Function encodeStr

lib/internal/querystring.js:45–113

* @param {string} str * @param {Int8Array} noEscapeTable * @param {string[]} hexTable * @returns {string}

(str, noEscapeTable, hexTable)

 * @returns {string}
 */
function encodeStr(str, noEscapeTable, hexTable) {
  const len = str.length;
  if (len === 0)
    return '';

  let out = '';
  let lastPos = 0;
  let i = 0;

  outer:
  for (; i < len; i++) {
    let c = StringPrototypeCharCodeAt(str, i);

    // ASCII
    while (c < 0x80) {
      if (noEscapeTable[c] !== 1) {
        if (lastPos < i)
          out += StringPrototypeSlice(str, lastPos, i);
        lastPos = i + 1;
        out += hexTable[c];
      }

      if (++i === len)
        break outer;

      c = StringPrototypeCharCodeAt(str, i);
    }

    if (lastPos < i)
      out += StringPrototypeSlice(str, 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 ERR_INVALID_URI();

    const c2 = StringPrototypeCharCodeAt(str, i) & 0x3FF;

    lastPos = i + 1;
    c = 0x10000 + (((c & 0x3FF) << 10) | c2);