def callback_interface_context(callback_interface):
    includes.clear()
    includes.update(CALLBACK_INTERFACE_CPP_INCLUDES)
    return {
        'conditional_string': ext_utilities.conditional_string(callback_interface),
        'cpp_class': callback_interface.name,
        'ext_class': ext_utilities.ext_class_name(callback_interface),
        'header_includes': set(CALLBACK_INTERFACE_H_INCLUDES),
        'methods': [method_context(operation)
                    for operation in callback_interface.operations],
    }
예제 #2
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def method_context(interface, method):
    arguments = method.arguments
    extended_attributes = method.extended_attributes
    idl_type = method.idl_type
    is_static = method.is_static
    name = method.name

    idl_type.add_includes_for_type()
    this_cpp_value = cpp_value(interface, method, len(arguments))

    def function_template():
        if is_static:
            return 'functionTemplate'
        if 'Unforgeable' in extended_attributes:
            return 'instanceTemplate'
        return 'prototypeTemplate'

    is_implemented_in_private_script = 'ImplementedInPrivateScript' in extended_attributes
    if is_implemented_in_private_script:
        includes.add('bindings/core/v8/PrivateScriptRunner.h')
        includes.add('core/frame/LocalFrame.h')
        includes.add('platform/ScriptForbiddenScope.h')

    # [OnlyExposedToPrivateScript]
    is_only_exposed_to_private_script = 'OnlyExposedToPrivateScript' in extended_attributes

    is_call_with_script_arguments = has_extended_attribute_value(
        method, 'CallWith', 'ScriptArguments')
    if is_call_with_script_arguments:
        includes.update([
            'bindings/core/v8/ScriptCallStackFactory.h',
            'core/inspector/ScriptArguments.h'
        ])
    is_call_with_script_state = has_extended_attribute_value(
        method, 'CallWith', 'ScriptState')
    if is_call_with_script_state:
        includes.add('bindings/core/v8/ScriptState.h')
    is_check_security_for_node = 'CheckSecurity' in extended_attributes
    if is_check_security_for_node:
        includes.add('bindings/core/v8/BindingSecurity.h')
    is_custom_element_callbacks = 'CustomElementCallbacks' in extended_attributes
    if is_custom_element_callbacks:
        includes.add('core/dom/custom/CustomElementProcessingStack.h')

    is_do_not_check_security = 'DoNotCheckSecurity' in extended_attributes

    is_check_security_for_frame = (has_extended_attribute_value(
        interface, 'CheckSecurity', 'Frame') and not is_do_not_check_security)

    is_check_security_for_window = (has_extended_attribute_value(
        interface, 'CheckSecurity', 'Window') and not is_do_not_check_security)

    is_raises_exception = 'RaisesException' in extended_attributes

    arguments_need_try_catch = (any(
        argument_needs_try_catch(method, argument) for argument in arguments))

