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

9 files changed, 1762 insertions, 0 deletions

diff --git a/src-3.0/GF/Parsing/MCFG/Active.hs b/src-3.0/GF/Parsing/MCFG/Active.hs
new file mode 100644
index 000000000..c6e9c6b06
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/Active.hs
@@ -0,0 +1,318 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.5 $
+--
+-- MCFG parsing, the active algorithm
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.Active (parse, parseR) where
+
+import GF.Data.GeneralDeduction
+import GF.Data.Assoc
+
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+
+import GF.Parsing.MCFG.Range
+import GF.Parsing.MCFG.PInfo
+
+import GF.System.Tracing
+
+import Control.Monad (guard)
+
+import GF.Infra.Print
+
+----------------------------------------------------------------------
+-- * parsing
+
+parse :: (Ord n, Ord c, Ord l, Ord t) => String -> MCFParser c n l t
+parse strategy pinfo starts toks =
+    accumAssoc groupSyntaxNodes $
+      [ ((cat, found), SNode fun (zip rhs rrecs)) |
+        Final (Abs cat rhs fun) found rrecs <- chartLookup chart Fin ]
+    where chart = process strategy pinfo starts toks
+
+-- parseR :: (Ord n, Ord c, Ord l, Ord t) => String -> MCFParser c n l t
+parseR strategy pinfo starts =
+    accumAssoc groupSyntaxNodes $
+      [ ((cat, found), SNode fun (zip rhs rrecs))  |
+        Final (Abs cat rhs fun) found rrecs <- chartLookup chart Fin ]
+    where chart = processR strategy pinfo starts 
+
+process :: (Ord n, Ord c, Ord l, Ord t) => 
+	   String -> MCFPInfo c n l t -> [c] -> Input t -> AChart c n l
+process strategy pinfo starts toks 
+    = tracePrt "MCFG.Active - chart size" prtSizes $
+      buildChart keyof (complete : combine : convert : rules) axioms
+    where rules  | isNil strategy = [scan]
+		 | isBU  strategy = [scan, predictKilbury pinfo toks]
+		 | isTD  strategy = [scan, predictEarley pinfo toks]
+	  axioms | isNil strategy = predict pinfo toks
+		 | isBU  strategy = {- terminal pinfo toks ++ -} initialScan pinfo toks
+		 | isTD  strategy = initial pinfo starts toks
+
+--processR :: (Ord n, Ord c, Ord l) => 
+--	    String -> MCFPInfo c n l Range -> [c] -> AChart c n l
+processR strategy pinfo starts  
+    = tracePrt "MCFG.Active Range - chart size" prtSizes $
+      -- tracePrt "MCFG.Active Range - final chart" prtChart $
+      buildChart keyof (complete : combine : convert : rules) axioms
+    where rules  | isNil strategy = [scan]
+		 | isBU  strategy = [scan, predictKilburyR pinfo]
+		 | isTD  strategy = [scan, predictEarleyR pinfo]
+	  axioms | isNil strategy = predictR pinfo
+		 | isBU  strategy = {- terminalR pinfo ++ -} initialScanR pinfo
+		 | isTD  strategy = initialR pinfo starts
+
+isNil s = s=="n"
+isBU  s = s=="b"
+isTD  s = s=="t"
+
+-- used in prediction
+emptyChildren :: Abstract c n -> [RangeRec l]
+emptyChildren (Abs _ rhs _) = replicate (length rhs) []
+
+makeMaxRange (Range (_, j)) = Range (j, j)
+makeMaxRange EmptyRange     = EmptyRange
+
+
+----------------------------------------------------------------------
+-- * inference rules
+
+-- completion
+complete :: (Ord c, Ord n, Ord l) => AChart c n l -> Item c n l -> [Item c n l]
+complete _ (Active rule found rng (Lin l []) (lin:lins) recs) = 
+    return $ Active rule (found ++ [(l, rng)]) EmptyRange lin lins recs 
+complete _ _ = []
+
+-- scanning
+scan :: (Ord c, Ord n, Ord l) => AChart c n l -> Item c n l -> [Item c n l]
+scan _ (Active rule found rng (Lin l (Tok rng':syms)) lins recs) = 
+    do rng'' <- concatRange rng rng' 
+       return $ Active rule found rng'' (Lin l syms) lins recs 
+scan _ _ = []
+
+-- | Creates an Active Item every time it is possible to combine 
+-- an Active Item from the agenda with a Passive Item from the Chart 
+combine :: (Ord c, Ord n, Ord l) => AChart c n l -> Item c n l -> [Item c n l]
+combine chart item@(Active _ _ _ (Lin _ (Cat (c,_,_):_)) _ _) =
+    do Passive _c found <- chartLookup chart (Pass c)
+       combine2 chart found item
+combine chart (Passive c found) = 
+    do item <- chartLookup chart (Act c)
+       combine2 chart found item
+combine _ _ = []      
+
+combine2 chart found' (Active rule found rng (Lin l (Cat (c, r, d):syms)) lins recs) =
+    do rng' <- projection r found'
+       rng'' <- concatRange rng rng'
+       recs' <- unifyRec recs d found'
+       return $ Active rule found rng'' (Lin l syms) lins recs'
+
+-- | Active Items with nothing to find are converted to Final items,
+-- which in turn are converted to Passive Items
+convert :: (Ord c, Ord n, Ord l) => AChart c n l -> Item c n l -> [Item c n l]
+convert _ (Active rule found rng (Lin lbl []) [] recs) = 
+    return $ Final rule (found ++ [(lbl,rng)]) recs
+convert _ (Final (Abs cat _ _) found _) = 
+    return $ Passive cat found
+convert _ _ = []
+
+
+----------------------------------------------------------------------
+-- Naive --
+
+predict :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l]
+predict pinfo toks = tracePrt "MCFG.Active (Naive) - predicted rules" (prt . length) $
+		     do (Rule abs (Cnc _ _ lins)) <- rulesMatchingInput pinfo toks
+			(lin':lins') <- rangeRestRec toks lins
+			return $ Active abs [] EmptyRange lin' lins' (emptyChildren abs)
+
+
+----------------------------------------------------------------------
+-- NaiveR --
+
+predictR :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range -> [Item c n l]
+predictR pinfo = tracePrt "MCFG.Active (Naive Range) - predicted rules" (prt . length) $
+		 do (Rule abs (Cnc _ _ (lin:lins))) <- allRules pinfo 
+		    return $ Active abs [] EmptyRange lin lins (emptyChildren abs)
+
+
+----------------------------------------------------------------------
+-- Earley --
+
+-- anropas med alla startkategorier
+initial :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> [c] -> Input t -> [Item c n l]
+initial pinfo starts toks = 
+    tracePrt "MCFG.Active (Earley) - initial rules" (prt . length) $
+    do cat <- starts
+       Rule abs (Cnc _ _ lins) <- topdownRules pinfo ? cat
+       lin' : lins' <- rangeRestRec toks lins 
+       return $ Active abs [] (Range (0, 0)) lin' lins' (emptyChildren abs)
+
+predictEarley :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t
+	      -> AChart c n l -> Item c n l -> [Item c n l]
+predictEarley pinfo toks _ item@(Active (Abs _ _ f) _ rng (Lin _ (Cat (cat,_,_):_)) _ _) = 
+    topdownRules pinfo ? cat >>= predictEarley2 toks rng 
+predictEarley _ _ _ _ = []
+
+predictEarley2 :: (Ord c, Ord n, Ord l, Ord t) => Input t -> Range -> MCFRule c n l t -> [Item c n l]
+predictEarley2 toks _ (Rule abs@(Abs _ [] _) (Cnc _ _ lins)) = 
+    do lins' <- rangeRestRec toks lins 
+       return $ Final abs (makeRangeRec lins') []
+predictEarley2 toks rng (Rule abs (Cnc _ _ lins)) =
+    do lin' : lins' <- rangeRestRec toks lins 
+       return $ Active abs [] EmptyRange lin' lins' (emptyChildren abs)
+
+
+----------------------------------------------------------------------
+-- Earley Range --
+
+initialR :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range -> [c] -> [Item c n l]
+initialR pinfo starts = 
+    tracePrt "MCFG.Active (Earley Range) - initial rules" (prt . length) $
+    do cat <- starts
+       Rule abs (Cnc _ _ (lin : lins)) <- topdownRules pinfo ? cat
+       return $ Active abs [] (Range (0, 0)) lin lins (emptyChildren abs)
+
+predictEarleyR :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range
+	      -> AChart c n l -> Item c n l -> [Item c n l]
+predictEarleyR pinfo _ item@(Active (Abs _ _ f) _ rng (Lin _ (Cat (cat,_,_):_)) _ _) = 
+    topdownRules pinfo ? cat >>= predictEarleyR2 rng 
+predictEarleyR _ _ _ = []
+
+predictEarleyR2 :: (Ord c, Ord n, Ord l) => Range -> MCFRule c n l Range -> [Item c n l]
+predictEarleyR2 _ (Rule abs@(Abs _ [] _) (Cnc _ _ lins)) = 
+    return $ Final abs (makeRangeRec lins) []
+predictEarleyR2 rng (Rule abs (Cnc _ _ (lin : lins))) =
+    return $ Active abs [] EmptyRange lin lins (emptyChildren abs)
+
+
+----------------------------------------------------------------------
+-- Kilbury --
+
+-- terminal :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l]
+-- terminal pinfo toks = 
+--     tracePrt "MCFG.Active (Kilbury) - initial terminal rules" (prt . length) $
+--     do Rule abs (Cnc _ _ lins) <- emptyRules pinfo
+--        lins' <- rangeRestRec toks lins 
+--        return $ Final abs (makeRangeRec lins') []
+
+initialScan :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l]
