Remove lib/dom directory!

lib/dom/scripts/systemnative.py

Index: lib/dom/scripts/systemnative.py
===================================================================
--- lib/dom/scripts/systemnative.py	(revision 12066)
+++ lib/dom/scripts/systemnative.py	(working copy)
@@ -1,969 +0,0 @@
-#!/usr/bin/python
-# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-"""This module provides shared functionality for the systems to generate
-native binding from the IDL database."""
-
-import emitter
-import os
-import systembase
-from generator import *
-
-
-class NativeImplementationSystem(systembase.System):
-
-  def __init__(self, options, auxiliary_dir):
-    super(NativeImplementationSystem, self).__init__(options)
-    self._auxiliary_dir = auxiliary_dir
-    self._cpp_header_files = []
-    self._cpp_impl_files = []
-
-  def ImplementationGenerator(self, interface):
-    return NativeImplementationGenerator(self, interface)
-
-  def ProcessCallback(self, interface, info):
-    self._interface = interface
-
-    if IsPureInterface(self._interface.id):
-      return None
-
-    cpp_impl_includes = set()
-    cpp_header_handlers_emitter = emitter.Emitter()
-    cpp_impl_handlers_emitter = emitter.Emitter()
-    class_name = 'Dart%s' % self._interface.id
-    for operation in interface.operations:
-      if operation.type.id == 'void':
-        return_prefix = ''
-        error_return = ''
-      else:
-        return_prefix = 'return '
-        error_return = ' false'
-
-      parameters = []
-      arguments = []
-      conversion_includes = []
-      for argument in operation.arguments:
-        argument_type_info = self._type_registry.TypeInfo(argument.type.id)
-        parameters.append('%s %s' % (argument_type_info.parameter_type(),
-                                     argument.id))
-        arguments.append(argument_type_info.to_dart_conversion(argument.id))
-        conversion_includes.extend(argument_type_info.conversion_includes())
-
-      native_return_type = self._type_registry.TypeInfo(operation.type.id).native_type()
-      cpp_header_handlers_emitter.Emit(
-          '\n'
-          '    virtual $TYPE handleEvent($PARAMETERS);\n',
-          TYPE=native_return_type, PARAMETERS=', '.join(parameters))
-
-      if 'Custom' in operation.ext_attrs:
-        continue
-
-      cpp_impl_includes |= set(conversion_includes)
-      arguments_declaration = 'Dart_Handle arguments[] = { %s }' % ', '.join(arguments)
-      if not len(arguments):
-        arguments_declaration = 'Dart_Handle* arguments = 0'
-      cpp_impl_handlers_emitter.Emit(
-          '\n'
-          '$TYPE $CLASS_NAME::handleEvent($PARAMETERS)\n'
-          '{\n'
-          '    if (!m_callback.isolate()->isAlive())\n'
-          '        return$ERROR_RETURN;\n'
-          '    DartIsolate::Scope scope(m_callback.isolate());\n'
-          '    DartApiScope apiScope;\n'
-          '    $ARGUMENTS_DECLARATION;\n'
-          '    $(RETURN_PREFIX)m_callback.handleEvent($ARGUMENT_COUNT, arguments);\n'
-          '}\n',
-          TYPE=native_return_type,
-          CLASS_NAME=class_name,
-          PARAMETERS=', '.join(parameters),
-          ERROR_RETURN=error_return,
-          RETURN_PREFIX=return_prefix,
-          ARGUMENTS_DECLARATION=arguments_declaration,
-          ARGUMENT_COUNT=len(arguments))
-
-    cpp_header_path = self._FilePathForCppHeader(self._interface.id)
-    cpp_header_emitter = self._emitters.FileEmitter(cpp_header_path)
-    cpp_header_emitter.Emit(
-        self._templates.Load('cpp_callback_header.template'),
-        INTERFACE=self._interface.id,
-        HANDLERS=cpp_header_handlers_emitter.Fragments())
-
-    cpp_impl_path = self._FilePathForCppImplementation(self._interface.id)
-    self._cpp_impl_files.append(cpp_impl_path)
-    cpp_impl_emitter = self._emitters.FileEmitter(cpp_impl_path)
-    cpp_impl_emitter.Emit(
-        self._templates.Load('cpp_callback_implementation.template'),
-        INCLUDES=_GenerateCPPIncludes(cpp_impl_includes),
-        INTERFACE=self._interface.id,
-        HANDLERS=cpp_impl_handlers_emitter.Fragments())
-
-  def GenerateLibraries(self, interface_files):
-    # Generate dart:html library.
-    auxiliary_dir = os.path.relpath(self._auxiliary_dir, self._output_dir)
-    self._GenerateLibFile(
-        'html_dartium.darttemplate',
-        os.path.join(self._output_dir, 'html_dartium.dart'),
-        interface_files,
-        AUXILIARY_DIR=systembase.MassagePath(auxiliary_dir))
-
-    # Generate DartDerivedSourcesXX.cpp.
-    partitions = 20 # FIXME: this should be configurable.
-    sources_count = len(self._cpp_impl_files)
-    for i in range(0, partitions):
-      derived_sources_path = os.path.join(self._output_dir,
-          'DartDerivedSources%02i.cpp' % (i + 1))
-
-      includes_emitter = emitter.Emitter()
-      for impl_file in self._cpp_impl_files[i::partitions]:
-          path = os.path.relpath(impl_file, os.path.dirname(derived_sources_path))
-          includes_emitter.Emit('#include "$PATH"\n', PATH=path)
-
-      derived_sources_emitter = self._emitters.FileEmitter(derived_sources_path)
-      derived_sources_emitter.Emit(
-          self._templates.Load('cpp_derived_sources.template'),
-          INCLUDES=includes_emitter.Fragments())
-
-    # Generate DartResolver.cpp.
