150 lines
5.1 KiB
Haskell
150 lines
5.1 KiB
Haskell
{-# LANGUAGE CPP, Rank2Types, TupleSections #-}
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module Info (infoExpr, typeExpr) where
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import Cabal
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import Control.Applicative
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import CoreUtils
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import Data.Function
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import Data.Generics
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import Data.List
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import Data.Maybe
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import Data.Ord as O
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import Desugar
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import GHC
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import GHC.SYB.Utils
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import GHCApi
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import qualified Gap
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import HscTypes
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import NameSet
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import Outputable
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import PprTyThing
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import System.Time
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import TcRnTypes
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import Types
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----------------------------------------------------------------
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type Expression = String
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type ModuleString = String
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----------------------------------------------------------------
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infoExpr :: Options -> ModuleString -> Expression -> FilePath -> IO String
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infoExpr opt modstr expr file = (++ "\n") <$> info opt file modstr expr
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info :: Options -> FilePath -> ModuleString -> FilePath -> IO String
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info opt fileName modstr expr = inModuleContext opt fileName modstr exprToInfo
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where
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exprToInfo = infoThing expr
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----------------------------------------------------------------
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typeExpr :: Options -> ModuleString -> Int -> Int -> FilePath -> IO String
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typeExpr opt modstr lineNo colNo file = Info.typeOf opt file modstr lineNo colNo
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typeOf :: Options -> FilePath -> ModuleString -> Int -> Int -> IO String
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typeOf opt fileName modstr lineNo colNo = inModuleContext opt fileName modstr exprToType
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where
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exprToType = do
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modSum <- getModSummary $ mkModuleName modstr
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p <- parseModule modSum
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tcm <- typecheckModule p
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let es = findExpr tcm lineNo colNo
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ts <- catMaybes <$> mapM (getType tcm) es
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let sss = map toTup $ sortBy (cmp `on` fst) ts
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return $ convert opt sss
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toTup :: (SrcSpan, Type) -> ((Int,Int,Int,Int),String)
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toTup (spn, typ) = (fourInts spn, pretty typ)
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fourInts :: SrcSpan -> (Int,Int,Int,Int)
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fourInts = fromMaybe (0,0,0,0) . Gap.getSrcSpan
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cmp a b
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| a `isSubspanOf` b = O.LT
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| b `isSubspanOf` a = O.GT
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| otherwise = O.EQ
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findExpr :: TypecheckedModule -> Int -> Int -> [LHsExpr Id]
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findExpr tcm line col =
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let src = tm_typechecked_source tcm
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in listifyStaged TypeChecker f src
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where
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f :: LHsExpr Id -> Bool
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f (L spn _) = isGoodSrcSpan spn && spn `spans` (line, col)
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listifyStaged :: Typeable r => Stage -> (r -> Bool) -> GenericQ [r]
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listifyStaged s p = everythingStaged s (++) [] ([] `mkQ` (\x -> [x | p x]))
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getType :: GhcMonad m => TypecheckedModule -> LHsExpr Id -> m (Maybe (SrcSpan, Type))
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getType tcm e = do
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hs_env <- getSession
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(_, mbe) <- Gap.liftIO $ deSugarExpr hs_env modu rn_env ty_env e
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return $ (getLoc e, ) <$> CoreUtils.exprType <$> mbe
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where
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modu = ms_mod $ pm_mod_summary $ tm_parsed_module tcm
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rn_env = tcg_rdr_env $ fst $ tm_internals_ tcm
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ty_env = tcg_type_env $ fst $ tm_internals_ tcm
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pretty :: Type -> String
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pretty = showSDocForUser neverQualify . pprTypeForUser False
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----------------------------------------------------------------
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-- from ghc/InteractiveUI.hs
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infoThing :: String -> Ghc String
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infoThing str = do
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names <- parseName str
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mb_stuffs <- mapM getInfo names
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let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
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unqual <- getPrintUnqual
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return $ showSDocForUser unqual $ vcat (intersperse (text "") $ map (pprInfo False) filtered)
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filterOutChildren :: (a -> TyThing) -> [a] -> [a]
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filterOutChildren get_thing xs
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= [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
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where
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implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
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pprInfo :: PrintExplicitForalls -> (TyThing, GHC.Fixity, [Instance]) -> SDoc
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pprInfo pefas (thing, fixity, insts)
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= pprTyThingInContextLoc pefas thing
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$$ show_fixity fixity
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$$ vcat (map pprInstance insts)
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where
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show_fixity fx
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| fx == defaultFixity = Outputable.empty
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| otherwise = ppr fx <+> ppr (getName thing)
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----------------------------------------------------------------
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inModuleContext :: Options -> FilePath -> ModuleString -> Ghc String -> IO String
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inModuleContext opt fileName modstr action = withGHC valid
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where
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valid = do
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(file,_) <- initializeGHC opt fileName ["-w"] False
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setTargetFile file
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load LoadAllTargets
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mif setContextFromTarget action invalid
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invalid = do
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initializeGHC opt fileName ["-w"] False
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setTargetBuffer
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load LoadAllTargets
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mif setContextFromTarget action (return errorMessage)
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setTargetBuffer = do
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modgraph <- depanal [mkModuleName modstr] True
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let imports = concatMap (map (showSDoc . ppr . unLoc)) $
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map ms_imps modgraph ++ map ms_srcimps modgraph
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moddef = "module " ++ sanitize modstr ++ " where"
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header = moddef : imports
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importsBuf <- Gap.toStringBuffer header
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clkTime <- Gap.liftIO getClockTime
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setTargets [Target (TargetModule $ mkModuleName modstr) True (Just (importsBuf, clkTime))]
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mif m t e = m >>= \ok -> if ok then t else e
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sanitize = fromMaybe "SomeModule" . listToMaybe . words
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errorMessage = "Couldn't determine type"
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setContextFromTarget :: Ghc Bool
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setContextFromTarget = depanal [] False >>= Gap.setCtx
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