L{I{parseWithTabs}}) - define your parse action using the full C{(s,loc,toks)} signature, and reference the input string using the parse action's C{s} argument - explictly expand the tabs in your input string before calling C{parseString} Example:: Word('a').parseString('aaaaabaaa') # -> ['aaaaa'] Word('a').parseString('aaaaabaaa', parseAll=True) # -> Exception: Expected end of text """ ParserElement.resetCache() if not self.streamlined: self.streamline() #~ self.saveAsList = True for e in self.ignoreExprs: e.streamline() if not self.keepTabs: instring = instring.expandtabs() try: loc, tokens = self._parse( instring, 0 ) if parseAll: loc = self.preParse( instring, loc ) se = Empty() + StringEnd() se._parse( instring, loc ) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc else: return tokens def scanString( self, instring, maxMatches=_MAX_INT, overlap=False ): """ Scan the input string for expression matches. Each match will return the matching tokens, start location, and end location. May be called with optional C{maxMatches} argument, to clip scanning after 'n' matches are found. If C{overlap} is specified, then overlapping matches will be reported. Note that the start and end locations are reported relative to the string being parsed. See L{I{parseString}} for more information on parsing strings with embedded tabs. Example:: source = "sldjf123lsdjjkf345sldkjf879lkjsfd987" print(source) for tokens,start,end in Word(alphas).scanString(source): print(' '*start + '^'*(end-start)) print(' '*start + tokens[0]) prints:: sldjf123lsdjjkf345sldkjf879lkjsfd987 ^^^^^ sldjf ^^^^^^^ lsdjjkf ^^^^^^ sldkjf ^^^^^^ lkjsfd """ if not self.streamlined: self.streamline() for e in self.ignoreExprs: e.streamline() if not self.keepTabs: instring = _ustr(instring).expandtabs() instrlen = len(instring) loc = 0 preparseFn = self.preParse parseFn = self._parse ParserElement.resetCache() matches = 0 try: while loc <= instrlen and matches < maxMatches: try: preloc = preparseFn( instring, loc ) nextLoc,tokens = parseFn( instring, preloc, callPreParse=False ) except ParseException: loc = preloc+1 else: if nextLoc > loc: matches += 1 yield tokens, preloc, nextLoc if overlap: nextloc = preparseFn( instring, loc ) if nextloc > loc: loc = nextLoc else: loc += 1 else: loc = nextLoc else: loc = preloc+1 except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def transformString( self, instring ): """ Extension to C{L{scanString}}, to modify matching text with modified tokens that may be returned from a parse action. To use C{transformString}, define a grammar and attach a parse action to it that modifies the returned token list. Invoking C{transformString()} on a target string will then scan for matches, and replace the matched text patterns according to the logic in the parse action. C{transformString()} returns the resulting transformed string. Example:: wd = Word(alphas) wd.setParseAction(lambda toks: toks[0].title()) print(wd.transformString("now is the winter of our discontent made glorious summer by this sun of york.")) Prints:: Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York. """ out = [] lastE = 0 # force preservation of s, to minimize unwanted transformation of string, and to # keep string locs straight between transformString and scanString self.keepTabs = True try: for t,s,e in self.scanString( instring ): out.append( instring[lastE:s] ) if t: if isinstance(t,ParseResults): out += t.asList() elif isinstance(t,list): out += t else: out.append(t) lastE = e out.append(instring[lastE:]) out = [o for o in out if o] return "".join(map(_ustr,_flatten(out))) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def searchString( self, instring, maxMatches=_MAX_INT ): """ Another extension to C{L{scanString}}, simplifying the access to the tokens found to match the given parse expression. May be called with optional C{maxMatches} argument, to clip searching after 'n' matches are found. Example:: # a capitalized word starts with an uppercase letter, followed by zero or more lowercase letters cap_word = Word(alphas.upper(), alphas.lower()) print(cap_word.searchString("More than Iron, more than Lead, more than Gold I need Electricity")) prints:: ['More', 'Iron', 'Lead', 'Gold', 'I'] """ try: return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ]) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def split(self, instring, maxsplit=_MAX_INT, includeSeparators=False): """ Generator method to split a string using the given expression as a separator. May be called with optional C{maxsplit} argument, to limit the number of splits; and the optional C{includeSeparators} argument (default=C{False}), if the separating matching text should be included in the split results. Example:: punc = oneOf(list(".,;:/-!?")) print(list(punc.split("This, this?, this sentence, is badly punctuated!"))) prints:: ['This', ' this', '', ' this sentence', ' is badly punctuated', ''] """ splits = 0 last = 0 for t,s,e in self.scanString(instring, maxMatches=maxsplit): yield instring[last:s] if includeSeparators: yield t[0] last = e yield instring[last:] def __add__(self, other ): """ Implementation of + operator - returns C{L{And}}. Adding strings to a ParserElement converts them to L{Literal}s by default. Example:: greet = Word(alphas) + "," + Word(alphas) + "!" hello = "Hello, World!" print (hello, "->", greet.parseString(hello)) Prints:: Hello, World! -> ['Hello', ',', 'World', '!'] """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return And( [ self, other ] ) def __radd__(self, other ): """ Implementation of + operator when left operand is not a C{L{ParserElement}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other + self def __sub__(self, other): """ Implementation of - operator, returns C{L{And}} with error stop """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return And( [ self, And._ErrorStop(), other ] ) def __rsub__(self, other ): """ Implementation of - operator when left operand is not a C{L{ParserElement}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other - self def __mul__(self,other): """ Implementation of * operator, allows use of C{expr * 3} in place of C{expr + expr + expr}. Expressions may also me multiplied by a 2-integer tuple, similar to C{{min,max}} multipliers in regular expressions. Tuples may also include C{None} as in: - C{expr*(n,None)} or C{expr*(n,)} is equivalent to C{expr*n + L{ZeroOrMore}(expr)} (read as "at least n instances of C{expr}") - C{expr*(None,n)} is equivalent to C{expr*(0,n)} (read as "0 to n instances of C{expr}") - C{expr*(None,None)} is equivalent to C{L{ZeroOrMore}(expr)} - C{expr*(1,None)} is equivalent to C{L{OneOrMore}(expr)} Note that C{expr*(None,n)} does not raise an exception if more than n exprs exist in the input stream; that is, C{expr*(None,n)} does not enforce a maximum number of expr occurrences. If this behavior is desired, then write C{expr*(None,n) + ~expr} """ if isinstance(other,int): minElements, optElements = other,0 elif isinstance(other,tuple): other = (other + (None, None))[:2] if other[0] is None: other = (0, other[1]) if isinstance(other[0],int) and other[1] is None: if other[0] == 0: return ZeroOrMore(self) if other[0] == 1: return OneOrMore(self) else: return self*other[0] + ZeroOrMore(self) elif isinstance(other[0],int) and isinstance(other[1],int): minElements, optElements = other optElements -= minElements else: raise TypeError("cannot multiply 'ParserElement' and ('%s','%s') objects", type(other[0]),type(other[1])) else: raise TypeError("cannot multiply 'ParserElement' and '%s' objects", type(other)) if minElements < 0: raise ValueError("cannot multiply ParserElement by negative value") if optElements < 0: raise ValueError("second tuple value must be greater or equal to first tuple value") if minElements == optElements == 0: raise ValueError("cannot multiply ParserElement by 0 or (0,0)") if (optElements): def makeOptionalList(n): if n>1: return Optional(self + makeOptionalList(n-1)) else: return Optional(self) if minElements: if minElements == 1: ret = self + makeOptionalList(optElements) else: ret = And([self]*minElements) + makeOptionalList(optElements) else: ret = makeOptionalList(optElements) else: if minElements == 1: ret = self else: ret = And([self]*minElements) return ret def __rmul__(self, other): return self.__mul__(other) def __or__(self, other ): """ Implementation of | operator - returns C{L{MatchFirst}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return MatchFirst( [ self, other ] ) def __ror__(self, other ): """ Implementation of | operator when left operand is not a C{L{ParserElement}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other | self def __xor__(self, other ): """ Implementation of ^ operator - returns C{L{Or}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return Or( [ self, other ] ) def __rxor__(self, other ): """ Implementation of ^ operator when left operand is not a C{L{ParserElement}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other ^ self def __and__(self, other ): """ Implementation of & operator - returns C{L{Each}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return Each( [ self, other ] ) def __rand__(self, other ): """ Implementation of & operator when left operand is not a C{L{ParserElement}} """ if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other & self def __invert__( self ): """ Implementation of ~ operator - returns C{L{NotAny}} """ return NotAny( self ) def __call__(self, name=None): """ Shortcut for C{L{setResultsName}}, with C{listAllMatches=False}. If C{name} is given with a trailing C{'*'} character, then C{listAllMatches} will be passed as C{True}. If C{name} is omitted, same as calling C{L{copy}}. Example:: # these are equivalent userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno") userdata = Word(alphas)("name") + Word(nums+"-")("socsecno") """ if name is not None: return self.setResultsName(name) else: return self.copy() def suppress( self ): """ Suppresses the output of this C{ParserElement}; useful to keep punctuation from cluttering up returned output. """ return Suppress( self ) def leaveWhitespace( self ): """ Disables the skipping of whitespace before matching the characters in the C{ParserElement}'s defined pattern. This is normally only used internally by the pyparsing module, but may be needed in some whitespace-sensitive grammars. """ self.skipWhitespace = False return self def setWhitespaceChars( self, chars ): """ Overrides the default whitespace chars """ self.skipWhitespace = True self.whiteChars = chars self.copyDefaultWhiteChars = False return self def parseWithTabs( self ): """ Overrides default behavior to expand C{}s to spaces before parsing the input string. Must be called before C{parseString} when the input grammar contains elements that match C{} characters. """ self.keepTabs = True return self def ignore( self, other ): """ Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns. Example:: patt = OneOrMore(Word(alphas)) patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj'] patt.ignore(cStyleComment) patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd'] """ if isinstance(other, basestring): other = Suppress(other) if isinstance( other, Suppress ): if other not in self.ignoreExprs: self.ignoreExprs.append(other) else: self.ignoreExprs.append( Suppress( other.copy() ) ) return self def setDebugActions( self, startAction, successAction, exceptionAction ): """ Enable display of debugging messages while doing pattern matching. """ self.debugActions = (startAction or _defaultStartDebugAction, successAction or _defaultSuccessDebugAction, exceptionAction or _defaultExceptionDebugAction) self.debug = True return self def setDebug( self, flag=True ): """ Enable display of debugging messages while doing pattern matching. Set C{flag} to True to enable, False to disable. Example:: wd = Word(alphas).setName("alphaword") integer = Word(nums).setName("numword") term = wd | integer # turn on debugging for wd wd.setDebug() OneOrMore(term).parseString("abc 123 xyz 890") prints:: Match alphaword at loc 0(1,1) Matched alphaword -> ['abc'] Match alphaword at loc 3(1,4) Exception raised:Expected alphaword (at char 4), (line:1, col:5) Match alphaword at loc 7(1,8) Matched alphaword -> ['xyz'] Match alphaword at loc 11(1,12) Exception raised:Expected alphaword (at char 12), (line:1, col:13) Match alphaword at loc 15(1,16) Exception raised:Expected alphaword (at char 15), (line:1, col:16) The output shown is that produced by the default debug actions - custom debug actions can be specified using L{setDebugActions}. Prior to attempting to match the C{wd} expression, the debugging message C{"Match at loc (,)"} is shown. Then if the parse succeeds, a C{"Matched"} message is shown, or an C{"Exception raised"} message is shown. Also note the use of L{setName} to assign a human-readable name to the expression, which makes debugging and exception messages easier to understand - for instance, the default name created for the C{Word} expression without calling C{setName} is C{"W:(ABCD...)"