JSValue JSInjectedScriptHost::iteratorEntries(ExecState* exec)
{
if (exec->argumentCount() < 1)
return jsUndefined();
VM& vm = exec->vm();
JSValue iterator;
JSValue value = exec->uncheckedArgument(0);
if (JSMapIterator* mapIterator = jsDynamicCast<JSMapIterator*>(value))
iterator = mapIterator->clone(exec);
else if (JSSetIterator* setIterator = jsDynamicCast<JSSetIterator*>(value))
iterator = setIterator->clone(exec);
else if (JSStringIterator* stringIterator = jsDynamicCast<JSStringIterator*>(value))
iterator = stringIterator->clone(exec);
else if (JSPropertyNameIterator* propertyNameIterator = jsDynamicCast<JSPropertyNameIterator*>(value)) {
iterator = propertyNameIterator->clone(exec);
if (UNLIKELY(vm.exception()))
return JSValue();
} else {
if (JSObject* iteratorObject = jsDynamicCast<JSObject*>(value)) {
// Array Iterators are created in JS for performance reasons. Thus the only way to know we have one is to
// look for a property that is unique to them.
if (JSValue nextIndex = iteratorObject->getDirect(vm, vm.propertyNames->builtinNames().arrayIteratorNextIndexPrivateName()))
iterator = cloneArrayIteratorObject(exec, vm, iteratorObject, nextIndex);
}
}
if (!iterator)
return jsUndefined();
unsigned numberToFetch = 5;
JSValue numberToFetchArg = exec->argument(1);
double fetchDouble = numberToFetchArg.toInteger(exec);
if (fetchDouble >= 0)
numberToFetch = static_cast<unsigned>(fetchDouble);
JSArray* array = constructEmptyArray(exec, nullptr);
if (UNLIKELY(vm.exception()))
return jsUndefined();
for (unsigned i = 0; i < numberToFetch; ++i) {
JSValue next = iteratorStep(exec, iterator);
if (UNLIKELY(vm.exception()))
break;
if (next.isFalse())
break;
JSValue nextValue = iteratorValue(exec, next);
if (UNLIKELY(vm.exception()))
break;
JSObject* entry = constructEmptyObject(exec);
entry->putDirect(exec->vm(), Identifier::fromString(exec, "value"), nextValue);
array->putDirectIndex(exec, i, entry);
}
iteratorClose(exec, iterator);
return array;
}
static EncodedJSValue JSC_HOST_CALL constructWeakSet(ExecState* exec)
{
JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
Structure* weakSetStructure = globalObject->weakSetStructure();
JSWeakSet* weakSet = JSWeakSet::create(exec, weakSetStructure);
JSValue iterable = exec->argument(0);
if (iterable.isUndefinedOrNull())
return JSValue::encode(weakSet);
JSValue adderFunction = weakSet->JSObject::get(exec, exec->propertyNames().add);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData adderFunctionCallData;
CallType adderFunctionCallType = getCallData(adderFunction, adderFunctionCallData);
if (adderFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
JSValue iteratorFunction = iterable.get(exec, exec->propertyNames().iteratorSymbol);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData iteratorFunctionCallData;
CallType iteratorFunctionCallType = getCallData(iteratorFunction, iteratorFunctionCallData);
if (iteratorFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
ArgList iteratorFunctionArguments;
JSValue iterator = call(exec, iteratorFunction, iteratorFunctionCallType, iteratorFunctionCallData, iterable, iteratorFunctionArguments);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (!iterator.isObject())
return JSValue::encode(throwTypeError(exec));
while (true) {
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (next.isFalse())
return JSValue::encode(weakSet);
JSValue nextValue = iteratorValue(exec, next);
if (exec->hadException())
return JSValue::encode(jsUndefined());
MarkedArgumentBuffer arguments;
arguments.append(nextValue);
call(exec, adderFunction, adderFunctionCallType, adderFunctionCallData, weakSet, arguments);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
}
RELEASE_ASSERT_NOT_REACHED();
return JSValue::encode(weakSet);
}
EncodedJSValue JSC_HOST_CALL JSPromiseConstructorFuncAll(ExecState* exec)
{
// -- Promise.all(iterable) --
JSValue iterable = exec->argument(0);
VM& vm = exec->vm();
// 1. Let 'C' be the this value.
JSValue C = exec->thisValue();
// 2. Let 'deferred' be the result of calling GetDeferred(C).
JSValue deferredValue = createJSPromiseDeferredFromConstructor(exec, C);
// 3. ReturnIfAbrupt(deferred).
if (exec->hadException())
return JSValue::encode(jsUndefined());
// NOTE: A non-abrupt completion of createJSPromiseDeferredFromConstructor implies that
// C and deferredValue are objects.
JSPromiseDeferred* deferred = jsCast<JSPromiseDeferred*>(deferredValue);
// 4. Let 'iterator' be the result of calling GetIterator(iterable).
