code: def _process_lines(self, lines):
          
          if self._chapterization:
              idx = 1
              chapter = Chapter('前言', 0)
              for line in lines:
                  if self._is_chapter_title(line):
                      chapter = Chapter(line.strip(), idx)
                      self._chapters.append(chapter)
                      idx += 1
                  else:
                      if len(line.strip()):
                          chapter.append_line(line)
          else:
              chapter = Chapter('', 0)
              for line in lines:
                  if len(line.strip()):
                      chapter.append_line(line)
              self._chapters.append(chapter)
docs: 循环处理所有的行
          :param lines:
          :type lines:
          :return:
          :rtype: