# Copyright (C) 2010-2018 Apple 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:
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
# 2.  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.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.

import collections
import re
import sys

from webkit import parser

WANTS_CONNECTION_ATTRIBUTE = 'WantsConnection'
LEGACY_RECEIVER_ATTRIBUTE = 'LegacyReceiver'
SYNCHRONOUS_ATTRIBUTE = 'Synchronous'
ASYNC_ATTRIBUTE = 'Async'

_license_header = """/*
 * Copyright (C) 2010-2018 Apple 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:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 */

"""


def messages_header_filename(receiver):
    return '%sMessages.h' % receiver.name


def surround_in_condition(string, condition):
    if not condition:
        return string
    return '#if %s\n%s#endif\n' % (condition, string)


def function_parameter_type(type, kind):
    # Don't use references for built-in types.
    builtin_types = frozenset([
        'bool',
        'float',
        'double',
        'uint8_t',
        'uint16_t',
        'uint32_t',
        'uint64_t',
        'int8_t',
        'int16_t',
        'int32_t',
        'int64_t',
    ])

    if type in builtin_types:
        return type

    if kind.startswith('enum:'):
        return type

    return 'const %s&' % type


def reply_parameter_type(type):
    return '%s&' % type


def move_type(type):
    return '%s&&' % type


def arguments_type(message):
    return 'std::tuple<%s>' % ', '.join(function_parameter_type(parameter.type, parameter.kind) for parameter in message.parameters)


def reply_type(message):
    return 'std::tuple<%s>' % (', '.join(reply_parameter_type(parameter.type) for parameter in message.reply_parameters))


def reply_arguments_type(message):
    return 'std::tuple<%s>' % (', '.join(parameter.type for parameter in message.reply_parameters))


def message_to_struct_declaration(message):
    result = []
    function_parameters = [(function_parameter_type(x.type, x.kind), x.name) for x in message.parameters]
    result.append('class %s {\n' % message.name)
    result.append('public:\n')
    result.append('    typedef %s Arguments;\n' % arguments_type(message))
    result.append('\n')
    result.append('    static IPC::StringReference receiverName() { return messageReceiverName(); }\n')
    result.append('    static IPC::StringReference name() { return IPC::StringReference("%s"); }\n' % message.name)
    result.append('    static const bool isSync = %s;\n' % ('false', 'true')[message.reply_parameters != None and not message.has_attribute(ASYNC_ATTRIBUTE)])
    result.append('\n')
    if message.reply_parameters != None:
        send_parameters = [(function_parameter_type(x.type, x.kind), x.name) for x in message.reply_parameters]
        completion_handler_parameters = '%s' % ', '.join([' '.join(x) for x in send_parameters])
        if message.has_attribute(ASYNC_ATTRIBUTE):
            move_parameters = ', '.join([move_type(x.type) for x in message.reply_parameters])
            result.append('    static void callReply(IPC::Decoder&, CompletionHandler<void(%s)>&&);\n' % move_parameters)
            result.append('    static void cancelReply(CompletionHandler<void(%s)>&&);\n' % move_parameters)
            result.append('    static IPC::StringReference asyncMessageReplyName() { return { "%sReply" }; }\n' % message.name)
            result.append('    using AsyncReply')
        elif message.has_attribute(SYNCHRONOUS_ATTRIBUTE):
            result.append('    using DelayedReply')
        if message.has_attribute(SYNCHRONOUS_ATTRIBUTE) or message.has_attribute(ASYNC_ATTRIBUTE):
            result.append(' = CompletionHandler<void(%s)>;\n' % completion_handler_parameters)
            result.append('    static void send(std::unique_ptr<IPC::Encoder>&&, IPC::Connection&')
            if len(send_parameters):
                result.append(', %s' % completion_handler_parameters)
            result.append(');\n')
        result.append('    using Reply = %s;\n' % reply_type(message))
        result.append('    using ReplyArguments = %s;\n' % reply_arguments_type(message))

