code: private final void nextToken()
    {
  
      if (m_queueMark < m_ops.getTokenQueueSize())
      {
        m_token = (String) m_ops.m_tokenQueue.elementAt(m_queueMark++);
        m_tokenChar = m_token.charAt(0);
      }
      else
      {
        m_token = null;
        m_tokenChar = 0;
      }
    }
docs: Retrieve the next token from the command and
  store it in m_token string.