C++ JSDOMGlobalObject类代码示例

bool ScriptGlobalObject::set(ScriptState* scriptState, const char* name, InjectedScriptHost* value)
{
    JSLockHolder lock(scriptState);
    JSDOMGlobalObject* globalObject = jsCast<JSDOMGlobalObject*>(scriptState->lexicalGlobalObject());
    globalObject->putDirect(scriptState->vm(), Identifier(scriptState, name), toJS(scriptState, globalObject, value));
    return handleException(scriptState);
}

PassRefPtr<JSLazyEventListener> createAttributeEventListener(Node* node, Attribute* attr)
{
    ASSERT(node);
    ASSERT(attr);
    if (attr->isNull())
        return 0;

    int lineNumber = 1;
    String sourceURL;
    JSObject* wrapper = 0;
    
    // FIXME: We should be able to provide accurate source information for frameless documents, too (e.g. for importing nodes from XMLHttpRequest.responseXML).
    if (Frame* frame = node->document()->frame()) {
        ScriptController* scriptController = frame->script();
        if (!scriptController->canExecuteScripts())
            return 0;

        if (!scriptController->xssAuditor()->canCreateInlineEventListener(attr->localName().string(), attr->value())) {
            // This script is not safe to execute.
            return 0;
        }

        lineNumber = scriptController->eventHandlerLineNumber();
        sourceURL = node->document()->url().string();

        JSC::JSLock lock(SilenceAssertionsOnly);
        JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(node->document(), mainThreadNormalWorld());
        wrapper = asObject(toJS(globalObject->globalExec(), globalObject, node));
    }

    return JSLazyEventListener::create(attr->localName().string(), eventParameterName(node->isSVGElement()), attr->value(), node, sourceURL, lineNumber, wrapper, mainThreadNormalWorld());
}

bool ScriptGlobalObject::set(ScriptState* scriptState, const char* name, InjectedScriptHost* value)
{
    JSLock lock(SilenceAssertionsOnly);
    JSDOMGlobalObject* globalObject = static_cast<JSDOMGlobalObject*>(scriptState->lexicalGlobalObject());
    globalObject->putDirect(scriptState->globalData(), Identifier(scriptState, name), toJS(scriptState, globalObject, value));
    return handleException(scriptState);
}

void injectInternalsObject(JSContextRef context)
{
    JSLock lock(SilenceAssertionsOnly);
    ExecState* exec = toJS(context);
    JSDOMGlobalObject* globalObject = static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject());
    globalObject->putDirect(exec->globalData(), Identifier(exec, "internals"), toJS(exec, globalObject, Internals::create()));
}

void setJSWorkerContextOnmessage(ExecState* exec, JSObject* thisObject, JSValue value)
{
    UNUSED_PARAM(exec);
    WorkerContext* imp = static_cast<WorkerContext*>(static_cast<JSWorkerContext*>(thisObject)->impl());
    JSDOMGlobalObject* globalObject = static_cast<JSWorkerContext*>(thisObject);
    imp->setOnmessage(globalObject->createJSAttributeEventListener(value));
}

ScriptObject InjectedScriptHost::createInjectedScript(const String& source, ScriptState* scriptState, long id)
{
    SourceCode sourceCode = makeSource(stringToUString(source));
    JSLock lock(SilenceAssertionsOnly);
    JSDOMGlobalObject* globalObject = static_cast<JSDOMGlobalObject*>(scriptState->lexicalGlobalObject());
    JSValue globalThisValue = scriptState->globalThisValue();
    Completion comp = JSMainThreadExecState::evaluate(scriptState, globalObject->globalScopeChain(), sourceCode, globalThisValue);
    if (comp.complType() != JSC::Normal && comp.complType() != JSC::ReturnValue)
        return ScriptObject();
    JSValue functionValue = comp.value();
    CallData callData;
    CallType callType = functionValue.getCallData(callData);
    if (callType == CallTypeNone)
        return ScriptObject();

    MarkedArgumentBuffer args;
    args.append(toJS(scriptState, globalObject, this));
    args.append(globalThisValue);
    args.append(jsNumber(scriptState, id));
    args.append(jsString(scriptState, String("JSC")));
    JSValue result = JSC::call(scriptState, functionValue, callType, callData, globalThisValue, args);
    if (result.isObject())
        return ScriptObject(scriptState, result.getObject());
    return ScriptObject();
}

void setJSWebSocketOnclose(ExecState* exec, JSObject* thisObject, JSValue value)
{
    UNUSED_PARAM(exec);
    WebSocket* imp = static_cast<WebSocket*>(static_cast<JSWebSocket*>(thisObject)->impl());
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(imp->scriptExecutionContext(), exec);
    if (!globalObject)
        return;
    imp->setOnclose(globalObject->createJSAttributeEventListener(value));
}

void setJSXMLHttpRequestOnreadystatechange(ExecState* exec, JSObject* thisObject, JSValue value)
{
    UNUSED_PARAM(exec);
    XMLHttpRequest* imp = static_cast<XMLHttpRequest*>(static_cast<JSXMLHttpRequest*>(thisObject)->impl());
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(imp->scriptExecutionContext(), exec);
    if (!globalObject)
        return;
    imp->setOnreadystatechange(globalObject->createJSAttributeEventListener(value));
}