+initialScan pinfo toks =
+    tracePrt "MCFG.Active (Kilbury) - initial scanned rules + epsilon rules" (prt . length) $
+    do tok <- aElems (inputToken toks)
+       Rule abs (Cnc _ _ lins) <- 
+           leftcornerTokens pinfo ? tok ++ 
+           epsilonRules pinfo
+       lin' : lins' <- rangeRestRec toks lins
+       return $ Active abs [] EmptyRange lin' lins' (emptyChildren abs)
+
+predictKilbury :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t
+	       -> AChart c n l -> Item c n l -> [Item c n l]
+predictKilbury pinfo toks _ (Passive cat found) = 
+    do Rule abs (Cnc _ _ (Lin l (Cat (_,r,i):syms) : lins)) <- leftcornerCats pinfo ? cat
+       lin' : lins' <- rangeRestRec toks (Lin l syms : lins)
+       rng <- projection r found
+       children <- unifyRec (emptyChildren abs) i found 
+       return $ Active abs [] rng lin' lins' children
+predictKilbury _ _ _ _ = []
+
+
+
+----------------------------------------------------------------------
+-- KilburyR --
+
+-- terminalR :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range -> [Item c n l]
+-- terminalR pinfo = 
+--     tracePrt "MCFG.Active (Kilbury Range) - initial terminal rules" (prt . length) $
+--     do Rule abs (Cnc _ _ lins) <- emptyRules pinfo
+--        return $ Final abs (makeRangeRec lins) []
+
+initialScanR :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range -> [Item c n l]
+initialScanR pinfo =
+    tracePrt "MCFG.Active (Kilbury Range) - initial scanned rules" (prt . length) $
+    do Rule abs (Cnc _ _ (lin : lins)) <- 
+           concatMap snd (aAssocs (leftcornerTokens pinfo)) ++
+           epsilonRules pinfo
+       return $ Active abs [] EmptyRange lin lins (emptyChildren abs)
+
+predictKilburyR :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range
+	       -> AChart c n l -> Item c n l -> [Item c n l]
+predictKilburyR pinfo _ (Passive cat found) = 
+    do Rule abs (Cnc _ _ (Lin l (Cat (_,r,i):syms) : lins)) <- leftcornerCats pinfo ? cat
+       rng <- projection r found
+       children <- unifyRec (emptyChildren abs) i found 
+       return $ Active abs [] rng (Lin l syms) lins children
+predictKilburyR _ _ _ = []
+
+
+----------------------------------------------------------------------
+-- * type definitions
+
+type AChart c n l = ParseChart (Item c n l) (AKey c) 
+
+data Item   c n l = Active (Abstract c n) 
+                           (RangeRec l)  
+			   Range 
+			   (Lin c l Range) 
+			   (LinRec c l Range) 
+			   [RangeRec l]
+		  | Final (Abstract c n) (RangeRec l) [RangeRec l]
+		  | Passive c (RangeRec l)
+		     deriving (Eq, Ord, Show)
+
+data AKey       c = Act c
+		  | Pass c
+		  | Useless
+		  | Fin
+		    deriving (Eq, Ord, Show)
+
+
+keyof :: Item c n l -> AKey c
+keyof (Active _ _ _ (Lin _ (Cat (next, _, _):_)) _ _) = Act next
+keyof (Final _ _ _) = Fin
+keyof (Passive cat _) = Pass cat
+keyof _ = Useless
+
+
+----------------------------------------------------------------------
+-- for tracing purposes
+
+prtSizes chart = "final=" ++ show (length (chartLookup chart Fin)) ++
+		 ", passive=" ++ show (sum [length (chartLookup chart k) | 
+					    k@(Pass _) <- chartKeys chart ]) ++
+		 ", active=" ++ show (sum [length (chartLookup chart k) | 
+					   k@(Act _) <- chartKeys chart ]) ++
+		 ", useless=" ++ show (length (chartLookup chart Useless)) 
+
+prtChart chart = concat [ "\n*** KEY: " ++ prt k ++ 
+			  prtBefore "\n  " (chartLookup chart k) | 
+			  k <- chartKeys chart ] 
+
+prtFinals chart = prtBefore "\n  " (chartLookup chart Fin) 
+
+instance (Print c, Print n, Print l) => Print (Item c n l) where
+    prt (Active abs found rng lin tofind children) = 
+	"? " ++ prt abs ++ ";\n\t" ++ 
+	"{" ++ prtSep " " found ++ "}  " ++ prt rng ++ " . " ++ 
+	prt lin ++ "  {" ++ prtSep " " tofind ++ "}" ++
+        ( if null children then ";" else ";\n\t" ++
+	  "{" ++ prtSep "}  {" (map (prtSep " ") children) ++ "}" )
+    prt (Passive c rrec) = "- " ++ prt c ++ "; {" ++ prtSep " " rrec ++ "}"
+    prt (Final abs rr rrs) = ": " ++ prt abs ++ ";\n\t{" ++ prtSep " " rr ++ "}" ++ 
+			     ( if null rrs then ";" else ";\n\t" ++ 
+			       "{" ++ prtSep "}  {" (map (prtSep " ") rrs) ++ "}" )
+
+instance Print c => Print (AKey c) where
+    prt (Act c) = "Active " ++ prt c
+    prt (Pass c) = "Passive " ++ prt c
+    prt (Fin) = "Final"
+    prt (Useless) = "Useless"
diff --git a/src-3.0/GF/Parsing/MCFG/Active2.hs b/src-3.0/GF/Parsing/MCFG/Active2.hs
new file mode 100644
index 000000000..7ad8627bc
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/Active2.hs
@@ -0,0 +1,237 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.2 $
+--
+-- MCFG parsing, the active algorithm (alternative version)
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.Active2 (parse) where
+
+import GF.Data.GeneralDeduction
+import GF.Data.Assoc
+
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+
+import GF.Parsing.MCFG.Range
+import GF.Parsing.MCFG.PInfo
+
+import GF.System.Tracing
+
+import Control.Monad (guard)
+
+import GF.Infra.Print
+
+----------------------------------------------------------------------
+-- * parsing
+
+--parse :: (Ord n, Ord c, Ord l, Ord t) => String -> MCFParser c n l t
+parse strategy pinfo starts toks =
+    accumAssoc groupSyntaxNodes $
+      [ ((cat, found), SNode fun (zip rhs rrecs)) |
+        Final (Abs cat rhs fun) found rrecs <- chartLookup chart Fin ]
+    where chart = process strategy pinfo starts toks
+
+process :: (Ord n, Ord c, Ord l, Ord t) => 
+	   String -> MCFPInfo c n l t -> [c] -> Input t -> AChart c n l t
+process strategy pinfo starts toks 
+    = tracePrt "MCFG.Active - chart size" prtSizes $
+      buildChart keyof (complete : combine : convert : rules) axioms
+    where rules  | isNil strategy = [scan toks]
+		 | isBU  strategy = [scan toks, predictKilbury pinfo toks]
+		 | isTD  strategy = [scan toks, predictEarley pinfo toks]
+	  axioms | isNil strategy = predict pinfo toks
+		 | isBU  strategy = terminal pinfo toks ++ initialScan pinfo toks
+		 | isTD  strategy = initial pinfo starts toks
+
+isNil s = s=="n"
+isBU  s = s=="b"
+isTD  s = s=="t"
+
+-- used in prediction
+emptyChildren :: Abstract c n -> [RangeRec l]
+emptyChildren (Abs _ rhs _) = replicate (length rhs) []
+
+makeMaxRange (Range (_, j)) = Range (j, j)
+makeMaxRange EmptyRange     = EmptyRange
+
+
+----------------------------------------------------------------------
+-- * inference rules
+
+-- completion
+complete :: (Ord c, Ord n, Ord l, Ord t) => AChart c n l t -> Item c n l t -> [Item c n l t]
+complete _ (Active rule found rng (Lin l []) (lin:lins) recs) = 
+    return $ Active rule (found ++ [(l, rng)]) EmptyRange lin lins recs 
+complete _ _ = []
+
+-- scanning
+--scan :: (Ord c, Ord n, Ord l, Ord t) => AChart c n l t -> Item c n l t -> [Item c n l t]
+scan inp _ (Active rule found rng (Lin l (Tok tok:syms)) lins recs) = 
+    do rng' <- map makeRange (inputToken inp ? tok)
+       rng'' <- concatRange rng rng' 
+       return $ Active rule found rng'' (Lin l syms) lins recs 
+scan _ _ _ = []
+
+-- | Creates an Active Item every time it is possible to combine 
+-- an Active Item from the agenda with a Passive Item from the Chart 
+combine :: (Ord c, Ord n, Ord l, Ord t) => AChart c n l t -> Item c n l t -> [Item c n l t]
+combine chart item@(Active _ _ _ (Lin _ (Cat (c,_,_):_)) _ _) =
+    do Passive _c found <- chartLookup chart (Pass c)
+       combine2 chart found item
+combine chart (Passive c found) = 
+    do item <- chartLookup chart (Act c)
+       combine2 chart found item
+combine _ _ = []      
+
+combine2 chart found' (Active rule found rng (Lin l (Cat (c, r, d):syms)) lins recs) =
+    do rng' <- projection r found'
+       rng'' <- concatRange rng rng'
+       recs' <- unifyRec recs d found'
+       return $ Active rule found rng'' (Lin l syms) lins recs'
+
+-- | Active Items with nothing to find are converted to Final items,
+-- which in turn are converted to Passive Items
+convert :: (Ord c, Ord n, Ord l, Ord t) => AChart c n l t -> Item c n l t -> [Item c n l t]
+convert _ (Active rule found rng (Lin lbl []) [] recs) = 
+    return $ Final rule (found ++ [(lbl,rng)]) recs
+convert _ (Final (Abs cat _ _) found _) = 
+    return $ Passive cat found
+convert _ _ = []
+
+
+----------------------------------------------------------------------
+-- Naive --
+
+predict :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l t]
