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|
----------------------------------------------------------------------
-- |
-- Module : ParseCFG
-- Maintainer : PL
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/03/21 22:31:51 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.2 $
--
-- Main parsing module for context-free grammars
-----------------------------------------------------------------------------
module GF.Parsing.ParseCFG (parse) where
import Char (toLower)
import GF.Parsing.Utilities
import GF.Parsing.CFGrammar
import qualified GF.Parsing.ParseCFG.General as PGen
import qualified GF.Parsing.ParseCFG.Incremental as PInc
parse :: (Ord n, Ord c, Ord t, Show t) =>
String -> CFParser n c t
parse = decodeParser . map toLower
decodeParser ['g',s] = PGen.parse (decodeStrategy s)
decodeParser ['i',s,f] = PInc.parse (decodeStrategy s, decodeFilter f)
decodeParser _ = decodeParser "ibn"
decodeStrategy 'b' = (True, False)
decodeStrategy 't' = (False, True)
decodeFilter 'a' = (True, True)
decodeFilter 'b' = (True, False)
decodeFilter 't' = (False, True)
decodeFilter 'n' = (False, False)
|