-    cpp_resolver_path = os.path.join(self._output_dir, 'DartResolver.cpp')
-
-    includes_emitter = emitter.Emitter()
-    resolver_body_emitter = emitter.Emitter()
-    for file in self._cpp_header_files:
-        path = os.path.relpath(file, os.path.dirname(cpp_resolver_path))
-        includes_emitter.Emit('#include "$PATH"\n', PATH=path)
-        resolver_body_emitter.Emit(
-            '    if (Dart_NativeFunction func = $CLASS_NAME::resolver(name, argumentCount))\n'
-            '        return func;\n',
-            CLASS_NAME=os.path.splitext(os.path.basename(path))[0])
-
-    cpp_resolver_emitter = self._emitters.FileEmitter(cpp_resolver_path)
-    cpp_resolver_emitter.Emit(
-        self._templates.Load('cpp_resolver.template'),
-        INCLUDES=includes_emitter.Fragments(),
-        RESOLVER_BODY=resolver_body_emitter.Fragments())
-
-  def Finish(self):
-    pass
-
-  def _FilePathForCppHeader(self, interface_name):
-    return os.path.join(self._output_dir, 'cpp', 'Dart%s.h' % interface_name)
-
-  def _FilePathForCppImplementation(self, interface_name):
-    return os.path.join(self._output_dir, 'cpp', 'Dart%s.cpp' % interface_name)
-
-
-class NativeImplementationGenerator(systembase.BaseGenerator):
-  """Generates Dart implementation for one DOM IDL interface."""
-
-  def __init__(self, system, interface):
-    """Generates Dart and C++ code for the given interface.
-
-    Args:
-      system: The NativeImplementationSystem.
-      interface: an IDLInterface instance. It is assumed that all types have
-          been converted to Dart types (e.g. int, String), unless they are in
-          the same package as the interface.
-    """
-    super(NativeImplementationGenerator, self).__init__(
-        system._database, interface)
-    self._system = system
-    self._current_secondary_parent = None
-    self._html_interface_name = system._renamer.RenameInterface(self._interface)
-
-  def HasImplementation(self):
-    return not IsPureInterface(self._interface.id)
-
-  def ImplementationClassName(self):
-    return self._ImplClassName(self._interface.id)
-
-  def FilePathForDartImplementation(self):
-    return os.path.join(self._system._output_dir, 'dart',
-                        '%sImplementation.dart' % self._interface.id)
-
-  def FilePathForDartFactoryProviderImplementation(self):
-    file_name = '%sFactoryProviderImplementation.dart' % self._interface.id
-    return os.path.join(self._system._output_dir, 'dart', file_name)
-
-  def FilePathForDartElementsFactoryProviderImplementation(self):
-    return os.path.join(self._system._output_dir, 'dart',
-                        '_ElementsFactoryProviderImplementation.dart')
-
-  def SetImplementationEmitter(self, implementation_emitter):
-    self._dart_impl_emitter = implementation_emitter
-
-  def ImplementsMergedMembers(self):
-    # We could not add merged functions to implementation class because
-    # underlying c++ object doesn't implement them. Merged functions are
-    # generated on merged interface implementation instead.
-    return False
-
-  def StartInterface(self):
-    # Create emitters for c++ implementation.
-    if self.HasImplementation():
-      cpp_header_path = self._system._FilePathForCppHeader(self._interface.id)
-      self._system._cpp_header_files.append(cpp_header_path)
-      self._cpp_header_emitter = self._system._emitters.FileEmitter(cpp_header_path)
-      cpp_impl_path = self._system._FilePathForCppImplementation(self._interface.id)
-      self._system._cpp_impl_files.append(cpp_impl_path)
-      self._cpp_impl_emitter = self._system._emitters.FileEmitter(cpp_impl_path)
-    else:
-      self._cpp_header_emitter = emitter.Emitter()
-      self._cpp_impl_emitter = emitter.Emitter()
-
-    self._interface_type_info = self._TypeInfo(self._interface.id)
-    self._members_emitter = emitter.Emitter()
-    self._cpp_declarations_emitter = emitter.Emitter()
-    self._cpp_impl_includes = set()
-    self._cpp_definitions_emitter = emitter.Emitter()
-    self._cpp_resolver_emitter = emitter.Emitter()
-
-    self._GenerateConstructors()
-    return self._members_emitter
-
-  def _GenerateConstructors(self):
-    if not self._IsConstructable():
-      return
-
-    # TODO(antonm): currently we don't have information about number of arguments expected by
-    # the constructor, so name only dispatch.
-    self._cpp_resolver_emitter.Emit(
-        '    if (name == "$(INTERFACE_NAME)_constructor_Callback")\n'
-        '        return Dart$(INTERFACE_NAME)Internal::constructorCallback;\n',
-        INTERFACE_NAME=self._interface.id)
-
-
-    constructor_info = AnalyzeConstructor(self._interface)
-
-    ext_attrs = self._interface.ext_attrs
-
-    if 'CustomConstructor' in ext_attrs:
-      # We have a custom implementation for it.
