C++ JSValue::inherits方法代码示例

JSValue JSInjectedScriptHost::type(ExecState* exec)
{
    if (exec->argumentCount() < 1)
        return jsUndefined();

    JSValue value = exec->argument(0);
    if (value.isString())
        return jsString(exec, String("string"));
    if (value.inherits(&JSArray::s_info))
        return jsString(exec, String("array"));
    if (value.isBoolean())
        return jsString(exec, String("boolean"));
    if (value.isNumber())
        return jsString(exec, String("number"));
    if (value.inherits(&DateInstance::s_info))
        return jsString(exec, String("date"));
    if (value.inherits(&RegExpObject::s_info))
        return jsString(exec, String("regexp"));
    if (value.inherits(&JSNode::s_info))
        return jsString(exec, String("node"));
    if (value.inherits(&JSNodeList::s_info))
        return jsString(exec, String("array"));
    if (value.inherits(&JSHTMLCollection::s_info))
        return jsString(exec, String("array"));
    if (value.inherits(&JSInt8Array::s_info) || value.inherits(&JSInt16Array::s_info) || value.inherits(&JSInt32Array::s_info))
        return jsString(exec, String("array"));
    if (value.inherits(&JSUint8Array::s_info) || value.inherits(&JSUint16Array::s_info) || value.inherits(&JSUint32Array::s_info))
        return jsString(exec, String("array"));
    if (value.inherits(&JSFloat32Array::s_info) || value.inherits(&JSFloat64Array::s_info))
        return jsString(exec, String("array"));
    return jsUndefined();
}

bool isInterruptedExecutionException(JSValue value)
{
    return value.inherits(&InterruptedExecutionError::s_info);
}

bool isTerminatedExecutionException(JSValue value)
{
    return value.inherits(TerminatedExecutionError::info());
}

JSValue JSInjectedScriptHost::subtype(ExecState* exec)
{
    if (exec->argumentCount() < 1)
        return jsUndefined();

    JSValue value = exec->uncheckedArgument(0);
    if (value.isString())
        return exec->vm().smallStrings.stringString();
    if (value.isBoolean())
        return exec->vm().smallStrings.booleanString();
    if (value.isNumber())
        return exec->vm().smallStrings.numberString();
    if (value.isSymbol())
        return exec->vm().smallStrings.symbolString();

    JSObject* object = asObject(value);
    if (object) {
        if (object->isErrorInstance())
            return jsNontrivialString(exec, ASCIILiteral("error"));

        // Consider class constructor functions class objects.
        JSFunction* function = jsDynamicCast<JSFunction*>(value);
        if (function && function->isClassConstructorFunction())
            return jsNontrivialString(exec, ASCIILiteral("class"));
    }

    if (value.inherits(JSArray::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));
    if (value.inherits(DirectArguments::info()) || value.inherits(ScopedArguments::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));

    if (value.inherits(DateInstance::info()))
        return jsNontrivialString(exec, ASCIILiteral("date"));
    if (value.inherits(RegExpObject::info()))
        return jsNontrivialString(exec, ASCIILiteral("regexp"));

    if (value.inherits(JSMap::info()))
        return jsNontrivialString(exec, ASCIILiteral("map"));
    if (value.inherits(JSSet::info()))
        return jsNontrivialString(exec, ASCIILiteral("set"));
    if (value.inherits(JSWeakMap::info()))
        return jsNontrivialString(exec, ASCIILiteral("weakmap"));
    if (value.inherits(JSWeakSet::info()))
        return jsNontrivialString(exec, ASCIILiteral("weakset"));

    if (value.inherits(JSArrayIterator::info())
        || value.inherits(JSMapIterator::info())
        || value.inherits(JSSetIterator::info())
        || value.inherits(JSStringIterator::info())
        || value.inherits(JSPropertyNameIterator::info()))
        return jsNontrivialString(exec, ASCIILiteral("iterator"));

    if (object && object->getDirect(exec->vm(), exec->vm().propertyNames->builtinNames().arrayIteratorNextIndexPrivateName()))
        return jsNontrivialString(exec, ASCIILiteral("iterator"));

    if (value.inherits(JSInt8Array::info()) || value.inherits(JSInt16Array::info()) || value.inherits(JSInt32Array::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));
    if (value.inherits(JSUint8Array::info()) || value.inherits(JSUint16Array::info()) || value.inherits(JSUint32Array::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));
    if (value.inherits(JSFloat32Array::info()) || value.inherits(JSFloat64Array::info()))
        return jsNontrivialString(exec, ASCIILiteral("array"));

    return impl().subtype(exec, value);
}

EncodedJSValue JSC_HOST_CALL JSBlobConstructor::constructJSBlob(ExecState* exec)
{
    JSBlobConstructor* jsConstructor = jsCast<JSBlobConstructor*>(exec->callee());
    ScriptExecutionContext* context = jsConstructor->scriptExecutionContext();
    if (!context)
        return throwVMError(exec, createReferenceError(exec, "Blob constructor associated document is unavailable"));

    if (!exec->argumentCount()) {
        RefPtr<Blob> blob = Blob::create();
        return JSValue::encode(CREATE_DOM_WRAPPER(exec, jsConstructor->globalObject(), Blob, blob.get()));
    }

