code: def _escape_parameters(self, char):
          
  
          if char == ";":
              self.params.append(int(self.current_param))
              self.current_param = ""
          elif char == "?":
              self.state = "mode"
          elif not char.isdigit():
              if len(self.current_param) > 0:
                  self.params.append(int(self.current_param))
  
              # If we're in parameter parsing mode, but we see a non-numeric 
              # value, it must be the end of the control sequence.
              self._end_escape_sequence(char)
          else:
              self.current_param += char
docs: Parse parameters in an escape sequence. Parameters are a list of
          numbers in ascii (e.g. '12', '4', '42', etc) separated by a semicolon
          (e.g. "12;4;42").
          
          See the [vt102 user guide](http://vt100.net/docs/vt102-ug/) for more
          details on the formatting of escape parameters.