/**
                             * The A.ArraySort Utility - A set of utility methods to the ArraySort.
                             *
                             * @module aui-arraysort
                             */
                            
                            var ASort = A.ArraySort;
                            
                            /**
                             * Augment the [YUI3 ArraySort](ArraySort.html) with more util methods.
                             *
                             * @class A.ArraySort
                             * @uses ArraySort
                             * @constructor
                             */
                            A.mix(
                                ASort, {
                                    /**
                                     * Compare two arrays ignoring white spaces.
                                     *
                                     * @method compareIgnoreWhiteSpace
                                     * @param a
                                     * @param b
                                     * @param desc
                                     * @param compareFn
                                     * @return sort
                                     */
                                    compareIgnoreWhiteSpace: function(a, b, desc, compareFn) {
                                        var sort;
                            
                                        compareFn = compareFn || ASort.compare;
                            
                                        if ((a === '') && (b === '')) {
                                            sort = 0;
                                        }
                                        else if (a === '') {
                                            sort = 1;
                                        }
                                        else if (b === '') {
                                            sort = -1;
                                        }
                                        else {
                                            sort = compareFn.apply(this, arguments);
                                        }
                            
                                        return sort;
                                    },
                            
                                    /**
                                     * Sorts an object array keeping the order of equal items. ECMA script
                                     * standard does not specify the behaviour when the compare function
                                     * returns the value 0;
                                     *
                                     * @method stableSort
                                     * @param array
                                     * @param compareFn
                                     */
                                    stableSort: function(array, compareFn) {
                                        var i, len = array.length;
                            
                                        for (i = 0; i < len; i++) {
                                            array[i] = {
                                                index: i,
                                                value: array[i]
                                            };
                                        }
                            
                                        array.sort(
                                            function(a, b) {
                                                var result = compareFn.call(array, a.value, b.value);
                            
                                                return (result === 0) ? (a.index - b.index) : result;
                                            }
                                        );
                            
                                        for (i = 0; i < len; i++) {
                                            array[i] = array[i].value;
                                        }
                                    }
                                }
                            );