thorn 0.1 → 0.1.0.1
raw patch · 6 files changed
+390/−336 lines, 6 files
Files
- Data/Thorn/Fmap.hs +170/−0
- Data/Thorn/Fold.hs +44/−0
- Data/Thorn/Internal.hs +131/−0
- Data/Thorn/Zipper.hs +15/−0
- LICENSE +24/−333
- thorn.cabal +6/−3
+ Data/Thorn/Fmap.hs view
@@ -0,0 +1,170 @@+{-# LANGUAGE TemplateHaskell, ViewPatterns #-} + +-- | +-- The module Data.Thorn.Fmap +module Data.Thorn.Fmap ( + autofmap + , Variance(..) + , autovariance, autovarianceRaw, autofunctorize + ) where + +import Data.Thorn.Internal +import Language.Haskell.TH +import Data.List +import Data.Maybe +import qualified Data.Sequence as S +import qualified Data.Foldable as F +import Control.Monad +import Control.Applicative +import Control.Monad.State +import Data.Monoid +import Data.Functor +import Data.Functor.Contravariant +import Data.Bifunctor +import Data.Profunctor + +-- | +-- @autofmap t@ generates the @fmap@ of the type @t@. +-- +-- Quite surprisingly, it still works for any arities, co\/contra\/free\/fixed-variances, partially applied types, type synonyms, and mutual recursions. +-- +-- @ +--type Nuf x y = y -> x +--type a :<- b = Nuf a b +--nuf = $(autofmap [t|(:<-)|]) chr ord (+1) 'c' +-- +--data List a = Nil | Cons a (List a) deriving Show +--golist 0 = Nil +--golist n = Cons n (golist (n-1)) +--list = $(autofmap $[t|List|]) (+1) (golist 10) +-- +--data Rose a = Rose a (Forest a) deriving Show +--data Forest a = Forest [Rose a] deriving Show +--gorose n = Rose n (Forest (replicate n (gorose (n-1)))) +--rose = $(autofmap $[t|Rose|]) (+1) (gorose 3) +-- @ +autofmap :: TypeQ -> ExpQ +autofmap t = do + (n,tx) <- t >>= normalizeType [] [] >>= apply 0 + (e,txnmes) <- runStateT (autofmap' tx) [] + return $ LamE (map newFuncP [0..n-1]) (LetE (fmap (\(tx,nm,Just e) -> ValD (VarP nm) (NormalB e) []) txnmes) e) + +apply :: Int -> Typex -> Q (Int,Typex) +apply n (FuncTx f) = f (SpecialTx n) >>= apply (n+1) +apply n tx@(VarTx _) = return (n,tx) +apply n tx@(DataTx _ _ _) = return (n,tx) +apply n tx@(SeenDataTx _ _) = return (n,tx) +apply n tx@(TupleTx _) = return (n,tx) +apply n tx@(ArrowTx _ _) = return (n,tx) +apply n tx@(ListTx _) = return (n,tx) + +autofmap',autofmap'' :: Typex -> StateT [(Typex,Name,Maybe Exp)] Q Exp +autofmap' tx = do + txnmes <- get + case find (\(tx',_,_)->tx==tx') txnmes of + Just (_,nm,_) -> return (VarE nm) + Nothing -> autofmap'' tx +autofmap'' (VarTx _) = return $ mkNameE "id" +autofmap'' (BasicTx _) = return $ mkNameE "id" +autofmap'' (FuncTx _) = fail "Automap doesn't accept such a type with a kind * -> k." +autofmap'' (DataTx nm vmp cxs) = do + txnmes <- get + put ((tx0, newFmap (length txnmes), Nothing) : txnmes) + e <- LamE [newVarP 0] <$> (CaseE (newVarE 0) <$> (mapM go cxs)) + txnmes' <- get + put $ map (\(tx,nm,e') -> if tx==tx0 then (tx,nm,Just e) else (tx,nm,e')) txnmes' + return e + where go (NormalCx nm txs) = do + es <- autofmapmap txs + return $ Match (ConP nm (map newVarP [0..length txs-1])) (NormalB (apps (ConE nm) es)) [] + go (InfixCx nm txa txb) = do + [ea,eb] <- autofmapmap [txa,txb] + return $ Match (InfixP (newVarP 0) nm (newVarP 1)) (NormalB (InfixE (Just ea) (ConE nm) (Just eb))) [] + tx0 = SeenDataTx nm vmp +autofmap'' (SeenDataTx nm vmp) = fail "Autofmap doesn't work well, sorry." +autofmap'' (TupleTx txs) = do + es <- autofmapmap txs + return $ LamE [TupP (map newVarP [0..length txs-1])] (TupE es) + where go i tx = autofmap' tx >>= \e -> return $ AppE e (newVarE