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

module Distribution.Types.ModuleRenaming
  ( ModuleRenaming (..)
  , interpModuleRenaming
  , defaultRenaming
  , isDefaultRenaming
  ) where

import Distribution.CabalSpecVersion
import Distribution.Compat.Prelude hiding (empty)
import Prelude ()

import Distribution.ModuleName
import Distribution.Parsec
import Distribution.Pretty

import qualified Data.Map as Map
import qualified Data.Set as Set
import qualified Distribution.Compat.CharParsing as P
import Text.PrettyPrint (comma, hsep, parens, punctuate, text)

-- | Renaming applied to the modules provided by a package.
-- The boolean indicates whether or not to also include all of the
-- original names of modules.  Thus, @ModuleRenaming False []@ is
-- "don't expose any modules, and @ModuleRenaming True [("Data.Bool", "Bool")]@
-- is, "expose all modules, but also expose @Data.Bool@ as @Bool@".
-- If a renaming is omitted you get the 'DefaultRenaming'.
--
-- (NB: This is a list not a map so that we can preserve order.)
data ModuleRenaming
  = -- | A module renaming/thinning; e.g., @(A as B, C as C)@
    -- brings @B@ and @C@ into scope.
    ModuleRenaming [(ModuleName, ModuleName)]
  | -- | The default renaming, bringing all exported modules
    -- into scope.
    DefaultRenaming
  | -- | Hiding renaming, e.g., @hiding (A, B)@, bringing all
    -- exported modules into scope except the hidden ones.
    HidingRenaming [ModuleName]
  deriving (Int -> ModuleRenaming -> ShowS
[ModuleRenaming] -> ShowS
ModuleRenaming -> String
(Int -> ModuleRenaming -> ShowS)
-> (ModuleRenaming -> String)
-> ([ModuleRenaming] -> ShowS)
-> Show ModuleRenaming
forall a.
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$cshowsPrec :: Int -> ModuleRenaming -> ShowS
showsPrec :: Int -> ModuleRenaming -> ShowS
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show :: ModuleRenaming -> String
$cshowList :: [ModuleRenaming] -> ShowS
showList :: [ModuleRenaming] -> ShowS
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readsPrec :: Int -> ReadS ModuleRenaming
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readListPrec :: ReadPrec [ModuleRenaming]
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(ModuleRenaming -> ModuleRenaming -> Ordering)
-> (ModuleRenaming -> ModuleRenaming -> Bool)
-> (ModuleRenaming -> ModuleRenaming -> Bool)
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-> (ModuleRenaming -> ModuleRenaming -> Bool)
-> (ModuleRenaming -> ModuleRenaming -> ModuleRenaming)
-> (ModuleRenaming -> ModuleRenaming -> ModuleRenaming)
-> Ord ModuleRenaming
ModuleRenaming -> ModuleRenaming -> Bool
ModuleRenaming -> ModuleRenaming -> Ordering
ModuleRenaming -> ModuleRenaming -> ModuleRenaming
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max :: ModuleRenaming -> ModuleRenaming -> ModuleRenaming
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min :: ModuleRenaming -> ModuleRenaming -> ModuleRenaming
Ord, Typeable, Typeable ModuleRenaming
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 -> (forall g. g -> c g) -> ModuleRenaming -> c ModuleRenaming)
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-> (forall x. Rep ModuleRenaming x -> ModuleRenaming)
-> Generic ModuleRenaming
forall x. Rep ModuleRenaming x -> ModuleRenaming
forall x. ModuleRenaming -> Rep ModuleRenaming x
forall a.
(forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a
$cfrom :: forall x. ModuleRenaming -> Rep ModuleRenaming x
from :: forall x. ModuleRenaming -> Rep ModuleRenaming x
$cto :: forall x. Rep ModuleRenaming x -> ModuleRenaming
to :: forall x. Rep ModuleRenaming x -> ModuleRenaming
Generic)

