Work on web api & apps based on the C run-time system

+ PGFService.hs: add command c-grammar, include probability in parse results
+ js/gftranslation.js: add start position and limit parameters, return more
  info to applications
+ Simple Translator: show two wide coverage translations
+ Wide coverage demo: show parse tree and probability (intended as grammar
  debugging aids)

src/server/PGFService.hs

@@ -89,21 +89,30 @@ cpgfMain command (pgf,pc) =
     "c-linearize" -> out =<< lin # tree % to
     "c-translate" -> out =<< join (trans # input % from % to % start % limit % trie)
     "c-flush"     -> out =<< flush
+    "c-grammar"   -> out grammar
     _             -> badRequest "Unknown command" command
   where
     flush = liftIO $ do modifyMVar_ pc $ const $ return Map.empty
                         performGC
                         return $ showJSON ()
 
+    grammar = showJSON $ makeObj
+                 ["name".=C.abstractName pgf,
+                  "startcat".=C.startCat pgf,
+                  "languages".=languages]
+      where
+        languages = [makeObj ["name".= l] | (l,_)<-Map.toList (C.languages pgf)]
+
     parse input (from,concr) start mlimit trie =
         do trees <- parse' input (from,concr) start mlimit
-           return $ showJSON [makeObj ("from".=from:"trees".=trees :[])]
+           return $ showJSON [makeObj ("from".=from:"trees".=map tp trees :[])]
                                                         -- :addTrie trie trees
-      where
+
+    tp (tree,prob) = makeObj ["tree".=tree,"prob".=prob]
 
     parse' input (from,concr) start mlimit = 
         liftIO $ do t <- getCurrentTime
-                    (map fst . maybe id take mlimit . drop start)
+                    (maybe id take mlimit . drop start)
                       # modifyMVar pc (parse'' t)
       where
         key = (from,input)
@@ -120,13 +129,14 @@ cpgfMain command (pgf,pc) =
     lin' tree tos = [makeObj ["to".=to,"text".=C.linearize c tree]|(to,c)<-tos]
 
     trans input (from,concr) tos start mlimit trie =
-      do trees <- parse' input (from,concr) start mlimit
+      do parses <- parse' input (from,concr) start mlimit
          return $
            showJSON [ makeObj ["from".=from,
                                "translations".=
                                  [makeObj ["tree".=tree,
+                                           "prob".=prob,
                                            "linearizations".=lin' tree tos]
-                                  | tree <- trees]]]
+                                  | (tree,prob) <- parses]]]
 
     from = maybe (missing "from") return =<< getLang "from"
     

src/www/js/gftranslate.js

@@ -5,30 +5,36 @@ var gftranslate = {}
 
 gftranslate.jsonurl="/robust/Translate8.pgf"
 gftranslate.grammar="Translate" // the name of the grammar
-gftranslate.languages="Bul Chi Eng Fin Fre Ger Hin Swe".split(" ")
-                    // hardwired for now
 
 gftranslate.call=function(querystring,cont) {
     http_get_json(gftranslate.jsonurl+querystring,cont)
 }
 
-// Translate a sentence to the given target language
-gftranslate.translate=function(source,from,to,cont) {
+// Translate a sentence
+gftranslate.translate=function(source,from,to,start,limit,cont) {
     var encsrc=encodeURIComponent(source)
     var g=gftranslate.grammar
-    function extract(result) {
-	cont(result[0].translations[0].linearizations[0].text)
-    }
+    function extract(result) { cont(result[0].translations) }
     if(encsrc.length<200) // match limit in runtime/c/utils/pgf-server.c
 	gftranslate.call("?command=c-translate&input="+encsrc
-		      +"&from="+g+from+"&to="+g+to+"&limit=1",extract)
-    else cont("[GF robust parser: sentence too long]")
+		      +"&from="+g+from+"&to="+g+to
+		      +"&start="+start+"&limit="+limit,extract)
+    else cont([{error:"sentence too long"}])
 }
 
