public CommandParser()
{
CommandTextTokenizer = new StringTokenizer();
OperatorDefinitions = new OperatorDefinitions();
}
public CommandParser(OperatorDefinitions operatorDefinitions, StringTokenizer commandTokenizer)
{
OperatorDefinitions = operatorDefinitions ?? throw new ArgumentNullException(nameof(operatorDefinitions));
CommandTextTokenizer = commandTokenizer ?? throw new ArgumentNullException(nameof(commandTokenizer));
}