}. """ if flag: self.setDebugActions( _defaultStartDebugAction, _defaultSuccessDebugAction, _defaultExceptionDebugAction ) else: self.debug = False return self def __str__( self ): return self.name def __repr__( self ): return _ustr(self) def streamline( self ): self.streamlined = True self.strRepr = None return self def checkRecursion( self, parseElementList ): pass def validate( self, validateTrace=[] ): """ Check defined expressions for valid structure, check for infinite recursive definitions. """ self.checkRecursion( [] ) def parseFile( self, file_or_filename, parseAll=False ): """ Execute the parse expression on the given file or filename. If a filename is specified (instead of a file object), the entire file is opened, read, and closed before parsing. """ try: file_contents = file_or_filename.read() except AttributeError: with open(file_or_filename, "r") as f: file_contents = f.read() try: return self.parseString(file_contents, parseAll) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def __eq__(self,other): if isinstance(other, ParserElement): return self is other or vars(self) == vars(other) elif isinstance(other, basestring): return self.matches(other) else: return super(ParserElement,self)==other def __ne__(self,other): return not (self == other) def __hash__(self): return hash(id(self)) def __req__(self,other): return self == other def __rne__(self,other): return not (self == other) def matches(self, testString, parseAll=True): """ Method for quick testing of a parser against a test string. Good for simple inline microtests of sub expressions while building up larger parser. Parameters: - testString - to test against this expression for a match - parseAll - (default=C{True}) - flag to pass to C{L{parseString}} when running tests Example:: expr = Word(nums) assert expr.matches("100") """ try: self.parseString(_ustr(testString), parseAll=parseAll) return True except ParseBaseException: return False def runTests(self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False): """ Execute the parse expression on a series of test strings, showing each test, the parsed results or where the parse failed. Quick and easy way to run a parse expression against a list of sample strings. Parameters: - tests - a list of separate test strings, or a multiline string of test strings - parseAll - (default=C{True}) - flag to pass to C{L{parseString}} when running tests - comment - (default=C{'#'}) - expression for indicating embedded comments in the test string; pass None to disable comment filtering - fullDump - (default=C{True}) - dump results as list followed by results names in nested outline; if False, only dump nested list - printResults - (default=C{True}) prints test output to stdout - failureTests - (default=C{False}) indicates if these tests are expected to fail parsing Returns: a (success, results) tuple, where success indicates that all tests succeeded (or failed if C{failureTests} is True), and the results contain a list of lines of each test's output Example:: number_expr = pyparsing_common.number.copy() result = number_expr.runTests(''' # unsigned integer 100 # negative integer -100 # float with scientific notation 6.02e23 # integer with scientific notation 1e-12 ''') print("Success" if result[0] else "Failed!") result = number_expr.runTests(''' # stray character 100Z # missing leading digit before '.' -.100 # too many '.' 3.14.159 ''', failureTests=True) print("Success" if result[0] else "Failed!") prints:: # unsigned integer 100 [100] # negative integer -100 [-100] # float with scientific notation 6.02e23 [6.02e+23] # integer with scientific notation 1e-12 [1e-12] Success # stray character 100Z ^ FAIL: Expected end of text (at char 3), (line:1, col:4) # missing leading digit before '.' -.100 ^ FAIL: Expected {real number with scientific notation | real number | signed integer} (at char 0), (line:1, col:1) # too many '.' 3.14.159 ^ FAIL: Expected end of text (at char 4), (line:1, col:5) Success Each test string must be on a single line. If you want to test a string that spans multiple lines, create a test like this:: expr.runTest(r"this is a test\\n of strings that spans \\n 3 lines") (Note that this is a raw string literal, you must include the leading 'r'.) """ if isinstance(tests, basestring): tests = list(map(str.strip, tests.rstrip().splitlines())) if isinstance(comment, basestring): comment = Literal(comment) allResults = [] comments = [] success = True for t in tests: if comment is not None and comment.matches(t, False) or comments and not t: comments.append(t) continue if not t: continue out = ['\n'.join(comments), t] comments = [] try: t = t.replace(r'\n','\n') result = self.parseString(t, parseAll=parseAll) out.append(result.dump(full=fullDump)) success = success and not failureTests except ParseBaseException as pe: fatal = "(FATAL)" if isinstance(pe, ParseFatalException) else "" if '\n' in t: out.append(line(pe.loc, t)) out.append(' '*(col(pe.loc,t)-1) + '^' + fatal) else: out.append(' '*pe.loc + '^' + fatal) out.append("FAIL: " + str(pe)) success = success and failureTests result = pe except Exception as exc: out.append("FAIL-EXCEPTION: " + str(exc)) success = success and failureTests result = exc if printResults: if fullDump: out.append('') print('\n'.join(out)) allResults.append((t, result)) return success, allResults class Token(ParserElement): """ Abstract C{ParserElement} subclass, for defining atomic matching patterns. """ def __init__( self ): super(Token,self).__init__( savelist=False ) class Empty(Token): """ An empty token, will always match. """ def __init__( self ): super(Empty,self).__init__() self.name = "Empty" self.mayReturnEmpty = True self.mayIndexError = False class NoMatch(Token): """ A token that will never match. """ def __init__( self ): super(NoMatch,self).__init__() self.name = "NoMatch" self.mayReturnEmpty = True self.mayIndexError = False self.errmsg = "Unmatchable token" def parseImpl( self, instring, loc, doActions=True ): raise ParseException(instring, loc, self.errmsg, self) class Literal(Token): """ Token to exactly match a specified string. Example:: Literal('blah').parseString('blah') # -> ['blah'] Literal('blah').parseString('blahfooblah') # -> ['blah'] Literal('blah').parseString('bla') # -> Exception: Expected "blah" For case-insensitive matching, use L{CaselessLiteral}. For keyword matching (force word break before and after the matched string), use L{Keyword} or L{CaselessKeyword}. """ def __init__( self, matchString ): super(Literal,self).__init__() self.match = matchString self.matchLen = len(matchString) try: self.firstMatchChar = matchString[0] except IndexError: warnings.warn("null string passed to Literal; use Empty() instead", SyntaxWarning, stacklevel=2) self.__class__ = Empty self.name = '"%s"' % _ustr(self.match) self.errmsg = "Expected " + self.name self.mayReturnEmpty = False self.mayIndexError = False # Performance tuning: this routine gets called a *lot* # if this is a single character match string and the first character matches, # short-circuit as quickly as possible, and avoid calling startswith #~ @profile def parseImpl( self, instring, loc, doActions=True ): if (instring[loc] == self.firstMatchChar and (self.matchLen==1 or instring.startswith(self.match,loc)) ): return loc+self.matchLen, self.match raise ParseException(instring, loc, self.errmsg, self) _L = Literal ParserElement._literalStringClass = Literal class Keyword(Token): """ Token to exactly match a specified string as a keyword, that is, it must be immediately followed by a non-keyword character. Compare with C{L{Literal}}: - C{Literal("if")} will match the leading C{'if'} in C{'ifAndOnlyIf'}. - C{Keyword("if")} will not; it will only match the leading C{'if'} in C{'if x=1'}, or C{'if(y==2)'} Accepts two optional constructor arguments in addition to the keyword string: - C{identChars} is a string of characters that would be valid identifier characters, defaulting to all alphanumerics + "_" and "$" - C{caseless} allows case-insensitive matching, default is C{False}. Example:: Keyword("start").parseString("start") # -> ['start'] Keyword("start").parseString("starting") # -> Exception For case-insensitive matching, use L{CaselessKeyword}. """ DEFAULT_KEYWORD_CHARS = alphanums+"_$" def __init__( self, matchString, identChars=None, caseless=False ): super(Keyword,self).__init__() if identChars is None: identChars = Keyword.DEFAULT_KEYWORD_CHARS self.match = matchString self.matchLen = len(matchString) try: self.firstMatchChar = matchString[0] except IndexError: warnings.warn("null string passed to Keyword; use Empty() instead", SyntaxWarning, stacklevel=2) self.name = '"%s"' % self.match self.errmsg = "Expected " + self.name self.mayReturnEmpty = False self.mayIndexError = False self.caseless = caseless if caseless: self.caselessmatch = matchString.upper() identChars = identChars.upper() self.identChars = set(identChars) def parseImpl( self, instring, loc, doActions=True ): if self.caseless: if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) and (loc == 0 or instring[loc-1].upper() not in self.identChars) ): return loc+self.matchLen, self.match else: if (instring[loc] == self.firstMatchChar and (self.matchLen==1 or instring.startswith(self.match,loc)) and (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen] not in self.identChars) and (loc == 0 or instring[loc-1] not in self.identChars) ): return loc+self.matchLen, self.match raise ParseException(instring, loc, self.errmsg, self) def copy(self): c = super(Keyword,self).copy() c.identChars = Keyword.DEFAULT_KEYWORD_CHARS return c @staticmethod def setDefaultKeywordChars( chars ): """Overrides the default Keyword chars """ Keyword.DEFAULT_KEYWORD_CHARS = chars class CaselessLiteral(Literal): """ Token to match a specified string, ignoring case of letters. Note: the matched results will always be in the case of the given match string, NOT the case of the input text. Example:: OneOrMore(CaselessLiteral("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD', 'CMD'] (Contrast with example for L{CaselessKeyword}.) """ def __init__( self, matchString ): super(CaselessLiteral,self).__init__( matchString.upper() ) # Preserve the defining literal. self.returnString = matchString self.name = "'%s'" % self.returnString self.errmsg = "Expected " + self.name def parseImpl( self, instring, loc, doActions=True ): if instring[ loc:loc+self.matchLen ].upper() == self.match: return loc+self.matchLen, self.returnString raise ParseException(instring, loc, self.errmsg, self) class CaselessKeyword(Keyword): """ Caseless version of L{Keyword}. Example:: OneOrMore(CaselessKeyword("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD'] (Contrast with example for L{CaselessLiteral}.) """ def __init__( self, matchString, identChars=None ): super(CaselessKeyword,self).__init__( matchString, identChars, caseless=True ) def parseImpl( self, instring, loc, doActions=True ): if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) ): return loc+self.matchLen, self.match raise ParseException(instring, loc, self.errmsg, self) class CloseMatch(Token): """ A variation on L{Literal} which matches "close" matches, that is, strings with at most 'n' mismatching characters. C{CloseMatch} takes parameters: - C{match_string} - string to be matched - C{maxMismatches} - (C{default=1}) maximum number of mismatches allowed to count as a match The results from a successful parse will contain the matched text from the input string and the following named results: - C{mismatches} - a list of the positions within the match_string where mismatches were found - C{original} - the original match_string used to compare against the input string If C{mismatches} is an empty list, then the match was an exact match. Example:: patt = CloseMatch("ATCATCGAATGGA") patt.parseString("ATCATCGAAXGGA") # -> (['ATCATCGAAXGGA'], {'mismatches': [[9]], 'original': ['ATCATCGAATGGA']}) patt.parseString("ATCAXCGAAXGGA") # -> Exception: Expected 'ATCATCGAATGGA' (with up to 1 mismatches) (at char 0), (line:1, col:1) # exact match patt.parseString("ATCATCGAATGGA") # -> (['ATCATCGAATGGA'], {'mismatches': [[]], 'original': ['ATCATCGAATGGA']}) # close match allowing up to 2 mismatches patt = CloseMatch("ATCATCGAATGGA", maxMismatches=2) patt.parseString("ATCAXCGAAXGGA") # -> (['ATCAXCGAAXGGA'], {'mismatches': [[4, 9]], 'original': ['ATCATCGAATGGA']}) """ def __init__(self, match_string, maxMismatches=1): super(CloseMatch,self).__init__() self.name = match_string self.match_string = match_string self.maxMismatches = maxMismatches self.errmsg = "Expected %r (with up to %d mismatches)" % (self.match_string, self.maxMismatches) self.mayIndexError = False self.mayReturnEmpty = False def parseImpl( self, instring, loc, doActions=True ): start = loc instrlen = len(instring) maxloc = start + len(self.match_string) if maxloc <= instrlen: match_string = self.match_string match_stringloc = 0 mismatches = [] maxMismatches = self.maxMismatches for match_stringloc,s_m in enumerate(zip(instring[loc:maxloc], self.match_string)): src,mat = s_m if src != mat: mismatches.append(match_stringloc) if len(mismatches) > maxMismatches: break else: loc = match_stringloc + 1 results = ParseResults([instring[start:loc]]) results['original'] = self.match_string results['mismatches'] = mismatches return loc, results raise ParseException(instring, loc, self.errmsg, self) class Word(Token): """ Token for matching words composed of allowed character sets. Defined with string containing all allowed initial characters, an optional string containing allowed body characters (if omitted, defaults to the initial character set), and an optional minimum, maximum, and/or exact length. The default value for C{min} is 1 (a minimum value < 1 is not valid); the default values for C{max} and C{exact} are 0, meaning no maximum or exact length restriction. An optional C{excludeChars} parameter can list characters that might be found in the input C{bodyChars} string; useful to define a word of all printables except for one or two characters, for instance. L{srange} is useful for defining custom character set strings for defining C{Word} expressions, using range notation from regular expression character sets. A common mistake is to use C{Word} to match a specific literal string, as in C{Word("Address")}. Remember that C{Word} uses the string argument to define I{sets} of matchable characters. This expression would match "Add", "AAA", "dAred", or any other word made up of the characters 'A', 'd', 'r', 'e', and 's'. To match an exact literal string, use L{Literal} or L{Keyword}. pyparsing includes helper strings for building Words: - L{alphas} - L{nums} - L{alphanums} - L{hexnums} - L{alphas8bit} (alphabetic characters in ASCII range 128-255 - accented, tilded, umlauted, etc.) - L{punc8bit} (non-alphabetic characters in ASCII range 128-255 - currency, symbols, superscripts, diacriticals, etc.) - L{printables} (any non-whitespace character) Example:: # a word composed of digits integer = Word(nums) # equivalent to Word("0123456789") or Word(srange("0-9")) # a word with a leading capital, and zero or more lowercase capital_word = Word(alphas.upper(), alphas.lower()) # hostnames are alphanumeric, with leading alpha, and '-' hostname = Word(alphas, alphanums+'-') # roman numeral (not a strict parser, accepts invalid mix of characters) roman = Word("IVXLCDM") # any string of non-whitespace characters, except for ',' csv_value = Word(printables, excludeChars=",") """ def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ): super(Word,self).