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- import re
- class Porter:
- PERFECTIVEGROUND = re.compile(u"((ив|ивши|ившись|ыв|ывши|ывшись)|((?<=[ая])(в|вши|вшись)))$")
- REFLEXIVE = re.compile(u"(с[яь])$")
- ADJECTIVE = re.compile(u"(ее|ие|ые|ое|ими|ыми|ей|ий|ый|ой|ем|им|ым|ом|его|ого|ему|ому|их|ых|ую|юю|ая|яя|ою|ею)$")
- PARTICIPLE = re.compile(u"((ивш|ывш|ующ)|((?<=[ая])(ем|нн|вш|ющ|щ)))$")
- VERB = re.compile(
- u"((ила|ыла|ена|ейте|уйте|ите|или|ыли|ей|уй|ил|ыл|им|ым|ен|ило|ыло|ено|ят|ует|уют|ит|ыт|ены|ить|ыть|ишь|ую|ю)|"
- u"((?<=[ая])(ла|на|ете|йте|ли|й|л|ем|н|ло|но|ет|ют|ны|ть|ешь|нно)))$")
- NOUN = re.compile(
- u"(а|ев|ов|ие|ье|е|иями|ями|ами|еи|ии|и|ией|ей|ой|ий|й|иям|ям|ием|ем|ам|ом|о|у|ах|иях|ях|ы|ь|ию|ью|ю|ия|ья|я)$")
- RVRE = re.compile(u"^(.*?[аеиоуыэюя])(.*)$")
- DERIVATIONAL = re.compile(u".*[^аеиоуыэюя]+[аеиоуыэюя].*ость?$")
- DER = re.compile(u"ость?$")
- SUPERLATIVE = re.compile(u"(ейше|ейш)$")
- I = re.compile(u"и$")
- P = re.compile(u"ь$")
- NN = re.compile(u"нн$")
- def stem(word):
- word = word.lower()
- word = word.replace(u'ё', u'е')
- m = re.match(Porter.RVRE, word)
- if m and m.groups():
- pre = m.group(1)
- rv = m.group(2)
- temp = Porter.PERFECTIVEGROUND.sub('', rv, 1)
- if temp == rv:
- rv = Porter.REFLEXIVE.sub('', rv, 1)
- temp = Porter.ADJECTIVE.sub('', rv, 1)
- if temp != rv:
- rv = temp
- rv = Porter.PARTICIPLE.sub('', rv, 1)
- else:
- temp = Porter.VERB.sub('', rv, 1)
- if temp == rv:
- rv = Porter.NOUN.sub('', rv, 1)
- else:
- rv = temp
- else:
- rv = temp
- rv = Porter.I.sub('', rv, 1)
- if re.match(Porter.DERIVATIONAL, rv):
- rv = Porter.DER.sub('', rv, 1)
- temp = Porter.P.sub('', rv, 1)
- if temp == rv:
- rv = Porter.SUPERLATIVE.sub('', rv, 1)
- rv = Porter.NN.sub(u'н', rv, 1)
- else:
- rv = temp
- word = pre + rv
- return word
- stem = staticmethod(stem)
- if __name__ == '__main__':
- print(Porter.stem(u'устойчивость'))
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