1// adapted from http://nedbatchelder.com/blog/200712.html#e20071211T054956
2
3var NUMBER_PATTERN = /([0-9]+)/;
4
5function naturalCompare(value1, value2) {
6  var keys1 = ('' + value1).split(NUMBER_PATTERN).map(tryParseInt);
7  var keys2 = ('' + value2).split(NUMBER_PATTERN).map(tryParseInt);
8  var key1;
9  var key2;
10  var compareFirst = Math.min(keys1.length, keys2.length);
11  var i, l;
12
13  for (i = 0, l = compareFirst; i < l; i++) {
14    key1 = keys1[i];
15    key2 = keys2[i];
16
17    if (key1 != key2) {
18      return key1 > key2 ? 1 : -1;
19    }
20  }
21
22  return keys1.length > keys2.length ? 1 : (keys1.length == keys2.length ? 0 : -1);
23}
24
25function tryParseInt(value) {
26  return ('' + parseInt(value)) == value ?
27    parseInt(value) :
28    value;
29}
30
31module.exports = naturalCompare;
32