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/CF.hs

@@ -0,0 +1,66 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/04/21 16:23:04 $ 
+-- > CVS $Author: bringert $
+-- > CVS $Revision: 1.4 $
+--
+-- Chart parsing of grammars in CF format
+-----------------------------------------------------------------------------
+
+module GF.Parsing.CF (parse) where
+
+import GF.Data.Operations (errVal)
+
+import GF.System.Tracing
+import GF.Infra.Print
+
+import GF.Data.SortedList (nubsort)
+import GF.Data.Assoc
+import qualified GF.CF.CF as CF
+import qualified GF.CF.CFIdent as CFI
+import GF.Formalism.Utilities
+import GF.Formalism.CFG
+import qualified GF.Parsing.CFG as P
+
+type Token    = CFI.CFTok
+type Name     = CFI.CFFun
+type Category = CFI.CFCat
+
+parse :: String -> CF.CF -> Category -> CF.CFParser
+parse = buildParser . errVal (errVal undefined (P.parseCF "")) . P.parseCF 
+
+buildParser :: P.CFParser Category Name Token -> CF.CF -> Category -> CF.CFParser
+buildParser parser cf start tokens = (parseResults, parseInformation)
+    where parseInformation = prtSep "\n" trees
+	  parseResults     = [ (tree2cfTree t, []) | t <- trees ]
+	  theInput = input tokens
+	  edges    = tracePrt "Parsing.CF - nr. edges" (prt.length) $
+		     parser pInf [start] theInput
+	  chart    = tracePrt "Parsing.CF - sz. chart" (prt . map (length.snd) . aAssocs) $
+		     grammar2chart $ map addCategory edges
+	  forests  = tracePrt "Parsing.CF - nr. forests" (prt.length) $
+		     chart2forests chart (const False) 
+		     [ uncurry Edge (inputBounds theInput) start ]
+	  trees    = tracePrt "Parsing.CF - nr. trees" (prt.length) $
+		     concatMap forest2trees forests
+	  pInf     = P.buildCFPInfo $ cf2grammar cf (nubsort tokens)
+	  
+
+addCategory (CFRule cat rhs name) = CFRule cat rhs (name, cat)
+
+tree2cfTree (TNode (name, Edge _ _ cat) trees) = CF.CFTree (name, (cat, map tree2cfTree trees))
+
+cf2grammar :: CF.CF -> [Token] -> CFGrammar Category Name Token
+cf2grammar cf tokens = [ CFRule cat rhs name |
+			 (name, (cat, rhs0)) <- cfRules, 
+			 rhs <- mapM item2symbol rhs0 ] 
+    where cfRules = concatMap (CF.predefRules (CF.predefOfCF cf)) tokens ++ 
+		    CF.rulesOfCF cf 
+	  item2symbol (CF.CFNonterm cat) = [Cat cat]
+	  item2symbol item = map Tok $ filter (CF.matchCFTerm item) tokens
+
+