    if len(function_parameters):
        result.append('    %s%s(%s)' % (len(function_parameters) == 1 and 'explicit ' or '', message.name, ', '.join([' '.join(x) for x in function_parameters])))
        result.append('\n        : m_arguments(%s)\n' % ', '.join([x[1] for x in function_parameters]))
        result.append('    {\n')
        result.append('    }\n\n')
    result.append('    const Arguments& arguments() const\n')
    result.append('    {\n')
    result.append('        return m_arguments;\n')
    result.append('    }\n')
    result.append('\n')
    result.append('private:\n')
    result.append('    Arguments m_arguments;\n')
    result.append('};\n')
    return surround_in_condition(''.join(result), message.condition)


def forward_declaration(namespace, kind_and_type):
    kind, type = kind_and_type

    qualified_name = '%s::%s' % (namespace, type)
    if kind == 'struct':
        return 'struct %s' % type
    elif kind.startswith('enum:'):
        return 'enum class %s : %s' % (type, kind[5:])
    else:
        return 'class %s' % type


def forward_declarations_for_namespace(namespace, kind_and_types):
    result = []
    result.append('namespace %s {\n' % namespace)
    result += ['%s;\n' % forward_declaration(namespace, x) for x in kind_and_types]
    result.append('}\n')
    return ''.join(result)


def forward_declarations_and_headers(receiver):
    types_by_namespace = collections.defaultdict(set)

    headers = set([
        '"ArgumentCoders.h"',
        '<wtf/Forward.h>',
    ])

    header_conditions = {
        '"LayerHostingContext.h"': ["PLATFORM(COCOA)", ],
    }

    non_template_wtf_types = frozenset([
        'MachSendRight',
        'String',
    ])

    headers.add('"Connection.h"')
    headers.add('<wtf/ThreadSafeRefCounted.h>')

    no_forward_declaration_types = frozenset([
        'MachSendRight',
        'String',
        'WebCore::DocumentIdentifier',
        'WebCore::FetchIdentifier',
        'WebCore::FrameIdentifier',
        'WebCore::PageIdentifier',
        'WebCore::PointerID',
        'WebCore::ProcessIdentifier',
        'WebCore::ServiceWorkerIdentifier',
        'WebCore::ServiceWorkerJobIdentifier',
        'WebCore::ServiceWorkerOrClientData',
        'WebCore::ServiceWorkerOrClientIdentifier',
        'WebCore::ServiceWorkerRegistrationIdentifier',
        'WebCore::SWServerConnectionIdentifier',
        'WebKit::ActivityStateChangeID',
        'WebKit::LayerHostingContextID',
        'WebKit::TransactionID',
        'WebKit::StorageAreaIdentifier',
        'WebKit::StorageAreaImplIdentifier',
        'WebKit::StorageNamespaceIdentifier',
        'WebKit::UserContentControllerIdentifier',
    ])

    for parameter in receiver.iterparameters():
        kind = parameter.kind
        type = parameter.type

        if type.find('<') != -1 or type in no_forward_declaration_types:
            # Don't forward declare class templates.
            headers.update(headers_for_type(type))
            continue

        split = type.split('::')

        # Handle WTF types even if the WTF:: prefix is not given
        if split[0] in non_template_wtf_types:
            split.insert(0, 'WTF')

        if len(split) == 2:
            namespace = split[0]
            inner_type = split[1]
            types_by_namespace[namespace].add((kind, inner_type))
        elif len(split) > 2:
            # We probably have a nested struct, which means we can't forward declare it.
            # Include its header instead.
            headers.update(headers_for_type(type))

    forward_declarations = '\n'.join([forward_declarations_for_namespace(namespace, types) for (namespace, types) in sorted(types_by_namespace.items())])

    header_includes = []
    for header in sorted(headers):
        if header in header_conditions and not None in header_conditions[header]:
            header_include = '#if %s\n' % ' || '.join(set(header_conditions[header]))
            header_include += '#include %s\n' % header
            header_include += '#endif\n'
            header_includes.append(header_include)
        else:
            header_includes.append('#include %s\n' % header)

    return (forward_declarations, header_includes)


