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/*
* Copyright (C) 2023 Yomitan Authors
* Copyright (C) 2016-2022 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/>.
*/
/**
* This class deinflects Japanese terms to its dictionary form.
*/
export class Deinflector {
/**
* @param {import('deinflector').ReasonsRaw} reasons
* @example
* const deinflectionReasons = JSON.parse(
* readFileSync(path.join('ext/data/deinflect.json')).toString(),
* ) as object;
* const deinflector = new Deinflector(deinflectionReasons);
*/
constructor(reasons) {
/** @type {import('deinflector').Reason[]} */
this.reasons = Deinflector.normalizeReasons(reasons);
}
/**
* Deinflects a Japanese term to all of its possible dictionary forms.
* @param {string} source The source term to deinflect.
* @returns {import('translation-internal').Deinflection[]}
* @example
* const deinflector = new Deinflector(deinflectionReasons);
* // [{ term: '食べた', rules: 0, reasons: [] }, { term: '食べる', rules: 1, reasons: ['past'] }, { term: '食ぶ', rules: 2, reasons: ['potential', 'past'] }]
* console.log(deinflector.deinflect('食べさせられる'));
*/
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;
}
/**
* @param {string} term
* @param {import('translation-internal').DeinflectionRuleFlags} rules
* @param {string[]} reasons
* @returns {import('translation-internal').Deinflection}
*/
_createDeinflection(term, rules, reasons) {
return {term, rules, reasons};
}
/**
* @param {import('deinflector').ReasonsRaw} reasons
* @returns {import('deinflector').Reason[]}
*/
static normalizeReasons(reasons) {
/** @type {import('deinflector').Reason[]} */
const normalizedReasons = [];
for (const [reason, reasonInfo] of Object.entries(reasons)) {
/** @type {import('deinflector').ReasonVariant[]} */
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;
}
/**
* Given a list of rules, return the corresponding deinflection rule flags.
* @param {string[]} rules
* @returns {import('translation-internal').DeinflectionRuleFlags}
*/
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 no-multi-spaces */
/** @type {Map<string, import('translation-internal').DeinflectionRuleFlags>} */
// eslint-disable-next-line no-underscore-dangle
Deinflector._ruleTypes = new Map([
['v1', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00000001)], // Verb ichidan
['v5', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00000010)], // Verb godan
['vs', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00000100)], // Verb suru
['vk', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00001000)], // Verb kuru
['vz', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00010000)], // Verb zuru
['adj-i', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00100000)], // Adjective i
['iru', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b01000000)] // Intermediate -iru endings for progressive or perfect tense
]);
/* eslint-enable no-multi-spaces */
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