import re
import jieba

from config import stop_words_path

class Word_Segment():
    def __init__(self, n_grams_flag=False):
        # 读取停用词表
        with open(stop_words_path, 'r', encoding='utf8', errors='ignore') as f:
            self.stop_words = set(f.read().split('\n'))
        self.n_grams_flag = n_grams_flag
        # 加载jieba模型
        load_jieba = jieba.lcut('load_jieba')

    def __call__(self, sentence):
        sentence = re.sub( r"[\-_—]", ' ', sentence)
        # 统一将大写转化为小写
        seg_list = jieba.lcut(sentence.lower())
        # 将分词列表中的数字变为空字符串
        seg_list = [re.sub(r'\d+\.?\d*%?', ' ', w) for w in seg_list]
        # 若词为停用词,则变为' '(方便后续进行n-grams组合)
        seg_list = [w if w not in self.stop_words else ' ' for w in seg_list]
        if self.n_grams_flag is True:
            seg_list = self.n_grams(seg_list)
        
        return [w.strip() for w in seg_list if w.strip() != '']

    # 计算分词后的词语n-grams组合
    def n_grams(self, seg_list):
        length = len(seg_list)
        for i in range(length):
            if i+1 < length and self.is_Chinese(seg_list[i]) and self.is_Chinese(seg_list[i+1]):
                seg_list.append(seg_list[i]+seg_list[i+1])
        return seg_list

    # 判断字符串是否为全为中文字符
    def is_Chinese(self, string):
        for char in string:
            if '\u4e00' <= char <= '\u9fff': 
                continue
            else: 
                return False
        return True if string != '' else False

if __name__ == "__main__":
    sentence = "中国选手张湘祥在奥运会上获得男子举重62*kg级冠军,挺举成绩是176*kg,图为他比赛时的照片"
    sentence = "f = m * a"
    word_seg = Word_Segment()
    seg_list = word_seg(sentence)
    print(seg_list)