th-lift-0.7.6/src/0000755000000000000000000000000012622155143012051 5ustar0000000000000000th-lift-0.7.6/src/Language/0000755000000000000000000000000012622155143013574 5ustar0000000000000000th-lift-0.7.6/src/Language/Haskell/0000755000000000000000000000000012622155143015157 5ustar0000000000000000th-lift-0.7.6/src/Language/Haskell/TH/0000755000000000000000000000000012647220350015472 5ustar0000000000000000th-lift-0.7.6/t/0000755000000000000000000000000012623361523011527 5ustar0000000000000000th-lift-0.7.6/src/Language/Haskell/TH/Lift.hs0000644000000000000000000002171512647220350016732 0ustar0000000000000000{-# LANGUAGE CPP #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE MagicHash #-} {-# LANGUAGE TemplateHaskell #-} {-# LANGUAGE TypeSynonymInstances #-} {-# OPTIONS_GHC -fno-warn-orphans #-} module Language.Haskell.TH.Lift ( deriveLift , deriveLiftMany , deriveLift' , deriveLiftMany' , makeLift , makeLift' , Lift(..) ) where #if !(MIN_VERSION_template_haskell(2,4,0)) import Data.PackedString (PackedString, packString, unpackPS) #endif /* MIN_VERSION_template_haskell(2,4,0) */ import GHC.Base (unpackCString#) import GHC.Exts (Double(..), Float(..), Int(..), Word(..)) import GHC.Prim (Addr#, Double#, Float#, Int#, Word#) #if MIN_VERSION_template_haskell(2,11,0) import GHC.Exts (Char(..)) import GHC.Prim (Char#) #endif /* !(MIN_VERSION_template_haskell(2,11,0)) */ #if MIN_VERSION_template_haskell(2,8,0) import Data.Char (ord) #endif /* !(MIN_VERSION_template_haskell(2,8,0)) */ #if !(MIN_VERSION_template_haskell(2,10,0)) import Data.Ratio (Ratio) #endif /* !(MIN_VERSION_template_haskell(2,10,0)) */ import Language.Haskell.TH import Language.Haskell.TH.Syntax import Control.Monad ((<=<), zipWithM) #if MIN_VERSION_template_haskell(2,9,0) import Data.Maybe (catMaybes) #endif /* MIN_VERSION_template_haskell(2,9,0) */ modName :: String modName = "Language.Haskell.TH.Lift" -- | Derive Lift instances for the given datatype. deriveLift :: Name -> Q [Dec] deriveLift = deriveLift' <=< reify -- | Derive Lift instances for many datatypes. deriveLiftMany :: [Name] -> Q [Dec] deriveLiftMany = deriveLiftMany' <=< mapM reify -- | Obtain Info values through a custom reification function. This is useful -- when generating instances for datatypes that have not yet been declared. deriveLift' :: Info -> Q [Dec] deriveLift' = fmap (:[]) . deriveLiftOne deriveLiftMany' :: [Info] -> Q [Dec] deriveLiftMany' = mapM deriveLiftOne -- | Generates a lambda expresson which behaves like 'lift' (without requiring -- a 'Lift' instance). Example: -- -- @ -- newtype Fix f = In { out :: f (Fix f) } -- -- instance Lift (f (Fix f)) => Lift (Fix f) where -- lift = $(makeLift ''Fix) -- @ makeLift :: Name -> Q Exp makeLift = makeLift' <=< reify -- | Like 'makeLift', but using a custom reification function. makeLift' :: Info -> Q Exp makeLift' i = withInfo i $ \_ n _ cons -> makeLiftOne n cons deriveLiftOne :: Info -> Q Dec deriveLiftOne i = withInfo i liftInstance where liftInstance dcx n vs cons = do #if MIN_VERSION_template_haskell(2,9,0) roles <- qReifyRoles n -- Compute the set of phantom variables. let phvars = catMaybes $ zipWith (\v role -> if role == PhantomR then Just v else Nothing) vs roles #else /* MIN_VERSION_template_haskell(2,9,0) */ let phvars = [] #endif instanceD (ctxt dcx phvars vs) (conT ''Lift `appT` typ n (map fst vs)) [funD 'lift [clause [] (normalB (makeLiftOne n cons)) []]] typ n = foldl appT (conT n) . map varT -- Only consider *-kinded type variables, because Lift instances cannot -- meaningfully be given to types of other kinds. Further, filter out type -- variables that are obviously phantom. ctxt dcx phvars = fmap (dcx ++) . cxt . concatMap liftPred . filter (`notElem` phvars) #if MIN_VERSION_template_haskell(2,10,0) liftPred (v, StarT) = [conT ''Lift `appT` varT v] liftPred (_, _) = [] #elif MIN_VERSION_template_haskell(2,8,0) liftPred (v, StarT) = [classP ''Lift [varT v]] liftPred (_, _) = [] #elif MIN_VERSION_template_haskell(2,4,0) liftPred (v, StarK) = [classP ''Lift [varT v]] liftPred (_, _) = [] #else /* !