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-rw-r--r--ext/bg/deinflector.js126
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diff --git a/ext/bg/deinflector.js b/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;
+ }
+
+ for (const tag of this.tags) {
+ 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);
+ }
+
+ for (const rule in rules) {
+ const variants = rules[rule];
+ for (const v of variants) {
+ let allowed = this.tags.length === 0;
+ for (const tag of this.tags) {
+ if (this.searchTags(tag, v.tagsIn)) {
+ allowed = true;
+ break;
+ }
+ }
+
+ if (!allowed || !this.term.endsWith(v.kanaIn)) {
+ continue;
+ }
+
+ const term = this.term.slice(0, -v.kanaIn.length) + v.kanaOut;
+ const child = new Deinflection(term, v.tagsOut, rule);
+ if (child.deinflect(validator, rules)) {
+ this.children.push(child);
+ }
+ }
+ }
+
+ return this.children.length > 0;
+ }
+
+ searchTags(tag, tags) {
+ for (const t of tags) {
+ const re = new RegExp(tag);
+ if (re.test(t)) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ gather() {
+ if (this.children.length === 0) {
+ return [{root: this.term, rules: []}];
+ }
+
+ const paths = [];
+ for (const child of this.children) {
+ for (const path of child.gather()) {
+ if (this.rule.length > 0) {
+ path.rules.push(this.rule);
+ }
+
+ path.source = this.term;
+ paths.push(path);
+ }
+ }
+
+ return paths;
+ }
+}
+
+
+class Deinflector {
+ constructor() {
+ this.rules = {};
+ }
+
+ setRules(rules) {
+ this.rules = rules;
+ }
+
+ deinflect(term, validator) {
+ const node = new Deinflection(term);
+ if (node.deinflect(validator, this.rules)) {
+ return node.gather();
+ }
+
+ return null;
+ }
+}