"Committed_by_peb"

src/GF/Conversion/MCFGtoCFG.hs

@@ -0,0 +1,49 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/04/11 13:52:48 $ 
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.1 $
+--
+-- Converting MCFG grammars to (possibly overgenerating) CFG
+-----------------------------------------------------------------------------
+
+
+module GF.Conversion.MCFGtoCFG
+    (convertGrammar) where
+
+import GF.System.Tracing
+import GF.Infra.Print
+
+import Monad
+import GF.Formalism.Utilities
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.CFG
+import GF.Conversion.Types
+
+convertGrammar :: MGrammar -> CGrammar
+convertGrammar gram = tracePrt "#context-free rules" (prt.length) $
+		      concatMap convertRule gram
+
+convertRule :: MRule -> [CRule]
+convertRule (Rule (Abs cat args name) (Cnc _ _ record)) 
+    = [ CFRule (CCat cat lbl) rhs (CName name profile) |
+	Lin lbl lin <- record,
+	let rhs = map (mapSymbol convertArg id) lin,
+	let profile = map (argPlaces lin) [0 .. length args-1]
+      ]
+
+convertArg :: (MCat, MLabel, Int) -> CCat
+convertArg (cat, lbl, _) = CCat cat lbl
+
+argPlaces :: [Symbol (cat, lbl, Int) tok] -> Int -> [Int]
+argPlaces lin nr  = [ place | (nr', place) <- zip linArgs [0..], nr == nr' ]
+    where linArgs = [ nr' | (_, _, nr') <- filterCats lin ]
+
+
+
+