(MIN_VERSION_template_haskell(2,4,0)) */ liftPred n = conT ''Lift `appT` varT n #endif makeLiftOne :: Name -> [Con] -> Q Exp makeLiftOne n cons = do e <- newName "e" lam1E (varP e) $ caseE (varE e) $ consMatches n cons consMatches :: Name -> [Con] -> [Q Match] consMatches n [] = [match wildP (normalB e) []] where e = [| errorQExp $(stringE ("Can't lift value of empty datatype " ++ nameBase n)) |] consMatches _ cons = concatMap doCons cons doCons :: Con -> [Q Match] doCons (NormalC c sts) = (:[]) $ do ns <- zipWithM (\_ i -> newName ('x':show (i :: Int))) sts [0..] let con = [| conE c |] args = [ liftVar n t | (n, (_, t)) <- zip ns sts ] e = foldl (\e1 e2 -> [| appE $e1 $e2 |]) con args match (conP c (map varP ns)) (normalB e) [] doCons (RecC c sts) = doCons $ NormalC c [(s, t) | (_, s, t) <- sts] doCons (InfixC sty1 c sty2) = (:[]) $ do x0 <- newName "x0" x1 <- newName "x1" let con = [| conE c |] left = liftVar x0 (snd sty1) right = liftVar x1 (snd sty2) e = [| infixApp $left $con $right |] match (infixP (varP x0) c (varP x1)) (normalB e) [] doCons (ForallC _ _ c) = doCons c #if MIN_VERSION_template_haskell(2,11,0) -- GADTs can have multiple constructor names, when they are written like: -- -- data T where -- MkT1, MkT2 :: T doCons (GadtC cs sts _) = map (\c -> do ns <- zipWithM (\_ i -> newName ('x':show (i :: Int))) sts [0..] let con = [| conE c |] args = [ liftVar n t | (n, (_, t)) <- zip ns sts ] e = foldl (\e1 e2 -> [| appE $e1 $e2 |]) con args match (conP c (map varP ns)) (normalB e) [] ) cs doCons (RecGadtC cs sts _) = concatMap (\c -> doCons $ NormalC c [(s,t) | (_, s, t) <- sts]) cs #endif liftVar :: Name -> Type -> Q Exp liftVar varName (ConT tyName) #if MIN_VERSION_template_haskell(2,8,0) | tyName == ''Addr# = [| litE (stringPrimL (map (fromIntegral . ord) (unpackCString# $var))) |] #else /* !(MIN_VERSION_template_haskell(2,8,0)) */ | tyName == ''Addr# = [| litE (stringPrimL (unpackCString# $var)) |] #endif #if MIN_VERSION_template_haskell(2,11,0) | tyName == ''Char# = [| litE (charPrimL (C# $var)) |] #endif /* !(MIN_VERSION_template_haskell(2,11,0)) */ | tyName == ''Double# = [| litE (doublePrimL (toRational (D# $var))) |] | tyName == ''Float# = [| litE (floatPrimL (toRational (F# $var))) |] | tyName == ''Int# = [| litE (intPrimL (toInteger (I# $var))) |] | tyName == ''Word# = [| litE (wordPrimL (toInteger (W# $var))) |] where var :: Q Exp var = varE varName liftVar varName _ = [| lift $(varE varName) |] withInfo :: Info #if MIN_VERSION_template_haskell(2,4,0) -> (Cxt -> Name -> [(Name, Kind)] -> [Con] -> Q a) #else /* !(MIN_VERSION_template_haskell(2,4,0)) */ -> (Cxt -> Name -> [Name] -> [Con] -> Q a) #endif -> Q a withInfo i f = case i of #if MIN_VERSION_template_haskell(2,11,0) TyConI (DataD dcx n vsk _ cons _) -> f dcx n (map unTyVarBndr vsk) cons TyConI (NewtypeD dcx n vsk _ con _) -> f dcx n (map unTyVarBndr vsk) [con] #else TyConI (DataD dcx n vsk cons _) -> f dcx n (map unTyVarBndr vsk) cons TyConI (NewtypeD dcx n vsk con _) -> f dcx n (map unTyVarBndr vsk) [con] #endif _ -> error (modName ++ ".deriveLift: unhandled: " ++ pprint i) where #if MIN_VERSION_template_haskell(2,8,0) unTyVarBndr (PlainTV v) = (v, StarT) unTyVarBndr (KindedTV v k) = (v, k) #elif MIN_VERSION_template_haskell(2,4,0) unTyVarBndr (PlainTV v) = (v, StarK) unTyVarBndr (KindedTV v k) = (v, k) #else /* !