-      self._cpp_declarations_emitter.Emit(
-          '\n'
-          'void constructorCallback(Dart_NativeArguments);\n')
-      return
-
-    if ext_attrs.get('ConstructorTemplate') == 'TypedArray':
-      self._cpp_impl_includes.add('"DartArrayBufferViewCustom.h"');
-      self._cpp_definitions_emitter.Emit(
-        '\n'
-        'static void constructorCallback(Dart_NativeArguments args)\n'
-        '{\n'
-        '    WebCore::DartArrayBufferViewInternal::constructWebGLArray<Dart$(INTERFACE_NAME)>(args);\n'
-        '}\n',
-        INTERFACE_NAME=self._interface.id);
-      return
-
-    create_function = 'create'
-    if 'NamedConstructor' in ext_attrs:
-      create_function = 'createForJSConstructor'
-    function_expression = '%s::%s' % (self._interface_type_info.native_type(), create_function)
-    self._GenerateNativeCallback(
-        'constructorCallback',
-        False,
-        function_expression,
-        self._interface,
-        constructor_info.idl_args,
-        self._interface.id,
-        'ConstructorRaisesException' in ext_attrs)
-
-  def _ImplClassName(self, interface_name):
-    return '_%sImpl' % interface_name
-
-  def _BaseClassName(self):
-    root_class = 'NativeFieldWrapperClass1'
-
-    if not self._interface.parents:
-      return root_class
-
-    supertype = self._interface.parents[0].type.id
-
-    if IsPureInterface(supertype):    # The class is a root.
-      return root_class
-
-    # FIXME: We're currently injecting List<..> and EventTarget as
-    # supertypes in dart.idl. We should annotate/preserve as
-    # attributes instead.  For now, this hack lets the self._interfaces
-    # inherit, but not the classes.
-    # List methods are injected in AddIndexer.
-    if IsDartListType(supertype) or IsDartCollectionType(supertype):
-      return root_class
-
-    return self._ImplClassName(supertype)
-
-  ATTRIBUTES_OF_CONSTRUCTABLE = set([
-    'CustomConstructor',
-    'V8CustomConstructor',
-    'Constructor',
-    'NamedConstructor'])
-
-  def _IsConstructable(self):
-    ext_attrs = self._interface.ext_attrs
-
-    if self.ATTRIBUTES_OF_CONSTRUCTABLE & set(ext_attrs):
-      return True
-
-    # FIXME: support other types of ConstructorTemplate.
-    if ext_attrs.get('ConstructorTemplate') == 'TypedArray':
-      return True
-
-    return False
-
-  def EmitFactoryProvider(self, constructor_info, factory_provider, emitter):
-    template_file = 'factoryprovider_%s.darttemplate' % self._html_interface_name
-    template = self._system._templates.TryLoad(template_file)
-    if not template:
-      template = self._system._templates.Load('factoryprovider.darttemplate')
-
-    native_binding = '%s_constructor_Callback' % self._interface.id
-    emitter.Emit(
-        template,
-        FACTORYPROVIDER=factory_provider,
-        INTERFACE=self._html_interface_name,
-        PARAMETERS=constructor_info.ParametersImplementationDeclaration(self._DartType),
-        ARGUMENTS=constructor_info.ParametersAsArgumentList(),
-        NATIVE_NAME=native_binding)
-
-  def FinishInterface(self):
-    template = None
-    if self._html_interface_name == self._interface.id or not self._database.HasInterface(self._html_interface_name):
-      template_file = 'impl_%s.darttemplate' % self._html_interface_name
-      template = self._system._templates.TryLoad(template_file)
-    if not template:
-      template = self._system._templates.Load('dart_implementation.darttemplate')
-
-    class_name = self._ImplClassName(self._interface.id)
-    members_emitter = self._dart_impl_emitter.Emit(
-        template,
-        CLASSNAME=class_name,
-        EXTENDS=' extends ' + self._BaseClassName(),
-        IMPLEMENTS=' implements ' + self._html_interface_name,
-        NATIVESPEC='')
-    members_emitter.Emit(''.join(self._members_emitter.Fragments()))
-
-    self._GenerateCppHeader()
-
-    self._cpp_impl_emitter.Emit(
-        self._system._templates.Load('cpp_implementation.template'),
-        INTERFACE=self._interface.id,
-        INCLUDES=_GenerateCPPIncludes(self._cpp_impl_includes),
-        CALLBACKS=self._cpp_definitions_emitter.Fragments(),
-        RESOLVER=self._cpp_resolver_emitter.Fragments(),
-        DART_IMPLEMENTATION_CLASS=class_name)
-
-  def _GenerateCppHeader(self):
-    to_native_emitter = emitter.Emitter()
-    if self._interface_type_info.custom_to_native():
-      to_native_emitter.Emit(
-          '    static PassRefPtr<NativeType> toNative(Dart_Handle handle, Dart_Handle& exception);\n')
-    else:
-      to_native_emitter.Emit(
-          '    static NativeType* toNative(Dart_Handle handle, Dart_Handle& exception)\n'
-          '    {\n'
-          '        return DartDOMWrapper::unwrapDartWrapper<Dart$INTERFACE>(handle, exception);\n'
-          '    }\n',
