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