C++ JSValue::toWTFString方法代码示例

static void populateContextMenuItems(ExecState* exec, JSArray* array, ContextMenu& menu)
{
    for (size_t i = 0; i < array->length(); ++i) {
        JSObject* item = asObject(array->getIndex(exec, i));
        JSValue label = item->get(exec, Identifier::fromString(exec, "label"));
        JSValue type = item->get(exec, Identifier::fromString(exec, "type"));
        JSValue id = item->get(exec, Identifier::fromString(exec, "id"));
        JSValue enabled = item->get(exec, Identifier::fromString(exec, "enabled"));
        JSValue checked = item->get(exec, Identifier::fromString(exec, "checked"));
        JSValue subItems = item->get(exec, Identifier::fromString(exec, "subItems"));
        if (!type.isString())
            continue;

        String typeString = type.toWTFString(exec);
        if (typeString == "separator") {
            ContextMenuItem item(SeparatorType, ContextMenuItemTagNoAction, String());
            menu.appendItem(item);
        } else if (typeString == "subMenu" && subItems.inherits(JSArray::info())) {
            ContextMenu subMenu;
            JSArray* subItemsArray = asArray(subItems);
            populateContextMenuItems(exec, subItemsArray, subMenu);
            ContextMenuItem item(SubmenuType, ContextMenuItemTagNoAction, label.toWTFString(exec), &subMenu);
            menu.appendItem(item);
        } else {
            ContextMenuAction typedId = static_cast<ContextMenuAction>(ContextMenuItemBaseCustomTag + id.toInt32(exec));
            ContextMenuItem menuItem((typeString == "checkbox" ? CheckableActionType : ActionType), typedId, label.toWTFString(exec));
            if (!enabled.isUndefined())
                menuItem.setEnabled(enabled.toBoolean(exec));
            if (!checked.isUndefined())
                menuItem.setChecked(checked.toBoolean(exec));
            menu.appendItem(menuItem);
        }
    }
}

// Based on ErrorPrototype's errorProtoFuncToString(), but is modified to
// have no observable side effects to the user (i.e. does not call proxies,
// and getters).
String ErrorInstance::sanitizedToString(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSValue nameValue;
    auto namePropertName = vm.propertyNames->name;
    PropertySlot nameSlot(this, PropertySlot::InternalMethodType::VMInquiry);

    JSValue currentObj = this;
    unsigned prototypeDepth = 0;

    // We only check the current object and its prototype (2 levels) because normal
    // Error objects may have a name property, and if not, its prototype should have
    // a name property for the type of error e.g. "SyntaxError".
    while (currentObj.isCell() && prototypeDepth++ < 2) {
        JSObject* obj = jsCast<JSObject*>(currentObj);
        if (JSObject::getOwnPropertySlot(obj, exec, namePropertName, nameSlot) && nameSlot.isValue()) {
            nameValue = nameSlot.getValue(exec, namePropertName);
            break;
        }
        currentObj = obj->getPrototypeDirect();
    }
    ASSERT(!scope.exception());

    String nameString;
    if (!nameValue)
        nameString = ASCIILiteral("Error");
    else {
        nameString = nameValue.toWTFString(exec);
        RETURN_IF_EXCEPTION(scope, String());
    }

    JSValue messageValue;
    auto messagePropertName = vm.propertyNames->message;
    PropertySlot messageSlot(this, PropertySlot::InternalMethodType::VMInquiry);
    if (JSObject::getOwnPropertySlot(this, exec, messagePropertName, messageSlot) && messageSlot.isValue())
        messageValue = messageSlot.getValue(exec, messagePropertName);
    ASSERT(!scope.exception());

    String messageString;
    if (!messageValue)
        messageString = String();
    else {
        messageString = messageValue.toWTFString(exec);
        RETURN_IF_EXCEPTION(scope, String());
    }

    if (!nameString.length())
        return messageString;

    if (!messageString.length())
        return nameString;

    StringBuilder builder;
    builder.append(nameString);
    builder.appendLiteral(": ");
    builder.append(messageString);
    return builder.toString();
}

// ECMA-262 5.1, 15.11.4.4
EncodedJSValue JSC_HOST_CALL errorProtoFuncToString(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    // 1. Let O be the this value.
    JSValue thisValue = exec->thisValue();

