C++ LocalDOMWindow::document方法代码示例

static void messageHandlerInMainThread(v8::Handle<v8::Message> message, v8::Handle<v8::Value> data)
{
    ASSERT(isMainThread());
    // It's possible that messageHandlerInMainThread() is invoked while we're initializing a window.
    // In that half-baked situation, we don't have a valid context nor a valid world,
    // so just return immediately.
    if (DOMWrapperWorld::windowIsBeingInitialized())
        return;

    v8::Isolate* isolate = v8::Isolate::GetCurrent();
    // If called during context initialization, there will be no entered window.
    LocalDOMWindow* enteredWindow = enteredDOMWindow(isolate);
    if (!enteredWindow)
        return;

    String errorMessage = toCoreString(message->Get());

    v8::Handle<v8::StackTrace> stackTrace = message->GetStackTrace();
    RefPtr<ScriptCallStack> callStack = nullptr;
    int scriptId = message->GetScriptOrigin().ScriptID()->Value();
    // Currently stack trace is only collected when inspector is open.
    if (!stackTrace.IsEmpty() && stackTrace->GetFrameCount() > 0) {
        callStack = createScriptCallStack(stackTrace, ScriptCallStack::maxCallStackSizeToCapture, isolate);
        bool success = false;
        int topScriptId = callStack->at(0).scriptId().toInt(&success);
        if (success && topScriptId == scriptId)
            scriptId = 0;
    } else {
        Vector<ScriptCallFrame> callFrames;
        callStack = ScriptCallStack::create(callFrames);
    }

    v8::Handle<v8::Value> resourceName = message->GetScriptOrigin().ResourceName();
    bool shouldUseDocumentURL = resourceName.IsEmpty() || !resourceName->IsString();
    String resource = shouldUseDocumentURL ? enteredWindow->document()->url() : toCoreString(resourceName.As<v8::String>());

    ScriptState* scriptState = ScriptState::current(isolate);
    RefPtr<ErrorEvent> event = ErrorEvent::create(errorMessage, resource, message->GetLineNumber(), message->GetStartColumn() + 1, &scriptState->world());
    if (V8DOMWrapper::isDOMWrapper(data)) {
        v8::Handle<v8::Object> obj = v8::Handle<v8::Object>::Cast(data);
        const WrapperTypeInfo* type = toWrapperTypeInfo(obj);
        if (V8DOMException::wrapperTypeInfo.isSubclass(type)) {
            DOMException* exception = V8DOMException::toNative(obj);
            if (exception && !exception->messageForConsole().isEmpty())
                event->setUnsanitizedMessage("Uncaught " + exception->toStringForConsole());
        }
    }

    // This method might be called while we're creating a new context. In this case, we
    // avoid storing the exception object, as we can't create a wrapper during context creation.
    // FIXME: Can we even get here during initialization now that we bail out when GetEntered returns an empty handle?
    LocalFrame* frame = enteredWindow->document()->frame();
    if (frame && frame->script().existingWindowProxy(scriptState->world())) {
        V8ErrorHandler::storeExceptionOnErrorEventWrapper(event.get(), data, scriptState->context()->Global(), isolate);
    }

    enteredWindow->document()->reportException(event.release(), scriptId, callStack);
}

static void messageHandlerInMainThread(v8::Local<v8::Message> message, v8::Local<v8::Value> data)
{
    ASSERT(isMainThread());
    v8::Isolate* isolate = v8::Isolate::GetCurrent();
    // If called during context initialization, there will be no entered window.
    LocalDOMWindow* enteredWindow = enteredDOMWindow(isolate);
    if (!enteredWindow || !enteredWindow->isCurrentlyDisplayedInFrame())
        return;

    int scriptId = 0;
    RefPtrWillBeRawPtr<ScriptCallStack> callStack = extractCallStack(isolate, message, &scriptId);
    String resourceName = extractResourceName(message, enteredWindow->document());
    AccessControlStatus accessControlStatus = NotSharableCrossOrigin;
    if (message->IsOpaque())
        accessControlStatus = OpaqueResource;
    else if (message->IsSharedCrossOrigin())
        accessControlStatus = SharableCrossOrigin;