def generate_messages_header(file):
    receiver = parser.parse(file)

    result = []

    result.append(_license_header)

    result.append('#pragma once\n')
    result.append('\n')

    if receiver.condition:
        result.append('#if %s\n\n' % receiver.condition)

    forward_declarations, headers = forward_declarations_and_headers(receiver)

    result += headers
    result.append('\n')

    result.append(forward_declarations)
    result.append('\n')

    result.append('namespace Messages {\nnamespace %s {\n' % receiver.name)
    result.append('\n')
    result.append('static inline IPC::StringReference messageReceiverName()\n')
    result.append('{\n')
    result.append('    return IPC::StringReference("%s");\n' % receiver.name)
    result.append('}\n')
    result.append('\n')
    result.append('\n'.join([message_to_struct_declaration(x) for x in receiver.messages]))
    result.append('\n')
    result.append('} // namespace %s\n} // namespace Messages\n' % receiver.name)

    if receiver.condition:
        result.append('\n#endif // %s\n' % receiver.condition)

    return ''.join(result)


def handler_function(receiver, message):
    if message.name.find('URL') == 0:
        return '%s::%s' % (receiver.name, 'url' + message.name[3:])
    return '%s::%s' % (receiver.name, message.name[0].lower() + message.name[1:])


def async_message_statement(receiver, message):
    dispatch_function_args = ['decoder', 'this', '&%s' % handler_function(receiver, message)]

    dispatch_function = 'handleMessage'
    if message.has_attribute(ASYNC_ATTRIBUTE):
        dispatch_function += 'Async'
        dispatch_function_args.insert(0, 'connection')

    if message.has_attribute(WANTS_CONNECTION_ATTRIBUTE):
        dispatch_function_args.insert(0, 'connection')

    result = []
    result.append('    if (decoder.messageName() == Messages::%s::%s::name()) {\n' % (receiver.name, message.name))
    result.append('        IPC::%s<Messages::%s::%s>(%s);\n' % (dispatch_function, receiver.name, message.name, ', '.join(dispatch_function_args)))
    result.append('        return;\n')
    result.append('    }\n')
    return surround_in_condition(''.join(result), message.condition)


def sync_message_statement(receiver, message):
    dispatch_function = 'handleMessage'
    if message.has_attribute(SYNCHRONOUS_ATTRIBUTE):
        dispatch_function += 'Synchronous'
        if message.has_attribute(WANTS_CONNECTION_ATTRIBUTE):
            dispatch_function += 'WantsConnection'
    if message.has_attribute(ASYNC_ATTRIBUTE):
        dispatch_function += 'Async'

    wants_connection = message.has_attribute(SYNCHRONOUS_ATTRIBUTE) or message.has_attribute(WANTS_CONNECTION_ATTRIBUTE)

    result = []
    result.append('    if (decoder.messageName() == Messages::%s::%s::name()) {\n' % (receiver.name, message.name))
    result.append('        IPC::%s<Messages::%s::%s>(%sdecoder, %sreplyEncoder, this, &%s);\n' % (dispatch_function, receiver.name, message.name, 'connection, ' if wants_connection else '', '' if message.has_attribute(SYNCHRONOUS_ATTRIBUTE) or message.has_attribute(ASYNC_ATTRIBUTE) else '*', handler_function(receiver, message)))
    result.append('        return;\n')
    result.append('    }\n')
    return surround_in_condition(''.join(result), message.condition)


def class_template_headers(template_string):
    template_string = template_string.strip()

    class_template_types = {
        'WebCore::RectEdges': {'headers': ['<WebCore/RectEdges.h>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
        'HashMap': {'headers': ['<wtf/HashMap.h>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
        'HashSet': {'headers': ['<wtf/HashSet.h>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
        'Optional': {'headers': ['<wtf/Optional.h>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
        'OptionSet': {'headers': ['<wtf/OptionSet.h>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
        'Vector': {'headers': ['<wtf/Vector.h>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
        'std::pair': {'headers': ['<utility>'], 'argument_coder_headers': ['"ArgumentCoders.h"']},
    }

