// polyfills for random ie stuff

/* 
 * classList.js: Cross-browser full element.classList implementation.
 * 2014-07-23
 *
 * By Eli Grey, http://eligrey.com
 * Public Domain.
 * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
 */

/*global self, document, DOMException */

/*! @source http://purl.eligrey.com/github/classList.js/blob/master/classList.js*/

if ("document" in self) {

    // Full polyfill for browsers with no classList support
    if (!("classList" in document.createElement("_"))) {

        (function (view) {

            "use strict";

            if (!('Element' in view)) return;

            var
                classListProp = "classList"
              , protoProp = "prototype"
              , elemCtrProto = view.Element[protoProp]
              , objCtr = Object
              , strTrim = String[protoProp].trim || function () {
                  return this.replace(/^\s+|\s+$/g, "");
              }
              , arrIndexOf = Array[protoProp].indexOf || function (item) {
                  var
                      i = 0
                    , len = this.length
                  ;
                  for (; i < len; i++) {
                      if (i in this && this[i] === item) {
                          return i;
                      }
                  }
                  return -1;
              }
              // Vendors: please allow content code to instantiate DOMExceptions
              , DOMEx = function (type, message) {
                  this.name = type;
                  this.code = DOMException[type];
                  this.message = message;
              }
              , checkTokenAndGetIndex = function (classList, token) {
                  if (token === "") {
                      throw new DOMEx(
                          "SYNTAX_ERR"
                        , "An invalid or illegal string was specified"
                      );
                  }
                  if (/\s/.test(token)) {
                      throw new DOMEx(
                          "INVALID_CHARACTER_ERR"
                        , "String contains an invalid character"
                      );
                  }
                  return arrIndexOf.call(classList, token);
              }
              , ClassList = function (elem) {
                  var
                      trimmedClasses = strTrim.call(elem.getAttribute("class") || "")
                    , classes = trimmedClasses ? trimmedClasses.split(/\s+/) : []
                    , i = 0
                    , len = classes.length
                  ;
                  for (; i < len; i++) {
                      this.push(classes[i]);
                  }
                  this._updateClassName = function () {
                      elem.setAttribute("class", this.toString());
                  };
              }
              , classListProto = ClassList[protoProp] = []
              , classListGetter = function () {
                  return new ClassList(this);
              }
            ;
            // Most DOMException implementations don't allow calling DOMException's toString()
            // on non-DOMExceptions. Error's toString() is sufficient here.
            DOMEx[protoProp] = Error[protoProp];
            classListProto.item = function (i) {
                return this[i] || null;
            };
            classListProto.contains = function (token) {
                token += "";
                return checkTokenAndGetIndex(this, token) !== -1;
            };
            classListProto.add = function () {
                var
                    tokens = arguments
                  , i = 0
                  , l = tokens.length
                  , token
                  , updated = false
                ;
                do {
                    token = tokens[i] + "";
                    if (checkTokenAndGetIndex(this, token) === -1) {
                        this.push(token);
                        updated = true;
                    }
                }
                while (++i < l);

                if (updated) {
                    this._updateClassName();
                }
            };
            classListProto.remove = function () {
                var
                    tokens = arguments
                  , i = 0
                  , l = tokens.length
                  , token
                  , updated = false
                  , index
                ;
                do {
                    token = tokens[i] + "";
                    index = checkTokenAndGetIndex(this, token);
                    while (index !== -1) {
                        this.splice(index, 1);
                        updated = true;
                        index = checkTokenAndGetIndex(this, token);
                    }
                }
                while (++i < l);

                if (updated) {
                    this._updateClassName();
                }
            };
            classListProto.toggle = function (token, force) {
                token += "";

                var
                    result = this.contains(token)
                  , method = result ?
                    force !== true && "remove"
                  :
                    force !== false && "add"
                ;

                if (method) {
                    this[method](token);
                }

                if (force === true || force === false) {
                    return force;
                } else {
                    return !result;
                }
            };
            classListProto.toString = function () {
                return this.join(" ");
            };

            if (objCtr.defineProperty) {
                var classListPropDesc = {
                    get: classListGetter
                  , enumerable: true
                  , configurable: true
                };
                try {
                    objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
                } catch (ex) { // IE 8 doesn't support enumerable:true
                    if (ex.number === -0x7FF5EC54) {
                        classListPropDesc.enumerable = false;
                        objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
                    }
                }
            } else if (objCtr[protoProp].__defineGetter__) {
                elemCtrProto.__defineGetter__(classListProp, classListGetter);
            }

        }(self));

    } else {
        // There is full or partial native classList support, so just check if we need
        // to normalize the add/remove and toggle APIs.

        (function () {
            "use strict";

            var testElement = document.createElement("_");

            testElement.classList.add("c1", "c2");

            // Polyfill for IE 10/11 and Firefox <26, where classList.add and
            // classList.remove exist but support only one argument at a time.
            if (!testElement.classList.contains("c2")) {
                var createMethod = function (method) {
                    var original = DOMTokenList.prototype[method];

                    DOMTokenList.prototype[method] = function (token) {
                        var i, len = arguments.length;

                        for (i = 0; i < len; i++) {
                            token = arguments[i];
                            original.call(this, token);
                        }
                    };
                };
                createMethod('add');
                createMethod('remove');
            }

            testElement.classList.toggle("c3", false);

            // Polyfill for IE 10 and Firefox <24, where classList.toggle does not
            // support the second argument.
            if (testElement.classList.contains("c3")) {
                var _toggle = DOMTokenList.prototype.toggle;

                DOMTokenList.prototype.toggle = function (token, force) {
                    if (1 in arguments && !this.contains(token) === !force) {
                        return force;
                    } else {
                        return _toggle.call(this, token);
                    }
                };

            }

            testElement = null;
        }());

    }

}