-          INTERFACE=self._interface.id)
-
-    to_dart_emitter = emitter.Emitter()
-
-    ext_attrs = self._interface.ext_attrs
-
-    if ('CustomToJS' in ext_attrs or
-        ('CustomToJSObject' in ext_attrs and 'TypedArray' not in ext_attrs) or
-        'PureInterface' in ext_attrs or
-        'CPPPureInterface' in ext_attrs or
-        self._interface_type_info.custom_to_dart()):
-      to_dart_emitter.Emit(
-          '    static Dart_Handle toDart(NativeType* value);\n')
-    else:
-      to_dart_emitter.Emit(
-          '    static Dart_Handle toDart(NativeType* value)\n'
-          '    {\n'
-          '        return DartDOMWrapper::toDart<Dart$(INTERFACE)>(value);\n'
-          '    }\n',
-          INTERFACE=self._interface.id)
-
-    webcore_includes = _GenerateCPPIncludes(self._interface_type_info.webcore_includes())
-
-    is_node_test = lambda interface: interface.id == 'Node'
-    is_active_test = lambda interface: 'ActiveDOMObject' in interface.ext_attrs
-    is_event_target_test = lambda interface: 'EventTarget' in interface.ext_attrs
-    def TypeCheckHelper(test):
-      return 'true' if any(map(test, self._database.Hierarchy(self._interface))) else 'false'
-
-    self._cpp_header_emitter.Emit(
-        self._system._templates.Load('cpp_header.template'),
-        INTERFACE=self._interface.id,
-        WEBCORE_INCLUDES=webcore_includes,
-        WEBCORE_CLASS_NAME=self._interface_type_info.native_type(),
-        DECLARATIONS=self._cpp_declarations_emitter.Fragments(),
-        IS_NODE=TypeCheckHelper(is_node_test),
-        IS_ACTIVE=TypeCheckHelper(is_active_test),
-        IS_EVENT_TARGET=TypeCheckHelper(is_event_target_test),
-        TO_NATIVE=to_native_emitter.Fragments(),
-        TO_DART=to_dart_emitter.Fragments())
-
-  def AddAttribute(self, attribute, html_name, read_only):
-    if 'CheckSecurityForNode' in attribute.ext_attrs:
-      # FIXME: exclude from interface as well.
-      return
-
-    self._AddGetter(attribute, html_name)
-    if not read_only:
-      self._AddSetter(attribute, html_name)
-
-  def _AddGetter(self, attr, html_name):
-    type_info = self._TypeInfo(attr.type.id)
-    dart_declaration = '%s get %s()' % (self._DartType(attr.type.id), html_name)
-    is_custom = 'Custom' in attr.ext_attrs or 'CustomGetter' in attr.ext_attrs
-    cpp_callback_name = self._GenerateNativeBinding(attr.id, 1,
-        dart_declaration, 'Getter', is_custom)
-    if is_custom:
-      return
-
-    if 'Reflect' in attr.ext_attrs:
-      webcore_function_name = self._TypeInfo(attr.type.id).webcore_getter_name()
-      if 'URL' in attr.ext_attrs:
-        if 'NonEmpty' in attr.ext_attrs:
-          webcore_function_name = 'getNonEmptyURLAttribute'
-        else:
-          webcore_function_name = 'getURLAttribute'
-    elif 'ImplementedAs' in attr.ext_attrs:
-      webcore_function_name = attr.ext_attrs['ImplementedAs']
-    else:
-      if attr.id == 'operator':
-        webcore_function_name = '_operator'
-      elif attr.id == 'target' and attr.type.id == 'SVGAnimatedString':
-        webcore_function_name = 'svgTarget'
-      else:
-        webcore_function_name = _ToWebKitName(attr.id)
-      if attr.type.id.startswith('SVGAnimated'):
-        webcore_function_name += 'Animated'
-
-    function_expression = self._GenerateWebCoreFunctionExpression(webcore_function_name, attr)
-    self._GenerateNativeCallback(
-        cpp_callback_name,
-        True,
-        function_expression,
-        attr,
-        [],
-        attr.type.id,
-        attr.get_raises)
-
-  def _AddSetter(self, attr, html_name):
-    type_info = self._TypeInfo(attr.type.id)
-    dart_declaration = 'void set %s(%s)' % (html_name, self._DartType(attr.type.id))
-    is_custom = set(['Custom', 'CustomSetter', 'V8CustomSetter']) & set(attr.ext_attrs)
-    cpp_callback_name = self._GenerateNativeBinding(attr.id, 2,
-        dart_declaration, 'Setter', is_custom)
-    if is_custom:
-      return
-
-    if 'Reflect' in attr.ext_attrs:
-      webcore_function_name = self._TypeInfo(attr.type.id).webcore_setter_name()
-    else:
-      webcore_function_name = re.sub(r'^(xml(?=[A-Z])|\w)',
-                                     lambda s: s.group(1).upper(),
-                                     attr.id)
-      webcore_function_name = 'set%s' % webcore_function_name
-      if attr.type.id.startswith('SVGAnimated'):
-        webcore_function_name += 'Animated'
-
-    function_expression = self._GenerateWebCoreFunctionExpression(webcore_function_name, attr)
-    self._GenerateNativeCallback(
-        cpp_callback_name,
-        True,
-        function_expression,
-        attr,
-        [attr],
-        'void',
-        attr.set_raises)
-
-  def AddIndexer(self, element_type):
-    """Adds all the methods required to complete implementation of List."""