JSObject* JSLazyEventListener::initializeJSFunction(ScriptExecutionContext* executionContext) const
{
    ASSERT(executionContext);
    ASSERT(executionContext->isDocument());
    if (!executionContext)
        return 0;

    Document* document = static_cast<Document*>(executionContext);

    if (!document->frame())
        return 0;

    if (!document->contentSecurityPolicy()->allowInlineEventHandlers())
        return 0;

    ScriptController* script = document->frame()->script();
    if (!script->canExecuteScripts(AboutToExecuteScript) || script->isPaused())
        return 0;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(executionContext, isolatedWorld());
    if (!globalObject)
        return 0;

    ExecState* exec = globalObject->globalExec();

    MarkedArgumentBuffer args;
    args.append(jsNontrivialString(exec, stringToUString(m_eventParameterName)));
    args.append(jsString(exec, m_code));

    JSObject* jsFunction = constructFunctionSkippingEvalEnabledCheck(exec, exec->lexicalGlobalObject(), args, Identifier(exec, stringToUString(m_functionName)), stringToUString(m_sourceURL), m_position); // FIXME: is globalExec ok?
    if (exec->hadException()) {
        reportCurrentException(exec);
        exec->clearException();
        return 0;
    }

    JSFunction* listenerAsFunction = jsCast<JSFunction*>(jsFunction);
    if (m_originalNode) {
        if (!wrapper()) {
            // Ensure that 'node' has a JavaScript wrapper to mark the event listener we're creating.
            JSLock lock(SilenceAssertionsOnly);
            // FIXME: Should pass the global object associated with the node
            setWrapper(exec->globalData(), asObject(toJS(exec, globalObject, m_originalNode)));
        }

        // Add the event's home element to the scope
        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)
        listenerAsFunction->setScope(exec->globalData(), jsCast<JSNode*>(wrapper())->pushEventHandlerScope(exec, listenerAsFunction->scope()));
    }

    // Since we only parse once, there's no need to keep data used for parsing around anymore.
    m_functionName = String();
    m_code = String();
    m_eventParameterName = String();
    m_sourceURL = String();
    return jsFunction;
}

JSValue* JSWorker::addEventListener(ExecState* exec, const ArgList& args)
{
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(impl()->scriptExecutionContext());
    if (!globalObject)
        return jsUndefined();
    RefPtr<JSUnprotectedEventListener> listener = globalObject->findOrCreateJSUnprotectedEventListener(exec, args.at(exec, 1));
    if (!listener)
        return jsUndefined();
    impl()->addEventListener(args.at(exec, 0)->toString(exec), listener.release(), args.at(exec, 2)->toBoolean(exec));
    return jsUndefined();
}

JSValue JSXMLHttpRequestUpload::addEventListener(ExecState* exec, const ArgList& args)
{
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(impl()->scriptExecutionContext());
    if (!globalObject)
        return jsUndefined();
    RefPtr<JSEventListener> listener = globalObject->findOrCreateJSEventListener(args.at(1));
    if (!listener)
        return jsUndefined();
    impl()->addEventListener(args.at(0).toString(exec), listener.release(), args.at(2).toBoolean(exec));
    return jsUndefined();
}

JSValuePtr JSNode::removeEventListener(ExecState* exec, const ArgList& args)
{
    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(impl()->scriptExecutionContext());
    if (!globalObject)
        return jsUndefined();

    if (JSEventListener* listener = globalObject->findJSEventListener(args.at(exec, 1)))
        impl()->removeEventListener(args.at(exec, 0).toString(exec), listener, args.at(exec, 2).toBoolean(exec));

    return jsUndefined();
}

void resetInternalsObject(JSContextRef context)
{
    JSLock lock(SilenceAssertionsOnly);
    ExecState* exec = toJS(context);
    JSDOMGlobalObject* globalObject = static_cast<JSDOMGlobalObject*>(exec->lexicalGlobalObject());
    Internals * internals = toInternals(globalObject->getDirect(exec->globalData(), Identifier(exec, Internals::internalsId)));
    if (internals) {
        ScriptExecutionContext* scriptContext = globalObject->scriptExecutionContext();
        if (scriptContext->isDocument())
            internals->reset(static_cast<Document*>(scriptContext));
    }
}

void reportException(ExecState* exec, JSValue exception, CachedScript* cachedScript)
{
    if (isTerminatedExecutionException(exception))
        return;

