144 lines
5.1 KiB
Haskell
144 lines
5.1 KiB
Haskell
{-# LANGUAGE TupleSections, FlexibleInstances, Rank2Types #-}
|
|
{-# OPTIONS_GHC -fno-warn-orphans #-}
|
|
|
|
module Language.Haskell.GhcMod.Info (
|
|
infoExpr
|
|
, info
|
|
, typeExpr
|
|
, typeOf
|
|
) where
|
|
|
|
import Control.Applicative ((<$>))
|
|
import Control.Monad (void)
|
|
import CoreMonad (liftIO)
|
|
import CoreUtils (exprType)
|
|
import Data.Function (on)
|
|
import Data.Generics hiding (typeOf)
|
|
import Data.List (sortBy)
|
|
import Data.Maybe (catMaybes, fromMaybe)
|
|
import Data.Ord as O
|
|
import Exception (ghandle, SomeException(..))
|
|
import GHC (Ghc, LHsBind, LHsExpr, LPat, Id, TypecheckedModule(..), DynFlags, SrcSpan, Type, Located, TypecheckedSource, GenLocated(L), LoadHowMuch(..))
|
|
import qualified GHC as G
|
|
import GHC.SYB.Utils (Stage(TypeChecker), everythingStaged)
|
|
import Language.Haskell.GhcMod.Doc (showPage, showOneLine, getStyle)
|
|
import Language.Haskell.GhcMod.GHCApi
|
|
import Language.Haskell.GhcMod.Gap (HasType(..))
|
|
import qualified Language.Haskell.GhcMod.Gap as Gap
|
|
import Language.Haskell.GhcMod.Types
|
|
import Outputable (PprStyle)
|
|
import TcHsSyn (hsPatType)
|
|
|
|
----------------------------------------------------------------
|
|
|
|
-- | Obtaining information of a target expression. (GHCi's info:)
|
|
infoExpr :: Options
|
|
-> Cradle
|
|
-> FilePath -- ^ A target file.
|
|
-> Expression -- ^ A Haskell expression.
|
|
-> IO String
|
|
infoExpr opt cradle file expr = (++ "\n") <$> withGHCDummyFile (info opt cradle file expr)
|
|
|
|
-- | Obtaining information of a target expression. (GHCi's info:)
|
|
info :: Options
|
|
-> Cradle
|
|
-> FilePath -- ^ A target file.
|
|
-> Expression -- ^ A Haskell expression.
|
|
-> Ghc String
|
|
info opt cradle file expr =
|
|
inModuleContext opt cradle file exprToInfo "Cannot show info"
|
|
where
|
|
exprToInfo = do
|
|
dflag <- G.getSessionDynFlags
|
|
sdoc <- Gap.infoThing expr
|
|
style <- getStyle
|
|
return $ showPage dflag style sdoc
|
|
|
|
----------------------------------------------------------------
|
|
|
|
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)
|
|
|
|
----------------------------------------------------------------
|
|
|
|
-- | Obtaining type of a target expression. (GHCi's type:)
|
|
typeExpr :: Options
|
|
-> Cradle
|
|
-> FilePath -- ^ A target file.
|
|
-> Int -- ^ Line number.
|
|
-> Int -- ^ Column number.
|
|
-> IO String
|
|
typeExpr opt cradle file lineNo colNo = withGHCDummyFile $ typeOf opt cradle file lineNo colNo
|
|
|
|
-- | Obtaining type of a target expression. (GHCi's type:)
|
|
typeOf :: Options
|
|
-> Cradle
|
|
-> FilePath -- ^ A target file.
|
|
-> Int -- ^ Line number.
|
|
-> Int -- ^ Column number.
|
|
-> Ghc String
|
|
typeOf opt cradle file lineNo colNo =
|
|
inModuleContext opt cradle file exprToType errmsg
|
|
where
|
|
exprToType = do
|
|
modGraph <- G.getModuleGraph
|
|
let ms = filter (\m -> G.ml_hs_file (G.ms_location m) == Just file) modGraph
|
|
modSum = head ms
|
|
p <- G.parseModule modSum
|
|
tcm@TypecheckedModule{tm_typechecked_source = tcs} <- G.typecheckModule p
|
|
let bs = listifySpans tcs (lineNo, colNo) :: [LHsBind Id]
|
|
es = listifySpans tcs (lineNo, colNo) :: [LHsExpr Id]
|
|
ps = listifySpans tcs (lineNo, colNo) :: [LPat Id]
|
|
bts <- mapM (getType tcm) bs
|
|
ets <- mapM (getType tcm) es
|
|
pts <- mapM (getType tcm) ps
|
|
dflag <- G.getSessionDynFlags
|
|
style <- getStyle
|
|
let sss = map (toTup dflag style) $ sortBy (cmp `on` fst) $ catMaybes $ concat [ets, bts, pts]
|
|
return $ convert opt sss
|
|
|
|
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
|
|
|
|
cmp a b
|
|
| a `G.isSubspanOf` b = O.LT
|
|
| b `G.isSubspanOf` a = O.GT
|
|
| otherwise = O.EQ
|
|
|
|
errmsg = convert opt ([] :: [((Int,Int,Int,Int),String)])
|
|
|
|
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
|
|
|
|
listifyStaged :: Typeable r => Stage -> (r -> Bool) -> GenericQ [r]
|
|
listifyStaged s p = everythingStaged s (++) [] ([] `mkQ` (\x -> [x | p x]))
|
|
|
|
pretty :: DynFlags -> PprStyle -> Type -> String
|
|
pretty dflag style = showOneLine dflag style . Gap.typeForUser
|
|
|
|
----------------------------------------------------------------
|
|
|
|
noWaringOptions :: [String]
|
|
noWaringOptions = ["-w:"]
|
|
|
|
inModuleContext :: Options -> Cradle -> FilePath -> Ghc String -> String -> Ghc String
|
|
inModuleContext opt cradle file action errmsg = ghandle handler $ do
|
|
void $ initializeFlagsWithCradle opt cradle noWaringOptions False
|
|
setTargetFiles [file]
|
|
void $ G.load LoadAllTargets
|
|
void $ G.depanal [] False >>= Gap.setCtx
|
|
action
|
|
where
|
|
handler (SomeException _) = return errmsg
|