{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
module Distribution.Types.PackageVersionConstraint
  ( PackageVersionConstraint(..)
  ) where

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.Parsec
import Distribution.Pretty
import Distribution.Types.PackageName
import Distribution.Types.VersionRange

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

-- | A version constraint on a package. Different from 'ExeDependency' and
-- 'Dependency' since it does not specify the need for a component, not even
-- the main library.
-- There are a few places in the codebase where 'Dependency' is used where
-- 'PackageVersionConstraint' should be used instead (#5570).
data PackageVersionConstraint = PackageVersionConstraint PackageName VersionRange
                  deriving ((forall x.
 PackageVersionConstraint -> Rep PackageVersionConstraint x)
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instance Binary PackageVersionConstraint
instance Structured PackageVersionConstraint
instance NFData PackageVersionConstraint where rnf :: PackageVersionConstraint -> ()
rnf = PackageVersionConstraint -> ()
forall a. (Generic a, GNFData (Rep a)) => a -> ()
genericRnf

instance Pretty PackageVersionConstraint where
  pretty :: PackageVersionConstraint -> Doc
pretty (PackageVersionConstraint PackageName
name VersionRange
ver) = PackageName -> Doc
forall a. Pretty a => a -> Doc
pretty PackageName
name Doc -> Doc -> Doc
<+> VersionRange -> Doc
forall a. Pretty a => a -> Doc
pretty VersionRange
ver

instance Parsec PackageVersionConstraint where
  parsec :: m PackageVersionConstraint
parsec = do
      PackageName
name <- m PackageName
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
parsec
      m ()
forall (m :: * -> *). CharParsing m => m ()
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      VersionRange
ver <- m VersionRange
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<|> VersionRange -> m VersionRange
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return VersionRange
anyVersion
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      PackageVersionConstraint -> m PackageVersionConstraint
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return (PackageName -> VersionRange -> PackageVersionConstraint
PackageVersionConstraint PackageName
name VersionRange
ver)