gfse: supply information about what's defined in the exampe language to the server functions for example-based grammar writing

src/www/gfse/example_based.js

@@ -51,8 +51,8 @@ function ask_possibilities(g,ci) {
 	if(!conc.example_lang) conc.example_lang=g.concretes[0].langcode;
 	reload_grammar(g);
     }
-    
-    exb_call(g,ci,"possibilities",{},show_poss)
+    var exci=conc_index(g,conc.example_lang);
+    exb_call(g,ci,"possibilities",{example_state:exb_state(g,exci)},show_poss)
 }
 
 var parser = { Eng: "ParseEngAbs.pgf",

src/www/gfse/gf_abs.js

@@ -14,18 +14,29 @@ function defined_funs(g) {
     return df;
 }
 
+// Return the type of a named function in the abstract syntax
 function function_type(g,fun) {
     with(g.abstract)
 	for(var i in funs) if(funs[i].name==fun) return funs[i].type
     return null;
 }
 
+// Return the lincat defined in a given concrete syntax for an abstract category
 function cat_lincat(conc,cat) {
     with(conc)
 	for(var i in lincats) if(lincats[i].cat==cat) return lincats[i].type
     return null;
 }
 
+// Return the index of the concrete syntax with a given langcode
+function conc_index(g,langcode) {
+    var c=g.concretes;
+    for(var ix=0;ix<c.length;ix++)
+	if(c[ix].langcode==langcode) return ix
+    return null;
+}
+
+
 function rename_category(g,oldcat,newcat) {
     function rename_cats(cats) {
 	for(var i in cats) if(cats[i]==oldcat) cats[i]=newcat;