Introduce [Exposed(Arguments)] in IDL code generator.

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.
     exposed_global_names = extended_attributes.get('Exposed', 'Window').strip('()').split(',')

[Jens Widell, 2014/12/09 08:25:12]

Does this really work now? It doesn't look like
get_interface_extended_attributes_from_idl() can quite cope with extended
attributes using the Name(Arguments) syntax.

Can you update a test IDL file to use the new syntax for an interface's Exposed?

[yhirano, 2014/12/09 08:42:09]

Yeah, I fixed this script in another
CL(https://codereview.chromium.org/771323004/).
I added Exposed(Arguments) in TestInterface2.idl, but it doesn't have any
effect.

[Jens Widell, 2014/12/09 09:20:47]

It would make sense to move that fix over from that CL to this, I think.

+    # Blink has Exposed(Arguments) form. In the form, each argument type
+    # represents the global context.
+    exposed_global_names = [name.split(' ')[0] for name in exposed_global_names]
+
     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())