    match = re.match('(?P<template_name>.+?)<(?P<parameter_string>.+)>', template_string)
    if not match:
        return {'header_infos': [], 'types': [template_string]}

    template_name = match.groupdict()['template_name']
    if template_name not in class_template_types:
        sys.stderr.write("Error: no class template type is defined for '%s'\n" % (template_string))
        sys.exit(1)

    header_infos = [class_template_types[template_name]]
    types = []

    for parameter in parser.split_parameters_string(match.groupdict()['parameter_string']):
        parameter_header_infos_and_types = class_template_headers(parameter)

        header_infos += parameter_header_infos_and_types['header_infos']
        types += parameter_header_infos_and_types['types']

    return {'header_infos': header_infos, 'types': types}


def argument_coder_headers_for_type(type):
    header_infos_and_types = class_template_headers(type)

    special_cases = {
        'String': '"ArgumentCoders.h"',
        'WebKit::ScriptMessageHandlerHandle': '"WebScriptMessageHandler.h"',
    }

    headers = []
    for header_info in header_infos_and_types['header_infos']:
        headers += header_info['argument_coder_headers']

    for type in header_infos_and_types['types']:
        if type in special_cases:
            headers.append(special_cases[type])
            continue

        split = type.split('::')
        if len(split) < 2:
            continue
        if split[0] == 'WebCore':
            headers.append('"WebCoreArgumentCoders.h"')

    return headers


def headers_for_type(type):
    header_infos_and_types = class_template_headers(type)

