-- | -- Module: Language.KURE.Rewrite -- Copyright: (c) 2006-2008 Andy Gill -- License: BSD3 -- -- Maintainer: Andy Gill <andygill@ku.edu> -- Stability: unstable -- Portability: ghc -- -- 'Rewrite' is a synonoym for a 'Translate' with the same source and target type. -- This module contains the defintion of Rewrite, and some aliases for some translate functions that use -- Rewrite rather than Translate. module Language.KURE.Rewrite ( Rewrite , rewrite , runRewrite ) where import Language.KURE.RewriteMonad import Language.KURE.Translate import Data.Monoid -- | A 'Rewrite' is a 'Translate' that shares the same source and target type. Literally, -- a 'Rewrite' provides the details about how to /re-write/ a specific type. type Rewrite m dec exp = Translate m dec exp exp -- | 'rewrite' is our primitive way of building a Rewrite, -- where if the rewrite is successful it is automatically marked as a non-identity rewrite. -- -- @rewrite $ \\ _ e -> return e@ /is not/ an identity rewrite. rewrite :: (Monoid dec, Monad m) => (exp1 -> RewriteM m dec exp1) -> Rewrite m dec exp1 rewrite = translate -- | 'runRewrite' executes the rewrite, returning either a failure message, -- or a success and the new parts of the environment. runRewrite :: (Monoid dec,Monad m) => Rewrite m dec exp -> dec -> exp -> m (Either String (exp,dec)) runRewrite = runTranslate