    return {
        'activity_logging_world_list':
        ext_utilities.activity_logging_world_list(method),  # [ActivityLogging]
        'arguments': [
            argument_context(interface, method, argument, index)
            for index, argument in enumerate(arguments)
        ],
        'argument_list':
        ', '.join(arg.name for arg in arguments),
        'argument_declarations_for_private_script':
        argument_declarations_for_private_script(interface, method),
        'arguments_need_try_catch':
        arguments_need_try_catch,
        'conditional_string':
        ext_utilities.conditional_string(method),
        'cpp_type': (ext_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':
        ext_utilities.deprecate_as(method),  # [DeprecateAs]
        'exposed_test':
        ext_utilities.exposed(method, interface),  # [Exposed]
        'function_template':
        function_template(),
        'has_custom_registration':
        is_static or ext_utilities.has_extended_attribute(
            method, CUSTOM_REGISTRATION_EXTENDED_ATTRIBUTES),
        'has_exception_state':
        is_raises_exception or is_check_security_for_frame
        or is_check_security_for_window
        or any(argument for argument in arguments
               if argument.idl_type.name == 'SerializedScriptValue'
               or argument.idl_type.ext_conversion_needs_exception_state),
        '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_check_security_for_frame':
        is_check_security_for_frame,
        'is_check_security_for_node':
        is_check_security_for_node,
        'is_check_security_for_window':
        is_check_security_for_window,
        'is_custom':
        'Custom' in extended_attributes,
        'is_custom_element_callbacks':
        is_custom_element_callbacks,
        'is_do_not_check_security':
        is_do_not_check_security,
        'is_do_not_check_signature':
        'DoNotCheckSignature' in extended_attributes,
        'is_explicit_nullable':
        idl_type.is_explicit_nullable,
        'is_implemented_in_private_script':
        is_implemented_in_private_script,
        'is_partial_interface_member':
        'PartialInterfaceImplementedAs' in extended_attributes,
        'is_per_world_bindings':
        'PerWorldBindings' in extended_attributes,
        'is_raises_exception':
        is_raises_exception,
        'is_read_only':
        'Unforgeable' in extended_attributes,
        'is_static':
        is_static,
        'is_variadic':
        arguments and arguments[-1].is_variadic,
        'measure_as':
        ext_utilities.measure_as(method),  # [MeasureAs]
        'name':
        name,
        'number_of_arguments':
        len(arguments),
        'number_of_required_arguments':
        len([
            argument for argument in arguments
            if not (argument.is_optional or argument.is_variadic)
        ]),
        'number_of_required_or_variadic_arguments':
        len([argument for argument in arguments if not argument.is_optional]),
        'only_exposed_to_private_script':
        is_only_exposed_to_private_script,
        'per_context_enabled_function':
        ext_utilities.per_context_enabled_function_name(
            method),  # [PerContextEnabled]
        'private_script_ext_value_to_local_cpp_value':
        idl_type.ext_value_to_local_cpp_value(extended_attributes,
                                              'v8Value',
                                              'cppValue',
                                              isolate='scriptState->isolate()',
                                              used_in_private_script=True),
        'property_attributes':
        property_attributes(method),
        'runtime_enabled_function':
        ext_utilities.runtime_enabled_function_name(
            method),  # [RuntimeEnabled]
        'should_be_exposed_to_script':
        not (is_implemented_in_private_script
             and is_only_exposed_to_private_script),
        'signature':
        'v8::Local<v8::Signature>()' if is_static or 'DoNotCheckSignature'
        in extended_attributes else 'defaultSignature',
        'union_arguments':
        idl_type.union_arguments,
        'use_local_result':
        use_local_result(method),
        'ext_set_return_value':
        ext_set_return_value(interface.name, method, this_cpp_value),
        'ext_set_return_value_for_main_world':
        ext_set_return_value(interface.name,
                             method,
                             this_cpp_value,
                             for_main_world=True),
        'world_suffixes': ['', 'ForMainWorld'] if 'PerWorldBindings'
        in extended_attributes else [''],  # [PerWorldBindings],
    }
def attribute_context(interface, attribute):
    idl_type = attribute.idl_type
    base_idl_type = idl_type.base_type
    extended_attributes = attribute.extended_attributes

    idl_type.add_includes_for_type()

    # [CheckSecurity]
    is_check_security_for_node = 'CheckSecurity' in extended_attributes
    if is_check_security_for_node:
        includes.add('bindings/core/v8/BindingSecurity.h')
    # [CustomElementCallbacks], [Reflect]
    is_custom_element_callbacks = 'CustomElementCallbacks' in extended_attributes
    is_reflect = 'Reflect' in extended_attributes
    if is_custom_element_callbacks or is_reflect:
        includes.add('core/dom/custom/CustomElementProcessingStack.h')
    # [PerWorldBindings]
    if 'PerWorldBindings' in extended_attributes:
        assert idl_type.is_wrapper_type or 'LogActivity' in extended_attributes, '[PerWorldBindings] should only be used with wrapper types: %s.%s' % (interface.name, attribute.name)
    # [TypeChecking]
    has_type_checking_unrestricted = (
        (has_extended_attribute_value(interface, 'TypeChecking', 'Unrestricted') or
         has_extended_attribute_value(attribute, 'TypeChecking', 'Unrestricted')) and
         idl_type.name in ('Float', 'Double'))
    # [ImplementedInPrivateScript]
    is_implemented_in_private_script = 'ImplementedInPrivateScript' in extended_attributes
    if is_implemented_in_private_script:
        includes.add('bindings/core/v8/PrivateScriptRunner.h')
        includes.add('core/frame/LocalFrame.h')
        includes.add('platform/ScriptForbiddenScope.h')

    # [OnlyExposedToPrivateScript]
    is_only_exposed_to_private_script = 'OnlyExposedToPrivateScript' in extended_attributes

    if (base_idl_type == 'EventHandler' and
        interface.name in ['Window', 'WorkerGlobalScope'] and
        attribute.name == 'onerror'):
        includes.add('bindings/core/v8/V8ErrorHandler.h')

