code: def NextToken(self):
      
      self._previous_line = self._line
      self._previous_column = self._column
  
      self._column += len(self.token)
      self._SkipWhitespace()
  
      if not self._more_lines:
        self.token = ''
        return
  
      match = self._TOKEN.match(self._current_line, self._column)
      if not match and not self._skip_comments:
        match = self._COMMENT.match(self._current_line, self._column)
      if match:
        token = match.group(0)
        self.token = token
      else:
        self.token = self._current_line[self._column]
docs: Reads the next meaningful token.