+predict pinfo toks = tracePrt "MCFG.Active (Naive) - predicted rules" (prt . length) $
+		     do Rule abs (Cnc _ _ (lin:lins)) <- rulesMatchingInput pinfo toks
+			return $ Active abs [] EmptyRange lin lins (emptyChildren abs)
+
+
+----------------------------------------------------------------------
+-- Earley --
+
+-- anropas med alla startkategorier
+initial :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> [c] -> Input t -> [Item c n l t]
+initial pinfo starts toks = 
+    tracePrt "MCFG.Active (Earley) - initial rules" (prt . length) $
+    do cat <- starts
+       Rule abs (Cnc _ _ (lin:lins)) <- topdownRules pinfo ? cat
+       return $ Active abs [] (Range (0, 0)) lin lins (emptyChildren abs)
+
+predictEarley :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t
+	      -> AChart c n l t -> Item c n l t -> [Item c n l t]
+predictEarley pinfo toks _ item@(Active (Abs _ _ f) _ rng (Lin _ (Cat (cat,_,_):_)) _ _) = 
+    topdownRules pinfo ? cat >>= predictEarley2 toks rng 
+predictEarley _ _ _ _ = []
+
+predictEarley2 :: (Ord c, Ord n, Ord l, Ord t) => Input t -> Range -> MCFRule c n l t -> [Item c n l t]
+predictEarley2 toks _ (Rule abs@(Abs _ [] _) (Cnc _ _ lins)) = 
+    do lins' <- rangeRestRec toks lins 
+       return $ Final abs (makeRangeRec lins') []
+predictEarley2 toks rng (Rule abs (Cnc _ _ (lin:lins))) =
+    return $ Active abs [] EmptyRange lin lins (emptyChildren abs)
+
+
+----------------------------------------------------------------------
+-- Kilbury --
+
+terminal :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l t]
+terminal pinfo toks = 
+    tracePrt "MCFG.Active (Kilbury) - initial terminal rules" (prt . length) $
+    do Rule abs (Cnc _ _ lins) <- emptyRules pinfo
+       lins' <- rangeRestRec toks lins 
+       return $ Final abs (makeRangeRec lins') []
+
+initialScan :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l t]
+initialScan pinfo toks =
+    tracePrt "MCFG.Active (Kilbury) - initial scanned rules" (prt . length) $
+    do tok <- aElems (inputToken toks)
+       Rule abs (Cnc _ _ (lin:lins)) <- leftcornerTokens pinfo ? tok
+       return $ Active abs [] EmptyRange lin lins (emptyChildren abs)
+
+predictKilbury :: (Ord c, Ord n, Ord l, Ord t) => MCFPInfo c n l t -> Input t
+	       -> AChart c n l t -> Item c n l t -> [Item c n l t]
+predictKilbury pinfo toks _ (Passive cat found) = 
+    do Rule abs (Cnc _ _ (Lin l (Cat (_,r,i):syms) : lins)) <- leftcornerCats pinfo ? cat
+       rng <- projection r found
+       children <- unifyRec (emptyChildren abs) i found 
+       return $ Active abs [] rng (Lin l syms) lins children
+predictKilbury _ _ _ _ = []
+
+
+----------------------------------------------------------------------
+-- * type definitions
+
+type AChart c n l t = ParseChart (Item c n l t) (AKey c t) 
+
+data Item   c n l t = Active (Abstract c n) 
+                             (RangeRec l)  
+			     Range 
+			     (Lin c l t) 
+			     (LinRec c l t) 
+			     [RangeRec l]
+		    | Final (Abstract c n) (RangeRec l) [RangeRec l]
+		    | Passive c (RangeRec l)
+		      deriving (Eq, Ord, Show)
+
+data AKey       c t = Act c
+		    | ActTok t
+		    | Pass c
+		    | Useless
+		    | Fin
+		      deriving (Eq, Ord, Show)
+
+
+keyof :: Item c n l t -> AKey c t
+keyof (Active _ _ _ (Lin _ (Cat (next, _, _):_)) _ _) = Act next
+keyof (Active _ _ _ (Lin _ (Tok tok:_)) _ _) = ActTok tok
+keyof (Final _ _ _) = Fin
+keyof (Passive cat _) = Pass cat
+keyof _ = Useless
+
+
+----------------------------------------------------------------------
+-- for tracing purposes
+
+prtSizes chart = "final=" ++ show (length (chartLookup chart Fin)) ++
+		 ", passive=" ++ show (sum [length (chartLookup chart k) | 
+					    k@(Pass _) <- chartKeys chart ]) ++
+		 ", active=" ++ show (sum [length (chartLookup chart k) | 
+					   k@(Act _) <- chartKeys chart ]) ++
+		 ", active-tok=" ++ show (sum [length (chartLookup chart k) | 
+					       k@(ActTok _) <- chartKeys chart ]) ++
+		 ", useless=" ++ show (length (chartLookup chart Useless)) 
+
+prtChart chart = concat [ "\n*** KEY: " ++ prt k ++ 
+			  prtBefore "\n  " (chartLookup chart k) | 
+			  k <- chartKeys chart ] 
+
+prtFinals chart = prtBefore "\n  " (chartLookup chart Fin) 
+
+instance (Print c, Print n, Print l, Print t) => Print (Item c n l t) where
+    prt (Active abs found rng lin tofind children) = 
+	"? " ++ prt abs ++ ";\n\t" ++ 
+	"{" ++ prtSep " " found ++ "}  " ++ prt rng ++ " . " ++ 
+	prt lin ++ "  {" ++ prtSep " " tofind ++ "}" ++
+        ( if null children then ";" else ";\n\t" ++
+	  "{" ++ prtSep "}  {" (map (prtSep " ") children) ++ "}" )
+    prt (Passive c rrec) = "- " ++ prt c ++ "; {" ++ prtSep " " rrec ++ "}"
+    prt (Final abs rr rrs) = ": " ++ prt abs ++ ";\n\t{" ++ prtSep " " rr ++ "}" ++ 
+			     ( if null rrs then ";" else ";\n\t" ++ 
+			       "{" ++ prtSep "}  {" (map (prtSep " ") rrs) ++ "}" )
+
+instance (Print c, Print t) => Print (AKey c t) where
+    prt (Act c) = "Active " ++ prt c
+    prt (ActTok t) = "Active-Tok " ++ prt t
+    prt (Pass c) = "Passive " ++ prt c
+    prt (Fin) = "Final"
+    prt (Useless) = "Useless"
diff --git a/src-3.0/GF/Parsing/MCFG/FastActive.hs b/src-3.0/GF/Parsing/MCFG/FastActive.hs
new file mode 100644
index 000000000..0a8e24b55
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/FastActive.hs
@@ -0,0 +1,176 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : Peter Ljunglöf
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- MCFG parsing, the active algorithm, optimized version
+-- structure stolen from Krasimir Angelov's GF.Parsing.FCFG.Active
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.FastActive (parse) where
+
+import GF.Data.GeneralDeduction
+import GF.Data.Assoc
+import GF.Data.Utilities
+
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+
+import GF.Infra.Ident
+
+import GF.Parsing.MCFG.Range
+import GF.Parsing.MCFG.PInfo
+
+import GF.System.Tracing
+
+import Control.Monad (guard)
+
+import GF.Infra.Print
+
+import qualified Data.List as List
+import qualified Data.Map  as Map
+import qualified Data.Set  as Set
+import Data.Array
+
+----------------------------------------------------------------------
+-- * parsing
+
+-- parse :: (Ord c, Ord n, Ord l, Ord t) => String -> MCFParser c n l t
+parse strategy pinfo starts =
+    accumAssoc groupSyntaxNodes $
+      [ ((cat, found), SNode fun (zip rhs rrecs)) |
+        Final (Abs cat rhs fun) found rrecs <- listXChartFinal chart ]
+    where chart = process strategy pinfo axioms emptyXChart
+    
+          -- axioms | isBU  strategy = terminal pinfo toks ++ initialScan pinfo toks
+          axioms | isBU  strategy = initialBU pinfo
+		 | isTD  strategy = initialTD pinfo starts
+
+isBU  s = s=="b"
+isTD  s = s=="t"
+
+-- used in prediction
+emptyChildren :: Abstract c n -> [RangeRec l]
+emptyChildren (Abs _ rhs _) = replicate (length rhs) []
+
+updateChildren :: Eq l => [RangeRec l] -> Int -> RangeRec l -> [[RangeRec l]]
+updateChildren recs i rec = updateNthM update i recs
+    where update rec' = do guard (null rec' || rec' == rec)
+                           return rec
+
+process :: (Ord c, Ord n, Ord l) => String -> MCFPInfo c n l Range -> [Item c n l] -> XChart c n l -> XChart c n l
+process strategy pinfo []           chart = chart
+process strategy pinfo (item:items) chart = process strategy pinfo items $! univRule item chart
+  where
+    univRule item@(Active abs found rng (Lin l syms) lins recs) chart 
+        = case syms of
+            Cat(c,r,d) : syms' -> 
+                case insertXChart chart item c of
+	          Nothing    -> chart
+	          Just chart -> 
+                      let items = -- predict topdown
+                                  [ Active abs [] EmptyRange lin lins (emptyChildren abs) |
+	     			    isTD strategy,
+	     			    Rule abs (Cnc _ _ (lin:lins)) <- topdownRules pinfo ? c ] ++
+
+                                  -- combine
+                                  [ Active abs found rng'' (Lin l syms') lins recs' |
+                                    Final _ found' _ <- lookupXChartFinal chart c,
+                                    rng'  <- projection r found',
+	         	            rng'' <- concatRange rng rng',
+	         	            recs' <- updateChildren recs d found' ]
+	     	      in process strategy pinfo items chart
+
+            -- scan
+	    Tok rng' : syms' -> 