-    # We would like to simply inherit the implementation of everything except
-    # get length(), [], and maybe []=.  It is possible to extend from a base
-    # array implementation class only when there is no other implementation
-    # inheritance.  There might be no implementation inheritance other than
-    # DOMBaseWrapper for many classes, but there might be some where the
-    # array-ness is introduced by a non-root interface:
-    #
-    #   interface Y extends X, List<T> ...
-    #
-    # In the non-root case we have to choose between:
-    #
-    #   class YImpl extends XImpl { add List<T> methods; }
-    #
-    # and
-    #
-    #   class YImpl extends ListBase<T> { copies of transitive XImpl methods; }
-    #
-    dart_element_type = self._DartType(element_type)
-    if self._HasNativeIndexGetter():
-      self._EmitNativeIndexGetter(dart_element_type)
-    else:
-      self._members_emitter.Emit(
-          '\n'
-          '  $TYPE operator[](int index) native "$(INTERFACE)_item_Callback";\n',
-          TYPE=dart_element_type, INTERFACE=self._interface.id)
-
-    if self._HasNativeIndexSetter():
-      self._EmitNativeIndexSetter(dart_element_type)
-    else:
-      # The HTML library implementation of NodeList has a custom indexed setter
-      # implementation that uses the parent node the NodeList is associated
-      # with if one is available.
-      if self._interface.id != 'NodeList':
-        self._members_emitter.Emit(
-            '\n'
-            '  void operator[]=(int index, $TYPE value) {\n'
-            '    throw new UnsupportedOperationException("Cannot assign element of immutable List.");\n'
-            '  }\n',
-            TYPE=dart_element_type)
-
-    # The list interface for this class is manually generated.
-    if self._interface.id == 'NodeList':
-      return
-
-    # TODO(sra): Use separate mixins for mutable implementations of List<T>.
-    # TODO(sra): Use separate mixins for typed array implementations of List<T>.
-    template_file = 'immutable_list_mixin.darttemplate'
-    template = self._system._templates.Load(template_file)
-    self._members_emitter.Emit(template, E=dart_element_type)
-
-  def AmendIndexer(self, element_type):
-    # If interface is marked as having native indexed
-    # getter or setter, we must emit overrides as it's not
-    # guaranteed that the corresponding methods in C++ would be
-    # virtual.  For example, as of time of writing, even though
-    # Uint8ClampedArray inherits from Uint8Array, ::set method
-    # is not virtual and accessing it through Uint8Array pointer
-    # would lead to wrong semantics (modulo vs. clamping.)
-    dart_element_type = self._DartType(element_type)
-
-    if self._HasNativeIndexGetter():
-      self._EmitNativeIndexGetter(dart_element_type)
-    if self._HasNativeIndexSetter():
-      self._EmitNativeIndexSetter(dart_element_type)
-
-  def _HasNativeIndexGetter(self):
-    ext_attrs = self._interface.ext_attrs
-    return ('CustomIndexedGetter' in ext_attrs or
-        'NumericIndexedGetter' in ext_attrs)
-
-  def _EmitNativeIndexGetter(self, element_type):
-    dart_declaration = '%s operator[](int index)' % element_type
-    self._GenerateNativeBinding('numericIndexGetter', 2, dart_declaration,
-        'Callback', True)
-
-  def _HasNativeIndexSetter(self):
-    return 'CustomIndexedSetter' in self._interface.ext_attrs
-
-  def _EmitNativeIndexSetter(self, element_type):
-    dart_declaration = 'void operator[]=(int index, %s value)' % element_type
-    self._GenerateNativeBinding('numericIndexSetter', 3, dart_declaration,
-        'Callback', True)
-
-  def AddOperation(self, info, html_name):
-    """
-    Arguments:
-      info: An OperationInfo object.
-    """
-
-    operation = info.operations[0]
-
-    if 'CheckSecurityForNode' in operation.ext_attrs:
-      # FIXME: exclude from interface as well.