    // 2. If Type(O) is not Object, throw a TypeError exception.
    if (!thisValue.isObject())
        return throwVMTypeError(exec, scope);
    JSObject* thisObj = asObject(thisValue);

    // Guard against recursion!
    StringRecursionChecker checker(exec, thisObj);
    ASSERT(!scope.exception() || checker.earlyReturnValue());
    if (JSValue earlyReturnValue = checker.earlyReturnValue())
        return JSValue::encode(earlyReturnValue);

    // 3. Let name be the result of calling the [[Get]] internal method of O with argument "name".
    JSValue name = thisObj->get(exec, exec->propertyNames().name);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    // 4. If name is undefined, then let name be "Error"; else let name be ToString(name).
    String nameString;
    if (name.isUndefined())
        nameString = ASCIILiteral("Error");
    else {
        nameString = name.toWTFString(exec);
        RETURN_IF_EXCEPTION(scope, encodedJSValue());
    }

    // 5. Let msg be the result of calling the [[Get]] internal method of O with argument "message".
    JSValue message = thisObj->get(exec, exec->propertyNames().message);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    // (sic)
    // 6. If msg is undefined, then let msg be the empty String; else let msg be ToString(msg).
    // 7. If msg is undefined, then let msg be the empty String; else let msg be ToString(msg).
    String messageString;
    if (message.isUndefined())
        messageString = String();
    else {
        messageString = message.toWTFString(exec);
        RETURN_IF_EXCEPTION(scope, encodedJSValue());
    }

    // 8. If name is the empty String, return msg.
    if (!nameString.length())
        return JSValue::encode(message.isString() ? message : jsString(exec, messageString));

    // 9. If msg is the empty String, return name.
    if (!messageString.length())
        return JSValue::encode(name.isString() ? name : jsString(exec, nameString));

    // 10. Return the result of concatenating name, ":", a single space character, and msg.
    scope.release();
    return JSValue::encode(jsMakeNontrivialString(exec, nameString, ": ", messageString));
}

void JSLocation::setPort(ExecState* exec, JSValue value)
{
    String port = value.toWTFString(exec);
    if (exec->hadException())
        return;
    impl()->setPort(port, activeDOMWindow(exec), firstDOMWindow(exec));
}

bool JSStorage::putDelegate(ExecState* state, PropertyName propertyName, JSValue value, PutPropertySlot&, bool& putResult)
{
    VM& vm = state->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    // Only perform the custom put if the object doesn't have a native property by this name.
    // Since hasProperty() would end up calling canGetItemsForName() and be fooled, we need to check
    // the native property slots manually.
    PropertySlot slot { this, PropertySlot::InternalMethodType::GetOwnProperty };

    JSValue prototype = this->getPrototypeDirect();
    if (prototype.isObject() && asObject(prototype)->getPropertySlot(state, propertyName, slot))
        return false;

    if (propertyName.isSymbol())
        return false;

    String stringValue = value.toWTFString(state);
    RETURN_IF_EXCEPTION(scope, true);

    auto setItemResult = wrapped().setItem(propertyNameToString(propertyName), stringValue);
    if (setItemResult.hasException()) {
        propagateException(*state, scope, setItemResult.releaseException());
        return true;
    }

    putResult = true;
    return true;
}

static std::error_code getTypeFlags(ExecState& exec, const JSValue& typeValue, ResourceFlags& flags, uint16_t (*stringToType)(const String&))
{
    VM& vm = exec.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (!typeValue.isObject())
        return { };

    const JSObject* object = typeValue.toObject(&exec);
    ASSERT(!scope.exception());
    if (!isJSArray(object))
        return ContentExtensionError::JSONInvalidTriggerFlagsArray;

    const JSArray* array = jsCast<const JSArray*>(object);
    
    unsigned length = array->length();
    for (unsigned i = 0; i < length; ++i) {
        const JSValue value = array->getIndex(&exec, i);
        if (scope.exception() || !value)
            return ContentExtensionError::JSONInvalidObjectInTriggerFlagsArray;
        
        String name = value.toWTFString(&exec);
        uint16_t type = stringToType(name);
        if (!type)
            return ContentExtensionError::JSONInvalidStringInTriggerFlagsArray;

        flags |= type;
    }

    return { };
}

static bool extractSourceInformationFromException(JSC::ExecState* exec, JSObject* exceptionObject, int* lineNumber, int* columnNumber, String* sourceURL)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_CATCH_SCOPE(vm);

