IDL compiler: delete Perl compiler, remove unstable/ directory

Source/bindings/scripts/unstable/v8_interface.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
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Generate template values for an interface.
-
-FIXME: Not currently used in build.
-This is a rewrite of the Perl IDL compiler in Python, but is not complete.
-Once it is complete, we will switch all IDL files over to Python at once.
-Until then, please work on the Perl IDL compiler.
-For details, see bug http://crbug.com/239771
-"""
-
-import v8_attributes
-from v8_globals import includes
-import v8_methods
-import v8_types
-from v8_types import inherits_interface, is_interface_type
-import v8_utilities
-from v8_utilities import capitalize, conditional_string, cpp_name, has_extended_attribute_value, runtime_enabled_function_name
-
-
-INTERFACE_H_INCLUDES = frozenset([
-    'bindings/v8/V8Binding.h',
-    'bindings/v8/V8DOMWrapper.h',
-    'bindings/v8/WrapperTypeInfo.h',
-    'heap/Handle.h',
-])
-INTERFACE_CPP_INCLUDES = frozenset([
-    'RuntimeEnabledFeatures.h',
-    'bindings/v8/ExceptionState.h',
-    'bindings/v8/V8DOMConfiguration.h',
-    'bindings/v8/V8ObjectConstructor.h',
-    'core/dom/ContextFeatures.h',
-    'core/dom/Document.h',
-    'platform/TraceEvent.h',
-    'wtf/GetPtr.h',  # FIXME: remove if can eliminate WTF::getPtr
-    'wtf/RefPtr.h',
-])
-
-
-def generate_interface(interface):
-    includes.clear()
-    includes.update(INTERFACE_CPP_INCLUDES)
-    header_includes = set(INTERFACE_H_INCLUDES)
-
-    parent_interface = interface.parent
-    if parent_interface:
-        header_includes.update(v8_types.includes_for_type(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/v8/ScriptController.h',
-                         'bindings/v8/V8WindowShell.h',
-                         'core/frame/LocalFrame.h'])
-
-    # [CheckSecurity]
-    is_check_security = 'CheckSecurity' in extended_attributes
-    if is_check_security:
-        includes.add('bindings/v8/BindingSecurity.h')
-
-    # [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')
-    reachable_node_reference_function = extended_attributes.get('SetWrapperReferenceFromReference')
-    if reachable_node_function or reachable_node_reference_function:
-        includes.update(['bindings/v8/V8GCController.h',
-                         'core/dom/Element.h'])
-
-    # [SetWrapperReferenceTo]
-    set_wrapper_reference_to_list = [{
-        'name': argument.name,
-        # FIXME: properly should be:
-        # 'cpp_type': v8_types.cpp_type(argument.idl_type, used_as_argument=True),
-        # (if type is non-wrapper type like NodeFilter, normally RefPtr)
-        # Raw pointers faster though, and NodeFilter hacky anyway.
-        'cpp_type': v8_types.implemented_as(argument.idl_type) + '*',
-        'idl_type': argument.idl_type,
-        'v8_type': v8_types.v8_type(argument.idl_type),
-    } for argument in extended_attributes.get('SetWrapperReferenceTo', [])]
-    for set_wrapper_reference_to in set_wrapper_reference_to_list:
-        v8_types.add_includes_for_type(set_wrapper_reference_to['idl_type'])
-
-    # [SpecialWrapFor]
-    if 'SpecialWrapFor' in extended_attributes:
-        special_wrap_for = extended_attributes['SpecialWrapFor'].split('|')
-    else:
-        special_wrap_for = []
-    for special_wrap_interface in special_wrap_for:
-        v8_types.add_includes_for_type(special_wrap_interface)
-
-    # [WillBeGarbageCollected]
-    is_will_be_garbage_collected = 'WillBeGarbageCollected' in extended_attributes
-
-    template_contents = {
-        'conditional_string': conditional_string(interface),  # [Conditional]
-        'cpp_class': cpp_name(interface),
-        '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': (
-            # [Custom=Wrap], [SetWrapperReferenceFrom]
-            has_extended_attribute_value(interface, 'Custom', 'VisitDOMWrapper') or
-            reachable_node_function or
-            reachable_node_reference_function or
-            set_wrapper_reference_to_list),
-        'header_includes': header_includes,
-        'interface_name': interface.name,
-        'is_active_dom_object': 'ActiveDOMObject' in extended_attributes,  # [ActiveDOMObject]
-        'is_audio_buffer': is_audio_buffer,
-        'is_check_security': is_check_security,
-        'is_dependent_lifetime': 'DependentLifetime' in extended_attributes,  # [DependentLifetime]