(MIN_VERSION_template_haskell(2,4,0)) */ unTyVarBndr :: Name -> Name unTyVarBndr v = v #endif -- A type-restricted version of error that ensures makeLift always returns a -- value of type Q Exp, even when used on an empty datatype. errorQExp :: String -> Q Exp errorQExp = error {-# INLINE errorQExp #-} instance Lift Name where lift (Name occName nameFlavour) = [| Name occName nameFlavour |] #if MIN_VERSION_template_haskell(2,4,0) instance Lift OccName where lift n = [| mkOccName $(lift $ occString n) |] instance Lift PkgName where lift n = [| mkPkgName $(lift $ pkgString n) |] instance Lift ModName where lift n = [| mkModName $(lift $ modString n) |] #else /* MIN_VERSION_template_haskell(2,4,0) */ instance Lift PackedString where lift ps = [| packString $(lift $ unpackPS ps) |] #endif /* MIN_VERSION_template_haskell(2,4,0) */ instance Lift NameFlavour where lift NameS = [| NameS |] lift (NameQ modnam) = [| NameQ modnam |] #if __GLASGOW_HASKELL__ >= 710 lift (NameU i) = [| NameU i |] lift (NameL i) = [| NameL i |] #else /* __GLASGOW_HASKELL__ < 710 */ lift (NameU i) = [| case $( lift (I# i) ) of I# i' -> NameU i' |] lift (NameL i) = [| case $( lift (I# i) ) of I# i' -> NameL i' |] #endif /* __GLASGOW_HASKELL__ < 710 */ lift (NameG nameSpace pkgName modnam) = [| NameG nameSpace pkgName modnam |] instance Lift NameSpace where lift VarName = [| VarName |] lift DataName = [| DataName |] lift TcClsName = [| TcClsName |] #if !(MIN_VERSION_template_haskell(2,10,0)) -- These instances should really go in the template-haskell package. instance Lift () where lift _ = [| () |] instance Integral a => Lift (Ratio a) where lift x = return (LitE (RationalL (toRational x))) #endif th-lift-0.7.6/t/Test.hs0000644000000000000000000000076712623361523013014 0ustar0000000000000000{-# LANGUAGE CPP #-} {-# LANGUAGE MagicHash #-} {-# LANGUAGE TemplateHaskell #-} module Main (main) where import Foo import Language.Haskell.TH.Syntax main :: IO () main = do print $( lift (Foo "str1" 'c') ) print $( lift (Bar "str2") ) print $( lift (Rec {field = 'a'}) ) print $( lift (Unboxed #if MIN_VERSION_template_haskell(2,11,0) 'a'# #endif 1.0## 1.0# 1# 1##) ) print $( lift (In { out = Nothing }) ) th-lift-0.7.6/t/Foo.hs0000644000000000000000000000231012623361523012602 0ustar0000000000000000{-# LANGUAGE CPP #-} {-# LANGUAGE EmptyDataDecls #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE MagicHash #-} {-# LANGUAGE StandaloneDeriving #-} {-# LANGUAGE TemplateHaskell #-} {-# LANGUAGE UndecidableInstances #-} module Foo where import GHC.Prim (Double#, Float#, Int#, Word#) #if MIN_VERSION_template_haskell(2,11,0) import GHC.Prim (Char#) #endif import Language.Haskell.TH.Lift -- Phantom type parameters can't be dealt with poperly on GHC < 7.8. #if MIN_VERSION_template_haskell(2,9,0) data (Eq a) => Foo a b = Foo a Char | Bar a #else data (Eq a) => Foo a = Foo a Char | Bar a #endif deriving Show newtype Rec a = Rec { field :: a } deriving Show data Empty a data Unboxed = Unboxed { -- Template Haskell couldn't handle unlifted chars on GHC < 8.0 #if MIN_VERSION_template_haskell(2,11,0) primChar :: Char#, #endif primDouble :: Double#, primFloat :: Float#, primInt :: Int#, primWord :: Word# } deriving Show newtype Fix f = In { out :: f (Fix f) } deriving instance Show (f (Fix f)) => Show (Fix f) $(deriveLift ''Foo) $(deriveLift ''Rec) $(deriveLift ''Empty) $(deriveLift ''Unboxed) instance Lift (f (Fix f)) => Lift (Fix f) where lift = $(makeLift ''Fix) th-lift-0.7.6/COPYING0000644000000000000000000000022012622155143012307 0ustar0000000000000000 Copyright (c) Ian Lynagh, 2006. This package can be used under either the GPL v2, as in ./GPL-2, or the 3-clause BSD, as in ./BSD3, license. th-lift-0.7.6/BSD30000644000000000000000000000262112622155143011701 0ustar0000000000000000Copyright (c) Ian Lynagh. