107 lines
3.7 KiB
Haskell
107 lines
3.7 KiB
Haskell
module Language.Haskell.GhcMod.Browse (browseModule, browse) where
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import Control.Applicative
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import Data.Char
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import Data.List
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import Data.Maybe (fromMaybe)
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import DataCon (dataConRepType)
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import GHC
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import Language.Haskell.GhcMod.Doc
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import qualified Language.Haskell.GhcMod.Gap as Gap
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import Language.Haskell.GhcMod.GHCApi
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import Language.Haskell.GhcMod.Types
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import Name
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import Outputable
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import TyCon
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import Type
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import Var
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----------------------------------------------------------------
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-- | Getting functions, classes, etc from a module.
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-- If 'detailed' is 'True', their types are also obtained.
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browseModule :: Options
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-> ModuleString -- ^ A module name. (e.g. \"Data.List\")
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-> IO String
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browseModule opt mdlName = convert opt . format <$> withGHCDummyFile (browse opt mdlName)
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where
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format
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| operators opt = formatOps
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| otherwise = removeOps
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removeOps = sort . filter (isAlpha.head)
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formatOps = sort . map formatOps'
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formatOps' x@(s:_)
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| isAlpha s = x
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| otherwise = "(" ++ name ++ ")" ++ tail_
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where
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(name, tail_) = break isSpace x
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formatOps' [] = error "formatOps'"
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-- | Getting functions, classes, etc from a module.
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-- If 'detailed' is 'True', their types are also obtained.
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browse :: Options
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-> ModuleString -- ^ A module name. (e.g. \"Data.List\")
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-> Ghc [String]
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browse opt mdlName = do
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initializeFlags opt
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getModule >>= getModuleInfo >>= listExports
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where
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getModule = findModule (mkModuleName mdlName) Nothing
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listExports Nothing = return []
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listExports (Just mdinfo)
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| detailed opt = processModule mdinfo
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| otherwise = return (processExports mdinfo)
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processExports :: ModuleInfo -> [String]
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processExports = map getOccString . modInfoExports
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processModule :: ModuleInfo -> Ghc [String]
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processModule minfo = mapM processName names
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where
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names = modInfoExports minfo
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processName :: Name -> Ghc String
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processName nm = do
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tyInfo <- modInfoLookupName minfo nm
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-- If nothing found, load dependent module and lookup global
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tyResult <- maybe (inOtherModule nm) (return . Just) tyInfo
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dflag <- getSessionDynFlags
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return $ fromMaybe (getOccString nm) (tyResult >>= showThing dflag)
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inOtherModule :: Name -> Ghc (Maybe TyThing)
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inOtherModule nm = getModuleInfo (nameModule nm) >> lookupGlobalName nm
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showThing :: DynFlags -> TyThing -> Maybe String
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showThing dflag (AnId i) = Just $ formatType dflag varType i
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showThing dflag (ADataCon d) = Just $ formatType dflag dataConRepType d
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showThing _ (ATyCon t) = unwords . toList <$> tyType t
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where
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toList t' = t' : getOccString t : map getOccString (tyConTyVars t)
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showThing _ _ = Nothing
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formatType :: NamedThing a => DynFlags -> (a -> Type) -> a -> String
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formatType dflag f x = getOccString x ++ " :: " ++ showOutputable dflag (removeForAlls $ f x)
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tyType :: TyCon -> Maybe String
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tyType typ
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| isAlgTyCon typ
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&& not (isNewTyCon typ)
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&& not (isClassTyCon typ) = Just "data"
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| isNewTyCon typ = Just "newtype"
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| isClassTyCon typ = Just "class"
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| isSynTyCon typ = Just "type"
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| otherwise = Nothing
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removeForAlls :: Type -> Type
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removeForAlls ty = removeForAlls' ty' tty'
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where
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ty' = dropForAlls ty
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tty' = splitFunTy_maybe ty'
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removeForAlls' :: Type -> Maybe (Type, Type) -> Type
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removeForAlls' ty Nothing = ty
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removeForAlls' ty (Just (pre, ftype))
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| isPredTy pre = mkFunTy pre (dropForAlls ftype)
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| otherwise = ty
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showOutputable :: Outputable a => DynFlags -> a -> String
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showOutputable dflag = unwords . lines . Gap.showUnqualifiedPage dflag . ppr
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