+                let items = [ Active abs found rng'' (Lin l syms') lins recs |
+                              rng'' <- concatRange rng rng' ]
+                in process strategy pinfo items chart
+
+            -- complete
+            [] -> case lins of
+                    (lin':lins') -> univRule (Active abs ((l,rng):found) EmptyRange lin' lins' recs) chart
+                    []           -> univRule (Final  abs (reverse ((l,rng):found))             recs) chart 
+
+    univRule item@(Final abs@(Abs cat _ _) found' recs) chart =
+      case insertXChart chart item cat of
+        Nothing    -> chart
+        Just chart -> 
+            let items = -- predict bottomup
+    			[ Active abs [] rng (Lin l syms') lins children |
+                          isBU strategy,
+			  Rule abs (Cnc _ _ (Lin l (Cat(c,r,d):syms') : lins)) <- leftcornerCats pinfo ? cat,
+                          -- lin' : lins' <- rangeRestRec toks (Lin l syms' : lins),
+                          rng <- projection r found',
+                          children <- unifyRec (emptyChildren abs) d found' ] ++
+
+                        -- combine
+                        [ Active abs found rng'' (Lin l syms') lins recs' |
+                          Active abs found rng (Lin l (Cat(c,r,d):syms')) lins recs <- lookupXChartAct chart cat,
+                          rng'  <- projection r found',
+                          rng'' <- concatRange rng rng',
+                          recs' <- updateChildren recs d found' ] 
+            in process strategy pinfo items chart
+
+----------------------------------------------------------------------
+-- * XChart
+
+data XChart c n l = XChart !(AChart c n l) !(AChart c n l)
+type AChart c n l = ParseChart (Item c n l) c
+
+data Item   c n l = Active (Abstract c n) 
+                           (RangeRec l)  
+			   Range 
+			   (Lin c l Range) 
+			   (LinRec c l Range) 
+			   [RangeRec l]
+		  | Final (Abstract c n) (RangeRec l) [RangeRec l]
+-- 		  | Passive c (RangeRec l)
+		     deriving (Eq, Ord, Show)
+
+emptyXChart :: (Ord c, Ord n, Ord l) => XChart c n l
+emptyXChart = XChart emptyChart emptyChart
+
+insertXChart (XChart actives finals) item@(Active _ _ _ _ _ _) c = 
+  case chartInsert actives item c of
+    Nothing      -> Nothing
+    Just actives -> Just (XChart actives finals)
+
+insertXChart (XChart actives finals) item@(Final _ _ _)       c =
+  case chartInsert finals item c of
+    Nothing     -> Nothing
+    Just finals -> Just (XChart actives finals)
+
+lookupXChartAct   (XChart actives finals) c = chartLookup actives c
+lookupXChartFinal (XChart actives finals) c = chartLookup finals  c
+
+listXChartAct   (XChart actives finals) = chartList actives
+listXChartFinal (XChart actives finals) = chartList finals
+
+
+----------------------------------------------------------------------
+-- Earley --
+
+-- called with all starting categories
+initialTD :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range -> [c] -> [Item c n l]
+initialTD pinfo starts = 
+    [ Active abs [] (Range (0, 0)) lin' lins' (emptyChildren abs) |
+      cat <- starts,
+      Rule abs (Cnc _ _ (lin':lins')) <- topdownRules pinfo ? cat ]
+       -- lin' : lins' <- rangeRestRec toks lins
+
+
+----------------------------------------------------------------------
+-- Kilbury --
+
+initialBU :: (Ord c, Ord n, Ord l) => MCFPInfo c n l Range -> [Item c n l]
+initialBU pinfo =
+    [ Active abs [] EmptyRange lin' lins' (emptyChildren abs) |
+      -- do tok <- aElems (inputToken toks)
+      Rule abs (Cnc _ _ (lin':lins')) <- 
+          concatMap snd (aAssocs (leftcornerTokens pinfo)) ++
+          -- leftcornerTokens pinfo ? tok ++
+          epsilonRules pinfo ]
+       -- lin' : lins' <- rangeRestRec toks lins
diff --git a/src-3.0/GF/Parsing/MCFG/Incremental.hs b/src-3.0/GF/Parsing/MCFG/Incremental.hs
new file mode 100644
index 000000000..bd5b4114d
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/Incremental.hs
@@ -0,0 +1,178 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.4 $
+--
+-- MCFG parsing, the incremental algorithm
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.Incremental (parse, parseR) where
+
+import Data.List
+import Control.Monad (guard) 
+
+import GF.Data.Utilities (select)
+import GF.Data.GeneralDeduction
+import GF.Data.Assoc
+
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+
+import GF.Parsing.MCFG.Range
+import GF.Parsing.MCFG.PInfo
+
+import GF.System.Tracing
+import GF.Infra.Print
+
+----------------------------------------------------------------------
+-- parsing
+
+parse :: (Ord n, Ord c, Ord l, Ord t) => MCFParser c n l t
+parse pinfo starts toks =
+    accumAssoc groupSyntaxNodes $
+      [ ((cat, found), SNode fun (zip rhs rrecs)) |
+        Final (Abs cat rhs fun) found rrecs <- chartLookup chart Fin ]
+    where chart = process pinfo toks ntoks
+	  ntoks = snd (inputBounds toks)
+
+-- parseR :: (Ord n, Ord c, Ord l, Ord t) => MCFParser c n l t
+parseR pinfo starts ntoks =
+    accumAssoc groupSyntaxNodes $
+    [ ((cat, found), SNode fun (zip rhs rrecs)) |
+      Final (Abs cat rhs fun) found rrecs <- chartLookup chart Fin ]
+    where chart = processR pinfo ntoks 
+
+process :: (Ord n, Ord c, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> Int -> IChart c n l
+process pinfo toks ntoks
+    = tracePrt "MCFG.Incremental - chart size" prtSizes $
+      buildChart keyof [complete ntoks, scan, combine, convert] (predict pinfo toks ntoks)
+
+processR :: (Ord n, Ord c, Ord l) => MCFPInfo c n l Range -> Int -> IChart c n l
+processR pinfo ntoks
+    = tracePrt "MCFG.Incremental Range - chart size" prtSizes $
+      buildChart keyof [complete ntoks, scan, combine, convert] (predictR pinfo ntoks)
+
+complete ::  (Ord n, Ord c, Ord l) => Int -> IChart c n l -> Item c n l -> [Item c n l]
+complete ntoks _ (Active rule found rng (Lin l []) lins recs) = 
+    do (lin, lins') <- select lins
+       k <- [minRange rng .. ntoks]
+       return $ Active rule (found ++ [(l, rng)]) (Range (k,k)) lin lins' recs 
+complete _ _ _ = []
+
+
+predict :: (Ord n, Ord c, Ord l, Ord t) => MCFPInfo c n l t -> Input t -> Int -> [Item c n l]
+predict pinfo toks n = 
+    tracePrt "MCFG.Incremental - predicted rules" (prt . length) $
+    do Rule abs@(Abs _ rhs _) (Cnc _ _ lins) <- rulesMatchingInput pinfo toks
+       let daughters = replicate (length rhs) []
+       lins' <- rangeRestRec toks lins
+       (lin', lins'') <- select lins'
+       k <- [0..n] 
+       return $ Active abs [] (Range (k,k)) lin' lins'' daughters 
+
+
+predictR :: (Ord n, Ord c, Ord l) => MCFPInfo c n l Range -> Int -> [Item c n l]
+predictR pinfo n = 
+    tracePrt "MCFG.Incremental Range - predicted rules" (prt . length) $
+    do Rule abs@(Abs _ rhs _) (Cnc _ _ lins) <- allRules pinfo 
+       let daughters = replicate (length rhs) []
+       (lin, lins') <- select lins
+       k <- [0..n] 
+       return $ Active abs [] (Range (k,k)) lin lins' daughters 
+
+
+scan :: (Ord n, Ord c, Ord l) => IChart c n l -> Item c n l -> [Item c n l]
+scan _ (Active abs found rng (Lin l (Tok rng':syms)) lins recs) = 
+    do rng'' <- concatRange rng rng' 
+       return $ Active abs found rng'' (Lin l syms) lins recs 
+scan _ _ = []
+
+
+combine :: (Ord n, Ord c, Ord l) => IChart c n l -> Item c n l -> [Item c n l]
+combine chart active@(Active _ _ rng (Lin _ (Cat (c,l,_):_)) _ _) = 
+    do passive <- chartLookup chart (Pass c l (maxRange rng))
+       combine2 active passive
+combine chart passive@(Active (Abs c _ _) _ rng (Lin l []) _ _) = 
+    do active <- chartLookup chart (Act c l (minRange rng))
+       combine2 active passive
+combine _ _ = [] 
+
+combine2 (Active abs found rng (Lin l (Cat (c,l',d):syms)) lins recs) 
+	     (Active _ found' rng' _ _ _)
+    = do rng'' <- concatRange rng rng' 
+	 recs' <- unifyRec recs d found''
+	 return $ Active abs found rng'' (Lin l syms) lins recs'
+    where found'' = found' ++ [(l',rng')]
+
+
+convert _ (Active rule found rng (Lin lbl []) [] recs) = 
+    return $ Final rule (found ++ [(lbl,rng)]) recs
+convert _ _ = []
+
+----------------------------------------------------------------------
+-- type definitions
+
+type IChart c n l = ParseChart (Item c n l) (IKey c l) 
+
+data Item   c n l = Active (Abstract c n) 
+                           (RangeRec l) 
+			   Range 
+			   (Lin c l Range) 
+			   (LinRec c l Range) 
+			   [RangeRec l]
+		  | Final (Abstract c n) (RangeRec l) [RangeRec l]
+--		  | Passive c (RangeRec l) 