    // FIXME: <http://webkit.org/b/115087> Web Inspector: Should not need to evaluate JavaScript handling exceptions
    JSValue lineValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "line"));
    JSValue columnValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "column"));
    JSValue sourceURLValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "sourceURL"));
    
    bool result = false;
    if (lineValue && lineValue.isNumber()
        && sourceURLValue && sourceURLValue.isString()) {
        *lineNumber = int(lineValue.toNumber(exec));
        *columnNumber = columnValue && columnValue.isNumber() ? int(columnValue.toNumber(exec)) : 0;
        *sourceURL = sourceURLValue.toWTFString(exec);
        result = true;
    } else if (ErrorInstance* error = jsDynamicCast<ErrorInstance*>(vm, exceptionObject)) {
        unsigned unsignedLine;
        unsigned unsignedColumn;
        result = getLineColumnAndSource(error->stackTrace(), unsignedLine, unsignedColumn, *sourceURL);
        *lineNumber = static_cast<int>(unsignedLine);
        *columnNumber = static_cast<int>(unsignedColumn);
    }
    
    if (sourceURL->isEmpty())
        *sourceURL = "undefined"_s;
    
    scope.clearException();
    return result;
}

template<> Optional<TestStandaloneDictionary::EnumInStandaloneDictionaryFile> parseEnumeration<TestStandaloneDictionary::EnumInStandaloneDictionaryFile>(ExecState& state, JSValue value)
{
    auto stringValue = value.toWTFString(&state);
    if (stringValue == "enumValue1")
        return TestStandaloneDictionary::EnumInStandaloneDictionaryFile::EnumValue1;
    if (stringValue == "enumValue2")
        return TestStandaloneDictionary::EnumInStandaloneDictionaryFile::EnumValue2;
    return WTF::nullopt;
}

bool setJSTestInterfaceConstructorSupplementalStaticAttr(ExecState* state, EncodedJSValue thisValue, EncodedJSValue encodedValue)
{
    JSValue value = JSValue::decode(encodedValue);
    auto nativeValue = value.toWTFString(state);
    if (UNLIKELY(state->hadException()))
        return false;
    WebCore::TestSupplemental::setSupplementalStaticAttr(WTFMove(nativeValue));
    return true;
}

bool JSDictionary::getWithUndefinedOrNullCheck(const String& propertyName, String& result) const
{
    ASSERT(isValid());
    JSValue value;
    if (tryGetProperty(propertyName.utf8().data(), value) != PropertyFound || value.isUndefinedOrNull())
        return false;

    result = value.toWTFString(m_exec);
    return true;
}

static std::error_code loadAction(ExecState& exec, const JSObject& ruleObject, Action& action, bool& validSelector)
{
    VM& vm = exec.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    validSelector = true;
    const JSValue actionObject = ruleObject.get(&exec, Identifier::fromString(&exec, "action"));
    if (!actionObject || scope.exception() || !actionObject.isObject())
        return ContentExtensionError::JSONInvalidAction;

    const JSValue typeObject = actionObject.get(&exec, Identifier::fromString(&exec, "type"));
    if (!typeObject || scope.exception() || !typeObject.isString())
        return ContentExtensionError::JSONInvalidActionType;

    String actionType = typeObject.toWTFString(&exec);

    if (actionType == "block")
        action = ActionType::BlockLoad;
    else if (actionType == "ignore-previous-rules")
        action = ActionType::IgnorePreviousRules;
    else if (actionType == "block-cookies")
        action = ActionType::BlockCookies;
    else if (actionType == "css-display-none") {
        JSValue selector = actionObject.get(&exec, Identifier::fromString(&exec, "selector"));
        if (!selector || scope.exception() || !selector.isString())
            return ContentExtensionError::JSONInvalidCSSDisplayNoneActionType;