    ScriptState* scriptState = ScriptState::current(isolate);
    String errorMessage = toCoreStringWithNullCheck(message->Get());
    int lineNumber = 0;
    int columnNumber = 0;
    if (v8Call(message->GetLineNumber(scriptState->context()), lineNumber)
        && v8Call(message->GetStartColumn(scriptState->context()), columnNumber))
        ++columnNumber;
    RefPtrWillBeRawPtr<ErrorEvent> event = ErrorEvent::create(errorMessage, resourceName, lineNumber, columnNumber, &scriptState->world());

    String messageForConsole = extractMessageForConsole(isolate, data);
    if (!messageForConsole.isEmpty())
        event->setUnsanitizedMessage("Uncaught " + messageForConsole);

    // This method might be called while we're creating a new context. In this case, we
    // avoid storing the exception object, as we can't create a wrapper during context creation.
    // FIXME: Can we even get here during initialization now that we bail out when GetEntered returns an empty handle?
    LocalFrame* frame = enteredWindow->document()->frame();
    if (frame && frame->script().existingWindowProxy(scriptState->world())) {
        V8ErrorHandler::storeExceptionOnErrorEventWrapper(isolate, event.get(), data, scriptState->context()->Global());
    }

    if (scriptState->world().isPrivateScriptIsolatedWorld()) {
        // We allow a private script to dispatch error events even in a EventDispatchForbiddenScope scope.
        // Without having this ability, it's hard to debug the private script because syntax errors
        // in the private script are not reported to console (the private script just crashes silently).
        // Allowing error events in private scripts is safe because error events don't propagate to
        // other isolated worlds (which means that the error events won't fire any event listeners
        // in user's scripts).
        EventDispatchForbiddenScope::AllowUserAgentEvents allowUserAgentEvents;
        enteredWindow->document()->reportException(event.release(), scriptId, callStack, accessControlStatus);
    } else {
        enteredWindow->document()->reportException(event.release(), scriptId, callStack, accessControlStatus);
    }
}

static void promiseRejectHandlerInMainThread(v8::PromiseRejectMessage data)
{
    ASSERT(isMainThread());

    v8::Local<v8::Promise> promise = data.GetPromise();

    v8::Isolate* isolate = promise->GetIsolate();
    // There is no entered window during microtask callbacks from V8,
    // thus we call toDOMWindow() instead of enteredDOMWindow().
    LocalDOMWindow* window = currentDOMWindow(isolate);
    if (!window || !window->isCurrentlyDisplayedInFrame())
        return;

    promiseRejectHandler(data, rejectedPromisesOnMainThread(), window->document() ? window->document()->url() : String());
}

static void promiseRejectHandlerInMainThread(v8::PromiseRejectMessage data)
{
    ASSERT(isMainThread());
    if (data.GetEvent() == v8::kPromiseHandlerAddedAfterReject) {
        rejectedPromisesOnMainThread().handlerAdded(data);
        return;
    }

    ASSERT(data.GetEvent() == v8::kPromiseRejectWithNoHandler);

    v8::Local<v8::Promise> promise = data.GetPromise();

    v8::Isolate* isolate = promise->GetIsolate();
    // There is no entered window during microtask callbacks from V8,
    // thus we call toDOMWindow() instead of enteredDOMWindow().
    LocalDOMWindow* window = currentDOMWindow(isolate);
    if (!window || !window->isCurrentlyDisplayedInFrame())
        return;

    v8::Local<v8::Value> exception = data.GetValue();
    if (V8DOMWrapper::isWrapper(isolate, exception)) {
        // Try to get the stack & location from a wrapped exception object (e.g. DOMException).
        ASSERT(exception->IsObject());
        v8::Local<v8::Object> obj = v8::Local<v8::Object>::Cast(exception);
        v8::Local<v8::Value> error = V8HiddenValue::getHiddenValue(isolate, obj, V8HiddenValue::error(isolate));
        if (!error.IsEmpty())
            exception = error;
    }