+		    deriving (Eq, Ord, Show)
+
+data IKey     c l = Act c l Int
+                  | Pass c l Int
+		  | Useless
+		  | Fin
+		    deriving (Eq, Ord, Show)
+
+keyof :: Item c n l -> IKey c l
+keyof (Active _ _ rng (Lin _ (Cat (next,lbl,_):_)) _ _) 
+    = Act next lbl (maxRange rng)
+keyof (Active (Abs cat _ _) found rng (Lin lbl []) _ _) 
+    = Pass cat lbl (minRange rng)
+keyof (Final _ _ _) = Fin
+keyof _                                                       
+    = Useless
+
+
+----------------------------------------------------------------------
+-- for tracing purposes
+prtSizes chart = "final=" ++ show (length (chartLookup chart Fin)) ++
+		 ", passive=" ++ show (sum [length (chartLookup chart k) | 
+					    k@(Pass _ _ _) <- chartKeys chart ]) ++
+		 ", active=" ++ show (sum [length (chartLookup chart k) | 
+					   k@(Act _ _ _) <- chartKeys chart ]) ++
+		 ", useless=" ++ show (length (chartLookup chart Useless)) 
+
+prtChart chart = concat [ "\n*** KEY: " ++ prt k ++ 
+			  prtBefore "\n  " (chartLookup chart k) | 
+			  k <- chartKeys chart ] 
+
+instance (Print c, Print n, Print l) => Print (Item c n l) where
+    prt (Active abs found rng lin tofind children) = 
+	"? " ++ prt abs ++ ";\n\t" ++ 
+	"{" ++ prtSep " " found ++ "} " ++ prt rng ++ " . " ++ 
+	prt lin ++ "{" ++ prtSep " " tofind ++ "}" ++
+        ( if null children then ";" else ";\n\t" ++
+	  "{" ++ prtSep "} {" (map (prtSep " ") children) ++ "}" )
+--    prt (Passive c rrec) = "- " ++ prt c ++ "; {" ++ prtSep " " rrec ++ "}"
+    prt (Final abs rr rrs) = ": " ++ prt abs ++ ";\n\t{" ++ prtSep " " rr ++ "}" ++ 
+			     ( if null rrs then ";" else ";\n\t" ++ 
+			       "{" ++ prtSep "} {" (map (prtSep " ") rrs) ++ "}" )
+
+instance (Print c, Print l) => Print (IKey c l) where
+    prt (Act c l i) = "Active " ++ prt c ++ " " ++ prt l ++ " @ " ++ prt i
+    prt (Pass c l i) = "Passive " ++ prt c ++ " " ++ prt l ++ " @ " ++ prt i
+    prt (Fin) = "Final"
+    prt (Useless) = "Useless"
diff --git a/src-3.0/GF/Parsing/MCFG/Incremental2.hs b/src-3.0/GF/Parsing/MCFG/Incremental2.hs
new file mode 100644
index 000000000..db6c3084e
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/Incremental2.hs
@@ -0,0 +1,157 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.3 $
+--
+-- MCFG parsing, the incremental algorithm (alternative version)
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.Incremental2 (parse) where
+
+import Data.List
+import Data.Array
+import Control.Monad (guard) 
+
+import GF.Data.Utilities (select)
+import GF.Data.Assoc 
+import GF.Data.IncrementalDeduction
+
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+
+import GF.Parsing.MCFG.Range
+import GF.Parsing.MCFG.PInfo
+
+import GF.System.Tracing
+import GF.Infra.Print
+
+----------------------------------------------------------------------
+-- parsing
+
+-- parseR :: (Ord n, Ord c, Ord l, Ord t) => MCFParser c n l t
+parse pinfo starts inp =
+    accumAssoc groupSyntaxNodes $
+      [ ((cat, found), SNode fun (zip rhs rrecs)) |
+        k <- uncurry enumFromTo (inputBounds inp),
+        Final (Abs cat rhs fun) found rrecs <- chartLookup chart k Fin ]
+    where chart = process pinfo inp 
+
+--process :: (Ord n, Ord c, Ord l) => MCFPInfo c n l Range -> (Int, Int) -> IChart c n l
+process pinfo inp
+    = tracePrt "MCFG.Incremental - chart size" 
+          (prt . map (prtSizes finalChart . fst) . assocs) $ 
+      finalChart
+    where finalChart    = buildChart keyof rules axioms inBounds
+	  axioms k      = tracePrt ("MCFG.Incremental - axioms for " ++ show k) (prt . length) $
+			  predict k ++ scan k ++ complete1 k 
+	  rules  k item = complete2 k item ++ combine k item ++ convert k item
+	  inBounds      = inputBounds inp
+
+          -- axioms: predict + scan + complete
+	  predict k = do Rule abs@(Abs _ rhs _) (Cnc _ _ lins) <- rulesMatchingInput pinfo inp
+			 let daughters = replicate (length rhs) []
+			 (lin, lins') <- select lins
+			 return $ Active abs [] k lin lins' daughters 
+
+	  scan k = do (tok, js) <- aAssocs (inputTo inp ! k)
+		      j <- js
+		      Active abs found i (Lin l (Tok _tok:syms)) lins recs <- 
+			  chartLookup finalChart j (ActTok tok)
+		      return $ Active abs found i  (Lin l syms) lins recs 
+
+	  complete1 k = do j <- [fst inBounds .. k-1]
+			   Active abs found i (Lin l _Nil) lins recs <- 
+			       chartLookup finalChart j Pass
+			   let found' = found ++ [(l, makeRange (i,j))]
+			   (lin, lins') <- select lins
+			   return $ Active abs found' k lin lins' recs 
+
+          -- rules: convert + combine + complete
+	  convert k (Active rule found j (Lin lbl []) [] recs) = 
+	      let found' = found ++ [(lbl, makeRange (j,k))]
+	       in return $ Final rule found' recs
+	  convert _ _ = []
+
+	  combine k (Active (Abs cat _ _) found' j (Lin lbl []) _ _) = 
+	      do guard (j < k) ---- cannot handle epsilon-rules
+		 Active abs found i (Lin l (Cat (_cat,_lbl,nr):syms)) lins recs <- 
+		     chartLookup finalChart j (Act cat lbl)
+		 let found'' = found' ++ [(lbl, makeRange (j,k))]
+		 recs' <- unifyRec recs nr found''
+		 return $ Active abs found i (Lin l syms) lins recs'
+	  combine _ _ = []
+
+	  complete2 k (Active abs found i (Lin l []) lins recs) =
+	      do let found' = found ++ [(l, makeRange (i,k))]
+		 (lin, lins') <- select lins
+		 return $ Active abs found' k lin lins' recs 
+	  complete2 _ _ = []
+
+----------------------------------------------------------------------
+-- type definitions
+
+type IChart c n l t = IncrementalChart (Item c n l t) (IKey c l t) 
+
+data Item   c n l t = Active (Abstract c n) 
+                             (RangeRec l) 
+			     Int 
+			     (Lin c l t) 
+			     (LinRec c l t) 
+			     [RangeRec l]
+		    | Final (Abstract c n) (RangeRec l) [RangeRec l]
+		    ---- | Passive c (RangeRec l) 
+		      deriving (Eq, Ord, Show)
+
+data IKey     c l t = Act c l 
+		    | ActTok t
+		    ---- | Useless
+		    | Pass
+		    | Fin
+		      deriving (Eq, Ord, Show)
+
+keyof :: Item c n l t -> IKey c l t
+keyof (Active _ _ _ (Lin _ (Cat (next,lbl,_):_)) _ _) = Act next lbl 
+keyof (Active _ _ _ (Lin _ (Tok tok:_)) _ _) = ActTok tok 
+keyof (Active _ _ _ (Lin _ []) _ _) = Pass
+keyof (Final _ _ _) = Fin
+-- keyof _ = Useless
+
+
+----------------------------------------------------------------------
+-- for tracing purposes
+prtSizes chart k = "f=" ++ show (length (chartLookup chart k Fin)) ++
+		   " p=" ++ show (length (chartLookup chart k Pass)) ++ 
+		   " a=" ++ show (sum [length (chartLookup chart k key) | 
+					     key@(Act _ _) <- chartKeys chart k ]) ++
+		   " t=" ++ show (sum [length (chartLookup chart k key) | 
+						 key@(ActTok _) <- chartKeys chart k ]) 
+		   -- " u=" ++ show (length (chartLookup chart k Useless)) 
+
+-- prtChart chart = concat [ "\n*** KEY: " ++ prt k ++ 
+-- 			  prtBefore "\n  " (chartLookup chart k) | 
+-- 			  k <- chartKeys chart ] 
+
+instance (Print c, Print n, Print l, Print t) => Print (Item c n l t) where
+    prt (Active abs found rng lin tofind children) = 
+	"? " ++ prt abs ++ ";\n\t" ++ 
+	"{" ++ prtSep " " found ++ "} " ++ prt rng ++ " . " ++ 
+	prt lin ++ "{" ++ prtSep " " tofind ++ "}" ++
+        ( if null children then ";" else ";\n\t" ++
+	  "{" ++ prtSep "} {" (map (prtSep " ") children) ++ "}" )
+    -- prt (Passive c rrec) = "- " ++ prt c ++ "; {" ++ prtSep " " rrec ++ "}"
+    prt (Final abs rr rrs) = ": " ++ prt abs ++ ";\n\t{" ++ prtSep " " rr ++ "}" ++ 
+			     ( if null rrs then ";" else ";\n\t" ++ 
+			       "{" ++ prtSep "} {" (map (prtSep " ") rrs) ++ "}" )
+
+instance (Print c, Print l, Print t) => Print (IKey c l t) where
+    prt (Act c l) = "Active " ++ prt c ++ " " ++ prt l
+    prt (ActTok t) = "ActiveTok " ++ prt t
+    -- prt (Pass c l i) = "Passive " ++ prt c ++ " " ++ prt l ++ " @ " ++ prt i
+    prt (Fin) = "Final"
+    -- prt (Useless) = "Useless"
diff --git a/src-3.0/GF/Parsing/MCFG/Naive.hs b/src-3.0/GF/Parsing/MCFG/Naive.hs
new file mode 100644
index 000000000..7d1fa0a8a
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/Naive.hs
@@ -0,0 +1,142 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.5 $
+--
+-- MCFG parsing, the naive algorithm
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.Naive (parse, parseR) where
+
+import Control.Monad (guard)
+
+-- GF modules
+import GF.Data.GeneralDeduction
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+import GF.Parsing.MCFG.Range
