/* * Copyright (C) 2016-2017 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 Deinflector { constructor(reasons) { this.reasons = Deinflector.normalizeReasons(reasons); } deinflect(source) { const results = [{ source, term: source, rules: 0, definitions: [], reasons: [] }]; 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, term: term.slice(0, -kanaIn.length) + kanaOut, rules: rulesOut, definitions: [], reasons: [reason, ...reasons] }); } } } return results; } static normalizeReasons(reasons) { const normalizedReasons = []; for (const reason in reasons) { const variants = []; for (const {kanaIn, kanaOut, rulesIn, rulesOut} of reasons[reason]) { 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) { value |= ruleTypes[rule]; } return value; } } Deinflector.ruleTypes = { 'v1': 0b0000001, // Verb ichidan 'v5': 0b0000010, // Verb godan 'vs': 0b0000100, // Verb suru 'vk': 0b0001000, // Verb kuru 'adj-i': 0b0010000, // Adjective i 'iru': 0b0100000, // Intermediate -iru endings for progressive or perfect tense };