    int scriptId = 0;
    int lineNumber = 0;
    int columnNumber = 0;
    String resourceName;
    String errorMessage;
    RefPtrWillBeRawPtr<ScriptCallStack> callStack = nullptr;

    v8::Local<v8::Message> message = v8::Exception::CreateMessage(exception);
    if (!message.IsEmpty()) {
        if (v8Call(message->GetLineNumber(isolate->GetCurrentContext()), lineNumber)
            && v8Call(message->GetStartColumn(isolate->GetCurrentContext()), columnNumber))
            ++columnNumber;
        resourceName = extractResourceName(message, window->document());
        errorMessage = toCoreStringWithNullCheck(message->Get());
        callStack = extractCallStack(isolate, message, &scriptId);
    } else if (!exception.IsEmpty() && exception->IsInt32()) {
        // For Smi's the message would be empty.
        errorMessage = "Uncaught " + String::number(exception.As<v8::Integer>()->Value());
    }

    String messageForConsole = extractMessageForConsole(isolate, data.GetValue());
    if (!messageForConsole.isEmpty())
        errorMessage = "Uncaught " + messageForConsole;

    ScriptState* scriptState = ScriptState::current(isolate);
    rejectedPromisesOnMainThread().rejectedWithNoHandler(scriptState, data, errorMessage, resourceName, scriptId, lineNumber, columnNumber, callStack);
}

 PostMessageTimer(LocalDOMWindow& window, PassRefPtrWillBeRawPtr<MessageEvent> event, PassRefPtrWillBeRawPtr<LocalDOMWindow> source, SecurityOrigin* targetOrigin, PassRefPtrWillBeRawPtr<ScriptCallStack> stackTrace, UserGestureToken* userGestureToken)
     : SuspendableTimer(window.document())
     , m_event(event)
     , m_window(&window)
     , m_targetOrigin(targetOrigin)
     , m_stackTrace(stackTrace)
     , m_userGestureToken(userGestureToken)
     , m_preventDestruction(false)
 {
     m_asyncOperationId = InspectorInstrumentation::traceAsyncOperationStarting(executionContext(), "postMessage");
 }

void V8HTMLElement::HTMLConstructor(
    const v8::FunctionCallbackInfo<v8::Value>& info) {
  DCHECK(info.IsConstructCall());

  v8::Isolate* isolate = info.GetIsolate();
  ScriptState* scriptState = ScriptState::current(isolate);

  if (!RuntimeEnabledFeatures::customElementsV1Enabled() ||
      !scriptState->world().isMainWorld()) {
    V8ThrowException::throwTypeError(info.GetIsolate(), "Illegal constructor");
    return;
  }

  LocalDOMWindow* window = scriptState->domWindow();
  ScriptCustomElementDefinition* definition =
      ScriptCustomElementDefinition::forConstructor(
          scriptState, window->customElements(), info.NewTarget());
  if (!definition) {
    V8ThrowException::throwTypeError(isolate, "Illegal constructor");
    return;
  }

  ExceptionState exceptionState(ExceptionState::ConstructionContext,
                                "HTMLElement", info.Holder(), isolate);