    context = {
        'access_control_list': access_control_list(attribute),
        'activity_logging_world_list_for_getter': ext_utilities.activity_logging_world_list(attribute, 'Getter'),  # [ActivityLogging]
        'activity_logging_world_list_for_setter': ext_utilities.activity_logging_world_list(attribute, 'Setter'),  # [ActivityLogging]
        'activity_logging_world_check': ext_utilities.activity_logging_world_check(attribute),  # [ActivityLogging]
        'argument_cpp_type': idl_type.cpp_type_args(used_as_rvalue_type=True),
        'cached_attribute_validation_method': extended_attributes.get('CachedAttribute'),
        'conditional_string': ext_utilities.conditional_string(attribute),
        'constructor_type': idl_type.constructor_type_name
                            if is_constructor_attribute(attribute) else None,
        'cpp_name': cpp_name(attribute),
        'cpp_type': idl_type.cpp_type,
        'cpp_type_initializer': idl_type.cpp_type_initializer,
        'deprecate_as': ext_utilities.deprecate_as(attribute),  # [DeprecateAs]
        'enum_validation_expression': idl_type.enum_validation_expression,
        'exposed_test': ext_utilities.exposed(attribute, interface),  # [Exposed]
        'has_custom_getter': has_custom_getter(attribute),
        'has_custom_setter': has_custom_setter(attribute),
        'has_type_checking_unrestricted': has_type_checking_unrestricted,
        'idl_type': str(idl_type),  # need trailing [] on array for Dictionary::ConversionContext::setConversionType
        'is_call_with_execution_context': ext_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ExecutionContext'),
        'is_call_with_script_state': ext_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ScriptState'),
        'is_check_security_for_node': is_check_security_for_node,
        'is_custom_element_callbacks': is_custom_element_callbacks,
        'is_expose_js_accessors': 'ExposeJSAccessors' in extended_attributes,
        'is_getter_raises_exception':  # [RaisesException]
            'RaisesException' in extended_attributes and
            extended_attributes['RaisesException'] in (None, 'Getter'),
        'is_implemented_in_private_script': is_implemented_in_private_script,
        'is_initialized_by_event_constructor':
            'InitializedByEventConstructor' in extended_attributes,
        'is_keep_alive_for_gc': is_keep_alive_for_gc(interface, attribute),
        'is_nullable': idl_type.is_nullable,
        'is_explicit_nullable': idl_type.is_explicit_nullable,
        'is_partial_interface_member':
            'PartialInterfaceImplementedAs' in extended_attributes,
        'is_per_world_bindings': 'PerWorldBindings' in extended_attributes,
        'is_read_only': attribute.is_read_only,
        'is_reflect': is_reflect,
        'is_replaceable': 'Replaceable' in attribute.extended_attributes,
        'is_static': attribute.is_static,
        'is_url': 'URL' in extended_attributes,
        'is_unforgeable': 'Unforgeable' in extended_attributes,
        'measure_as': ext_utilities.measure_as(attribute),  # [MeasureAs]
        'name': attribute.name,
        'only_exposed_to_private_script': is_only_exposed_to_private_script,
        'per_context_enabled_function': ext_utilities.per_context_enabled_function_name(attribute),  # [PerContextEnabled]
        'private_script_ext_value_to_local_cpp_value': idl_type.ext_value_to_local_cpp_value(
            extended_attributes, 'v8Value', 'cppValue', isolate='scriptState->isolate()', used_in_private_script=True),
        'property_attributes': property_attributes(attribute),
        'put_forwards': 'PutForwards' in extended_attributes,
        'reflect_empty': extended_attributes.get('ReflectEmpty'),
        'reflect_invalid': extended_attributes.get('ReflectInvalid', ''),
        'reflect_missing': extended_attributes.get('ReflectMissing'),
        'reflect_only': extended_attribute_value_as_list(attribute, 'ReflectOnly'),
        'runtime_enabled_function': ext_utilities.runtime_enabled_function_name(attribute),  # [RuntimeEnabled]
        'setter_callback': setter_callback_name(interface, attribute),
        'should_be_exposed_to_script': not (is_implemented_in_private_script and is_only_exposed_to_private_script),
        'world_suffixes': ['', 'ForMainWorld']
                          if 'PerWorldBindings' in extended_attributes
                          else [''],  # [PerWorldBindings]
    }

    if is_constructor_attribute(attribute):
        constructor_getter_context(interface, attribute, context)
        return context
    if not has_custom_getter(attribute):
        getter_context(interface, attribute, context)
    if (not has_custom_setter(attribute) and
        (not attribute.is_read_only or 'PutForwards' in extended_attributes)):
        setter_context(interface, attribute, context)

    return context
def interface_context(interface):
    includes.clear()
    includes.update(INTERFACE_CPP_INCLUDES)
    header_includes = set(INTERFACE_H_INCLUDES)

    parent_interface = interface.parent
    if parent_interface:
        header_includes.update(ext_types.includes_for_interface(parent_interface))
    extended_attributes = interface.extended_attributes

    is_audio_buffer = inherits_interface(interface.name, 'AudioBuffer')
    if is_audio_buffer:
        includes.add('modules/webaudio/AudioBuffer.h')

    is_document = inherits_interface(interface.name, 'Document')
    if is_document:
        includes.update(['bindings/core/v8/ScriptController.h',
                         'bindings/core/v8/WindowProxy.h',
                         'core/frame/LocalFrame.h'])

    # [ActiveDOMObject]
    is_active_dom_object = 'ActiveDOMObject' in extended_attributes

    # [CheckSecurity]
    is_check_security = 'CheckSecurity' in extended_attributes
    if is_check_security:
        includes.add('bindings/core/v8/BindingSecurity.h')