    special_cases = {
        'IPC::SharedBufferDataReference': ['"SharedBufferDataReference.h"', '"DataReference.h"'],
        'MachSendRight': ['<wtf/MachSendRight.h>'],
        'JSC::MessageLevel': ['<JavaScriptCore/ConsoleTypes.h>'],
        'JSC::MessageSource': ['<JavaScriptCore/ConsoleTypes.h>'],
        'Inspector::InspectorTargetType': ['<JavaScriptCore/InspectorTarget.h>'],
        'Inspector::FrontendChannel::ConnectionType': ['<JavaScriptCore/InspectorFrontendChannel.h>'],
        'MonotonicTime': ['<wtf/MonotonicTime.h>'],
        'Seconds': ['<wtf/Seconds.h>'],
        'WallTime': ['<wtf/WallTime.h>'],
        'String': ['<wtf/text/WTFString.h>'],
        'PAL::SessionID': ['<pal/SessionID.h>'],
        'WebCore::AutoplayEventFlags': ['<WebCore/AutoplayEvent.h>'],
        'WebCore::DOMPasteAccessResponse': ['<WebCore/DOMPasteAccess.h>'],
        'WebKit::DocumentEditingContextRequest': ['"DocumentEditingContext.h"'],
        'WebCore::DragHandlingMethod': ['<WebCore/DragActions.h>'],
        'WebCore::ExceptionDetails': ['<WebCore/JSDOMExceptionHandling.h>'],
        'WebCore::FileChooserSettings': ['<WebCore/FileChooser.h>'],
        'WebCore::ShareDataWithParsedURL': ['<WebCore/ShareData.h>'],
        'WebCore::FontChanges': ['<WebCore/FontAttributeChanges.h>'],
        'WebCore::FrameLoadType': ['<WebCore/FrameLoaderTypes.h>'],
        'WebCore::GrammarDetail': ['<WebCore/TextCheckerClient.h>'],
        'WebCore::HasInsecureContent': ['<WebCore/FrameLoaderTypes.h>'],
        'WebCore::Highlight': ['<WebCore/InspectorOverlay.h>'],
        'WebCore::IncludeSecureCookies': ['<WebCore/CookieJar.h>'],
        'WebCore::IndexedDB::ObjectStoreOverwriteMode': ['<WebCore/IndexedDB.h>'],
        'WebCore::InputMode': ['<WebCore/InputMode.h>'],
        'WebCore::KeyframeValueList': ['<WebCore/GraphicsLayer.h>'],
        'WebCore::KeypressCommand': ['<WebCore/KeyboardEvent.h>'],
        'WebCore::LockBackForwardList': ['<WebCore/FrameLoaderTypes.h>'],
        'WebCore::NetworkTransactionInformation': ['<WebCore/NetworkLoadInformation.h>'],
        'WebCore::PasteboardCustomData': ['<WebCore/Pasteboard.h>'],
        'WebCore::PasteboardImage': ['<WebCore/Pasteboard.h>'],
        'WebCore::PasteboardURL': ['<WebCore/Pasteboard.h>'],
        'WebCore::PasteboardWebContent': ['<WebCore/Pasteboard.h>'],
        'WebCore::PaymentAuthorizationResult': ['<WebCore/ApplePaySessionPaymentRequest.h>'],
        'WebCore::PaymentMethodUpdate': ['<WebCore/ApplePaySessionPaymentRequest.h>'],
        'WebCore::PluginInfo': ['<WebCore/PluginData.h>'],
        'WebCore::PolicyAction': ['<WebCore/FrameLoaderTypes.h>'],
        'WebCore::PolicyCheckIdentifier': ['<WebCore/FrameLoaderTypes.h>'],
        'WebCore::ProcessIdentifier': ['<WebCore/ProcessIdentifier.h>'],
        'WebCore::RecentSearch': ['<WebCore/SearchPopupMenu.h>'],
        'WebCore::RouteSharingPolicy': ['<WebCore/AudioSession.h>'],
        'WebCore::SWServerConnectionIdentifier': ['<WebCore/ServiceWorkerTypes.h>'],
        'WebCore::ServiceWorkerJobIdentifier': ['<WebCore/ServiceWorkerTypes.h>'],
        'WebCore::ServiceWorkerOrClientData': ['<WebCore/ServiceWorkerTypes.h>', '<WebCore/ServiceWorkerClientData.h>', '<WebCore/ServiceWorkerData.h>'],
        'WebCore::ServiceWorkerOrClientIdentifier': ['<WebCore/ServiceWorkerTypes.h>', '<WebCore/ServiceWorkerClientIdentifier.h>'],
        'WebCore::ServiceWorkerRegistrationIdentifier': ['<WebCore/ServiceWorkerTypes.h>'],
        'WebCore::ServiceWorkerRegistrationState': ['<WebCore/ServiceWorkerTypes.h>'],
        'WebCore::ServiceWorkerState': ['<WebCore/ServiceWorkerTypes.h>'],
        'WebCore::ShippingContactUpdate': ['<WebCore/ApplePaySessionPaymentRequest.h>'],
        'WebCore::ShippingMethodUpdate': ['<WebCore/ApplePaySessionPaymentRequest.h>'],
        'WebCore::ShouldNotifyWhenResolved': ['<WebCore/ServiceWorkerTypes.h>'],
        'WebCore::ShouldSample': ['<WebCore/DiagnosticLoggingClient.h>'],
        'WebCore::StorageAccessPromptWasShown': ['<WebCore/DocumentStorageAccess.h>'],
        'WebCore::StorageAccessWasGranted': ['<WebCore/DocumentStorageAccess.h>'],
        'WebCore::SupportedPluginIdentifier': ['<WebCore/PluginData.h>'],
        'WebCore::TextCheckingRequestData': ['<WebCore/TextChecking.h>'],
        'WebCore::TextCheckingResult': ['<WebCore/TextCheckerClient.h>'],
        'WebCore::TextCheckingType': ['<WebCore/TextChecking.h>'],
        'WebCore::TextIndicatorData': ['<WebCore/TextIndicator.h>'],
        'WebCore::ViewportAttributes': ['<WebCore/ViewportArguments.h>'],
        'WebCore::WillContinueLoading': ['<WebCore/FrameLoaderTypes.h>'],
        'WebCore::SelectionRect': ['"EditorState.h"'],
        'WebKit::ActivityStateChangeID': ['"DrawingAreaInfo.h"'],
        'WebKit::BackForwardListItemState': ['"SessionState.h"'],
        'WebKit::LayerHostingContextID': ['"LayerHostingContext.h"'],
        'WebKit::LayerHostingMode': ['"LayerTreeContext.h"'],
        'WebKit::PageState': ['"SessionState.h"'],
        'WebKit::WebGestureEvent': ['"WebEvent.h"'],
        'WebKit::WebKeyboardEvent': ['"WebEvent.h"'],
        'WebKit::WebMouseEvent': ['"WebEvent.h"'],
        'WebKit::WebTouchEvent': ['"WebEvent.h"'],
        'WebKit::WebWheelEvent': ['"WebEvent.h"'],
        'struct WebKit::TextInputContext': ['"TextInputContext.h"'],
        'struct WebKit::WebUserScriptData': ['"WebUserContentControllerDataTypes.h"'],
        'struct WebKit::WebUserStyleSheetData': ['"WebUserContentControllerDataTypes.h"'],
        'struct WebKit::WebScriptMessageHandlerData': ['"WebUserContentControllerDataTypes.h"'],
    }