i) +autofmap'' (ArrowTx txa txb) = do + fa <- autofmap' txa + fb <- autofmap' txb + return $ LamE [newVarP 0, newVarP 1] (AppE fb (AppE (newVarE 0) (AppE fa (newVarE 1)))) +autofmap'' (ListTx tx) = autofmap' tx >>= \f -> return $ AppE (mkNameE "map") f +autofmap'' (SpecialTx n) = return $ newFuncE n + +autofmapmap txs = mapM (\(i,tx) -> autofmap' tx >>= \e -> return $ AppE e (newVarE i)) (zip [0 .. length txs - 1] txs) + +-- | +-- @Variance@ is a variance of a parameter of a functor. +data Variance = + -- | Covariance, one of a normal functor. + Co + -- | Contravariance, a dual of covariance. + | Contra + -- | Free-variance, or novariance, being supposed to satisfy either covariance or contravariance. + | Free + -- | Fixed-variance, or invariance, being suppoesed to satisfy both covariance and contravariance. + | Fixed deriving (Show, Read) + +-- | @v1 `mappend` v2@ means to be supposed to satisfy both @v1@ and @v2@. +instance Monoid Variance where + Free `mappend` v = v + v `mappend` Free = v + Fixed `mappend` _ = Fixed + _ `mappend` Fixed = Fixed + Co `mappend` Contra = Fixed + Contra `mappend` Co = Fixed + mempty = Free + +neg :: Variance -> Variance +neg Co = Contra +neg Contra = Co +neg Free = Free +neg Fixed = Fixed + +-- | +-- @autovariance t@ provides the variances of the type @t@. +autovariance :: TypeQ -> ExpQ +autovariance t = do + vs <- autovarianceRaw t + return $ ListE (map go vs) + where go Co = mkNameCE "Co" + go Contra = mkNameCE "Contra" + go Free = mkNameCE "Free" + go Fixed = mkNameCE "Fixed" + +autovarianceRaw :: TypeQ -> Q [Variance] +autovarianceRaw t = do + (n,tx) <- t >>= normalizeType [] [] >>= apply 0 + (_,seq) <- runStateT (autovariance' Co [] tx) (S.replicate n Free) + return $ (F.toList seq) + +autovariance' :: Variance -> [(Name,[Conx])] -> Typex -> StateT (S.Seq Variance) Q () +autovariance' v dts (SpecialTx n) = do + seq <- get + put $ S.adjust (<>v) n seq +autovariance' v dts (VarTx _) = return () +autovariance' v dts (FuncTx _) = fail "Automap doesn't accept such a type with a kind * -> k." +autovariance' v dts (DataTx nm _ cxs) = mapM_ (mapM_ (autovariance' v ((nm,cxs):dts)) . cxtxs) cxs +autovariance' v dts (SeenDataTx nm _) = return () +autovariance' v dts (TupleTx txs) = mapM_ (autovariance' v dts) txs +autovariance' v dts (ArrowTx txa txb) = autovariance' (neg v) dts txa >> autovariance' v dts txb +autovariance' v dts (ListTx tx) = autovariance' v dts tx + +-- | +-- @autofunctorize t@ provides an instance delcaration of the type @t@ for the suitable functor class : Funtor, Contravariant, Bifunctor, or Profunctor +autofunctorize :: TypeQ -> DecsQ +autofunctorize t = do + vs <- autovarianceRaw t + case vs of + [Co] -> go (mkName "Functor") (mkName "fmap") + [Contra] -> go (mkName "Contravariant") (mkName "contramap") + [Co,Co] -> go (mkName "Bifunctor") (mkName "bimap") + [Contra,Co] -> go (mkName "Profunctor") (mkName "dimap") + _ -> fail "autofunctorize doesn't know the suitable functor class for this variance" + where go cls member = do + e <- autofmap t + t' <- t + return [InstanceD [] (AppT (ConT cls) t') [ValD (VarP member) (NormalB e) []]] +
+ Data/Thorn/Fold.hs view