    # [DependentLifetime]
    is_dependent_lifetime = 'DependentLifetime' in extended_attributes

    # [Iterable]
    iterator_method = None
    if 'Iterable' in extended_attributes:
        iterator_operation = IdlOperation(interface.idl_name)
        iterator_operation.name = 'iterator'
        iterator_operation.idl_type = IdlType('Iterator')
        iterator_operation.extended_attributes['RaisesException'] = None
        iterator_operation.extended_attributes['CallWith'] = 'ScriptState'
        iterator_method = ext_methods.method_context(interface,
                                                    iterator_operation)

    # [MeasureAs]
    is_measure_as = 'MeasureAs' in extended_attributes
    if is_measure_as:
        includes.add('core/frame/UseCounter.h')

    # [SetWrapperReferenceFrom]
    reachable_node_function = extended_attributes.get('SetWrapperReferenceFrom')
    if reachable_node_function:
        includes.update(['bindings/core/v8/V8GCController.h',
                         'core/dom/Element.h'])

    # [SetWrapperReferenceTo]
    set_wrapper_reference_to_list = [{
        'name': argument.name,
        # FIXME: properly should be:
        # 'cpp_type': argument.idl_type.cpp_type_args(raw_type=True),
        # (if type is non-wrapper type like NodeFilter, normally RefPtr)
        # Raw pointers faster though, and NodeFilter hacky anyway.
        'cpp_type': argument.idl_type.implemented_as + '*',
        'idl_type': argument.idl_type,
        'ext_type': ext_types.ext_type(argument.idl_type.name),
    } for argument in extended_attributes.get('SetWrapperReferenceTo', [])]
    for set_wrapper_reference_to in set_wrapper_reference_to_list:
        set_wrapper_reference_to['idl_type'].add_includes_for_type()

    # [NotScriptWrappable]
    is_script_wrappable = 'NotScriptWrappable' not in extended_attributes

    # [SpecialWrapFor]
    if 'SpecialWrapFor' in extended_attributes:
        special_wrap_for = extended_attribute_value_as_list(interface, 'SpecialWrapFor')
    else:
        special_wrap_for = []
    for special_wrap_interface in special_wrap_for:
        ext_types.add_includes_for_interface(special_wrap_interface)

    # [Custom=Wrap], [SetWrapperReferenceFrom]
    has_visit_dom_wrapper = (
        has_extended_attribute_value(interface, 'Custom', 'VisitDOMWrapper') or
        reachable_node_function or
        set_wrapper_reference_to_list)

    this_gc_type = gc_type(interface)

    wrapper_class_id = ('NodeClassId' if inherits_interface(interface.name, 'Node') else 'ObjectClassId')

    context = {
        'conditional_string': conditional_string(interface),  # [Conditional]
        'cpp_class': cpp_name(interface),
        'gc_type': this_gc_type,
        # FIXME: Remove 'EventTarget' special handling, http://crbug.com/383699
        'has_access_check_callbacks': (is_check_security and
                                       interface.name != 'Window' and
                                       interface.name != 'EventTarget'),
        'has_custom_legacy_call_as_function': has_extended_attribute_value(interface, 'Custom', 'LegacyCallAsFunction'),  # [Custom=LegacyCallAsFunction]
        'has_custom_to_v8': has_extended_attribute_value(interface, 'Custom', 'ToV8'),  # [Custom=ToV8]
        'has_custom_wrap': has_extended_attribute_value(interface, 'Custom', 'Wrap'),  # [Custom=Wrap]
        'has_visit_dom_wrapper': has_visit_dom_wrapper,
        'header_includes': header_includes,
        'interface_name': interface.name,
        'is_active_dom_object': is_active_dom_object,
        'is_audio_buffer': is_audio_buffer,
        'is_check_security': is_check_security,
        'is_dependent_lifetime': is_dependent_lifetime,
        'is_document': is_document,
        'is_event_target': inherits_interface(interface.name, 'EventTarget'),
        'is_exception': interface.is_exception,
        'is_node': inherits_interface(interface.name, 'Node'),
        'is_script_wrappable': is_script_wrappable,
        'iterator_method': iterator_method,
        'lifetime': 'Dependent'
            if (has_visit_dom_wrapper or
                is_active_dom_object or
                is_dependent_lifetime)
            else 'Independent',
        'measure_as': ext_utilities.measure_as(interface),  # [MeasureAs]
        'parent_interface': parent_interface,
        'pass_cpp_type': cpp_template_type(
            cpp_ptr_type('PassRefPtr', 'RawPtr', this_gc_type),
            cpp_name(interface)),
        'reachable_node_function': reachable_node_function,
        'runtime_enabled_function': runtime_enabled_function_name(interface),  # [RuntimeEnabled]
        'set_wrapper_reference_to_list': set_wrapper_reference_to_list,
        'special_wrap_for': special_wrap_for,
        'ext_class': ext_utilities.ext_class_name(interface),
        'wrapper_class_id': wrapper_class_id,
    }

