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https://github.com/GrammaticalFramework/gf-core.git
synced 2026-05-05 17:22:51 -06:00
Moved general XML stuff to GF.Data.XML. Started working on VoiceXML generation.
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bringert
195
src/GF/Speech/GrammarToVoiceXML.hs
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195
src/GF/Speech/GrammarToVoiceXML.hs
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----------------------------------------------------------------------
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-- |
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-- Module : GrammarToVoiceXML
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-- Maintainer : Bjorn Bringert
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- Create VoiceXML dialogue system from a GF grammar.
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-----------------------------------------------------------------------------
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module GF.Speech.GrammarToVoiceXML (grammar2vxml) where
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import qualified GF.Canon.GFC as GFC
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import GF.Grammar.Macros hiding (assign)
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import GF.Infra.Modules
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import GF.Data.Operations
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import GF.Data.XML
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import Data.List (isPrefixOf, find, intersperse)
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-- | the main function
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grammar2vxml :: GFC.CanonGrammar -> String
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grammar2vxml gr = showsXMLDoc (skel2vxml name startcat gr') ""
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where (name, gr') = vSkeleton gr
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startcat = "Order" -- FIXME
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type VIdent = String
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type VSkeleton = [(VIdent, [(VIdent, [VIdent])])]
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vSkeleton :: GFC.CanonGrammar -> (String,VSkeleton)
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vSkeleton gr = (name,collectR rules [(c,[]) | c <- cats]) where
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collectR rr hh =
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case rr of
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(fun,typ):rs -> case catSkeleton typ of
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Ok (cats,cat) ->
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collectR rs (updateSkeleton (symid (snd cat)) hh (fun,
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map (symid . snd) cats))
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_ -> collectR rs hh
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_ -> hh
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cats = [symid cat | (cat,GFC.AbsCat _ _) <- defs]
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rules = [(symid fun, typ) | (fun,GFC.AbsFun typ _) <- defs]
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defs = concat [tree2list (jments m) | im@(_,ModMod m) <- modules gr, isModAbs m]
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name = ifNull "UnknownModule" (symid . last) [n | (n,ModMod m) <- modules gr, isModAbs m]
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updateSkeleton :: VIdent -> VSkeleton -> (VIdent, [VIdent]) -> VSkeleton
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updateSkeleton cat skel rule =
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case skel of
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(cat0,rules):rr | cat0 == cat -> (cat0, rule:rules) : rr
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(cat0,rules):rr -> (cat0, rules) : updateSkeleton cat rr rule
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skel2vxml :: String -> VIdent -> VSkeleton -> XML
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skel2vxml name start skel =
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vxml ([startForm] ++ concatMap (uncurry (catForms gr)) skel)
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where
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gr = grammarURI name
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startForm = Tag "form" [] [subdialog "sub" [("src","#"++start)] []]
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grammarURI :: String -> String
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grammarURI name = name ++ ".grxml"
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catForms :: String -> VIdent -> [(VIdent, [VIdent])] -> [XML]
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catForms gr cat fs =
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comments [cat ++ " category."]
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++ [cat2form gr cat fs]
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++ map (uncurry (fun2form gr)) fs
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cat2form :: String -> VIdent -> [(VIdent, [VIdent])] -> XML
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cat2form gr cat fs =
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form cat [var "value" (Just "'?'"),
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field cat [] [promptString ("quest_"++cat),
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grammar (gr++"#"++cat),
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nomatch [Data "I didn't understand you.", reprompt],
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help [Data ("help_"++cat)],
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filled [] [if_else (cat ++ " == '?'") [reprompt] feedback]],
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subdialog "sub" [("srcexpr","'#'+"++cat++".name")]
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[param "value" cat, filled [] subDone]]
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where subDone = [return_ ["sub.value"]]
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feedback = [Data "Constructor: ", value (cat++".name")]
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fun2form :: String -> VIdent -> [VIdent] -> XML
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fun2form gr fun args =
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form fun ([var "value" Nothing]
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++ ss
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++ [ret])
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where
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argNames = zip ["arg"++show n | n <- [0..]] args
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ss = map (uncurry mkSub) argNames
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mkSub a t = subdialog a [("src","#"++t)]
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[param "value" ("value."++a),
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filled [] [assign ("value."++a) a]]
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ret = block [return_ ["value"]]
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--
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-- * VoiceXML stuff
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--
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vxml :: [XML] -> XML
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vxml = Tag "vxml" [("version","2.0"),("xmlns","http://www.w3.org/2001/vxml")]
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form :: String -> [XML] -> XML
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form id = Tag "form" [("id", id)]
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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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grammar :: String -> XML
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grammar uri = Tag "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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reprompt :: XML
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reprompt = Tag "reprompt" [] []
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assign :: String -> String -> XML
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assign n e = Tag "assign" [("name",n),("expr",e)] []
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value :: String -> XML
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value expr = Tag "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 = Tag "goto" [("nextitem",nextitem)] []
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return_ :: [String] -> XML
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return_ names = Tag "return" [("namelist", unwords names)] []
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block :: [XML] -> XML
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block = Tag "block" []
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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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param :: String -> String -> XML
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param name expr = Tag "param" [("name",name),("expr",expr)] []
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var :: String -> Maybe String -> XML
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var name expr = Tag "var" ([("name",name)]++e) []
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where e = maybe [] ((:[]) . (,) "expr") expr
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--
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-- * List stuff
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--
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isListCat :: (VIdent, [(VIdent, [VIdent])]) -> Bool
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isListCat (cat,rules) = "List" `isPrefixOf` cat && length rules == 2
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&& ("Base"++c) `elem` fs && ("Cons"++c) `elem` fs
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where c = elemCat cat
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fs = map fst rules
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-- | Gets the element category of a list category.
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elemCat :: VIdent -> VIdent
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elemCat = drop 4
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isBaseFun :: VIdent -> Bool
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isBaseFun f = "Base" `isPrefixOf` f
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isConsFun :: VIdent -> Bool
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isConsFun f = "Cons" `isPrefixOf` f
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baseSize :: (VIdent, [(VIdent, [VIdent])]) -> Int
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baseSize (_,rules) = length bs
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where Just (_,bs) = find (("Base" `isPrefixOf`) . fst) rules
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