-      return
-
-    is_custom = 'Custom' in operation.ext_attrs
-    has_optional_arguments = any(self._IsArgumentOptionalInWebCore(operation, argument) for argument in operation.arguments)
-    needs_dispatcher = not is_custom and (len(info.operations) > 1 or has_optional_arguments)
-
-    if not needs_dispatcher:
-      type_renamer = self._DartType
-      default_value = 'null'
-    else:
-      type_renamer = lambda x: 'Dynamic'
-      default_value = '_null'
-
-    dart_declaration = '%s%s %s(%s)' % (
-        'static ' if info.IsStatic() else '',
-        self._DartType(info.type_name),
-        html_name,
-        info.ParametersImplementationDeclaration(type_renamer, default_value))
-
-    if not needs_dispatcher:
-      # Bind directly to native implementation
-      argument_count = (0 if info.IsStatic() else 1) + len(info.param_infos)
-      cpp_callback_name = self._GenerateNativeBinding(
-          info.name, argument_count, dart_declaration, 'Callback', is_custom)
-      if not is_custom:
-        self._GenerateOperationNativeCallback(operation, operation.arguments, cpp_callback_name)
-    else:
-      self._GenerateDispatcher(info.operations, dart_declaration, [info.name for info in info.param_infos])
-
-  def _GenerateDispatcher(self, operations, dart_declaration, argument_names):
-
-    body = self._members_emitter.Emit(
-        '\n'
-        '  $DECLARATION {\n'
-        '$!BODY'
-        '  }\n',
-        DECLARATION=dart_declaration)
-
-    version = [1]
-    def GenerateCall(operation, argument_count, checks):
-      if checks:
-        if operation.type.id != 'void':
-          template = '    if ($CHECKS) {\n      return $CALL;\n    }\n'
-        else:
-          template = '    if ($CHECKS) {\n      $CALL;\n      return;\n    }\n'
-      else:
-        if operation.type.id != 'void':
-          template = '    return $CALL;\n'
-        else:
-          template = '    $CALL;\n'
-
-      overload_name = '%s_%s' % (operation.id, version[0])
-      version[0] += 1
-      argument_list = ', '.join(argument_names[:argument_count])
-      call = '_%s(%s)' % (overload_name, argument_list)
-      body.Emit(template, CHECKS=' && '.join(checks), CALL=call)
-
-      dart_declaration = '%s%s _%s(%s)' % (
-          'static ' if operation.is_static else '',
-          self._DartType(operation.type.id), overload_name, argument_list)
-      cpp_callback_name = self._GenerateNativeBinding(
-          overload_name, (0 if operation.is_static else 1) + argument_count,
-          dart_declaration, 'Callback', False)
-      self._GenerateOperationNativeCallback(operation, operation.arguments[:argument_count], cpp_callback_name)
-
-    def GenerateChecksAndCall(operation, argument_count):
-      checks = ['%s === _null' % name for name in argument_names]
-      for i in range(0, argument_count):
-        argument = operation.arguments[i]
-        argument_name = argument_names[i]
-        checks[i] = '(%s is %s || %s === null)' % (
-            argument_name, self._DartType(argument.type.id), argument_name)
-      GenerateCall(operation, argument_count, checks)
-
-    # TODO: Optimize the dispatch to avoid repeated checks.
-    if len(operations) > 1:
-      for operation in operations:
-        for position, argument in enumerate(operation.arguments):
-          if self._IsArgumentOptionalInWebCore(operation, argument):
-            GenerateChecksAndCall(operation, position)
-        GenerateChecksAndCall(operation, len(operation.arguments))
-      body.Emit('    throw "Incorrect number or type of arguments";\n');
-    else:
-      operation = operations[0]
-      argument_count = len(operation.arguments)
-      for position, argument in list(enumerate(operation.arguments))[::-1]:
-        if self._IsArgumentOptionalInWebCore(operation, argument):
-          check = '%s !== _null' % argument_names[position]
-          # argument_count instead of position + 1 is used here to cover one
-          # complicated case with the effectively optional argument in the middle.
-          # Consider foo(x, [Optional] y, [Optional=DefaultIsNullString] z)
-          # (as of now it's modelled after HTMLMediaElement.webkitAddKey).
-          # y is optional in WebCore, while z is not.
-          # In this case, if y !== _null, we'd like to emit foo(x, y, z) invocation, not
-          # foo(x, y).
-          GenerateCall(operation, argument_count, [check])
-          argument_count = position
-      GenerateCall(operation, argument_count, [])
-
-  def SecondaryContext(self, interface):
-    pass
-
-  def _GenerateOperationNativeCallback(self, operation, arguments, cpp_callback_name):
-    webcore_function_name = operation.ext_attrs.get('ImplementedAs', operation.id)
-    function_expression = self._GenerateWebCoreFunctionExpression(webcore_function_name, operation)
-    self._GenerateNativeCallback(
-        cpp_callback_name,
-        not operation.is_static,
-        function_expression,
-        operation,
-        arguments,
-        operation.type.id,
-        operation.raises)
-
-  def _GenerateNativeCallback(self,
-      callback_name,
-      needs_receiver,
-      function_expression,
-      node,
-      arguments,
-      return_type,
-      raises_dom_exception):
-    ext_attrs = node.ext_attrs
-
-    cpp_arguments = []
-    requires_v8_scope = \
-        any((self._TypeInfo(argument.type.id).requires_v8_scope() for argument in arguments))
-    runtime_check = None
-    raises_exceptions = raises_dom_exception or arguments
-
-    requires_stack_info = ext_attrs.get('CallWith') == 'ScriptArguments|CallStack'
-    if requires_stack_info:
-      raises_exceptions = True
-      requires_v8_scope = True
-      cpp_arguments = ['scriptArguments', 'scriptCallStack']
-      # WebKit uses scriptArguments to reconstruct last argument, so
-      # it's not needed and should be just removed.
