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|
----------------------------------------------------------------------
-- |
-- Maintainer : PL
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/04/16 05:40:49 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.5 $
--
-- All conversions from GFC
-----------------------------------------------------------------------------
module GF.Conversion.GFC
(module GF.Conversion.GFC,
SGrammar, MGrammar, CGrammar) where
import Option
import GFC (CanonGrammar)
import Ident (Ident)
import GF.Conversion.Types (CGrammar, MGrammar, NGrammar, SGrammar)
import qualified GF.Conversion.GFCtoSimple as G2S
import qualified GF.Conversion.SimpleToFinite as S2Fin
import qualified GF.Conversion.RemoveSingletons as RemSing
import qualified GF.Conversion.RemoveErasing as RemEra
import qualified GF.Conversion.SimpleToMCFG as S2M
import qualified GF.Conversion.MCFGtoCFG as M2C
----------------------------------------------------------------------
-- * GFC -> MCFG & CFG, using options to decide which conversion is used
gfc2mcfg2cfg :: Options -> (CanonGrammar, Ident) -> (MGrammar, CGrammar)
gfc2mcfg2cfg opts = \g -> let m = g2m g in (m, m2c m)
where m2c = mcfg2cfg
g2m = case getOptVal opts gfcConversion of
Just "strict" -> simple2mcfg_strict . gfc2simple
Just "finite" -> simple2mcfg_nondet . gfc2finite
Just "finite-strict" -> simple2mcfg_strict . gfc2finite
_ -> simple2mcfg_nondet . gfc2simple
gfc2mcfg :: Options -> (CanonGrammar, Ident) -> MGrammar
gfc2mcfg opts = fst . gfc2mcfg2cfg opts
gfc2cfg :: Options -> (CanonGrammar, Ident) -> CGrammar
gfc2cfg opts = snd . gfc2mcfg2cfg opts
----------------------------------------------------------------------
-- * single step conversions
gfc2simple :: (CanonGrammar, Ident) -> SGrammar
gfc2simple = G2S.convertGrammar
simple2finite :: SGrammar -> SGrammar
simple2finite = S2Fin.convertGrammar
removeSingletons :: SGrammar -> SGrammar
removeSingletons = RemSing.convertGrammar
gfc2finite :: (CanonGrammar, Ident) -> SGrammar
gfc2finite = removeSingletons . simple2finite . gfc2simple
simple2mcfg_nondet :: SGrammar -> MGrammar
simple2mcfg_nondet = S2M.convertGrammarNondet
simple2mcfg_strict :: SGrammar -> MGrammar
simple2mcfg_strict = S2M.convertGrammarStrict
mcfg2cfg :: MGrammar -> CGrammar
mcfg2cfg = M2C.convertGrammar
removeErasing :: MGrammar -> NGrammar
removeErasing = RemEra.convertGrammar
-- | this function is unnecessary, because of the following equivalence:
--
-- > mcfg2cfg == ne_mcfg2cfg . removeErasing
--
ne_mcfg2cfg :: NGrammar -> CGrammar
ne_mcfg2cfg = M2C.convertNEGrammar
|
