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yomichan-anki/yomi_base/japanese/deinflect.py

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# -*- coding: utf-8 -*-
# Copyright (C) 2013 Alex Yatskov
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import codecs
import json
import re
#
# Deinflection
#
class Deinflection:
def __init__(self, term, tags=list(), rule=str()):
self.children = list()
self.term = term
self.tags = tags
self.rule = rule
self.success = False
def validate(self, validator):
for tags in validator(self.term):
if len(self.tags) == 0:
return True
for tag in self.tags:
if self.searchTags(tag, tags):
return True
def deinflect(self, validator, rules):
if self.validate(validator):
child = Deinflection(self.term)
self.children.append(child)
for rule, variants in rules.items():
for variant in variants:
tagsIn = variant['tagsIn']
tagsOut = variant['tagsOut']
kanaIn = variant['kanaIn']
kanaOut = variant['kanaOut']
allowed = len(self.tags) == 0
for tag in self.tags:
if self.searchTags(tag, tagsIn):
allowed = True
break
if not allowed or not self.term.endswith(kanaIn):
continue
term = self.term[:-len(kanaIn)] + kanaOut
child = Deinflection(term, tagsOut, rule)
if child.deinflect(validator, rules):
self.children.append(child)
if len(self.children) > 0:
return True
def searchTags(self, tag, tags):
for t in tags:
if re.search(tag, t):
return True
def gather(self):
if len(self.children) == 0:
return [{'root': self.term, 'rules': list()}]
paths = list()
for child in self.children:
for path in child.gather():
if self.rule:
path['rules'].append(self.rule)
path['source'] = self.term
paths.append(path)
return paths
#
# Deinflector
#
class Deinflector:
def __init__(self, filename):
with codecs.open(filename, 'rb', 'utf-8') as fp:
self.rules = json.load(fp)
def deinflect(self, term, validator):
node = Deinflection(term)
if node.deinflect(validator, self.rules):
return node.gather()