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

module Distribution.Types.IncludeRenaming
  ( IncludeRenaming (..)
  , defaultIncludeRenaming
  , isDefaultIncludeRenaming
  ) where

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.Types.ModuleRenaming

import qualified Distribution.Compat.CharParsing as P
import Distribution.Parsec
import Distribution.Pretty
import Text.PrettyPrint (text)
import qualified Text.PrettyPrint as Disp

-- ---------------------------------------------------------------------------
-- Module renaming

-- | A renaming on an include: (provides renaming, requires renaming)
data IncludeRenaming = IncludeRenaming
  { IncludeRenaming -> ModuleRenaming
includeProvidesRn :: ModuleRenaming
  , IncludeRenaming -> ModuleRenaming
includeRequiresRn :: ModuleRenaming
  }
  deriving (Int -> IncludeRenaming -> ShowS
[IncludeRenaming] -> ShowS
IncludeRenaming -> String
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Generic)

instance Binary IncludeRenaming
instance Structured IncludeRenaming

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

-- | The 'defaultIncludeRenaming' applied when you only @build-depends@
-- on a package.
defaultIncludeRenaming :: IncludeRenaming
defaultIncludeRenaming :: IncludeRenaming
defaultIncludeRenaming = ModuleRenaming -> ModuleRenaming -> IncludeRenaming
IncludeRenaming ModuleRenaming
defaultRenaming ModuleRenaming
defaultRenaming

-- | Is an 'IncludeRenaming' the default one?
isDefaultIncludeRenaming :: IncludeRenaming -> Bool
isDefaultIncludeRenaming :: IncludeRenaming -> Bool
isDefaultIncludeRenaming (IncludeRenaming ModuleRenaming
p ModuleRenaming
r) = ModuleRenaming -> Bool
isDefaultRenaming ModuleRenaming
p Bool -> Bool -> Bool
&& ModuleRenaming -> Bool
isDefaultRenaming ModuleRenaming
r

instance Pretty IncludeRenaming where
  pretty :: IncludeRenaming -> Doc
pretty (IncludeRenaming ModuleRenaming
prov_rn ModuleRenaming
req_rn) =
    ModuleRenaming -> Doc
forall a. Pretty a => a -> Doc
pretty ModuleRenaming
prov_rn
      Doc -> Doc -> Doc
<+> ( if ModuleRenaming -> Bool
isDefaultRenaming ModuleRenaming
req_rn
              then Doc
Disp.empty
              else String -> Doc
text String
"requires" Doc -> Doc -> Doc
<+> ModuleRenaming -> Doc
forall a. Pretty a => a -> Doc
pretty ModuleRenaming
req_rn
          )

instance Parsec IncludeRenaming where
  parsec :: forall (m :: * -> *). CabalParsing m => m IncludeRenaming
parsec = do
    ModuleRenaming
prov_rn <- m ModuleRenaming
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
forall (m :: * -> *). CabalParsing m => m ModuleRenaming
parsec
    ModuleRenaming
req_rn <- ModuleRenaming -> m ModuleRenaming -> m ModuleRenaming
forall (m :: * -> *) a. Alternative m => a -> m a -> m a
P.option ModuleRenaming
defaultRenaming (m ModuleRenaming -> m ModuleRenaming)
-> m ModuleRenaming -> m ModuleRenaming
forall a b. (a -> b) -> a -> b
$ m ModuleRenaming -> m ModuleRenaming
forall a. m a -> m a
forall (m :: * -> *) a. Parsing m => m a -> m a
P.try (m ModuleRenaming -> m ModuleRenaming)
-> m ModuleRenaming -> m ModuleRenaming
forall a b. (a -> b) -> a -> b
$ do
      m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces -- no need to be space
      String
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forall (m :: * -> *). CharParsing m => String -> m String
P.string String
"requires"
      m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces
      m ModuleRenaming
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
forall (m :: * -> *). CabalParsing m => m ModuleRenaming
parsec
    -- Requirements don't really care if they're mentioned
    -- or not (since you can't thin a requirement.)  But
    -- we have a little hack in Configure to combine
    -- the provisions and requirements together before passing
    -- them to GHC, and so the most neutral choice for a requirement
    -- is for the "with" field to be False, so we correctly
    -- thin provisions.
    IncludeRenaming -> m IncludeRenaming
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (ModuleRenaming -> ModuleRenaming -> IncludeRenaming
IncludeRenaming ModuleRenaming
prov_rn ModuleRenaming
req_rn)