@@ -0,0 +1,44 @@+{-# LANGUAGE TemplateHaskell, ViewPatterns #-} + +-- | +-- The module Data.Thorn.Fold +module Data.Thorn.Fold ( + unfixdata + , autofold, autoMutualFold + , autounfold, autoMutualUnfold + ) where + +import Data.Thorn.Internal +import Language.Haskell.TH +import Data.List +import Data.Maybe +import Control.Monad +import Control.Applicative +import Control.Monad.State +import Data.Monoid + +-- | +-- @unfixdata t@ provides a declaration of a data whose fixpoint is the recursive type @t@. +unfixdata :: TypeQ -> DecsQ +unfixdata t = do fail "oh" + +-- | +-- @autofold t@ provides a folding function for the recursive type @t@. +autofold :: TypeQ -> ExpQ +autofold t = do fail "oh" + +-- | +-- @autoMutualFold ts@ provides a folding function for the mutually recursive types @ts@. +autoMutualFold :: [TypeQ] -> ExpQ +autoMutualFold ts = do fail "oh" + +-- | +-- @autounfold t@ provides an unfolding function for the recursive type @t@. +autounfold :: TypeQ -> ExpQ +autounfold t = do fail "oh" + +-- | +-- @autoMutualUnfold ts@ provides an unfolding function for the mutually recursive types @ts@. +autoMutualUnfold :: [TypeQ] -> ExpQ +autoMutualUnfold ts = do fail "oh" +
+ Data/Thorn/Internal.hs view
@@ -0,0 +1,131 @@+{-# LANGUAGE TemplateHaskell, ViewPatterns #-} + +module Data.Thorn.Internal ( + newVar, newVarP, newVarE + , newFunc, newFuncP, newFuncE + , newFmap, newFmapP, newFmapE + , mkNameE, mkNameCE, mkNameP + , Typex(..) + , Conx(..) + , cxtxs + , normalizeType + , apps + ) where + +import Language.Haskell.TH +import Data.List +import Data.Maybe +import Control.Monad +import Control.Applicative + +newVar,newFunc,newFmap :: Int -> Name +newVar n = mkName $ "thornvariant" ++ show n +newVarP = VarP . newVar +newVarE = VarE . newVar +newFunc n = mkName $ "thornfunction" ++ show n +newFuncP = VarP . newFunc +newFuncE = VarE . newFunc +newFmap n = mkName $ "thornfmap" ++ show n +newFmapP = VarP . newFmap +newFmapE = VarE . newFmap + +mkNameE = VarE . mkName +mkNameCE = ConE . mkName +mkNameP = VarP . mkName + +data Typex = + VarTx Name + | FuncTx (Typex -> TypexQ) + | DataTx Name VarMap [Conx] + | SeenDataTx Name VarMap + | BasicTx Name + | TupleTx [Typex] + | ArrowTx Typex Typex + | ListTx Typex + | SpecialTx Int +type TypexQ = Q Typex + +data Conx = + NormalCx Name [Typex] + | InfixCx Name Typex Typex + deriving Eq + +cxtxs :: Conx -> [Typex] +cxtxs (NormalCx _ txs) = txs +cxtxs (InfixCx _ txa txb) = [txa,txb] + +type VarMap = [(Name,Typex)] +type Datas = [(Name,VarMap)] + +instance Eq Typex where + VarTx t == VarTx t' = t==t' + DataTx nm vmp cons == DataTx nm' vmp' cons' = nm==nm'&&vmp==vmp'&&cons==cons' + SeenDataTx nm vmp == SeenDataTx nm' vmp' = nm==nm'&&vmp==vmp' + BasicTx nm == BasicTx nm' = nm==nm' + TupleTx txs == TupleTx txs' = txs==txs' + ArrowTx txa txb == ArrowTx txa' txb' = txa==txa'&&txb==txb' + ListTx tx == ListTx tx' = tx==tx' + SpecialTx n == SpecialTx n' = n==n' + _ == _ = False + +instance Show Typex where + show (DataTx _ _ _) = "DataTx" + show (SeenDataTx _ _) = "SeenDataTx" + show _ = "Foo" + +normalizeType :: VarMap -> Datas -> Type -> TypexQ +normalizeType vmp dts (ForallT tvs _ t) = normalizeType vmp' dts t + where vmp' = filter (\(nm,_) -> notElem nm (map nameTV tvs)) vmp +normalizeType vmp dts (AppT t u) = do + FuncTx f <- normalizeType vmp dts t + ux <- normalizeType vmp dts u + f ux +normalizeType vmp dts (SigT t _) = normalizeType vmp dts t +normalizeType vmp dts (VarT nm) = case (find (\(nm',_) -> nm==nm') vmp) of + Nothing -> return $ VarTx nm + Just (_,tx) -> return tx +normalizeType vmp dts (ConT nm) + | s == "()" = normalizeType vmp dts (TupleT 0) + | head s == '(' && dropWhile (==',') (tail s) == ")" = normalizeType vmp dts (TupleT (length