    headers = []
    for header_info in header_infos_and_types['header_infos']:
        headers += header_info['headers']

    for type in header_infos_and_types['types']:
        if type in special_cases:
            headers += special_cases[type]
            continue

        # We assume that we must include a header for a type iff it has a scope
        # resolution operator (::).
        split = type.split('::')
        if len(split) < 2:
            continue

        if split[0] == 'WebKit' or split[0] == 'IPC':
            headers.append('"%s.h"' % split[1])
        else:
            headers.append('<%s/%s.h>' % tuple(split[0:2]))

    return headers


def generate_message_handler(file):
    receiver = parser.parse(file)
    header_conditions = {
        '"%s"' % messages_header_filename(receiver): [None],
        '"HandleMessage.h"': [None],
        '"Decoder.h"': [None],
    }

    type_conditions = {}
    for parameter in receiver.iterparameters():
        if not parameter.type in type_conditions:
            type_conditions[parameter.type] = []

        if not parameter.condition in type_conditions[parameter.type]:
            type_conditions[parameter.type].append(parameter.condition)

    for parameter in receiver.iterparameters():
        type = parameter.type
        conditions = type_conditions[type]

        argument_encoder_headers = argument_coder_headers_for_type(type)
        if argument_encoder_headers:
            for header in argument_encoder_headers:
                if header not in header_conditions:
                    header_conditions[header] = []
                header_conditions[header].extend(conditions)

        type_headers = headers_for_type(type)
        for header in type_headers:
            if header not in header_conditions:
                header_conditions[header] = []
            header_conditions[header].extend(conditions)

    for message in receiver.messages:
        if message.reply_parameters is not None:
            for reply_parameter in message.reply_parameters:
                type = reply_parameter.type
                argument_encoder_headers = argument_coder_headers_for_type(type)
                if argument_encoder_headers:
                    for header in argument_encoder_headers:
                        if header not in header_conditions:
                            header_conditions[header] = []
                        header_conditions[header].append(message.condition)

                type_headers = headers_for_type(type)
                for header in type_headers:
                    if header not in header_conditions:
                        header_conditions[header] = []
                    header_conditions[header].append(message.condition)

    result = []

    result.append(_license_header)
    result.append('#include "config.h"\n')
    result.append('\n')

    if receiver.condition:
        result.append('#if %s\n\n' % receiver.condition)

    result.append('#include "%s.h"\n\n' % receiver.name)
    for header in sorted(header_conditions):
        if header_conditions[header] and not None in header_conditions[header]:
            result.append('#if %s\n' % ' || '.join(set(header_conditions[header])))
            result += ['#include %s\n' % header]
            result.append('#endif\n')
        else:
            result += ['#include %s\n' % header]
    result.append('\n')

    delayed_or_async_messages = []
    for message in receiver.messages:
        if message.reply_parameters != None and (message.has_attribute(SYNCHRONOUS_ATTRIBUTE) or message.has_attribute(ASYNC_ATTRIBUTE)):
            delayed_or_async_messages.append(message)

