protected IteratorProtocol(
Engine engine,
IteratorInstance iterator,
int argCount)
{
_engine = engine;
_iterator = iterator;
_argCount = argCount;
}
internal IteratorInstance Construct(IEnumerable <JsValue> enumerable)
{
var instance = new IteratorInstance(Engine, enumerable)
{
_prototype = this
};
return(instance);
}
internal ObjectInstance Construct(IEnumerable <JsValue> enumerable)
{
var instance = new IteratorInstance(Engine, enumerable)
{
_prototype = GenericIteratorPrototypeObject
};
return(instance);
}
internal ObjectInstance Construct(IEnumerable <JsValue> enumerable)
{
var instance = new IteratorInstance(Engine, enumerable)
{
Prototype = PrototypeObject,
Extensible = true
};
return(instance);
}
internal static void AddEntriesFromIterable(ObjectInstance target, IteratorInstance iterable, object adder)
{
var callable = adder as ICallable;
if (callable is null)
{
ExceptionHelper.ThrowTypeError(target.Engine.Realm, "adder must be callable");
}
var args = target.Engine._jsValueArrayPool.RentArray(2);
var skipClose = true;
try
{
do
{
if (!iterable.TryIteratorStep(out var nextItem))
{
return;
}
var temp = nextItem.Get(CommonProperties.Value);
skipClose = false;
var oi = temp as ObjectInstance;
if (oi is null)
{
ExceptionHelper.ThrowTypeError(target.Engine.Realm, "iterator's value must be an object");
}
var k = oi.Get(JsString.NumberZeroString);
var v = oi.Get(JsString.NumberOneString);
args[0] = k;
args[1] = v;
callable.Call(target, args);
} while (true);
}
catch
{
if (!skipClose)
{
iterable.Close(CompletionType.Throw);
}
throw;
}
finally
{
target.Engine._jsValueArrayPool.ReturnArray(args);
}
}