73 lines
2.1 KiB
Haskell
73 lines
2.1 KiB
Haskell
module Info where
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import Control.Applicative hiding (empty)
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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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----------------------------------------------------------------
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typeExpr :: Options -> String -> String -> IO String
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typeExpr _ expr file = (++ "\n") <$> typeOf file expr
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typeOf :: String -> String -> IO String
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typeOf fileName expr = withGHC $ do
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initSession []
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setTargetFile fileName
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load LoadAllTargets
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setContextFromTarget
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pretty <$> exprType expr
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where
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pretty = showSDocForUser neverQualify . pprTypeForUser False
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----------------------------------------------------------------
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infoExpr :: Options -> String -> String -> IO String
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infoExpr _ expr file = (++ "\n") <$> info file expr
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info :: String -> String -> IO String
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info fileName expr = withGHC $ do
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initSession []
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setTargetFile fileName
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load LoadAllTargets
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setContextFromTarget
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infoThing expr
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where
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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 ()
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setContextFromTarget = do
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ms <- depanal [] False
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mdl <- findModule (ms_mod_name (head ms)) Nothing
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setContext [mdl] []
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