forked from GitHub/gf-core
reintroduce the compiler API
This commit is contained in:
Krasimir Angelov
217
src/compiler/api/GF/Speech/VoiceXML.hs
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217
src/compiler/api/GF/Speech/VoiceXML.hs
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----------------------------------------------------------------------
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-- |
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-- Module : GF.Speech.VoiceXML
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--
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-- Creates VoiceXML dialogue systems from PGF grammars.
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-----------------------------------------------------------------------------
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module GF.Speech.VoiceXML (grammar2vxml) where
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import GF.Data.XML
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import PGF2
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import Data.List (intersperse) -- isPrefixOf, find
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import qualified Data.Map as Map
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import Data.Maybe (fromMaybe)
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--import Debug.Trace
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-- | the main function
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grammar2vxml :: PGF -> Concr -> String
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grammar2vxml pgf cnc = showsXMLDoc (skel2vxml name mb_language start skel qs) ""
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where skel = pgfSkeleton pgf
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name = concreteName cnc
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qs = catQuestions cnc (map fst skel)
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mb_language = languageCode cnc
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(_,start,_) = unType (startCat pgf)
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--
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-- * VSkeleton: a simple description of the abstract syntax.
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--
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type Skeleton = [(Cat, [(Fun, [Cat])])]
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pgfSkeleton :: PGF -> Skeleton
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pgfSkeleton pgf = [(c,[(f,[cat | (_,_,ty) <- hypos, let (_,cat,_) = unType ty]) | f <- functionsByCat pgf c, Just (hypos,_,_) <- [fmap unType (functionType pgf f)]])
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| c <- categories pgf]
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--
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-- * Questions to ask
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--
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type CatQuestions = [(Cat,String)]
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catQuestions :: Concr -> [Cat] -> CatQuestions
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catQuestions cnc cats = [(c,catQuestion cnc c) | c <- cats]
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catQuestion :: Concr -> Cat -> String
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catQuestion cnc cat = fromMaybe cat (printName cnc cat)
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getCatQuestion :: Cat -> CatQuestions -> String
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getCatQuestion c qs =
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fromMaybe (error "No question for category " ++ c) (lookup c qs)
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--
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-- * Generate VoiceXML
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--
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skel2vxml :: String -> Maybe String -> Cat -> Skeleton -> CatQuestions -> XML
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skel2vxml name language start skel qs =
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vxml language ([startForm] ++ concatMap (uncurry (catForms gr qs)) skel)
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where
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gr = grammarURI name
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startForm = Tag "form" [] [subdialog "sub" [("src", "#"++catFormId start)]
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[param "old" "{ name : '?' }"]]
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grammarURI :: String -> String
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grammarURI name = name ++ ".grxml"
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catForms :: String -> CatQuestions -> Cat -> [(Fun, [Cat])] -> [XML]
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catForms gr qs cat fs =
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comments [cat ++ " category."]
