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+/*
+ * Copyright (C) 2016-2021 Yomichan Authors
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+
+class Deinflector {
+ constructor(reasons) {
+ this.reasons = Deinflector.normalizeReasons(reasons);
+ }
+
+ deinflect(source, rawSource) {
+ const results = [{
+ source,
+ rawSource,
+ term: source,
+ rules: 0,
+ reasons: [],
+ databaseDefinitions: []
+ }];
+ for (let i = 0; i < results.length; ++i) {
+ const {rules, term, reasons} = results[i];
+ for (const [reason, variants] of this.reasons) {
+ for (const [kanaIn, kanaOut, rulesIn, rulesOut] of variants) {
+ if (
+ (rules !== 0 && (rules & rulesIn) === 0) ||
+ !term.endsWith(kanaIn) ||
+ (term.length - kanaIn.length + kanaOut.length) <= 0
+ ) {
+ continue;
+ }
+
+ results.push({
+ source,
+ rawSource,
+ term: term.substring(0, term.length - kanaIn.length) + kanaOut,
+ rules: rulesOut,
+ reasons: [reason, ...reasons],
+ databaseDefinitions: []
+ });
+ }
+ }
+ }
+ return results;
+ }
+
+ static normalizeReasons(reasons) {
+ const normalizedReasons = [];
+ for (const [reason, reasonInfo] of Object.entries(reasons)) {
+ const variants = [];
+ for (const {kanaIn, kanaOut, rulesIn, rulesOut} of reasonInfo) {
+ variants.push([
+ kanaIn,
+ kanaOut,
+ Deinflector.rulesToRuleFlags(rulesIn),
+ Deinflector.rulesToRuleFlags(rulesOut)
+ ]);
+ }
+ normalizedReasons.push([reason, variants]);
+ }
+ return normalizedReasons;
+ }
+
+ static rulesToRuleFlags(rules) {
+ const ruleTypes = Deinflector.ruleTypes;
+ let value = 0;
+ for (const rule of rules) {
+ const ruleBits = ruleTypes.get(rule);
+ if (typeof ruleBits === 'undefined') { continue; }
+ value |= ruleBits;
+ }
+ return value;
+ }
+}
+
+Deinflector.ruleTypes = new Map([
+ ['v1', 0b00000001], // Verb ichidan
+ ['v5', 0b00000010], // Verb godan
+ ['vs', 0b00000100], // Verb suru
+ ['vk', 0b00001000], // Verb kuru
+ ['vz', 0b00010000], // Verb zuru
+ ['adj-i', 0b00100000], // Adjective i
+ ['iru', 0b01000000] // Intermediate -iru endings for progressive or perfect tense
+]);