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

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.Parsec
import Distribution.Pretty
import Distribution.Types.PackageId
import Distribution.Types.PackageName
import Distribution.Types.Version
import Distribution.Types.VersionRange.Internal
import Distribution.Version                     (simplifyVersionRange)

import qualified Distribution.Compat.CharParsing as P

-- | 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' was used where
-- 'PackageVersionConstraint' is not 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
  -- Cannot do: PackageVersionConstraint have to be parseable
  -- as Dependency, due roundtrip problems. (e.g. talking to old ./Setup).
  --
  -- pretty (PackageVersionConstraint name (ThisVersion ver)) =
  --     pretty (PackageIdentifier name ver)
  pretty :: PackageVersionConstraint -> Doc
pretty (PackageVersionConstraint PackageName
name VersionRange
ver) =
      PackageName -> Doc
forall a. Pretty a => a -> Doc
pretty PackageName
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pretty VersionRange
ver

-- |
--
-- >>> simpleParsec "foo" :: Maybe PackageVersionConstraint
-- Just (PackageVersionConstraint (PackageName "foo") (OrLaterVersion (mkVersion [0])))
--
-- >>> simpleParsec "foo >=2.0" :: Maybe PackageVersionConstraint
-- Just (PackageVersionConstraint (PackageName "foo") (OrLaterVersion (mkVersion [2,0])))
--
-- >>> simpleParsec "foo-2.0" :: Maybe PackageVersionConstraint
-- Just (PackageVersionConstraint (PackageName "foo") (ThisVersion (mkVersion [2,0])))
--
instance Parsec PackageVersionConstraint where
  parsec :: m PackageVersionConstraint
parsec = do
      PackageIdentifier PackageName
name Version
ver <- m PackageIdentifier
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
parsec
      if Version
ver Version -> Version -> Bool
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== Version
nullVersion
      then do
          m ()
forall (m :: * -> *). CharParsing m => m ()
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          VersionRange
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return VersionRange
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      else
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PackageVersionConstraint PackageName
name (Version -> VersionRange
thisVersion Version
ver))

-- | @since 3.4.0.0
thisPackageVersionConstraint :: PackageIdentifier -> PackageVersionConstraint
thisPackageVersionConstraint :: PackageIdentifier -> PackageVersionConstraint
thisPackageVersionConstraint (PackageIdentifier PackageName
pn Version
vr) =
    PackageName -> VersionRange -> PackageVersionConstraint
PackageVersionConstraint PackageName
pn (Version -> VersionRange
thisVersion Version
vr)

-- | @since 3.4.0.0
simplifyPackageVersionConstraint :: PackageVersionConstraint -> PackageVersionConstraint
simplifyPackageVersionConstraint :: PackageVersionConstraint -> PackageVersionConstraint
simplifyPackageVersionConstraint (PackageVersionConstraint PackageName
pn VersionRange
vr) =
    PackageName -> VersionRange -> PackageVersionConstraint
PackageVersionConstraint PackageName
pn (VersionRange -> VersionRange
simplifyVersionRange VersionRange
vr)