107 lines
3.5 KiB
Haskell
107 lines
3.5 KiB
Haskell
module Info where
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import Control.Applicative hiding (empty)
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import Control.Monad
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import Data.Maybe
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import GHC
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import Outputable
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import PprTyThing
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import Types
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import NameSet
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import HscTypes
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import Data.List
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import Control.Exception
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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 _ modstr expr file = (++ "\n") <$> typeOf file modstr expr
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typeOf :: FilePath -> ModuleString-> Expression -> IO String
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typeOf fileName modstr expr = withGHC $ valid `gcatch` invalid
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where
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valid = makeTypeOf LoadAllTargets
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invalid = constE invalid0
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invalid0 = makeTypeOf $ LoadDependenciesOf (mkModuleName modstr)
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makeTypeOf x = do
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initSession ["-w"]
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setTargetFile fileName
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loadWithLogger (\_ -> return ()) x
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ok <- setContextFromTarget
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if ok
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then pretty <$> exprType expr
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else return "Its type cannot be guessed"
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pretty = showSDocForUser neverQualify . pprTypeForUser False
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----------------------------------------------------------------
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infoExpr :: Options -> ModuleString -> Expression -> FilePath -> IO String
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infoExpr _ modstr expr file = (++ "\n") <$> info file modstr expr
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info :: FilePath -> ModuleString -> FilePath -> IO String
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info fileName modstr expr = withGHC $ valid `gcatch` invalid
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where
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valid = makeInfo LoadAllTargets
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invalid = constE invalid0
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invalid0 = makeInfo $ LoadDependenciesOf (mkModuleName modstr)
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makeInfo x = do
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initSession ["-w"]
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setTargetFile fileName
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loadWithLogger (\_ -> return ()) x
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ok <- setContextFromTarget
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if ok
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then infoThing expr
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else return "Its info is not available"
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-- ghc/InteractiveUI.hs
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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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-- ghc/InteractiveUI.hs
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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, Fixity, [GHC.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 = empty
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| otherwise = ppr fix <+> ppr (getName thing)
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----------------------------------------------------------------
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setContextFromTarget :: Ghc Bool
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setContextFromTarget = do
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ms <- depanal [] False
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top <- map ms_mod <$> filterM isTop ms
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{-
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top is a set of this module and your-defined modules.
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If this module has syntax errors, it cannot be specified.
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And if there is no your-defined modules, top is [].
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In this case, we cannot obtain the type of an expression, sigh.
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-}
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setContext top []
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return $ if top == [] then False else True
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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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