Support WebIDL's ExtendedAttributeIdentList in the Blink parser

Source/bindings/scripts/generate_global_constructors.py

 #!/usr/bin/python
 #
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generates interface properties on global objects.
 
 Concretely these are implemented as "constructor attributes", meaning
 "attributes whose name ends with Constructor" (special-cased by code generator),
@@ skipping 68 matching lines @@
     # http://heycam.github.io/webidl/#es-interfaces
     if (is_callback_interface_from_idl(idl_file_contents) or
         'NoInterfaceObject' in extended_attributes):
         return
 
     # The [Exposed] extended attribute MUST take an identifier list. Each
     # identifier in the list MUST be a global name. An interface or interface
     # member the extended attribute applies to will be exposed only on objects
     # associated with ECMAScript global environments whose global object
     # implements an interface that has a matching global name.
-    # FIXME: In spec names are comma-separated, but that makes parsing very
-    # difficult (https://www.w3.org/Bugs/Public/show_bug.cgi?id=24959).
-    exposed_global_names = extended_attributes.get('Exposed', 'Window').split('&')
+    exposed_global_names = extended_attributes.get('Exposed', 'Window').strip('()').split(',')
     new_constructors_list = generate_global_constructors_list(interface_name, extended_attributes)
     for exposed_global_name in exposed_global_names:
         global_name_to_constructors[exposed_global_name].extend(new_constructors_list)
 
 
 def generate_global_constructors_list(interface_name, extended_attributes):
     extended_attributes_list = [
             name + '=' + extended_attributes[name]
             for name in 'Conditional', 'PerContextEnabled', 'RuntimeEnabled'
             if name in extended_attributes]
@@ skipping 73 matching lines @@
         constructors = interface_name_to_constructors(interface_name)
         write_global_constructors_partial_interface(
             interface_name,
             idl_filename,
             constructors,
             options.write_file_only_if_changed)
 
 
 if __name__ == '__main__':
     sys.exit(main())