ghc-mod/Language/Haskell/GhcMod/Gap.hs
2015-08-15 21:07:36 +03:00

554 lines
17 KiB
Haskell

{-# LANGUAGE TypeSynonymInstances, FlexibleInstances, CPP, ScopedTypeVariables, RankNTypes #-}
module Language.Haskell.GhcMod.Gap (
Language.Haskell.GhcMod.Gap.ClsInst
, mkTarget
, withStyle
, setLogAction
, getSrcSpan
, getSrcFile
, withContext
, fOptions
, toStringBuffer
, showSeverityCaption
, setCabalPkg
, setHideAllPackages
, setDeferTypeErrors
, setWarnTypedHoles
, setDumpSplices
, isDumpSplices
, filterOutChildren
, infoThing
, pprInfo
, HasType(..)
, errorMsgSpan
, typeForUser
, nameForUser
, occNameForUser
, deSugar
, showDocWith
, GapThing(..)
, fromTyThing
, fileModSummary
, WarnFlags
, emptyWarnFlags
, GLMatch
, GLMatchI
, getClass
, occName
, listVisibleModuleNames
, listVisibleModules
, lookupModulePackageInAllPackages
, Language.Haskell.GhcMod.Gap.isSynTyCon
, parseModuleHeader
) where
import Control.Applicative hiding (empty)
import Control.Monad (filterM)
import CoreSyn (CoreExpr)
import Data.List (intersperse)
import Data.Maybe (catMaybes)
import Data.Time.Clock (UTCTime)
import Data.Traversable hiding (mapM)
import DataCon (dataConRepType)
import Desugar (deSugarExpr)
import DynFlags
import ErrUtils
import Exception
import FastString
import GhcMonad
import HscTypes
import NameSet
import OccName
import Outputable
import PprTyThing
import StringBuffer
import TcType
import Var (varType)
import System.Directory
import qualified Name
import qualified InstEnv
import qualified Pretty
import qualified StringBuffer as SB
#if __GLASGOW_HASKELL__ >= 708
import FamInstEnv
import ConLike (ConLike(..))
import PatSyn (patSynType)
#else
import TcRnTypes
#endif
#if __GLASGOW_HASKELL__ >= 706
import GHC hiding (ClsInst)
#else
import GHC hiding (Instance)
import Control.Arrow hiding ((<+>))
import Data.Convertible
import RdrName (rdrNameOcc)
#endif
#if __GLASGOW_HASKELL__ < 710
import UniqFM (eltsUFM)
import Module
#endif
#if __GLASGOW_HASKELL__ >= 704
import qualified Data.IntSet as I (IntSet, empty)
#endif
import Bag
import Lexer as L
import Parser
import SrcLoc
import Packages
import Language.Haskell.GhcMod.Types (Expression(..))
import Prelude
----------------------------------------------------------------
----------------------------------------------------------------
--
#if __GLASGOW_HASKELL__ >= 706
type ClsInst = InstEnv.ClsInst
#else
type ClsInst = InstEnv.Instance
#endif
mkTarget :: TargetId -> Bool -> Maybe (SB.StringBuffer, UTCTime) -> Target
#if __GLASGOW_HASKELL__ >= 706
mkTarget = Target
#else
mkTarget tid allowObjCode = Target tid allowObjCode . (fmap . second) convert
#endif
----------------------------------------------------------------
----------------------------------------------------------------
withStyle :: DynFlags -> PprStyle -> SDoc -> Pretty.Doc
#if __GLASGOW_HASKELL__ >= 706
withStyle = withPprStyleDoc
#else
withStyle _ = withPprStyleDoc
#endif
setLogAction :: DynFlags
-> (DynFlags -> Severity -> SrcSpan -> PprStyle -> SDoc -> IO ())
-> DynFlags
setLogAction df f =
#if __GLASGOW_HASKELL__ >= 706
df { log_action = f }
#else
df { log_action = f df }
#endif
showDocWith :: DynFlags -> Pretty.Mode -> Pretty.Doc -> String
#if __GLASGOW_HASKELL__ >= 708
-- Pretty.showDocWith disappeard.
