204 lines
7.2 KiB
Python
204 lines
7.2 KiB
Python
import re
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import unicodedata
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import jieba
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import logging
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from typing import List
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logger = logging.getLogger(__name__)
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jieba.setLogLevel(logging.INFO)
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class Serializer():
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def __init__(self, never_split: List = None, do_lower_case=True, do_chinese_split=False):
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self.never_split = never_split if never_split is not None else []
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self.do_lower_case = do_lower_case
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self.do_chinese_split = do_chinese_split
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def serialize(self, text, never_split: List = None):
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never_split = self.never_split + (never_split if never_split is not None else [])
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text = self._clean_text(text)
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if self.do_chinese_split:
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output_tokens = self._use_jieba_cut(text, never_split)
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return output_tokens
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text = self._tokenize_chinese_chars(text)
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orig_tokens = self._orig_tokenize(text)
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split_tokens = []
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for token in orig_tokens:
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if self.do_lower_case and token not in never_split:
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token = token.lower()
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token = self._run_strip_accents(token)
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split_tokens.extend(self._run_split_on_punc(token, never_split=never_split))
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output_tokens = self._whitespace_tokenize(" ".join(split_tokens))
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return output_tokens
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def _clean_text(self, text):
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"""Performs invalid character removal and whitespace cleanup on text."""
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output = []
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for char in text:
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cp = ord(char)
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if cp == 0 or cp == 0xfffd or self.is_control(char):
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continue
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if self.is_whitespace(char):
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output.append(" ")
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else:
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output.append(char)
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return "".join(output)
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def _use_jieba_cut(self, text, never_split):
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for word in never_split:
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jieba.suggest_freq(word, True)
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tokens = jieba.lcut(text)
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if self.do_lower_case:
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tokens = [i.lower() for i in tokens]
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try:
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while True:
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tokens.remove(' ')
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except:
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return tokens
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def _tokenize_chinese_chars(self, text):
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"""Adds whitespace around any CJK character."""
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output = []
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for char in text:
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cp = ord(char)
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if self.is_chinese_char(cp):
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output.append(" ")
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output.append(char)
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output.append(" ")
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else:
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output.append(char)
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return "".join(output)
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def _orig_tokenize(self, text):
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"""Splits text on whitespace and some punctuations like comma or period"""
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text = text.strip()
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if not text:
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return []
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# 常见的断句标点
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punc = """,.?!;: 、｜，。？！；：《》「」【】/<>|\“ ”‘ ’"""
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punc_re = '|'.join(re.escape(x) for x in punc)
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tokens = re.sub(punc_re, lambda x: ' ' + x.group() + ' ', text)
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tokens = tokens.split()
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return tokens
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def _whitespace_tokenize(self, text):
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"""Runs basic whitespace cleaning and splitting on a piece of text."""
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text = text.strip()
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if not text:
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return []
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tokens = text.split()
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return tokens
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def _run_strip_accents(self, text):
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"""Strips accents from a piece of text."""
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text = unicodedata.normalize("NFD", text)
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output = []
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for char in text:
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cat = unicodedata.category(char)
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if cat == "Mn":
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continue
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output.append(char)
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return "".join(output)
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def _run_split_on_punc(self, text, never_split=None):
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"""Splits punctuation on a piece of text."""
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if never_split is not None and text in never_split:
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return [text]
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chars = list(text)
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i = 0
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start_new_word = True
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output = []
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while i < len(chars):
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char = chars[i]
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if self.is_punctuation(char):
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output.append([char])
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start_new_word = True
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else:
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if start_new_word:
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output.append([])
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start_new_word = False
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output[-1].append(char)
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i += 1
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return ["".join(x) for x in output]
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@staticmethod
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def is_control(char):
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"""Checks whether `chars` is a control character."""
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# These are technically control characters but we count them as whitespace
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# characters.
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if char == "\t" or char == "\n" or char == "\r":
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return False
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cat = unicodedata.category(char)
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if cat.startswith("C"):
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return True
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return False
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@staticmethod
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def is_whitespace(char):
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"""Checks whether `chars` is a whitespace character."""
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# \t, \n, and \r are technically contorl characters but we treat them
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# as whitespace since they are generally considered as such.
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if char == " " or char == "\t" or char == "\n" or char == "\r":
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return True
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cat = unicodedata.category(char)
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if cat == "Zs":
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return True
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return False
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@staticmethod
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def is_chinese_char(cp):
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"""Checks whether CP is the codepoint of a CJK character."""
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# This defines a "chinese character" as anything in the CJK Unicode block:
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# https://en.wikipedia.org/wiki/CJK_Unified_Ideographs_(Unicode_block)
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#
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# Note that the CJK Unicode block is NOT all Japanese and Korean characters,
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# despite its name. The modern Korean Hangul alphabet is a different block,
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# as is Japanese Hiragana and Katakana. Those alphabets are used to write
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# space-separated words, so they are not treated specially and handled
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# like the all of the other languages.
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if ((cp >= 0x4E00 and cp <= 0x9FFF) or #
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(cp >= 0x3400 and cp <= 0x4DBF) or #
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(cp >= 0x20000 and cp <= 0x2A6DF) or #
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(cp >= 0x2A700 and cp <= 0x2B73F) or #
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(cp >= 0x2B740 and cp <= 0x2B81F) or #
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(cp >= 0x2B820 and cp <= 0x2CEAF) or (cp >= 0xF900 and cp <= 0xFAFF) or #
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(cp >= 0x2F800 and cp <= 0x2FA1F)): #
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return True
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return False
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@staticmethod
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def is_punctuation(char):
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"""Checks whether `chars` is a punctuation character."""
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cp = ord(char)
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# We treat all non-letter/number ASCII as punctuation.
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# Characters such as "^", "$", and "`" are not in the Unicode
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# Punctuation class but we treat them as punctuation anyways, for
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# consistency.
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if ((cp >= 33 and cp <= 47) or (cp >= 58 and cp <= 64) or (cp >= 91 and cp <= 96)
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or (cp >= 123 and cp <= 126)):
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return True
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cat = unicodedata.category(char)
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if cat.startswith("P"):
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return True
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return False
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if __name__ == '__main__':
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text1 = "\t\n你 好呀， I\'m his pupp\'peer,\n\t"
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text2 = '你孩子的爱情叫 Stam\'s 的打到天啊呢哦'
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serializer = Serializer(do_chinese_split=False)
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print(serializer.serialize(text1))
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print(serializer.serialize(text2))
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text3 = "good\'s head pupp\'er, "
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# print: ["good's", 'pupp', "'", 'er', ',']
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# true: ["good's", "pupp'er", ","]
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print(serializer.serialize(text3, never_split=["pupp\'er"]))
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