gfse: allow definitions to be reordered by drad-and-drop

src/editor/simple/TODO

@@ -9,7 +9,7 @@
 
 - Allow languages other than the ones in the given list to be added
 + Export as plain text
-- Allow definitions to be reordered
++ Allow definitions to be reordered
 
 + 1. possibility to compile the grammar set, returning a URL to a translator app
 - 2. possibility to import modules - both resource libraries and user's own
@@ -18,7 +18,7 @@
 + 4. access to the created files in an on-line shell (making testing possible)
 - 5. rule-to-rule type checking and guidance (e.g. with library oper
      suggestions)
--    Try grammars in the Translation Quiz
++    Try grammars in the Translation Quiz
 
 + compile only the uploaded grammar even if other grammars are present
 + 'flags startcat' is needed for grammars with only one category (since the

src/editor/simple/editor.js

@@ -248,13 +248,17 @@ function draw_abstract(g) {
     var flags=g.abstract.startcat || g.abstract.cats.length>1
 	? draw_startcat(g)
 	: text("");
+    function sort_funs() {
+	g.abstract.funs=sort_list(this,g.abstract.funs,"name");
+	save_grammar(g);
+    }
     return div_id("file",
 		  [kw("abstract "),ident(g.basename),sep(" = "),
 		   flags,
 		   indent([extensible([kw_cat,
 				       indent(draw_cats(g))]),
 			   extensible([kw_fun,
-				       indent(draw_funs(g))])])]);
+				       indent_sortable(draw_funs(g),sort_funs)])])]);
 }
 
 function add_cat(g,el) {
@@ -371,7 +375,7 @@ function draw_funs(g) {
     }
 //  for(var i=0;i<funs.length;i++) {
     for(var i in funs) {
-	es.push(div_class("fun",[deletable(del(i),draw_efun(i,df),"Delete this function")]));
+	es.push(node_sortable("fun",funs[i].name,[deletable(del(i),draw_efun(i,df),"Delete this function")]));
 	df[funs[i].name]=true;
     }
     es.push(more(g,add_fun,"Add a new function"));
@@ -525,14 +529,18 @@ function draw_lincats(g,i) {
 	var l2= err ? deletable(del(cat),l1,"Delete this lincat") : l1;
 	var l=ifError(err,"lincat for undefined category",l2);
 	delete dc[cat];
-	return wrap("div",l);
+	return node_sortable("lincat",cat,[l]);
     }
     function dtmpl(c) {	
 	return wrap("div",dlc({cat:c,type:"",template:true},"template")); }
     var lcs=map(draw_lincat,conc.lincats);
     for(var c in dc)
 	lcs.push(dtmpl(c));
-    return indent(lcs);
+    function sort_lincats() {
+	conc.lincats=sort_list(this,conc.lincats,"cat");
+	save_grammar(g);
+    }
+    return indent_sortable(lcs,sort_lincats);
 }
 
 /* -------------------------------------------------------------------------- */
@@ -591,12 +599,18 @@ function draw_opers(g,ci) {
 	return editable("span",draw_oper(opers[i],dp),g,edit_oper(ci,i),"Edit this operator definition");
     }
     for(var i in opers) {
-	es.push(div_class("oper",[deletable(del(i),draw_eoper(i,dp),"Delete this operator definition")]));
+	es.push(node_sortable("oper",opers[i].name,
+			      [deletable(del(i),draw_eoper(i,dp),
+					 "Delete this operator definition")]));
 	dp[opers[i].name]=true;
     }
     es.push(more(g,function(g,el) { return add_oper(g,ci,el)},
 		 "Add a new operator definition"));
-    return indent(es);
+    function sort_opers() {
+	conc.opers=sort_list(this,conc.opers,"name");
+	save_grammar(g);
+    }
+    return indent_sortable(es,sort_opers);
 }
 
 function delete_lin(g,ci,fun) {
@@ -654,7 +668,7 @@ function draw_lins(g,i) {
 	var l= err ? deletable(del(fun),dl(f,"lin"),"Delete this function") : dl(f,"lin")
 	var l=ifError(err,"Function "+fun+" is not part of the abstract syntax",l);
 	delete df[fun];
-	return wrap("div",l);
+	return node_sortable("lin",fun,[l]);
     }
     function largs(f) {
 	var funs=g.abstract.funs;
@@ -665,10 +679,14 @@ function draw_lins(g,i) {
 	return wrap("div",
 		    dl({fun:f,args:largs(f),lin:"",template:true},"template"));
     }
+    function sort_lins() {
+	conc.lins=sort_list(this,conc.lins,"fun");
+	save_grammar(g);
+    }
     var ls=map(draw_lin,conc.lins);
     for(var f in df)
 	ls.push(dtmpl(f));
-    return indent(ls);
+    return indent_sortable(ls,sort_lins);
 }
 
 /* -------------------------------------------------------------------------- */
@@ -700,6 +718,29 @@ function hidden(name,value) {
 
 /* -------------------------------------------------------------------------- */
 
+function sort_list(list,olditems,key) {
+    var items=[];
+    function find(fun) {
+	for(var i=0;i<olditems.length;i++)
+	    if(olditems[i][key]==fun) return olditems[i];
+	return null;
+    }
+    for(var el=list.firstChild;el;el=el.nextSibling) {
+	var name=el.getAttribute("ident")
+	if(name) {
+	    var old=find(name);
+	    if(old) items.push(old)
+	    else debug("Bug: did not find "+name+" while sorting");
+	}
+    }
+    if(items.length==olditems.length)
+	return items;
+    else {
+	debug("Bug: length changed while sorting")
+	return olditems;
+    }
+}
+
 function string_editor(el,init,ok) {
     var p=el.parentNode;
     function restore() {
@@ -743,6 +784,16 @@ function sep(txt) { return wrap_class("span","sep",text(txt)); }
 function ident(txt) { return wrap_class("span","ident",text(txt)); }
 function indent(cs) { return div_class("indent",cs); }
 
+function indent_sortable(cs,sort) {
+    var n= indent(cs);
+    n.onsort=sort;
+    return n;
+}
+
+function node_sortable(cls,name,ls) {
+    return node("div",{"class":cls,"ident":name},ls);
+}
+
 function extensible(cs) { return div_class("extensible",cs); }
 
 function more(g,action,hint) {

src/editor/simple/index.html

@@ -38,5 +38,6 @@ HTML
 <script type="text/javascript" src="localstorage.js"></script>
 <script type="text/javascript" src="gf_abs.js"></script>
 <script type="text/javascript" src="editor.js"></script>
+<script type="text/javascript" src="sort.js"></script>
 </body>
 </html>