-        'is_document': is_document,
-        'is_event_target': inherits_interface(interface.name, 'EventTarget'),
-        'is_exception': interface.is_exception,
-        'is_will_be_garbage_collected': is_will_be_garbage_collected,
-        'is_node': inherits_interface(interface.name, 'Node'),
-        'measure_as': v8_utilities.measure_as(interface),  # [MeasureAs]
-        'parent_interface': parent_interface,
-        'pass_ref_ptr': 'PassRefPtrWillBeRawPtr'
-                        if is_will_be_garbage_collected else 'PassRefPtr',
-        'reachable_node_function': reachable_node_function,
-        'reachable_node_reference_function': reachable_node_reference_function,
-        'ref_ptr': 'RefPtrWillBeRawPtr'
-                   if is_will_be_garbage_collected else 'RefPtr',
-        '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,
-        'v8_class': v8_utilities.v8_class_name(interface),
-    }
-
-    # Constructors
-    constructors = [generate_constructor(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']
-    generate_constructor_overloads(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 == 'any']
-    if has_event_constructor:
-        includes.add('bindings/v8/Dictionary.h')
-        if any_type_attributes:
-            includes.add('bindings/v8/SerializedScriptValue.h')
-
-    # [NamedConstructor]
-    named_constructor = generate_named_constructor(interface)
-
-    if (constructors or custom_constructors or has_event_constructor or
-        named_constructor):
-        includes.add('bindings/v8/V8ObjectConstructor.h')
-
-    template_contents.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_call_with_document': has_extended_attribute_value(
-            interface, 'ConstructorCallWith', 'Document'),  # [ConstructorCallWith=Document]
-        'is_constructor_call_with_execution_context': has_extended_attribute_value(
-            interface, 'ConstructorCallWith', 'ExecutionContext'),  # [ConstructorCallWith=ExeuctionContext]
-        'is_constructor_raises_exception': extended_attributes.get('RaisesException') == 'Constructor',  # [RaisesException=Constructor]
-        'named_constructor': named_constructor,
-    })
-
-    # Constants
-    template_contents.update({
-        'constants': [generate_constant(constant) for constant in interface.constants],
-        'do_not_check_constants': 'DoNotCheckConstants' in extended_attributes,
-    })
-
-    # Attributes
-    attributes = [v8_attributes.generate_attribute(interface, attribute)
-                  for attribute in interface.attributes]
-    template_contents.update({
-        'attributes': attributes,
-        'has_accessors': any(attribute['is_expose_js_accessors'] 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'])
-             for attribute in attributes),
-        'has_constructor_attributes': any(attribute['constructor_type'] for attribute in attributes),
-        'has_per_context_enabled_attributes': any(attribute['per_context_enabled_function'] for attribute in attributes),
-        'has_replaceable_attributes': any(attribute['is_replaceable'] for attribute in attributes),
-    })
-
-    # Methods
-    methods = [v8_methods.generate_method(interface, method)
-               for method in interface.operations
-               if method.name]  # Skip anonymous special operations (methods)
-    generate_overloads(methods)
-    for method in methods:
-        method['do_generate_method_configuration'] = (
-            method['do_not_check_signature'] and
-            not method['per_context_enabled_function'] and
-            # For overloaded methods, only generate one accessor
-            ('overload_index' not in method or method['overload_index'] == 1))
-
-    template_contents.update({
-        'has_origin_safe_method_setter': any(
-            method['is_check_security_for_frame'] and not method['is_read_only']
-            for method in methods),
-        'has_method_configuration': any(method['do_generate_method_configuration'] for method in methods),
-        'has_per_context_enabled_methods': any(method['per_context_enabled_function'] for method in methods),
-        'methods': methods,
-    })
-
-    template_contents.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 template_contents
-
-
-# [DeprecateAs], [Reflect], [RuntimeEnabled]
-def generate_constant(constant):
-    # (Blink-only) string literals are unquoted in tokenizer, must be re-quoted
-    # in C++.
