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@@ -0,0 +1,93 @@
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+(function () {
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+
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+if (typeof window.Element === "undefined" || "classList" in document.documentElement) return;
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+
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+// adds indexOf to Array prototype for IE support
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+if (!Array.prototype.indexOf) {
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+ Array.prototype.indexOf = function(obj, start) {
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+ for (var i = (start || 0), j = this.length; i < j; i++) {
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+ if (this[i] === obj) { return i; }
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+ }
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+ return -1;
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+ }
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+}
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+
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+var prototype = Array.prototype,
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+ indexOf = prototype.indexOf,
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+ slice = prototype.slice,
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+ push = prototype.push,
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+ splice = prototype.splice,
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+ join = prototype.join;
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+
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+function DOMTokenList(el) {
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+ this._element = el;
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+ if (el.className != this._classCache) {
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+ this._classCache = el.className;
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+
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+ if (!this._classCache) return;
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+
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+ // The className needs to be trimmed and split on whitespace
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+ // to retrieve a list of classes.
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+ var classes = this._classCache.replace(/^\s+|\s+$/g,'').split(/\s+/),
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+ i;
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+ for (i = 0; i < classes.length; i++) {
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+ push.call(this, classes[i]);
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+ }
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+ }
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+};
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+
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+function setToClassName(el, classes) {
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+ el.className = classes.join(' ');
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+}
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+
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+DOMTokenList.prototype = {
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+ add: function(token) {
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+ if(this.contains(token)) return;
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+ push.call(this, token);
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+ setToClassName(this._element, slice.call(this, 0));
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+ },
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+ contains: function(token) {
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+ return indexOf.call(this, token) !== -1;
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+ },
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+ item: function(index) {
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+ return this[index] || null;
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+ },
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+ remove: function(token) {
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+ var i = indexOf.call(this, token);
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+ if (i === -1) {
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+ return;
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+ }
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+ splice.call(this, i, 1);
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+ setToClassName(this._element, slice.call(this, 0));
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+ },
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+ toString: function() {
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+ return join.call(this, ' ');
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+ },
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+ toggle: function(token) {
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+ if (!this.contains(token)) {
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+ this.add(token);
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+ } else {
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+ this.remove(token);
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+ }
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+
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+ return this.contains(token);
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+ }
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+};
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+
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+window.DOMTokenList = DOMTokenList;
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+
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+function defineElementGetter (obj, prop, getter) {
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+ if (Object.defineProperty) {
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+ Object.defineProperty(obj, prop,{
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+ get : getter
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+ })
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+ } else {
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+ obj.__defineGetter__(prop, getter);
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+ }
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+}
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+
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+defineElementGetter(Element.prototype, 'classList', function () {
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+ return new DOMTokenList(this);
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+});
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+
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+})();
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