private static bool MoveNextSafe(EcmaIteratorEnumerator iterator)
{
try {
return(iterator.MoveNext());
} catch {
// do not explicitly close iterator when abrupt completion from getting next value
// mark iterator done when exception throw from iterator.MoveNext()
iterator.Done();
throw;
}
}
public static StatefulIterator GetAsyncIterator(this RuntimeObject obj)
{
Guard.ArgumentNotNull(obj, "obj");
RuntimeObject method = obj.GetMethod(Symbol.AsyncIterator);
if (method == null)
{
EcmaIteratorEnumerator syncIterator = GetIterator(obj);
return(new AsyncFromSyncIterator(syncIterator));
}
EcmaValue iterator = method.Call(obj);
Guard.ArgumentIsObject(iterator);
return(iterator.GetUnderlyingObject <AsyncGenerator>());
}
public static EcmaValue Race([This] EcmaValue thisValue, EcmaValue iterable)
{
Guard.ArgumentIsObject(thisValue);
PromiseCapability capability = PromiseCapability.CreateFromConstructor(thisValue.ToObject());
try {
using (EcmaIteratorEnumerator iterator = iterable.ForOf()) {
EcmaValue resolve = thisValue[WellKnownProperty.Resolve];
while (MoveNextSafe(iterator))
{
EcmaValue thenable = resolve.Call(thisValue, iterator.Current);
thenable.Invoke(WellKnownProperty.Then, capability.ResolveCallback, capability.RejectCallback);
}
}
} catch (Exception ex) {
capability.Reject(EcmaValueUtility.GetValueFromException(ex));
}
return(capability.Promise);
}
public static EcmaValue All([This] EcmaValue thisValue, EcmaValue iterable)
{
Guard.ArgumentIsObject(thisValue);
PromiseCapability capability = PromiseCapability.CreateFromConstructor(thisValue.ToObject());
PromiseAggregator aggregator = new AllFulfilledAggregator(capability);
try {
using (EcmaIteratorEnumerator iterator = iterable.ForOf()) {
EcmaValue resolve = thisValue[WellKnownProperty.Resolve];
while (MoveNextSafe(iterator))
{
EcmaValue thenable = resolve.Call(thisValue, iterator.Current);
thenable.Invoke(WellKnownProperty.Then, (PromiseResolver)aggregator.CreateHandler().ResolveHandler, capability.RejectCallback);
}
}
aggregator.ResolveIfConditionMet();
} catch (Exception ex) {
capability.Reject(EcmaValueUtility.GetValueFromException(ex));
}
return(capability.Promise);
}
