public ReadResults Parse(IStringReader reader, DispatcherResources resources, out HashSet <char> result)
{
result = new HashSet <char>();
int start = reader.GetCursor();
while (!reader.AtEndOfArgument())
{
char c = reader.Read();
if (!Characters.Contains(c) || result.Contains(c))
{
reader.SetCursor(start);
return(ReadResults.Failure(CommandError.InvalidSwizzle(Characters).WithContext(reader)));
}
result.Add(c);
}
return(ReadResults.Success());
}