    JSValue firstArg = exec->argument(0);
    if (!isJSArray(firstArg))
        return throwVMError(exec, createTypeError(exec, "First argument of the constructor is not of type Array"));

    String type;
    String endings = "transparent";

    if (exec->argumentCount() > 1) {
        JSValue blobPropertyBagValue = exec->argument(1);

        if (!blobPropertyBagValue.isObject())
            return throwVMError(exec, createTypeError(exec, "Second argument of the constructor is not of type Object"));

        // Given the above test, this will always yield an object.
        JSObject* blobPropertyBagObject = blobPropertyBagValue.toObject(exec);

        // Create the dictionary wrapper from the initializer object.
        JSDictionary dictionary(exec, blobPropertyBagObject);

        // Attempt to get the endings property and validate it.
        bool containsEndings = dictionary.get("endings", endings);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());

        if (containsEndings) {
            if (endings != "transparent" && endings != "native")
                return throwVMError(exec, createTypeError(exec, "The endings property must be either \"transparent\" or \"native\""));
        }

        // Attempt to get the type property.
        dictionary.get("type", type);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());
        if (!type.containsOnlyASCII())
            return throwVMError(exec, createSyntaxError(exec, "type must consist of ASCII characters"));
    }

    ASSERT(endings == "transparent" || endings == "native");

    // FIXME: this would be better if the WebKitBlobBuilder were a stack object to avoid the allocation.
    RefPtr<WebKitBlobBuilder> blobBuilder = WebKitBlobBuilder::create();

    JSArray* array = asArray(firstArg);
    unsigned length = array->length();

    for (unsigned i = 0; i < length; ++i) {
        JSValue item = array->getIndex(i);
#if ENABLE(BLOB)
        if (item.inherits(&JSArrayBuffer::s_info))
            blobBuilder->append(context, toArrayBuffer(item));
        else if (item.inherits(&JSArrayBufferView::s_info))
            blobBuilder->append(toArrayBufferView(item));
        else
#endif
        if (item.inherits(&JSBlob::s_info))
            blobBuilder->append(toBlob(item));
        else {
            String string = ustringToString(item.toString(exec)->value(exec));
            if (exec->hadException())
                return JSValue::encode(jsUndefined());
            blobBuilder->append(string, endings, ASSERT_NO_EXCEPTION);
        }
    }

    RefPtr<Blob> blob = blobBuilder->getBlob(type);
    return JSValue::encode(CREATE_DOM_WRAPPER(exec, jsConstructor->globalObject(), Blob, blob.get()));
}

//--------------------------------------------------------------------------
// KJSValueToCFTypeInternal
//--------------------------------------------------------------------------
// Caller is responsible for releasing the returned CFTypeRef
CFTypeRef KJSValueToCFTypeInternal(JSValue inValue, ExecState *exec, ObjectImpList* inImps)
{
    if (!inValue)
        return 0;

    CFTypeRef result = 0;

    JSGlueAPIEntry entry;

        if (inValue.isBoolean())
            {
                result = inValue.toBoolean(exec) ? kCFBooleanTrue : kCFBooleanFalse;
                RetainCFType(result);
                return result;
            }

        if (inValue.isString())
            {
                UString uString = inValue.toString(exec);
                result = UStringToCFString(uString);
                return result;
            }

        if (inValue.isNumber())
            {
                double number1 = inValue.toNumber(exec);
                double number2 = (double)inValue.toInteger(exec);
                if (number1 ==  number2)
                {
                    int intValue = (int)number2;
                    result = CFNumberCreate(0, kCFNumberIntType, &intValue);
                }
                else
                {
                    result = CFNumberCreate(0, kCFNumberDoubleType, &number1);
                }
                return result;
            }

        if (inValue.isObject())
            {
                if (inValue.inherits(&UserObjectImp::s_info)) {
                    UserObjectImp* userObjectImp = static_cast<UserObjectImp *>(asObject(inValue));
                    JSUserObject* ptr = userObjectImp->GetJSUserObject();
                    if (ptr)
                    {
                        result = ptr->CopyCFValue();
                    }
                }
                else
                {
                    JSObject *object = inValue.toObject(exec);
                    UInt8 isArray = false;

                    // if two objects reference each
                    JSObject* imp = object;
                    ObjectImpList* temp = inImps;
                    while (temp) {
                        if (imp == temp->imp) {
                            return CFRetain(GetCFNull());
                        }
                        temp = temp->next;
                    }

