/// <summary>
/// https://tc39.es/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-delete-p
/// </summary>
public override bool Delete(JsValue property)
{
if (!TryCallHandler(TrapDeleteProperty, new[] { _target, TypeConverter.ToPropertyKey(property) }, out var result))
{
return(_target.Delete(property));
}
var booleanTrapResult = TypeConverter.ToBoolean(result);
if (!booleanTrapResult)
{
return(false);
}
var targetDesc = _target.GetOwnProperty(property);
if (targetDesc == PropertyDescriptor.Undefined)
{
return(true);
}
if (!targetDesc.Configurable)
{
ExceptionHelper.ThrowTypeError(_engine.Realm, $"'deleteProperty' on proxy: trap returned truish for property '{property}' which is non-configurable in the proxy target");
}
if (!_target.Extensible)
{
ExceptionHelper.ThrowTypeError(_engine.Realm);
}
return(true);
}
public override bool Delete(JsValue property)
{
if (!TryCallHandler(TrapDeleteProperty, new JsValue[] { _target, property }, out var result))
{
return(_target.Delete(property));
}
var success = TypeConverter.ToBoolean(result);
if (success)
{
var targetDesc = _target.GetOwnProperty(property);
if (targetDesc != PropertyDescriptor.Undefined && !targetDesc.Configurable)
{
ExceptionHelper.ThrowTypeError(_engine, $"'deleteProperty' on proxy: trap returned truish for property '{property}' which is non-configurable in the proxy target");
}
}
return(success);
}
public JsValue Pop(JsValue thisObject, JsValue[] arguments)
{
ObjectInstance o = TypeConverter.ToObject(Engine, thisObject);
var lenVal = TypeConverter.ToNumber(o.Get("length"));
uint len = TypeConverter.ToUint32(lenVal);
if (len == 0)
{
o.Put("length", 0, true);
return Undefined.Instance;
}
else
{
len = len - 1;
string indx = TypeConverter.ToString(len);
JsValue element = o.Get(indx);
o.Delete(indx, true);
o.Put("length", len, true);
return element;
}
}
public override bool DeleteBinding(string name)
{
return(_bindingObject.Delete(name, false));
}
public override void DeleteAt(uint index) => _instance.Delete(TypeConverter.ToString(index), true);