  Element* element;
  if (definition->constructionStack().isEmpty()) {
    // This is an element being created with 'new' from script
    element = definition->createElementForConstructor(*window->document());
  } else {
    element = definition->constructionStack().last();
    if (element) {
      // This is an element being upgraded that has called super
      definition->constructionStack().last().clear();
    } else {
      // During upgrade an element has invoked the same constructor
      // before calling 'super' and that invocation has poached the
      // element.
      exceptionState.throwDOMException(InvalidStateError,
                                       "this instance is already constructed");
      return;
    }
  }
  const WrapperTypeInfo* wrapperType = element->wrapperTypeInfo();
  v8::Local<v8::Object> wrapper = V8DOMWrapper::associateObjectWithWrapper(
      isolate, element, wrapperType, info.Holder());
  // If the element had a wrapper, we now update and return that
  // instead.
  v8SetReturnValue(info, wrapper);

  wrapper->SetPrototype(scriptState->context(), definition->prototype())
      .ToChecked();
}

void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble, bool cancelable, const WebSerializedScriptValue& messageData, const WebString& origin, const WebFrame* sourceFrame, const WebString& lastEventId, const WebMessagePortChannelArray& webChannels)
{
    ASSERT(m_private.get());
    ASSERT(isMessageEvent());
    LocalDOMWindow* window = 0;
    if (sourceFrame)
        window = toWebLocalFrameImpl(sourceFrame)->frame()->domWindow();
    OwnPtr<MessagePortArray> ports;
    if (sourceFrame)
        ports = MessagePort::toMessagePortArray(window->document(), webChannels);
    unwrap<MessageEvent>()->initMessageEvent(type, canBubble, cancelable, messageData, origin, lastEventId, window, ports.release());
}

void DevToolsHost::showContextMenu(Event* event, const Vector<ContextMenuItem>& items)
{
    if (!event)
        return;

    ASSERT(m_frontendFrame);
    ScriptState* frontendScriptState = ScriptState::forMainWorld(m_frontendFrame);
    ScriptValue devtoolsApiObject = frontendScriptState->getFromGlobalObject("DevToolsAPI");
    ASSERT(devtoolsApiObject.isObject());

    Page* targetPage = m_frontendFrame->page();
    if (event->target() && event->target()->executionContext() && event->target()->executionContext()->executingWindow()) {
        LocalDOMWindow* window = event->target()->executionContext()->executingWindow();
        if (window->document() && window->document()->page())
            targetPage = window->document()->page();
    }

    RefPtrWillBeRawPtr<FrontendMenuProvider> menuProvider = FrontendMenuProvider::create(this, devtoolsApiObject, items);
    targetPage->contextMenuController().showContextMenu(event, menuProvider);
    m_menuProvider = menuProvider.get();
}

void DOMWindowFileSystem::webkitRequestFileSystem(LocalDOMWindow& window, int type, long long size, PassOwnPtr<FileSystemCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
{
    if (!window.isCurrentlyDisplayedInFrame())
        return;

    Document* document = window.document();
    if (!document)
        return;

    if (!document->securityOrigin()->canAccessFileSystem()) {
        DOMFileSystem::scheduleCallback(document, errorCallback, FileError::create(FileError::SECURITY_ERR));
        return;
    }

    FileSystemType fileSystemType = static_cast<FileSystemType>(type);
    if (!DOMFileSystemBase::isValidType(fileSystemType)) {
        DOMFileSystem::scheduleCallback(document, errorCallback, FileError::create(FileError::INVALID_MODIFICATION_ERR));
        return;
    }

    LocalFileSystem::from(*document)->requestFileSystem(document, fileSystemType, size, FileSystemCallbacks::create(successCallback, errorCallback, document, fileSystemType));
}

void DOMWindowFileSystem::webkitResolveLocalFileSystemURL(LocalDOMWindow& window, const String& url, PassOwnPtr<EntryCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
{
    if (!window.isCurrentlyDisplayedInFrame())
        return;

    Document* document = window.document();
    if (!document)
        return;

    SecurityOrigin* securityOrigin = document->securityOrigin();
    KURL completedURL = document->completeURL(url);
    if (!securityOrigin->canAccessFileSystem() || !securityOrigin->canRequest(completedURL)) {
        DOMFileSystem::scheduleCallback(document, errorCallback, FileError::create(FileError::SECURITY_ERR));
        return;
    }

    if (!completedURL.isValid()) {
        DOMFileSystem::scheduleCallback(document, errorCallback, FileError::create(FileError::ENCODING_ERR));
        return;
    }

