    {-# 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
    name Doc -> Doc -> Doc
    <+> VersionRange -> Doc
    forall a. Pretty a => a -> Doc
    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 :: forall (m :: * -> *). CabalParsing m => m PackageVersionConstraint
    parsec = do
        PackageIdentifier name ver <- m PackageIdentifier
    forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
    forall (m :: * -> *). CabalParsing m => m PackageIdentifier
    parsec
        if ver == nullVersion
          then do
            P.spaces
            vr <- parsec <|> return anyVersion
            P.spaces
            return (PackageVersionConstraint name vr)
          else pure (PackageVersionConstraint name (thisVersion 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)