gfrobust.js: adding a JavaScript API to the GF Robust Parser translation service

Factored out from the Simple Translation Tool.

src/www/js/gfrobust.js

@@ -0,0 +1,35 @@
+
+/* --- GF robust parser interface ------------------------------------------- */
+
+var gfrobust = {}
+
+gfrobust.url="http://www.grammaticalframework.org:41296/robust-parser.cgi"
+gfrobust.grammar="Parse" // the name of the grammar
+gfrobust.targetlist=[] // do not use, exposed only for debugging
+
+gfrobust.call=function(querystring,cont) {
+    http_get_json(gfrobust.url+querystring,cont)
+}
+
+// Translate a sentence to the given target language
+gfrobust.translate=function(source,to,cont) {
+    var enc=encodeURIComponent
+    gfrobust.call("?sentence="+enc(source)+"&to="+gfrobust.grammar+to,cont)
+}
+
+// Get functions to test which source and target langauges are supports
+gfrobust.get_support=function(cont) {
+    function ssupport(code) { return code=="Eng" }
+    function tsupport(code) { return gfrobust.targets[code] }
+    function init2(langstr) {
+	var ls=langstr.split(" "); // ls probably contains an empty string here
+	var langs=[], pre=gfrobust.grammar, n=pre.length
+	for(var i=0;i<ls.length;i++)
+	    if(ls[i].substr(0,n)==pre) langs.push(ls[i].substr(n))
+	gfrobust.targetlist=langs
+	gfrobust.targets=toSet(langs)
+	cont(ssupport,tsupport)
+    }
+    if(gfrobust.target) cont(ssupport,tsupport)
+    else gfrobust.call("",init2) // retrieve list of supported target languages
+}

src/www/translator/index.html

@@ -77,12 +77,13 @@
 </div>
 <hr>
 <div class=modtime><small>HMTL
-<!-- hhmts start -->Last modified: Fri Apr  5 15:09:28 CEST 2013 <!-- hhmts end -->
+<!-- hhmts start -->Last modified: Fri Apr 12 14:18:13 CEST 2013 <!-- hhmts end -->
 </small></div>
 <a href="about.html">About</a>
 
 <script type="text/javascript" src="../js/support.js"></script>
 <script type="text/javascript" src="../js/pgf_online.js"></script>
+<script type="text/javascript" src="../js/gfrobust.js"></script>
 <script type="text/javascript" src="../js/localstorage.js"></script>
 <script type="text/javascript" src="../gfse/localstorage.js"></script>
 <script type="text/javascript" src="../gfse/cloud2.js"></script>

src/www/translator/translator.js

@@ -118,7 +118,8 @@ Translator.prototype.update_language_menus=function() {
 	mark_menus(yes,yes)
 	break;
     case "GFRobust":
-	mark_menus(gfrobust_ssupport,gfrobust_tsupport)
+	if(window.gfrobust) gfrobust.get_support(mark_menus)
+	else mark_menus(no,no)
 	break;
     case "Apertium":
 	function ssupport(code) {
@@ -139,10 +140,6 @@ Translator.prototype.update_language_menus=function() {
     }
 }
 
-function gfrobust_ssupport(code) { return code=="Eng" }
-var gfrobust_targets=toSet(["Eng","Ger","Fin","Bul","Hin"]) // !!! Get list from server
-function gfrobust_tsupport(code) { return gfrobust_targets[code] }
-
 Translator.prototype.gf_supported=function(grammar,langcode) {
     var t=this;
     var concname=t.grammar_info[grammar].name+langcode
@@ -218,27 +215,31 @@ Translator.prototype.update_translation=function(i) {
 	    upd2(translate_output)
 	}
 	function upd0(source) {
-	    var url="http://www.grammaticalframework.org:41296/robust-parser.cgi"
-	    http_get_json(url+"?sentence="+encodeURIComponent(source)+"&to=Parse"+o.to,upd1)
-	}
-	var fls=gfrobust_ssupport(o.from)
-	var tls=gfrobust_tsupport(o.to)
-	if(fls && tls) {
-	    var want={from:o.from, to:o.to, method:"GFRobust"}
-	    if(!eq_options(segment.options,want)) {
-		//console.log("Updating "+i)
-		lextext(segment.source,upd0)
-		//upd0(segment.source)
-	    }
-	    //else console.log("No update ",want,segment.options)
+	    gfrobust.translate(source,o.to,upd1)
 	}
+	if(!window.gfrobust)
+		upd3(["[GF robust parser is not available]"])
 	else {
-	    var fn=" from "+concname(o.from)
-	    var tn=" to "+concname(o.to)
-	    var msg="The GF robust translation service: not supported:"
-	    if(!fls) msg+=fn+(tls ? "." : ", ")
-	    if(!tls) msg+=tn+"."
-	    upd3(["["+msg+"]"])
+	    function check_support(fls,tls) {
+		if(fls && tls) {
+		    var want={from:o.from, to:o.to, method:"GFRobust"}
+		    if(!eq_options(segment.options,want)) {
+			//console.log("Updating "+i)
+			lextext(segment.source,upd0)
+			//upd0(segment.source)
+		    }
+		    //else console.log("No update ",want,segment.options)
+		}
+		else {
+		    var fn=" from "+concname(o.from)
+		    var tn=" to "+concname(o.to)
+		    var msg="The GF robust translation service: not supported:"
+		    if(!fls) msg+=fn+(tls ? "." : ", ")
+		    if(!tls) msg+=tn+"."
+		    upd3(["["+msg+"]"])
+		}
+	    }
+	    gfrobust.get_support(check_support)
 	}
     }