/*
 * @version    1.4.0
 * @date       2015-10-26
 * @stability  3 - Stable
 * @author     Lauri Rooden (https://github.com/litejs/natural-compare-lite)
 * @license    MIT License
 */


var naturalCompare = function(a, b) {
    var i, codeA
    , codeB = 1
    , posA = 0
    , posB = 0
    , alphabet = String.alphabet

    function getCode(str, pos, code) {
        if (code) {
            for (i = pos; code = getCode(str, i), code < 76 && code > 65;) ++i;
            return +str.slice(pos - 1, i)
        }
        code = alphabet && alphabet.indexOf(str.charAt(pos))
        return code > -1 ? code + 76 : ((code = str.charCodeAt(pos) || 0), code < 45 || code > 127) ? code
            : code < 46 ? 65               // -
            : code < 48 ? code - 1
            : code < 58 ? code + 18        // 0-9
            : code < 65 ? code - 11
            : code < 91 ? code + 11        // A-Z
            : code < 97 ? code - 37
            : code < 123 ? code + 5        // a-z
            : code - 63
    }


    if ((a+="") != (b+="")) for (;codeB;) {
        codeA = getCode(a, posA++)
        codeB = getCode(b, posB++)

        if (codeA < 76 && codeB < 76 && codeA > 66 && codeB > 66) {
            codeA = getCode(a, posA, posA)
            codeB = getCode(b, posB, posA = i)
            posB = i
        }

        if (codeA != codeB) return (codeA < codeB) ? -1 : 1
    }
    return 0
}

try {
    module.exports = naturalCompare;
} catch (e) {
    String.naturalCompare = naturalCompare;
}