C++ jsc::JSValue类代码示例

JSC::JSValue ScriptModuleLoader::evaluate(JSC::JSGlobalObject*, JSC::ExecState* exec, JSC::JSModuleLoader*, JSC::JSValue moduleKeyValue, JSC::JSValue moduleRecordValue, JSC::JSValue)
{
    JSC::VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    // FIXME: Currently, we only support JSModuleRecord.
    // Once the reflective part of the module loader is supported, we will handle arbitrary values.
    // https://whatwg.github.io/loader/#registry-prototype-provide
    auto* moduleRecord = jsDynamicDowncast<JSC::JSModuleRecord*>(moduleRecordValue);
    if (!moduleRecord)
        return JSC::jsUndefined();

    URL sourceURL;
    if (moduleKeyValue.isSymbol())
        sourceURL = m_document.url();
    else if (moduleKeyValue.isString())
        sourceURL = URL(URL(), asString(moduleKeyValue)->value(exec));
    else
        return JSC::throwTypeError(exec, scope, ASCIILiteral("Module key is not Symbol or String."));

    if (!sourceURL.isValid())
        return JSC::throwTypeError(exec, scope, ASCIILiteral("Module key is an invalid URL."));

    if (auto* frame = m_document.frame())
        return frame->script().evaluateModule(sourceURL, *moduleRecord);
    return JSC::jsUndefined();
}

PassRefPtr<ScriptCallStack> createScriptCallStackFromException(JSC::ExecState* exec, JSC::JSValue& exception, size_t maxStackSize)
{
    Vector<ScriptCallFrame> frames;
    RefCountedArray<StackFrame> stackTrace = exec->vm().exceptionStack();
    for (size_t i = 0; i < stackTrace.size() && i < maxStackSize; i++) {
        if (!stackTrace[i].callee && frames.size())
            break;

        String functionName = stackTrace[i].friendlyFunctionName(exec);
        unsigned line;
        unsigned column;
        stackTrace[i].computeLineAndColumn(line, column);
        frames.append(ScriptCallFrame(functionName, stackTrace[i].sourceURL, line, column));
    }

    // FIXME: <http://webkit.org/b/115087> Web Inspector: WebCore::reportException should not evaluate JavaScript handling exceptions
    // Fallback to getting at least the line and sourceURL from the exception if it has values and the exceptionStack doesn't.
    if (frames.size() > 0) {
        const ScriptCallFrame& firstCallFrame = frames.first();
        JSObject* exceptionObject = exception.toObject(exec);
        if (exception.isObject() && firstCallFrame.sourceURL().isEmpty()) {
            JSValue lineValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "line"));
            int lineNumber = lineValue && lineValue.isNumber() ? int(lineValue.toNumber(exec)) : 0;
            JSValue sourceURLValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "sourceURL"));
            String exceptionSourceURL = sourceURLValue && sourceURLValue.isString() ? sourceURLValue.toString(exec)->value(exec) : ASCIILiteral("undefined");
            frames[0] = ScriptCallFrame(firstCallFrame.functionName(), exceptionSourceURL, lineNumber, 0);
        }
    }

    return ScriptCallStack::create(frames);
}

String DragData::asURL(String* /*title*/) const
{
    JSC::JSLock lock(false);
    bool success;
    JSC::JSValue data = m_platformDragData->getData(ClipboardApolloHelper::URI_LIST_TYPE, success);
    if (success && data.isString())
        return String(ustringToString(data.toString(m_platformDragData->execState())));
    return String();
}

wxString wxWebFrame::RunScript(const wxString& javascript)
{
    wxString returnValue = wxEmptyString;
    if (m_impl->frame) {
        JSC::JSValue result = m_impl->frame->loader()->executeScript(javascript, true).jsValue();
        if (result)
            returnValue = wxString(result.toString(m_impl->frame->script()->globalObject()->globalExec()).UTF8String().c_str(), wxConvUTF8);        
    }
    return returnValue;
}

/*!
  Returns the `this' object associated with this QScriptContext.
*/
QScriptValue QScriptContext::thisObject() const
{
    JSC::CallFrame *frame = const_cast<JSC::ExecState*>(QScriptEnginePrivate::frameForContext(this));
    QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
    QScript::APIShim shim(engine);
    JSC::JSValue result = engine->thisForContext(frame);
    if (!result || result.isNull())
        result = frame->globalThisValue();
    return engine->scriptValueFromJSCValue(result);
}

PassRefPtr<IDBKey> createIDBKeyFromValue(JSC::ExecState* exec, JSC::JSValue value)
{
    if (value.isNull())
        return IDBKey::create();
    if (value.isInt32())
        return IDBKey::create(value.toInt32(exec));
    if (value.isString())
        return IDBKey::create(ustringToString(value.toString(exec)));
    // FIXME: Implement dates.
    return 0;
}

