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from typing import List, Tuple
import json
import os.path as osp
import os
HALF2FULL = {i: i + 0xFEE0 for i in range(0x21, 0x7F)}
HALF2FULL[0x20] = 0x3000
FULL2HALF = dict((i + 0xFEE0, i) for i in range(0x21, 0x7F))
FULL2HALF[0x3000] = 0x20
FULL2HALF[0x3002] = 0x2E
LANGSET_CJK = {'简体中文', '繁體中文', '日本語'}
LANGSET_CH = {'简体中文', '繁體中文'}
PUNSET_RIGHT_ENG = {'.', '?', '!', ':', ';', ')', '}', "\""}
PUNCTUATION_L = {'「', '『', '【', '《', '〈', '〔', '［', '｛', '（', '(', '[', '{', '“', '‘'}
PKUSEG_PUNCSET = {' ', '.', ' '}
PKUSEGPATH = r'data/pkusegscores.json'
PKUSEGSCORES = None
CHSEG = None
def full_len(s: str):
"""
Convert all ASCII characters to their full-width counterpart.
https://stackoverflow.com/questions/2422177/python-how-can-i-replace-full-width-characters-with-half-width-characters
"""
return s.translate(HALF2FULL)
def half_len(s):
'''
Convert full-width characters to ASCII counterpart
'''
return s.translate(FULL2HALF)
def seg_to_chars(text: str) -> List[str]:
text = text.replace('\n', '')
return [c for c in text]
def seg_eng(text: str) -> List[str]:
text = text.replace(' ', ' ').replace(' .', '.').replace('\n', ' ')
processed_text = ''
# dumb way to insure spaces between words
text_len = len(text)
for ii, c in enumerate(text):
if c in PUNSET_RIGHT_ENG and ii < text_len - 1:
next_c = text[ii + 1]
if next_c.isalpha() or next_c.isnumeric():
processed_text += c + ' '
else:
processed_text += c
else:
processed_text += c
word_list = processed_text.split(' ')
word_num = len(word_list)
if word_num <= 1:
return word_list
words = []
skip_next = False
for ii, word in enumerate(word_list):
if skip_next:
skip_next = False
continue
if len(word) < 3:
append_left, append_right = False, False
len_word, len_next, len_prev = len(word), -1, -1
if ii < word_num - 1:
len_next = len(word_list[ii + 1])
if ii > 0:
len_prev = len(words[-1])
cond_next = (len_word == 2 and len_next <= 4) or len_word == 1
cond_prev = (len_word == 2 and len_prev <= 4) or len_word == 1
if len_next > 0 and len_prev > 0:
if len_next < len_prev:
append_right = cond_next
else:
append_left = cond_prev
elif len_next > 0:
append_right = cond_next
elif len_prev > 0:
append_left = cond_prev
if append_left:
words[-1] = words[-1] + ' ' + word
elif append_right:
words.append(word + ' ' + word_list[ii + 1])
skip_next = True
else:
words.append(word)
continue
words.append(word)
return words
def _seg_ch_pkg(text: str) -> List[str]:
if text == ' ':
return [' ']
elif text == '':
return []
segments = CHSEG.cut(text)
num_segments = len(segments)
if num_segments == 0:
return []
if num_segments == 1:
return [segments[0][0]]
words = []
tags = []
max_concat_len = 4
skip_next = False
try:
for ii, (word, tag) in enumerate(segments):
if skip_next:
skip_next = False
continue
len_word, len_next, len_prev = len(word), -1, -1
next_valid, prev_valid = False, False
word_next, tag_next = '', ''
word_prev, tag_prev = '', ''
score_next, score_prev = 0, 0
if ii < num_segments - 1:
word_next, tag_next = segments[ii + 1]
len_next = len(word_next)
next_valid = True
if tag_next != 'w' and not word_next in PKUSEG_PUNCSET:
score_next = PKUSEGSCORES[tag][tag_next]
if ii > 0:
word_prev, tag_prev = words[-1], segments[ii - 1][1]
len_prev = len(word_prev)
prev_valid = True
if tag_prev != 'w' and not word_prev[-1] in PKUSEG_PUNCSET:
score_prev = PKUSEGSCORES[tag_prev][tag]
append_prev, append_next = False, False
if tag == 'w' or word in PKUSEG_PUNCSET: # puntuation
if word in PUNCTUATION_L:
append_next = next_valid
elif len_word <= 1:
append_prev = prev_valid
else:
next_valid = score_next > 0 and len_next < max_concat_len
prev_valid = score_prev > 0 and len_prev < max_concat_len
need_concat = len_word < max_concat_len
append_prev = score_prev == 1
append_next = score_next == 1
if score_prev != 1 and score_next != 1 and need_concat:
append_prev = prev_valid
append_next = next_valid
if append_next and append_prev:
if len_prev == len_next:
if score_prev >= score_next:
append_next = False
else:
append_prev = False
elif len_prev < len_next:
append_next = False
else:
append_prev = False
if append_next and append_prev:
words[-1] = word_prev + word + word_next
tags[-1] = tags[-1] + [tag, tag_next]
skip_next = True
elif append_prev:
words[-1] = words[-1] + word
tags[-1].append(tag)
elif append_next:
words.append(word + word_next)
tags.append([tag, tag_next])
skip_next = True
else:
words.append(word)
tags.append([tag])
except Exception as e:
print('exp at line: ', text)
raise e
return words
def seg_ch_pkg(text: str):
global CHSEG
if CHSEG is None:
try:
import pkuseg
except:
import spacy_pkuseg as pkuseg
CHSEG = pkuseg.pkuseg(postag=True)
# pkuseg won't work with half-width punctuations
fullen_text = full_len(text).replace(' ', ' ')
cvt_back = False
if fullen_text != text:
cvt_back = True
text = fullen_text
global PKUSEGSCORES
if PKUSEGSCORES is None:
with open(PKUSEGPATH, 'r', encoding='utf8') as f:
PKUSEGSCORES = json.loads(f.read())
text_list = text.replace('\n', '').replace(' ', ' ').split(' ')
result_list = []
for ii, text in enumerate(text_list):
words = None
if text:
words = _seg_ch_pkg(text)
if words is not None:
if ii > 0:
words[0] = ' ' + words[0]
result_list.extend(words)
if cvt_back:
# pkuseg w
result_list = [half_len(word) for word in result_list]
return result_list
def seg_text(text: str, lang: str) -> Tuple[List, str]:
delimiter = ''
if lang in LANGSET_CH:
words = seg_ch_pkg(text)
elif lang in LANGSET_CJK:
words = seg_to_chars(text)
else:
words = seg_eng(text)
delimiter = ' '
return words, delimiter
def is_cjk(lang: str) -> bool:
return lang in LANGSET_CJK |