s - 1)) + | s == "(->)" = normalizeType vmp dts ArrowT + | s == "[]" = normalizeType vmp dts ListT + | elem s ["Int","Word","Float","Double","Char","Ptr","FunPtr"] = return $ BasicTx nm + | otherwise = reify nm >>= go + where s = nameBase nm + go (TyConI (TySynD _ tvs u)) = ho (length tvs) [] + where ho 0 txs = normalizeType (zip (map nameTV tvs) (reverse txs)) dts u + ho n txs = return $ FuncTx $ \tx -> ho (n-1) (tx:txs) + go (TyConI (DataD _ _ tvs cons _)) = ho (length tvs) [] + where ho 0 txs = fromData nm (zip (map nameTV tvs) (reverse txs)) dts cons + ho n txs = return $ FuncTx $ \tx -> ho (n-1) (tx:txs) + go (TyConI (NewtypeD _ _ tvs con _)) = ho (length tvs) [] + where ho 0 txs = fromData nm (zip (map nameTV tvs) (reverse txs)) dts [con] + ho n txs = return $ FuncTx $ \tx -> ho (n-1) (tx:txs) + go (PrimTyConI _ _ _) = fail "Autofmap doesn't support such primitive types, sorry." + go (FamilyI _ _) = fail "Autofmap doesn't support type families, sorry." +normalizeType vmp dts (TupleT n) = go n [] + where go 0 txs = return $ TupleTx (reverse txs) + go n txs = return $ FuncTx $ \tx -> go (n-1) (tx:txs) +normalizeType vmp dts ArrowT = return $ FuncTx $ \txa -> return $ FuncTx $ \txb -> return $ ArrowTx txa txb +normalizeType vmp dts ListT = return $ FuncTx $ \tx -> return $ ListTx tx +normalizeType _ _ _ = fail "Autofmap doesn't support such types, sorry." + +fromData :: Name -> VarMap -> Datas -> [Con] -> TypexQ +fromData nm vmp dts cons = case find (\(nm',vmp')->nm==nm') dts of + Just (_,vmp') + | vmp == vmp' -> return $ SeenDataTx nm vmp + | otherwise -> fail "Autofmap doesn't support irregular types, sorry." + Nothing -> DataTx nm vmp <$> mapM normalizeCon cons + where dts' = (nm,vmp) : dts + normalizeCon (NormalC nm sts) = NormalCx nm <$> mapM normalizeStrictType sts + normalizeCon (RecC nm vsts) = NormalCx nm <$> mapM normalizeVarStrictType vsts + normalizeCon (InfixC sta nm stb) = InfixCx nm <$> normalizeStrictType sta <*> normalizeStrictType stb + normalizeStrictType (_,t) = normalizeType vmp dts' t + normalizeVarStrictType (_,_,t) = normalizeType vmp dts' t + +nameTV :: TyVarBndr -> Name +nameTV (PlainTV nm) = nm +nameTV (KindedTV nm _) = nm + +apps e es = foldl (\e es -> AppE e es) e es +
+ Data/Thorn/Zipper.hs view
@@ -0,0 +1,15 @@+{-# LANGUAGE TemplateHaskell, ViewPatterns #-} + +-- | +-- The module Data.Thorn.Zipper +module Data.Thorn.Zipper ( + autozipper + ) where + +import Data.Thorn.Internal +import Data.Thorn.Fmap +import Language.Haskell.TH + +autozipper :: TypeQ -> DecsQ +autozipper t = fail "oh" +
LICENSE view
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thorn.cabal view
@@ -2,8 +2,8 @@ synopsis: Template Haskell Library description: Template Haskell Library category: Data, Generics-version: 0.1-stability: provisional+version: 0.1.0.1+stability: experimental license: BSD3 license-file: LICENSE copyright: Copyright (C) 2013 Yusuke Matsushita@@ -12,7 +12,7 @@ homepage: https://github.com/Kinokkory/Thorn bug-reports: https://github.com/Kinokkory/Thorn/issues build-type: Simple-cabal-version: >= 1.6+cabal-version: >= 1.16 source-repository head type: git@@ -20,6 +20,7 @@ library exposed-modules: Data.Thorn+ other-modules: Data.Thorn.Fmap, Data.Thorn.Fold, Data.Thorn.Zipper, Data.Thorn.Internal build-depends: base >= 4 && < 5, template-haskell < 3,@@ -28,3 +29,5 @@ contravariant < 1, bifunctors < 5, profunctors < 5+ ghc-options: --Wall+ default-language: Haskell2010