-    if constant.idl_type == 'DOMString':
-        value = '"%s"' % constant.value
-    else:
-        value = constant.value
-
-    extended_attributes = constant.extended_attributes
-    return {
-        'cpp_class': extended_attributes.get('ImplementedBy'),
-        'name': constant.name,
-        # FIXME: use 'reflected_name' as correct 'name'
-        'reflected_name': extended_attributes.get('Reflect', constant.name),
-        'runtime_enabled_function': runtime_enabled_function_name(constant),
-        'value': value,
-    }
-
-
-################################################################################
-# Overloads
-################################################################################
-
-def generate_overloads(methods):
-    generate_overloads_by_type(methods, is_static=False)  # Regular methods
-    generate_overloads_by_type(methods, is_static=True)
-
-
-def generate_overloads_by_type(methods, is_static):
-    # Generates |overloads| template values and modifies |methods| in place;
-    # |is_static| flag used (instead of partitioning list in 2) because need to
-    # iterate over original list of methods to modify in place
-    method_counts = {}
-    for method in methods:
-        if method['is_static'] != is_static:
-            continue
-        name = method['name']
-        method_counts.setdefault(name, 0)
-        method_counts[name] += 1
-
-    # Filter to only methods that are actually overloaded
-    overloaded_method_counts = dict((name, count)
-                                    for name, count in method_counts.iteritems()
-                                    if count > 1)
-
-    # Add overload information only to overloaded methods, so template code can
-    # easily verify if a function is overloaded
-    method_overloads = {}
-    for method in methods:
-        name = method['name']
-        if (method['is_static'] != is_static or
-            name not in overloaded_method_counts):
-            continue
-        # Overload index includes self, so first append, then compute index
-        method_overloads.setdefault(name, []).append(method)
-        method.update({
-            'overload_index': len(method_overloads[name]),
-            'overload_resolution_expression': overload_resolution_expression(method),
-        })
-
-    # Resolution function is generated after last overloaded function;
-    # package necessary information into |method.overloads| for that method.
-    for method in methods:
-        if (method['is_static'] != is_static or
-            'overload_index' not in method):
-            continue
-        name = method['name']
-        if method['overload_index'] != overloaded_method_counts[name]:
-            continue
-        overloads = method_overloads[name]
-        minimum_number_of_required_arguments = min(
-            overload['number_of_required_arguments']
-            for overload in overloads)
-        method['overloads'] = {
-            'has_exception_state': bool(minimum_number_of_required_arguments),
-            'methods': overloads,
-            'minimum_number_of_required_arguments': minimum_number_of_required_arguments,
-            'name': name,
-        }
-
-
-def overload_resolution_expression(method):
-    # Expression is an OR of ANDs: each term in the OR corresponds to a
-    # possible argument count for a given method, with type checks.
-    # FIXME: Blink's overload resolution algorithm is incorrect, per:
-    # Implement WebIDL overload resolution algorithm.
-    # https://code.google.com/p/chromium/issues/detail?id=293561
-    #
-    # Currently if distinguishing non-primitive type from primitive type,
-    # (e.g., sequence<DOMString> from DOMString or Dictionary from double)
-    # the method with a non-primitive type argument must appear *first* in the
-    # IDL file, since we're not adding a check to primitive types.
-    # FIXME: Once fixed, check IDLs, as usually want methods with primitive
-    # types to appear first (style-wise).
-    #
-    # Properly:
-    # 1. Compute effective overload set.
-    # 2. First check type list length.
-    # 3. If multiple entries for given length, compute distinguishing argument
-    #    index and have check for that type.
-    arguments = method['arguments']
-    overload_checks = [overload_check_expression(method, index)
-                       # check *omitting* optional arguments at |index| and up:
-                       # index 0 => argument_count 0 (no arguments)
-                       # index 1 => argument_count 1 (index 0 argument only)
-                       for index, argument in enumerate(arguments)
-                       if argument['is_optional']]
-    # FIXME: this is wrong if a method has optional arguments and a variadic
-    # one, though there are not yet any examples of this
-    if not method['is_variadic']:
-        # Includes all optional arguments (len = last index + 1)
-        overload_checks.append(overload_check_expression(method, len(arguments)))
-    return ' || '.join('(%s)' % check for check in overload_checks)
-
-
-def overload_check_expression(method, argument_count):
-    overload_checks = ['info.Length() == %s' % argument_count]
-    arguments = method['arguments'][:argument_count]
-    overload_checks.extend(overload_check_argument(index, argument)
-                           for index, argument in
-                           enumerate(arguments))
-    return ' && '.join('(%s)' % check for check in overload_checks if check)
-
-
-def overload_check_argument(index, argument):
-    def null_or_optional_check():
-        # If undefined is passed for an optional argument, the argument should
-        # be treated as missing; otherwise undefined is not allowed.
