// adapted from http://nedbatchelder.com/blog/200712.html#e20071211T054956
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var NUMBER_PATTERN = /([0-9]+)/;
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function naturalCompare(value1, value2) {
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var keys1 = ('' + value1).split(NUMBER_PATTERN).map(tryParseInt);
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var keys2 = ('' + value2).split(NUMBER_PATTERN).map(tryParseInt);
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var key1;
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var key2;
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var compareFirst = Math.min(keys1.length, keys2.length);
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var i, l;
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for (i = 0, l = compareFirst; i < l; i++) {
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key1 = keys1[i];
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key2 = keys2[i];
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if (key1 != key2) {
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return key1 > key2 ? 1 : -1;
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}
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}
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return keys1.length > keys2.length ? 1 : (keys1.length == keys2.length ? 0 : -1);
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}
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function tryParseInt(value) {
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return ('' + parseInt(value)) == value ?
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parseInt(value) :
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value;
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}
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module.exports = naturalCompare;
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