-- https://github.com/ghc/ghc/commit/08a3536e4246e323fbcd8040e0b80001950fe9bc
showDocWith dflags mode = Pretty.showDoc mode (pprCols dflags)
#else
showDocWith _ = Pretty.showDocWith
#endif
----------------------------------------------------------------
----------------------------------------------------------------
getSrcSpan :: SrcSpan -> Maybe (Int,Int,Int,Int)
#if __GLASGOW_HASKELL__ >= 702
getSrcSpan (RealSrcSpan spn)
#else
getSrcSpan spn | isGoodSrcSpan spn
#endif
= Just (srcSpanStartLine spn
, srcSpanStartCol spn
, srcSpanEndLine spn
, srcSpanEndCol spn)
getSrcSpan _ = Nothing
getSrcFile :: SrcSpan -> Maybe String
#if __GLASGOW_HASKELL__ >= 702
getSrcFile (RealSrcSpan spn) = Just . unpackFS . srcSpanFile $ spn
#else
getSrcFile spn | isGoodSrcSpan spn = Just . unpackFS . srcSpanFile $ spn
#endif
getSrcFile _ = Nothing
----------------------------------------------------------------
toStringBuffer :: GhcMonad m => [String] -> m StringBuffer
#if __GLASGOW_HASKELL__ >= 702
toStringBuffer = return . stringToStringBuffer . unlines
#else
toStringBuffer = liftIO . stringToStringBuffer . unlines
#endif
----------------------------------------------------------------
fOptions :: [String]
#if __GLASGOW_HASKELL__ >= 710
fOptions = [option | (FlagSpec option _ _ _) <- fFlags]
++ [option | (FlagSpec option _ _ _) <- fWarningFlags]
++ [option | (FlagSpec option _ _ _) <- fLangFlags]
#elif __GLASGOW_HASKELL__ >= 704
fOptions = [option | (option,_,_) <- fFlags]
++ [option | (option,_,_) <- fWarningFlags]
++ [option | (option,_,_) <- fLangFlags]
#else
fOptions = [option | (option,_,_,_) <- fFlags]
++ [option | (option,_,_,_) <- fWarningFlags]
++ [option | (option,_,_,_) <- fLangFlags]
#endif
----------------------------------------------------------------
----------------------------------------------------------------
fileModSummary :: GhcMonad m => FilePath -> m ModSummary
fileModSummary file' = do
mss <- getModuleGraph
file <- liftIO $ canonicalizePath file'
[ms] <- liftIO $ flip filterM mss $ \m ->
(Just file==) <$> canonicalizePath `traverse` ml_hs_file (ms_location m)
return ms
withContext :: GhcMonad m => m a -> m a
withContext action = gbracket setup teardown body
where
setup = getContext
teardown = setCtx
body _ = do
topImports >>= setCtx
action
topImports = do
mss <- getModuleGraph
mns <- map modName <$> filterM isTop mss
let ii = map IIModule mns
#if __GLASGOW_HASKELL__ >= 704
return ii
#else
return (ii,[])
#endif
isTop mos = lookupMod mos ||> returnFalse
lookupMod mos = lookupModule (ms_mod_name mos) Nothing >> return True
returnFalse = return False
#if __GLASGOW_HASKELL__ >= 706
modName = moduleName . ms_mod
setCtx = setContext
#elif __GLASGOW_HASKELL__ >= 704
modName = ms_mod
setCtx = setContext
#else
modName = ms_mod
setCtx = uncurry setContext
#endif
-- | Try the left action, if an IOException occurs try the right action.
