/* * 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) { const results = [this._createDeinflection(source, 0, [])]; 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(this._createDeinflection( term.substring(0, term.length - kanaIn.length) + kanaOut, rulesOut, [reason, ...reasons] )); } } } return results; } _createDeinflection(term, rules, reasons) { return {term, rules, reasons}; } 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, this.rulesToRuleFlags(rulesIn), this.rulesToRuleFlags(rulesOut) ]); } normalizedReasons.push([reason, variants]); } return normalizedReasons; } static rulesToRuleFlags(rules) { const ruleTypes = this._ruleTypes; let value = 0; for (const rule of rules) { const ruleBits = ruleTypes.get(rule); if (typeof ruleBits === 'undefined') { continue; } value |= ruleBits; } return value; } } // eslint-disable-next-line no-underscore-dangle 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 ]);