    if delayed_or_async_messages:
        result.append('namespace Messages {\n\nnamespace %s {\n\n' % receiver.name)

        for message in delayed_or_async_messages:
            send_parameters = [(function_parameter_type(x.type, x.kind), x.name) for x in message.reply_parameters]

            if message.condition:
                result.append('#if %s\n\n' % message.condition)

            if message.has_attribute(ASYNC_ATTRIBUTE):
                move_parameters = message.name, ', '.join([move_type(x.type) for x in message.reply_parameters])
                result.append('void %s::callReply(IPC::Decoder& decoder, CompletionHandler<void(%s)>&& completionHandler)\n{\n' % move_parameters)
                for x in message.reply_parameters:
                    result.append('    Optional<%s> %s;\n' % (x.type, x.name))
                    result.append('    decoder >> %s;\n' % x.name)
                    result.append('    if (!%s) {\n        ASSERT_NOT_REACHED();\n        cancelReply(WTFMove(completionHandler));\n        return;\n    }\n' % x.name)
                result.append('    completionHandler(')
                if len(message.reply_parameters):
                    result.append('WTFMove(*%s)' % ('), WTFMove(*'.join(x.name for x in message.reply_parameters)))
                result.append(');\n}\n\n')
                result.append('void %s::cancelReply(CompletionHandler<void(%s)>&& completionHandler)\n{\n    completionHandler(' % move_parameters)
                result.append(', '.join(['IPC::AsyncReplyError<' + x.type + '>::create()' for x in message.reply_parameters]))
                result.append(');\n}\n\n')

            result.append('void %s::send(std::unique_ptr<IPC::Encoder>&& encoder, IPC::Connection& connection' % (message.name))
            if len(send_parameters):
                result.append(', %s' % ', '.join([' '.join(x) for x in send_parameters]))
            result.append(')\n{\n')
            result += ['    *encoder << %s;\n' % x.name for x in message.reply_parameters]
            result.append('    connection.sendSyncReply(WTFMove(encoder));\n')
            result.append('}\n')
            result.append('\n')

            if message.condition:
                result.append('#endif\n\n')

        result.append('} // namespace %s\n\n} // namespace Messages\n\n' % receiver.name)

    result.append('namespace WebKit {\n\n')

    async_messages = []
    sync_messages = []
    for message in receiver.messages:
        if message.reply_parameters is not None and not message.has_attribute(ASYNC_ATTRIBUTE):
            sync_messages.append(message)
        else:
            async_messages.append(message)

    if async_messages:
        result.append('void %s::didReceive%sMessage(IPC::Connection& connection, IPC::Decoder& decoder)\n' % (receiver.name, receiver.name if receiver.has_attribute(LEGACY_RECEIVER_ATTRIBUTE) else ''))
        result.append('{\n')
        result += [async_message_statement(receiver, message) for message in async_messages]
        if (receiver.superclass):
            result.append('    %s::didReceiveMessage(connection, decoder);\n' % (receiver.superclass))
        else:
            result.append('    UNUSED_PARAM(connection);\n')
            result.append('    UNUSED_PARAM(decoder);\n')
            result.append('    ASSERT_NOT_REACHED();\n')
        result.append('}\n')

    if sync_messages:
        result.append('\n')
        result.append('void %s::didReceiveSync%sMessage(IPC::Connection& connection, IPC::Decoder& decoder, std::unique_ptr<IPC::Encoder>& replyEncoder)\n' % (receiver.name, receiver.name if receiver.has_attribute(LEGACY_RECEIVER_ATTRIBUTE) else ''))
        result.append('{\n')
        result += [sync_message_statement(receiver, message) for message in sync_messages]
        result.append('    UNUSED_PARAM(connection);\n')
        result.append('    UNUSED_PARAM(decoder);\n')
        result.append('    UNUSED_PARAM(replyEncoder);\n')
        result.append('    ASSERT_NOT_REACHED();\n')
        result.append('}\n')

    result.append('\n} // namespace WebKit\n\n')

    if receiver.condition:
        result.append('\n#endif // %s\n' % receiver.condition)

    return ''.join(result)
