add the FCFG parser

src/GF/Parsing/FCFG.hs

@@ -0,0 +1,38 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/05/11 10:28:16 $ 
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.5 $
+--
+-- MCFG parsing
+-----------------------------------------------------------------------------
+
+module GF.Parsing.FCFG
+    (parseFCF, module GF.Parsing.FCFG.PInfo) where
+
+import GF.Data.Operations (Err(..))
+
+import GF.Formalism.Utilities
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Parsing.FCFG.PInfo
+
+import qualified GF.Parsing.FCFG.Active as Active
+import GF.Infra.Print
+
+----------------------------------------------------------------------
+-- parsing
+
+parseFCF :: (Print c, Ord c, Print n, Ord n, Print t, Ord t) => String -> Err (FCFParser c n t)
+parseFCF prs | prs `elem` strategies = Ok $ parseFCF' prs
+	     | otherwise = Bad $ "FCFG parsing strategy not defined: " ++ prs 
+
+strategies = words "bottomup topdown"
+
+parseFCF' :: (Print c, Ord c, Print n, Ord n, Print t, Ord t) => String -> FCFParser c n t
+parseFCF' "bottomup" pinfo starts toks = Active.parse "b" pinfo starts toks 
+parseFCF' "topdown"  pinfo starts toks = Active.parse "t" pinfo starts toks