Roll 50: Updated for push to origin/master.

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 484 matching lines @@
     self._interface = interface
     self._backend = backend
     self._interface_type_info = self._type_registry.TypeInfo(self._interface.id)
     self._library_name = self._renamer.GetLibraryName(self._interface)
     self._metadata = options.metadata
 
   def Generate(self):
     if IsCustomType(self._interface.id):
       pass
     elif 'Callback' in self._interface.ext_attrs:
-      self.GenerateCallback()
+      if len(GetCallbackHandlers(self._interface)) > 0:
+        self.GenerateCallback()
+      else:
+        return
     else:
       self.GenerateInterface()
 
   def GenerateCallback(self):
     """Generates a typedef for the callback interface."""
     typedef_name = self._renamer.RenameInterface(self._interface)
     if not typedef_name:
       return
 
     info = GetCallbackInfo(self._interface)
@@ skipping 379 matching lines @@
 
     has_indexed_getter = self.HasIndexedGetter()
 
     if has_indexed_getter:
       indexed_getter = ('JS("%s%s", "#[#]", this, index)' %
           (self.SecureOutputType(element_type), "|Null" if nullable else ""));
     elif any(op.id == 'getItem' for op in self._interface.operations):
       indexed_getter = 'this.getItem(index)'
     elif any(op.id == 'item' for op in self._interface.operations):
       indexed_getter = 'this.item(index)'
+    else:
+      indexed_getter = False
 
     if indexed_getter:
       self._members_emitter.Emit(
           '\n'
           '  $TYPE operator[](int index) {\n'
           '    if (JS("bool", "# >>> 0 !== # || # >= #", index,\n'
           '        index, index, length))\n'
           '      throw new RangeError.index(index, this);\n'
           '    return $INDEXED_GETTER;\n'
           '  }',
@@ skipping 464 matching lines @@
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def AddTypeEntry(self, library_name, idl_name, dart_name):
     self._libraries[library_name].AddTypeEntry(idl_name, dart_name)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)