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