__init__() if excludeChars: initChars = ''.join(c for c in initChars if c not in excludeChars) if bodyChars: bodyChars = ''.join(c for c in bodyChars if c not in excludeChars) self.initCharsOrig = initChars self.initChars = set(initChars) if bodyChars : self.bodyCharsOrig = bodyChars self.bodyChars = set(bodyChars) else: self.bodyCharsOrig = initChars self.bodyChars = set(initChars) self.maxSpecified = max > 0 if min < 1: raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted") self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayIndexError = False self.asKeyword = asKeyword if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0): if self.bodyCharsOrig == self.initCharsOrig: self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig) elif len(self.initCharsOrig) == 1: self.reString = "%s[%s]*" % \ (re.escape(self.initCharsOrig), _escapeRegexRangeChars(self.bodyCharsOrig),) else: self.reString = "[%s][%s]*" % \ (_escapeRegexRangeChars(self.initCharsOrig), _escapeRegexRangeChars(self.bodyCharsOrig),) if self.asKeyword: self.reString = r"\b"+self.reString+r"\b" try: self.re = re.compile( self.reString ) except Exception: self.re = None def parseImpl( self, instring, loc, doActions=True ): if self.re: result = self.re.match(instring,loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() return loc, result.group() if not(instring[ loc ] in self.initChars): raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 instrlen = len(instring) bodychars = self.bodyChars maxloc = start + self.maxLen maxloc = min( maxloc, instrlen ) while loc < maxloc and instring[loc] in bodychars: loc += 1 throwException = False if loc - start < self.minLen: throwException = True if self.maxSpecified and loc < instrlen and instring[loc] in bodychars: throwException = True if self.asKeyword: if (start>0 and instring[start-1] in bodychars) or (loc4: return s[:4]+"..." else: return s if ( self.initCharsOrig != self.bodyCharsOrig ): self.strRepr = "W:(%s,%s)" % ( charsAsStr(self.initCharsOrig), charsAsStr(self.bodyCharsOrig) ) else: self.strRepr = "W:(%s)" % charsAsStr(self.initCharsOrig) return self.strRepr class Regex(Token): """ Token for matching strings that match a given regular expression. Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module. If the given regex contains named groups (defined using C{(?P...)}), these will be preserved as named parse results. Example:: realnum = Regex(r"[+-]?\d+\.\d*") date = Regex(r'(?P\d{4})-(?P\d\d?)-(?P\d\d?)') # ref: http://stackoverflow.com/questions/267399/how-do-you-match-only-valid-roman-numerals-with-a-regular-expression roman = Regex(r"M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})") """ compiledREtype = type(re.compile("[A-Z]")) def __init__( self, pattern, flags=0): """The parameters C{pattern} and C{flags} are passed to the C{re.compile()} function as-is. See the Python C{re} module for an explanation of the acceptable patterns and flags.""" super(Regex,self).__init__() if isinstance(pattern, basestring): if not pattern: warnings.warn("null string passed to Regex; use Empty() instead", SyntaxWarning, stacklevel=2) self.pattern = pattern self.flags = flags try: self.re = re.compile(self.pattern, self.flags) self.reString = self.pattern except sre_constants.error: warnings.warn("invalid pattern (%s) passed to Regex" % pattern, SyntaxWarning, stacklevel=2) raise elif isinstance(pattern, Regex.compiledREtype): self.re = pattern self.pattern = \ self.reString = str(pattern) self.flags = flags else: raise ValueError("Regex may only be constructed with a string or a compiled RE object") self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayIndexError = False self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): result = self.re.match(instring,loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() d = result.groupdict() ret = ParseResults(result.group()) if d: for k in d: ret[k] = d[k] return loc,ret def __str__( self ): try: return super(Regex,self).__str__() except Exception: pass if self.strRepr is None: self.strRepr = "Re:(%s)" % repr(self.pattern) return self.strRepr class QuotedString(Token): r""" Token for matching strings that are delimited by quoting characters. Defined with the following parameters: - quoteChar - string of one or more characters defining the quote delimiting string - escChar - character to escape quotes, typically backslash (default=C{None}) - escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=C{None}) - multiline - boolean indicating whether quotes can span multiple lines (default=C{False}) - unquoteResults - boolean indicating whether the matched text should be unquoted (default=C{True}) - endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=C{None} => same as quoteChar) - convertWhitespaceEscapes - convert escaped whitespace (C{'\t'}, C{'\n'}, etc.) to actual whitespace (default=C{True}) Example:: qs = QuotedString('"') print(qs.searchString('lsjdf "This is the quote" sldjf')) complex_qs = QuotedString('{{', endQuoteChar='}}') print(complex_qs.searchString('lsjdf {{This is the "quote"}} sldjf')) sql_qs = QuotedString('"', escQuote='""') print(sql_qs.searchString('lsjdf "This is the quote with ""embedded"" quotes" sldjf')) prints:: [['This is the quote']] [['This is the "quote"']] [['This is the quote with "embedded" quotes']] """ def __init__( self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None, convertWhitespaceEscapes=True): super(QuotedString,self).__init__() # remove white space from quote chars - wont work anyway quoteChar = quoteChar.strip() if not quoteChar: warnings.warn("quoteChar cannot be the empty string",SyntaxWarning,stacklevel=2) raise SyntaxError() if endQuoteChar is None: endQuoteChar = quoteChar else: endQuoteChar = endQuoteChar.strip() if not endQuoteChar: warnings.warn("endQuoteChar cannot be the empty string",SyntaxWarning,stacklevel=2) raise SyntaxError() self.quoteChar = quoteChar self.quoteCharLen = len(quoteChar) self.firstQuoteChar = quoteChar[0] self.endQuoteChar = endQuoteChar self.endQuoteCharLen = len(endQuoteChar) self.escChar = escChar self.escQuote = escQuote self.unquoteResults = unquoteResults self.convertWhitespaceEscapes = convertWhitespaceEscapes if multiline: self.flags = re.MULTILINE | re.DOTALL self.pattern = r'%s(?:[^%s%s]' % \ ( re.escape(self.quoteChar), _escapeRegexRangeChars(self.endQuoteChar[0]), (escChar is not None and _escapeRegexRangeChars(escChar) or '') ) else: self.flags = 0 self.pattern = r'%s(?:[^%s\n\r%s]' % \ ( re.escape(self.quoteChar), _escapeRegexRangeChars(self.endQuoteChar[0]), (escChar is not None and _escapeRegexRangeChars(escChar) or '') ) if len(self.endQuoteChar) > 1: self.pattern += ( '|(?:' + ')|(?:'.join("%s[^%s]" % (re.escape(self.endQuoteChar[:i]), _escapeRegexRangeChars(self.endQuoteChar[i])) for i in range(len(self.endQuoteChar)-1,0,-1)) + ')' ) if escQuote: self.pattern += (r'|(?:%s)' % re.escape(escQuote)) if escChar: self.pattern += (r'|(?:%s.)' % re.escape(escChar)) self.escCharReplacePattern = re.escape(self.escChar)+"(.)" self.pattern += (r')*%s' % re.escape(self.endQuoteChar)) try: self.re = re.compile(self.pattern, self.flags) self.reString = self.pattern except sre_constants.error: warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern, SyntaxWarning, stacklevel=2) raise self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayIndexError = False self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): result = instring[loc] == self.firstQuoteChar and self.re.match(instring,loc) or None if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() ret = result.group() if self.unquoteResults: # strip off quotes ret = ret[self.quoteCharLen:-self.endQuoteCharLen] if isinstance(ret,basestring): # replace escaped whitespace if '\\' in ret and self.convertWhitespaceEscapes: ws_map = { r'\t' : '\t', r'\n' : '\n', r'\f' : '\f', r'\r' : '\r', } for wslit,wschar in ws_map.items(): ret = ret.replace(wslit, wschar) # replace escaped characters if self.escChar: ret = re.sub(self.escCharReplacePattern,"\g<1>",ret) # replace escaped quotes if self.escQuote: ret = ret.replace(self.escQuote, self.endQuoteChar) return loc, ret def __str__( self ): try: return super(QuotedString,self).__str__() except Exception: pass if self.strRepr is None: self.strRepr = "quoted string, starting with %s ending with %s" % (self.quoteChar, self.endQuoteChar) return self.strRepr class CharsNotIn(Token): """ Token for matching words composed of characters I{not} in a given set (will include whitespace in matched characters if not listed in the provided exclusion set - see example). Defined with string containing all disallowed characters, and an optional minimum, maximum, and/or exact length. The default value for C{min} is 1 (a minimum value < 1 is not valid); the default values for C{max} and C{exact} are 0, meaning no maximum or exact length restriction. Example:: # define a comma-separated-value as anything that is not a ',' csv_value = CharsNotIn(',') print(delimitedList(csv_value).parseString("dkls,lsdkjf,s12 34,@!#,213")) prints:: ['dkls', 'lsdkjf', 's12 34', '@!#', '213'] """ def __init__( self, notChars, min=1, max=0, exact=0 ): super(CharsNotIn,self).__init__() self.skipWhitespace = False self.notChars = notChars if min < 1: raise ValueError("cannot specify a minimum length < 1; use Optional(CharsNotIn()) if zero-length char group is permitted") self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayReturnEmpty = ( self.minLen == 0 ) self.mayIndexError = False def parseImpl( self, instring, loc, doActions=True ): if instring[loc] in self.notChars: raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 notchars = self.notChars maxlen = min( start+self.maxLen, len(instring) ) while loc < maxlen and \ (instring[loc] not in notchars): loc += 1 if loc - start < self.minLen: raise ParseException(instring, loc, self.errmsg, self) return loc, instring[start:loc] def __str__( self ): try: return super(CharsNotIn, self).__str__() except Exception: pass if self.strRepr is None: if len(self.notChars) > 4: self.strRepr = "!W:(%s...)" % self.notChars[:4] else: self.strRepr = "!W:(%s)" % self.notChars return self.strRepr class White(Token): """ Special matching class for matching whitespace. Normally, whitespace is ignored by pyparsing grammars. This class is included when some whitespace structures are significant. Define with a string containing the whitespace characters to be matched; default is C{" \\t\\r\\n"}. Also takes optional C{min}, C{max}, and C{exact} arguments, as defined for the C{L{Word}} class. """ whiteStrs = { " " : "", "\t": "", "\n": "", "\r": "", "\f": "", } def __init__(self, ws=" \t\r\n", min=1, max=0, exact=0): super(White,self).__init__() self.matchWhite = ws self.setWhitespaceChars( "".join(c for c in self.whiteChars if c not in self.matchWhite) ) #~ self.leaveWhitespace() self.name = ("".join(White.whiteStrs[c] for c in self.matchWhite)) self.mayReturnEmpty = True self.errmsg = "Expected " + self.name self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact def parseImpl( self, instring, loc, doActions=True ): if not(instring[ loc ] in self.matchWhite): raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 maxloc = start + self.maxLen maxloc = min( maxloc, len(instring) ) while loc < maxloc and instring[loc] in self.matchWhite: loc += 1 if loc - start < self.minLen: raise ParseException(instring, loc, self.errmsg, self) return loc, instring[start:loc] class _PositionToken(Token): def __init__( self ): super(_PositionToken,self).__init__() self.name=self.__class__.__name__ self.mayReturnEmpty = True self.mayIndexError = False class GoToColumn(_PositionToken): """ Token to advance to a specific column of input text; useful for tabular report scraping. """ def __init__( self, colno ): super(GoToColumn,self).__init__() self.col = colno def preParse( self, instring, loc ): if col(loc,instring) != self.col: instrlen = len(instring) if self.ignoreExprs: loc = self._skipIgnorables( instring, loc ) while loc < instrlen and instring[loc].isspace() and col( loc, instring ) != self.col : loc += 1 return loc def parseImpl( self, instring, loc, doActions=True ): thiscol = col( loc, instring ) if thiscol > self.col: raise ParseException( instring, loc, "Text not in expected column", self ) newloc = loc + self.col - thiscol ret = instring[ loc: newloc ] return newloc, ret class LineStart(_PositionToken): """ Matches if current position is at the beginning of a line within the parse string Example:: test = '''\ AAA this line AAA and this line AAA but not this one B AAA and definitely not this one ''' for t in (LineStart() + 'AAA' + restOfLine).searchString(test): print(t) Prints:: ['AAA', ' this line'] ['AAA', ' and this line'] """ def __init__( self ): super(LineStart,self).__init__() self.errmsg = "Expected start of line" def parseImpl( self, instring, loc, doActions=True ): if col(loc, instring) == 1: return loc, [] raise ParseException(instring, loc, self.errmsg, self) class LineEnd(_PositionToken): """ Matches if current position is at the end of a line within the parse string """ def __init__( self ): super(LineEnd,self).__init__() self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") ) self.errmsg = "Expected end of line" def parseImpl( self, instring, loc, doActions=True ): if loc len(instring): return loc, [] else: raise ParseException(instring, loc, self.errmsg, self) class WordStart(_PositionToken): """ Matches if the current position is at the beginning of a Word, and is not preceded by any character in a given set of C{wordChars} (default=C{printables}). To emulate the C{\b} behavior of regular expressions, use C{WordStart(alphanums)}. C{WordStart} will also match at the beginning of the string being parsed, or at the beginning of a line. """ def __init__(self, wordChars = printables): super(WordStart,self).__init__() self.wordChars = set(wordChars) self.errmsg = "Not at the start of a word" def parseImpl(self, instring, loc, doActions=True ): if loc != 0: if (instring[loc-1] in self.wordChars or instring[loc] not in self.wordChars): raise ParseException(instring, loc, self.errmsg, self) return loc, [] class WordEnd(_PositionToken): """ Matches if the current position is at the end of a Word, and is not followed by any character in a given set of C{wordChars} (default=C{printables}). To emulate the C{\b} behavior of regular expressions, use C{WordEnd(alphanums)}. C{WordEnd} will also match at the end of the string being parsed, or at the end of a line. """ def __init__(self, wordChars = printables): super(WordEnd,self).