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|
----------------------------------------------------------------------
-- |
-- Module : PrSLF
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/06/17 12:46:05 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.1 $
--
-- This module converts a CFG to an SLF finite-state network
-- for use with the ATK recognizer. The SLF format is described
-- in the HTK manual, and an example for use in ATK is shown
-- in the ATK manual.
--
-- FIXME: remove \/ warn \/ fail if there are int \/ string literal
-- categories in the grammar
-----------------------------------------------------------------------------
module GF.Speech.PrSLF (slfPrinter) where
import GF.Speech.SRG
import GF.Speech.TransformCFG
import GF.Infra.Ident
import GF.Formalism.CFG
import GF.Formalism.Utilities (Symbol(..))
import GF.Conversion.Types
import GF.Infra.Print
import GF.Infra.Option
import Data.Char (toUpper,toLower)
data SLF = SLF [SLFNode] [SLFEdge]
data SLFNode = SLFNode Int SLFWord
type SLFWord = Maybe String
data SLFEdge = SLFEdge Int Int Int
slfPrinter :: Ident -- ^ Grammar name
-> Options -> CGrammar -> String
slfPrinter name opts cfg = prSLF slf ""
where gr = makeNice cfg
gr' = makeRegular gr
srg = makeSRG name opts gr'
slf = srg2slf srg
srg2slf :: SRG -> SLF
srg2slf = undefined
prSLF :: SLF -> ShowS
prSLF (SLF ns es) = header . unlinesS (map prNode ns) . unlinesS (map prEdge es)
where
header = showString "VERSION=1.0" . nl
. prFields [("N",show (length ns)),("L", show (length es))] . nl
prNode (SLFNode i w) = prFields [("I",show i),("W",showWord w)]
prEdge (SLFEdge i s e) = prFields [("J",show i),("S",show s),("E",show e)]
showWord :: SLFWord -> String
showWord Nothing = "!NULL"
showWord (Just w) = w -- FIXME: convert words to upper case
prFields :: [(String,String)] -> ShowS
prFields fs = unwordsS [ showString l . showChar '=' . showString v | (l,v) <- fs ]
|
