yomichan/ext/bg/deinflector.js

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/*
* Copyright (C) 2016 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* 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/>.
*/
class Deinflection {
constructor(term, tags=[], rule='') {
this.children = [];
this.term = term;
this.tags = tags;
this.rule = rule;
}
validate(validator) {
for (const tags of validator(this.term)) {
if (this.tags.length === 0) {
return true;
}
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for (const tag of this.tags) {
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if (this.searchTags(tag, tags)) {
return true;
}
}
}
return false;
}
deinflect(validator, rules) {
if (this.validate(validator)) {
const child = new Deinflection(this.term);
this.children.push(child);
}
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for (const rule in rules) {
const variants = rules[rule];
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for (const v of variants) {
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let allowed = this.tags.length === 0;
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for (const tag of this.tags) {
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if (this.searchTags(tag, v.tagsIn)) {
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allowed = true;
break;
}
}
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if (!allowed || !this.term.endsWith(v.kanaIn)) {
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continue;
}
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const term = this.term.slice(0, -v.kanaIn.length) + v.kanaOut;
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const child = new Deinflection(term, v.tagsOut, rule);
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if (child.deinflect(validator, rules)) {
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this.children.push(child);
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}
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}
}
return this.children.length > 0;
}
searchTags(tag, tags) {
for (const t of tags) {
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const re = new RegExp(tag);
if (re.test(t)) {
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return true;
}
}
return false;
}
gather() {
if (this.children.length === 0) {
return [{root: this.term, rules: []}];
}
const paths = [];
for (const child of this.children) {
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for (const path of child.gather()) {
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if (this.rule.length > 0) {
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path.rules.push(this.rule);
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}
path.source = this.term;
paths.push(path);
}
}
return paths;
}
}
class Deinflector {
constructor() {
this.rules = {};
}
setRules(rules) {
this.rules = rules;
}
deinflect(term, validator) {
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const node = new Deinflection(term);
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if (node.deinflect(validator, this.rules)) {
return node.gather();
}
return null;
}
}