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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
const koRegex1 = /[나-낳]/g;
const koRegex2 = /(다$)|(다(?=\.))|(다(?= ))|(다(?=!))|(다(?=\?))/gm;
const koRegex3 = /(야(?=\?))|(야$)|(야(?= ))/gm;
function ifAfter(prefix, fn) {
const preLen = prefix.length;
const regex = new RegExp(prefix, 'i');
return (x, pos, string) => {
return pos > 0 && string.substring(pos - preLen, pos).match(regex) ? fn(x) : x;
};
}
export function nyaize(text: string): string {
return text
// ja-JP
.replaceAll('な', 'にゃ').replaceAll('ナ', 'ニャ').replaceAll('ﾅ', 'ﾆｬ')
// en-US
.replace(/a/gi, ifAfter('n', x => x === 'A' ? 'YA' : 'ya'))
.replace(/ing/gi, ifAfter('morn', x => x === 'ING' ? 'YAN' : 'yan'))
.replace(/one/gi, ifAfter('every', x => x === 'ONE' ? 'NYAN' : 'nyan'))
// ko-KR
.replace(koRegex1, match => String.fromCharCode(
match.charCodeAt(0) + '냐'.charCodeAt(0) - '나'.charCodeAt(0),
))
.replace(koRegex2, '다냥')
.replace(koRegex3, '냥');
}
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