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+---------------------------------------------------------------------
+-- |
+-- Maintainer : Krasimir Angelov
+-- Stability : (stable)
+-- Portability : (portable)
+--
+-- FCFG parsing, parser information
+-----------------------------------------------------------------------------
+
+module GF.Parsing.FCFG.PInfo where
+
+import GF.Infra.PrintClass
+import GF.Formalism.Utilities
+import GF.Formalism.FCFG
+import GF.Data.SortedList
+import GF.Data.Assoc
+import GF.Parsing.FCFG.Range
+import qualified GF.GFCC.CId as AbsGFCC
+
+import Data.Array
+import Data.Maybe
+import qualified Data.Map as Map
+import qualified Data.Set as Set
+import Debug.Trace
+
+----------------------------------------------------------------------
+-- type declarations
+
+-- | the list of categories = possible starting categories
+type FCFParser = FCFPInfo
+ -> [FCat]
+ -> Input FToken
+ -> SyntaxChart FName (FCat,RangeRec)
+
+makeFinalEdge cat 0 0 = (cat, [EmptyRange])
+makeFinalEdge cat i j = (cat, [makeRange i j])
+
+------------------------------------------------------------
+-- parser information
+
+type RuleId = Int
+
+data FCFPInfo
+ = FCFPInfo { allRules :: Array RuleId FRule
+ , topdownRules :: Assoc FCat (SList RuleId)
+ -- ^ used in 'GF.Parsing.MCFG.Active' (Earley):
+ -- , emptyRules :: [RuleId]
+ , epsilonRules :: [RuleId]
+ -- ^ used in 'GF.Parsing.MCFG.Active' (Kilbury):
+ , leftcornerCats :: Assoc FCat (SList RuleId)
+ , leftcornerTokens :: Assoc FToken (SList RuleId)
+ -- ^ used in 'GF.Parsing.MCFG.Active' (Kilbury):
+ , grammarCats :: SList FCat
+ , grammarToks :: SList FToken
+ , startupCats :: Map.Map AbsGFCC.CId [FCat]
+ }
+
+
+getLeftCornerTok lins
+ | inRange (bounds syms) 0 = case syms ! 0 of
+ FSymTok tok -> Just tok
+ _ -> Nothing
+ | otherwise = Nothing
+ where
+ syms = lins ! 0
+
+getLeftCornerCat lins
+ | inRange (bounds syms) 0 = case syms ! 0 of
+ FSymCat c _ _ -> Just c
+ _ -> Nothing
+ | otherwise = Nothing
+ where
+ syms = lins ! 0
+
+buildFCFPInfo :: FGrammar -> FCFPInfo
+buildFCFPInfo (grammar,startup) = -- trace (unlines [prt (x,Set.toList set) | (x,set) <- Map.toList leftcornFilter]) $
+ FCFPInfo { allRules = allrules
+ , topdownRules = topdownrules
+ -- , emptyRules = emptyrules
+ , epsilonRules = epsilonrules
+ , leftcornerCats = leftcorncats
+ , leftcornerTokens = leftcorntoks
+ , grammarCats = grammarcats
+ , grammarToks = grammartoks
+ , startupCats = startup
+ }
+
+ where allrules = listArray (0,length grammar-1) grammar
+ topdownrules = accumAssoc id [(cat, ruleid) | (ruleid, FRule _ _ cat _) <- assocs allrules]
+ -- emptyrules = [ruleid | (ruleid, FRule _ [] _ _) <- assocs allrules]
+ epsilonrules = [ ruleid | (ruleid, FRule _ _ _ lins) <- assocs allrules,
+ not (inRange (bounds (lins ! 0)) 0) ]
+ leftcorncats = accumAssoc id
+ [ (fromJust (getLeftCornerCat lins), ruleid) |
+ (ruleid, FRule _ _ _ lins) <- assocs allrules, isJust (getLeftCornerCat lins) ]
+ leftcorntoks = accumAssoc id
+ [ (fromJust (getLeftCornerTok lins), ruleid) |
+ (ruleid, FRule _ _ _ lins) <- assocs allrules, isJust (getLeftCornerTok lins) ]
+ grammarcats = aElems topdownrules
+ grammartoks = nubsort [t | (FRule _ _ _ lins) <- grammar, lin <- elems lins, FSymTok t <- elems lin]
+
+fcfPInfoToFGrammar :: FCFPInfo -> FGrammar
+fcfPInfoToFGrammar pinfo = (elems (allRules pinfo), startupCats pinfo)
+
+----------------------------------------------------------------------
+-- pretty-printing of statistics
+
+instance Print FCFPInfo where
+ prt pI = "[ allRules=" ++ sl (elems . allRules) ++
+ "; tdRules=" ++ sla topdownRules ++
+ -- "; emptyRules=" ++ sl emptyRules ++
+ "; epsilonRules=" ++ sl epsilonRules ++
+ "; lcCats=" ++ sla leftcornerCats ++
+ "; lcTokens=" ++ sla leftcornerTokens ++
+ "; categories=" ++ sl grammarCats ++
+ " ]"
+
+ where sl f = show $ length $ f pI
+ sla f = let (as, bs) = unzip $ aAssocs $ f pI
+ in show (length as) ++ "/" ++ show (length (concat bs))
+