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
+}