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++ [cat2form gr qs cat fs]
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cat2form :: String -> CatQuestions -> Cat -> [(Fun, [Cat])] -> XML
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cat2form gr qs cat fs =
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form (catFormId cat) $
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[var "old" Nothing,
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blockCond "old.name != '?'" [assign "term" "old"],
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field "term" []
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[promptString (getCatQuestion cat qs),
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vxmlGrammar (gr++"#"++catFormId cat)
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]
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]
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++ concatMap (uncurry (fun2sub gr cat)) fs
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++ [block [return_ ["term"]{-]-}]]
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fun2sub :: String -> Cat -> Fun -> [Cat] -> [XML]
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fun2sub gr cat fun args =
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comments [fun ++ " : ("
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++ concat (intersperse ", " args)
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++ ") " ++ cat] ++ ss
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where
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ss = zipWith mkSub [0..] args
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mkSub n t = subdialog s [("src","#"++catFormId t),
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("cond","term.name == "++string fun)]
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[param "old" v,
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filled [] [assign v (s++".term")]]
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where s = fun ++ "_" ++ show n
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v = "term.args["++show n++"]"
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catFormId :: Cat -> String
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catFormId c = c ++ "_cat"
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--
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-- * VoiceXML stuff
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--
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vxml :: Maybe String -> [XML] -> XML
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vxml ml = Tag "vxml" $ [("version","2.0"),
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("xmlns","http://www.w3.org/2001/vxml")]
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++ maybe [] (\l -> [("xml:lang", l)]) ml
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form :: String -> [XML] -> XML
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form id xs = Tag "form" [("id", id)] xs
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field :: String -> [(String,String)] -> [XML] -> XML
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field name attrs = Tag "field" ([("name",name)]++attrs)
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subdialog :: String -> [(String,String)] -> [XML] -> XML
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subdialog name attrs = Tag "subdialog" ([("name",name)]++attrs)
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filled :: [(String,String)] -> [XML] -> XML
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filled = Tag "filled"
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vxmlGrammar :: String -> XML
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vxmlGrammar uri = ETag "grammar" [("src",uri)]
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prompt :: [XML] -> XML
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prompt = Tag "prompt" []
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promptString :: String -> XML
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promptString p = prompt [Data p]
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{-
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reprompt :: XML
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reprompt = ETag "reprompt" []
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-}
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assign :: String -> String -> XML
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assign n e = ETag "assign" [("name",n),("expr",e)]
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{-
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value :: String -> XML
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value expr = ETag "value" [("expr",expr)]
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if_ :: String -> [XML] -> XML
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if_ c b = if_else c b []
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if_else :: String -> [XML] -> [XML] -> XML
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if_else c t f = cond [(c,t)] f
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cond :: [(String,[XML])] -> [XML] -> XML
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cond ((c,b):rest) els = Tag "if" [("cond",c)] (b ++ es)
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where es = [Tag "elseif" [("cond",c')] b' | (c',b') <- rest]
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++ if null els then [] else (Tag "else" [] []:els)
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goto_item :: String -> XML
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goto_item nextitem = ETag "goto" [("nextitem",nextitem)]
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-}
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return_ :: [String] -> XML
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return_ names = ETag "return" [("namelist", unwords names)]
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block :: [XML] -> XML
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block = Tag "block" []
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blockCond :: String -> [XML] -> XML
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blockCond cond = Tag "block" [("cond", cond)]
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{-
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throw :: String -> String -> XML
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throw event msg = Tag "throw" [("event",event),("message",msg)] []
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nomatch :: [XML] -> XML
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nomatch = Tag "nomatch" []
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help :: [XML] -> XML
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help = Tag "help" []
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-}
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param :: String -> String -> XML
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param name expr = ETag "param" [("name",name),("expr",expr)]
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var :: String -> Maybe String -> XML
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var name expr = ETag "var" ([("name",name)]++e)
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where e = maybe [] ((:[]) . (,) "expr") expr
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{-
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script :: String -> XML
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script s = Tag "script" [] [CData s]
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scriptURI :: String -> XML
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scriptURI uri = Tag "script" [("uri", uri)] []
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-}
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--
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-- * ECMAScript stuff
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--
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string :: String -> String
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string s = "'" ++ concatMap esc s ++ "'"
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where esc '\'' = "\\'"
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esc c = [c]
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{-
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--
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-- * List stuff
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--
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isListCat :: (CId, [(CId, [CId])]) -> Bool
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isListCat (cat,rules) = "List" `isPrefixOf` showIdent cat && length rules == 2
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&& ("Base"++c) `elem` fs && ("Cons"++c) `elem` fs
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where c = drop 4 (showIdent cat)
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fs = map (showIdent . fst) rules
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isBaseFun :: CId -> Bool
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isBaseFun f = "Base" `isPrefixOf` showIdent f
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isConsFun :: CId -> Bool
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isConsFun f = "Cons" `isPrefixOf` showIdent f
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baseSize :: (CId, [(CId, [CId])]) -> Int
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baseSize (_,rules) = length bs
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where Just (_,bs) = find (isBaseFun . fst) rules
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-}
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