ghc-mod/Language/Haskell/GhcMod/SrcUtils.hs
2014-06-28 23:18:49 +02:00

98 lines
3.7 KiB
Haskell

{-# LANGUAGE TupleSections, FlexibleInstances, Rank2Types #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Language.Haskell.GhcMod.SrcUtils where
import Control.Applicative ((<$>))
import CoreUtils (exprType)
import Data.Generics
import Data.Maybe (fromMaybe)
import Data.Ord as O
import GHC (LHsExpr, LPat, Id, DynFlags, SrcSpan, Type, Located, ParsedSource, RenamedSource, TypecheckedSource, GenLocated(L))
import GhcMonad
import qualified GHC as G
import GHC.SYB.Utils (Stage(..), everythingStaged)
import Language.Haskell.GhcMod.Doc (showOneLine, getStyle)
import Language.Haskell.GhcMod.GHCApi
import Language.Haskell.GhcMod.Gap (HasType(..), setWarnTypedHoles, setDeferTypeErrors)
import qualified Language.Haskell.GhcMod.Gap as Gap
import Outputable (PprStyle)
import TcHsSyn (hsPatType)
import OccName (OccName)
import qualified Language.Haskell.Exts.Annotated as HE
----------------------------------------------------------------
instance HasType (LHsExpr Id) where
getType tcm e = do
hs_env <- G.getSession
mbe <- liftIO $ Gap.deSugar tcm e hs_env
return $ (G.getLoc e, ) <$> CoreUtils.exprType <$> mbe
instance HasType (LPat Id) where
getType _ (G.L spn pat) = return $ Just (spn, hsPatType pat)
----------------------------------------------------------------
listifySpans :: Typeable a => TypecheckedSource -> (Int, Int) -> [Located a]
listifySpans tcs lc = listifyStaged TypeChecker p tcs
where
p (L spn _) = G.isGoodSrcSpan spn && spn `G.spans` lc
listifyParsedSpans :: Typeable a => ParsedSource -> (Int, Int) -> [Located a]
listifyParsedSpans pcs lc = listifyStaged Parser p pcs
where
p (L spn _) = G.isGoodSrcSpan spn && spn `G.spans` lc
listifyRenamedSpans :: Typeable a => RenamedSource -> (Int, Int) -> [Located a]
listifyRenamedSpans pcs lc = listifyStaged Renamer p pcs
where
p (L spn _) = G.isGoodSrcSpan spn && spn `G.spans` lc
listifyStaged :: Typeable r => Stage -> (r -> Bool) -> GenericQ [r]
listifyStaged s p = everythingStaged s (++) [] ([] `mkQ` (\x -> [x | p x]))
cmp :: SrcSpan -> SrcSpan -> Ordering
cmp a b
| a `G.isSubspanOf` b = O.LT
| b `G.isSubspanOf` a = O.GT
| otherwise = O.EQ
toTup :: DynFlags -> PprStyle -> (SrcSpan, Type) -> ((Int,Int,Int,Int),String)
toTup dflag style (spn, typ) = (fourInts spn, pretty dflag style typ)
fourInts :: SrcSpan -> (Int,Int,Int,Int)
fourInts = fromMaybe (0,0,0,0) . Gap.getSrcSpan
fourIntsHE :: HE.SrcSpan -> (Int,Int,Int,Int)
fourIntsHE loc = ( HE.srcSpanStartLine loc, HE.srcSpanStartColumn loc
, HE.srcSpanEndLine loc, HE.srcSpanEndColumn loc)
-- Check whether (line,col) is inside a given SrcSpanInfo
typeSigInRangeHE :: Int -> Int -> HE.Decl HE.SrcSpanInfo -> Bool
typeSigInRangeHE lineNo colNo (HE.TypeSig (HE.SrcSpanInfo s _) _ _) =
HE.srcSpanStart s <= (lineNo, colNo) && HE.srcSpanEnd s >= (lineNo, colNo)
typeSigInRangeHE _ _ _= False
pretty :: DynFlags -> PprStyle -> Type -> String
pretty dflag style = showOneLine dflag style . Gap.typeForUser
----------------------------------------------------------------
inModuleContext ::GhcMonad m => FilePath -> (DynFlags -> PprStyle -> m a) -> m a
inModuleContext file action =
withDynFlags (setWarnTypedHoles . setDeferTypeErrors . setNoWaringFlags) $ do
setTargetFiles [file]
Gap.withContext $ do
dflag <- G.getSessionDynFlags
style <- getStyle
action dflag style
----------------------------------------------------------------
showName :: DynFlags -> PprStyle -> G.Name -> String
showName dflag style name = showOneLine dflag style $ Gap.nameForUser name
showOccName :: DynFlags -> PprStyle -> OccName -> String
showOccName dflag style name = showOneLine dflag style $ Gap.occNameForUser name