Adding Element.created constructor

tools/dom/scripts/systemhtml.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the system to generate
 Dart:html APIs from the IDL database."""
 
 import emitter
 import logging
@@ skipping 575 matching lines @@
 
     self._backend.EmitHelpers(base_class)
     self._event_generator.EmitStreamProviders(
         self._interface,
         self._backend.CustomJSMembers(),
         self._implementation_members_emitter,
         self._library_name)
     self._backend.AddConstructors(
         constructors, factory_provider, factory_constructor_name)
 
+    isElement = False
+    for parent in self._database.Hierarchy(self._interface):
+      if parent.id == 'Element':
+        isElement = True
+    if isElement and self._interface.id != 'Element':
+      self._implementation_members_emitter.Emit(
+          '  /**\n'
+          '   * Constructor instantiated by the DOM when a custom element has been created.\n'
+          '   *\n'
+          '   * This can only be called by subclasses from their created constructor.\n'
+          '   */\n'
+          '  $CLASSNAME.created() : super.created();\n',
+          CLASSNAME=self._interface_type_info.implementation_name())
+
     self._backend.EmitSupportCheck()
 
     merged_interface = self._interface_type_info.merged_interface()
     if merged_interface:
       self._backend.AddMembers(self._database.GetInterface(merged_interface),
         not self._backend.ImplementsMergedMembers())
 
     self._backend.AddMembers(self._interface)
     self._backend.AddSecondaryMembers(self._interface)
     self._event_generator.EmitStreamGetters(
@@ skipping 619 matching lines @@
     for library_name in libraries:
       self._libraries[library_name] = DartLibrary(
           library_name, template_loader, library_type, output_dir)
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)