    # Constructors
    constructors = [constructor_context(interface, constructor)
                    for constructor in interface.constructors
                    # FIXME: shouldn't put named constructors with constructors
                    # (currently needed for Perl compatibility)
                    # Handle named constructors separately
                    if constructor.name == 'Constructor']
    if len(constructors) > 1:
        context['constructor_overloads'] = overloads_context(constructors)

    # [CustomConstructor]
    custom_constructors = [{  # Only needed for computing interface length
        'number_of_required_arguments':
            number_of_required_arguments(constructor),
    } for constructor in interface.custom_constructors]

    # [EventConstructor]
    has_event_constructor = 'EventConstructor' in extended_attributes
    any_type_attributes = [attribute for attribute in interface.attributes
                           if attribute.idl_type.name == 'Any']
    if has_event_constructor:
        includes.add('bindings/core/v8/Dictionary.h')
        if any_type_attributes:
            includes.add('bindings/core/v8/SerializedScriptValue.h')

    # [NamedConstructor]
    named_constructor = named_constructor_context(interface)

    if (constructors or custom_constructors or has_event_constructor or
        named_constructor):
        includes.add('bindings/core/v8/V8ObjectConstructor.h')
        includes.add('core/frame/LocalDOMWindow.h')

    context.update({
        'any_type_attributes': any_type_attributes,
        'constructors': constructors,
        'has_custom_constructor': bool(custom_constructors),
        'has_event_constructor': has_event_constructor,
        'interface_length':
            interface_length(interface, constructors + custom_constructors),
        'is_constructor_raises_exception': extended_attributes.get('RaisesException') == 'Constructor',  # [RaisesException=Constructor]
        'named_constructor': named_constructor,
    })

    constants = [constant_context(constant) for constant in interface.constants]

    # Constants
    context.update({
        'constants': constants,
        'do_not_check_constants': 'DoNotCheckConstants' in extended_attributes,
        'has_constant_configuration': any(
            not constant['runtime_enabled_function']
            for constant in constants),
    })

    # Attributes
    attributes = [ext_attributes.attribute_context(interface, attribute)
                  for attribute in interface.attributes]
    context.update({
        'attributes': attributes,
        'has_accessors': any(attribute['is_expose_js_accessors'] and attribute['should_be_exposed_to_script'] for attribute in attributes),
        'has_attribute_configuration': any(
             not (attribute['is_expose_js_accessors'] or
                  attribute['is_static'] or
                  attribute['runtime_enabled_function'] or
                  attribute['per_context_enabled_function'])
             and attribute['should_be_exposed_to_script']
             for attribute in attributes),
        'has_conditional_attributes': any(attribute['per_context_enabled_function'] or attribute['exposed_test'] for attribute in attributes),
        'has_constructor_attributes': any(attribute['constructor_type'] for attribute in attributes),
        'has_replaceable_attributes': any(attribute['is_replaceable'] for attribute in attributes),
    })

    # Methods
    methods = [ext_methods.method_context(interface, method)
               for method in interface.operations
               if method.name]  # Skip anonymous special operations (methods)
    compute_method_overloads_context(methods)

    # Stringifier
    if interface.stringifier:
        stringifier = interface.stringifier
        method = IdlOperation(interface.idl_name)
        method.name = 'toString'
        method.idl_type = IdlType('DOMString')
        method.extended_attributes.update(stringifier.extended_attributes)
        if stringifier.attribute:
            method.extended_attributes['ImplementedAs'] = stringifier.attribute.name
        elif stringifier.operation:
            method.extended_attributes['ImplementedAs'] = stringifier.operation.name
        methods.append(ext_methods.method_context(interface, method))

    conditionally_enabled_methods = []
    custom_registration_methods = []
    method_configuration_methods = []

    for method in methods:
        # Skip all but one method in each set of overloaded methods.
        if 'overload_index' in method and 'overloads' not in method:
            continue

        if 'overloads' in method:
            overloads = method['overloads']
            per_context_enabled_function = overloads['per_context_enabled_function_all']
            conditionally_exposed_function = overloads['exposed_test_all']
            runtime_enabled_function = overloads['runtime_enabled_function_all']
            has_custom_registration = overloads['has_custom_registration_all']
        else:
            per_context_enabled_function = method['per_context_enabled_function']
            conditionally_exposed_function = method['exposed_test']
            runtime_enabled_function = method['runtime_enabled_function']
            has_custom_registration = method['has_custom_registration']

        if per_context_enabled_function or conditionally_exposed_function:
            conditionally_enabled_methods.append(method)
            continue
        if runtime_enabled_function or has_custom_registration:
            custom_registration_methods.append(method)
            continue
        if method['should_be_exposed_to_script']:
            method_configuration_methods.append(method)