(||>) :: ExceptionMonad m => m a -> m a -> m a
x ||> y = x `gcatch` (\(_ :: IOException) -> y)
showSeverityCaption :: Severity -> String
#if __GLASGOW_HASKELL__ >= 706
showSeverityCaption SevWarning = "Warning: "
showSeverityCaption _ = ""
#else
showSeverityCaption = const ""
#endif
----------------------------------------------------------------
----------------------------------------------------------------
setCabalPkg :: DynFlags -> DynFlags
#if __GLASGOW_HASKELL__ >= 708
setCabalPkg dflag = gopt_set dflag Opt_BuildingCabalPackage
#else
setCabalPkg dflag = dopt_set dflag Opt_BuildingCabalPackage
#endif
----------------------------------------------------------------
setHideAllPackages :: DynFlags -> DynFlags
#if __GLASGOW_HASKELL__ >= 708
setHideAllPackages df = gopt_set df Opt_HideAllPackages
#else
setHideAllPackages df = dopt_set df Opt_HideAllPackages
#endif
----------------------------------------------------------------
setDumpSplices :: DynFlags -> DynFlags
setDumpSplices dflag = dopt_set dflag Opt_D_dump_splices
isDumpSplices :: DynFlags -> Bool
isDumpSplices dflag = dopt Opt_D_dump_splices dflag
----------------------------------------------------------------
setDeferTypeErrors :: DynFlags -> DynFlags
#if __GLASGOW_HASKELL__ >= 708
setDeferTypeErrors dflag = gopt_set dflag Opt_DeferTypeErrors
#elif __GLASGOW_HASKELL__ >= 706
setDeferTypeErrors dflag = dopt_set dflag Opt_DeferTypeErrors
#else
setDeferTypeErrors = id
#endif
setWarnTypedHoles :: DynFlags -> DynFlags
#if __GLASGOW_HASKELL__ >= 708
setWarnTypedHoles dflag = wopt_set dflag Opt_WarnTypedHoles
#else
setWarnTypedHoles = id
#endif
----------------------------------------------------------------
----------------------------------------------------------------
class HasType a where
getType :: GhcMonad m => TypecheckedModule -> a -> m (Maybe (SrcSpan, Type))
instance HasType (LHsBind Id) where
#if __GLASGOW_HASKELL__ >= 708
getType _ (L spn FunBind{fun_matches = m}) = return $ Just (spn, typ)
where in_tys = mg_arg_tys m
out_typ = mg_res_ty m
typ = mkFunTys in_tys out_typ
#else
getType _ (L spn FunBind{fun_matches = MatchGroup _ typ}) = return $ Just (spn, typ)
#endif
getType _ _ = return Nothing
----------------------------------------------------------------
----------------------------------------------------------------
-- from ghc/InteractiveUI.hs
filterOutChildren :: (a -> TyThing) -> [a] -> [a]
filterOutChildren get_thing xs
= [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
where
implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
infoThing :: GhcMonad m => (FilePath -> FilePath) -> Expression -> m SDoc
infoThing m (Expression str) = do
names <- parseName str
#if __GLASGOW_HASKELL__ >= 708
mb_stuffs <- mapM (getInfo False) names
let filtered = filterOutChildren (\(t,_f,_i,_fam) -> t) (catMaybes mb_stuffs)
#else
mb_stuffs <- mapM getInfo names
let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
#endif
return $ vcat (intersperse (text "") $ map (pprInfo m False) filtered)
#if __GLASGOW_HASKELL__ >= 708
pprInfo :: (FilePath -> FilePath) -> Bool -> (TyThing, GHC.Fixity, [ClsInst], [FamInst]) -> SDoc
pprInfo m _ (thing, fixity, insts, famInsts)
= pprTyThingInContextLoc' thing
$$ show_fixity fixity
$$ InstEnv.pprInstances insts
$$ pprFamInsts famInsts
#else
pprInfo :: (FilePath -> FilePath) -> PrintExplicitForalls -> (TyThing, GHC.Fixity, [ClsInst]) -> SDoc