 // Get functions to test which source and target langauges are supported
 gftranslate.get_support=function(cont) {
-    if(!gftranslate.targets) gftranslate.targets=toSet(gftranslate.languages)
-    function ssupport(code) { return gftranslate.targets[code] }
-    function tsupport(code) { return gftranslate.targets[code] }
-    cont(ssupport,tsupport)
+    function support(code) { return gftranslate.targets[code] }
+    function init2(grammar_info) {
+	var ls=grammar_info.languages
+	gftranslate.grammar=grammar_info.name
+	var langs=[], pre=gftranslate.grammar, n=pre.length
+	for(var i=0;i<ls.length;i++)
+	    if(ls[i].name.substr(0,n)==pre) langs.push(ls[i].name.substr(n))
+	gftranslate.targetlist=langs
+	gftranslate.targets=toSet(langs)
+	cont(support,support)
+    }
+    if(gftranslate.targets) cont(support,support)
+    else gftranslate.call("?command=c-grammar",init2)
 }

src/www/translator/translator.js

@@ -203,13 +203,19 @@ Translator.prototype.update_translation=function(i) {
 	    upd3(["[Apertium does not support "+show_translation(o)+"]"])
     }
     function update_gfrobust_translation() {
-	function upd3s(txt) { update_segment("GFRobust",[txt]) }
-	function upd2(ts,punct) {
-	    switch(ts.length) {
-	    case 0: upd3s("[no translation]");break;
-	    default:
-		if(punct) ts=ts+" "+punct
-		unlextext(ts,upd3s);
+	function upd3(txts) { update_segment("GFRobust",txts) }
+	function upd3s(txt) { upd3([txt]) }
+	function upd2(trans,punct) {
+	    if(trans.length==0) upd3s("[no translation]")
+	    else if(trans[0].error)
+		upd3s("[GF robust translation: "+trans[0].error+"]")
+	    else {
+		var ts=[]
+		for(var i=0;i<trans.length;i++) {
+		    ts[i]=trans[i].linearizations[0].text
+		    if(punct) ts[i]=ts[i]+" "+punct
+		}
+		mapc(unlextext,ts,upd3)
 	    }
 	}
 	function upd0(source,punct) {
@@ -217,7 +223,7 @@ Translator.prototype.update_translation=function(i) {
 		//console.log(translate_output)
 		upd2(translate_output,punct)
 	    }
-	    gftranslate.translate(source,o.from,o.to,upd1)
+	    gftranslate.translate(source,o.from,o.to,0,2,upd1)
 	}
 	if(!window.gftranslate)
 		upd3s("[GF robust parser is not available]")

src/www/wc.html

@@ -10,6 +10,7 @@ div.center { text-align: center; }
 table.center { margin-left: auto; margin-right: auto; }
 textarea { margin: 0; }
 body:target h1, body:target div.modtime { display: none; }
+#extra { color: #666; }
 </style>
 </head>
 
@@ -49,12 +50,14 @@ body:target h1, body:target div.modtime { display: none; }
     <button onclick="wcswap()">↑↓</button>
   <br>
       <textarea name=output rows=3 style="width: 100%" readonly></textarea>
+  <br>
 </form>
   
 </table>
+<div class=center><small id=extra></small></div>
 <p>
 <div class=modtime><small>
-<!-- hhmts start -->Last modified: Tue Jan 28 17:38:32 CET 2014 <!-- hhmts end -->
+<!-- hhmts start -->Last modified: Tue Feb 11 17:37:40 CET 2014 <!-- hhmts end -->
 </small></div>
 <script src="js/support.js"></script>
 <script src="js/gftranslate.js"></script>
@@ -64,16 +67,21 @@ body:target h1, body:target div.modtime { display: none; }
 <script>
 function wctranslate() {
   var f=document.forms[0]
+  var e=element("extra")
   f.translate.disabled=true
   f.output.value=""
+  clear(e)
 
   function showit(result) {
     f.output.value=result
     f.translate.disabled=false
   }
-  function step3(text) { unlextext(text,showit) }
+  function step3(trans) {
+    if(e) e.innerHTML=trans[0].prob+"<br>"+trans[0].tree
+    unlextext(trans[0].linearizations[0].text,showit)
+  }
   function step2(text) {
-    gftranslate.translate(text,f.from.value,f.to.value,step3)
+    gftranslate.translate(text,f.from.value,f.to.value,0,1,step3)
   }
   lextext(f.input.value,step2)
   return false;