JSValue ScriptController::executeScript(const ScriptSourceCode& sourceCode, ExceptionDetails* exceptionDetails)
{
    if (!canExecuteScripts(AboutToExecuteScript) || isPaused())
        return { }; // FIXME: Would jsNull be better?

    Ref<Frame> protect(m_frame); // Script execution can destroy the frame, and thus the ScriptController.

    return evaluate(sourceCode, exceptionDetails);
}

ScriptValue ScriptController::executeScriptInWorld(DOMWrapperWorld* world, const String& script, bool forceUserGesture)
{
    UserGestureIndicator gestureIndicator(forceUserGesture ? DefinitelyProcessingUserGesture : PossiblyProcessingUserGesture);
    ScriptSourceCode sourceCode(script, m_frame->document()->url());

    if (!canExecuteScripts(AboutToExecuteScript) || isPaused())
        return ScriptValue();

    return evaluateInWorld(sourceCode, world);
}

JSValue ScriptController::executeScriptInWorld(DOMWrapperWorld& world, const String& script, bool forceUserGesture)
{
    UserGestureIndicator gestureIndicator(forceUserGesture ? Optional<ProcessingUserGestureState>(ProcessingUserGesture) : Nullopt);
    ScriptSourceCode sourceCode(script, m_frame.document()->url());

    if (!canExecuteScripts(AboutToExecuteScript) || isPaused())
        return { };

    return evaluateInWorld(sourceCode, world);
}

Bindings::RootObject* ScriptController::bindingRootObject()
{
    if (!canExecuteScripts(NotAboutToExecuteScript))
        return 0;

    if (!m_bindingRootObject) {
        JSLock lock(SilenceAssertionsOnly);
        m_bindingRootObject = Bindings::RootObject::create(0, globalObject(pluginWorld()));
    }
    return m_bindingRootObject.get();
}

JSObject* ScriptController::jsObjectForPluginElement(HTMLPlugInElement* plugin)
{
    // Can't create JSObjects when JavaScript is disabled
    if (!canExecuteScripts(NotAboutToExecuteScript))
        return 0;

    // Create a JSObject bound to this element
    JSLock lock(SilenceAssertionsOnly);
    JSDOMWindow* globalObj = globalObject(pluginWorld());
    // FIXME: is normal okay? - used for NP plugins?
    JSValue jsElementValue = toJS(globalObj->globalExec(), globalObj, plugin);
    if (!jsElementValue || !jsElementValue.isObject())
        return 0;
    
    return jsElementValue.getObject();
}

ScriptValue ScriptController::executeScript(const ScriptSourceCode& sourceCode)
{
    if (!canExecuteScripts(AboutToExecuteScript) || isPaused())
        return ScriptValue();

    bool wasInExecuteScript = m_inExecuteScript;
    m_inExecuteScript = true;

    ScriptValue result = evaluate(sourceCode);

    if (!wasInExecuteScript) {
        m_inExecuteScript = false;
        Document::updateStyleForAllDocuments();
    }

    return result;
}

NPObject* ScriptController::windowScriptNPObject()
{
    if (m_windowScriptNPObject)
        return m_windowScriptNPObject;

    if (canExecuteScripts()) {
        // JavaScript is enabled, so there is a JavaScript window object.
        // Return an NPObject bound to the window object.
        m_windowScriptNPObject = createScriptObject(m_frame);
        _NPN_RegisterObject(m_windowScriptNPObject, 0);
    } else {
        // JavaScript is not enabled, so we cannot bind the NPObject to the
        // JavaScript window object. Instead, we create an NPObject of a
        // different class, one which is not bound to a JavaScript object.
        m_windowScriptNPObject = createNoScriptObject();
    }
    return m_windowScriptNPObject;
}

NPObject* ScriptController::createScriptObjectForPluginElement(HTMLPlugInElement* plugin)
{
    // Can't create NPObjects when JavaScript is disabled.
    if (!canExecuteScripts())
        return createNoScriptObject();

    v8::HandleScope handleScope;
    v8::Handle<v8::Context> v8Context = V8Proxy::mainWorldContext(m_frame);
    if (v8Context.IsEmpty())
        return createNoScriptObject();
    v8::Context::Scope scope(v8Context);

    DOMWindow* window = m_frame->domWindow();
    v8::Handle<v8::Value> v8plugin = toV8(static_cast<HTMLEmbedElement*>(plugin));
    if (!v8plugin->IsObject())
        return createNoScriptObject();

    return npCreateV8ScriptObject(0, v8::Handle<v8::Object>::Cast(v8plugin), window);
}

ScriptValue ScriptController::executeScript(const ScriptSourceCode& sourceCode)
{
    if (!canExecuteScripts(AboutToExecuteScript) || isPaused())
        return ScriptValue();

    bool wasInExecuteScript = m_inExecuteScript;
    m_inExecuteScript = true;

    RefPtr<Frame> protect(m_frame); // Script execution can destroy the frame, and thus the ScriptController.

    ScriptValue result = evaluate(sourceCode);

    if (!wasInExecuteScript) {
        m_inExecuteScript = false;
        Document::updateStyleForAllDocuments();
    }

    return result;
}

NPObject* ScriptController::windowScriptNPObject()
{
    if (!m_windowScriptNPObject) {
        if (canExecuteScripts(NotAboutToExecuteScript)) {
            // JavaScript is enabled, so there is a JavaScript window object.
            // Return an NPObject bound to the window object.
            JSC::JSLock lock(SilenceAssertionsOnly);
            JSObject* win = windowShell(pluginWorld())->window();
            ASSERT(win);
            Bindings::RootObject* root = bindingRootObject();
            m_windowScriptNPObject = _NPN_CreateScriptObject(0, win, root);
        } else {
            // JavaScript is not enabled, so we cannot bind the NPObject to the JavaScript window object.
            // Instead, we create an NPObject of a different class, one which is not bound to a JavaScript object.
            m_windowScriptNPObject = _NPN_CreateNoScriptObject();
        }
    }

    return m_windowScriptNPObject;
}