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Runtime error
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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 };
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