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/*
* 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/>.
*/
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
]);
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