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|
{-# LANGUAGE FlexibleInstances #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-# OPTIONS_HADDOCK hide #-}
-----------------------------------------------------------------------------
-- |
-- Module : Haddock.GhcUtils
-- Copyright : (c) David Waern 2006-2009
-- License : BSD-like
--
-- Maintainer : haddock@projects.haskell.org
-- Stability : experimental
-- Portability : portable
--
-- Utils for dealing with types from the GHC API
-----------------------------------------------------------------------------
module Haddock.GhcUtils where
import Data.Version
import qualified Data.Map as Map
import Control.Arrow
import Data.Foldable hiding (concatMap)
import Data.Traversable
import Distribution.Compat.ReadP
import Distribution.Text
import Outputable
import Name
import Packages
import Module
import RdrName (GlobalRdrEnv)
import HscTypes
import LazyUniqFM
import GHC
moduleString :: Module -> String
moduleString = moduleNameString . moduleName
-- return the name of the package, with version info
modulePackageString :: Module -> String
modulePackageString = packageIdString . modulePackageId
-- return the (name,version) of the package
modulePackageInfo :: Module -> (String, [Char])
modulePackageInfo modu = case unpackPackageId pkg of
Nothing -> (packageIdString pkg, "")
Just x -> (display $ pkgName x, showVersion (pkgVersion x))
where pkg = modulePackageId modu
-- This was removed from GHC 6.11
-- XXX we shouldn't be using it, probably
-- | Try and interpret a GHC 'PackageId' as a cabal 'PackageIdentifer'. Returns @Nothing@ if
-- we could not parse it as such an object.
unpackPackageId :: PackageId -> Maybe PackageIdentifier
unpackPackageId p
= case [ pid | (pid,"") <- readP_to_S parse str ] of
[] -> Nothing
(pid:_) -> Just pid
where str = packageIdString p
mkModuleNoPackage :: String -> Module
mkModuleNoPackage str = mkModule (stringToPackageId "") (mkModuleName str)
lookupLoadedHomeModuleGRE :: GhcMonad m => ModuleName -> m (Maybe GlobalRdrEnv)
lookupLoadedHomeModuleGRE mod_name = withSession $ \hsc_env ->
case lookupUFM (hsc_HPT hsc_env) mod_name of
Just mod_info -> return (mi_globals (hm_iface mod_info))
_not_a_home_module -> return Nothing
instance (Outputable a, Outputable b) => Outputable (Map.Map a b) where
ppr m = ppr (Map.toList m)
isNameSym :: Name -> Bool
isNameSym = isSymOcc . nameOccName
isVarSym :: OccName -> Bool
isVarSym = isLexVarSym . occNameFS
getMainDeclBinder :: HsDecl name -> Maybe name
getMainDeclBinder (TyClD d) = Just (tcdName d)
getMainDeclBinder (ValD d)
= case collectHsBindBinders d of
[] -> Nothing
(name:_) -> Just name
getMainDeclBinder (SigD d) = sigNameNoLoc d
getMainDeclBinder (ForD (ForeignImport name _ _)) = Just (unLoc name)
getMainDeclBinder (ForD (ForeignExport _ _ _)) = Nothing
getMainDeclBinder _ = Nothing
isTyClD :: HsDecl a -> Bool
isTyClD (TyClD _) = True
isTyClD _ = False
isClassD :: HsDecl a -> Bool
isClassD (TyClD d) = isClassDecl d
isClassD _ = False
isDocD :: HsDecl a -> Bool
isDocD (DocD _) = True
isDocD _ = False
isInstD :: HsDecl a -> Bool
isInstD (InstD _) = True
isInstD (TyClD d) = isFamInstDecl d
isInstD _ = False
declATs :: HsDecl a -> [a]
declATs (TyClD d) | isClassDecl d = map (tcdName . unL) $ tcdATs d
declATs _ = []
pretty :: Outputable a => a -> String
pretty x = showSDoc (ppr x)
trace_ppr :: Outputable a => a -> b -> b
trace_ppr x y = trace (pretty x) y
-------------------------------------------------------------------------------
-- Located
-------------------------------------------------------------------------------
unL :: Located a -> a
unL (L _ x) = x
reL :: a -> Located a
reL = L undefined
instance Foldable Located where
foldMap f (L _ x) = f x
instance Traversable Located where
mapM f (L l x) = (return . L l) =<< f x
-------------------------------------------------------------------------------
-- NamedThing instances
-------------------------------------------------------------------------------
instance NamedThing (TyClDecl Name) where
getName = tcdName
instance NamedThing (ConDecl Name) where
getName = unL . con_name
-------------------------------------------------------------------------------
-- Subordinates
-------------------------------------------------------------------------------
class Parent a where
children :: a -> [Name]
instance Parent (ConDecl Name) where
children con =
case con_details con of
RecCon fields -> map (unL . cd_fld_name) fields
_ -> []
instance Parent (TyClDecl Name) where
children d
| isDataDecl d = map (unL . con_name . unL) . tcdCons $ d
| isClassDecl d =
map (tcdName . unL) (tcdATs d) ++
[ unL n | L _ (TypeSig n _) <- tcdSigs d ]
| otherwise = []
-- | A parent and its children
family :: (NamedThing a, Parent a) => a -> (Name, [Name])
family = getName &&& children
-- | A mapping from the parent (main-binder) to its children and from each
-- child to its grand-children, recursively.
families :: TyClDecl Name -> [(Name, [Name])]
families d
| isDataDecl d = family d : map (family . unL) (tcdCons d)
| isClassDecl d = family d : concatMap (families . unL) (tcdATs d)
| otherwise = []
-- | A mapping from child to parent
parentMap :: TyClDecl Name -> [(Name, Name)]
parentMap d = [ (c, p) | (p, cs) <- families d, c <- cs ]
-- | The parents of a subordinate in a declaration
parents :: Name -> HsDecl Name -> [Name]
parents n (TyClD d) = [ p | (c, p) <- parentMap d, c == n ]
parents _ _ = []
|
