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|
{-# LANGUAGE MagicHash #-}
-----------------------------------------------------------------------------
-- |
-- Module : Haddock.Interface.AttachInstances
-- Copyright : (c) Simon Marlow 2006,
-- David Waern 2006-2009,
-- Isaac Dupree 2009
-- License : BSD-like
--
-- Maintainer : haddock@projects.haskell.org
-- Stability : experimental
-- Portability : portable
-----------------------------------------------------------------------------
module Haddock.Interface.AttachInstances (attachInstances) where
import Haddock.Types
import Haddock.Convert
import Control.Arrow
import Data.List
import qualified Data.Map as Map
import GHC
import Name
import InstEnv
import Class
import HscTypes (withSession, ioMsg)
import TcRnDriver (tcRnGetInfo)
#if __GLASGOW_HASKELL__ > 610 || (__GLASGOW_HASKELL__ == 610 && __GHC_PATCHLEVEL__ >= 2)
import TypeRep hiding (funTyConName)
#else
import TypeRep
#endif
import Var hiding (varName)
import TyCon
import PrelNames
import FastString
#define FSLIT(x) (mkFastString# (x#))
attachInstances :: [Interface] -> InstIfaceMap -> Ghc [Interface]
attachInstances ifaces instIfaceMap = mapM attach ifaces
where
attach iface = do
newItems <- mapM attachExport $ ifaceExportItems iface
return $ iface { ifaceExportItems = newItems }
where
attachExport export@ExportDecl{expItemDecl = L _ (TyClD d)} = do
mb_info <- getAllInfo (unLoc (tcdLName d))
return $ export { expItemInstances = case mb_info of
Just (_, _, instances) ->
let insts = map (first synifyInstHead) $ sortImage (first instHead)
[ (instanceHead i, getName i) | i <- instances ]
in [ (inst, lookupInstDoc name iface instIfaceMap)
| (inst, name) <- insts ]
Nothing -> []
}
attachExport export = return export
lookupInstDoc :: Name -> Interface -> InstIfaceMap -> Maybe (HsDoc Name)
-- TODO: capture this pattern in a function (when we have streamlined the
-- handling of instances)
lookupInstDoc name iface ifaceMap =
case Map.lookup name (ifaceInstanceDocMap iface) of
Just doc -> Just doc
Nothing -> do -- in Maybe
instIface <- Map.lookup modName ifaceMap
(Just doc, _) <- Map.lookup name (instDocMap instIface)
return doc
where
modName = nameModule name
-- | Like GHC's getInfo but doesn't cut things out depending on the
-- interative context, which we don't set sufficiently anyway.
getAllInfo :: GhcMonad m => Name -> m (Maybe (TyThing,Fixity,[Instance]))
getAllInfo name = withSession $ \hsc_env -> ioMsg $ tcRnGetInfo hsc_env name
--------------------------------------------------------------------------------
-- Collecting and sorting instances
--------------------------------------------------------------------------------
-- | Simplified type for sorting types, ignoring qualification (not visible
-- in Haddock output) and unifying special tycons with normal ones.
-- For the benefit of the user (looks nice and predictable) and the
-- tests (which prefer output to be deterministic).
data SimpleType = SimpleType Name [SimpleType] deriving (Eq,Ord)
-- TODO: should we support PredTy here?
instHead :: ([TyVar], [PredType], Class, [Type]) -> ([Int], Name, [SimpleType])
instHead (_, _, cls, args)
= (map argCount args, className cls, map simplify args)
where
argCount (AppTy t _) = argCount t + 1
argCount (TyConApp _ ts) = length ts
argCount (FunTy _ _ ) = 2
argCount (ForAllTy _ t) = argCount t
argCount _ = 0
simplify (ForAllTy _ t) = simplify t
simplify (FunTy t1 t2) =
SimpleType funTyConName [simplify t1, simplify t2]
simplify (AppTy t1 t2) = SimpleType s (ts ++ [simplify t2])
where (SimpleType s ts) = simplify t1
simplify (TyVarTy v) = SimpleType (tyVarName v) []
simplify (TyConApp tc ts) = SimpleType (tyConName tc) (map simplify ts)
simplify _ = error "simplify"
-- sortImage f = sortBy (\x y -> compare (f x) (f y))
sortImage :: Ord b => (a -> b) -> [a] -> [a]
sortImage f xs = map snd $ sortBy cmp_fst [(f x, x) | x <- xs]
where cmp_fst (x,_) (y,_) = compare x y
funTyConName :: Name
funTyConName = mkWiredInName gHC_PRIM
(mkOccNameFS tcName FSLIT("(->)"))
funTyConKey
(ATyCon funTyCon) -- Relevant TyCon
BuiltInSyntax
|
