IDL: Support extended attributes on iterable<>, maplike<> and setlike<>

Source/bindings/scripts/v8_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 # coding=utf-8
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 324 matching lines @@
     # [Iterable], iterable<>, maplike<> and setlike<>
     iterator_method = None
     # FIXME: support Iterable in partial interfaces. However, we don't
     # need to support iterator overloads between interface and
     # partial interface definitions.
     # http://heycam.github.io/webidl/#idl-overloading
     if (not interface.is_partial
         and (interface.iterable or interface.maplike or interface.setlike
              or 'Iterable' in extended_attributes)):
 
+        used_extended_attributes = {}
+
+        if interface.iterable:
+            used_extended_attributes.update(interface.iterable.extended_attributes)
+        elif interface.maplike:
+            used_extended_attributes.update(interface.maplike.extended_attributes)
+        elif interface.setlike:
+            used_extended_attributes.update(interface.setlike.extended_attributes)
+
+        if 'RaisesException' in used_extended_attributes:
+            raise ValueError('[RaisesException] is implied for iterable<>/maplike<>/setlike<>')
+        if 'CallWith' in used_extended_attributes:
+            raise ValueError('[CallWith=ScriptState] is implied for iterable<>/maplike<>/setlike<>')
+
+        used_extended_attributes.update({
+            'RaisesException': None,
+            'CallWith': 'ScriptState',
+        })
+
         def generated_iterator_method(name):
             return generated_method(
                 return_type=IdlType('Iterator'),
                 name=name,
-                extended_attributes={'RaisesException': None, 'CallWith': 'ScriptState'})
+                extended_attributes=used_extended_attributes)
 
         iterator_method = generated_iterator_method('iterator')
 
         if interface.iterable:
             methods.extend([
                 generated_iterator_method('keys'),
                 generated_iterator_method('values'),
                 generated_iterator_method('entries'),
             ])
 
@@ skipping 927 matching lines @@
         deleter = next(
             method
             for method in interface.operations
             if ('deleter' in method.specials and
                 len(method.arguments) == 1 and
                 str(method.arguments[0].idl_type) == 'DOMString'))
     except StopIteration:
         return None
 
     return property_deleter(deleter)