+import GF.Parsing.MCFG.PInfo
+import GF.Data.SortedList
+import GF.Data.Assoc
+import GF.System.Tracing
+
+import GF.Infra.Print
+
+----------------------------------------------------------------------
+-- * parsing
+
+-- | Builds a chart from the initial agenda, given by prediction, and the inference rules 
+parse :: (Ord t, Ord n, Ord c, Ord l) => MCFParser c n l t
+parse pinfo starts toks
+    = accumAssoc groupSyntaxNodes $
+        [ ((cat, makeRangeRec lins), SNode fun (zip rhs rrecs)) |
+          Active (Abs cat _Nil fun, rhs) lins rrecs <- chartLookup chart Final ]
+    where chart = process pinfo toks
+
+-- | Builds a chart from the initial agenda, given by prediction, and the inference rules 
+-- parseR :: (Ord t, Ord n, Ord c, Ord l) => MCFParser c n l t
+parseR pinfo starts
+    = accumAssoc groupSyntaxNodes $
+        [ ((cat, makeRangeRec lins), SNode fun (zip rhs rrecs)) |
+	  Active (Abs cat _Nil fun, rhs) lins rrecs <- chartLookup chart Final ]
+    where chart = processR pinfo
+
+process :: (Ord t, Ord n, Ord c, Ord l) => MCFPInfo c n l t -> Input t -> NChart c n l
+process pinfo toks
+    = tracePrt "MCFG.Naive - chart size" prtSizes $
+      buildChart keyof [convert, combine] (predict pinfo toks)
+
+processR :: (Ord n, Ord c, Ord l) => MCFPInfo c n l Range -> NChart c n l
+processR pinfo
+    = tracePrt "MCFG.Naive Range - chart size" prtSizes $
+      buildChart keyof [convert, combine] (predictR pinfo)
+
+
+----------------------------------------------------------------------
+-- * inference rules
+
+-- Creates an Active Item of every Rule in the Grammar to give the initial Agenda
+predict :: (Ord l, Ord t) => MCFPInfo c n l t -> Input t -> [Item c n l]  
+predict pinfo toks = tracePrt "MCFG.Naive - predicted rules" (prt . length) $
+		     do Rule abs (Cnc _ _ lins) <- rulesMatchingInput pinfo toks
+			lins' <- rangeRestRec toks lins
+			return $ Active (abs, []) lins' [] 
+
+-- Creates an Active Item of every Rule in the Grammar to give the initial Agenda
+predictR :: (Ord l) => MCFPInfo c n l Range -> [Item c n l]  
+predictR pinfo = tracePrt "MCFG.Naive Range - predicted rules" (prt . length) $
+		 do Rule abs (Cnc _ _ lins) <- allRules pinfo 
+		    return $ Active (abs, []) lins [] 
+
+-- | Creates an Active Item every time it is possible to combine 
+-- an Active Item from the agenda with a Passive Item from the Chart 
+combine :: (Ord n, Ord c, Ord l) => NChart c n l -> Item c n l -> [Item c n l]
+combine chart item@(Active (Abs _ (c:_) _, _) _ _) = 
+    do Passive _c rrec <- chartLookup chart (Pass c)
+       combine2 chart rrec item
+combine chart (Passive c rrec) = 
+    do item <- chartLookup chart (Act c)
+       combine2 chart rrec item
+combine _ _ = []
+
+combine2 chart rrec (Active (Abs nt (c:find) f, found) lins rrecs) = 
+    do lins' <- substArgRec (length found) rrec lins
+       return $ Active (Abs nt find f, found ++ [c]) lins' (rrecs ++ [rrec])
+
+-- | Active Items with nothing to find are converted to Passive Items
+convert :: (Ord n, Ord c, Ord l) => NChart c n l -> Item c n l -> [Item c n l]
+convert _ (Active (Abs cat [] fun, _) lins _) = [Passive cat (makeRangeRec lins)]
+convert _ _                                   = []
+
+
+----------------------------------------------------------------------
+-- * type definitions
+
+type NChart   c n l = ParseChart (Item c n l) (NKey c)
+
+data Item     c n l = Active (DottedRule c n) (LinRec c l Range) [RangeRec l]
+	            | Passive c (RangeRec l)
+	              deriving (Eq, Ord, Show)      
+
+type DottedRule c n = (Abstract c n, [c])
+
+data NKey         c = Act c
+	            | Pass c
+	            | Final
+	              deriving (Eq, Ord, Show)
+
+keyof :: Item c n l -> NKey c
+keyof (Active (Abs _ (next:_) _, _) _ _) = Act next 
+keyof (Passive cat _)                    = Pass cat
+keyof _                                  = Final
+
+-- for tracing purposes
+prtSizes chart = "final=" ++ show (length (chartLookup chart Final)) ++
+		 ", passive=" ++ show (sum [length (chartLookup chart k) | 
+					    k@(Pass _) <- chartKeys chart ]) ++
+		 ", active=" ++ show (sum [length (chartLookup chart k) | 
+					   k@(Act _) <- chartKeys chart ]) 
+
+prtChart chart = concat [ "\n*** KEY: " ++ prt k ++ 
+			  prtBefore "\n  " (chartLookup chart k) | 
+			  k <- chartKeys chart ] 
+
+instance (Print c, Print n, Print l) => Print (Item c n l) where
+    prt (Active (abs, cs) lrec rrecs) = "? " ++ prt abs ++ " . " ++ prtSep " " cs ++ ";\n\t" ++
+					"{" ++ prtSep " " lrec ++ "}" ++ 
+					( if null rrecs then ";" else ";\n\t" ++
+					  "{" ++ prtSep "} {" (map (prtSep " ") rrecs) ++ "}" )
+    prt (Passive c rrec) = "- " ++ prt c ++ "; {" ++ prtSep " " rrec ++ "}"
+
+instance Print c => Print (NKey c) where
+    prt (Act c) = "Active " ++ prt c
+    prt (Pass c) = "Passive " ++ prt c
+    prt (Final) = "Final"
+
+
diff --git a/src-3.0/GF/Parsing/MCFG/PInfo.hs b/src-3.0/GF/Parsing/MCFG/PInfo.hs
new file mode 100644
index 000000000..56119dcec
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/PInfo.hs
@@ -0,0 +1,162 @@
+---------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/05/13 12:40:19 $ 
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.5 $
+--
+-- MCFG parsing, parser information
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.PInfo where
+
+import GF.System.Tracing
+import GF.Infra.Print
+
+import GF.Formalism.Utilities
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Data.SortedList
+import GF.Data.Assoc
+import GF.Parsing.MCFG.Range
+
+----------------------------------------------------------------------
+-- type declarations
+
+-- | the list of categories = possible starting categories
+type MCFParser c n l t = MCFPInfo c n l t 
+		       -> [c]
+		       -> Input t
+		       -> SyntaxChart n (c, RangeRec l)
+
+makeFinalEdge :: c -> l -> (Int, Int) -> (c, RangeRec l)
+makeFinalEdge cat lbl bnds = (cat, [(lbl, makeRange bnds)])
+
+
+------------------------------------------------------------
+-- parser information
+
+data MCFPInfo c n l t
+    = MCFPInfo { grammarTokens :: SList t
+	       , nameRules     :: Assoc n (SList (MCFRule c n l t))
+	       , topdownRules  :: Assoc c (SList (MCFRule c n l t))
+		 -- ^ used in 'GF.Parsing.MCFG.Active' (Earley):
+	       , epsilonRules    :: [MCFRule c n l t]
+		 -- ^ used in 'GF.Parsing.MCFG.Active' (Kilbury):
+	       , leftcornerCats :: Assoc c (SList (MCFRule c n l t))
+	       , leftcornerTokens :: Assoc t (SList (MCFRule c n l t))
+		 -- ^ used in 'GF.Parsing.MCFG.Active' (Kilbury):
+	       , grammarCats   :: SList c
+		 -- ^ used when calculating starting categories
+	       , rulesByToken  :: Assoc t (SList (MCFRule c n l t, SList t))
+	       , rulesWithoutTokens :: SList (MCFRule c n l t)
+		 -- ^ used by 'rulesMatchingInput' 
+	       , allRules :: MCFGrammar c n l t
+		 -- ^ used by any unoptimized algorithm
+
+		 --bottomupRules        :: Assoc (Symbol c t) (SList (CFRule c n t)),
+		 --emptyLeftcornerRules :: Assoc c            (SList (CFRule c n t)),
+		 --emptyCategories      :: Set c,
+	       }
+
+
+rangeRestrictPInfo :: (Ord c, Ord n, Ord l, Ord t) => 
+		      MCFPInfo c n l t -> Input t -> MCFPInfo c n l Range
+rangeRestrictPInfo (pinfo{-::MCFPInfo c n l t-}) inp =
+    tracePrt "MCFG.PInfo - Restricting the parser information" (prt . grammarTokens)
+    MCFPInfo { grammarTokens = nubsort (map edgeRange (inputEdges inp))
+	     , nameRules = rrAssoc (nameRules pinfo)
+	     , topdownRules = rrAssoc (topdownRules pinfo)
+	     , epsilonRules = rrRules (epsilonRules pinfo)
+	     , leftcornerCats = rrAssoc (leftcornerCats pinfo)
+	     , leftcornerTokens = lctokens
+	     , grammarCats = grammarCats pinfo
+	     , rulesByToken = emptyAssoc -- error "MCFG.PInfo.rulesByToken - no range restriction"
+	     , rulesWithoutTokens = [] -- error "MCFG.PInfo.rulesByToken - no range restriction"
+	     , allRules = allrules -- rrRules (allRules pinfo)
+	     }
+
+    where lctokens = accumAssoc id 
+		     [ (rng, rule) | (tok, rules) <- aAssocs (leftcornerTokens pinfo),
+		       inputToken inp ?= tok,
+		       rule@(Rule _ (Cnc _ _ (Lin _ (Tok rng:_) : _))) 
+		           <- concatMap (rangeRestrictRule inp) rules ]
+
+          allrules = rrRules $ rulesMatchingInput pinfo inp
+
+	  rrAssoc assoc = filterNull $ fmap rrRules assoc
+	  filterNull assoc = assocFilter (not . null) assoc
+	  rrRules rules = concatMap (rangeRestrictRule inp) rules
