class SimplePoParser::Parser

def message_line
  begin
    if @scanner.getch == '"'
      text = message_text
      unless @scanner.getch == '"'
        err_msg = "The message text '#{text}' must be finished with the double quote character '\"'."
        raise PoSyntaxError, err_msg
      end
      skip_whitespace
      unless end_of_line
        err_msg = "There should be only whitespace until the end of line"
        err_msg += " after the double quote character of a message text."
        raise PoSyntaxError.new(err_msg)
      end
      text
    else
      @scanner.pos = @scanner.pos - 1
      err_msg = "A message text needs to start with the double quote character '\"',"
      err_msg += " but this was found: #{@scanner.peek(10).inspect}"
      raise PoSyntaxError, err_msg
    end
  rescue PoSyntaxError => pe
    raise PoSyntaxError, "Syntax error in message_line\n" + pe.message, pe.backtrace
  end
end