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|
{-# LANGUAGE CPP, 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 qualified Data.Set as Set
import Class
import FamInstEnv
import FastString
import GHC
import GhcMonad (withSession)
import Id
import InstEnv
import MonadUtils (liftIO)
import Name
import PrelNames
import TcRnDriver (tcRnGetInfo)
import TcType (tcSplitSigmaTy)
import TyCon
import TypeRep
import TysPrim( funTyCon )
import Var hiding (varName)
#define FSLIT(x) (mkFastString# (x#))
type ExportedNames = Set.Set Name
type Modules = Set.Set Module
type ExportInfo = (ExportedNames, Modules)
attachInstances :: ExportInfo -> [Interface] -> InstIfaceMap -> Ghc [Interface]
attachInstances expInfo ifaces instIfaceMap = mapM attach ifaces
where
-- TODO: take an IfaceMap as input
ifaceMap = Map.fromList [ (ifaceMod i, i) | i <- ifaces ]
attach iface = do
newItems <- mapM (attachToExportItem expInfo iface ifaceMap instIfaceMap)
(ifaceExportItems iface)
return $ iface { ifaceExportItems = newItems }
attachToExportItem :: ExportInfo -> Interface -> IfaceMap -> InstIfaceMap -> ExportItem Name -> Ghc (ExportItem Name)
attachToExportItem expInfo iface ifaceMap instIfaceMap export =
case export of
ExportDecl { expItemDecl = L _ (TyClD d) } -> do
mb_info <- getAllInfo (tcdName d)
let export' =
export {
expItemInstances =
case mb_info of
Just (_, _, cls_instances, fam_instances) ->
let fam_insts = [ (synifyFamInst i, n)
| i <- sortImage instFam fam_instances
, let n = lookupInstDoc (getName i) iface ifaceMap instIfaceMap
]
cls_insts = [ (synifyInstHead i, lookupInstDoc n iface ifaceMap instIfaceMap)
| let is = [ (instanceHead' i, getName i) | i <- cls_instances ]
, (i@(_,_,cls,tys), n) <- sortImage (first instHead) is
, not $ isInstanceHidden expInfo cls tys
]
in cls_insts ++ fam_insts
Nothing -> []
}
return export'
_ -> return export
lookupInstDoc :: Name -> Interface -> IfaceMap -> InstIfaceMap -> Maybe (Doc Name)
-- TODO: capture this pattern in a function (when we have streamlined the
-- handling of instances)
lookupInstDoc name iface ifaceMap instIfaceMap =
case Map.lookup name (ifaceDocMap iface) of
Just doc -> Just doc
Nothing ->
case Map.lookup modName ifaceMap of
Just iface2 ->
case Map.lookup name (ifaceDocMap iface2) of
Just doc -> Just doc
Nothing -> Nothing
Nothing ->
case Map.lookup modName instIfaceMap of
Just instIface -> Map.lookup name (instDocMap instIface)
Nothing -> Nothing
where
modName = nameModule name
-- | Like GHC's 'instanceHead' but drops "silent" arguments.
instanceHead' :: ClsInst -> ([TyVar], ThetaType, Class, [Type])
instanceHead' ispec = (tvs, dropSilentArgs dfun theta, cls, tys)
where
dfun = is_dfun ispec
(tvs, cls, tys) = instanceHead ispec
(_, theta, _) = tcSplitSigmaTy (idType dfun)
-- | Drop "silent" arguments. See GHC Note [Silent superclass
-- arguments].
dropSilentArgs :: DFunId -> ThetaType -> ThetaType
dropSilentArgs dfun theta = drop (dfunNSilent dfun) theta
-- | 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,[ClsInst],[FamInst]))
getAllInfo name = withSession $ \hsc_env -> do
(_msgs, r) <- liftIO $ tcRnGetInfo hsc_env name
return r
--------------------------------------------------------------------------------
-- 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]
| SimpleTyLit TyLit
deriving (Eq,Ord)
instHead :: ([TyVar], [PredType], Class, [Type]) -> ([Int], Name, [SimpleType])
instHead (_, _, cls, args)
= (map argCount args, className cls, map simplify args)
argCount :: Type -> Int
argCount (AppTy t _) = argCount t + 1
argCount (TyConApp _ ts) = length ts
argCount (FunTy _ _ ) = 2
argCount (ForAllTy _ t) = argCount t
argCount _ = 0
simplify :: Type -> SimpleType
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 (LitTy l) = SimpleTyLit l
-- Used for sorting
instFam :: FamInst -> ([Int], Name, [SimpleType], Int, SimpleType)
instFam FamInst { fi_fam = n, fi_tys = ts, fi_rhs = t }
= (map argCount ts, n, map simplify ts, argCount t, simplify t)
-- 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
--------------------------------------------------------------------------------
-- Filtering hidden instances
--------------------------------------------------------------------------------
-- | A class or data type is hidden iff
--
-- * it is defined in one of the modules that are being processed
--
-- * and it is not exported by any non-hidden module
isNameHidden :: ExportInfo -> Name -> Bool
isNameHidden (names, modules) name =
nameModule name `Set.member` modules &&
not (name `Set.member` names)
-- | We say that an instance is «hidden» iff its class or any (part)
-- of its type(s) is hidden.
isInstanceHidden :: ExportInfo -> Class -> [Type] -> Bool
isInstanceHidden expInfo cls tys =
instClassHidden || instTypeHidden
where
instClassHidden :: Bool
instClassHidden = isNameHidden expInfo $ getName cls
instTypeHidden :: Bool
instTypeHidden = any typeHidden tys
nameHidden :: Name -> Bool
nameHidden = isNameHidden expInfo
typeHidden :: Type -> Bool
typeHidden t =
case t of
TyVarTy {} -> False
AppTy t1 t2 -> typeHidden t1 || typeHidden t2
TyConApp tcon args -> nameHidden (getName tcon) || any typeHidden args
FunTy t1 t2 -> typeHidden t1 || typeHidden t2
ForAllTy _ ty -> typeHidden ty
LitTy _ -> False
|