-- | Interpret a 'ModuleRenaming' as a partial map from 'ModuleName'
-- to 'ModuleName'.  For efficiency, you should partially apply it
-- with 'ModuleRenaming' and then reuse it.
interpModuleRenaming :: ModuleRenaming -> ModuleName -> Maybe ModuleName
interpModuleRenaming :: ModuleRenaming -> ModuleName -> Maybe ModuleName
interpModuleRenaming ModuleRenaming
DefaultRenaming = ModuleName -> Maybe ModuleName
forall a. a -> Maybe a
Just
interpModuleRenaming (ModuleRenaming [(ModuleName, ModuleName)]
rns) =
  let m :: Map ModuleName ModuleName
m = [(ModuleName, ModuleName)] -> Map ModuleName ModuleName
forall k a. Ord k => [(k, a)] -> Map k a
Map.fromList [(ModuleName, ModuleName)]
rns
   in \ModuleName
k -> ModuleName -> Map ModuleName ModuleName -> Maybe ModuleName
forall k a. Ord k => k -> Map k a -> Maybe a
Map.lookup ModuleName
k Map ModuleName ModuleName
m
interpModuleRenaming (HidingRenaming [ModuleName]
hs) =
  let s :: Set ModuleName
s = [ModuleName] -> Set ModuleName
forall a. Ord a => [a] -> Set a
Set.fromList [ModuleName]
hs
   in \ModuleName
k -> if ModuleName
k ModuleName -> Set ModuleName -> Bool
forall a. Ord a => a -> Set a -> Bool
`Set.member` Set ModuleName
s then Maybe ModuleName
forall a. Maybe a
Nothing else ModuleName -> Maybe ModuleName
forall a. a -> Maybe a
Just ModuleName
k

-- | The default renaming, if something is specified in @build-depends@
-- only.
defaultRenaming :: ModuleRenaming
defaultRenaming :: ModuleRenaming
defaultRenaming = ModuleRenaming
DefaultRenaming

-- | Tests if its the default renaming; we can use a more compact syntax
-- in 'Distribution.Types.IncludeRenaming.IncludeRenaming' in this case.
isDefaultRenaming :: ModuleRenaming -> Bool
isDefaultRenaming :: ModuleRenaming -> Bool
isDefaultRenaming ModuleRenaming
DefaultRenaming = Bool
True
isDefaultRenaming ModuleRenaming
_ = Bool
False

instance Binary ModuleRenaming
instance Structured ModuleRenaming

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

-- NB: parentheses are mandatory, because later we may extend this syntax
-- to allow "hiding (A, B)" or other modifier words.
instance Pretty ModuleRenaming where
  pretty :: ModuleRenaming -> Doc
pretty ModuleRenaming
DefaultRenaming = Doc
forall a. Monoid a => a
mempty
  pretty (HidingRenaming [ModuleName]
hides) =
    String -> Doc
text String
"hiding" Doc -> Doc -> Doc
<+> Doc -> Doc
parens ([Doc] -> Doc
hsep (Doc -> [Doc] -> [Doc]
punctuate Doc
comma ((ModuleName -> Doc) -> [ModuleName] -> [Doc]
forall a b. (a -> b) -> [a] -> [b]
map ModuleName -> Doc
forall a. Pretty a => a -> Doc
pretty [ModuleName]
hides)))
  pretty (ModuleRenaming [(ModuleName, ModuleName)]
rns) =
    Doc -> Doc
parens (Doc -> Doc) -> ([Doc] -> Doc) -> [Doc] -> Doc
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [Doc] -> Doc
hsep ([Doc] -> Doc) -> [Doc] -> Doc
forall a b. (a -> b) -> a -> b
$ Doc -> [Doc] -> [Doc]
punctuate Doc
comma (((ModuleName, ModuleName) -> Doc)
-> [(ModuleName, ModuleName)] -> [Doc]
forall a b. (a -> b) -> [a] -> [b]
map (ModuleName, ModuleName) -> Doc
forall {a}. (Eq a, Pretty a) => (a, a) -> Doc
dispEntry [(ModuleName, ModuleName)]
rns)
    where
      dispEntry :: (a, a) -> Doc
dispEntry (a
orig, a
new)
        | a
orig a -> a -> Bool
forall a. Eq a => a -> a -> Bool
== a
new = a -> Doc
forall a. Pretty a => a -> Doc
pretty a
orig
        | Bool
otherwise = a -> Doc
forall a. Pretty a => a -> Doc
pretty a
orig Doc -> Doc -> Doc
<+> String -> Doc
text String
"as" Doc -> Doc -> Doc
<+> a -> Doc
forall a. Pretty a => a -> Doc
pretty a
new