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. 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. 3. The names of the author may not be used to endorse or promote products derived from this software without specific prior written permission. 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IN NO EVENT SHALL THE REGENTS 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. th-lift-0.7.6/GPL-20000644000000000000000000004311012622155143011765 0ustar0000000000000000 GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. 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If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. th-lift-0.7.6/Setup.hs0000644000000000000000000000013112622155143012711 0ustar0000000000000000 module Main (main) where import Distribution.Simple main :: IO () main = defaultMain th-lift-0.7.6/th-lift.cabal0000644000000000000000000000307412647221203013617 0ustar0000000000000000Name: th-lift Version: 0.7.6 Cabal-Version: >= 1.8 License: BSD3 License-Files: COPYING, BSD3, GPL-2 Copyright: © 2006 Ian Lynagh, © 2010-2014 Mathieu Boespflug Author: Ian Lynagh Maintainer: Mathieu Boespflug Homepage: http://github.com/mboes/th-lift Synopsis: Derive Template Haskell's Lift class for datatypes. Description: Derive Template Haskell's Lift class for datatypes. Category: Language Tested-With: GHC==7.4.2, GHC==7.6.3, GHC==7.8.4, GHC==7.10.2 build-type: Simple Extra-source-files: Changelog source-repository head type: git location: git://github.com/mboes/th-lift Library Exposed-modules: Language.Haskell.TH.Lift Extensions: CPP, TemplateHaskell, MagicHash, TypeSynonymInstances, FlexibleInstances Hs-Source-Dirs: src Build-Depends: base >= 3 && < 5, ghc-prim ghc-options: -Wall if impl(ghc < 6.12) Build-Depends: packedstring == 0.1.*, template-haskell >= 2.2 && < 2.4 else Build-Depends: template-haskell >= 2.4 && < 2.12 Test-Suite test Type: exitcode-stdio-1.0 Main-Is: Test.hs Hs-Source-Dirs: t other-modules: Foo ghc-options: -Wall Build-Depends: base >= 3 && < 5, ghc-prim, th-lift if impl(ghc < 6.12) Build-Depends: packedstring == 0.1.*, template-haskell >= 2.2 && < 2.4 else Build-Depends: template-haskell >= 2.4 && < 2.12 th-lift-0.7.6/Changelog0000644000000000000000000000317012647220427013102 0ustar00000000000000002015-01-18 Mathieu Boespflug * GHC 8.1 compatibility. 2015-11-19 Mathieu Boespflug * Added makeLift, for cases when it's necessary to write the instance manually. (Thanks to Ryan Scott). * Support empty datatypes and unboxed types. 2014-12-07 Mathieu Boespflug * Support GHC 7.9 and hopefully 7.10, thanks to Richard Eisenberg. * On versions of GHC that support role inference, don't constrain phantom type variables. * Get rid of some orphan instances when using GHC >= 7.9. 2013-12-09 Mathieu Boespflug * Support GHC 7.8, thanks to Michael Snoyberg. * Support existentially quantified type variables in datatype declarations. * Handle exotic kinds properly. 2010-09-19 Mathieu Boespflug * Support older GHCs and Cabal, thanks to Ben Millwood. 2010-08-05 Mathieu Boespflug * Support for contexts in datatypes, thanks to Ben Millwood. * deriveLiftWith becomes deriveLift' and takes an Info structure rather than a custom reification function. * Add deriveLiftMany to derive many Lift instances in one go. 2010-08-02 Mathieu Boespflug * Add support for newtypes and records syntax, thanks to a patch by Ben Millwood. * Add support for infix constructors. * deriveLift returns a list of declarations. * New deriveLiftWith function with custom reification, following a feature request by Jonas Duregård. 2010-03-24 Mathieu Boespflug * Port to Template Haskell 2.4. * Maintainer is now Mathieu Boespflug. 2006-09-06 Ian Lynagh * Initial release.