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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE Rank2Types #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Haddock.Backends.Xhtml.Specialize
( specialize, specialize'
, specializeTyVarBndrs
, sugar, rename
, freeVariables
) where
import Haddock.Syb
import Haddock.Types
import GHC
import Name
import Control.Monad
import Control.Monad.Trans.RWS
import Data.Data
import qualified Data.List as List
import Data.Maybe
import Data.Map (Map)
import qualified Data.Map as Map
import Data.Set (Set)
import qualified Data.Set as Set
specialize :: (Eq name, Typeable name)
=> Data a
=> name -> HsType name -> a -> a
specialize name details = everywhere (mkT $ specializeStep name details)
specialize' :: (Eq name, Typeable name)
=> Data a
=> [(name, HsType name)] -> a -> a
specialize' = flip $ foldr (uncurry specialize)
specializeStep :: Eq name => name -> HsType name -> HsType name -> HsType name
specializeStep name details (HsTyVar name') | name == name' = details
specializeStep _ _ typ = typ
specializeTyVarBndrs :: (Eq name, Typeable name, DataId name)
=> LHsTyVarBndrs name -> [HsType name]
-> HsType name -> HsType name
specializeTyVarBndrs bndrs typs =
specialize' $ zip bndrs' typs
where
bndrs' = map (bname . unLoc) . hsq_tvs $ bndrs
bname (UserTyVar name) = name
bname (KindedTyVar (L _ name) _) = name
sugar :: forall name. (NamedThing name, DataId name)
=> HsType name -> HsType name
sugar =
everywhere $ mkT step
where
step :: HsType name -> HsType name
step = sugarTuples . sugarLists
sugarLists :: NamedThing name => HsType name -> HsType name
sugarLists (HsAppTy (L _ (HsTyVar name)) ltyp)
| isBuiltInSyntax name' && strName == "[]" = HsListTy ltyp
where
name' = getName name
strName = occNameString . nameOccName $ name'
sugarLists typ = typ
sugarTuples :: NamedThing name => HsType name -> HsType name
sugarTuples typ =
aux [] typ
where
aux apps (HsAppTy (L _ ftyp) atyp) = aux (atyp:apps) ftyp
aux apps (HsParTy (L _ typ')) = aux apps typ'
aux apps (HsTyVar name)
| isBuiltInSyntax name' && suitable = HsTupleTy HsBoxedTuple apps
where
name' = getName name
strName = occNameString . nameOccName $ name'
suitable = case parseTupleArity strName of
Just arity -> arity == length apps
Nothing -> False
aux _ _ = typ
parseTupleArity :: String -> Maybe Int
parseTupleArity ('(':commas) = do
n <- parseCommas commas
guard $ n /= 0
return $ n + 1
where
parseCommas (',':rest) = (+ 1) <$> parseCommas rest
parseCommas ")" = Just 0
parseCommas _ = Nothing
parseTupleArity _ = Nothing
setInternalOccName :: SetName name => OccName -> name -> name
setInternalOccName occ name =
setName nname' name
where
nname = getName name
nname' = mkInternalName (nameUnique nname) occ (nameSrcSpan nname)
rename :: SetName name => Set OccName -> HsType name -> HsType name
rename fv typ = fst $ evalRWS (renameType typ) fv Map.empty
type Rename name a = RWS (Set OccName) () (Map Name name) a
renameType :: SetName name => HsType name -> Rename name (HsType name)
renameType (HsForAllTy ex mspan lbndrs lctx lt) = do
lbndrs' <- renameLTyVarBndrs lbndrs
HsForAllTy
<$> pure ex
<*> pure mspan
<*> pure lbndrs'
<*> located renameContext lctx
<*> renameLType lt
renameType (HsTyVar name) = HsTyVar <$> renameName name
renameType (HsAppTy lf la) = HsAppTy <$> renameLType lf <*> renameLType la
renameType (HsFunTy la lr) = HsFunTy <$> renameLType la <*> renameLType lr
renameType (HsListTy lt) = HsListTy <$> renameLType lt
renameType (HsPArrTy lt) = HsPArrTy <$> renameLType lt
renameType (HsTupleTy srt lt) = HsTupleTy srt <$> mapM renameLType lt
renameType (HsOpTy la lop lb) =
HsOpTy <$> renameLType la <*> renameLTyOp lop <*> renameLType lb
renameType (HsParTy lt) = HsParTy <$> renameLType lt
renameType (HsIParamTy ip lt) = HsIParamTy ip <$> renameLType lt
