{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
module Distribution.SPDX.License (
    License (..),
    ) where

import Prelude ()
import Distribution.Compat.Prelude

import Distribution.Pretty
import Distribution.Parsec
import Distribution.SPDX.LicenseExpression

import qualified Distribution.Compat.CharParsing as P
import qualified Text.PrettyPrint as Disp

-- | Declared license.
-- See [section 3.15 of SPDX Specification 2.1](https://spdx.org/spdx-specification-21-web-version#h.1hmsyys)
--
-- /Note:/ the NOASSERTION case is omitted.
--
-- Old 'License' can be migrated using following rules:
--
-- * @AllRightsReserved@ and @UnspecifiedLicense@ to 'NONE'.
--   No license specified which legally defaults to /All Rights Reserved/.
--   The package may not be legally modified or redistributed by anyone but
--   the rightsholder.
--
-- * @OtherLicense@ can be converted to 'LicenseRef' pointing to the file
--   in the package.
--
-- * @UnknownLicense@ i.e. other licenses of the form @name-x.y@, should be
--   covered by SPDX license list, otherwise use 'LicenseRef'.
--
-- * @PublicDomain@ isn't covered. Consider using CC0.
--   See <https://wiki.spdx.org/view/Legal_Team/Decisions/Dealing_with_Public_Domain_within_SPDX_Files>
--   for more information.
--
data License
    = NONE
      -- ^ if the package contains no license information whatsoever; or
    | License LicenseExpression
      -- ^ A valid SPDX License Expression as defined in Appendix IV.
  deriving (Int -> License -> ShowS
[License] -> ShowS
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instance Binary License
instance Structured License

instance NFData License where
    rnf :: License -> ()
rnf License
NONE        = ()
    rnf (License LicenseExpression
l) = LicenseExpression -> ()
forall a. NFData a => a -> ()
rnf LicenseExpression
l

instance Pretty License where
    pretty :: License -> Doc
pretty License
NONE        = String -> Doc
Disp.text String
"NONE"
    pretty (License LicenseExpression
l) = LicenseExpression -> Doc
forall a. Pretty a => a -> Doc
pretty LicenseExpression
l

-- |
-- >>> eitherParsec "BSD-3-Clause AND MIT" :: Either String License
-- Right (License (EAnd (ELicense (ELicenseId BSD_3_Clause) Nothing) (ELicense (ELicenseId MIT) Nothing)))
--
-- >>> eitherParsec "NONE" :: Either String License
-- Right NONE
--
instance Parsec License where
    parsec :: m License
parsec = License
NONE License -> m String -> m License
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