/// <summary>
/// Overriden. Returns a property descriptor.
/// </summary>
/// <remarks>
/// Tries to resolve proeprty in the following order:
///
/// 1. OwnProperty for the current scope
/// 2. Any property from the bag (if specified).
/// 3. A property from scopes hierarchy.
/// </remarks>
/// <param name="index">Property name.</param>
/// <returns>Descriptor</returns>
public override Descriptor GetDescriptor(string index)
{
Descriptor own, d;
if ((own = base.GetDescriptor(index)) != null && own.Owner == this)
{
return(own);
}
if (bag != null && (d = bag.GetDescriptor(index)) != null)
{
return(d);
}
return(own);
}
public virtual Descriptor GetDescriptor(string index)
{
Descriptor result;
if (properties.TryGet(index, out result))
{
return(result);
}
// Prototype always a JsObject, (JsNull.Instance is also an object and next call will return null in case of null)
if ((result = Prototype.GetDescriptor(index)) != null)
{
properties.Put(index, result); // cache descriptior
}
return(result);
}
/// <summary>
/// Overriden. Returns a property descriptor.
/// </summary>
/// <remarks>
/// Tries to resolve proeprty in the following order:
///
/// 1. OwnProperty for the current scope
/// 2. Any property from the bag (if specified).
/// 3. A property from scopes hierarchy.
///
/// A proeprty from the bag will be added as a link to the current scope.
/// </remarks>
/// <param name="index">Property name.</param>
/// <returns>Descriptor</returns>
public override Descriptor GetDescriptor(string index)
{
Descriptor own, d;
if ((own = base.GetDescriptor(index)) != null && own.Owner == this)
{
return(own);
}
if (bag != null && (d = bag.GetDescriptor(index)) != null)
{
Descriptor link = new LinkedDescriptor(this, d.Name, d, bag);
DefineOwnProperty(link);
return(link);
}
return(own);
}