    for method in methods:
        # The value of the Function object’s “length” property is a Number
        # determined as follows:
        # 1. Let S be the effective overload set for regular operations (if the
        # operation is a regular operation) or for static operations (if the
        # operation is a static operation) with identifier id on interface I and
        # with argument count 0.
        # 2. Return the length of the shortest argument list of the entries in S.
        # FIXME: This calculation doesn't take into account whether runtime
        # enabled overloads are actually enabled, so length may be incorrect.
        # E.g., [RuntimeEnabled=Foo] void f(); void f(long x);
        # should have length 1 if Foo is not enabled, but length 0 if it is.
        method['length'] = (method['overloads']['minarg'] if 'overloads' in method else
                            method['number_of_required_arguments'])

    context.update({
        'conditionally_enabled_methods': conditionally_enabled_methods,
        'custom_registration_methods': custom_registration_methods,
        'has_origin_safe_method_setter': any(
            method['is_check_security_for_frame'] and not method['is_read_only']
            for method in methods),
        'has_private_script': any(attribute['is_implemented_in_private_script'] for attribute in attributes) or
            any(method['is_implemented_in_private_script'] for method in methods),
        'method_configuration_methods': method_configuration_methods,
        'methods': methods,
    })

    context.update({
        'indexed_property_getter': indexed_property_getter(interface),
        'indexed_property_setter': indexed_property_setter(interface),
        'indexed_property_deleter': indexed_property_deleter(interface),
        'is_override_builtins': 'OverrideBuiltins' in extended_attributes,
        'named_property_getter': named_property_getter(interface),
        'named_property_setter': named_property_setter(interface),
        'named_property_deleter': named_property_deleter(interface),
    })

    return context
def method_context(interface, method):
    arguments = method.arguments
    extended_attributes = method.extended_attributes
    idl_type = method.idl_type
    is_static = method.is_static
    name = method.name

    idl_type.add_includes_for_type()
    this_cpp_value = cpp_value(interface, method, len(arguments))

    def function_template():
        if is_static:
            return 'functionTemplate'
        if 'Unforgeable' in extended_attributes:
            return 'instanceTemplate'
        return 'prototypeTemplate'

    is_implemented_in_private_script = 'ImplementedInPrivateScript' in extended_attributes
    if is_implemented_in_private_script:
        includes.add('bindings/core/v8/PrivateScriptRunner.h')
        includes.add('core/frame/LocalFrame.h')
        includes.add('platform/ScriptForbiddenScope.h')

    # [OnlyExposedToPrivateScript]
    is_only_exposed_to_private_script = 'OnlyExposedToPrivateScript' in extended_attributes

    is_call_with_script_arguments = has_extended_attribute_value(method, 'CallWith', 'ScriptArguments')
    if is_call_with_script_arguments:
        includes.update(['bindings/core/v8/ScriptCallStackFactory.h',
                         'core/inspector/ScriptArguments.h'])
    is_call_with_script_state = has_extended_attribute_value(method, 'CallWith', 'ScriptState')
    if is_call_with_script_state:
        includes.add('bindings/core/v8/ScriptState.h')
    is_check_security_for_node = 'CheckSecurity' in extended_attributes
    if is_check_security_for_node:
        includes.add('bindings/core/v8/BindingSecurity.h')
    is_custom_element_callbacks = 'CustomElementCallbacks' in extended_attributes
    if is_custom_element_callbacks:
        includes.add('core/dom/custom/CustomElementProcessingStack.h')

    is_do_not_check_security = 'DoNotCheckSecurity' in extended_attributes

    is_check_security_for_frame = (
        has_extended_attribute_value(interface, 'CheckSecurity', 'Frame') and
        not is_do_not_check_security)

    is_check_security_for_window = (
        has_extended_attribute_value(interface, 'CheckSecurity', 'Window') and
        not is_do_not_check_security)

    is_raises_exception = 'RaisesException' in extended_attributes

    arguments_need_try_catch = (
        any(argument_needs_try_catch(method, argument)
            for argument in arguments))