    Interpreter::ErrorHandlingMode mode(exec);

    RefPtr<ScriptCallStack> callStack(createScriptCallStackFromException(exec, exception, ScriptCallStack::maxCallStackSizeToCapture));
    exec->clearException();
    exec->clearSupplementaryExceptionInfo();

    JSDOMGlobalObject* globalObject = jsCast<JSDOMGlobalObject*>(exec->lexicalGlobalObject());
    if (JSDOMWindow* window = jsDynamicCast<JSDOMWindow*>(globalObject)) {
        if (!window->impl()->isCurrentlyDisplayedInFrame())
            return;
    }

    int lineNumber = 0;
    int columnNumber = 0;
    String exceptionSourceURL;
    if (callStack->size()) {
        const ScriptCallFrame& frame = callStack->at(0);
        lineNumber = frame.lineNumber();
        columnNumber = frame.columnNumber();
        exceptionSourceURL = frame.sourceURL();
    } else {
        // There may not be an exceptionStack for a <script> SyntaxError. Fallback to getting at least the line and sourceURL from the exception.
        JSObject* exceptionObject = exception.toObject(exec);
        JSValue lineValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "line"));
        lineNumber = lineValue && lineValue.isNumber() ? int(lineValue.toNumber(exec)) : 0;
        JSValue columnValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "column"));
        columnNumber = columnValue && columnValue.isNumber() ? int(columnValue.toNumber(exec)) : 0;
        JSValue sourceURLValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "sourceURL"));
        exceptionSourceURL = sourceURLValue && sourceURLValue.isString() ? sourceURLValue.toString(exec)->value(exec) : ASCIILiteral("undefined");
    }

    String errorMessage;
    if (ExceptionBase* exceptionBase = toExceptionBase(exception))
        errorMessage = exceptionBase->message() + ": "  + exceptionBase->description();
    else {
        // FIXME: <http://webkit.org/b/115087> Web Inspector: WebCore::reportException should not evaluate JavaScript handling exceptions
        // If this is a custon exception object, call toString on it to try and get a nice string representation for the exception.
        errorMessage = exception.toString(exec)->value(exec);
        exec->clearException();
        exec->clearSupplementaryExceptionInfo();
    }

    ScriptExecutionContext* scriptExecutionContext = globalObject->scriptExecutionContext();
    scriptExecutionContext->reportException(errorMessage, lineNumber, columnNumber, exceptionSourceURL, callStack->size() ? callStack : 0, cachedScript);
}

void HTMLPlugInImageElement::didAddUserAgentShadowRoot(ShadowRoot* root)
{
    HTMLPlugInElement::didAddUserAgentShadowRoot(root);
    if (displayState() >= PreparingPluginReplacement)
        return;

    Page* page = document().page();
    if (!page)
        return;

    // Reset any author styles that may apply as we only want explicit
    // styles defined in the injected user agents stylesheets to specify
    // the look-and-feel of the snapshotted plug-in overlay. 
    root->setResetStyleInheritance(true);
    
    String mimeType = loadedMimeType();

    DOMWrapperWorld& isolatedWorld = plugInImageElementIsolatedWorld();
    document().ensurePlugInsInjectedScript(isolatedWorld);

    ScriptController& scriptController = document().frame()->script();
    JSDOMGlobalObject* globalObject = JSC::jsCast<JSDOMGlobalObject*>(scriptController.globalObject(isolatedWorld));
    JSC::ExecState* exec = globalObject->globalExec();

    JSC::JSLockHolder lock(exec);

    JSC::MarkedArgumentBuffer argList;
    argList.append(toJS(exec, globalObject, root));
    argList.append(jsString(exec, titleText(page, mimeType)));
    argList.append(jsString(exec, subtitleText(page, mimeType)));
    
    // This parameter determines whether or not the snapshot overlay should always be visible over the plugin snapshot.
    // If no snapshot was found then we want the overlay to be visible.
    argList.append(JSC::jsBoolean(!m_snapshotImage));

    // It is expected the JS file provides a createOverlay(shadowRoot, title, subtitle) function.
    JSC::JSObject* overlay = globalObject->get(exec, JSC::Identifier::fromString(exec, "createOverlay")).toObject(exec);
    if (!overlay) {
        ASSERT(exec->hadException());
        exec->clearException();
        return;
    }
    JSC::CallData callData;
    JSC::CallType callType = overlay->methodTable()->getCallData(overlay, callData);
    if (callType == JSC::CallType::None)
        return;

    JSC::call(exec, overlay, callType, callData, globalObject, argList);
    exec->clearException();
}