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Filename : naturalCompare.js
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'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true,
});
exports.naturalCompare = naturalCompare;

/**
 * Returns a number indicating whether a reference string comes before, or after,
 * or is the same as the given string in natural sort order.
 *
 * See: https://en.wikipedia.org/wiki/Natural_sort_order
 *
 */
function naturalCompare(aStr, bStr) {
  let aIndex = 0;
  let bIndex = 0;

  while (aIndex < aStr.length && bIndex < bStr.length) {
    let aChar = aStr.charCodeAt(aIndex);
    let bChar = bStr.charCodeAt(bIndex);

    if (isDigit(aChar) && isDigit(bChar)) {
      let aNum = 0;

      do {
        ++aIndex;
        aNum = aNum * 10 + aChar - DIGIT_0;
        aChar = aStr.charCodeAt(aIndex);
      } while (isDigit(aChar) && aNum > 0);

      let bNum = 0;

      do {
        ++bIndex;
        bNum = bNum * 10 + bChar - DIGIT_0;
        bChar = bStr.charCodeAt(bIndex);
      } while (isDigit(bChar) && bNum > 0);

      if (aNum < bNum) {
        return -1;
      }

      if (aNum > bNum) {
        return 1;
      }
    } else {
      if (aChar < bChar) {
        return -1;
      }

      if (aChar > bChar) {
        return 1;
      }

      ++aIndex;
      ++bIndex;
    }
  }

  return aStr.length - bStr.length;
}

const DIGIT_0 = 48;
const DIGIT_9 = 57;

function isDigit(code) {
  return !isNaN(code) && DIGIT_0 <= code && code <= DIGIT_9;
}