-        if argument['is_nullable']:
-            if argument['is_optional']:
-                return 'isUndefinedOrNull(%s)'
-            return '%s->IsNull()'
-        if argument['is_optional']:
-            return '%s->IsUndefined()'
-        return None
-
-    cpp_value = 'info[%s]' % index
-    idl_type = argument['idl_type']
-    # FIXME: proper type checking, sharing code with attributes and methods
-    if idl_type == 'DOMString' and argument['is_strict_type_checking']:
-        return ' || '.join(['isUndefinedOrNull(%s)' % cpp_value,
-                            '%s->IsString()' % cpp_value,
-                            '%s->IsObject()' % cpp_value])
-    if v8_types.array_or_sequence_type(idl_type):
-        return '%s->IsArray()' % cpp_value
-    if v8_types.is_callback_interface(idl_type):
-        return ' || '.join(['%s->IsNull()' % cpp_value,
-                            '%s->IsFunction()' % cpp_value])
-    if v8_types.is_wrapper_type(idl_type):
-        type_check = 'V8{idl_type}::hasInstance({cpp_value}, info.GetIsolate())'.format(idl_type=idl_type, cpp_value=cpp_value)
-        if argument['is_nullable']:
-            type_check = ' || '.join(['%s->IsNull()' % cpp_value, type_check])
-        return type_check
-    if is_interface_type(idl_type):
-        # Non-wrapper types are just objects: we don't distinguish type
-        # We only allow undefined for non-wrapper types (notably Dictionary),
-        # as we need it for optional Dictionary arguments, but we don't want to
-        # change behavior of existing bindings for other types.
-        type_check = '%s->IsObject()' % cpp_value
-        added_check_template = null_or_optional_check()
-        if added_check_template:
-            type_check = ' || '.join([added_check_template % cpp_value,
-                                      type_check])
-        return type_check
-    return None
-
-
-################################################################################
-# Constructors
-################################################################################
-
-# [Constructor]
-def generate_constructor(interface, constructor):
-    return {
-        'argument_list': constructor_argument_list(interface, constructor),
-        'arguments': [constructor_argument(argument, index)
-                      for index, argument in enumerate(constructor.arguments)],
-        'has_exception_state':
-            # [RaisesException=Constructor]
-            interface.extended_attributes.get('RaisesException') == 'Constructor' or
-            any(argument for argument in constructor.arguments
-                if argument.idl_type == 'SerializedScriptValue' or
-                   v8_types.is_integer_type(argument.idl_type)),
-        'is_constructor': True,
-        'is_variadic': False,  # Required for overload resolution
-        'number_of_required_arguments':
-            number_of_required_arguments(constructor),
-    }
-
-
-def constructor_argument_list(interface, constructor):
-    arguments = []
-    # [ConstructorCallWith=ExecutionContext]
-    if has_extended_attribute_value(interface, 'ConstructorCallWith', 'ExecutionContext'):
-        arguments.append('context')
-    # [ConstructorCallWith=Document]
-    if has_extended_attribute_value(interface, 'ConstructorCallWith', 'Document'):
-        arguments.append('document')
-
-    arguments.extend([argument.name for argument in constructor.arguments])
-
-    # [RaisesException=Constructor]
-    if interface.extended_attributes.get('RaisesException') == 'Constructor':
-        arguments.append('exceptionState')
-
-    return arguments
-
-
-def constructor_argument(argument, index):
-    return {
-        'has_default': 'Default' in argument.extended_attributes,
-        'idl_type': argument.idl_type,
-        'index': index,
-        'is_nullable': False,  # Required for overload resolution
-        'is_optional': argument.is_optional,
-        'is_strict_type_checking': False,  # Required for overload resolution
-        'name': argument.name,
-        'v8_value_to_local_cpp_value':
-            v8_methods.v8_value_to_local_cpp_value(argument, index),
-    }
-
-
-def generate_constructor_overloads(constructors):
-    if len(constructors) <= 1:
-        return
-    for overload_index, constructor in enumerate(constructors):
-        constructor.update({
-            'overload_index': overload_index + 1,
