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File: jquery.sortElements.js
/**
 * Copyright (c) 2010 James Padolsey
 * -------------------------------------------------------
 * Dual licensed under the MIT and GPL licenses.
 *	- http://www.opensource.org/licenses/mit-license.php
 *	- http://www.gnu.org/copyleft/gpl.html
 *
 * (License from http://james.padolsey.com/terms-conditions/ 2011-12-01;
 * code from https://github.com/padolsey/jQuery-Plugins/blob/master/
 * sortElements/jquery.sortElements.js, linked from http://james.padolsey.com/
 * javascript/sorting-elements-with-jquery/, also 2011-12-01 - AS)
 */

/**
 * jQuery.fn.sortElements
 * --------------
 * @author James Padolsey (http://james.padolsey.com)
 * @version 0.11
 * @updated 18-MAR-2010
 * --------------
 * @param Function comparator:
 *   Exactly the same behaviour as [1,2,3].sort(comparator)
 *   
 * @param Function getSortable
 *   A function that should return the element that is
 *   to be sorted. The comparator will run on the
 *   current collection, but you may want the actual
 *   resulting sort to occur on a parent or another
 *   associated element.
 *   
 *   E.g. $('td').sortElements(comparator, function(){
 *      return this.parentNode; 
 *   })
 *   
 *   The <td>'s parent (<tr>) will be sorted instead
 *   of the <td> itself.
 */
jQuery.fn.sortElements = (function(){
    
    var sort = [].sort;
    
    return function(comparator, getSortable) {
        
        getSortable = getSortable || function(){return this;};
        
        var placements = this.map(function(){
            
            var sortElement = getSortable.call(this),
                parentNode = sortElement.parentNode,
                
                // Since the element itself will change position, we have
                // to have some way of storing it's original position in
                // the DOM. The easiest way is to have a 'flag' node:
                nextSibling = parentNode.insertBefore(
                    document.createTextNode(''),
                    sortElement.nextSibling
                );
            
            return function() {
                
                if (parentNode === this) {
                    throw new Error(
                        "You can't sort elements if any one is a descendant of another."
                    );
                }
                
                // Insert before flag:
                parentNode.insertBefore(this, nextSibling);
                // Remove flag:
                parentNode.removeChild(nextSibling);
                
            };
            
        });
       
        return sort.call(this, comparator).each(function(i){
            placements[i].call(getSortable.call(this));
        });
        
    };
    
})();