-      arguments = arguments[:-1]
-
-    requires_script_execution_context = ext_attrs.get('CallWith') == 'ScriptExecutionContext'
-    if requires_script_execution_context:
-      raises_exceptions = True
-      cpp_arguments = ['context']
-
-    requires_dom_window = 'NamedConstructor' in ext_attrs
-    if requires_dom_window:
-      raises_exceptions = True
-      cpp_arguments = ['document']
-
-    if 'ImplementedBy' in ext_attrs:
-      assert needs_receiver
-      self._cpp_impl_includes.add('"%s.h"' % ext_attrs['ImplementedBy'])
-      cpp_arguments.append('receiver')
-
-    if 'Reflect' in ext_attrs:
-      cpp_arguments = [self._GenerateWebCoreReflectionAttributeName(node)]
-
-    v8EnabledPerContext = ext_attrs.get('synthesizedV8EnabledPerContext', ext_attrs.get('V8EnabledPerContext'))
-    v8EnabledAtRuntime = ext_attrs.get('synthesizedV8EnabledAtRuntime', ext_attrs.get('V8EnabledAtRuntime'))
-    assert(not (v8EnabledPerContext and v8EnabledAtRuntime))
-
-    if v8EnabledPerContext:
-      raises_exceptions = True
-      self._cpp_impl_includes.add('"ContextFeatures.h"')
-      self._cpp_impl_includes.add('"DOMWindow.h"')
-      runtime_check = emitter.Format(
-          '        if (!ContextFeatures::$(FEATURE)Enabled(DartUtilities::domWindowForCurrentIsolate()->document())) {\n'
-          '            exception = Dart_NewString("Feature $FEATURE is not enabled");\n'
-          '            goto fail;\n'
-          '        }',
-          FEATURE=v8EnabledPerContext)
-
-    if v8EnabledAtRuntime:
-      raises_exceptions = True
-      self._cpp_impl_includes.add('"RuntimeEnabledFeatures.h"')
-      runtime_check = emitter.Format(
-          '        if (!RuntimeEnabledFeatures::$(FEATURE)Enabled()) {\n'
-          '            exception = Dart_NewString("Feature $FEATURE is not enabled");\n'
-          '            goto fail;\n'
-          '        }',
-          FEATURE=_ToWebKitName(v8EnabledAtRuntime))
-
-    body_emitter = self._cpp_definitions_emitter.Emit(
-        '\n'
-        'static void $CALLBACK_NAME(Dart_NativeArguments args)\n'
-        '{\n'
-        '    DartApiScope dartApiScope;\n'
-        '$!BODY'
-        '}\n',
-        CALLBACK_NAME=callback_name)
-
-    if raises_exceptions:
-      body_emitter = body_emitter.Emit(
-          '    Dart_Handle exception = 0;\n'
-          '$!BODY'
-          '\n'
-          'fail:\n'
-          '    Dart_ThrowException(exception);\n'
-          '    ASSERT_NOT_REACHED();\n')
-
-    body_emitter = body_emitter.Emit(
-        '    {\n'
-        '$!BODY'
-        '        return;\n'
-        '    }\n')
-
-    if requires_v8_scope:
-      body_emitter.Emit(
-          '        V8Scope v8scope;\n\n')
-
-    if runtime_check:
-      body_emitter.Emit(
-          '$RUNTIME_CHECK\n',
-          RUNTIME_CHECK=runtime_check)
-
-    if requires_script_execution_context:
-      body_emitter.Emit(
-          '        ScriptExecutionContext* context = DartUtilities::scriptExecutionContext();\n'
-          '        if (!context) {\n'
-          '            exception = Dart_NewString("Failed to retrieve a context");\n'
-          '            goto fail;\n'
-          '        }\n\n')
-
-    if requires_dom_window:
-      self._cpp_impl_includes.add('"DOMWindow.h"')
-      body_emitter.Emit(
-          '        DOMWindow* domWindow = DartUtilities::domWindowForCurrentIsolate();\n'
-          '        if (!domWindow) {\n'
-          '            exception = Dart_NewString("Failed to fetch domWindow");\n'
-          '            goto fail;\n'
-          '        }\n'
-          '        Document* document = domWindow->document();\n')
-
-    if needs_receiver:
-      body_emitter.Emit(
-          '        $WEBCORE_CLASS_NAME* receiver = DartDOMWrapper::receiver< $WEBCORE_CLASS_NAME >(args);\n',
-          WEBCORE_CLASS_NAME=self._interface_type_info.native_type())
-
-    if requires_stack_info:
-      self._cpp_impl_includes.add('"ScriptArguments.h"')
-      self._cpp_impl_includes.add('"ScriptCallStack.h"')
-      body_emitter.Emit(
-          '\n'
-          '        Dart_Handle customArgument = Dart_GetNativeArgument(args, $INDEX);\n'
-          '        RefPtr<ScriptArguments> scriptArguments(DartUtilities::createScriptArguments(customArgument, exception));\n'
-          '        if (!scriptArguments)\n'
-          '            goto fail;\n'
-          '        RefPtr<ScriptCallStack> scriptCallStack(DartUtilities::createScriptCallStack());\n'
-          '        if (!scriptCallStack->size())\n'
-          '            return;\n',
-          INDEX=len(arguments) + 1)
-
-    # Emit arguments.
-    start_index = 1 if needs_receiver else 0
-    for i, argument in enumerate(arguments):
-      argument_expression_template, type, cls, function = \
-          self._TypeInfo(argument.type.id).to_native_info(argument, self._interface.id)
-
-      if ((IsOptional(argument) and not self._IsArgumentOptionalInWebCore(node, argument)) or
-          (argument.ext_attrs.get('Optional') == 'DefaultIsNullString')):
-        function += 'WithNullCheck'
-
-      argument_name = DartDomNameOfAttribute(argument)
-      body_emitter.Emit(
-          '\n'
-          '        $TYPE $ARGUMENT_NAME = $CLS::$FUNCTION(Dart_GetNativeArgument(args, $INDEX), exception);\n'
-          '        if (exception)\n'
-          '            goto fail;\n',
-          TYPE=type,
-          ARGUMENT_NAME=argument_name,
-          CLS=cls,
-          FUNCTION=function,
-          INDEX=start_index + i)
-      self._cpp_impl_includes.add('"%s.h"' % cls)
-      cpp_arguments.append(argument_expression_template % argument_name)
-
-    body_emitter.Emit('\n')
-
-    if 'NeedsUserGestureCheck' in ext_attrs:
-      cpp_arguments.append('DartUtilities::processingUserGesture')
-
-    invocation_emitter = body_emitter
-    if raises_dom_exception:
-      cpp_arguments.append('ec')
-      invocation_emitter = body_emitter.Emit(
-        '        ExceptionCode ec = 0;\n'
-        '$!INVOCATION'
-        '        if (UNLIKELY(ec)) {\n'
-        '            exception = DartDOMWrapper::exceptionCodeToDartException(ec);\n'
-        '            goto fail;\n'
-        '        }\n')
-
-    function_call = '%s(%s)' % (function_expression, ', '.join(cpp_arguments))
-    if return_type == 'void':
-      invocation_emitter.Emit(
-        '        $FUNCTION_CALL;\n',
-        FUNCTION_CALL=function_call)
-    else:
-      return_type_info = self._TypeInfo(return_type)
-      self._cpp_impl_includes |= set(return_type_info.conversion_includes())
-
-      # Generate to Dart conversion of C++ value.
