Function createPositionalPseudo

2.0.3/Sizzle.js:421–437

* Returns a function to use in pseudos for positionals * @param {Function} fn

(fn)

         */

        function createPositionalPseudo(fn) {
            return markFunction(function(argument) {
                argument = +argument;
                return markFunction(function(seed, matches) {
                    var j,
                        matchIndexes = fn([], seed.length, argument),
                        i = matchIndexes.length;

                    // Match elements found at the specified indexes
                    while (i--) {
                        if (seed[(j = matchIndexes[i])]) {
                            seed[j] = !(matches[j] = seed[j]);
                        }
                    }
                });
            });
        }

        /**
         * Detect xml