204 lines
6.6 KiB
Haskell
204 lines
6.6 KiB
Haskell
{-# LANGUAGE CPP, Rank2Types, TupleSections #-}
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module Info where
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import Cabal
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import Control.Applicative hiding (empty)
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import Control.Exception
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import Control.Monad
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import CoreUtils
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import Data.Generics as G
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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 HscTypes
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import NameSet
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import Outputable
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import PprTyThing
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import StringBuffer
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import System.Time
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import TcRnTypes
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import Types
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#if __GLASGOW_HASKELL__ >= 702
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import CoreMonad
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#endif
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type Expression = String
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type ModuleString = String
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----------------------------------------------------------------
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typeExpr :: Options -> ModuleString -> Expression -> FilePath -> IO String
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typeExpr opt modstr expr file = (++ "\n") <$> Info.typeOf opt file modstr expr
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typeOf :: Options -> FilePath -> ModuleString -> Expression -> IO String
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typeOf opt fileName modstr expr = inModuleContext opt fileName modstr exprToType
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where
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exprToType = pretty <$> GHC.exprType expr
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pretty :: Type -> String
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pretty = showSDocForUser neverQualify . pprTypeForUser False
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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") <$> info opt file modstr expr
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info :: Options -> FilePath -> ModuleString -> FilePath -> IO String
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info opt fileName modstr expr = inModuleContext opt fileName modstr exprToInfo
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where
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exprToInfo = infoThing expr
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----------------------------------------------------------------
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annotExpr :: Options -> ModuleString -> Int -> Int -> FilePath -> IO String
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annotExpr opt modstr lineNo colNo file = (++ "\n") <$> annotOf opt file modstr lineNo colNo
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annotOf :: Options -> FilePath -> ModuleString -> Int -> Int -> IO String
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annotOf 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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es <- liftIO $ findExpr tcm lineNo colNo
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ts <- catMaybes <$> mapM (getType tcm) es
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let ts' = sortBy (\a b -> fst a `cmp` fst b) ts
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return $ tolisp $ map (\(loc, e) -> ("(" ++ l loc ++ " " ++ show (pretty e) ++ ")")) ts'
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l :: SrcSpan -> String
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#if __GLASGOW_HASKELL__ >= 702
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l (RealSrcSpan spn)
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#else
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l spn | isGoodSrcSpan spn
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#endif
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= ("("++) . (++")") . unwords . map show $
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[ srcSpanStartLine spn, srcSpanStartCol spn
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, srcSpanEndLine spn, srcSpanEndCol spn ]
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l _ = "(0 0 0 0)"
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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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tolisp ls = "(" ++ unwords ls ++ ")"
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findExpr :: TypecheckedModule -> Int -> Int -> IO [LHsExpr Id]
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findExpr tcm line col = do
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let src = tm_typechecked_source tcm
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ssrc <- everywhereM' sanitize src
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return $ listify f ssrc
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where
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-- It is for GHC's panic!
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sanitize :: Data a => a -> IO a
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sanitize x = do
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mret <- try (evaluate x)
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return $ case mret of
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Left (SomeException _) -> G.empty
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Right ret -> ret
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f :: LHsExpr Id -> Bool
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f (L spn _) = spn `spans` (line, col)
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-- | Monadic variation on everywhere'
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everywhereM' :: Monad m => GenericM m -> GenericM m
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everywhereM' f x = do
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x' <- f x
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gmapM (everywhereM' f) 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) <- 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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----------------------------------------------------------------
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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 fix
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| fix == defaultFixity = Outputable.empty
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| otherwise = ppr fix <+> 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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#if __GLASGOW_HASKELL__ >= 702
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importsBuf = stringToStringBuffer . unlines $ header
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#else
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importsBuf <- liftIO . stringToStringBuffer . unlines $ header
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#endif
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clkTime <- 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 = do
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ms <- depanal [] False
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#if __GLASGOW_HASKELL__ >= 704
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top <- map (IIModule . ms_mod) <$> filterM isTop ms
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setContext top
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#else
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top <- map ms_mod <$> filterM isTop ms
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setContext top []
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#endif
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return (not . null $ top)
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where
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isTop ms = lookupMod `gcatch` returnFalse
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where
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lookupMod = lookupModule (ms_mod_name ms) Nothing >> return True
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returnFalse = constE $ return False
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----------------------------------------------------------------
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constE :: a -> (SomeException -> a)
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constE func = \_ -> func
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