-      to_dart_conversion = return_type_info.to_dart_conversion(function_call, self._interface.id, ext_attrs)
-      invocation_emitter.Emit(
-        '        Dart_Handle returnValue = $TO_DART_CONVERSION;\n'
-        '        if (returnValue)\n'
-        '            Dart_SetReturnValue(args, returnValue);\n',
-        TO_DART_CONVERSION=to_dart_conversion)
-
-  def _GenerateNativeBinding(self, idl_name, argument_count, dart_declaration,
-      native_suffix, is_custom):
-    native_binding = '%s_%s_%s' % (self._interface.id, idl_name, native_suffix)
-    self._members_emitter.Emit(
-        '\n'
-        '  $DART_DECLARATION native "$NATIVE_BINDING";\n',
-        DART_DECLARATION=dart_declaration, NATIVE_BINDING=native_binding)
-
-    cpp_callback_name = '%s%s' % (idl_name, native_suffix)
-    self._cpp_resolver_emitter.Emit(
-        '    if (argumentCount == $ARGC && name == "$NATIVE_BINDING")\n'
-        '        return Dart$(INTERFACE_NAME)Internal::$CPP_CALLBACK_NAME;\n',
-        ARGC=argument_count,
-        NATIVE_BINDING=native_binding,
-        INTERFACE_NAME=self._interface.id,
-        CPP_CALLBACK_NAME=cpp_callback_name)
-
-    if is_custom:
-      self._cpp_declarations_emitter.Emit(
-          '\n'
-          'void $CPP_CALLBACK_NAME(Dart_NativeArguments);\n',
-          CPP_CALLBACK_NAME=cpp_callback_name)
-
-    return cpp_callback_name
-
-  def _GenerateWebCoreReflectionAttributeName(self, attr):
-    namespace = 'HTMLNames'
-    svg_exceptions = ['class', 'id', 'onabort', 'onclick', 'onerror', 'onload',
-                      'onmousedown', 'onmousemove', 'onmouseout', 'onmouseover',
-                      'onmouseup', 'onresize', 'onscroll', 'onunload']
-    if self._interface.id.startswith('SVG') and not attr.id in svg_exceptions:
-      namespace = 'SVGNames'
-    self._cpp_impl_includes.add('"%s.h"' % namespace)
-
-    attribute_name = attr.ext_attrs['Reflect'] or attr.id.lower()
-    return 'WebCore::%s::%sAttr' % (namespace, attribute_name)
-
-  def _GenerateWebCoreFunctionExpression(self, function_name, idl_node):
-    if 'ImplementedBy' in idl_node.ext_attrs:
-      return '%s::%s' % (idl_node.ext_attrs['ImplementedBy'], function_name)
-    if idl_node.is_static:
-      return '%s::%s' % (self._interface_type_info.idl_type(), function_name)
-    return '%s%s' % (self._interface_type_info.receiver(), function_name)
-
-  def _TypeInfo(self, type_name):
-    return self._system._type_registry.TypeInfo(type_name)
-
-  def _IsArgumentOptionalInWebCore(self, operation, argument):
-    if not IsOptional(argument):
-      return False
-    if 'Callback' in argument.ext_attrs:
-      return False
-    if operation.id in ['addEventListener', 'removeEventListener'] and argument.id == 'useCapture':
-      return False
-    # Another option would be to adjust in IDLs, but let's keep it here for now
-    # as it's a single instance.
-    if self._interface.id == 'CSSStyleDeclaration' and operation.id == 'setProperty' and argument.id == 'priority':
-      return False
-    return True
-
-
-def _GenerateCPPIncludes(includes):
-  return ''.join(['#include %s\n' % include for include in sorted(includes)])
-
-def _FindInHierarchy(database, interface, test):
-  if test(interface):
-    return interface
-  for parent in interface.parents:
-    parent_name = parent.type.id
-    if not database.HasInterface(parent.type.id):
-      continue
-    parent_interface = database.GetInterface(parent.type.id)
-    parent_interface = _FindInHierarchy(database, parent_interface, test)
-    if parent_interface:
-      return parent_interface
-
-def _ToWebKitName(name):
-  name = name[0].lower() + name[1:]
-  name = re.sub(r'^(hTML|uRL|jS|xML|xSLT)', lambda s: s.group(1).lower(),
-                name)
-  return re.sub(r'^(create|exclusive)', lambda s: 'is' + s.group(1).capitalize(),
-                name)