__init__() self.wordChars = set(wordChars) self.skipWhitespace = False self.errmsg = "Not at the end of a word" def parseImpl(self, instring, loc, doActions=True ): instrlen = len(instring) if instrlen>0 and loc maxExcLoc: maxException = err maxExcLoc = err.loc except IndexError: if len(instring) > maxExcLoc: maxException = ParseException(instring,len(instring),e.errmsg,self) maxExcLoc = len(instring) else: # save match among all matches, to retry longest to shortest matches.append((loc2, e)) if matches: matches.sort(key=lambda x: -x[0]) for _,e in matches: try: return e._parse( instring, loc, doActions ) except ParseException as err: err.__traceback__ = None if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc if maxException is not None: maxException.msg = self.errmsg raise maxException else: raise ParseException(instring, loc, "no defined alternatives to match", self) def __ixor__(self, other ): if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) return self.append( other ) #Or( [ self, other ] ) def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + " ^ ".join(_ustr(e) for e in self.exprs) + "}" return self.strRepr def checkRecursion( self, parseElementList ): subRecCheckList = parseElementList[:] + [ self ] for e in self.exprs: e.checkRecursion( subRecCheckList ) class MatchFirst(ParseExpression): """ Requires that at least one C{ParseExpression} is found. If two expressions match, the first one listed is the one that will match. May be constructed using the C{'|'} operator. Example:: # construct MatchFirst using '|' operator # watch the order of expressions to match number = Word(nums) | Combine(Word(nums) + '.' + Word(nums)) print(number.searchString("123 3.1416 789")) # Fail! -> [['123'], ['3'], ['1416'], ['789']] # put more selective expression first number = Combine(Word(nums) + '.' + Word(nums)) | Word(nums) print(number.searchString("123 3.1416 789")) # Better -> [['123'], ['3.1416'], ['789']] """ def __init__( self, exprs, savelist = False ): super(MatchFirst,self).__init__(exprs, savelist) if self.exprs: self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) else: self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): maxExcLoc = -1 maxException = None for e in self.exprs: try: ret = e._parse( instring, loc, doActions ) return ret except ParseException as err: if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc except IndexError: if len(instring) > maxExcLoc: maxException = ParseException(instring,len(instring),e.errmsg,self) maxExcLoc = len(instring) # only got here if no expression matched, raise exception for match that made it the furthest else: if maxException is not None: maxException.msg = self.errmsg raise maxException else: raise ParseException(instring, loc, "no defined alternatives to match", self) def __ior__(self, other ): if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) return self.append( other ) #MatchFirst( [ self, other ] ) def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + " | ".join(_ustr(e) for e in self.exprs) + "}" return self.strRepr def checkRecursion( self, parseElementList ): subRecCheckList = parseElementList[:] + [ self ] for e in self.exprs: e.checkRecursion( subRecCheckList ) class Each(ParseExpression): """ Requires all given C{ParseExpression}s to be found, but in any order. Expressions may be separated by whitespace. May be constructed using the C{'&'} operator. Example:: color = oneOf("RED ORANGE YELLOW GREEN BLUE PURPLE BLACK WHITE BROWN") shape_type = oneOf("SQUARE CIRCLE TRIANGLE STAR HEXAGON OCTAGON") integer = Word(nums) shape_attr = "shape:" + shape_type("shape") posn_attr = "posn:" + Group(integer("x") + ',' + integer("y"))("posn") color_attr = "color:" + color("color") size_attr = "size:" + integer("size") # use Each (using operator '&') to accept attributes in any order # (shape and posn are required, color and size are optional) shape_spec = shape_attr & posn_attr & Optional(color_attr) & Optional(size_attr) shape_spec.runTests(''' shape: SQUARE color: BLACK posn: 100, 120 shape: CIRCLE size: 50 color: BLUE posn: 50,80 color:GREEN size:20 shape:TRIANGLE posn:20,40 ''' ) prints:: shape: SQUARE color: BLACK posn: 100, 120 ['shape:', 'SQUARE', 'color:', 'BLACK', 'posn:', ['100', ',', '120']] - color: BLACK - posn: ['100', ',', '120'] - x: 100 - y: 120 - shape: SQUARE shape: CIRCLE size: 50 color: BLUE posn: 50,80 ['shape:', 'CIRCLE', 'size:', '50', 'color:', 'BLUE', 'posn:', ['50', ',', '80']] - color: BLUE - posn: ['50', ',', '80'] - x: 50 - y: 80 - shape: CIRCLE - size: 50 color: GREEN size: 20 shape: TRIANGLE posn: 20,40 ['color:', 'GREEN', 'size:', '20', 'shape:', 'TRIANGLE', 'posn:', ['20', ',', '40']] - color: GREEN - posn: ['20', ',', '40'] - x: 20 - y: 40 - shape: TRIANGLE - size: 20 """ def __init__( self, exprs, savelist = True ): super(Each,self).__init__(exprs, savelist) self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) self.skipWhitespace = True self.initExprGroups = True def parseImpl( self, instring, loc, doActions=True ): if self.initExprGroups: self.opt1map = dict((id(e.expr),e) for e in self.exprs if isinstance(e,Optional)) opt1 = [ e.expr for e in self.exprs if isinstance(e,Optional) ] opt2 = [ e for e in self.exprs if e.mayReturnEmpty and not isinstance(e,Optional)] self.optionals = opt1 + opt2 self.multioptionals = [ e.expr for e in self.exprs if isinstance(e,ZeroOrMore) ] self.multirequired = [ e.expr for e in self.exprs if isinstance(e,OneOrMore) ] self.required = [ e for e in self.exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ] self.required += self.multirequired self.initExprGroups = False tmpLoc = loc tmpReqd = self.required[:] tmpOpt = self.optionals[:] matchOrder = [] keepMatching = True while keepMatching: tmpExprs = tmpReqd + tmpOpt + self.multioptionals + self.multirequired failed = [] for e in tmpExprs: try: tmpLoc = e.tryParse( instring, tmpLoc ) except ParseException: failed.append(e) else: matchOrder.append(self.opt1map.get(id(e),e)) if e in tmpReqd: tmpReqd.remove(e) elif e in tmpOpt: tmpOpt.remove(e) if len(failed) == len(tmpExprs): keepMatching = False if tmpReqd: missing = ", ".join(_ustr(e) for e in tmpReqd) raise ParseException(instring,loc,"Missing one or more required elements (%s)" % missing ) # add any unmatched Optionals, in case they have default values defined matchOrder += [e for e in self.exprs if isinstance(e,Optional) and e.expr in tmpOpt] resultlist = [] for e in matchOrder: loc,results = e._parse(instring,loc,doActions) resultlist.append(results) finalResults = sum(resultlist, ParseResults([])) return loc, finalResults def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + " & ".join(_ustr(e) for e in self.exprs) + "}" return self.strRepr def checkRecursion( self, parseElementList ): subRecCheckList = parseElementList[:] + [ self ] for e in self.exprs: e.checkRecursion( subRecCheckList ) class ParseElementEnhance(ParserElement): """ Abstract subclass of C{ParserElement}, for combining and post-processing parsed tokens. """ def __init__( self, expr, savelist=False ): super(ParseElementEnhance,self).__init__(savelist) if isinstance( expr, basestring ): if issubclass(ParserElement._literalStringClass, Token): expr = ParserElement._literalStringClass(expr) else: expr = ParserElement._literalStringClass(Literal(expr)) self.expr = expr self.strRepr = None if expr is not None: self.mayIndexError = expr.mayIndexError self.mayReturnEmpty = expr.mayReturnEmpty self.setWhitespaceChars( expr.whiteChars ) self.skipWhitespace = expr.skipWhitespace self.saveAsList = expr.saveAsList self.callPreparse = expr.callPreparse self.ignoreExprs.extend(expr.ignoreExprs) def parseImpl( self, instring, loc, doActions=True ): if self.expr is not None: return self.expr._parse( instring, loc, doActions, callPreParse=False ) else: raise ParseException("",loc,self.errmsg,self) def leaveWhitespace( self ): self.skipWhitespace = False self.expr = self.expr.copy() if self.expr is not None: self.expr.leaveWhitespace() return self def ignore( self, other ): if isinstance( other, Suppress ): if other not in self.ignoreExprs: super( ParseElementEnhance, self).ignore( other ) if self.expr is not None: self.expr.ignore( self.ignoreExprs[-1] ) else: super( ParseElementEnhance, self).ignore( other ) if self.expr is not None: self.expr.ignore( self.ignoreExprs[-1] ) return self def streamline( self ): super(ParseElementEnhance,self).streamline() if self.expr is not None: self.expr.streamline() return self def checkRecursion( self, parseElementList ): if self in parseElementList: raise RecursiveGrammarException( parseElementList+[self] ) subRecCheckList = parseElementList[:] + [ self ] if self.expr is not None: self.expr.checkRecursion( subRecCheckList ) def validate( self, validateTrace=[] ): tmp = validateTrace[:]+[self] if self.expr is not None: self.expr.validate(tmp) self.checkRecursion( [] ) def __str__( self ): try: return super(ParseElementEnhance,self).__str__() except Exception: pass if self.strRepr is None and self.expr is not None: self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.expr) ) return self.strRepr class FollowedBy(ParseElementEnhance): """ Lookahead matching of the given parse expression. C{FollowedBy} does I{not} advance the parsing position within the input string, it only verifies that the specified parse expression matches at the current position. C{FollowedBy} always returns a null token list. Example:: # use FollowedBy to match a label only if it is followed by a ':' data_word = Word(alphas) label = data_word + FollowedBy(':') attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) OneOrMore(attr_expr).parseString("shape: SQUARE color: BLACK posn: upper left").pprint() prints:: [['shape', 'SQUARE'], ['color', 'BLACK'], ['posn', 'upper left']] """ def __init__( self, expr ): super(FollowedBy,self).__init__(expr) self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): self.expr.tryParse( instring, loc ) return loc, [] class NotAny(ParseElementEnhance): """ Lookahead to disallow matching with the given parse expression. C{NotAny} does I{not} advance the parsing position within the input string, it only verifies that the specified parse expression does I{not} match at the current position. Also, C{NotAny} does I{not} skip over leading whitespace. C{NotAny} always returns a null token list. May be constructed using the '~' operator. Example:: """ def __init__( self, expr ): super(NotAny,self).__init__(expr) #~ self.leaveWhitespace() self.skipWhitespace = False # do NOT use self.leaveWhitespace(), don't want to propagate to exprs self.mayReturnEmpty = True self.errmsg = "Found unwanted token, "+_ustr(self.expr) def parseImpl( self, instring, loc, doActions=True ): if self.expr.canParseNext(instring, loc): raise ParseException(instring, loc, self.errmsg, self) return loc, [] def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "~{" + _ustr(self.expr) + "}" return self.strRepr class _MultipleMatch(ParseElementEnhance): def __init__( self, expr, stopOn=None): super(_MultipleMatch, self).__init__(expr) self.saveAsList = True ender = stopOn if isinstance(ender, basestring): ender = ParserElement._literalStringClass(ender) self.not_ender = ~ender if ender is not None else None def parseImpl( self, instring, loc, doActions=True ): self_expr_parse = self.expr._parse self_skip_ignorables = self._skipIgnorables check_ender = self.not_ender is not None if check_ender: try_not_ender = self.not_ender.tryParse # must be at least one (but first see if we are the stopOn sentinel; # if so, fail) if check_ender: try_not_ender(instring, loc) loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False ) try: hasIgnoreExprs = (not not self.ignoreExprs) while 1: if check_ender: try_not_ender(instring, loc) if hasIgnoreExprs: preloc = self_skip_ignorables( instring, loc ) else: preloc = loc loc, tmptokens = self_expr_parse( instring, preloc, doActions ) if tmptokens or tmptokens.haskeys(): tokens += tmptokens except (ParseException,IndexError): pass return loc, tokens class OneOrMore(_MultipleMatch): """ Repetition of one or more of the given expression. Parameters: - expr - expression that must match one or more times - stopOn - (default=C{None}) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression) Example:: data_word = Word(alphas) label = data_word + FollowedBy(':') attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join)) text = "shape: SQUARE posn: upper left color: BLACK" OneOrMore(attr_expr).parseString(text).pprint() # Fail! read 'color' as data instead of next label -> [['shape', 'SQUARE color']] # use stopOn attribute for OneOrMore to avoid reading label string as part of the data attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) OneOrMore(attr_expr).parseString(text).pprint() # Better -> [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'BLACK']] # could also be written as (attr_expr * (1,)).parseString(text).pprint() """ def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + _ustr(self.expr) + "}..." return self.strRepr class ZeroOrMore(_MultipleMatch): """ Optional repetition of zero or more of the given expression. Parameters: - expr - expression that must match zero or more times - stopOn - (default=C{None}) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression) Example: similar to L{OneOrMore} """ def __init__( self, expr, stopOn=None): super(ZeroOrMore,self).__init__(expr, stopOn=stopOn) self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): try: return super(ZeroOrMore, self).parseImpl(instring, loc, doActions) except (ParseException,IndexError): return loc, [] def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "[" + _ustr(self.expr) + "]..." return self.strRepr class _NullToken(object): def __bool__(self): return False __nonzero__ = __bool__ def __str__(self): return "" _optionalNotMatched = _NullToken() class Optional(ParseElementEnhance): """ Optional matching of the given expression. Parameters: - expr - expression that must match zero or more times - default (optional) - value to be returned if the optional expression is not found. Example:: # US postal code can be a 5-digit zip, plus optional 4-digit qualifier zip = Combine(Word(nums, exact=5) + Optional('-' + Word(nums, exact=4))) zip.runTests(''' # traditional ZIP code 12345 # ZIP+4 form 12101-0001 # invalid ZIP 98765- ''') prints:: # traditional ZIP code 12345 ['12345'] # ZIP+4 form 12101-0001 ['12101-0001'] # invalid ZIP 98765- ^ FAIL: Expected end of text (at char 5), (line:1, col:6) """ def __init__( self, expr, default=_optionalNotMatched ): super(Optional,self).