[ADD] Added clone template in QWeb2 (t-name & t-extend)

bzr revid: fme@openerp.com-20110509121901-kmpcn7n6gsrjx6bl

addons/base/static/lib/qweb/qweb-test-extend.xml

@@ -24,4 +24,9 @@
 <t t-extend="jquery-extend">
     <t t-jquery="footer" t-operation="inner"><b>END</b></t>
 </t>
+
+<t t-name="jquery-extend-clone" t-extend="jquery-extend">
+    <t t-jquery="ul" t-operation="append"><li>CLONED TEMPLATE</li></t>
+</t>
+
 </templates>

addons/base/static/lib/qweb/qweb-test.js.html

@@ -251,6 +251,8 @@
             test("jQuery extend", function () {
                 equals(render('jquery-extend', {}), '<hr/><ul class="main"><li>1</li><li>2</li><li>3</li></ul><footer><b>END</b></footer>',
                         "Extend template with jQuery");
+                equals(render('jquery-extend-clone', {}), '<ul><li>one</li><li>CLONED TEMPLATE</li></ul>',
+                        "Clone template");
             });
         });
     </script>

addons/base/static/lib/qweb/qweb2.js

@@ -216,6 +216,15 @@ QWeb2.Engine = (function() {
                     }
                     var name = node.getAttribute(this.prefix + '-name');
                     var extend = node.getAttribute(this.prefix + '-extend');
+                    if (name && extend) {
+                        // Clone template and extend it
+                        if (!this.templates[extend]) {
+                            return this.tools.exception("Can't clone undefined template " + extend);
+                        }
+                        this.templates[name] = this.templates[extend].cloneNode(true);
+                        extend = name;
+                        name = undefined;
+                    }
                     if (name) {
                         this.templates[name] = node;
                     } else if (extend) {