        String s = selector.toWTFString(&exec);
        if (!isValidSelector(s)) {
            // Skip rules with invalid selectors to be backwards-compatible.
            validSelector = false;
            return { };
        }
        action = Action(ActionType::CSSDisplayNoneSelector, s);
    } else if (actionType == "make-https") {
        action = ActionType::MakeHTTPS;
    } else
        return ContentExtensionError::JSONInvalidActionType;

    return { };
}

bool setJSTestInterfaceSupplementalStr2(ExecState* state, EncodedJSValue thisValue, EncodedJSValue encodedValue)
{
    JSValue value = JSValue::decode(encodedValue);
    UNUSED_PARAM(thisValue);
    JSTestInterface* castedThis = jsDynamicCast<JSTestInterface*>(JSValue::decode(thisValue));
    if (UNLIKELY(!castedThis)) {
        return throwSetterTypeError(*state, "TestInterface", "supplementalStr2");
    }
    auto& impl = castedThis->wrapped();
    auto nativeValue = value.toWTFString(state);
    if (UNLIKELY(state->hadException()))
        return false;
    WebCore::TestSupplemental::setSupplementalStr2(impl, WTFMove(nativeValue));
    return true;
}

bool setJSTestNodeName(ExecState* state, EncodedJSValue thisValue, EncodedJSValue encodedValue)
{
    JSValue value = JSValue::decode(encodedValue);
    UNUSED_PARAM(thisValue);
    JSTestNode* castedThis = jsDynamicCast<JSTestNode*>(JSValue::decode(thisValue));
    if (UNLIKELY(!castedThis)) {
        return throwSetterTypeError(*state, "TestNode", "name");
    }
    auto& impl = castedThis->wrapped();
    auto nativeValue = value.toWTFString(state);
    if (UNLIKELY(state->hadException()))
        return false;
    impl.setName(WTFMove(nativeValue));
    return true;
}

bool setJSTestGlobalObjectPublicAndPrivateConditionalAttribute(ExecState* state, EncodedJSValue thisValue, EncodedJSValue encodedValue)
{
    JSValue value = JSValue::decode(encodedValue);
    UNUSED_PARAM(thisValue);
    JSTestGlobalObject* castedThis = jsDynamicCast<JSTestGlobalObject*>(JSValue::decode(thisValue));
    if (UNLIKELY(!castedThis)) {
        return throwSetterTypeError(*state, "TestGlobalObject", "publicAndPrivateConditionalAttribute");
    }
    auto& impl = castedThis->wrapped();
    auto nativeValue = value.toWTFString(state);
    if (UNLIKELY(state->hadException()))
        return false;
    impl.setPublicAndPrivateConditionalAttribute(WTFMove(nativeValue));
    return true;
}

static EncodedJSValue JSC_HOST_CALL constructJSWebAssemblyTable(ExecState* exec)
{
    VM& vm = exec->vm();
    auto throwScope = DECLARE_THROW_SCOPE(vm);

    JSObject* memoryDescriptor;
    {
        JSValue argument = exec->argument(0);
        if (!argument.isObject())
            return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, ASCIILiteral("WebAssembly.Table expects its first argument to be an object"))));
        memoryDescriptor = jsCast<JSObject*>(argument);
    }

    {
        Identifier elementIdent = Identifier::fromString(&vm, "element");
        JSValue elementValue = memoryDescriptor->get(exec, elementIdent);
        RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
        String elementString = elementValue.toWTFString(exec);
        RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
        if (elementString != "anyfunc")
            return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, ASCIILiteral("WebAssembly.Table expects its 'element' field to be the string 'anyfunc'"))));
    }

    Identifier initialIdent = Identifier::fromString(&vm, "initial");
    JSValue initialSizeValue = memoryDescriptor->get(exec, initialIdent);
    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
    uint32_t initial = toNonWrappingUint32(exec, initialSizeValue);
    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());

    std::optional<uint32_t> maximum;
    Identifier maximumIdent = Identifier::fromString(&vm, "maximum");
    bool hasProperty = memoryDescriptor->hasProperty(exec, maximumIdent);
    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
    if (hasProperty) {
        JSValue maxSizeValue = memoryDescriptor->get(exec, maximumIdent);
        RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
        maximum = toNonWrappingUint32(exec, maxSizeValue);
        RETURN_IF_EXCEPTION(throwScope, encodedJSValue());

        if (initial > *maximum) {
            return JSValue::encode(throwException(exec, throwScope,
                createRangeError(exec, ASCIILiteral("'maximum' property must be greater than or equal to the 'initial' property"))));
        }
    }

    throwScope.release();
    return JSValue::encode(JSWebAssemblyTable::create(exec, vm, exec->lexicalGlobalObject()->WebAssemblyTableStructure(), initial, maximum));
}