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{-
**************************************************************
GF Module
Description : This module prints a CFG as a JSGF grammar.
Author : Björn Bringert (bringert@cs.chalmers.se)
License : GPL (GNU General Public License)
Created : October 1, 2004
Modified :
**************************************************************
-}
-- FIXME: remove / warn / fail if there are int / string literal
-- categories in the grammar
-- FIXME: convert to UTF-8
module PrJSGF (jsgfPrinter) where
import SRG
import Ident
import CFGrammar
import Parser (Symbol(..))
import GrammarTypes
import PrintParser
import Option
jsgfPrinter :: Ident -- ^ Grammar name
-> Options -> CFGrammar -> String
jsgfPrinter name opts cfg = prJSGF srg ""
where srg = makeSRG name opts 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 " = " . join " | " (map prAlt rhs) . nl
prAlt rhs | null rhs' = showString "<NULL>"
| otherwise = wrap "(" (unwordsS (map prSymbol rhs')) ")"
where rhs' = rmPunct rhs
prSymbol (Cat c) = prCat c
prSymbol (Tok t) = wrap "\"" (prtS t) "\""
prCat c = showChar '<' . showString c . showChar '>'
rmPunct :: [Symbol String Token] -> [Symbol String Token]
rmPunct [] = []
rmPunct (Tok t:ss) | all isPunct (prt t) = rmPunct ss
rmPunct (s:ss) = s : rmPunct ss
isPunct :: Char -> Bool
isPunct c = c `elem` "-_.;.,?!"
comments :: [String] -> ShowS
comments = unlinesS . map (showString . ("// " ++))
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