-            'overload_resolution_expression':
-                overload_resolution_expression(constructor),
-        })
-
-
-# [NamedConstructor]
-def generate_named_constructor(interface):
-    extended_attributes = interface.extended_attributes
-    if 'NamedConstructor' not in extended_attributes:
-        return None
-    # FIXME: parser should return named constructor separately;
-    # included in constructors (and only name stored in extended attribute)
-    # for Perl compatibility
-    idl_constructor = interface.constructors[0]
-    constructor = generate_constructor(interface, idl_constructor)
-    constructor['argument_list'].insert(0, '*document')
-    constructor['name'] = extended_attributes['NamedConstructor']
-    return constructor
-
-
-def number_of_required_arguments(constructor):
-    return len([argument for argument in constructor.arguments
-                if not argument.is_optional])
-
-
-def interface_length(interface, constructors):
-    # Docs: http://heycam.github.io/webidl/#es-interface-call
-    if 'EventConstructor' in interface.extended_attributes:
-        return 1
-    if not constructors:
-        return 0
-    return min(constructor['number_of_required_arguments']
-               for constructor in constructors)
-
-
-################################################################################
-# Special operations (methods)
-# http://heycam.github.io/webidl/#idl-special-operations
-################################################################################
-
-def property_getter(getter, cpp_arguments):
-    def is_null_expression(idl_type):
-        if v8_types.is_union_type(idl_type):
-            return ' && '.join('!result%sEnabled' % i
-                               for i, _ in
-                               enumerate(idl_type.union_member_types))
-        if idl_type == 'DOMString':
-            return 'result.isNull()'
-        if is_interface_type(idl_type):
-            return '!result'
-        return ''
-
-    idl_type = getter.idl_type
-    extended_attributes = getter.extended_attributes
-    is_raises_exception = 'RaisesException' in extended_attributes
-
-    if v8_types.is_union_type(idl_type):
-        release = [v8_types.is_interface_type(union_member_type)
-                   for union_member_type in idl_type.union_member_types]
-    else:
-        release = v8_types.is_interface_type(idl_type)
-
-    # FIXME: make more generic, so can use v8_methods.cpp_value
-    cpp_method_name = 'imp->%s' % cpp_name(getter)
-
-    if is_raises_exception:
-        cpp_arguments.append('exceptionState')
-    this_union_arguments = v8_methods.union_arguments(idl_type)
-    if this_union_arguments:
-        cpp_arguments.extend(this_union_arguments)
-
-    cpp_value = '%s(%s)' % (cpp_method_name, ', '.join(cpp_arguments))
-
-    return {
-        'cpp_type': v8_types.cpp_type(idl_type),
-        'cpp_value': cpp_value,
-        'is_custom':
-            'Custom' in extended_attributes and
-            (not extended_attributes['Custom'] or
-             has_extended_attribute_value(getter, 'Custom', 'PropertyGetter')),
-        'is_custom_property_enumerator': has_extended_attribute_value(
-            getter, 'Custom', 'PropertyEnumerator'),
-        'is_custom_property_query': has_extended_attribute_value(
-            getter, 'Custom', 'PropertyQuery'),
-        'is_enumerable': 'NotEnumerable' not in extended_attributes,
-        'is_null_expression': is_null_expression(idl_type),
-        'is_raises_exception': is_raises_exception,
-        'name': cpp_name(getter),
-        'union_arguments': v8_methods.union_arguments(idl_type),
-        'v8_set_return_value': v8_types.v8_set_return_value(idl_type, 'result', extended_attributes=extended_attributes, script_wrappable='imp', release=release),
-    }
-
-
-def property_setter(setter):
-    idl_type = setter.arguments[1].idl_type
-    extended_attributes = setter.extended_attributes
-    is_raises_exception = 'RaisesException' in extended_attributes
-    return {
-        'has_strict_type_checking':
-            'StrictTypeChecking' in extended_attributes and
-            v8_types.is_wrapper_type(idl_type),
-        'idl_type': idl_type,
-        'is_custom': 'Custom' in extended_attributes,
-        'has_exception_state': is_raises_exception or
-                               v8_types.is_integer_type(idl_type),
-        'is_raises_exception': is_raises_exception,
