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/*!
  
Copyright 2012, Dustin Diaz (the "Original Author")
All rights reserved.

MIT License

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions

 * classie - class helper functions
 * from bonzo https://github.com/ded/bonzo
 * 
 * classie.has( elem, 'my-class' ) -> true/false
 * classie.add( elem, 'my-new-class' )
 * classie.remove( elem, 'my-unwanted-class' )
 * classie.toggle( elem, 'my-class' )
 */
/*jshint browser: true, strict: true, undef: true */
/*global define: false */
(function (window) {
  'use strict';
  // class helper functions from bonzo https://github.com/ded/bonzo
  function classReg(className) {
    return new RegExp("(^|\\s+)" + className + "(\\s+|$)");
  }
  // classList support for class management
  // altho to be fair, the api sucks because it won't accept multiple classes at once
  var hasClass, addClass, removeClass;
  if ('classList' in document.documentElement) {
    hasClass = function (elem, c) {
      return elem.classList.contains(c);
    };
    addClass = function (elem, c) {
      elem.classList.add(c);
    };
    removeClass = function (elem, c) {
      elem.classList.remove(c);
    };
  }
  else {
    hasClass = function (elem, c) {
      return classReg(c).test(elem.className);
    };
    addClass = function (elem, c) {
      if (!hasClass(elem, c)) {
        elem.className = elem.className + ' ' + c;
      }
    };
    removeClass = function (elem, c) {
      elem.className = elem.className.replace(classReg(c), ' ');
    };
  }
  function toggleClass(elem, c) {
    var fn = hasClass(elem, c) ? removeClass : addClass;
    fn(elem, c);
  }
  var classie = {
    // full names
    hasClass: hasClass,
    addClass: addClass,
    removeClass: removeClass,
    toggleClass: toggleClass,
    // short names
    has: hasClass,
    add: addClass,
    remove: removeClass,
    toggle: toggleClass
  };
  // transport
  if (typeof define === 'function' && define.amd) {
    // AMD
    define(classie);
  } else {
    // browser global
    window.classie = classie;
  }
})(window);