{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}

module Distribution.Types.ModuleReexport (
    ModuleReexport(..)
) where

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.ModuleName
import Distribution.Parsec
import Distribution.Pretty
import Distribution.Types.PackageName

import qualified Distribution.Compat.CharParsing as P
import           Text.PrettyPrint           ((<+>))
import qualified Text.PrettyPrint           as Disp

-- -----------------------------------------------------------------------------
-- Module re-exports

data ModuleReexport = ModuleReexport {
       ModuleReexport -> Maybe PackageName
moduleReexportOriginalPackage :: Maybe PackageName,
       ModuleReexport -> ModuleName
moduleReexportOriginalName    :: ModuleName,
       ModuleReexport -> ModuleName
moduleReexportName            :: ModuleName
    }
    deriving (ModuleReexport -> ModuleReexport -> Bool
(ModuleReexport -> ModuleReexport -> Bool)
-> (ModuleReexport -> ModuleReexport -> Bool) -> Eq ModuleReexport
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
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Data)

instance Binary ModuleReexport
instance Structured ModuleReexport
instance NFData ModuleReexport where rnf :: ModuleReexport -> ()
rnf = ModuleReexport -> ()
forall a. (Generic a, GNFData (Rep a)) => a -> ()
genericRnf

instance Pretty ModuleReexport where
    pretty :: ModuleReexport -> Doc
pretty (ModuleReexport Maybe PackageName
mpkgname ModuleName
origname ModuleName
newname) =
          Doc -> (PackageName -> Doc) -> Maybe PackageName -> Doc
forall b a. b -> (a -> b) -> Maybe a -> b
maybe Doc
Disp.empty (\PackageName
pkgname -> PackageName -> Doc
forall a. Pretty a => a -> Doc
pretty PackageName
pkgname Doc -> Doc -> Doc
<<>> Char -> Doc
Disp.char Char
':') Maybe PackageName
mpkgname
       Doc -> Doc -> Doc
<<>> ModuleName -> Doc
forall a. Pretty a => a -> Doc
pretty ModuleName
origname
      Doc -> Doc -> Doc
<+> if ModuleName
newname ModuleName -> ModuleName -> Bool
forall a. Eq a => a -> a -> Bool
== ModuleName
origname
            then Doc
Disp.empty
            else String -> Doc
Disp.text String
"as" Doc -> Doc -> Doc
<+> ModuleName -> Doc
forall a. Pretty a => a -> Doc
pretty ModuleName
newname

instance Parsec ModuleReexport where
    parsec :: m ModuleReexport
parsec = do
        Maybe PackageName
mpkgname <- m PackageName -> m (Maybe PackageName)
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
P.optional (m PackageName -> m PackageName
forall (m :: * -> *) a. Parsing m => m a -> m a
P.try (m PackageName -> m PackageName) -> m PackageName -> m PackageName
forall a b. (a -> b) -> a -> b
$ m PackageName
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
parsec m PackageName -> m Char -> m PackageName
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<* Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
':')
        ModuleName
origname <- m ModuleName
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
parsec
        ModuleName
newname  <- ModuleName -> m ModuleName -> m ModuleName
forall (m :: * -> *) a. Alternative m => a -> m a -> m a
P.option ModuleName
origname (m ModuleName -> m ModuleName) -> m ModuleName -> m ModuleName
forall a b. (a -> b) -> a -> b
$ m ModuleName -> m ModuleName
forall (m :: * -> *) a. Parsing m => m a -> m a
P.try (m ModuleName -> m ModuleName) -> m ModuleName -> m ModuleName
forall a b. (a -> b) -> a -> b
$ do
            m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces
            String
_ <- String -> m String
forall (m :: * -> *). CharParsing m => String -> m String
P.string String
"as"
            m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces
            m ModuleName
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
parsec
        ModuleReexport -> m ModuleReexport
forall (m :: * -> *) a. Monad m => a -> m a
return (Maybe PackageName -> ModuleName -> ModuleName -> ModuleReexport
ModuleReexport Maybe PackageName
mpkgname ModuleName
origname ModuleName
newname)