+
+
+buildMCFPInfo :: (Ord c, Ord n, Ord l, Ord t) => MCFGrammar c n l t -> MCFPInfo c n l t
+buildMCFPInfo grammar = 
+    traceCalcFirst grammar $
+    tracePrt "MCFG.PInfo - parser info" (prt) $
+    MCFPInfo { grammarTokens = grammartokens
+	     , nameRules = namerules
+	     , topdownRules = topdownrules
+	     , epsilonRules = epsilonrules
+	     , leftcornerCats = leftcorncats
+	     , leftcornerTokens = leftcorntoks
+	     , grammarCats = grammarcats
+	     , rulesByToken = rulesbytoken
+	     , rulesWithoutTokens = ruleswithouttokens
+	     , allRules = allrules
+	     }
+
+    where allrules      = concatMap expandVariants grammar
+	  grammartokens = union (map fst ruletokens)
+	  namerules     = accumAssoc id 
+			  [ (name, rule) | rule@(Rule (Abs _ _ name) _) <- allrules ]
+	  topdownrules  = accumAssoc id
+			  [ (cat, rule) | rule@(Rule (Abs cat _ _) _) <- allrules ]
+	  epsilonrules    = [ rule | rule@(Rule _ (Cnc _ _ (Lin _ [] : _))) <- allrules ]
+	  leftcorncats  = accumAssoc id 
+			  [ (cat, rule) | 
+			    rule@(Rule _ (Cnc _ _ (Lin _ (Cat(cat,_,_):_) : _))) <- allrules ]
+	  leftcorntoks  = accumAssoc id 
+			  [ (tok, rule) | 
+			    rule@(Rule _ (Cnc _ _ (Lin _ (Tok tok:_) : _))) <- allrules ]
+	  grammarcats   = aElems topdownrules
+	  ruletokens    = [ (toksoflins lins, rule) | 
+			    rule@(Rule _ (Cnc _ _ lins)) <- allrules ]
+	  toksoflins lins = nubsort [ tok | Lin _ syms <- lins, Tok tok <- syms ]
+	  rulesbytoken  = accumAssoc id 
+			  [ (tok, (rule, toks)) | (tok:toks, rule) <- ruletokens ]
+	  ruleswithouttokens = nubsort [ rule | ([], rule) <- ruletokens ]
+
+
+-- | return only the rules for which all tokens are in the input string
+rulesMatchingInput :: Ord t => MCFPInfo c n l t -> Input t -> [MCFRule c n l t]
+rulesMatchingInput pinfo inp =
+    [ rule | tok <- toks,
+      (rule, ruletoks) <- rulesByToken pinfo ? tok,
+      ruletoks `subset` toks ]
+    ++ rulesWithoutTokens pinfo
+    where toks = aElems (inputToken inp)
+
+
+----------------------------------------------------------------------
+-- pretty-printing of statistics
+
+instance (Ord c, Ord n, Ord l, Ord t) => Print (MCFPInfo c n l t) where
+    prt pI = "[ tokens=" ++ sl grammarTokens ++
+	     "; categories=" ++ sl grammarCats ++ 
+	     "; nameRules=" ++ sla nameRules ++ 
+	     "; tdRules=" ++ sla topdownRules ++
+	     "; epsilonRules=" ++ sl epsilonRules ++ 
+	     "; lcCats=" ++ sla leftcornerCats ++
+	     "; lcTokens=" ++ sla leftcornerTokens ++
+	     "; byToken=" ++ sla rulesByToken ++
+	     "; noTokens=" ++ sl rulesWithoutTokens ++
+	     "; allRules=" ++ sl allRules ++
+	     " ]"
+
+	where sl  f = show $ length $ f pI
+	      sla f = let (as, bs) = unzip $ aAssocs $ f pI
+		       in show (length as) ++ "/" ++ show (length (concat bs))
+
diff --git a/src-3.0/GF/Parsing/MCFG/Range.hs b/src-3.0/GF/Parsing/MCFG/Range.hs
new file mode 100644
index 000000000..91671fa00
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/Range.hs
@@ -0,0 +1,206 @@
+---------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $ 
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.5 $
+--
+-- Definitions of ranges, and operations on ranges
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.Range
+    ( Range(..), makeRange, concatRange, rangeEdge, edgeRange, minRange, maxRange,
+      LinRec, RangeRec,
+      makeRangeRec, rangeRestRec, rangeRestrictRule, 
+      projection, unifyRec, substArgRec
+    ) where
+
+
+-- Haskell
+import Data.List
+import Control.Monad
+
+-- GF modules
+import GF.Formalism.GCFG
+import GF.Formalism.MCFG
+import GF.Formalism.Utilities
+import GF.Infra.Print
+import GF.Data.Assoc ((?))
+import GF.Data.Utilities (updateNthM)
+
+------------------------------------------------------------
+-- ranges as single pairs
+
+data Range = Range (Int, Int)
+	   | EmptyRange
+             deriving (Eq, Ord, Show)
+
+makeRange   :: (Int, Int) -> Range
+concatRange :: Range -> Range -> [Range]
+rangeEdge   :: a -> Range -> Edge a
+edgeRange   :: Edge a -> Range
+minRange    :: Range -> Int
+maxRange    :: Range -> Int
+
+makeRange                              = Range 
+concatRange EmptyRange rng = return rng
+concatRange rng EmptyRange = return rng
+concatRange (Range(i,j)) (Range(j',k)) = [ Range(i,k) | j==j']
+rangeEdge    a           (Range(i,j))  = Edge i j a
+edgeRange   (Edge i j _)               = Range (i,j)
+minRange    (Range rho)                = fst rho
+maxRange    (Range rho)                = snd rho
+
+instance Print Range where
+    prt (Range (i,j)) = "(" ++ show i ++ "-" ++ show j ++ ")"
+    prt (EmptyRange)  = "(?)"
+
+{-- Types --------------------------------------------------------------------
+  Linearization- and Range records implemented as lists
+-----------------------------------------------------------------------------}
+
+type LinRec c l t = [Lin c l t]
+ 
+type RangeRec   l = [(l, Range)]
+
+
+{-- Functions ----------------------------------------------------------------
+  Concatenation         : Concatenation of Ranges, Symbols and Linearizations 
+                          and records of Linearizations 
+  Record transformation : Makes a Range record from a fully instantiated
+                          Linearization record 
+  Record projection     : Given a label, returns the corresponding Range
+  Range restriction     : Range restriction of Tokens, Symbols, 
+                          Linearizations and Records given a list of Tokens
+  Record replacment     : Substitute a record for another in a list of Range 
+                          records
+  Argument substitution : Substitution of a Cat c to a Tok Range, where 
+                          Range is the cover of c
+			  Note: The argument is still a Symbol c Range
+  Subsumation           : Checks if a Range record subsumes another Range 
+                          record
+  Record unification    : Unification of two Range records
+-----------------------------------------------------------------------------}
+
+
+--- Concatenation ------------------------------------------------------------
+
+
+concSymbols :: [Symbol c Range] -> [[Symbol c Range]]
+concSymbols (Tok rng:Tok rng':toks) = do rng'' <- concatRange rng rng'
+					 concSymbols (Tok rng'':toks)
+concSymbols (sym:syms)              = do syms' <- concSymbols syms
+					 return (sym:syms')
+concSymbols []                      = return []
+
+
+concLin :: Lin c l Range -> [Lin c l Range]
+concLin (Lin lbl syms) = do syms' <- concSymbols syms
+			    return (Lin lbl syms')
+
+
+concLinRec :: LinRec c l Range -> [LinRec c l Range]
+concLinRec = mapM concLin 
+
+
+--- Record transformation ----------------------------------------------------
+
+makeRangeRec :: LinRec c l Range -> RangeRec l
+makeRangeRec lins = map convLin lins
+    where convLin (Lin lbl [Tok rng]) = (lbl, rng)
+	  convLin (Lin lbl []) = (lbl, EmptyRange)
+	  convLin _ = error "makeRangeRec"
+
+
+--- Record projection --------------------------------------------------------
+
+projection :: Ord l => l -> RangeRec l -> [Range]
+projection l rec = maybe (fail "projection") return $ lookup l rec
+
+
+--- Range restriction --------------------------------------------------------
+
+rangeRestTok :: Ord t => Input t -> t -> [Range]
+rangeRestTok toks tok = do rng <- inputToken toks ? tok
+			   return (makeRange rng)
+
+
+rangeRestSym :: Ord t => Input t -> Symbol a t -> [Symbol a Range]
+rangeRestSym toks (Tok tok) = do rng <- rangeRestTok toks tok
+				 return (Tok rng)
+rangeRestSym _ (Cat c)      = return (Cat c)
+
+
+rangeRestLin :: Ord t => Input t -> Lin c l t -> [Lin c l Range]
+rangeRestLin toks (Lin lbl syms) = do syms' <- mapM (rangeRestSym toks) syms
+				      concLin (Lin lbl syms')
+				      -- return (Lin lbl syms')
+
+
+rangeRestRec :: Ord t => Input t -> LinRec c l t -> [LinRec c l Range]
+rangeRestRec toks = mapM (rangeRestLin toks) 
+
+
+rangeRestrictRule :: Ord t => Input t -> MCFRule c n l t -> [MCFRule c n l Range]
+rangeRestrictRule toks (Rule abs (Cnc l ls lins)) = liftM (Rule abs . Cnc l ls) $
+						    rangeRestRec toks lins
+
+--- Argument substitution ----------------------------------------------------
+
+substArgSymbol :: Ord l => Int -> RangeRec l -> Symbol (c, l, Int) Range 
+	       -> Symbol (c, l, Int) Range
+substArgSymbol i rec tok@(Tok rng) = tok
+substArgSymbol i rec cat@(Cat (c, l, j))
+    | i==j      = maybe err Tok $ lookup l rec 
