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// This file is taken from Node.js project. // Full implementation can be found from https://github.com/nodejs/node/blob/main/lib/internal/querystring.js const hexTable = Array.from( { length: 256 }, (_, i) => "%" + ((i < 16 ? "0" : "") + i.toString(16)).toUpperCase(), ); // These characters do not need escaping when generating query strings: // ! - . _ ~ // ' ( ) * // digits // alpha (uppercase) // alpha (lowercase) // rome-ignore format: the array should not be formatted const noEscape = new Int8Array([ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, // 32 - 47 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, // 80 - 95 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, // 112 - 127 ]); /** * @param {string} str * @returns {string} */ function encodeString(str) { const len = str.length; if (len === 0) return ""; let out = ""; let lastPos = 0; let i = 0; outer: for (; i < len; i++) { let c = str.charCodeAt(i); // ASCII while (c < 0x80) { if (noEscape[c] !== 1) { if (lastPos < i) out += str.slice(lastPos, i); lastPos = i + 1; out += hexTable[c]; } if (++i === len) break outer; c = str.charCodeAt(i); } if (lastPos < i) out += str.slice(lastPos, i); // Multi-byte characters ... if (c < 0x800) { lastPos = i + 1; out += hexTable[0xc0 | (c >> 6)] + hexTable[0x80 | (c & 0x3f)]; continue; } if (c < 0xd800 || c >= 0xe000) { lastPos = i + 1; out += hexTable[0xe0 | (c >> 12)] + hexTable[0x80 | ((c >> 6) & 0x3f)] + hexTable[0x80 | (c & 0x3f)]; continue; } // Surrogate pair ++i; // This branch should never happen because all URLSearchParams entries // should already be converted to USVString. But, included for // completion's sake anyway. if (i >= len) { throw new Error("URI malformed"); } const c2 = str.charCodeAt(i) & 0x3ff; lastPos = i + 1; c = 0x10000 + (((c & 0x3ff) << 10) | c2); out += hexTable[0xf0 | (c >> 18)] + hexTable[0x80 | ((c >> 12) & 0x3f)] + hexTable[0x80 | ((c >> 6) & 0x3f)] + hexTable[0x80 | (c & 0x3f)]; } if (lastPos === 0) return str; if (lastPos < len) return out + str.slice(lastPos); return out; } module.exports = { encodeString };