ghc-mod/Info.hs

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{-# LANGUAGE CPP #-}
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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 Data.List
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import Data.Maybe
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import GHC
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import HscTypes
import NameSet
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import Outputable
import PprTyThing
import StringBuffer
import System.Time
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import Types
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#if __GLASGOW_HASKELL__ >= 702
import CoreMonad
#endif
type Expression = String
type ModuleString = String
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----------------------------------------------------------------
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typeExpr :: Options -> ModuleString -> Expression -> FilePath -> IO String
typeExpr opt modstr expr file = (++ "\n") <$> typeOf opt file modstr expr
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typeOf :: Options -> FilePath -> ModuleString -> Expression -> IO String
typeOf opt fileName modstr expr = inModuleContext opt fileName modstr exprToType
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where
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exprToType = pretty <$> exprType expr
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pretty = showSDocForUser neverQualify . pprTypeForUser False
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----------------------------------------------------------------
infoExpr :: Options -> ModuleString -> Expression -> FilePath -> IO String
infoExpr opt modstr expr file = (++ "\n") <$> info opt file modstr expr
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info :: Options -> FilePath -> ModuleString -> FilePath -> IO String
info opt fileName modstr expr = inModuleContext opt fileName modstr exprToInfo
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where
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exprToInfo = infoThing expr
----------------------------------------------------------------
-- from ghc/InteractiveUI.hs
infoThing :: String -> Ghc String
infoThing str = do
names <- parseName str
mb_stuffs <- mapM getInfo names
let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
unqual <- getPrintUnqual
return $ showSDocForUser unqual $ vcat (intersperse (text "") $ map (pprInfo False) filtered)
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filterOutChildren :: (a -> TyThing) -> [a] -> [a]
filterOutChildren get_thing xs
= [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
where
implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
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pprInfo :: PrintExplicitForalls -> (TyThing, Fixity, [Instance]) -> SDoc
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pprInfo pefas (thing, fixity, insts)
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= pprTyThingInContextLoc pefas thing
$$ show_fixity fixity
$$ vcat (map pprInstance insts)
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where
show_fixity fix
| fix == defaultFixity = empty
| otherwise = ppr fix <+> ppr (getName thing)
----------------------------------------------------------------
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inModuleContext :: Options -> FilePath -> ModuleString -> Ghc String -> IO String
inModuleContext opt fileName modstr action = withGHC valid
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where
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)
setTargetBuffer = do
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modgraph <- depanal [mkModuleName modstr] True
let imports = concatMap (map (showSDoc . ppr . unLoc)) $
map ms_imps modgraph ++ map ms_srcimps modgraph
moddef = "module " ++ sanitize modstr ++ " where"
header = moddef : imports
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#if __GLASGOW_HASKELL__ >= 702
importsBuf = stringToStringBuffer . unlines $ header
#else
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importsBuf <- liftIO . stringToStringBuffer . unlines $ header
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#endif
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clkTime <- liftIO getClockTime
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
errorMessage = "Couldn't determine type"
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setContextFromTarget :: Ghc Bool
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setContextFromTarget = do
ms <- depanal [] False
#if __GLASGOW_HASKELL__ >= 704
top <- map (IIModule . ms_mod) <$> filterM isTop ms
setContext top
#else
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top <- map ms_mod <$> filterM isTop ms
setContext top []
#endif
return (not . null $ top)
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where
isTop ms = lookupMod `gcatch` returnFalse
where
lookupMod = lookupModule (ms_mod_name ms) Nothing >> return True
returnFalse = constE $ return False
----------------------------------------------------------------
constE :: a -> (SomeException -> a)
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constE func = \_ -> func