    return {
        'activity_logging_world_list': ext_utilities.activity_logging_world_list(method),  # [ActivityLogging]
        'arguments': [argument_context(interface, method, argument, index)
                      for index, argument in enumerate(arguments)],
        'argument_list': ', '.join(arg.name for arg in arguments),
        'argument_declarations_for_private_script':
            argument_declarations_for_private_script(interface, method),
        'arguments_need_try_catch': arguments_need_try_catch,
        'conditional_string': ext_utilities.conditional_string(method),
        'cpp_type': (ext_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': ext_utilities.deprecate_as(method),  # [DeprecateAs]
        'exposed_test': ext_utilities.exposed(method, interface),  # [Exposed]
        'function_template': function_template(),
        'has_custom_registration': is_static or
            ext_utilities.has_extended_attribute(
                method, CUSTOM_REGISTRATION_EXTENDED_ATTRIBUTES),
        'has_exception_state':
            is_raises_exception or
            is_check_security_for_frame or
            is_check_security_for_window or
            any(argument for argument in arguments
                if argument.idl_type.name == 'SerializedScriptValue' or
                   argument.idl_type.ext_conversion_needs_exception_state),
        '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_check_security_for_frame': is_check_security_for_frame,
        'is_check_security_for_node': is_check_security_for_node,
        'is_check_security_for_window': is_check_security_for_window,
        'is_custom': 'Custom' in extended_attributes,
        'is_custom_element_callbacks': is_custom_element_callbacks,
        'is_do_not_check_security': is_do_not_check_security,
        'is_do_not_check_signature': 'DoNotCheckSignature' in extended_attributes,
        'is_explicit_nullable': idl_type.is_explicit_nullable,
        'is_implemented_in_private_script': is_implemented_in_private_script,
        'is_partial_interface_member':
            'PartialInterfaceImplementedAs' in extended_attributes,
        'is_per_world_bindings': 'PerWorldBindings' in extended_attributes,
        'is_raises_exception': is_raises_exception,
        'is_read_only': 'Unforgeable' in extended_attributes,
        'is_static': is_static,
        'is_variadic': arguments and arguments[-1].is_variadic,
        'measure_as': ext_utilities.measure_as(method),  # [MeasureAs]
        'name': name,
        'number_of_arguments': len(arguments),
        'number_of_required_arguments': len([
            argument for argument in arguments
            if not (argument.is_optional or argument.is_variadic)]),
        'number_of_required_or_variadic_arguments': len([
            argument for argument in arguments
            if not argument.is_optional]),
        'only_exposed_to_private_script': is_only_exposed_to_private_script,
        'per_context_enabled_function': ext_utilities.per_context_enabled_function_name(method),  # [PerContextEnabled]
        'private_script_ext_value_to_local_cpp_value': idl_type.ext_value_to_local_cpp_value(
            extended_attributes, 'v8Value', 'cppValue', isolate='scriptState->isolate()', used_in_private_script=True),
        'property_attributes': property_attributes(method),
        'runtime_enabled_function': ext_utilities.runtime_enabled_function_name(method),  # [RuntimeEnabled]
        'should_be_exposed_to_script': not (is_implemented_in_private_script and is_only_exposed_to_private_script),
        'signature': 'v8::Local<v8::Signature>()' if is_static or 'DoNotCheckSignature' in extended_attributes else 'defaultSignature',
        'union_arguments': idl_type.union_arguments,
        'use_local_result': use_local_result(method),
        'ext_set_return_value': ext_set_return_value(interface.name, method, this_cpp_value),
        'ext_set_return_value_for_main_world': ext_set_return_value(interface.name, method, this_cpp_value, for_main_world=True),
        'world_suffixes': ['', 'ForMainWorld'] if 'PerWorldBindings' in extended_attributes else [''],  # [PerWorldBindings],
    }
def attribute_context(interface, attribute):
    idl_type = attribute.idl_type
    base_idl_type = idl_type.base_type
    extended_attributes = attribute.extended_attributes

    idl_type.add_includes_for_type()

    # [CheckSecurity]
    is_check_security_for_node = 'CheckSecurity' in extended_attributes
    if is_check_security_for_node:
        includes.add('bindings/core/v8/BindingSecurity.h')
    # [CustomElementCallbacks], [Reflect]
    is_custom_element_callbacks = 'CustomElementCallbacks' in extended_attributes
    is_reflect = 'Reflect' in extended_attributes
    if is_custom_element_callbacks or is_reflect:
        includes.add('core/dom/custom/CustomElementProcessingStack.h')
    # [PerWorldBindings]
    if 'PerWorldBindings' in extended_attributes:
        assert idl_type.is_wrapper_type or 'LogActivity' in extended_attributes, '[PerWorldBindings] should only be used with wrapper types: %s.%s' % (
            interface.name, attribute.name)
    # [TypeChecking]
    has_type_checking_unrestricted = ((
        has_extended_attribute_value(interface, 'TypeChecking', 'Unrestricted')
        or has_extended_attribute_value(attribute, 'TypeChecking',
                                        'Unrestricted'))
                                      and idl_type.name in ('Float', 'Double'))
    # [ImplementedInPrivateScript]
    is_implemented_in_private_script = 'ImplementedInPrivateScript' in extended_attributes
    if is_implemented_in_private_script:
        includes.add('bindings/core/v8/PrivateScriptRunner.h')
        includes.add('core/frame/LocalFrame.h')
        includes.add('platform/ScriptForbiddenScope.h')

