mirror of
https://github.com/explosion/spaCy.git
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70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
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# coding: utf8
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from __future__ import unicode_literals
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from ....symbols import NOUN, VERB, ADJ, PUNCT
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'''
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Greek language lemmatizer applies the default rule based lemmatization
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procedure with some modifications for better Greek language support.
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The first modification is that it checks if the word for lemmatization is
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already a lemma and if yes, it just returns it.
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The second modification is about removing the base forms function which is
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not applicable for Greek language.
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'''
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class GreekLemmatizer(object):
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@classmethod
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def load(cls, path, index=None, exc=None, rules=None, lookup=None):
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return cls(index, exc, rules, lookup)
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def __init__(self, index=None, exceptions=None, rules=None, lookup=None):
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self.index = index
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self.exc = exceptions
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self.rules = rules
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self.lookup_table = lookup if lookup is not None else {}
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def __call__(self, string, univ_pos, morphology=None):
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if not self.rules:
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return [self.lookup_table.get(string, string)]
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if univ_pos in (NOUN, 'NOUN', 'noun'):
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univ_pos = 'noun'
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elif univ_pos in (VERB, 'VERB', 'verb'):
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univ_pos = 'verb'
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elif univ_pos in (ADJ, 'ADJ', 'adj'):
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univ_pos = 'adj'
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elif univ_pos in (PUNCT, 'PUNCT', 'punct'):
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univ_pos = 'punct'
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else:
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return list(set([string.lower()]))
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lemmas = lemmatize(string, self.index.get(univ_pos, {}),
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self.exc.get(univ_pos, {}),
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self.rules.get(univ_pos, []))
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return lemmas
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def lemmatize(string, index, exceptions, rules):
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string = string.lower()
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forms = []
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if (string in index):
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forms.append(string)
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return forms
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forms.extend(exceptions.get(string, []))
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oov_forms = []
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if not forms:
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for old, new in rules:
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if string.endswith(old):
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form = string[:len(string) - len(old)] + new
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if not form:
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pass
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elif form in index or not form.isalpha():
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forms.append(form)
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else:
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oov_forms.append(form)
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if not forms:
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forms.extend(oov_forms)
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if not forms:
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forms.append(string)
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return list(set(forms))
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