__init__( expr, savelist=False ) self.saveAsList = self.expr.saveAsList self.defaultValue = default self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): try: loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False ) except (ParseException,IndexError): if self.defaultValue is not _optionalNotMatched: if self.expr.resultsName: tokens = ParseResults([ self.defaultValue ]) tokens[self.expr.resultsName] = self.defaultValue else: tokens = [ self.defaultValue ] else: tokens = [] return loc, tokens def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "[" + _ustr(self.expr) + "]" return self.strRepr class SkipTo(ParseElementEnhance): """ Token for skipping over all undefined text until the matched expression is found. Parameters: - expr - target expression marking the end of the data to be skipped - include - (default=C{False}) if True, the target expression is also parsed (the skipped text and target expression are returned as a 2-element list). - ignore - (default=C{None}) used to define grammars (typically quoted strings and comments) that might contain false matches to the target expression - failOn - (default=C{None}) define expressions that are not allowed to be included in the skipped test; if found before the target expression is found, the SkipTo is not a match Example:: report = ''' Outstanding Issues Report - 1 Jan 2000 # | Severity | Description | Days Open -----+----------+-------------------------------------------+----------- 101 | Critical | Intermittent system crash | 6 94 | Cosmetic | Spelling error on Login ('log|n') | 14 79 | Minor | System slow when running too many reports | 47 ''' integer = Word(nums) SEP = Suppress('|') # use SkipTo to simply match everything up until the next SEP # - ignore quoted strings, so that a '|' character inside a quoted string does not match # - parse action will call token.strip() for each matched token, i.e., the description body string_data = SkipTo(SEP, ignore=quotedString) string_data.setParseAction(tokenMap(str.strip)) ticket_expr = (integer("issue_num") + SEP + string_data("sev") + SEP + string_data("desc") + SEP + integer("days_open")) for tkt in ticket_expr.searchString(report): print tkt.dump() prints:: ['101', 'Critical', 'Intermittent system crash', '6'] - days_open: 6 - desc: Intermittent system crash - issue_num: 101 - sev: Critical ['94', 'Cosmetic', "Spelling error on Login ('log|n')", '14'] - days_open: 14 - desc: Spelling error on Login ('log|n') - issue_num: 94 - sev: Cosmetic ['79', 'Minor', 'System slow when running too many reports', '47'] - days_open: 47 - desc: System slow when running too many reports - issue_num: 79 - sev: Minor """ def __init__( self, other, include=False, ignore=None, failOn=None ): super( SkipTo, self ).__init__( other ) self.ignoreExpr = ignore self.mayReturnEmpty = True self.mayIndexError = False self.includeMatch = include self.asList = False if isinstance(failOn, basestring): self.failOn = ParserElement._literalStringClass(failOn) else: self.failOn = failOn self.errmsg = "No match found for "+_ustr(self.expr) def parseImpl( self, instring, loc, doActions=True ): startloc = loc instrlen = len(instring) expr = self.expr expr_parse = self.expr._parse self_failOn_canParseNext = self.failOn.canParseNext if self.failOn is not None else None self_ignoreExpr_tryParse = self.ignoreExpr.tryParse if self.ignoreExpr is not None else None tmploc = loc while tmploc <= instrlen: if self_failOn_canParseNext is not None: # break if failOn expression matches if self_failOn_canParseNext(instring, tmploc): break if self_ignoreExpr_tryParse is not None: # advance past ignore expressions while 1: try: tmploc = self_ignoreExpr_tryParse(instring, tmploc) except ParseBaseException: break try: expr_parse(instring, tmploc, doActions=False, callPreParse=False) except (ParseException, IndexError): # no match, advance loc in string tmploc += 1 else: # matched skipto expr, done break else: # ran off the end of the input string without matching skipto expr, fail raise ParseException(instring, loc, self.errmsg, self) # build up return values loc = tmploc skiptext = instring[startloc:loc] skipresult = ParseResults(skiptext) if self.includeMatch: loc, mat = expr_parse(instring,loc,doActions,callPreParse=False) skipresult += mat return loc, skipresult class Forward(ParseElementEnhance): """ Forward declaration of an expression to be defined later - used for recursive grammars, such as algebraic infix notation. When the expression is known, it is assigned to the C{Forward} variable using the '<<' operator. Note: take care when assigning to C{Forward} not to overlook precedence of operators. Specifically, '|' has a lower precedence than '<<', so that:: fwdExpr << a | b | c will actually be evaluated as:: (fwdExpr << a) | b | c thereby leaving b and c out as parseable alternatives. It is recommended that you explicitly group the values inserted into the C{Forward}:: fwdExpr << (a | b | c) Converting to use the '<<=' operator instead will avoid this problem. See L{ParseResults.pprint} for an example of a recursive parser created using C{Forward}. """ def __init__( self, other=None ): super(Forward,self).__init__( other, savelist=False ) def __lshift__( self, other ): if isinstance( other, basestring ): other = ParserElement._literalStringClass(other) self.expr = other self.strRepr = None self.mayIndexError = self.expr.mayIndexError self.mayReturnEmpty = self.expr.mayReturnEmpty self.setWhitespaceChars( self.expr.whiteChars ) self.skipWhitespace = self.expr.skipWhitespace self.saveAsList = self.expr.saveAsList self.ignoreExprs.extend(self.expr.ignoreExprs) return self def __ilshift__(self, other): return self << other def leaveWhitespace( self ): self.skipWhitespace = False return self def streamline( self ): if not self.streamlined: self.streamlined = True if self.expr is not None: self.expr.streamline() return self def validate( self, validateTrace=[] ): if self not in validateTrace: tmp = validateTrace[:]+[self] if self.expr is not None: self.expr.validate(tmp) self.checkRecursion([]) def __str__( self ): if hasattr(self,"name"): return self.name return self.__class__.__name__ + ": ..." # stubbed out for now - creates awful memory and perf issues self._revertClass = self.__class__ self.__class__ = _ForwardNoRecurse try: if self.expr is not None: retString = _ustr(self.expr) else: retString = "None" finally: self.__class__ = self._revertClass return self.__class__.__name__ + ": " + retString def copy(self): if self.expr is not None: return super(Forward,self).copy() else: ret = Forward() ret <<= self return ret class _ForwardNoRecurse(Forward): def __str__( self ): return "..." class TokenConverter(ParseElementEnhance): """ Abstract subclass of C{ParseExpression}, for converting parsed results. """ def __init__( self, expr, savelist=False ): super(TokenConverter,self).__init__( expr )#, savelist ) self.saveAsList = False class Combine(TokenConverter): """ Converter to concatenate all matching tokens to a single string. By default, the matching patterns must also be contiguous in the input string; this can be disabled by specifying C{'adjacent=False'} in the constructor. Example:: real = Word(nums) + '.' + Word(nums) print(real.parseString('3.1416')) # -> ['3', '.', '1416'] # will also erroneously match the following print(real.parseString('3. 1416')) # -> ['3', '.', '1416'] real = Combine(Word(nums) + '.' + Word(nums)) print(real.parseString('3.1416')) # -> ['3.1416'] # no match when there are internal spaces print(real.parseString('3. 1416')) # -> Exception: Expected W:(0123...) """ def __init__( self, expr, joinString="", adjacent=True ): super(Combine,self).__init__( expr ) # suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself if adjacent: self.leaveWhitespace() self.adjacent = adjacent self.skipWhitespace = True self.joinString = joinString self.callPreparse = True def ignore( self, other ): if self.adjacent: ParserElement.ignore(self, other) else: super( Combine, self).ignore( other ) return self def postParse( self, instring, loc, tokenlist ): retToks = tokenlist.copy() del retToks[:] retToks += ParseResults([ "".join(tokenlist._asStringList(self.joinString)) ], modal=self.modalResults) if self.resultsName and retToks.haskeys(): return [ retToks ] else: return retToks class Group(TokenConverter): """ Converter to return the matched tokens as a list - useful for returning tokens of C{L{ZeroOrMore}} and C{L{OneOrMore}} expressions. Example:: ident = Word(alphas) num = Word(nums) term = ident | num func = ident + Optional(delimitedList(term)) print(func.parseString("fn a,b,100")) # -> ['fn', 'a', 'b', '100'] func = ident + Group(Optional(delimitedList(term))) print(func.parseString("fn a,b,100")) # -> ['fn', ['a', 'b', '100']] """ def __init__( self, expr ): super(Group,self).__init__( expr ) self.saveAsList = True def postParse( self, instring, loc, tokenlist ): return [ tokenlist ] class Dict(TokenConverter): """ Converter to return a repetitive expression as a list, but also as a dictionary. Each element can also be referenced using the first token in the expression as its key. Useful for tabular report scraping when the first column can be used as a item key. Example:: data_word = Word(alphas) label = data_word + FollowedBy(':') attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join)) text = "shape: SQUARE posn: upper left color: light blue texture: burlap" attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) # print attributes as plain groups print(OneOrMore(attr_expr).parseString(text).dump()) # instead of OneOrMore(expr), parse using Dict(OneOrMore(Group(expr))) - Dict will auto-assign names result = Dict(OneOrMore(Group(attr_expr))).parseString(text) print(result.dump()) # access named fields as dict entries, or output as dict print(result['shape']) print(result.asDict()) prints:: ['shape', 'SQUARE', 'posn', 'upper left', 'color', 'light blue', 'texture', 'burlap'] [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']] - color: light blue - posn: upper left - shape: SQUARE - texture: burlap SQUARE {'color': 'light blue', 'posn': 'upper left', 'texture': 'burlap', 'shape': 'SQUARE'} See more examples at L{ParseResults} of accessing fields by results name. """ def __init__( self, expr ): super(Dict,self).__init__( expr ) self.saveAsList = True def postParse( self, instring, loc, tokenlist ): for i,tok in enumerate(tokenlist): if len(tok) == 0: continue ikey = tok[0] if isinstance(ikey,int): ikey = _ustr(tok[0]).strip() if len(tok)==1: tokenlist[ikey] = _ParseResultsWithOffset("",i) elif len(tok)==2 and not isinstance(tok[1],ParseResults): tokenlist[ikey] = _ParseResultsWithOffset(tok[1],i) else: dictvalue = tok.copy() #ParseResults(i) del dictvalue[0] if len(dictvalue)!= 1 or (isinstance(dictvalue,ParseResults) and dictvalue.haskeys()): tokenlist[ikey] = _ParseResultsWithOffset(dictvalue,i) else: tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0],i) if self.resultsName: return [ tokenlist ] else: return tokenlist class Suppress(TokenConverter): """ Converter for ignoring the results of a parsed expression. Example:: source = "a, b, c,d" wd = Word(alphas) wd_list1 = wd + ZeroOrMore(',' + wd) print(wd_list1.parseString(source)) # often, delimiters that are useful during parsing are just in the # way afterward - use Suppress to keep them out of the parsed output wd_list2 = wd + ZeroOrMore(Suppress(',') + wd) print(wd_list2.parseString(source)) prints:: ['a', ',', 'b', ',', 'c', ',', 'd'] ['a', 'b', 'c', 'd'] (See also L{delimitedList}.) """ def postParse( self, instring, loc, tokenlist ): return [] def suppress( self ): return self class OnlyOnce(object): """ Wrapper for parse actions, to ensure they are only called once. """ def __init__(self, methodCall): self.callable = _trim_arity(methodCall) self.called = False def __call__(self,s,l,t): if not self.called: results = self.callable(s,l,t) self.called = True return results raise ParseException(s,l,"") def reset(self): self.called = False def traceParseAction(f): """ Decorator for debugging parse actions. When the parse action is called, this decorator will print C{">> entering I{method-name}(line:I{current_source_line}, I{parse_location}, I{matched_tokens})".} When the parse action completes, the decorator will print C{"<<"} followed by the returned value, or any exception that the parse action raised. Example:: wd = Word(alphas) @traceParseAction def remove_duplicate_chars(tokens): return ''.join(sorted(set(''.join(tokens))) wds = OneOrMore(wd).setParseAction(remove_duplicate_chars) print(wds.parseString("slkdjs sld sldd sdlf sdljf")) prints:: >>entering remove_duplicate_chars(line: 'slkdjs sld sldd sdlf sdljf', 0, (['slkdjs', 'sld', 'sldd', 'sdlf', 'sdljf'], {})) <3: thisFunc = paArgs[0].__class__.