                    ObjectImpList imps;
                    imps.next = inImps;
                    imps.imp = imp;


//[...] HACK since we do not have access to the class info we use class name instead
#if 0
                    if (object->inherits(&ArrayInstanceImp::s_info))
#else
                    if (object->className() == "Array")
#endif
                    {
                        isArray = true;
                        JSGlueGlobalObject* globalObject = static_cast<JSGlueGlobalObject*>(exec->dynamicGlobalObject());
                        if (globalObject && (globalObject->Flags() & kJSFlagConvertAssociativeArray)) {
                            PropertyNameArray propNames(exec);
                            object->getPropertyNames(exec, propNames);
                            PropertyNameArray::const_iterator iter = propNames.begin();
                            PropertyNameArray::const_iterator end = propNames.end();
                            while(iter != end && isArray)
                            {
                                Identifier propName = *iter;
                                UString ustr = propName.ustring();
                                const UniChar* uniChars = (const UniChar*)ustr.characters();
                                int size = ustr.length();
                                while (size--) {
                                    if (uniChars[size] < '0' || uniChars[size] > '9') {
                                        isArray = false;
                                        break;
                                    }
                                }
                                iter++;
//.........这里部分代码省略.........

JSValue JSC_HOST_CALL regExpProtoFuncExec(ExecState* exec, JSObject*, JSValue thisValue, const ArgList& args)
{
    if (!thisValue.inherits(&RegExpObject::info))
        return throwError(exec, TypeError);
    return asRegExpObject(thisValue)->exec(exec, args);
}

EncodedJSValue JSC_HOST_CALL arrayProtoFuncToString(ExecState* exec)
{
    JSValue thisValue = exec->hostThisValue();
    bool isRealArray = isJSArray(&exec->globalData(), thisValue);
    if (!isRealArray && !thisValue.inherits(&JSArray::info))
        return throwVMTypeError(exec);
    JSArray* thisObj = asArray(thisValue);
    
    HashSet<JSObject*>& arrayVisitedElements = exec->globalData().arrayVisitedElements;
    if (arrayVisitedElements.size() >= MaxSmallThreadReentryDepth) {
        if (arrayVisitedElements.size() >= exec->globalData().maxReentryDepth)
            return throwVMError(exec, createStackOverflowError(exec));
    }

    bool alreadyVisited = !arrayVisitedElements.add(thisObj).second;
    if (alreadyVisited)
        return JSValue::encode(jsEmptyString(exec)); // return an empty string, avoiding infinite recursion.

//FYWEBKITMOD begin: setting up StringJoiner (while integrating r148721 due to fix of bug 114779). But not using 'ConstructFromLiteral' optimization which we dont have in our webkit.
    unsigned length = thisObj->get(exec, exec->propertyNames().length).toUInt32(exec);
    if (exec->hadException())
        return JSValue::encode(jsUndefined());

	//WebCore::String separator(",", WebCore::String::ConstructFromLiteral);
	//JSStringJoiner stringJoiner(separator, length);
	JSStringJoiner stringJoiner(",", length);
//FYWEBKITMOD end
    unsigned totalSize = length ? length - 1 : 0;
    Vector<RefPtr<UString::Rep>, 256> strBuffer(length);
    for (unsigned k = 0; k < length; k++) {
        JSValue element;
        if (isRealArray && thisObj->canGetIndex(k))
            element = thisObj->getIndex(k);
        else {
            element = thisObj->get(exec, k);
//FYWEBKITMOD begin: added while integrating r148721 due to fix of bug 114779
			if (exec->hadException()) 
				return JSValue::encode(jsUndefined());
//FYWEBKITMOD end
			}
        
//FYWEBKITMOD begin: removed (USE_FIX 1) old implementation which joined the strings manually and added usage of JSStringJoiner (while integrating r148721 due to fix of bug 114779)
#define USE_FIX 1 //keep this defined!!!
#ifdef USE_FIX
		if (element.isUndefinedOrNull()) 
			stringJoiner.append(WebCore::String()); //FYWEBKITMOD: 
		else
			stringJoiner.append(element.toString(exec).rep()); //FYWEBKITMOD: using toString() instead of new toWTFString(). Only difference is an optimization used in the toWTFString() case.

		if (exec->hadException())
			return JSValue::encode(jsUndefined());
		}

	arrayVisitedElements.remove(thisObj);

	return JSValue::encode(stringJoiner.build(exec));

#else
        if (element.isUndefinedOrNull())
            continue;
        
        UString str = element.toString(exec);
        strBuffer[k] = str.rep();
        totalSize += str.size();
        
        if (!strBuffer.data()) {
            throwOutOfMemoryError(exec);
        }
        
        if (exec->hadException())
            break;
    }