JSValue iteratorFunction = iterable.get(exec, vm.propertyNames->iteratorSymbol);
if (exec->hadException())
return JSValue::encode(abruptRejection(exec, deferred));
CallData iteratorFunctionCallData;
CallType iteratorFunctionCallType = getCallData(iteratorFunction, iteratorFunctionCallData);
if (iteratorFunctionCallType == CallTypeNone) {
throwTypeError(exec);
return JSValue::encode(abruptRejection(exec, deferred));
}
ArgList iteratorFunctionArguments;
JSValue iterator = call(exec, iteratorFunction, iteratorFunctionCallType, iteratorFunctionCallData, iterable, iteratorFunctionArguments);
// 5. RejectIfAbrupt(iterator, deferred).
if (exec->hadException())
return JSValue::encode(abruptRejection(exec, deferred));
JSValue result = performPromiseAll(exec, iterator, C, deferred);
if (exec->hadException()) {
iteratorClose(exec, iterator);
if (exec->hadException())
return JSValue::encode(abruptRejection(exec, deferred));
}
return JSValue::encode(result);
}
JSValue JSInjectedScriptHost::iteratorEntries(ExecState* exec)
{
if (exec->argumentCount() < 1)
return jsUndefined();
JSValue iterator;
JSValue value = exec->uncheckedArgument(0);
if (JSArrayIterator* arrayIterator = jsDynamicCast<JSArrayIterator*>(value))
iterator = arrayIterator->clone(exec);
else if (JSMapIterator* mapIterator = jsDynamicCast<JSMapIterator*>(value))
iterator = mapIterator->clone(exec);
else if (JSSetIterator* setIterator = jsDynamicCast<JSSetIterator*>(value))
iterator = setIterator->clone(exec);
else if (JSStringIterator* stringIterator = jsDynamicCast<JSStringIterator*>(value))
iterator = stringIterator->clone(exec);
else if (JSPropertyNameIterator* propertyNameIterator = jsDynamicCast<JSPropertyNameIterator*>(value))
iterator = propertyNameIterator->clone(exec);
else
return jsUndefined();
unsigned numberToFetch = 5;
JSValue numberToFetchArg = exec->argument(1);
double fetchDouble = numberToFetchArg.toInteger(exec);
if (fetchDouble >= 0)
numberToFetch = static_cast<unsigned>(fetchDouble);
JSArray* array = constructEmptyArray(exec, nullptr);
for (unsigned i = 0; i < numberToFetch; ++i) {
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
break;
if (next.isFalse())
break;
JSValue nextValue = iteratorValue(exec, next);
if (exec->hadException())
break;
JSObject* entry = constructEmptyObject(exec);
entry->putDirect(exec->vm(), Identifier::fromString(exec, "value"), nextValue);
array->putDirectIndex(exec, i, entry);
}
iteratorClose(exec, iterator);
return array;
}
static EncodedJSValue JSC_HOST_CALL constructMap(ExecState* exec)
{
JSValue prototype = JSValue();
JSValue newTarget = exec->newTarget();
if (newTarget != exec->callee())
prototype = newTarget.get(exec, exec->propertyNames().prototype);
JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
Structure* mapStructure = Structure::createSubclassStructure(exec->vm(), globalObject->mapStructure(), prototype);
JSMap* map = JSMap::create(exec, mapStructure);
JSValue iterable = exec->argument(0);
if (iterable.isUndefinedOrNull())
return JSValue::encode(map);
JSValue adderFunction = map->JSObject::get(exec, exec->propertyNames().set);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData adderFunctionCallData;
CallType adderFunctionCallType = getCallData(adderFunction, adderFunctionCallData);
if (adderFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
JSValue iteratorFunction = iterable.get(exec, exec->propertyNames().iteratorSymbol);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData iteratorFunctionCallData;
CallType iteratorFunctionCallType = getCallData(iteratorFunction, iteratorFunctionCallData);
if (iteratorFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
ArgList iteratorFunctionArguments;
JSValue iterator = call(exec, iteratorFunction, iteratorFunctionCallType, iteratorFunctionCallData, iterable, iteratorFunctionArguments);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (!iterator.isObject())
return JSValue::encode(throwTypeError(exec));
while (true) {
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (next.isFalse())
return JSValue::encode(map);
JSValue nextItem = iteratorValue(exec, next);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (!nextItem.isObject()) {
throwTypeError(exec);
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
JSValue key = nextItem.get(exec, 0);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
JSValue value = nextItem.get(exec, 1);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
MarkedArgumentBuffer arguments;
arguments.append(key);
arguments.append(value);
call(exec, adderFunction, adderFunctionCallType, adderFunctionCallData, map, arguments);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
}
RELEASE_ASSERT_NOT_REACHED();
return JSValue::encode(map);
}
