bindings: Ignores the last undefined arguments when counting the args.

third_party/WebKit/Source/bindings/scripts/v8_methods.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # 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
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 100 matching lines @@
     is_post_message = 'PostMessage' in extended_attributes
     if is_post_message:
         includes.add('bindings/core/v8/SerializedScriptValueFactory.h')
         includes.add('core/dom/DOMArrayBuffer.h')
         includes.add('core/dom/MessagePort.h')
         includes.add('core/frame/ImageBitmap.h')
 
     if 'LenientThis' in extended_attributes:
         raise Exception('[LenientThis] is not supported for operations.')
 
+    argument_contexts = [
+        argument_context(interface, method, argument, index, is_visible=is_visible)
+        for index, argument in enumerate(arguments)]
+
     return {
         'activity_logging_world_list': v8_utilities.activity_logging_world_list(method),  # [ActivityLogging]
-        'arguments': [argument_context(interface, method, argument, index, is_visible=is_visible)
-                      for index, argument in enumerate(arguments)],
+        'arguments': argument_contexts,
         'argument_declarations_for_private_script':
             argument_declarations_for_private_script(interface, method),
         'conditional_string': v8_utilities.conditional_string(method),
         'cpp_type': (v8_types.cpp_template_type('Nullable', idl_type.cpp_type)
                      if idl_type.is_explicit_nullable else idl_type.cpp_type),
         'cpp_value': this_cpp_value,
         'cpp_type_initializer': idl_type.cpp_type_initializer,
         'custom_registration_extended_attributes':
             CUSTOM_REGISTRATION_EXTENDED_ATTRIBUTES.intersection(
                 extended_attributes.iterkeys()),
         'deprecate_as': v8_utilities.deprecate_as(method),  # [DeprecateAs]
         'exposed_test': v8_utilities.exposed(method, interface),  # [Exposed]
         # TODO(yukishiino): Retire has_custom_registration flag.  Should be
         # replaced with V8DOMConfiguration::PropertyLocationConfiguration.
         'has_custom_registration':
             v8_utilities.has_extended_attribute(
                 method, CUSTOM_REGISTRATION_EXTENDED_ATTRIBUTES),
         'has_exception_state':
             is_raises_exception or
             is_check_security_for_receiver or
             any(argument for argument in arguments
                 if (argument.idl_type.name == 'SerializedScriptValue' or
                     argument_conversion_needs_exception_state(method, argument))),
+        'has_optional_argument_without_default_value':
+            any(True for argument_context in argument_contexts
+                if argument_context['is_optional_without_default_value']),
         'idl_type': idl_type.base_type,
         'is_call_with_execution_context': has_extended_attribute_value(method, 'CallWith', 'ExecutionContext'),
         'is_call_with_script_arguments': is_call_with_script_arguments,
         'is_call_with_script_state': is_call_with_script_state,
         'is_call_with_this_value': is_call_with_this_value,
         'is_check_security_for_receiver': is_check_security_for_receiver,
         'is_check_security_for_return_value': is_check_security_for_return_value,
         'is_custom': 'Custom' in extended_attributes and
             not (is_custom_call_prologue or is_custom_call_epilogue),
         'is_custom_call_prologue': is_custom_call_prologue,
@@ skipping 54 matching lines @@
 
     if ('ImplementedInPrivateScript' in extended_attributes and
             not idl_type.is_wrapper_type and
             not idl_type.is_basic_type):
         raise Exception('Private scripts supports only primitive types and DOM wrappers.')
 
     set_default_value = argument.set_default_value
     this_cpp_type = idl_type.cpp_type_args(extended_attributes=extended_attributes,
                                            raw_type=True,
                                            used_as_variadic_argument=argument.is_variadic)
-    return {
+    context = {
         'cpp_type': (
             v8_types.cpp_template_type('Nullable', this_cpp_type)
             if idl_type.is_explicit_nullable and not argument.is_variadic
             else this_cpp_type),
         'cpp_value': this_cpp_value,
         # FIXME: check that the default value's type is compatible with the argument's
         'set_default_value': set_default_value,
         'enum_type': idl_type.enum_type,
         'enum_values': idl_type.enum_values,
         'handle': '%sHandle' % argument.name,
@@ skipping 16 matching lines @@
         'is_wrapper_type': idl_type.is_wrapper_type,
         'name': argument.name,
         'private_script_cpp_value_to_v8_value': idl_type.cpp_value_to_v8_value(
             argument.name, isolate='scriptState->isolate()',
             creation_context='scriptState->context()->Global()'),
         'use_permissive_dictionary_conversion': 'PermissiveDictionaryConversion' in extended_attributes,
         'v8_set_return_value': v8_set_return_value(interface.name, method, this_cpp_value),
         'v8_set_return_value_for_main_world': v8_set_return_value(interface.name, method, this_cpp_value, for_main_world=True),
         'v8_value_to_local_cpp_value': v8_value_to_local_cpp_value(method, argument, index),
     }
+    context.update({
+        'is_optional_without_default_value':
+            context['is_optional'] and
+            not context['has_default'] and
+            not context['is_dictionary'] and
+            not context['is_callback_interface'],
+    })
+    return context
 
 
 def argument_declarations_for_private_script(interface, method):
     argument_declarations = ['LocalFrame* frame']
     argument_declarations.append('%s* holderImpl' % interface.name)
     argument_declarations.extend(['%s %s' % (argument.idl_type.cpp_type_args(
         used_as_rvalue_type=True), argument.name) for argument in method.arguments])
     if method.idl_type.name != 'void':
         argument_declarations.append('%s* %s' % (method.idl_type.cpp_type, 'result'))
     return argument_declarations
@@ skipping 190 matching lines @@
     return method.idl_type and method.idl_type.name == 'Promise'
 
 IdlOperation.returns_promise = property(method_returns_promise)
 
 
 def argument_conversion_needs_exception_state(method, argument):
     idl_type = argument.idl_type
     return (idl_type.v8_conversion_needs_exception_state or
             argument.is_variadic or
             (method.returns_promise and idl_type.is_string_type))