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|
----------------------------------------------------------------------
-- |
-- Maintainer : PL
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/05/09 09:28:43 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.6 $
--
-- Converting MCFG grammars to equivalent optimized FCFG
-----------------------------------------------------------------------------
module GF.Conversion.MCFGtoFCFG
(convertGrammar) where
import Control.Monad
import List (elemIndex)
import Array
import GF.Formalism.Utilities
import GF.Formalism.GCFG
import GF.Formalism.MCFG
import GF.Formalism.FCFG
import GF.Conversion.Types
import GF.Data.SortedList (nubsort)
import GF.Infra.Print
----------------------------------------------------------------------
-- * converting MCFG to optimized FCFG
convertGrammar :: MGrammar -> FGrammar
convertGrammar gram = [ FRule (Abs (fcat cat) (map fcat cats) name) (fcnc cnc) |
Rule (Abs cat cats name) cnc <- gram ]
where mcats = nubsort [ mc | Rule (Abs mcat mcats _) _ <- gram, mc <- mcat:mcats ]
fcat mcat@(MCat (ECat scat ecns) mlbls)
= case elemIndex mcat mcats of
Just catid -> FCat catid scat mlbls ecns
Nothing -> error ("MCFGtoFCFG.fcat " ++ prt mcat)
fcnc (Cnc _ arglbls lins) = listArray (0, length lins-1) (map flin lins)
where flin (Lin _ syms) = listArray (0, length syms-1) (map fsym syms)
fsym (Tok tok) = FSymTok tok
fsym (Cat (cat,lbl,arg)) = FSymCat (fcat cat) (flbl arg lbl) arg
flbl arg lbl = case elemIndex lbl (arglbls !! arg) of
Just lblid -> lblid
Nothing -> error ("MCFGtoFCFG.flbl " ++ prt arg ++ " " ++ prt lbl)
|
