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|
----------------------------------------------------------------------
-- |
-- Module : PrGSL
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/11/01 20:09:04 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.22 $
--
-- This module prints a CFG as a Nuance GSL 2.0 grammar.
--
-- FIXME: remove \/ warn \/ fail if there are int \/ string literal
-- categories in the grammar
-----------------------------------------------------------------------------
module GF.Speech.PrGSL (gslPrinter) where
import GF.Data.Utilities
import GF.Speech.SRG
import GF.Infra.Ident
import GF.Formalism.CFG
import GF.Formalism.Utilities (Symbol(..))
import GF.Conversion.Types
import GF.Infra.Print
import GF.Infra.Option
import GF.Probabilistic.Probabilistic (Probs)
import Data.Char (toUpper,toLower)
gslPrinter :: Ident -- ^ Grammar name
-> String -- ^ Start category
-> Options -> Maybe Probs -> CGrammar -> String
gslPrinter name start opts probs cfg = prGSL srg ""
where srg = topDownFilter $ makeSimpleSRG name start opts probs $ rmPunctCFG cfg
prGSL :: SRG -> ShowS
prGSL (SRG{grammarName=name,startCat=start,origStartCat=origStart,rules=rs})
= header . mainCat . unlinesS (map prRule rs)
where
header = showString ";GSL2.0" . nl
. comments ["Nuance speech recognition grammar for " ++ name,
"Generated by GF"] . nl . nl
mainCat = showString ("; Start category: " ++ origStart) . nl
. showString ".MAIN " . prCat start . nl . nl
prRule (SRGRule cat origCat rhs) =
showString "; " . prtS origCat . nl
. prCat cat . sp . wrap "[" (unwordsS (map prAlt rhs)) "]" . nl
-- FIXME: use the probability
prAlt (SRGAlt mp _ rhs) = wrap "(" (unwordsS (map prSymbol rhs)) ")"
prSymbol (Cat c) = prCat c
prSymbol (Tok t) = wrap "\"" (showString (showToken t)) "\""
-- GSL requires an upper case letter in category names
prCat c = showString (firstToUpper c)
firstToUpper :: String -> String
firstToUpper [] = []
firstToUpper (x:xs) = toUpper x : xs
rmPunctCFG :: CGrammar -> CGrammar
rmPunctCFG g = [CFRule c (filter keepSymbol ss) n | CFRule c ss n <- g]
keepSymbol :: Symbol c Token -> Bool
keepSymbol (Tok t) = not (all isPunct (prt t))
keepSymbol _ = True
-- Nuance does not like upper case characters in tokens
showToken :: Token -> String
showToken t = map toLower (prt t)
isPunct :: Char -> Bool
isPunct c = c `elem` "-_.:;.,?!()[]{}"
comments :: [String] -> ShowS
comments = unlinesS . map (showString . ("; " ++))
|
