/// <summary>
/// https://tc39.es/ecma262/#sec-setintegritylevel
/// </summary>
private static bool SetIntegrityLevel(ObjectInstance o, IntegrityLevel level)
{
var status = o.PreventExtensions();
if (!status)
{
return(false);
}
var keys = o.GetOwnPropertyKeys();
if (level == IntegrityLevel.Sealed)
{
for (var i = 0; i < keys.Count; i++)
{
var k = keys[i];
o.DefinePropertyOrThrow(k, new PropertyDescriptor {
Configurable = false
});
}
}
else
{
for (var i = 0; i < keys.Count; i++)
{
var k = keys[i];
var currentDesc = o.GetOwnProperty(k);
if (currentDesc != PropertyDescriptor.Undefined)
{
PropertyDescriptor desc;
if (currentDesc.IsAccessorDescriptor())
{
desc = new PropertyDescriptor {
Configurable = false
};
}
else
{
desc = new PropertyDescriptor {
Configurable = false, Writable = false
};
}
o.DefinePropertyOrThrow(k, desc);
}
}
}
return(true);
}
/// <summary>
/// https://tc39.es/ecma262/#sec-objectdefineproperties
/// </summary>
private JsValue ObjectDefineProperties(ObjectInstance o, JsValue properties)
{
var props = TypeConverter.ToObject(_realm, properties);
var keys = props.GetOwnPropertyKeys();
var descriptors = new List <KeyValuePair <JsValue, PropertyDescriptor> >();
for (var i = 0; i < keys.Count; i++)
{
var nextKey = keys[i];
var propDesc = props.GetOwnProperty(nextKey);
if (propDesc == PropertyDescriptor.Undefined || !propDesc.Enumerable)
{
continue;
}
var descObj = props.UnwrapJsValue(propDesc);
var desc = PropertyDescriptor.ToPropertyDescriptor(_realm, descObj);
descriptors.Add(new KeyValuePair <JsValue, PropertyDescriptor>(nextKey, desc));
}
foreach (var pair in descriptors)
{
o.DefinePropertyOrThrow(pair.Key, pair.Value);
}
return(o);
}