-        'name': cpp_name(setter),
-        'v8_value_to_local_cpp_value': v8_types.v8_value_to_local_cpp_value(
-            idl_type, extended_attributes, 'jsValue', 'propertyValue'),
-    }
-
-
-def property_deleter(deleter):
-    idl_type = deleter.idl_type
-    if idl_type != 'boolean':
-        raise Exception(
-            'Only deleters with boolean type are allowed, but type is "%s"' %
-            idl_type)
-    extended_attributes = deleter.extended_attributes
-    return {
-        'is_custom': 'Custom' in extended_attributes,
-        'is_raises_exception': 'RaisesException' in extended_attributes,
-        'name': cpp_name(deleter),
-    }
-
-
-################################################################################
-# Indexed properties
-# http://heycam.github.io/webidl/#idl-indexed-properties
-################################################################################
-
-def indexed_property_getter(interface):
-    try:
-        # Find indexed property getter, if present; has form:
-        # getter TYPE [OPTIONAL_IDENTIFIER](unsigned long ARG1)
-        getter = next(
-            method
-            for method in interface.operations
-            if ('getter' in method.specials and
-                len(method.arguments) == 1 and
-                method.arguments[0].idl_type == 'unsigned long'))
-    except StopIteration:
-        return None
-
-    return property_getter(getter, ['index'])
-
-
-def indexed_property_setter(interface):
-    try:
-        # Find indexed property setter, if present; has form:
-        # setter RETURN_TYPE [OPTIONAL_IDENTIFIER](unsigned long ARG1, ARG_TYPE ARG2)
-        setter = next(
-            method
-            for method in interface.operations
-            if ('setter' in method.specials and
-                len(method.arguments) == 2 and
-                method.arguments[0].idl_type == 'unsigned long'))
-    except StopIteration:
-        return None
-
-    return property_setter(setter)
-
-
-def indexed_property_deleter(interface):
-    try:
-        # Find indexed property deleter, if present; has form:
-        # deleter TYPE [OPTIONAL_IDENTIFIER](unsigned long ARG)
-        deleter = next(
-            method
-            for method in interface.operations
-            if ('deleter' in method.specials and
-                len(method.arguments) == 1 and
-                method.arguments[0].idl_type == 'unsigned long'))
-    except StopIteration:
-        return None
-
-    return property_deleter(deleter)
-
-
-################################################################################
-# Named properties
-# http://heycam.github.io/webidl/#idl-named-properties
-################################################################################
-
-def named_property_getter(interface):
-    try:
-        # Find named property getter, if present; has form:
-        # getter TYPE [OPTIONAL_IDENTIFIER](DOMString ARG1)
-        getter = next(
-            method
-            for method in interface.operations
-            if ('getter' in method.specials and
-                len(method.arguments) == 1 and
-                method.arguments[0].idl_type == 'DOMString'))
-    except StopIteration:
-        return None
-
-    getter.name = getter.name or 'anonymousNamedGetter'
-    return property_getter(getter, ['propertyName'])
-
-
-def named_property_setter(interface):
-    try:
-        # Find named property setter, if present; has form:
-        # setter RETURN_TYPE [OPTIONAL_IDENTIFIER](DOMString ARG1, ARG_TYPE ARG2)
-        setter = next(
-            method
-            for method in interface.operations
-            if ('setter' in method.specials and
-                len(method.arguments) == 2 and
-                method.arguments[0].idl_type == 'DOMString'))
-    except StopIteration:
-        return None
-
-    return property_setter(setter)
-
-
-def named_property_deleter(interface):
-    try:
-        # Find named property deleter, if present; has form:
-        # deleter TYPE [OPTIONAL_IDENTIFIER](DOMString ARG)
-        deleter = next(
-            method
-            for method in interface.operations
-            if ('deleter' in method.specials and
-                len(method.arguments) == 1 and
-                method.arguments[0].idl_type == 'DOMString'))
-    except StopIteration:
-        return None
-
-    return property_deleter(deleter)