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|
----------------------------------------------------------------------
-- |
-- Module : GF.Speech.SLF
--
-- 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.
--
-----------------------------------------------------------------------------
{-# LANGUAGE FlexibleContexts #-}
module GF.Speech.SLF (slfPrinter,slfGraphvizPrinter,
slfSubPrinter,slfSubGraphvizPrinter) where
import GF.Data.Utilities
import GF.Grammar.CFG
import GF.Speech.FiniteState
--import GF.Speech.CFG
import GF.Speech.CFGToFA
import GF.Speech.PGFToCFG
import qualified GF.Data.Graphviz as Dot
import PGF
--import PGF.CId
import Control.Monad
import qualified Control.Monad.State as STM
import Data.Char (toUpper)
--import Data.List
import Data.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 CFSymbol) ()
mkFAs :: PGF -> CId -> (SLF_FA, [(String,SLF_FA)])
mkFAs pgf cnc = (slfStyleFA main, [(c,slfStyleFA n) | (c,n) <- subs])
where MFA start subs = {- renameSubs $ -} cfgToMFA $ pgfToCFG pgf cnc
main = let (fa,s,f) = newFA_ in newTransition s f (NonTerminal start) fa
slfStyleFA :: Eq a => DFA a -> FA State (Maybe a) ()
slfStyleFA = renameStates [0..] . removeTrivialEmptyNodes . oneFinalState Nothing ()
. moveLabelsToNodes . dfa2nfa
{-
-- | Give sequential names to subnetworks.
renameSubs :: MFA -> MFA
renameSubs (MFA start subs) = MFA (newName start) subs'
where newNames = zip (map fst subs) ["sub"++show n | n <- [0..]]
newName s = lookup' s newNames
subs' = [(newName s,renameLabels n) | (s,n) <- subs]
renameLabels = mapTransitions (mapSymbol newName id)
-}
--
-- * SLF graphviz printing (without sub-networks)
--
slfGraphvizPrinter :: PGF -> CId -> String
slfGraphvizPrinter pgf cnc
= prFAGraphviz $ gvFA $ slfStyleFA $ cfgToFA' $ pgfToCFG pgf cnc
where
gvFA = mapStates (fromMaybe "") . mapTransitions (const "")
--
-- * SLF graphviz printing (with sub-networks)
--
slfSubGraphvizPrinter :: PGF -> CId -> String
slfSubGraphvizPrinter pgf cnc = Dot.prGraphviz g
where (main, subs) = mkFAs pgf cnc
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 -> SLF_FA -> STM.State [State] Dot.Graph
gvSLFFA n fa =
liftM (mkCluster n . faToGraphviz . mapStates (maybe "" mfaLabelToGv)
. mapTransitions (const "")) (rename fa)
where mfaLabelToGv = symbol ("#"++) id
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'
--
-- * SLF printing (without sub-networks)
--
slfPrinter :: PGF -> CId -> String
slfPrinter pgf cnc
= prSLF $ automatonToSLF mkSLFNode $ slfStyleFA $ cfgToFA' $ pgfToCFG pgf cnc
--
-- * SLF printing (with sub-networks)
--
-- | Make a network with subnetworks in SLF
slfSubPrinter :: PGF -> CId -> String
slfSubPrinter pgf cnc = prSLFs slfs
where
(main,subs) = mkFAs pgf cnc
slfs = SLFs [(c, faToSLF fa) | (c,fa) <- subs] (faToSLF main)
faToSLF = automatonToSLF mfaNodeToSLFNode
automatonToSLF :: (Int -> a -> SLFNode) -> FA State a () -> SLF
automatonToSLF mkNode fa = SLF { slfNodes = ns, slfEdges = es }
where ns = map (uncurry mkNode) (states fa)
es = zipWith (\i (f,t,()) -> mkSLFEdge i (f,t)) [0..] (transitions fa)
mfaNodeToSLFNode :: Int -> Maybe CFSymbol -> SLFNode
mfaNodeToSLFNode i l = case l of
Nothing -> mkSLFNode i Nothing
Just (Terminal x) -> mkSLFNode i (Just x)
Just (NonTerminal 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 -> String
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 -> String
prSLF slf = 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 ]
|
