jQuery.expressions.js

/*!
 * $.expressions
 * (c) Stephen Middleton 2010
 *     Licensed under the MIT license
 *     <http://www.opensource.org/licenses/mit-license.html>
 * Makes an easier modifying method to add Psuedo Expressions
 * Syntax::
 * //no variables
 * $.expressions("hasText", function(ArgumentsArray, LocationInList, List){
 *   //if returns true, it will be in the list, otherwise it's be filtered out
 *   return $(this).text() !== "";
 * })
 * //one variable
 * $.expressions("text", function(ArgumentsArray, LocationInList, List){
 *   return $(this).text() === ArgumentsArray[0];
 * })
 * //multiple variables
 * $.expressions("data-Attr",function(ArgumentsArray, LocationInList, List){
 *   return $(this).attr("data-"+ArgumentsArray[0]) === ArgumentsArray[1];
 * })
 */
(function($){
   var   cache  = {},
         add = function(name,fn){
            if (typeof fn !== "function" && fn !== null) {
               throw new TypeError("fn must be Function or Null");
            }
            cache[name] = fn;
            $.expr[':'][name] = manage;
         },
         remove = function(name){
            cache[name] = $.expr[':'][name] = null;
         },
         manage = function(_this,curId,selCall,totalList){
            //console.log(cache,selCall[1],cache[selCall[1]],selCall);
            var vars = !!selCall[3]?selCall[3].split(selCall[2]+","+selCall[2]):[],
               fn = cache[selCall[1]];
            //*
            if (typeof fn !== "function"){
              throw new SyntaxError("Unrecognized Expression: "+selCall[1]);
            }
            return fn.call(
               _this,
               vars,curId,totalList
            );
            //*/
         };
   $.extend({
      expressions: add//function(name,fn){ }
   });
   return true;
}(jQuery));