pprInfo m pefas (thing, fixity, insts)
= pprTyThingInContextLoc' pefas thing
$$ show_fixity fixity
$$ vcat (map pprInstance insts)
#endif
where
show_fixity fx
| fx == defaultFixity = Outputable.empty
| otherwise = ppr fx <+> ppr (getName thing)
#if __GLASGOW_HASKELL__ >= 708
pprTyThingInContextLoc' thing' = hang (pprTyThingInContext thing') 2
(char '\t' <> ptext (sLit "--") <+> loc)
where loc = ptext (sLit "Defined") <+> pprNameDefnLoc' (getName thing')
#else
pprTyThingInContextLoc' pefas thing' = hang (pprTyThingInContext pefas thing') 2
(char '\t' <> ptext (sLit "--") <+> loc)
where loc = ptext (sLit "Defined") <+> pprNameDefnLoc' (getName thing')
#endif
pprNameDefnLoc' name
= case Name.nameSrcLoc name of
RealSrcLoc s -> ptext (sLit "at") <+> ppr (subst s)
UnhelpfulLoc s
| Name.isInternalName name || Name.isSystemName name
-> ptext (sLit "at") <+> ftext s
| otherwise
-> ptext (sLit "in") <+> quotes (ppr (nameModule name))
where subst s = mkRealSrcLoc (realFP s) (srcLocLine s) (srcLocCol s)
realFP = mkFastString . m . unpackFS . srcLocFile
----------------------------------------------------------------
----------------------------------------------------------------
errorMsgSpan :: ErrMsg -> SrcSpan
#if __GLASGOW_HASKELL__ >= 708
errorMsgSpan = errMsgSpan
#else
errorMsgSpan = head . errMsgSpans
#endif
typeForUser :: Type -> SDoc
#if __GLASGOW_HASKELL__ >= 708
typeForUser = pprTypeForUser
#else
typeForUser = pprTypeForUser False
#endif
nameForUser :: Name -> SDoc
nameForUser = pprOccName . getOccName
occNameForUser :: OccName -> SDoc
occNameForUser = pprOccName
deSugar :: TypecheckedModule -> LHsExpr Id -> HscEnv
-> IO (Maybe CoreExpr)
#if __GLASGOW_HASKELL__ >= 708
deSugar _ e hs_env = snd <$> deSugarExpr hs_env e
#else
deSugar tcm e hs_env = snd <$> deSugarExpr hs_env modu rn_env ty_env e
where
modu = ms_mod $ pm_mod_summary $ tm_parsed_module tcm
tcgEnv = fst $ tm_internals_ tcm
rn_env = tcg_rdr_env tcgEnv
ty_env = tcg_type_env tcgEnv
#endif
----------------------------------------------------------------
----------------------------------------------------------------
data GapThing = GtA Type | GtT TyCon | GtN
fromTyThing :: TyThing -> GapThing
fromTyThing (AnId i) = GtA $ varType i
#if __GLASGOW_HASKELL__ >= 708
fromTyThing (AConLike (RealDataCon d)) = GtA $ dataConRepType d
fromTyThing (AConLike (PatSynCon p)) = GtA $ patSynType p
#else
fromTyThing (ADataCon d) = GtA $ dataConRepType d
#endif
fromTyThing (ATyCon t) = GtT t
fromTyThing _ = GtN
----------------------------------------------------------------
----------------------------------------------------------------
#if __GLASGOW_HASKELL__ >= 704
type WarnFlags = I.IntSet
emptyWarnFlags :: WarnFlags
emptyWarnFlags = I.empty
#else
type WarnFlags = [WarningFlag]
emptyWarnFlags :: WarnFlags
emptyWarnFlags = []
#endif
----------------------------------------------------------------
----------------------------------------------------------------
#if __GLASGOW_HASKELL__ >= 708
type GLMatch = LMatch RdrName (LHsExpr RdrName)
type GLMatchI = LMatch Id (LHsExpr Id)
#else
type GLMatch = LMatch RdrName
type GLMatchI = LMatch Id
#endif
getClass :: [LInstDecl Name] -> Maybe (Name, SrcSpan)
#if __GLASGOW_HASKELL__ >= 710
-- Instance declarations of sort 'instance F (G a)'
getClass [L loc (ClsInstD (ClsInstDecl {cid_poly_ty = (L _ (HsForAllTy _ _ _ _ (L _ (HsAppTy (L _ (HsTyVar className)) _))))}))] = Just (className, loc)
