ghc-mod/Language/Haskell/GhcMod/Browse.hs

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module Language.Haskell.GhcMod.Browse (
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browse
) where
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import Control.Applicative ((<$>))
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import Control.Exception (SomeException(..))
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import Data.Char (isAlpha)
import Data.List (sort)
import Data.Maybe (catMaybes)
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import Exception (ghandle)
import FastString (mkFastString)
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import GHC (GhcException(CmdLineError), ModuleInfo, Name, TyThing, DynFlags, Type, TyCon)
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import qualified GHC as G
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import Language.Haskell.GhcMod.Convert
import Language.Haskell.GhcMod.Doc (showPage, styleUnqualified)
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import Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Monad (GhcModT, options)
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import Language.Haskell.GhcMod.Target (setTargetFiles)
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import Language.Haskell.GhcMod.Types
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import Name (getOccString)
import Outputable (ppr, Outputable)
import TyCon (isAlgTyCon)
import Type (dropForAlls, splitFunTy_maybe, mkFunTy, isPredTy)
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----------------------------------------------------------------
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-- | Getting functions, classes, etc from a module.
-- If 'detailed' is 'True', their types are also obtained.
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-- If 'operators' is 'True', operators are also returned.
browse :: IOish m
=> ModuleString -- ^ A module name. (e.g. \"Data.List\")
-> GhcModT m String
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browse pkgmdl = convert' . sort =<< (listExports =<< getModule)
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where
(mpkg,mdl) = splitPkgMdl pkgmdl
mdlname = G.mkModuleName mdl
mpkgid = mkFastString <$> mpkg
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listExports Nothing = return []
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listExports (Just mdinfo) = processExports mdinfo
-- findModule works only for package modules, moreover,
-- you cannot load a package module. On the other hand,
-- to browse a local module you need to load it first.
-- If CmdLineError is signalled, we assume the user
-- tried browsing a local module.
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getModule = browsePackageModule `G.gcatch` fallback `G.gcatch` handler
browsePackageModule = G.findModule mdlname mpkgid >>= G.getModuleInfo
browseLocalModule = ghandle handler $ do
setTargetFiles [mdl]
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G.findModule mdlname Nothing >>= G.getModuleInfo
fallback (CmdLineError _) = browseLocalModule
fallback _ = return Nothing
handler (SomeException _) = return Nothing
-- |
--
-- >>> splitPkgMdl "base:Prelude"
-- (Just "base","Prelude")
-- >>> splitPkgMdl "Prelude"
-- (Nothing,"Prelude")
splitPkgMdl :: String -> (Maybe String,String)
splitPkgMdl pkgmdl = case break (==':') pkgmdl of
(mdl,"") -> (Nothing,mdl)
(pkg,_:mdl) -> (Just pkg,mdl)
-- Haskell 2010:
-- small -> ascSmall | uniSmall | _
-- ascSmall -> a | b | ... | z
-- uniSmall -> any Unicode lowercase letter
-- varid -> (small {small | large | digit | ' })
isNotOp :: String -> Bool
isNotOp (h:_) = isAlpha h || (h == '_')
isNotOp _ = error "isNotOp"
processExports :: IOish m => ModuleInfo -> GhcModT m [String]
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processExports minfo = do
opt <- options
let
removeOps
| operators opt = id
| otherwise = filter (isNotOp . getOccString)
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mapM (showExport opt minfo) $ removeOps $ G.modInfoExports minfo
showExport :: IOish m => Options -> ModuleInfo -> Name -> GhcModT m String
showExport opt minfo e = do
mtype' <- mtype
return $ concat $ catMaybes [mqualified, Just $ formatOp $ getOccString e, mtype']
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where
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mqualified = (G.moduleNameString (G.moduleName $ G.nameModule e) ++ ".") `justIf` qualified opt
mtype :: IOish m => GhcModT m (Maybe String)
mtype
| detailed opt = do
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tyInfo <- G.modInfoLookupName minfo e
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-- If nothing found, load dependent module and lookup global
tyResult <- maybe (inOtherModule e) (return . Just) tyInfo
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dflag <- G.getSessionDynFlags
return $ do
typeName <- tyResult >>= showThing dflag
(" :: " ++ typeName) `justIf` detailed opt
| otherwise = return Nothing
formatOp nm
| null nm = error "formatOp"
| isNotOp nm = nm
| otherwise = "(" ++ nm ++ ")"
inOtherModule :: IOish m => Name -> GhcModT m (Maybe TyThing)
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inOtherModule nm = G.getModuleInfo (G.nameModule nm) >> G.lookupGlobalName nm
justIf :: a -> Bool -> Maybe a
justIf x True = Just x
justIf _ False = Nothing
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showThing :: DynFlags -> TyThing -> Maybe String
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showThing dflag tything = showThing' dflag (fromTyThing tything)
showThing' :: DynFlags -> GapThing -> Maybe String
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showThing' dflag (GtA a) = Just $ formatType dflag a
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showThing' _ (GtT t) = unwords . toList <$> tyType t
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where
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toList t' = t' : getOccString t : map getOccString (G.tyConTyVars t)
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showThing' _ _ = Nothing
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formatType :: DynFlags -> Type -> String
formatType dflag a = showOutputable dflag (removeForAlls a)
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tyType :: TyCon -> Maybe String
tyType typ
| isAlgTyCon typ
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&& not (G.isNewTyCon typ)
&& not (G.isClassTyCon typ) = Just "data"
| G.isNewTyCon typ = Just "newtype"
| G.isClassTyCon typ = Just "class"
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| Gap.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
tty' = splitFunTy_maybe ty'
removeForAlls' :: Type -> Maybe (Type, Type) -> Type
removeForAlls' ty Nothing = ty
removeForAlls' ty (Just (pre, ftype))
| isPredTy pre = mkFunTy pre (dropForAlls ftype)
| otherwise = ty
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showOutputable :: Outputable a => DynFlags -> a -> String
showOutputable dflag = unwords . lines . showPage dflag styleUnqualified . ppr