66 lines
2.4 KiB
Haskell
66 lines
2.4 KiB
Haskell
module Language.Haskell.GhcMod.Info (
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info
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, types
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) where
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import Control.Applicative ((<$>))
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import Data.Function (on)
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import Data.List (sortBy)
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import Data.Maybe (catMaybes)
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import Exception (ghandle, SomeException(..))
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import GHC (GhcMonad, LHsBind, LHsExpr, LPat, Id, TypecheckedModule(..), SrcSpan, Type)
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import qualified GHC as G
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import Language.Haskell.GhcMod.Doc (showPage)
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import Language.Haskell.GhcMod.Gap (HasType(..))
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import qualified Language.Haskell.GhcMod.Gap as Gap
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import Language.Haskell.GhcMod.Monad
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import Language.Haskell.GhcMod.SrcUtils
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Convert
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----------------------------------------------------------------
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-- | Obtaining information of a target expression. (GHCi's info:)
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info :: IOish m
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=> FilePath -- ^ A target file.
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-> Expression -- ^ A Haskell expression.
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-> GhcModT m String
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info file expr = do
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opt <- options
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convert opt <$> ghandle handler body
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where
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body = inModuleContext file $ \dflag style -> do
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sdoc <- Gap.infoThing expr
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return $ showPage dflag style sdoc
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handler (SomeException _) = return "Cannot show info"
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----------------------------------------------------------------
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-- | Obtaining type of a target expression. (GHCi's type:)
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types :: IOish m
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=> FilePath -- ^ A target file.
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-> Int -- ^ Line number.
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-> Int -- ^ Column number.
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-> GhcModT m String
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types file lineNo colNo = do
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opt <- options
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convert opt <$> ghandle handler body
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where
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body = inModuleContext file $ \dflag style -> do
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modSum <- Gap.fileModSummary file
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srcSpanTypes <- getSrcSpanType modSum lineNo colNo
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return $ map (toTup dflag style) $ sortBy (cmp `on` fst) srcSpanTypes
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handler (SomeException _) = return []
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getSrcSpanType :: GhcMonad m => G.ModSummary -> Int -> Int -> m [(SrcSpan, Type)]
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getSrcSpanType modSum lineNo colNo = do
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p <- G.parseModule modSum
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tcm@TypecheckedModule{tm_typechecked_source = tcs} <- G.typecheckModule p
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let bs = listifySpans tcs (lineNo, colNo) :: [LHsBind Id]
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es = listifySpans tcs (lineNo, colNo) :: [LHsExpr Id]
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ps = listifySpans tcs (lineNo, colNo) :: [LPat Id]
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bts <- mapM (getType tcm) bs
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ets <- mapM (getType tcm) es
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pts <- mapM (getType tcm) ps
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return $ catMaybes $ concat [ets, bts, pts]
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