-- Instance declarations of sort 'instance F G' (no variables)
getClass [L loc (ClsInstD (ClsInstDecl {cid_poly_ty = (L _ (HsAppTy (L _ (HsTyVar className)) _))}))] = Just (className, loc)
#elif __GLASGOW_HASKELL__ >= 708
-- Instance declarations of sort 'instance F (G a)'
getClass [L loc (ClsInstD (ClsInstDecl {cid_poly_ty = (L _ (HsForAllTy _ _ _ (L _ (HsAppTy (L _ (HsTyVar className)) _))))}))] = Just (className, loc)
-- Instance declarations of sort 'instance F G' (no variables)
getClass [L loc (ClsInstD (ClsInstDecl {cid_poly_ty = (L _ (HsAppTy (L _ (HsTyVar className)) _))}))] = Just (className, loc)
#elif __GLASGOW_HASKELL__ >= 706
getClass [L loc (ClsInstD (L _ (HsForAllTy _ _ _ (L _ (HsAppTy (L _ (HsTyVar className)) _)))) _ _ _)] = Just (className, loc)
getClass[L loc (ClsInstD (L _ (HsAppTy (L _ (HsTyVar className)) _)) _ _ _)] = Just (className, loc)
#else
getClass [L loc (InstDecl (L _ (HsForAllTy _ _ _ (L _ (HsAppTy (L _ (HsTyVar className)) _)))) _ _ _)] = Just (className, loc)
getClass [L loc (InstDecl (L _ (HsAppTy (L _ (HsTyVar className)) _)) _ _ _)] = Just (className, loc)
#endif
getClass _ = Nothing
#if __GLASGOW_HASKELL__ < 706
occName :: RdrName -> OccName
occName = rdrNameOcc
#endif
----------------------------------------------------------------
#if __GLASGOW_HASKELL__ < 710
-- Copied from ghc/InteractiveUI.hs
allExposedPackageConfigs :: DynFlags -> [PackageConfig]
allExposedPackageConfigs df = filter exposed $ eltsUFM $ pkgIdMap $ pkgState df
allExposedModules :: DynFlags -> [ModuleName]
allExposedModules df = concat $ map exposedModules $ allExposedPackageConfigs df
listVisibleModuleNames :: DynFlags -> [ModuleName]
listVisibleModuleNames = allExposedModules
#endif
lookupModulePackageInAllPackages ::
DynFlags -> ModuleName -> [String]
lookupModulePackageInAllPackages df mn =
#if __GLASGOW_HASKELL__ >= 710
unpackSPId . sourcePackageId . snd <$> lookupModuleInAllPackages df mn
where
unpackSPId (SourcePackageId fs) = unpackFS fs
#else
unpackPId . sourcePackageId . fst <$> lookupModuleInAllPackages df mn
where
unpackPId pid = packageIdString $ mkPackageId pid
-- n ++ "-" ++ showVersion v
#endif
listVisibleModules :: DynFlags -> [GHC.Module]
listVisibleModules df = let
#if __GLASGOW_HASKELL__ >= 710
modNames = listVisibleModuleNames df
mods = [ m | mn <- modNames, (m, _) <- lookupModuleInAllPackages df mn ]
#else
pkgCfgs = allExposedPackageConfigs df
mods = [ mkModule pid modname | p <- pkgCfgs
, let pid = packageConfigId p
, modname <- exposedModules p ]
#endif
in mods
isSynTyCon :: TyCon -> Bool
#if __GLASGOW_HASKELL__ >= 710
isSynTyCon = GHC.isTypeSynonymTyCon
#else
isSynTyCon = GHC.isSynTyCon
#endif
parseModuleHeader
:: String -- ^ Haskell module source text (full Unicode is supported)
-> DynFlags
-> FilePath -- ^ the filename (for source locations)
-> Either ErrorMessages (WarningMessages, Located (HsModule RdrName))
parseModuleHeader str dflags filename =
let
loc = mkRealSrcLoc (mkFastString filename) 1 1
buf = stringToStringBuffer str
in
case L.unP Parser.parseHeader (mkPState dflags buf loc) of
PFailed sp err ->
#if __GLASGOW_HASKELL__ >= 706
Left (unitBag (mkPlainErrMsg dflags sp err))
#else
Left (unitBag (mkPlainErrMsg sp err))
#endif
POk pst rdr_module ->
let (warns,_) = getMessages pst in
Right (warns, rdr_module)