__name__ + '.' + thisFunc sys.stderr.write( ">>entering %s(line: '%s', %d, %r)\n" % (thisFunc,line(l,s),l,t) ) try: ret = f(*paArgs) except Exception as exc: sys.stderr.write( "< ['aa', 'bb', 'cc'] delimitedList(Word(hexnums), delim=':', combine=True).parseString("AA:BB:CC:DD:EE") # -> ['AA:BB:CC:DD:EE'] """ dlName = _ustr(expr)+" ["+_ustr(delim)+" "+_ustr(expr)+"]..." if combine: return Combine( expr + ZeroOrMore( delim + expr ) ).setName(dlName) else: return ( expr + ZeroOrMore( Suppress( delim ) + expr ) ).setName(dlName) def countedArray( expr, intExpr=None ): """ Helper to define a counted list of expressions. This helper defines a pattern of the form:: integer expr expr expr... where the leading integer tells how many expr expressions follow. The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed. If C{intExpr} is specified, it should be a pyparsing expression that produces an integer value. Example:: countedArray(Word(alphas)).parseString('2 ab cd ef') # -> ['ab', 'cd'] # in this parser, the leading integer value is given in binary, # '10' indicating that 2 values are in the array binaryConstant = Word('01').setParseAction(lambda t: int(t[0], 2)) countedArray(Word(alphas), intExpr=binaryConstant).parseString('10 ab cd ef') # -> ['ab', 'cd'] """ arrayExpr = Forward() def countFieldParseAction(s,l,t): n = t[0] arrayExpr << (n and Group(And([expr]*n)) or Group(empty)) return [] if intExpr is None: intExpr = Word(nums).setParseAction(lambda t:int(t[0])) else: intExpr = intExpr.copy() intExpr.setName("arrayLen") intExpr.addParseAction(countFieldParseAction, callDuringTry=True) return ( intExpr + arrayExpr ).setName('(len) ' + _ustr(expr) + '...') def _flatten(L): ret = [] for i in L: if isinstance(i,list): ret.extend(_flatten(i)) else: ret.append(i) return ret def matchPreviousLiteral(expr): """ Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression. For example:: first = Word(nums) second = matchPreviousLiteral(first) matchExpr = first + ":" + second will match C{"1:1"}, but not C{"1:2"}. Because this matches a previous literal, will also match the leading C{"1:1"} in C{"1:10"}. If this is not desired, use C{matchPreviousExpr}. Do I{not} use with packrat parsing enabled. """ rep = Forward() def copyTokenToRepeater(s,l,t): if t: if len(t) == 1: rep << t[0] else: # flatten t tokens tflat = _flatten(t.asList()) rep << And(Literal(tt) for tt in tflat) else: rep << Empty() expr.addParseAction(copyTokenToRepeater, callDuringTry=True) rep.setName('(prev) ' + _ustr(expr)) return rep def matchPreviousExpr(expr): """ Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression. For example:: first = Word(nums) second = matchPreviousExpr(first) matchExpr = first + ":" + second will match C{"1:1"}, but not C{"1:2"}. Because this matches by expressions, will I{not} match the leading C{"1:1"} in C{"1:10"}; the expressions are evaluated first, and then compared, so C{"1"} is compared with C{"10"}. Do I{not} use with packrat parsing enabled. """ rep = Forward() e2 = expr.copy() rep <<= e2 def copyTokenToRepeater(s,l,t): matchTokens = _flatten(t.asList()) def mustMatchTheseTokens(s,l,t): theseTokens = _flatten(t.asList()) if theseTokens != matchTokens: raise ParseException("",0,"") rep.setParseAction( mustMatchTheseTokens, callDuringTry=True ) expr.addParseAction(copyTokenToRepeater, callDuringTry=True) rep.setName('(prev) ' + _ustr(expr)) return rep def _escapeRegexRangeChars(s): #~ escape these chars: ^-] for c in r"\^-]": s = s.replace(c,_bslash+c) s = s.replace("\n",r"\n") s = s.replace("\t",r"\t") return _ustr(s) def oneOf( strs, caseless=False, useRegex=True ): """ Helper to quickly define a set of alternative Literals, and makes sure to do longest-first testing when there is a conflict, regardless of the input order, but returns a C{L{MatchFirst}} for best performance. Parameters: - strs - a string of space-delimited literals, or a collection of string literals - caseless - (default=C{False}) - treat all literals as caseless - useRegex - (default=C{True}) - as an optimization, will generate a Regex object; otherwise, will generate a C{MatchFirst} object (if C{caseless=True}, or if creating a C{Regex} raises an exception) Example:: comp_oper = oneOf("< = > <= >= !=") var = Word(alphas) number = Word(nums) term = var | number comparison_expr = term + comp_oper + term print(comparison_expr.searchString("B = 12 AA=23 B<=AA AA>12")) prints:: [['B', '=', '12'], ['AA', '=', '23'], ['B', '<=', 'AA'], ['AA', '>', '12']] """ if caseless: isequal = ( lambda a,b: a.upper() == b.upper() ) masks = ( lambda a,b: b.upper().startswith(a.upper()) ) parseElementClass = CaselessLiteral else: isequal = ( lambda a,b: a == b ) masks = ( lambda a,b: b.startswith(a) ) parseElementClass = Literal symbols = [] if isinstance(strs,basestring): symbols = strs.split() elif isinstance(strs, collections.Iterable): symbols = list(strs) else: warnings.warn("Invalid argument to oneOf, expected string or iterable", SyntaxWarning, stacklevel=2) if not symbols: return NoMatch() i = 0 while i < len(symbols)-1: cur = symbols[i] for j,other in enumerate(symbols[i+1:]): if ( isequal(other, cur) ): del symbols[i+j+1] break elif ( masks(cur, other) ): del symbols[i+j+1] symbols.insert(i,other) cur = other break else: i += 1 if not caseless and useRegex: #~ print (strs,"->", "|".join( [ _escapeRegexChars(sym) for sym in symbols] )) try: if len(symbols)==len("".join(symbols)): return Regex( "[%s]" % "".join(_escapeRegexRangeChars(sym) for sym in symbols) ).setName(' | '.join(symbols)) else: return Regex( "|".join(re.escape(sym) for sym in symbols) ).setName(' | '.join(symbols)) except Exception: warnings.warn("Exception creating Regex for oneOf, building MatchFirst", SyntaxWarning, stacklevel=2) # last resort, just use MatchFirst return MatchFirst(parseElementClass(sym) for sym in symbols).setName(' | '.join(symbols)) def dictOf( key, value ): """ Helper to easily and clearly define a dictionary by specifying the respective patterns for the key and value. Takes care of defining the C{L{Dict}}, C{L{ZeroOrMore}}, and C{L{Group}} tokens in the proper order. The key pattern can include delimiting markers or punctuation, as long as they are suppressed, thereby leaving the significant key text. The value pattern can include named results, so that the C{Dict} results can include named token fields. Example:: text = "shape: SQUARE posn: upper left color: light blue texture: burlap" attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)) print(OneOrMore(attr_expr).parseString(text).dump()) attr_label = label attr_value = Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join) # similar to Dict, but simpler call format result = dictOf(attr_label, attr_value).parseString(text) print(result.dump()) print(result['shape']) print(result.shape) # object attribute access works too print(result.asDict()) prints:: [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']] - color: light blue - posn: upper left - shape: SQUARE - texture: burlap SQUARE SQUARE {'color': 'light blue', 'shape': 'SQUARE', 'posn': 'upper left', 'texture': 'burlap'} """ return Dict( ZeroOrMore( Group ( key + value ) ) ) def originalTextFor(expr, asString=True): """ Helper to return the original, untokenized text for a given expression. Useful to restore the parsed fields of an HTML start tag into the raw tag text itself, or to revert separate tokens with intervening whitespace back to the original matching input text. By default, returns astring containing the original parsed text. If the optional C{asString} argument is passed as C{False}, then the return value is a C{L{ParseResults}} containing any results names that were originally matched, and a single token containing the original matched text from the input string. So if the expression passed to C{L{originalTextFor}} contains expressions with defined results names, you must set C{asString} to C{False} if you want to preserve those results name values. Example:: src = "this is test bold text normal text " for tag in ("b","i"): opener,closer = makeHTMLTags(tag) patt = originalTextFor(opener + SkipTo(closer) + closer) print(patt.searchString(src)[0]) prints:: [' bold text '] ['text'] """ locMarker = Empty().setParseAction(lambda s,loc,t: loc) endlocMarker = locMarker.copy() endlocMarker.callPreparse = False matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end") if asString: extractText = lambda s,l,t: s[t._original_start:t._original_end] else: def extractText(s,l,t): t[:] = [s[t.pop('_original_start'):t.pop('_original_end')]] matchExpr.setParseAction(extractText) matchExpr.ignoreExprs = expr.ignoreExprs return matchExpr def ungroup(expr): """ Helper to undo pyparsing's default grouping of And expressions, even if all but one are non-empty. """ return TokenConverter(expr).setParseAction(lambda t:t[0]) def locatedExpr(expr): """ Helper to decorate a returned token with its starting and ending locations in the input string. This helper adds the following results names: - locn_start = location where matched expression begins - locn_end = location where matched expression ends - value = the actual parsed results Be careful if the input text contains C{} characters, you may want to call C{L{ParserElement.parseWithTabs}} Example:: wd = Word(alphas) for match in locatedExpr(wd).searchString("ljsdf123lksdjjf123lkkjj1222"): print(match) prints:: [[0, 'ljsdf', 5]] [[8, 'lksdjjf', 15]] [[18, 'lkkjj', 23]] """ locator = Empty().setParseAction(lambda s,l,t: l) return Group(locator("locn_start") + expr("value") + locator.copy().leaveWhitespace()("locn_end")) # convenience constants for positional expressions empty = Empty().setName("empty") lineStart = LineStart().setName("lineStart") lineEnd = LineEnd().setName("lineEnd") stringStart = StringStart().setName("stringStart") stringEnd = StringEnd().setName("stringEnd") _escapedPunc = Word( _bslash, r"\[]-*.$+^?()~ ", exact=2 ).setParseAction(lambda s,l,t:t[0][1]) _escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").setParseAction(lambda s,l,t:unichr(int(t[0].lstrip(r'\0x'),16))) _escapedOctChar = Regex(r"\\0[0-7]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],8))) _singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(printables, excludeChars=r'\]', exact=1) | Regex(r"\w", re.UNICODE) _charRange = Group(_singleChar + Suppress("-") + _singleChar) _reBracketExpr = Literal("[") + Optional("^").setResultsName("negate") + Group( OneOrMore( _charRange | _singleChar ) ).setResultsName("body") + "]" def srange(s): r""" Helper to easily define string ranges for use in Word construction. Borrows syntax from regexp '[]' string range definitions:: srange("[0-9]") -> "0123456789" srange("[a-z]") -> "abcdefghijklmnopqrstuvwxyz" srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_" The input string must be enclosed in []'s, and the returned string is the expanded character set joined into a single string. The values enclosed in the []'s may be: - a single character - an escaped character with a leading backslash (such as C{\-} or C{\]}) - an escaped hex character with a leading C{'\x'} (C{\x21}, which is a C{'!'} character) (C{\0x##} is also supported for backwards compatibility) - an escaped octal character with a leading C{'\0'} (C{\041}, which is a C{'!'} character) - a range of any of the above, separated by a dash (C{'a-z'}, etc.) - any combination of the above (C{'aeiouy'}, C{'a-zA-Z0-9_$'}, etc.) """ _expanded = lambda p: p if not isinstance(p,ParseResults) else ''.join(unichr(c) for c in range(ord(p[0]),ord(p[1])+1)) try: return "".join(_expanded(part) for part in _reBracketExpr.parseString(s).body) except Exception: return "" def matchOnlyAtCol(n): """ Helper method for defining parse actions that require matching at a specific column in the input text. """ def verifyCol(strg,locn,toks): if col(locn,strg) != n: raise ParseException(strg,locn,"matched token not at column %d" % n) return verifyCol def replaceWith(replStr): """ Helper method for common parse actions that simply return a literal value. Especially useful when used with C{L{transformString}()}. Example:: num = Word(nums).setParseAction(lambda toks: int(toks[0])) na = oneOf("N/A NA").setParseAction(replaceWith(math.nan)) term = na | num OneOrMore(term).parseString("324 234 N/A 234") # -> [324, 234, nan, 234] """ return lambda s,l,t: [replStr] def removeQuotes(s,l,t): """ Helper parse action for removing quotation marks from parsed quoted strings. Example:: # by default, quotation marks are included in parsed results quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["'Now is the Winter of our Discontent'"] # use removeQuotes to strip quotation marks from parsed results quotedString.setParseAction(removeQuotes) quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["Now is the Winter of our Discontent"] """ return t[0][1:-1] def tokenMap(func, *args): """ Helper to define a parse action by mapping a function to all elements of a ParseResults list.If any additional args are passed, they are forwarded to the given function as additional arguments after the token, as in C{hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16))}, which will convert the parsed data to an integer using base 16. Example (compare the last to example in L{ParserElement.transformString}:: hex_ints = OneOrMore(Word(hexnums)).setParseAction(tokenMap(int, 16)) hex_ints.runTests(''' 00 11 22 aa FF 0a 0d 1a ''') upperword = Word(alphas).setParseAction(tokenMap(str.upper)) OneOrMore(upperword).runTests(''' my kingdom for a horse ''') wd = Word(alphas).setParseAction(tokenMap(str.title)) OneOrMore(wd).setParseAction(' '.join).runTests(''' now is the winter of our discontent made glorious summer by this sun of york ''') prints:: 00 11 22 aa FF 0a 0d 1a [0, 17, 34, 170, 255, 10, 13, 26] my kingdom for a horse ['MY', 'KINGDOM', 'FOR', 'A', 'HORSE'] now is the winter of our discontent made glorious summer by this sun of york ['Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York'] """ def pa(s,l,t): return [func(tokn, *args) for tokn in t] try: func_name = getattr(func, '__name__', getattr(func, '__class__').__name__) except Exception: func_name = str(func) pa.__name__ = func_name return pa upcaseTokens = tokenMap(lambda t: _ustr(t).upper()) """(Deprecated) Helper parse action to convert tokens to upper case. Deprecated in favor of L{pyparsing_common.upcaseTokens}""" downcaseTokens = tokenMap(lambda t: _ustr(t).lower()) """(Deprecated) Helper parse action to convert tokens to lower case. Deprecated in favor of L{pyparsing_common.downcaseTokens}""" def _makeTags(tagStr, xml): """Internal helper to construct opening and closing tag expressions, given a tag name""" if isinstance(tagStr,basestring): resname = tagStr tagStr = Keyword(tagStr, caseless=not xml) else: resname = tagStr.name tagAttrName = Word(alphas,alphanums+"_-:") if (xml): tagAttrValue = dblQuotedString.copy().setParseAction( removeQuotes ) openTag = Suppress("<") + tagStr("tag") + \ Dict(ZeroOrMore(Group( tagAttrName + Suppress("=") + tagAttrValue ))) + \ Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">") else: printablesLessRAbrack = "".join(c for c in printables if c not in ">") tagAttrValue = quotedString.copy().setParseAction( removeQuotes ) | Word(printablesLessRAbrack) openTag = Suppress("<") + tagStr("tag") + \ Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \ Optional( Suppress("=") + tagAttrValue ) ))) + \ Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">") closeTag = Combine(_L("") openTag = openTag.setResultsName("start"+"".join(resname.replace(":"," ").title().split())).setName("<%s>" % resname) closeTag = closeTag.setResultsName("end"+"".join(resname.replace(":"," ").title().split())).setName("" % resname) openTag.tag = resname closeTag.tag = resname return openTag, closeTag def makeHTMLTags(tagStr): """ Helper to construct opening and closing tag expressions for HTML, given a tag name. Matches tags in either upper or lower case, attributes with namespaces and with quoted or unquoted values. Example:: text = 'More info at the pyparsing wiki page' # makeHTMLTags returns pyparsing expressions for the opening and closing tags as a 2-tuple a,a_end = makeHTMLTags("A") link_expr = a + SkipTo(a_end)("link_text") + a_end for link in link_expr.searchString(text): # attributes in the tag (like "href" shown here) are also accessible as named results print(link.link_text, '->', link.href) prints:: pyparsing -> http://pyparsing.wikispaces.com """ return _makeTags( tagStr, False ) def makeXMLTags(tagStr): """ Helper to construct opening and closing tag expressions for XML, given a tag name. Matches tags only in the given upper/lower case. Example: similar to L{makeHTMLTags} """ return _makeTags( tagStr, True ) def withAttribute(*args,**attrDict): """ Helper to create a validating parse action to be used with start tags created with C{L{makeXMLTags}} or C{L{makeHTMLTags}}. Use C{withAttribute} to qualify a starting tag with a required attribute value, to avoid false matches on common tags such as C{} or C{
