- -- * The @Version@ type
- Version(..),
- -- * A concrete representation of @Version@
- showVersion, parseVersion,
+ -- * The @Version@ type
+ Version(..),
+ -- * A concrete representation of @Version@
+ showVersion, parseVersion,
-#if __GLASGOW_HASKELL__ < 603
-import Distribution.Compat.ReadP
-#else
+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__ || __HUGS__ || __NHC__
-#if __GLASGOW_HASKELL__ < 602
-import Data.Dynamic ( Typeable(..), TyCon, mkTyCon, mkAppTy )
+#if !__GLASGOW_HASKELL__
+import Data.Typeable ( Typeable, TyCon, mkTyCon, mkTyConApp )
-import Data.List ( intersperse )
-import Control.Monad ( liftM )
-import Data.Char ( isDigit, isAlphaNum )
+import Data.List ( intersperse, sort )
+import Control.Monad ( liftM )
+import Data.Char ( isDigit, isAlphaNum )
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
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.
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.
- -- ^ The numeric branch for this version. This reflects the
- -- fact that most software versions are tree-structured; there
- -- is a main trunk which is tagged with versions at various
- -- points (1,2,3...), and the first branch off the trunk after
- -- version 3 is 3.1, the second branch off the trunk after
- -- version 3 is 3.2, and so on. The tree can be branched
- -- arbitrarily, just by adding more digits.
- --
- -- We represent the branch as a list of 'Int', so
- -- version 3.2.1 becomes [3,2,1]. Lexicographic ordering
- -- (i.e. the default instance of 'Ord' for @[Int]@) gives
- -- the natural ordering of branches.
-
- versionTags :: [String] -- really a bag
- -- ^ A version can be tagged with an arbitrary list of strings.
- -- The interpretation of the list of tags is entirely dependent
- -- on the entity that this version applies to.
- }
+ -- ^ The numeric branch for this version. This reflects the
+ -- fact that most software versions are tree-structured; there
+ -- is a main trunk which is tagged with versions at various
+ -- points (1,2,3...), and the first branch off the trunk after
+ -- version 3 is 3.1, the second branch off the trunk after
+ -- version 3 is 3.2, and so on. The tree can be branched
+ -- arbitrarily, just by adding more digits.
+ --
+ -- We represent the branch as a list of 'Int', so
+ -- version 3.2.1 becomes [3,2,1]. Lexicographic ordering
+ -- (i.e. the default instance of 'Ord' for @[Int]@) gives
+ -- the natural ordering of branches.
+
+ versionTags :: [String] -- really a bag
+ -- ^ A version can be tagged with an arbitrary list of strings.
+ -- The interpretation of the list of tags is entirely dependent
+ -- on the entity that this version applies to.
+ }
-- | Provides one possible concrete representation for 'Version'. For
-- a version with 'versionBranch' @= [1,2,3]@ and 'versionTags'
-- | Provides one possible concrete representation for 'Version'. For
-- a version with 'versionBranch' @= [1,2,3]@ and 'versionTags'