    LocalFileSystem::from(*document)->resolveURL(document, completedURL, ResolveURICallbacks::create(successCallback, errorCallback, document));
}

//.........这里部分代码省略.........
  if (newTarget == activeFunctionObject) {
    V8ThrowException::throwTypeError(isolate, "Illegal constructor");
    return;
  }

  LocalDOMWindow* window = scriptState->domWindow();
  CustomElementRegistry* registry = window->customElements();

  // 3. Let definition be the entry in registry with constructor equal to
  // NewTarget.
  // If there is no such definition, then throw a TypeError and abort these
  // steps.
  ScriptCustomElementDefinition* definition =
      ScriptCustomElementDefinition::forConstructor(scriptState, registry,
                                                    newTarget);
  if (!definition) {
    V8ThrowException::throwTypeError(isolate, "Illegal constructor");
    return;
  }

  const AtomicString& localName = definition->descriptor().localName();
  const AtomicString& name = definition->descriptor().name();

  if (localName == name) {
    // Autonomous custom element
    // 4.1. If the active function object is not HTMLElement, then throw a
    // TypeError
    if (!V8HTMLElement::wrapperTypeInfo.equals(&wrapperTypeInfo)) {
      V8ThrowException::throwTypeError(isolate,
                                       "Illegal constructor: autonomous custom "
                                       "elements must extend HTMLElement");
      return;
    }
  } else {
    // Customized built-in element
    // 5. If local name is not valid for interface, throw TypeError
    if (htmlElementTypeForTag(localName) != elementInterfaceName) {
      V8ThrowException::throwTypeError(isolate,
                                       "Illegal constructor: localName does "
                                       "not match the HTML element interface");
      return;
    }
  }

  ExceptionState exceptionState(isolate, ExceptionState::ConstructionContext,
                                "HTMLElement");
  v8::TryCatch tryCatch(isolate);

  // 6. Let prototype be Get(NewTarget, "prototype"). Rethrow any exceptions.
  v8::Local<v8::Value> prototype;
  v8::Local<v8::String> prototypeString = v8AtomicString(isolate, "prototype");
  if (!v8Call(newTarget.As<v8::Object>()->Get(scriptState->context(),
                                              prototypeString),
              prototype)) {
    return;
  }

  // 7. If Type(prototype) is not Object, then: ...
  if (!prototype->IsObject()) {
    if (V8PerContextData* perContextData = V8PerContextData::from(
            newTarget.As<v8::Object>()->CreationContext())) {
      prototype =
          perContextData->prototypeForType(&V8HTMLElement::wrapperTypeInfo);
    } else {
      V8ThrowException::throwError(isolate, "The context has been destroyed");
      return;
    }
  }

  // 8. If definition's construction stack is empty...
  Element* element;
  if (definition->constructionStack().isEmpty()) {
    // This is an element being created with 'new' from script
    element = definition->createElementForConstructor(*window->document());
  } else {
    element = definition->constructionStack().last();
    if (element) {
      // This is an element being upgraded that has called super
      definition->constructionStack().last().clear();
    } else {
      // During upgrade an element has invoked the same constructor
      // before calling 'super' and that invocation has poached the
      // element.
      exceptionState.throwDOMException(InvalidStateError,
                                       "this instance is already constructed");
      return;
    }
  }
  const WrapperTypeInfo* wrapperType = element->wrapperTypeInfo();
  v8::Local<v8::Object> wrapper = V8DOMWrapper::associateObjectWithWrapper(
      isolate, element, wrapperType, info.Holder());
  // If the element had a wrapper, we now update and return that
  // instead.
  v8SetReturnValue(info, wrapper);

  // 11. Perform element.[[SetPrototypeOf]](prototype). Rethrow any exceptions.
  // Note: I don't think this prototype set *can* throw exceptions.
  wrapper->SetPrototype(scriptState->context(), prototype.As<v8::Object>())
      .ToChecked();
}