}. Call C{withAttribute} with a series of attribute names and values. Specify the list of filter attributes names and values as: - keyword arguments, as in C{(align="right")}, or - as an explicit dict with C{**} operator, when an attribute name is also a Python reserved word, as in C{**{"class":"Customer", "align":"right"}} - a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") ) For attribute names with a namespace prefix, you must use the second form. Attribute names are matched insensitive to upper/lower case. If just testing for C{class} (with or without a namespace), use C{L{withClass}}. To verify that the attribute exists, but without specifying a value, pass C{withAttribute.ANY_VALUE} as the value. Example:: html = '''
Some text
1 4 0 1 0
1,3 2,3 1,1
this has no type
''' div,div_end = makeHTMLTags("div") # only match div tag having a type attribute with value "grid" div_grid = div().setParseAction(withAttribute(type="grid")) grid_expr = div_grid + SkipTo(div | div_end)("body") for grid_header in grid_expr.searchString(html): print(grid_header.body) # construct a match with any div tag having a type attribute, regardless of the value div_any_type = div().setParseAction(withAttribute(type=withAttribute.ANY_VALUE)) div_expr = div_any_type + SkipTo(div | div_end)("body") for div_header in div_expr.searchString(html): print(div_header.body) prints:: 1 4 0 1 0 1 4 0 1 0 1,3 2,3 1,1 """ if args: attrs = args[:] else: attrs = attrDict.items() attrs = [(k,v) for k,v in attrs] def pa(s,l,tokens): for attrName,attrValue in attrs: if attrName not in tokens: raise ParseException(s,l,"no matching attribute " + attrName) if attrValue != withAttribute.ANY_VALUE and tokens[attrName] != attrValue: raise ParseException(s,l,"attribute '%s' has value '%s', must be '%s'" % (attrName, tokens[attrName], attrValue)) return pa withAttribute.ANY_VALUE = object() def withClass(classname, namespace=''): """ Simplified version of C{L{withAttribute}} when matching on a div class - made difficult because C{class} is a reserved word in Python. Example:: html = '''
Some text
1 4 0 1 0
1,3 2,3 1,1
this <div> has no class
''' div,div_end = makeHTMLTags("div") div_grid = div().setParseAction(withClass("grid")) grid_expr = div_grid + SkipTo(div | div_end)("body") for grid_header in grid_expr.searchString(html): print(grid_header.body) div_any_type = div().setParseAction(withClass(withAttribute.ANY_VALUE)) div_expr = div_any_type + SkipTo(div | div_end)("body") for div_header in div_expr.searchString(html): print(div_header.body) prints:: 1 4 0 1 0 1 4 0 1 0 1,3 2,3 1,1 """ classattr = "%s:class" % namespace if namespace else "class" return withAttribute(**{classattr : classname}) opAssoc = _Constants() opAssoc.LEFT = object() opAssoc.RIGHT = object() def infixNotation( baseExpr, opList, lpar=Suppress('('), rpar=Suppress(')') ): """ Helper method for constructing grammars of expressions made up of operators working in a precedence hierarchy. Operators may be unary or binary, left- or right-associative. Parse actions can also be attached to operator expressions. The generated parser will also recognize the use of parentheses to override operator precedences (see example below). Note: if you define a deep operator list, you may see performance issues when using infixNotation. See L{ParserElement.enablePackrat} for a mechanism to potentially improve your parser performance. Parameters: - baseExpr - expression representing the most basic element for the nested - opList - list of tuples, one for each operator precedence level in the expression grammar; each tuple is of the form (opExpr, numTerms, rightLeftAssoc, parseAction), where: - opExpr is the pyparsing expression for the operator; may also be a string, which will be converted to a Literal; if numTerms is 3, opExpr is a tuple of two expressions, for the two operators separating the 3 terms - numTerms is the number of terms for this operator (must be 1, 2, or 3) - rightLeftAssoc is the indicator whether the operator is right or left associative, using the pyparsing-defined constants C{opAssoc.RIGHT} and C{opAssoc.LEFT}. - parseAction is the parse action to be associated with expressions matching this operator expression (the parse action tuple member may be omitted) - lpar - expression for matching left-parentheses (default=C{Suppress('(')}) - rpar - expression for matching right-parentheses (default=C{Suppress(')')}) Example:: # simple example of four-function arithmetic with ints and variable names integer = pyparsing_common.signed_integer varname = pyparsing_common.identifier arith_expr = infixNotation(integer | varname, [ ('-', 1, opAssoc.RIGHT), (oneOf('* /'), 2, opAssoc.LEFT), (oneOf('+ -'), 2, opAssoc.LEFT), ]) arith_expr.runTests(''' 5+3*6 (5+3)*6 -2--11 ''', fullDump=False) prints:: 5+3*6 [[5, '+', [3, '*', 6]]] (5+3)*6 [[[5, '+', 3], '*', 6]] -2--11 [[['-', 2], '-', ['-', 11]]] """ ret = Forward() lastExpr = baseExpr | ( lpar + ret + rpar ) for i,operDef in enumerate(opList): opExpr,arity,rightLeftAssoc,pa = (operDef + (None,))[:4] termName = "%s term" % opExpr if arity < 3 else "%s%s term" % opExpr if arity == 3: if opExpr is None or len(opExpr) != 2: raise ValueError("if numterms=3, opExpr must be a tuple or list of two expressions") opExpr1, opExpr2 = opExpr thisExpr = Forward().setName(termName) if rightLeftAssoc == opAssoc.LEFT: if arity == 1: matchExpr = FollowedBy(lastExpr + opExpr) + Group( lastExpr + OneOrMore( opExpr ) ) elif arity == 2: if opExpr is not None: matchExpr = FollowedBy(lastExpr + opExpr + lastExpr) + Group( lastExpr + OneOrMore( opExpr + lastExpr ) ) else: matchExpr = FollowedBy(lastExpr+lastExpr) + Group( lastExpr + OneOrMore(lastExpr) ) elif arity == 3: matchExpr = FollowedBy(lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr) + \ Group( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr ) else: raise ValueError("operator must be unary (1), binary (2), or ternary (3)") elif rightLeftAssoc == opAssoc.RIGHT: if arity == 1: # try to avoid LR with this extra test if not isinstance(opExpr, Optional): opExpr = Optional(opExpr) matchExpr = FollowedBy(opExpr.expr + thisExpr) + Group( opExpr + thisExpr ) elif arity == 2: if opExpr is not None: matchExpr = FollowedBy(lastExpr + opExpr + thisExpr) + Group( lastExpr + OneOrMore( opExpr + thisExpr ) ) else: matchExpr = FollowedBy(lastExpr + thisExpr) + Group( lastExpr + OneOrMore( thisExpr ) ) elif arity == 3: matchExpr = FollowedBy(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) + \ Group( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr ) else: raise ValueError("operator must be unary (1), binary (2), or ternary (3)") else: raise ValueError("operator must indicate right or left associativity") if pa: matchExpr.setParseAction( pa ) thisExpr <<= ( matchExpr.setName(termName) | lastExpr ) lastExpr = thisExpr ret <<= lastExpr return ret operatorPrecedence = infixNotation """(Deprecated) Former name of C{L{infixNotation}}, will be dropped in a future release.""" dblQuotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"').setName("string enclosed in double quotes") sglQuotedString = Combine(Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("string enclosed in single quotes") quotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"'| Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("quotedString using single or double quotes") unicodeString = Combine(_L('u') + quotedString.copy()).setName("unicode string literal") def nestedExpr(opener="(", closer=")", content=None, ignoreExpr=quotedString.copy()): """ Helper method for defining nested lists enclosed in opening and closing delimiters ("(" and ")" are the default). Parameters: - opener - opening character for a nested list (default=C{"("}); can also be a pyparsing expression - closer - closing character for a nested list (default=C{")"}); can also be a pyparsing expression - content - expression for items within the nested lists (default=C{None}) - ignoreExpr - expression for ignoring opening and closing delimiters (default=C{quotedString}) If an expression is not provided for the content argument, the nested expression will capture all whitespace-delimited content between delimiters as a list of separate values. Use the C{ignoreExpr} argument to define expressions that may contain opening or closing characters that should not be treated as opening or closing characters for nesting, such as quotedString or a comment expression. Specify multiple expressions using an C{L{Or}} or C{L{MatchFirst}}. The default is L{quotedString}, but if no expressions are to be ignored, then pass C{None} for this argument. Example:: data_type = oneOf("void int short long char float double") decl_data_type = Combine(data_type + Optional(Word('*'))) ident = Word(alphas+'_', alphanums+'_') number = pyparsing_common.number arg = Group(decl_data_type + ident) LPAR,RPAR = map(Suppress, "()") code_body = nestedExpr('{', '}', ignoreExpr=(quotedString | cStyleComment)) c_function = (decl_data_type("type") + ident("name") + LPAR + Optional(delimitedList(arg), [])("args") + RPAR + code_body("body")) c_function.ignore(cStyleComment) source_code = ''' int is_odd(int x) { return (x%2); } int dec_to_hex(char hchar) { if (hchar >= '0' && hchar <= '9') { return (ord(hchar)-ord('0')); } else { return (10+ord(hchar)-ord('A')); } } ''' for func in c_function.searchString(source_code): print("%(name)s (%(type)s) args: %(args)s" % func) prints:: is_odd (int) args: [['int', 'x']] dec_to_hex (int) args: [['char', 'hchar']] """ if opener == closer: raise ValueError("opening and closing strings cannot be the same") if content is None: if isinstance(opener,basestring) and isinstance(closer,basestring): if len(opener) == 1 and len(closer)==1: if ignoreExpr is not None: content = (Combine(OneOrMore(~ignoreExpr + CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS,exact=1)) ).setParseAction(lambda t:t[0].strip())) else: content = (empty.copy()+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS ).setParseAction(lambda t:t[0].strip())) else: if ignoreExpr is not None: content = (Combine(OneOrMore(~ignoreExpr + ~Literal(opener) + ~Literal(closer) + CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1)) ).setParseAction(lambda t:t[0].strip())) else: content = (Combine(OneOrMore(~Literal(opener) + ~Literal(closer) + CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1)) ).setParseAction(lambda t:t[0].strip())) else: raise ValueError("opening and closing arguments must be strings if no content expression is given") ret = Forward() if ignoreExpr is not None: ret <<= Group( Suppress(opener) + ZeroOrMore( ignoreExpr | ret | content ) + Suppress(closer) ) else: ret <<= Group( Suppress(opener) + ZeroOrMore( ret | content ) + Suppress(closer) ) ret.setName('nested %s%s expression' % (opener,closer)) return ret def indentedBlock(blockStatementExpr, indentStack, indent=True): """ Helper method for defining space-delimited indentation blocks, such as those used to define block statements in Python source code. Parameters: - blockStatementExpr - expression defining syntax of statement that is repeated within the indented block - indentStack - list created by caller to manage indentation stack (multiple statementWithIndentedBlock expressions within a single grammar should share a common indentStack) - indent - boolean indicating whether block must be indented beyond the the current level; set to False for block of left-most statements (default=C{True}) A valid block must contain at least one C{blockStatement}. Example:: data = ''' def A(z): A1 B = 100 G = A2 A2 A3 B def BB(a,b,c): BB1 def BBA(): bba1 bba2 bba3 C D def spam(x,y): def eggs(z): pass ''' indentStack = [1] stmt = Forward() identifier = Word(alphas, alphanums) funcDecl = ("def" + identifier + Group( "(" + Optional( delimitedList(identifier) ) + ")" ) + ":") func_body = indentedBlock(stmt, indentStack) funcDef = Group( funcDecl + func_body ) rvalue = Forward() funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")") rvalue << (funcCall | identifier | Word(nums)) assignment = Group(identifier + "=" + rvalue) stmt << ( funcDef | assignment | identifier ) module_body = OneOrMore(stmt) parseTree = module_body.parseString(data) parseTree.pprint() prints:: [['def', 'A', ['(', 'z', ')'], ':', [['A1'], [['B', '=', '100']], [['G', '=', 'A2']], ['A2'], ['A3']]], 'B', ['def', 'BB', ['(', 'a', 'b', 'c', ')'], ':', [['BB1'], [['def', 'BBA', ['(', ')'], ':', [['bba1'], ['bba2'], ['bba3']]]]]], 'C', 'D', ['def', 'spam', ['(', 'x', 'y', ')'], ':', [[['def', 'eggs', ['(', 'z', ')'], ':', [['pass']]]]]]] """ def checkPeerIndent(s,l,t): if l >= len(s): return curCol = col(l,s) if curCol != indentStack[-1]: if curCol > indentStack[-1]: raise ParseFatalException(s,l,"illegal nesting") raise ParseException(s,l,"not a peer entry") def checkSubIndent(s,l,t): curCol = col(l,s) if curCol > indentStack[-1]: indentStack.append( curCol ) else: raise ParseException(s,l,"not a subentry") def checkUnindent(s,l,t): if l >= len(s): return curCol = col(l,s) if not(indentStack and curCol < indentStack[-1] and curCol <= indentStack[-2]): raise ParseException(s,l,"not an unindent") indentStack.pop() NL = OneOrMore(LineEnd().setWhitespaceChars("\t ").suppress()) INDENT = (Empty() + Empty().setParseAction(checkSubIndent)).setName('INDENT') PEER = Empty().setParseAction(checkPeerIndent).setName('') UNDENT = Empty().setParseAction(checkUnindent).setName('UNINDENT') if indent: smExpr = Group( Optional(NL) + #~ FollowedBy(blockStatementExpr) + INDENT + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) + UNDENT) else: smExpr = Group( Optional(NL) + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) ) blockStatementExpr.ignore(_bslash + LineEnd()) return smExpr.setName('indented block') alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]") punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]") anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_:").setName('any tag')) _htmlEntityMap = dict(zip("gt lt amp nbsp quot apos".split(),'><& "\'')) commonHTMLEntity = Regex('&(?P' + '|'.join(_htmlEntityMap.keys()) +");").setName("common HTML entity") def replaceHTMLEntity(t): """Helper parser action to replace common HTML entities with their special characters""" return _htmlEntityMap.get(t.entity) # it's easy to get these comment structures wrong - they're very common, so may as well make them available cStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/').setName("C style comment") "Comment of the form C{/* ... */}" htmlComment = Regex(r"").setName("HTML comment") "Comment of the form C{}" restOfLine = Regex(r".