Function relative

lib/path.js:610–762

* It will solve the relative path from `from` to `to`, for instance * from = 'C:\\orandea\\test\\aaa' * to = 'C:\\orandea\\impl\\bbb' * The output of the function should be: '..\\..\\impl\\bbb' * @param {string} from * @param {string} to * @returns {string}

(from, to)

   * @returns {string}
   */
  relative(from, to) {
    validateString(from, 'from');
    validateString(to, 'to');

    if (from === to)
      return '';

    const fromOrig = win32.resolve(from);
    const toOrig = win32.resolve(to);

    if (fromOrig === toOrig)
      return '';

    from = StringPrototypeToLowerCase(fromOrig);
    to = StringPrototypeToLowerCase(toOrig);

    if (from === to)
      return '';

    if (fromOrig.length !== from.length || toOrig.length !== to.length) {
      const fromSplit = StringPrototypeSplit(fromOrig, '\\');
      const toSplit = StringPrototypeSplit(toOrig, '\\');
      if (fromSplit[fromSplit.length - 1] === '') {
        fromSplit.pop();
      }
      if (toSplit[toSplit.length - 1] === '') {
        toSplit.pop();
      }

      const fromLen = fromSplit.length;
      const toLen = toSplit.length;
      const length = fromLen < toLen ? fromLen : toLen;

      let i;
      for (i = 0; i < length; i++) {
        if (StringPrototypeToLowerCase(fromSplit[i]) !== StringPrototypeToLowerCase(toSplit[i])) {
          break;
        }
      }

      if (i === 0) {
        return toOrig;
      } else if (i === length) {
        if (toLen > length) {
          return ArrayPrototypeJoin(ArrayPrototypeSlice(toSplit, i), '\\');
        }
        if (fromLen > length) {
          return StringPrototypeRepeat('..\\', fromLen - 1 - i) + '..';
        }
        return '';
      }

      return StringPrototypeRepeat('..\\', fromLen - i) + ArrayPrototypeJoin(ArrayPrototypeSlice(toSplit, i), '\\');
    }

    // Trim any leading backslashes
    let fromStart = 0;
    while (fromStart < from.length &&