29 lines
759 B
JavaScript
29 lines
759 B
JavaScript
// Forked from https://github.com/jsdom/jsdom/blob/main/lib/jsdom/living/helpers/strings.js
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"use strict";
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/**
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* Converts a string to ASCII lowercase.
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*
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* @see https://infra.spec.whatwg.org/#ascii-lowercase
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* @param {string} s - The string to convert.
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* @returns {string} The converted string.
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*/
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function asciiLowercase(s) {
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if (!/[^\x00-\x7f]/.test(s)) {
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return s.toLowerCase();
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}
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const len = s.length;
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const out = new Array(len);
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for (let i = 0; i < len; i++) {
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const code = s.charCodeAt(i);
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// If the character is between 'A' (65) and 'Z' (90), convert using bitwise OR with 32
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out[i] = code >= 65 && code <= 90 ? String.fromCharCode(code | 32) : s[i];
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}
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return out.join("");
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}
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module.exports = {
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asciiLowercase
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};
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