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