--
-- Maintainer : libraries@haskell.org
-- Stability : experimental
--- Portability : portable
+-- Portability : non-portable (local universal quantification in ReadP)
--
-- A general library for representation and manipulation of versions.
--
showVersion, parseVersion,
) where
+import Prelude -- necessary to get dependencies right
+
-- These #ifdefs are necessary because this code might be compiled as
-- part of ghc/lib/compat, and hence might be compiled by an older version
-- of GHC. In which case, we might need to pick up ReadP from
-- Distribution.Compat.ReadP, because the version in
-- Text.ParserCombinators.ReadP doesn't have all the combinators we need.
-#if __GLASGOW_HASKELL__ <= 602
-import Distribution.Compat.ReadP
-#else
+#if __GLASGOW_HASKELL__ >= 603 || __HUGS__ || __NHC__
import Text.ParserCombinators.ReadP
+#else
+import Distribution.Compat.ReadP
#endif
-#if __GLASGOW_HASKELL__ < 602
+#if !__GLASGOW_HASKELL__
+import Data.Typeable ( Typeable, TyCon, mkTyCon, mkTyConApp )
+#elif __GLASGOW_HASKELL__ < 602
import Data.Dynamic ( Typeable(..), TyCon, mkTyCon, mkAppTy )
#else
import Data.Typeable ( Typeable )
etc.). This is expected to be sufficient for many uses, but note that
you may need to use a more specific ordering for your versioning
scheme. For example, some versioning schemes may include pre-releases
-which have tags @"pre1"@, @"pre2"@, and so on, and these would need to
+which have tags @\"pre1\"@, @\"pre2\"@, and so on, and these would need to
be taken into account when determining ordering. In some cases, date
ordering may be more appropriate, so the application would have to
look for @date@ tags in the 'versionTags' field and compare those.
#endif
)
-#if __GLASGOW_HASKELL__ < 602
+#if !__GLASGOW_HASKELL__
+versionTc :: TyCon
+versionTc = mkTyCon "Version"
+
+instance Typeable Version where
+ typeOf _ = mkTyConApp versionTc []
+#elif __GLASGOW_HASKELL__ < 602
versionTc :: TyCon
-versionTc = mkTyCon "()"
+versionTc = mkTyCon "Version"
instance Typeable Version where
typeOf _ = mkAppTy versionTc []
-- | Provides one possible concrete representation for 'Version'. For
-- a version with 'versionBranch' @= [1,2,3]@ and 'versionTags'
--- @= ["tag1","tag2"]@, the output will be @1.2.3-tag1-tag2@.
+-- @= [\"tag1\",\"tag2\"]@, the output will be @1.2.3-tag1-tag2@.
--
showVersion :: Version -> String
showVersion (Version branch tags)
-- | A parser for versions in the format produced by 'showVersion'.
--
-#if __GLASGOW_HASKELL__ <= 602
-parseVersion :: ReadP r Version
-#else
+#if __GLASGOW_HASKELL__ >= 603 || __HUGS__
parseVersion :: ReadP Version
+#elif __NHC__
+parseVersion :: ReadPN r Version
+#else
+parseVersion :: ReadP r Version
#endif
parseVersion = do branch <- sepBy1 (liftM read $ munch1 isDigit) (char '.')
tags <- many (char '-' >> munch1 isAlphaNum)