    # [OnlyExposedToPrivateScript]
    is_only_exposed_to_private_script = 'OnlyExposedToPrivateScript' in extended_attributes

    if (base_idl_type == 'EventHandler'
            and interface.name in ['Window', 'WorkerGlobalScope']
            and attribute.name == 'onerror'):
        includes.add('bindings/core/v8/V8ErrorHandler.h')

    context = {
        'access_control_list': access_control_list(attribute),
        'activity_logging_world_list_for_getter': ext_utilities.activity_logging_world_list(attribute, 'Getter'),  # [ActivityLogging]
        'activity_logging_world_list_for_setter': ext_utilities.activity_logging_world_list(attribute, 'Setter'),  # [ActivityLogging]
        'activity_logging_world_check': ext_utilities.activity_logging_world_check(attribute),  # [ActivityLogging]
        'argument_cpp_type': idl_type.cpp_type_args(used_as_rvalue_type=True),
        'cached_attribute_validation_method': extended_attributes.get('CachedAttribute'),
        'conditional_string': ext_utilities.conditional_string(attribute),
        'constructor_type': idl_type.constructor_type_name
                            if is_constructor_attribute(attribute) else None,
        'cpp_name': cpp_name(attribute),
        'cpp_type': idl_type.cpp_type,
        'cpp_type_initializer': idl_type.cpp_type_initializer,
        'deprecate_as': ext_utilities.deprecate_as(attribute),  # [DeprecateAs]
        'enum_validation_expression': idl_type.enum_validation_expression,
        'exposed_test': ext_utilities.exposed(attribute, interface),  # [Exposed]
        'has_custom_getter': has_custom_getter(attribute),
        'has_custom_setter': has_custom_setter(attribute),
        'has_type_checking_unrestricted': has_type_checking_unrestricted,
        'idl_type': str(idl_type),  # need trailing [] on array for Dictionary::ConversionContext::setConversionType
        'is_call_with_execution_context': ext_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ExecutionContext'),
        'is_call_with_script_state': ext_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ScriptState'),
        'is_check_security_for_node': is_check_security_for_node,
        'is_custom_element_callbacks': is_custom_element_callbacks,
        'is_expose_js_accessors': 'ExposeJSAccessors' in extended_attributes,
        'is_getter_raises_exception':  # [RaisesException]
            'RaisesException' in extended_attributes and
            extended_attributes['RaisesException'] in (None, 'Getter'),
        'is_implemented_in_private_script': is_implemented_in_private_script,
        'is_initialized_by_event_constructor':
            'InitializedByEventConstructor' in extended_attributes,
        'is_keep_alive_for_gc': is_keep_alive_for_gc(interface, attribute),
        'is_nullable': idl_type.is_nullable,
        'is_explicit_nullable': idl_type.is_explicit_nullable,
        'is_partial_interface_member':
            'PartialInterfaceImplementedAs' in extended_attributes,
        'is_per_world_bindings': 'PerWorldBindings' in extended_attributes,
        'is_read_only': attribute.is_read_only,
        'is_reflect': is_reflect,
        'is_replaceable': 'Replaceable' in attribute.extended_attributes,
        'is_static': attribute.is_static,
        'is_url': 'URL' in extended_attributes,
        'is_unforgeable': 'Unforgeable' in extended_attributes,
        'measure_as': ext_utilities.measure_as(attribute),  # [MeasureAs]
        'name': attribute.name,
        'only_exposed_to_private_script': is_only_exposed_to_private_script,
        'per_context_enabled_function': ext_utilities.per_context_enabled_function_name(attribute),  # [PerContextEnabled]
        'private_script_ext_value_to_local_cpp_value': idl_type.ext_value_to_local_cpp_value(
            extended_attributes, 'v8Value', 'cppValue', isolate='scriptState->isolate()', used_in_private_script=True),
        'property_attributes': property_attributes(attribute),
        'put_forwards': 'PutForwards' in extended_attributes,
        'reflect_empty': extended_attributes.get('ReflectEmpty'),
        'reflect_invalid': extended_attributes.get('ReflectInvalid', ''),
        'reflect_missing': extended_attributes.get('ReflectMissing'),
        'reflect_only': extended_attribute_value_as_list(attribute, 'ReflectOnly'),
        'runtime_enabled_function': ext_utilities.runtime_enabled_function_name(attribute),  # [RuntimeEnabled]
        'setter_callback': setter_callback_name(interface, attribute),
        'should_be_exposed_to_script': not (is_implemented_in_private_script and is_only_exposed_to_private_script),
        'world_suffixes': ['', 'ForMainWorld']
                          if 'PerWorldBindings' in extended_attributes
                          else [''],  # [PerWorldBindings]
    }

    if is_constructor_attribute(attribute):
        constructor_getter_context(interface, attribute, context)
        return context
    if not has_custom_getter(attribute):
        getter_context(interface, attribute, context)
    if (not has_custom_setter(attribute) and
        (not attribute.is_read_only or 'PutForwards' in extended_attributes)):
        setter_context(interface, attribute, context)

    return context