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|
----------------------------------------------------------------------
-- |
-- Module : PrJSGF
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/11/01 20:09:04 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.16 $
--
-- This module prints a CFG as a JSGF grammar.
--
-- FIXME: remove \/ warn \/ fail if there are int \/ string literal
-- categories in the grammar
--
-- FIXME: convert to UTF-8
-----------------------------------------------------------------------------
module GF.Speech.PrJSGF (jsgfPrinter) where
import GF.Conversion.Types
import GF.Data.Utilities
import GF.Formalism.CFG
import GF.Formalism.Utilities (Symbol(..))
import GF.Infra.Ident
import GF.Infra.Print
import GF.Infra.Option
import GF.Probabilistic.Probabilistic (Probs)
import GF.Speech.SRG
import GF.Speech.RegExp
jsgfPrinter :: Ident -- ^ Grammar name
-> String -- ^ Start category
-> Options -> Maybe Probs -> CGrammar -> String
jsgfPrinter name start opts probs cfg = prJSGF srg ""
where srg = makeSimpleSRG name start opts probs cfg
prJSGF :: SRG -> ShowS
prJSGF (SRG{grammarName=name,startCat=start,origStartCat=origStart,rules=rs})
= header . mainCat . unlinesS (map prRule rs)
where
header = showString "#JSGF V1.0 UTF-8;" . nl
. comments ["JSGF speech recognition grammar for " ++ name,
"Generated by GF"] . nl
. showString ("grammar " ++ name ++ ";") . nl
. nl
mainCat = comments ["Start category: " ++ origStart] . nl
. showString "public <MAIN> = " . prCat start . showChar ';' . nl . nl
prRule (SRGRule cat origCat rhs) =
comments [origCat] . nl
. prCat cat . showString " = " . joinS " | " (map prAlt (ebnfSRGAlts rhs)) . nl
-- FIXME: use the probability
prAlt (EBnfSRGAlt mp _ rhs) = prItem rhs
prCat :: SRGCat -> ShowS
prCat c = showChar '<' . showString c . showChar '>'
prItem :: EBnfSRGItem -> ShowS
prItem = f
where
f (REUnion []) = showString "<VOID>"
f (REUnion xs) = wrap "(" (joinS " | " (map f xs)) ")"
f (REConcat []) = showString "<NULL>"
f (REConcat xs) = wrap "(" (unwordsS (map f xs)) ")"
f (RERepeat x) = wrap "(" (f x) ")" . showString "*"
f (RESymbol s) = prSymbol s
prSymbol :: Symbol SRGNT Token -> ShowS
prSymbol (Cat (c,_)) = prCat c
prSymbol (Tok t) | all isPunct (prt t) = id -- removes punctuation
| otherwise = wrap "\"" (prtS t) "\""
isPunct :: Char -> Bool
isPunct c = c `elem` "-_.;.,?!"
comments :: [String] -> ShowS
comments = unlinesS . map (showString . ("// " ++))
|