JSValue WebInjectedScriptHost::type(JSC::ExecState* exec, JSC::JSValue value)
{
    if (value.inherits(JSNode::info()))
        return jsNontrivialString(exec, ASCIILiteral("node"));
    if (value.inherits(JSNodeList::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));
    if (value.inherits(JSHTMLCollection::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));

    return jsUndefined();
}

PassRefPtr<JSCustomXPathNSResolver> JSCustomXPathNSResolver::create(JSC::ExecState* exec, JSC::JSValue value)
{
    if (value.isUndefinedOrNull())
        return 0;

    JSObject* resolverObject = value.getObject();
    if (!resolverObject) {
        setDOMException(exec, TYPE_MISMATCH_ERR);
        return 0;
    }

    return adoptRef(new JSCustomXPathNSResolver(resolverObject, asJSDOMWindow(exec->dynamicGlobalObject())));
}

JSValue WebInjectedScriptHost::subtype(JSC::ExecState* exec, JSC::JSValue value)
{
    if (value.inherits(JSNode::info()))
        return jsNontrivialString(exec, ASCIILiteral("node"));
    if (value.inherits(JSNodeList::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));
    if (value.inherits(JSHTMLCollection::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));

    DOM_EXCEPTION_INTERFACES_FOR_EACH(RETURN_ERROR_IF_VALUE_INHERITS_EXCEPTION_TYPE)

    return jsUndefined();
}

ExceptionOr<Ref<FontFace>> FontFace::create(JSC::ExecState& state, Document& document, const String& family, JSC::JSValue source, const Descriptors& descriptors)
{
    auto result = adoptRef(*new FontFace(document.fontSelector()));

    bool dataRequiresAsynchronousLoading = true;

    auto setFamilyResult = result->setFamily(family);
    if (setFamilyResult.hasException())
        return setFamilyResult.releaseException();

    if (source.isString()) {
        auto value = FontFace::parseString(source.getString(&state), CSSPropertySrc);
        if (!is<CSSValueList>(value.get()))
            return Exception { SYNTAX_ERR };
        CSSFontFace::appendSources(result->backing(), downcast<CSSValueList>(*value), &document, false);
    } else if (auto arrayBufferView = toUnsharedArrayBufferView(source))
        dataRequiresAsynchronousLoading = populateFontFaceWithArrayBuffer(result->backing(), arrayBufferView.releaseNonNull());
    else if (auto arrayBuffer = toUnsharedArrayBuffer(source)) {
        auto arrayBufferView = JSC::Uint8Array::create(arrayBuffer, 0, arrayBuffer->byteLength());
        dataRequiresAsynchronousLoading = populateFontFaceWithArrayBuffer(result->backing(), arrayBufferView.releaseNonNull());
    }

    // These ternaries match the default strings inside the FontFaceDescriptors dictionary inside FontFace.idl.
    auto setStyleResult = result->setStyle(descriptors.style.isEmpty() ? ASCIILiteral("normal") : descriptors.style);
    if (setStyleResult.hasException())
        return setStyleResult.releaseException();
    auto setWeightResult = result->setWeight(descriptors.weight.isEmpty() ? ASCIILiteral("normal") : descriptors.weight);
    if (setWeightResult.hasException())
        return setWeightResult.releaseException();
    auto setStretchResult = result->setStretch(descriptors.stretch.isEmpty() ? ASCIILiteral("normal") : descriptors.stretch);
    if (setStretchResult.hasException())
        return setStretchResult.releaseException();
    auto setUnicodeRangeResult = result->setUnicodeRange(descriptors.unicodeRange.isEmpty() ? ASCIILiteral("U+0-10FFFF") : descriptors.unicodeRange);
    if (setUnicodeRangeResult.hasException())
        return setUnicodeRangeResult.releaseException();
    auto setVariantResult = result->setVariant(descriptors.variant.isEmpty() ? ASCIILiteral("normal") : descriptors.variant);
    if (setVariantResult.hasException())
        return setVariantResult.releaseException();
    auto setFeatureSettingsResult = result->setFeatureSettings(descriptors.featureSettings.isEmpty() ? ASCIILiteral("normal") : descriptors.featureSettings);
    if (setFeatureSettingsResult.hasException())
        return setFeatureSettingsResult.releaseException();

    if (!dataRequiresAsynchronousLoading) {
        result->backing().load();
        ASSERT(result->backing().status() == CSSFontFace::Status::Success);
    }

    return WTFMove(result);
}

void fillMessagePortArray(JSC::ExecState* exec, JSC::JSValue value, MessagePortArray& portArray)
{
    // Convert from the passed-in JS array-like object to a MessagePortArray.
    // Also validates the elements per sections 4.1.13 and 4.1.15 of the WebIDL spec and section 8.3.3 of the HTML5 spec.
    if (value.isUndefinedOrNull()) {
        portArray.resize(0);
        return;
    }

