mirror of https://github.com/explosion/spaCy.git
143 lines
5.2 KiB
Python
143 lines
5.2 KiB
Python
# coding: utf8
|
|
from __future__ import unicode_literals
|
|
|
|
from ...lemmatizer import Lemmatizer
|
|
from ...symbols import POS, NOUN, VERB, ADJ, ADV, PRON, DET, AUX, PUNCT, ADP
|
|
from ...symbols import SCONJ, CCONJ
|
|
from ...symbols import VerbForm_inf, VerbForm_none, Number_sing, Degree_pos
|
|
|
|
|
|
class FrenchLemmatizer(Lemmatizer):
|
|
"""
|
|
French language lemmatizer applies the default rule based lemmatization
|
|
procedure with some modifications for better French language support.
|
|
|
|
The parts of speech 'ADV', 'PRON', 'DET', 'ADP' and 'AUX' are added to use
|
|
the rule-based lemmatization. As a last resort, the lemmatizer checks in
|
|
the lookup table.
|
|
"""
|
|
|
|
def __call__(self, string, univ_pos, morphology=None):
|
|
lookup_table = self.lookups.get_table("lemma_lookup", {})
|
|
if "lemma_rules" not in self.lookups:
|
|
return [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 (ADP, "ADP", "adp"):
|
|
univ_pos = "adp"
|
|
elif univ_pos in (ADV, "ADV", "adv"):
|
|
univ_pos = "adv"
|
|
elif univ_pos in (AUX, "AUX", "aux"):
|
|
univ_pos = "aux"
|
|
elif univ_pos in (CCONJ, "CCONJ", "cconj"):
|
|
univ_pos = "cconj"
|
|
elif univ_pos in (DET, "DET", "det"):
|
|
univ_pos = "det"
|
|
elif univ_pos in (PRON, "PRON", "pron"):
|
|
univ_pos = "pron"
|
|
elif univ_pos in (PUNCT, "PUNCT", "punct"):
|
|
univ_pos = "punct"
|
|
elif univ_pos in (SCONJ, "SCONJ", "sconj"):
|
|
univ_pos = "sconj"
|
|
else:
|
|
return [self.lookup(string)]
|
|
# See Issue #435 for example of where this logic is requied.
|
|
if self.is_base_form(univ_pos, morphology):
|
|
return list(set([string.lower()]))
|
|
index_table = self.lookups.get_table("lemma_index", {})
|
|
exc_table = self.lookups.get_table("lemma_exc", {})
|
|
rules_table = self.lookups.get_table("lemma_rules", {})
|
|
lemmas = self.lemmatize(
|
|
string,
|
|
index_table.get(univ_pos, {}),
|
|
exc_table.get(univ_pos, {}),
|
|
rules_table.get(univ_pos, []),
|
|
)
|
|
return lemmas
|
|
|
|
def is_base_form(self, univ_pos, morphology=None):
|
|
"""
|
|
Check whether we're dealing with an uninflected paradigm, so we can
|
|
avoid lemmatization entirely.
|
|
"""
|
|
morphology = {} if morphology is None else morphology
|
|
others = [
|
|
key
|
|
for key in morphology
|
|
if key not in (POS, "Number", "POS", "VerbForm", "Tense")
|
|
]
|
|
if univ_pos == "noun" and morphology.get("Number") == "sing":
|
|
return True
|
|
elif univ_pos == "verb" and morphology.get("VerbForm") == "inf":
|
|
return True
|
|
# This maps 'VBP' to base form -- probably just need 'IS_BASE'
|
|
# morphology
|
|
elif univ_pos == "verb" and (
|
|
morphology.get("VerbForm") == "fin"
|
|
and morphology.get("Tense") == "pres"
|
|
and morphology.get("Number") is None
|
|
and not others
|
|
):
|
|
return True
|
|
elif univ_pos == "adj" and morphology.get("Degree") == "pos":
|
|
return True
|
|
elif VerbForm_inf in morphology:
|
|
return True
|
|
elif VerbForm_none in morphology:
|
|
return True
|
|
elif Number_sing in morphology:
|
|
return True
|
|
elif Degree_pos in morphology:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
def noun(self, string, morphology=None):
|
|
return self(string, "noun", morphology)
|
|
|
|
def verb(self, string, morphology=None):
|
|
return self(string, "verb", morphology)
|
|
|
|
def adj(self, string, morphology=None):
|
|
return self(string, "adj", morphology)
|
|
|
|
def punct(self, string, morphology=None):
|
|
return self(string, "punct", morphology)
|
|
|
|
def lookup(self, string, orth=None):
|
|
lookup_table = self.lookups.get_table("lemma_lookup", {})
|
|
if orth is not None and orth in lookup_table:
|
|
return lookup_table[orth][0]
|
|
return string
|
|
|
|
def lemmatize(self, string, index, exceptions, rules):
|
|
lookup_table = self.lookups.get_table("lemma_lookup", {})
|
|
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 and string in lookup_table.keys():
|
|
forms.append(lookup_table[string][0])
|
|
if not forms:
|
|
forms.append(string)
|
|
return list(set(forms))
|