循环处理所有的行
        :param lines:
        :type lines:
        :return:
        :rtype:

def _process_lines(self, lines):
        """
        循环处理所有的行
        :param lines:
        :type lines:
        :return:
        :rtype:
        """
        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)