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| from langchain.text_splitter import CharacterTextSplitter | |
| import re | |
| from typing import List | |
| class ChineseTextSplitter(CharacterTextSplitter): | |
| def __init__(self, pdf: bool = False, sentence_size: int = 250, **kwargs): | |
| super().__init__(**kwargs) | |
| self.pdf = pdf | |
| self.sentence_size = sentence_size | |
| def split_text1(self, text: str) -> List[str]: | |
| if self.pdf: | |
| text = re.sub(r"\n{3,}", "\n", text) | |
| text = re.sub('\s', ' ', text) | |
| text = text.replace("\n\n", "") | |
| sent_sep_pattern = re.compile('([﹒﹔﹖﹗．。！？]["’”」』]{0,2}|(?=["‘“「『]{1,2}|$))') # del ：； | |
| sent_list = [] | |
| for ele in sent_sep_pattern.split(text): | |
| if sent_sep_pattern.match(ele) and sent_list: | |
| sent_list[-1] += ele | |
| elif ele: | |
| sent_list.append(ele) | |
| return sent_list | |
| def split_text(self, text: str) -> List[str]: ##此处需要进一步优化逻辑 | |
| if self.pdf: | |
| text = re.sub(r"\n{3,}", r"\n", text) | |
| text = re.sub('\s', " ", text) | |
| text = re.sub("\n\n", "", text) | |
| text = re.sub(r'([;；.!?。！？\?])([^”’])', r"\1\n\2", text) # 单字符断句符 | |
| text = re.sub(r'(\.{6})([^"’”」』])', r"\1\n\2", text) # 英文省略号 | |
| text = re.sub(r'(\…{2})([^"’”」』])', r"\1\n\2", text) # 中文省略号 | |
| text = re.sub(r'([;；!?。！？\?]["’”」』]{0,2})([^;；!?，。！？\?])', r'\1\n\2', text) | |
| # 如果双引号前有终止符，那么双引号才是句子的终点，把分句符\n放到双引号后，注意前面的几句都小心保留了双引号 | |
| text = text.rstrip() # 段尾如果有多余的\n就去掉它 | |
| # 很多规则中会考虑分号;，但是这里我把它忽略不计，破折号、英文双引号等同样忽略，需要的再做些简单调整即可。 | |
| ls = [i for i in text.split("\n") if i] | |
| for ele in ls: | |
| if len(ele) > self.sentence_size: | |
| ele1 = re.sub(r'([,，.]["’”」』]{0,2})([^,，.])', r'\1\n\2', ele) | |
| ele1_ls = ele1.split("\n") | |
| for ele_ele1 in ele1_ls: | |
| if len(ele_ele1) > self.sentence_size: | |
| ele_ele2 = re.sub(r'([\n]{1,}| {2,}["’”」』]{0,2})([^\s])', r'\1\n\2', ele_ele1) | |
| ele2_ls = ele_ele2.split("\n") | |
| for ele_ele2 in ele2_ls: | |
| if len(ele_ele2) > self.sentence_size: | |
| ele_ele3 = re.sub('( ["’”」』]{0,2})([^ ])', r'\1\n\2', ele_ele2) | |
| ele2_id = ele2_ls.index(ele_ele2) | |
| ele2_ls = ele2_ls[:ele2_id] + [i for i in ele_ele3.split("\n") if i] + ele2_ls[ | |
| ele2_id + 1:] | |
| ele_id = ele1_ls.index(ele_ele1) | |
| ele1_ls = ele1_ls[:ele_id] + [i for i in ele2_ls if i] + ele1_ls[ele_id + 1:] | |
| id = ls.index(ele) | |
| ls = ls[:id] + [i for i in ele1_ls if i] + ls[id + 1:] | |
| return ls | |