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|
----------------------------------------------------------------------
-- |
-- Module : SRG
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/11/01 20:09:04 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.20 $
--
-- Representation of, conversion to, and utilities for
-- printing of a general Speech Recognition Grammar.
--
-- FIXME: remove \/ warn \/ fail if there are int \/ string literal
-- categories in the grammar
--
-- FIXME: figure out name prefix from grammar name
-----------------------------------------------------------------------------
module GF.Speech.SRG (SRG(..), SRGRule(..), SRGAlt(..),
makeSimpleSRG, makeSRG
, lookupFM_, prtS) where
import GF.Data.Operations
import GF.Data.Utilities
import GF.Infra.Ident
import GF.Formalism.CFG
import GF.Formalism.Utilities (Symbol(..), NameProfile(..)
, Profile, SyntaxForest)
import GF.Conversion.Types
import GF.Infra.Print
import GF.Speech.TransformCFG
import GF.Infra.Option
import GF.Probabilistic.Probabilistic (Probs)
import Data.List
import Data.Maybe (fromMaybe)
import Data.FiniteMap
data SRG = SRG { grammarName :: String -- ^ grammar name
, startCat :: String -- ^ start category name
, origStartCat :: String -- ^ original start category name
, grammarLanguage :: String -- ^ The language for which the grammar
-- is intended, e.g. en_UK
, rules :: [SRGRule]
}
deriving (Eq,Show)
data SRGRule = SRGRule String String [SRGAlt] -- ^ SRG category name, original category name
-- and productions
deriving (Eq,Show)
-- | maybe a probability, a rule name and a list of symbols
data SRGAlt = SRGAlt (Maybe Double) Name [Symbol String Token]
deriving (Eq,Show)
-- | SRG category name and original name
type CatName = (String,String)
type CatNames = FiniteMap String String
-- | Create a non-left-recursive SRG.
-- FIXME: the probabilities, names and profiles in the returned
-- grammar may be meaningless.
makeSimpleSRG :: Ident -- ^ Grammar name
-> Options -- ^ Grammar options
-> Maybe Probs -- ^ Probabilities
-> CGrammar -- ^ A context-free grammar
-> SRG
makeSimpleSRG
= makeSRG_ (removeLeftRecursion . removeIdenticalRules . removeEmptyCats)
-- | Create a SRG preserving the names, profiles and probabilities of the
-- input grammar. The returned grammar may be left-recursive.
makeSRG :: Ident -- ^ Grammar name
-> Options -- ^ Grammar options
-> Maybe Probs -- ^ Probabilities
-> CGrammar -- ^ A context-free grammar
-> SRG
makeSRG = makeSRG_ removeEmptyCats
makeSRG_ :: (CFRules -> CFRules) -- ^ Transformations to apply to the
-- CFG before converting to SRG
-> Ident -- ^ Grammar name
-> Options -- ^ Grammar options
-> Maybe Probs -- ^ Probabilities
-> CGrammar -- ^ A context-free grammar
-> SRG
makeSRG_ f i opts probs gr
= SRG { grammarName = name,
startCat = lookupFM_ names origStart,
origStartCat = origStart,
grammarLanguage = l,
rules = rs }
where
name = prIdent i
origStart = getStartCat opts
l = fromMaybe "en_UK" (getOptVal opts speechLanguage)
gr' = f (cfgToCFRules gr)
(cats,cfgRules) = unzip gr'
names = mkCatNames name cats
rs = map (cfgRulesToSRGRule names probs) cfgRules
-- FIXME: merge alternatives with same rhs and profile but different probabilities
cfgRulesToSRGRule :: FiniteMap String String -> Maybe Probs -> [CFRule_] -> SRGRule
cfgRulesToSRGRule names probs rs@(r:_) = SRGRule cat origCat rhs
where origCat = lhsCat r
cat = lookupFM_ names origCat
rhs = nub $ map ruleToAlt rs
ruleToAlt r@(CFRule c ss n)
= SRGAlt (ruleProb probs r) n (map renameCat ss)
renameCat (Cat c) = Cat (lookupFM_ names c)
renameCat t = t
ruleProb :: Maybe Probs -> CFRule_ -> Maybe Double
ruleProb mp r = mp >>= \probs -> lookupProb probs (ruleFun r)
-- FIXME: move to GF.Probabilistic.Probabilistic?
lookupProb :: Probs -> Ident -> Maybe Double
lookupProb probs i = lookupTree prIdent i probs
mkCatNames :: String -- ^ Category name prefix
-> [String] -- ^ Original category names
-> FiniteMap String String -- ^ Maps original names to SRG names
mkCatNames prefix origNames = listToFM (zip origNames names)
where names = [prefix ++ "_" ++ show x | x <- [0..]]
--
-- * Utilities for building and printing SRGs
--
lookupFM_ :: (Ord key, Show key) => FiniteMap key elt -> key -> elt
lookupFM_ fm k = lookupWithDefaultFM fm (error $ "Key not found: " ++ show k) k
prtS :: Print a => a -> ShowS
prtS = showString . prt
|
