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|
----------------------------------------------------------------------
-- |
-- Module : CFtoSRG
-- Maintainer : Markus Forsberg
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/04/21 16:21:10 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.6 $
--
-- This module prints a CF as a SRG (Speech Recognition Grammar).
-- Created : 21 January, 2001.
-- Modified : 16 April, 2004 by Aarne Ranta for GF 2.
-----------------------------------------------------------------------------
module GF.CF.CFtoSRG (prSRG) where
import GF.Data.Operations
import GF.CF.CF
import GF.CF.CFIdent
---import UseGrammar
import GF.CF.PPrCF
import Data.List (intersperse,nub)
header :: String
header = unlines ["#ABNF 1.0 ISO-8859-1;\n",
"language en;",
"mode voice;",
"root $Main;",
"meta \"author\" is \"Grammatical Framework\";\n"]
prSRG :: CF -> String
prSRG cf = (header ++) $ prSRGC (catsOfCF cf) cf
prSRGC :: [CFCat] -> CF -> String
prSRGC [] _ = []
prSRGC (c:cs) cf = "$" ++ prCFCat c ++ " = " ++ items ++ ";\n"++ prSRGC cs cf
where items = concat $ intersperse " | " $
map f $ nub $ map valItemsCF (rulesForCFCat cf c)
f [] = "$NULL"
f xs = unwords $ map prSRGItem xs
prSRGItem :: CFItem -> [Char]
prSRGItem (CFNonterm c) = "$" ++ prCFCat c
prSRGItem (CFTerm a) = prRegExp a
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