+    | otherwise = cat
+    where err = error "substArg: Label not in range-record"
+
+substArgLin :: Ord l => Int -> RangeRec l -> Lin c l Range 
+	    -> [Lin c l Range]
+substArgLin i rec (Lin lbl syms) = 
+    concLin (Lin lbl (map (substArgSymbol i rec) syms))
+
+
+substArgRec :: Ord l => Int -> RangeRec l -> LinRec c l Range 
+	    -> [LinRec c l Range]
+substArgRec i rec lins = mapM (substArgLin i rec) lins
+
+
+-- Record unification & replacment ---------------------------------------------------------
+
+unifyRec :: Ord l => [RangeRec l] -> Int -> RangeRec l -> [[RangeRec l]]
+unifyRec recs i rec = updateNthM update i recs
+    where update rec' = guard (subsumes rec' rec) >> return rec
+
+-- unifyRec recs i rec = do guard $ subsumes (recs !! i) rec
+-- 			 return $ replaceRec recs i rec
+
+replaceRec :: [RangeRec l] -> Int -> RangeRec l -> [RangeRec l]
+replaceRec recs i rec = before ++ (rec : after)
+    where (before, _ : after) = splitAt i recs
+
+subsumes :: Ord l => RangeRec l -> RangeRec l -> Bool
+subsumes rec rec' = and [r `elem` rec' | r <- rec]
+-- subsumes rec rec' = all (`elem` rec') rec
+
+
+{-
+--- Record unification -------------------------------------------------------
+unifyRangeRecs :: Ord l => [RangeRec l] -> [RangeRec l] -> [[RangeRec l]]
+unifyRangeRecs recs recs' = zipWithM unify recs recs'
+    where unify :: Ord l => RangeRec l -> RangeRec l -> [RangeRec l]
+	  unify rec [] = return rec
+	  unify [] rec = return rec
+	  unify rec1'@(p1@(l1, r1):rec1) rec2'@(p2@(l2, r2):rec2) 
+	      = case compare l1 l2 of
+		LT -> do rec3 <- unify rec1 rec2'
+			 return (p1:rec3)
+		GT -> do rec3 <- unify rec1' rec2
+			 return (p2:rec3)
+		EQ -> do guard (r1 == r2)
+			 rec3 <- unify rec1 rec2
+			 return (p1:rec3)
+-}
diff --git a/src-3.0/GF/Parsing/MCFG/ViaCFG.hs b/src-3.0/GF/Parsing/MCFG/ViaCFG.hs
new file mode 100644
index 000000000..9204ea9f1
--- /dev/null
+++ b/src-3.0/GF/Parsing/MCFG/ViaCFG.hs
@@ -0,0 +1,186 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/08/08 09:01:25 $
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.4 $
+--
+-- MCFG parsing, through context-free approximation
+-----------------------------------------------------------------------------
+
+module GF.Parsing.MCFG.ViaCFG where
+
+
+-- Haskell modules
+import Data.List
+import Control.Monad
+
+-- GF modules 
+import ConvertMCFGtoDecoratedCFG
+import qualified DecoratedCFParser as CFP
+import qualified DecoratedGrammar as CFG
+import Examples
+import GF.OldParsing.GeneralChart
+import qualified GF.OldParsing.MCFGrammar as MCFG
+import MCFParser
+import Nondet 
+import Parser
+import GF.Parsing.MCFG.Range
+
+
+{-- Datatypes -----------------------------------------------------------------
+Chart
+Item
+Key
+
+
+  Item  : Four different Items are used. PreMCFG for MCFG Pre Items, Pre are 
+          the Items returned by the pre-Functions and Mark are the 
+	  corresponding Items for the mark-Functions. For convenience correctly
+	  marked Mark Items are converted to Passive Items.
+I use dottedrule for convenience to keep track of wich daughter's RangeRec to look for.
+  AChart: A RedBlackMap with Items and Keys
+  AKey  :  
+------------------------------------------------------------------------------}
+
+--Ev ta bort några typer av Item och bara nyckla på det som är unikt för den typen...
+data Item     n c l   = PreMCFG (n, c) (RangeRec l) [RangeRec l]
+		      | Pre     (n, c) (RangeRec l) [l] [RangeRec l]
+		      | Mark    (n, c) (RangeRec l) (RangeRec l) [RangeRec l]
+		      | Passive (n, c) (RangeRec l) (RangeRec l)
+			deriving (Eq, Ord, Show)
+
+type AChart   n c l   = ParseChart (Item n c l) (AKey n c l)
+
+data AKey n c l       = Pr (n, c) l 
+		      | Pm (n, c) l
+                      | Mk (RangeRec l)
+		      | Ps (RangeRec l)
+                      | Useless
+			deriving (Eq, Ord, Show)
+
+
+{-- Parsing -------------------------------------------------------------------
+  recognize:
+  parse    : The Agenda consists of the Passive Items from context-free 
+             approximation (as PreMCFG Items) and the Pre Items inferred by
+             pre-prediction.
+  keyof    : Given an Item returns an appropriate Key for the Chart
+------------------------------------------------------------------------------}
+
+recognize strategy mcfg toks = chartMember (parse strategy mcfg toks)
+			       (Passive ("f", S) 
+				[("s" , MCFG.Range (0, n))]
+				[("p" , MCFG.Range (0, n2)), ("q", MCFG.Range (n2, n))])
+			       (Ps [("s" , MCFG.Range (0, n))])
+    where n  = length toks
+	  n2 = n `div` 2
+
+
+--parse :: (Ord n, Ord NT, Ord String, Eq t) => CFP.Strategy -> MCFG.Grammar n NT String t -> [t] 
+--      -> AChart n NT String
+parse strategy mcfg toks
+    = buildChart keyof 
+      [preCombine, markPredict, markCombine, convert]
+      (makePreItems (CFP.parse strategy (CFG.pInfo (convertGrammar mcfg)) [(S, "s")] toks) ++
+       (prePredict mcfg))
+
+ 
+keyof :: Item n c l -> AKey n c l
+keyof (PreMCFG head [(lbl, rng)] _) = Pm head lbl
+keyof (Pre head _ (lbl:lbls) _)     = Pr head lbl
+keyof (Mark _ _ _ (rec:recs))       = Mk rec
+keyof (Passive _ rec _)             = Ps rec
+keyof _                             = Useless
+
+
+{-- Initializing agenda -------------------------------------------------------
+  makePreItems: 
+------------------------------------------------------------------------------}
+
+makePreItems :: (Eq c, Ord i) => CFG.Grammar n (Edge (c, l)) i t -> [Item n c l]
+makePreItems cfchart 
+    = [ PreMCFG (fun, cat) [(lbl, MCFG.makeRange (i, j))] (symToRec beta) | 
+        CFG.Rule (Edge i j (cat,lbl)) beta fun <- cfchart ]
+
+
+prePredict :: (Ord n, Ord c, Ord l) => MCFG.Grammar n c l t -> [Item n c l]
+prePredict mcfg = 
+    [ Pre (f, nt) [] (getLables lins) (replicate (nrOfCats (head lins)) []) | 
+      MCFG.Rule nt nts lins f <- mcfg ]
+
+
+{-- Inference rules ---------------------------------------------------------
+  prePredict :  
+  preCombine :
+  markPredict:
+  markCombine:
+  convert    :
+----------------------------------------------------------------------------}
+
+preCombine :: (Ord n, Ord c, Ord l) => ParseChart (Item n c l) (AKey n c l) 
+	   -> Item n c l -> [Item n c l]
+preCombine chart (Pre head rec (l:ls) recs) =
+    [ Pre head (rec ++ [(l, r)]) ls recs'' |
+      PreMCFG head [(l, r)] recs' <- chartLookup chart (Pm head l),
+      recs'' <- solutions (unifyRangeRecs recs recs') ]
+preCombine chart (PreMCFG head [(l, r)] recs) =
+    [ Pre head (rec ++ [(l, r)]) ls recs'' |
+      Pre head rec (l:ls) recs' <- chartLookup chart (Pr head l),
+      recs'' <- solutions (unifyRangeRecs recs recs') ]
+preCombine _ _ = []
+
+
+markPredict :: (Ord n, Ord c, Ord l) => ParseChart (Item n c l) (AKey n c l) 
+	    -> Item n c l -> [Item n c l]
+markPredict _ (Pre (n, c) rec [] recs) = [Mark (n, c) rec [] recs]
+markPredict _ _                        = []
+
+
+markCombine :: (Ord n, Ord c, Ord l) => ParseChart (Item n c l) (AKey n c l) 
+	    -> Item n c l -> [Item n c l]
+markCombine chart (Mark (f, c) rec mRec (r:recs)) = 
+    [ Mark (f, c) rec (mRec ++ r) recs |
+      Passive _ r _ <- chartLookup chart (Ps r)]
+markCombine chart (Passive _ r _) =
+    [ Mark (f, c) rec (mRec++r) recs |
+      Mark (f, c) rec mRec (r:recs) <- chartLookup chart (Mk r) ]
+markCombine _ _ = []
+
+
+convert :: (Ord n, Ord c, Ord l) => ParseChart (Item n c l) (AKey n c l) 
+	-> Item n c l -> [Item n c l]
+convert _ (Mark (f, c) r rec []) = [Passive (f, c) r rec]
+convert _ _                      = []
+
+
+{-- Help functions ----------------------------------------------------------------
+  getRHS   :  
+  getLables:
+  symToRec :
+----------------------------------------------------------------------------------}
+
+-- FULKOD !
+nrOfCats :: Eq c => MCFG.Lin c l t  -> Int
+nrOfCats (MCFG.Lin l syms) = length $ nub [(c, i) | Cat (c, l, i) <- syms]
+
+
+--
+getLables :: LinRec c l t -> [l] 
+getLables lins = [l | MCFG.Lin l syms <- lins]
+
+
+--
+symToRec :: Ord i => [Symbol (Edge (c, l), i) d] -> [[(l, MCFG.Range)]]
+symToRec beta = map makeLblRng $ groupBy (\(_, d) (_, d') -> (d == d')) 
+		$ sortBy sBd [(Edge i j (c, l) , d) | Cat (Edge i j (c, l), d)  
+		    <- beta]
+    where makeLblRng edges = [(l, (MCFG.makeRange (i, j))) | (Edge i j (_, l), _) 
+			   <- edges]
+	  sBd (_, d) (_, d') 
+	      | d < d' = LT
+	      | d > d' = GT
+	      | otherwise = EQ