renameType (HsEqTy la lb) = HsEqTy <$> renameLType la <*> renameLType lb
renameType (HsKindSig lt lk) = HsKindSig <$> renameLType lt <*> pure lk
renameType t@(HsQuasiQuoteTy _) = pure t
renameType t@(HsSpliceTy _ _) = pure t
renameType (HsDocTy lt doc) = HsDocTy <$> renameLType lt <*> pure doc
renameType (HsBangTy bang lt) = HsBangTy bang <$> renameLType lt
renameType t@(HsRecTy _) = pure t
renameType t@(HsCoreTy _) = pure t
renameType (HsExplicitListTy ph ltys) =
HsExplicitListTy ph <$> renameLTypes ltys
renameType (HsExplicitTupleTy phs ltys) =
HsExplicitTupleTy phs <$> renameLTypes ltys
renameType t@(HsTyLit _) = pure t
renameType (HsWrapTy wrap t) = HsWrapTy wrap <$> renameType t
renameType HsWildcardTy = pure HsWildcardTy
renameType (HsNamedWildcardTy name) = HsNamedWildcardTy <$> renameName name
freeVariables :: forall name. (NamedThing name, DataId name)
=> HsType name -> Set OccName
freeVariables =
everythingWithState Set.empty Set.union query
where
query term ctx = case cast term :: Maybe (HsType name) of
Just (HsForAllTy _ _ bndrs _ _) ->
(Set.empty, Set.union ctx (bndrsNames bndrs))
Just (HsTyVar name)
| getName name `Set.member` ctx -> (Set.empty, ctx)
| otherwise -> (Set.singleton $ getOccName name, ctx)
_ -> (Set.empty, ctx)
bndrsNames = Set.fromList . map (getName . tyVarName . unLoc) . hsq_tvs
renameLType :: SetName name => LHsType name -> Rename name (LHsType name)
renameLType = located renameType
renameLTypes :: SetName name => [LHsType name] -> Rename name [LHsType name]
renameLTypes = mapM renameLType
renameContext :: SetName name => HsContext name
-> Rename name (HsContext name)
renameContext = renameLTypes
renameLTyVarBndrs :: SetName name => LHsTyVarBndrs name -> Rename name (LHsTyVarBndrs name)
renameLTyVarBndrs lbndrs = do
tys' <- mapM (located renameTyVarBndr) $ hsq_tvs lbndrs
pure $ lbndrs { hsq_tvs = tys' }
renameTyVarBndr :: SetName name => HsTyVarBndr name
-> Rename name (HsTyVarBndr name)
renameTyVarBndr (UserTyVar name) =
UserTyVar <$> renameNameBndr name
renameTyVarBndr (KindedTyVar name kinds) =
KindedTyVar <$> located renameNameBndr name <*> pure kinds
renameLTyOp :: SetName name => LHsTyOp name -> Rename name (LHsTyOp name)
renameLTyOp (wrap, lname) = (,) wrap <$> located renameName lname
renameNameBndr :: SetName name => name -> Rename name name
renameNameBndr name = do
fv <- ask
env <- get
case Map.lookup (getName name) env of
Just name' -> pure name'
Nothing | getOccName name `Set.member` fv -> freshName name
Nothing -> pure name
renameName :: SetName name => name -> Rename name name
renameName name = do
env <- get
pure $ case Map.lookup (getName name) env of
Just name' -> name'
Nothing -> name
freshName :: SetName name => name -> Rename name name
freshName name = do
fv <- ask
env <- get
let taken = Set.union fv (Set.fromList . map getOccName . Map.keys $ env)
let name' = setInternalOccName (findFreshName taken occ) name
put $ Map.insert nname name' env
return name'
where
nname = getName name
occ = nameOccName nname
findFreshName :: Set OccName -> OccName -> OccName
findFreshName taken =
fromJust . List.find isFresh . alternativeNames
where
isFresh = not . flip Set.member taken
alternativeNames :: OccName -> [OccName]
alternativeNames name
| [_] <- occNameString name = letterNames ++ alternativeNames' name
where
letterNames = map (mkVarOcc . pure) ['a'..'z']
alternativeNames name = alternativeNames' name
alternativeNames' :: OccName -> [OccName]
alternativeNames' name =
[ mkVarOcc $ str ++ show i | i :: Int <- [0..] ]
where
str = occNameString name
located :: Functor f => (a -> f b) -> Located a -> f (Located b)
located f (L loc e) = L loc <$> f e
tyVarName :: HsTyVarBndr name -> name
tyVarName (UserTyVar name) = name
tyVarName (KindedTyVar (L _ name) _) = name
|