*").leaveWhitespace().setName("rest of line") dblSlashComment = Regex(r"//(?:\\\n|[^\n])*").setName("// comment") "Comment of the form C{// ... (to end of line)}" cppStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/'| dblSlashComment).setName("C++ style comment") "Comment of either form C{L{cStyleComment}} or C{L{dblSlashComment}}" javaStyleComment = cppStyleComment "Same as C{L{cppStyleComment}}" pythonStyleComment = Regex(r"#.*").setName("Python style comment") "Comment of the form C{# ... (to end of line)}" _commasepitem = Combine(OneOrMore(Word(printables, excludeChars=',') + Optional( Word(" \t") + ~Literal(",") + ~LineEnd() ) ) ).streamline().setName("commaItem") commaSeparatedList = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("commaSeparatedList") """(Deprecated) Predefined expression of 1 or more printable words or quoted strings, separated by commas. This expression is deprecated in favor of L{pyparsing_common.comma_separated_list}.""" # some other useful expressions - using lower-case class name since we are really using this as a namespace class pyparsing_common: """ Here are some common low-level expressions that may be useful in jump-starting parser development: - numeric forms (L{integers}, L{reals}, L{scientific notation}) - common L{programming identifiers} - network addresses (L{MAC}, L{IPv4}, L{IPv6}) - ISO8601 L{dates} and L{datetime} - L{UUID} - L{comma-separated list} Parse actions: - C{L{convertToInteger}} - C{L{convertToFloat}} - C{L{convertToDate}} - C{L{convertToDatetime}} - C{L{stripHTMLTags}} - C{L{upcaseTokens}} - C{L{downcaseTokens}} Example:: pyparsing_common.number.runTests(''' # any int or real number, returned as the appropriate type 100 -100 +100 3.14159 6.02e23 1e-12 ''') pyparsing_common.fnumber.runTests(''' # any int or real number, returned as float 100 -100 +100 3.14159 6.02e23 1e-12 ''') pyparsing_common.hex_integer.runTests(''' # hex numbers 100 FF ''') pyparsing_common.fraction.runTests(''' # fractions 1/2 -3/4 ''') pyparsing_common.mixed_integer.runTests(''' # mixed fractions 1 1/2 -3/4 1-3/4 ''') import uuid pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID)) pyparsing_common.uuid.runTests(''' # uuid 12345678-1234-5678-1234-567812345678 ''') prints:: # any int or real number, returned as the appropriate type 100 [100] -100 [-100] +100 [100] 3.14159 [3.14159] 6.02e23 [6.02e+23] 1e-12 [1e-12] # any int or real number, returned as float 100 [100.0] -100 [-100.0] +100 [100.0] 3.14159 [3.14159] 6.02e23 [6.02e+23] 1e-12 [1e-12] # hex numbers 100 [256] FF [255] # fractions 1/2 [0.5] -3/4 [-0.75] # mixed fractions 1 [1] 1/2 [0.5] -3/4 [-0.75] 1-3/4 [1.75] # uuid 12345678-1234-5678-1234-567812345678 [UUID('12345678-1234-5678-1234-567812345678')] """ convertToInteger = tokenMap(int) """ Parse action for converting parsed integers to Python int """ convertToFloat = tokenMap(float) """ Parse action for converting parsed numbers to Python float """ integer = Word(nums).setName("integer").setParseAction(convertToInteger) """expression that parses an unsigned integer, returns an int""" hex_integer = Word(hexnums).setName("hex integer").setParseAction(tokenMap(int,16)) """expression that parses a hexadecimal integer, returns an int""" signed_integer = Regex(r'[+-]?\d+').setName("signed integer").setParseAction(convertToInteger) """expression that parses an integer with optional leading sign, returns an int""" fraction = (signed_integer().setParseAction(convertToFloat) + '/' + signed_integer().setParseAction(convertToFloat)).setName("fraction") """fractional expression of an integer divided by an integer, returns a float""" fraction.addParseAction(lambda t: t[0]/t[-1]) mixed_integer = (fraction | signed_integer + Optional(Optional('-').suppress() + fraction)).setName("fraction or mixed integer-fraction") """mixed integer of the form 'integer - fraction', with optional leading integer, returns float""" mixed_integer.addParseAction(sum) real = Regex(r'[+-]?\d+\.\d*').setName("real number").setParseAction(convertToFloat) """expression that parses a floating point number and returns a float""" sci_real = Regex(r'[+-]?\d+([eE][+-]?\d+|\.\d*([eE][+-]?\d+)?)').setName("real number with scientific notation").setParseAction(convertToFloat) """expression that parses a floating point number with optional scientific notation and returns a float""" # streamlining this expression makes the docs nicer-looking number = (sci_real | real | signed_integer).streamline() """any numeric expression, returns the corresponding Python type""" fnumber = Regex(r'[+-]?\d+\.?\d*([eE][+-]?\d+)?').setName("fnumber").setParseAction(convertToFloat) """any int or real number, returned as float""" identifier = Word(alphas+'_', alphanums+'_').setName("identifier") """typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')""" ipv4_address = Regex(r'(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})){3}').setName("IPv4 address") "IPv4 address (C{0.0.0.0 - 255.255.255.255})" _ipv6_part = Regex(r'[0-9a-fA-F]{1,4}').setName("hex_integer") _full_ipv6_address = (_ipv6_part + (':' + _ipv6_part)*7).setName("full IPv6 address") _short_ipv6_address = (Optional(_ipv6_part + (':' + _ipv6_part)*(0,6)) + "::" + Optional(_ipv6_part + (':' + _ipv6_part)*(0,6))).setName("short IPv6 address") _short_ipv6_address.addCondition(lambda t: sum(1 for tt in t if pyparsing_common._ipv6_part.matches(tt)) < 8) _mixed_ipv6_address = ("::ffff:" + ipv4_address).setName("mixed IPv6 address") ipv6_address = Combine((_full_ipv6_address | _mixed_ipv6_address | _short_ipv6_address).setName("IPv6 address")).setName("IPv6 address") "IPv6 address (long, short, or mixed form)" mac_address = Regex(r'[0-9a-fA-F]{2}([:.-])[0-9a-fA-F]{2}(?:\1[0-9a-fA-F]{2}){4}').setName("MAC address") "MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)" @staticmethod def convertToDate(fmt="%Y-%m-%d"): """ Helper to create a parse action for converting parsed date string to Python datetime.date Params - - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%d"}) Example:: date_expr = pyparsing_common.iso8601_date.copy() date_expr.setParseAction(pyparsing_common.convertToDate()) print(date_expr.parseString("1999-12-31")) prints:: [datetime.date(1999, 12, 31)] """ def cvt_fn(s,l,t): try: return datetime.strptime(t[0], fmt).date() except ValueError as ve: raise ParseException(s, l, str(ve)) return cvt_fn @staticmethod def convertToDatetime(fmt="%Y-%m-%dT%H:%M:%S.%f"): """ Helper to create a parse action for converting parsed datetime string to Python datetime.datetime Params - - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%dT%H:%M:%S.%f"}) Example:: dt_expr = pyparsing_common.iso8601_datetime.copy() dt_expr.setParseAction(pyparsing_common.convertToDatetime()) print(dt_expr.parseString("1999-12-31T23:59:59.999")) prints:: [datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)] """ def cvt_fn(s,l,t): try: return datetime.strptime(t[0], fmt) except ValueError as ve: raise ParseException(s, l, str(ve)) return cvt_fn iso8601_date = Regex(r'(?P\d{4})(?:-(?P\d\d)(?:-(?P\d\d))?)?').setName("ISO8601 date") "ISO8601 date (C{yyyy-mm-dd})" iso8601_datetime = Regex(r'(?P\d{4})-(?P\d\d)-(?P\d\d)[T ](?P\d\d):(?P\d\d)(:(?P\d\d(\.\d*)?)?)?(?PZ|[+-]\d\d:?\d\d)?').setName("ISO8601 datetime") "ISO8601 datetime (C{yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)}) - trailing seconds, milliseconds, and timezone optional; accepts separating C{'T'} or C{' '}" uuid = Regex(r'[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}').setName("UUID") "UUID (C{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx})" _html_stripper = anyOpenTag.suppress() | anyCloseTag.suppress() @staticmethod def stripHTMLTags(s, l, tokens): """ Parse action to remove HTML tags from web page HTML source Example:: # strip HTML links from normal text text = 'More info at the pyparsing wiki page' td,td_end = makeHTMLTags("TD") table_text = td + SkipTo(td_end).setParseAction(pyparsing_common.stripHTMLTags)("body") + td_end print(table_text.parseString(text).body) # -> 'More info at the pyparsing wiki page' """ return pyparsing_common._html_stripper.transformString(tokens[0]) _commasepitem = Combine(OneOrMore(~Literal(",") + ~LineEnd() + Word(printables, excludeChars=',') + Optional( White(" \t") ) ) ).streamline().setName("commaItem") comma_separated_list = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("comma separated list") """Predefined expression of 1 or more printable words or quoted strings, separated by commas.""" upcaseTokens = staticmethod(tokenMap(lambda t: _ustr(t).upper())) """Parse action to convert tokens to upper case.""" downcaseTokens = staticmethod(tokenMap(lambda t: _ustr(t).lower())) """Parse action to convert tokens to lower case.""" if __name__ == "__main__": selectToken = CaselessLiteral("select") fromToken = CaselessLiteral("from") ident = Word(alphas, alphanums + "_$") columnName = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens) columnNameList = Group(delimitedList(columnName)).setName("columns") columnSpec = ('*' | columnNameList) tableName = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens) tableNameList = Group(delimitedList(tableName)).setName("tables") simpleSQL = selectToken("command") + columnSpec("columns") + fromToken + tableNameList("tables") # demo runTests method, including embedded comments in test string simpleSQL.runTests(""" # '*' as column list and dotted table name select * from SYS.XYZZY # caseless match on "SELECT", and casts back to "select" SELECT * from XYZZY, ABC # list of column names, and mixed case SELECT keyword Select AA,BB,CC from Sys.dual # multiple tables Select A, B, C from Sys.dual, Table2 # invalid SELECT keyword - should fail Xelect A, B, C from Sys.dual # incomplete command - should fail Select # invalid column name - should fail Select ^^^ frox Sys.dual """) pyparsing_common.number.runTests(""" 100 -100 +100 3.14159 6.02e23 1e-12 """) # any int or real number, returned as float pyparsing_common.fnumber.runTests(""" 100 -100 +100 3.14159 6.02e23 1e-12 """) pyparsing_common.hex_integer.runTests(""" 100 FF """) import uuid pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID)) pyparsing_common.uuid.runTests(""" 12345678-1234-5678-1234-567812345678 """) pyparsing-2.1.10/pyparsingClassDiagram.JPG0000666000000000000000000071556211170740057016614 0ustar 00000000000000JFIFC    $.' 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The pyparsing module provides a library of classes that client code uses to construct the grammar directly in Python code. Here is a program to parse "Hello, World!" (or any greeting of the form ", !"): from pyparsing import Word, alphas greet = Word( alphas ) + "," + Word( alphas ) + "!" hello = "Hello, World!" print hello, "->", greet.parseString( hello ) The program outputs the following: Hello, World! -> ['Hello', ',', 'World', '!'] The Python representation of the grammar is quite readable, owing to the self-explanatory class names, and the use of '+', '|' and '^' operator definitions. The parsed results returned from parseString() can be accessed as a nested list, a dictionary, or an object with named attributes. The pyparsing module handles some of the problems that are typically vexing when writing text parsers: - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello , World !", etc.) - quoted strings - embedded comments The .zip file includes examples of a simple SQL parser, simple CORBA IDL parser, a config file parser, a chemical formula parser, and a four- function algebraic notation parser. It also includes a simple how-to document, and a UML class diagram of the library's classes. Installation ============ Do the usual: python setup.py install (pyparsing requires Python 2.6 or later.) Or corresponding commands using pip, easy_install, or wheel: pip install pyparsing easy_install pyparsing wheel install pyparsing Documentation ============= See: HowToUsePyparsing.html License ======= MIT License. See header of pyparsing.py History ======= See CHANGES file. pyparsing-2.1.10/robots.txt0000666000000000000000000000004310426670530014012 0ustar 00000000000000User-agent: * Disallow: /htmldoc pyparsing-2.1.10/setup.cfg0000666000000000000000000000017212775575715013607 0ustar 00000000000000[bdist_wheel] universal = 1 [wheel] universal = 1 [egg_info] tag_build = tag_date = 0 tag_svn_revision = 0 pyparsing-2.1.10/setup.py0000666000000000000000000000236212614333413013456 0ustar 00000000000000#!/usr/bin/env python """Setup script for the pyparsing module distribution.""" from setuptools import setup import sys import os from pyparsing import __version__ as pyparsing_version modules = ["pyparsing",] setup(# Distribution meta-data name = "pyparsing", version = pyparsing_version, description = "Python parsing module", author = "Paul McGuire", author_email = "ptmcg@users.sourceforge.net", url = "http://pyparsing.wikispaces.com/", download_url = "http://sourceforge.net/project/showfiles.php?group_id=97203", license = "MIT License", py_modules = modules, classifiers=[ 'Development Status :: 5 - Production/Stable', 'Intended Audience :: Developers', 'Intended Audience :: Information Technology', 'License :: OSI Approved :: MIT License', 'Operating System :: OS Independent', 'Programming Language :: Python', 'Programming Language :: Python :: 2.6', 'Programming Language :: Python :: 2.7', 'Programming Language :: Python :: 3', 'Programming Language :: Python :: 3.3', 'Programming Language :: Python :: 3.4', 'Programming Language :: Python :: 3.5', ] )