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|
----------------------------------------------------------------------
-- |
-- Module : PrSLF
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/11/10 16:43:44 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.12 $
--
-- 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,slfGraphvizPrinter) where
import GF.Data.Utilities
import GF.Conversion.Types
import GF.Formalism.CFG
import GF.Formalism.Utilities (Symbol(..),symbol)
import GF.Infra.Ident
import GF.Infra.Option
import GF.Infra.Print
import GF.Speech.CFGToFiniteState
import GF.Speech.FiniteState
import GF.Speech.SRG
import GF.Speech.TransformCFG
import qualified GF.Visualization.Graphviz as Dot
import Control.Monad
import qualified Control.Monad.State as STM
import Data.Char (toUpper)
import Data.List
import Data.Maybe (maybe)
data SLFs = SLFs [(String,SLF)] SLF
data SLF = SLF { slfNodes :: [SLFNode], slfEdges :: [SLFEdge] }
data SLFNode = SLFNode { nId :: Int, nWord :: SLFWord, nTag :: Maybe String }
| SLFSubLat { nId :: Int, nLat :: String }
-- | An SLF word is a word, or the empty string.
type SLFWord = Maybe String
data SLFEdge = SLFEdge { eId :: Int, eStart :: Int, eEnd :: Int }
type SLF_FA = FA State (Maybe (MFALabel String)) ()
-- | Make a network with subnetworks in SLF
slfPrinter :: Ident -- ^ Grammar name
-> Options -> CGrammar -> String
slfPrinter name opts cfg = prSLFs (mfaToSLFs $ cfgToMFA opts cfg) ""
slfGraphvizPrinter :: Ident -- ^ Grammar name
-> Options -> CGrammar -> String
slfGraphvizPrinter name opts cfg = Dot.prGraphviz g
where MFA main subs = cfgToMFA opts cfg
g = STM.evalState (liftM2 Dot.addSubGraphs ss m) [0..]
ss = mapM (\ (c,f) -> gvSLFFA (Just c) f) subs
m = gvSLFFA Nothing main
gvSLFFA :: Maybe String -> DFA (MFALabel String) -> STM.State [State] Dot.Graph
gvSLFFA n fa =
liftM (mkCluster n . faToGraphviz . mapStates (maybe "" mfaLabelToGv)
. mapTransitions (const "")) (rename $ slfStyleFA fa)
where mfaLabelToGv (MFASym s) = s
mfaLabelToGv (MFASub s) = "#" ++ s
mkCluster Nothing = id
mkCluster (Just x)
= Dot.setName ("cluster_"++x) . Dot.setAttr "label" x
rename fa = do
names <- STM.get
let fa' = renameStates names fa
names' = unusedNames fa'
STM.put names'
return fa'
mapMFA :: (DFA (MFALabel a) -> b) -> MFA a -> (b,[(String,b)])
mapMFA f (MFA main subs) = (f main, [(c, f fa) | (c,fa) <- subs])
slfStyleFA :: DFA (MFALabel String) -> SLF_FA
slfStyleFA = oneFinalState Nothing () . moveLabelsToNodes . dfa2nfa
mfaToSLFs :: MFA String -> SLFs
mfaToSLFs (MFA main subs)
= SLFs [(c, dfaToSLF fa) | (c,fa) <- subs] (dfaToSLF main)
where dfaToSLF = automatonToSLF . slfStyleFA
automatonToSLF :: SLF_FA -> SLF
automatonToSLF fa = SLF { slfNodes = ns, slfEdges = es }
where ns = map (uncurry mfaNodeToSLFNode) (states fa)
es = zipWith (\i (f,t,()) -> mkSLFEdge i (f,t)) [0..] (transitions fa)
mfaNodeToSLFNode :: Int -> Maybe (MFALabel String) -> SLFNode
mfaNodeToSLFNode i l = case l of
Nothing -> mkSLFNode i Nothing
Just (MFASym x) -> mkSLFNode i (Just x)
Just (MFASub s) -> mkSLFSubLat i s
mkSLFNode :: Int -> Maybe String -> SLFNode
mkSLFNode i Nothing = SLFNode { nId = i, nWord = Nothing, nTag = Nothing }
mkSLFNode i (Just w)
| isNonWord w = SLFNode { nId = i,
nWord = Nothing,
nTag = Just w }
| otherwise = SLFNode { nId = i,
nWord = Just (map toUpper w),
nTag = Just w }
mkSLFSubLat :: Int -> String -> SLFNode
mkSLFSubLat i sub = SLFSubLat { nId = i, nLat = sub }
mkSLFEdge :: Int -> (Int,Int) -> SLFEdge
mkSLFEdge i (f,t) = SLFEdge { eId = i, eStart = f, eEnd = t }
prSLFs :: SLFs -> ShowS
prSLFs (SLFs subs main) = unlinesS (map prSub subs) . prOneSLF main
where prSub (n,s) = showString "SUBLAT=" . shows n
. nl . prOneSLF s . showString "." . nl
prSLF :: SLF -> ShowS
prSLF slf = {- showString "VERSION=1.0" . nl . -} prOneSLF slf
prOneSLF :: SLF -> ShowS
prOneSLF (SLF { slfNodes = ns, slfEdges = es})
= header . unlinesS (map prNode ns) . nl . unlinesS (map prEdge es) . nl
where
header = prFields [("N",show (length ns)),("L", show (length es))] . nl
prNode (SLFNode { nId = i, nWord = w, nTag = t })
= prFields $ [("I",show i),("W",showWord w)]
++ maybe [] (\t -> [("s",t)]) t
prNode (SLFSubLat { nId = i, nLat = l })
= prFields [("I",show i),("L",show l)]
prEdge e = prFields [("J",show (eId e)),("S",show (eStart e)),("E",show (eEnd e))]
-- | Check if a word should not correspond to a word in the SLF file.
isNonWord :: String -> Bool
isNonWord = any isPunct
isPunct :: Char -> Bool
isPunct c = c `elem` "-_.;.,?!()[]{}"
showWord :: SLFWord -> String
showWord Nothing = "!NULL"
showWord (Just w) | null w = "!NULL"
| otherwise = w
prFields :: [(String,String)] -> ShowS
prFields fs = unwordsS [ showString l . showChar '=' . showString v | (l,v) <- fs ]
|