instance Parsec ModuleRenaming where
  parsec :: forall (m :: * -> *). CabalParsing m => m ModuleRenaming
parsec = do
    csv <- m CabalSpecVersion
forall (m :: * -> *). CabalParsing m => m CabalSpecVersion
askCabalSpecVersion
    if csv >= CabalSpecV3_0
      then moduleRenamingParsec parensLax lexemeParsec
      else moduleRenamingParsec parensStrict parsec
    where
      -- For cabal spec versions < 3.0 white spaces were not skipped
      -- after the '(' and ')' tokens in the mixin field. This
      -- parser checks the cabal file version and does the correct
      -- skipping of spaces.
      parensLax :: m a -> m a
parensLax m a
p = m () -> m () -> m a -> m a
forall (m :: * -> *) bra ket a.
Applicative m =>
m bra -> m ket -> m a -> m a
P.between (Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
'(' m Char -> m () -> m ()
forall a b. m a -> m b -> m b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces) (Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
')' m Char -> m () -> m ()
forall a b. m a -> m b -> m b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces) m a
p
      parensStrict :: m a -> m a
parensStrict m a
p = m (Maybe Any) -> m Char -> m a -> m a
forall (m :: * -> *) bra ket a.
Applicative m =>
m bra -> m ket -> m a -> m a
P.between (Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
'(' m Char -> m (Maybe Any) -> m (Maybe Any)
forall a b. m a -> m b -> m b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> m (Maybe Any)
forall {a}. m (Maybe a)
warnSpaces) (Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
')') m a
p

      warnSpaces :: m (Maybe a)
warnSpaces =
        m a -> m (Maybe a)
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
P.optional (m a -> m (Maybe a)) -> m a -> m (Maybe a)
forall a b. (a -> b) -> a -> b
$
          m Char
forall (m :: * -> *). CharParsing m => m Char
P.space m Char -> m a -> m a
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> String -> m a
forall a. String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"space after parenthesis, use cabal-version: 3.0 or higher"

moduleRenamingParsec
  :: CabalParsing m
  => (forall a. m a -> m a)
  -- ^ between parens
  -> m ModuleName
  -- ^ module name parser
  -> m ModuleRenaming
moduleRenamingParsec :: forall (m :: * -> *).
CabalParsing m =>
(forall a. m a -> m a) -> m ModuleName -> m ModuleRenaming
moduleRenamingParsec forall a. m a -> m a
bp m ModuleName
mn =
  -- NB: try not necessary as the first token is obvious
  [m ModuleRenaming] -> m ModuleRenaming
forall (m :: * -> *) a. Alternative m => [m a] -> m a
P.choice [m ModuleRenaming
parseRename, m ModuleRenaming
parseHiding, ModuleRenaming -> m ModuleRenaming
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return ModuleRenaming
DefaultRenaming]
  where
    cma :: m ()
cma = Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
',' m Char -> m () -> m ()
forall a b. m a -> m b -> m b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces
    parseRename :: m ModuleRenaming
parseRename = do
      rns <- m [(ModuleName, ModuleName)] -> m [(ModuleName, ModuleName)]
forall a. m a -> m a
bp m [(ModuleName, ModuleName)]
parseList
      P.spaces
      return (ModuleRenaming rns)
    parseHiding :: m ModuleRenaming
parseHiding = do
      _ <- String -> m String
forall (m :: * -> *). CharParsing m => String -> m String
P.string String
"hiding"
      P.spaces -- space isn't strictly required as next is an open paren
      hides <- bp (P.sepBy mn cma)
      return (HidingRenaming hides)
    parseList :: m [(ModuleName, ModuleName)]
parseList =
      m (ModuleName, ModuleName) -> m () -> m [(ModuleName, ModuleName)]
forall (m :: * -> *) a sep. Alternative m => m a -> m sep -> m [a]
P.sepBy m (ModuleName, ModuleName)
parseEntry m ()
cma
    parseEntry :: m (ModuleName, ModuleName)
parseEntry = do
      orig <- m ModuleName
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
forall (m :: * -> *). CabalParsing m => m ModuleName
parsec
      P.spaces
      P.option (orig, orig) $ do
        _ <- P.string "as"
        P.skipSpaces1 -- require space after "as"
        new <- parsec
        P.spaces
        return (orig, new)