GF/src is now for 2.9, and the new sources are in src-3.0 - keep it this way until the release of GF 3

src-3.0/GF/Parsing/CFG.hs

@@ -0,0 +1,51 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/05/11 10:28:16 $ 
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.5 $
+--
+-- CFG parsing
+-----------------------------------------------------------------------------
+
+module GF.Parsing.CFG
+    (parseCF, module GF.Parsing.CFG.PInfo) where
+
+import GF.Data.Operations (Err(..))
+
+import GF.Formalism.Utilities
+import GF.Formalism.CFG
+import GF.Parsing.CFG.PInfo
+
+import qualified GF.Parsing.CFG.Incremental as Inc
+import qualified GF.Parsing.CFG.General as Gen
+
+----------------------------------------------------------------------
+-- parsing
+
+parseCF :: (Ord n, Ord c, Ord t) => String -> Err (CFParser c n t) 
+
+parseCF "bottomup" = Ok $ Gen.parse bottomup
+parseCF "topdown"  = Ok $ Gen.parse topdown
+
+parseCF "gb"    = Ok $ Gen.parse bottomup
+parseCF "gt"    = Ok $ Gen.parse topdown
+parseCF "ib"    = Ok $ Inc.parse (bottomup, noFilter)
+parseCF "it"    = Ok $ Inc.parse (topdown, noFilter)
+parseCF "ibFT"  = Ok $ Inc.parse (bottomup, topdown)
+parseCF "ibFB"  = Ok $ Inc.parse (bottomup, bottomup)
+parseCF "ibFTB" = Ok $ Inc.parse (bottomup, bothFilters)
+parseCF "itF"   = Ok $ Inc.parse (topdown, bottomup)
+
+-- error parser:
+parseCF prs = Bad $ "CFG parsing strategy not defined: " ++ prs
+
+bottomup = (True, False)
+topdown = (False, True)
+noFilter = (False, False)
+bothFilters = (True, True)
+
+