public override ICollection <IParseTree> Evaluate(IParseTree t)
{
if (invert)
{
return(new List <IParseTree>());
}
// !* is weird but valid (empty)
return(Trees.GetDescendants(t));
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var context = value as IParseTree;
var children = new List <IParseTree>();
foreach (var child in Trees.GetDescendants(context))
{
if (child.Parent == context)
{
children.Add(child);
}
}
return(children);
}