    // Validation of sequence types, per WebIDL spec 4.1.13.
    unsigned length;
    JSObject* object = toJSSequence(exec, value, length);
    if (exec->hadException())
        return;

    portArray.resize(length);
    for (unsigned i = 0 ; i < length; ++i) {
        JSValue value = object->get(exec, i);
        if (exec->hadException())
            return;
        // Validation of non-null objects, per HTML5 spec 8.3.3.
        if (value.isUndefinedOrNull()) {
            setDOMException(exec, INVALID_STATE_ERR);
            return;
        }

        // Validation of Objects implementing an interface, per WebIDL spec 4.1.15.
        RefPtr<MessagePort> port = toMessagePort(value);
        if (!port) {
            throwTypeError(exec);
            return;
        }
        portArray[i] = port.release();
    }
}

bool toVector(JSC::ExecState* exec, JSC::JSValue value, Vector<T, inlineCapacity>& vector)
{
    if (!value.isObject())
        return false;

    JSC::JSObject* object = asObject(value);
    int32_t length = object->get(exec, JSC::Identifier(exec, "length")).toInt32(exec);
    vector.resize(length);

    for (int32_t i = 0; i < length; ++i) {
        JSC::JSValue v = object->get(exec, i);
        if (exec->hadException())
            return false;
        vector[i] = static_cast<T>(v.toNumber(exec));
    }

    return true;
}

bool toVector(JSC::ExecState& state, JSC::JSValue value, Vector<T, inlineCapacity>& vector)
{
    if (!value.isObject())
        return false;
    
    JSC::JSObject* object = asObject(value);
    int32_t length = object->get(&state, state.vm().propertyNames->length).toInt32(&state);
    
    if (!vector.tryReserveCapacity(length))
        return false;
    vector.resize(length);
    
    for (int32_t i = 0; i < length; ++i) {
        JSC::JSValue v = object->get(&state, i);
        if (state.hadException())
            return false;
        vector[i] = static_cast<T>(v.toNumber(&state));
    }
    
    return true;
}

static JSC::JSValue JSC_HOST_CALL variantProtoFuncToString(JSC::ExecState *exec, JSC::JSObject *callee,
                                                           JSC::JSValue thisValue, const JSC::ArgList &args)
{
    QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
    thisValue = engine->toUsableValue(thisValue);
    if (!thisValue.inherits(&QScriptObject::info))
        return throwError(exec, JSC::TypeError, "This object is not a QVariant");
    QScriptObjectDelegate *delegate = static_cast<QScriptObject*>(JSC::asObject(thisValue))->delegate();
    if (!delegate || (delegate->type() != QScriptObjectDelegate::Variant))
        return throwError(exec, JSC::TypeError, "This object is not a QVariant");
    const QVariant &v = static_cast<QVariantDelegate*>(delegate)->value();
    JSC::UString result;
    JSC::JSValue value = variantProtoFuncValueOf(exec, callee, thisValue, args);
    if (value.isObject()) {
        result = v.toString();
        if (result.isEmpty() && !v.canConvert(QVariant::String))
            result = QString::fromLatin1("QVariant(%0)").arg(QString::fromLatin1(v.typeName()));
    } else {
        result = value.toString(exec);
    }
    return JSC::jsString(exec, result);
}

bool WebFrame::stringByEvaluatingJavaScriptInScriptWorld(WebScriptWorld* world, void* jsGlobalObject, const char* script, const char** evaluationResult)
{
    if (!world || !jsGlobalObject || !evaluationResult)
        return false;
    *evaluationResult = 0;

    Frame* coreFrame = core(this);
    JSObjectRef globalObjectRef = reinterpret_cast<JSObjectRef>(jsGlobalObject);
    String string = String(script);

    // Start off with some guess at a frame and a global object, we'll try to do better...!
    JSDOMWindow* anyWorldGlobalObject = coreFrame->script()->globalObject(mainThreadNormalWorld());

    // The global object is probably a shell object? - if so, we know how to use this!
    JSC::JSObject* globalObjectObj = toJS(globalObjectRef);
    if (!strcmp(globalObjectObj->classInfo()->className, "JSDOMWindowShell"))
        anyWorldGlobalObject = static_cast<JSDOMWindowShell*>(globalObjectObj)->window();

    // Get the frame from the global object we've settled on.
    Frame* frame = anyWorldGlobalObject->impl()->frame();
    ASSERT(frame->document());
    JSC::JSValue result = frame->script()->executeScriptInWorld(world->world(), string, true).jsValue();

    if (!frame) // In case the script removed our frame from the page.
        return true;

    // This bizarre set of rules matches behavior from WebKit for Safari 2.0.
    // If you don't like it, use -[WebScriptObject evaluateWebScript:] or 
    // JSEvaluateScript instead, since they have less surprising semantics.
    if (!result || !result.isBoolean() && !result.isString() && !result.isNumber())
        return true;

    JSC::JSLock lock(JSC::SilenceAssertionsOnly);
    String resultString = ustringToString(result.toString(anyWorldGlobalObject->globalExec()));
    *evaluationResult = strdup(resultString.utf8().data());

    return true;
}