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YUI.add('arraysort', function (Y, NAME) {

/*jshint expr:true, onevar:false */

/**

Provides comparator functions useful for sorting arrays.

@module arraysort

**/

var LANG = Y.Lang,

    ISVALUE = LANG.isValue,

    ISSTRING = LANG.isString;

/**

Provides comparator functions useful for sorting arrays.

@class ArraySort

@static

**/

var ArraySort = Y.ArraySort = {

    // -- Public Methods -------------------------------------------------------

    /**

    Comparator function for simple case-insensitive sorting of an array of

    strings.

    @method compare

    @param a {Object} First sort argument.

    @param b {Object} Second sort argument.

    @param desc {Boolean} `true` if sort direction is descending, `false` if

        sort direction is ascending.

    @return {Boolean} -1 when a < b. 0 when a == b. 1 when a > b.

    @static

    */

    compare: function(a, b, desc) {

        if(!ISVALUE(a)) {

            if(!ISVALUE(b)) {

                return 0;

            }

            else {

                return 1;

            }

        }

        else if(!ISVALUE(b)) {

            return -1;

        }

        if(ISSTRING(a)) {

            a = a.toLowerCase();

        }

        if(ISSTRING(b)) {

            b = b.toLowerCase();

        }

        if(a < b) {

            return (desc) ? 1 : -1;

        }

        else if (a > b) {

            return (desc) ? -1 : 1;

        }

        else {

            return 0;

        }

    },

    /**

    Performs a natural-order comparison of two strings or numbers (or a string

    and a number). This ensures that a value like 'foo2' will be sorted before

    'foo10', whereas a standard ASCII sort would sort 'foo10' first.

    @example

        var items = ['item10', 'item2', 'item1', 10, '1', 2];

        items.sort(Y.ArraySort.naturalCompare);

        console.log(items); // => ['1', 2, 10, 'item1', 'item2', 'item10']

    @method naturalCompare

    @param {Number|String} a First value to compare.

    @param {Number|String} b Second value to compare.

    @param {Object} [options] Options.

        @param {Boolean} [options.caseSensitive=false] If `true`, a

            case-sensitive comparison will be performed. By default the

            comparison is case-insensitive.

        @param {Boolean} [options.descending=false] If `true`, the sort order

            will be reversed so that larger values are sorted before smaller

            values.

    @return {Number} `0` if the two items are equal, a negative number if _a_

        should be sorted before _b_, or a positive number if _b_ should be

        sorted before _a_.

    @static

    @since 3.11.0

    **/

    naturalCompare: function (a, b, options) {

        // Coerce `a` and `b` to strings.

        a += '';

        b += '';

        // Convert `a` and `b` to lowercase unless `options.caseSensitive` is

        // truthy.

        if (!options || !options.caseSensitive) {

            a = a.toLowerCase();

            b = b.toLowerCase();

        }

        // Split `a` and `b` into alpha parts and numeric parts.

        var aParts = ArraySort._splitAlphaNum(a),

            bParts = ArraySort._splitAlphaNum(b),

            length = Math.min(aParts.length, bParts.length),

            result = 0,

            aPart,

            bPart,

            i;

        // Compare each part of `a` with each part of `b`.

        for (i = 0; i < length; i++) {

            aPart = aParts[i];

            bPart = bParts[i];

            // If the two parts aren't equal, compare them and stop iterating.

            if (aPart !== bPart) {

                // First, try comparing them as numbers.

                result = aPart - bPart;

                // If that didn't work, compare them as strings. This falsiness

                // check works because `result` can't be 0 (we checked for

                // equality above) and NaN is falsy.

                if (!result) {

                    result = aPart > bPart ? 1 : -1;

                }

                // At this point we know enough to be able to sort the two

                // strings, so we don't need to compare any more parts.

                break;

            }

        }

        // If we get here and `result` is still 0, then sort the shorter string

        // before the longer string.

        result || (result = a.length - b.length);

        // Return the result, flipping the order if `options.descending` is

        // truthy.

        return options && options.descending ? -result : result;

    },

    // -- Protected Methods ----------------------------------------------------

    /**

    Splits a string into an array of alpha character and digit character parts.

    @example

        Y.ArraySort._splitAlphaNum('abc123def456');

        // => ['abc', '123', 'def', '456']

    @method _splitAlphaNum

    @param {String} string String to split.

    @return {String[]} Array of alpha parts and digit parts.

    @protected

    @static

    @since 3.11.0

    **/

    _splitAlphaNum: function (string) {

        /*jshint boss:true */

        var parts = [],

            regex = /(\d+|\D+)/g,

            match;

        while (match = regex.exec(string)) { // assignment

            parts.push(match[1]);

        }

        return parts;

    }

};

}, '3.18.1', {"requires": ["yui-base"]});