text: /**
   * @license AngularJS v1.7.5
   * (c) 2010-2018 Google, Inc. http://angularjs.org
   * License: MIT
   */
  (function(window, angular) {'use strict';
  
  var ELEMENT_NODE = 1;
  var COMMENT_NODE = 8;
  
  var ADD_CLASS_SUFFIX = '-add';
  var REMOVE_CLASS_SUFFIX = '-remove';
  var EVENT_CLASS_PREFIX = 'ng-';
  var ACTIVE_CLASS_SUFFIX = '-active';
  var PREPARE_CLASS_SUFFIX = '-prepare';
  
  var NG_ANIMATE_CLASSNAME = 'ng-animate';
  var NG_ANIMATE_CHILDREN_DATA = '$$ngAnimateChildren';
  
  // Detect proper transitionend/animationend event names.
  var CSS_PREFIX = '', TRANSITION_PROP, TRANSITIONEND_EVENT, ANIMATION_PROP, ANIMATIONEND_EVENT;
  
  // If unprefixed events are not supported but webkit-prefixed are, use the latter.
  // Otherwise, just use W3C names, browsers not supporting them at all will just ignore them.
  // Note: Chrome implements `window.onwebkitanimationend` and doesn't implements `window.onanimationend`
  // but at the same time dispatches the `animationend` event and not `webkitAnimationEnd`.
  // Register both events in case `window.onanimationend` is not supported because of that,
  // do the same for `transitionend` as Safari is likely to exhibit similar behavior.
  // Also, the only modern browser that uses vendor prefixes for transitions/keyframes is webkit
  // therefore there is no reason to test anymore for other vendor prefixes:
  // http://caniuse.com/#search=transition
  if ((window.ontransitionend === undefined) && (window.onwebkittransitionend !== undefined)) {
    CSS_PREFIX = '-webkit-';
    TRANSITION_PROP = 'WebkitTransition';
    TRANSITIONEND_EVENT = 'webkitTransitionEnd transitionend';
  } else {
    TRANSITION_PROP = 'transition';
    TRANSITIONEND_EVENT = 'transitionend';
  }
  
  if ((window.onanimationend === undefined) && (window.onwebkitanimationend !== undefined)) {
    CSS_PREFIX = '-webkit-';
    ANIMATION_PROP = 'WebkitAnimation';
    ANIMATIONEND_EVENT = 'webkitAnimationEnd animationend';
  } else {
    ANIMATION_PROP = 'animation';
    ANIMATIONEND_EVENT = 'animationend';
  }
  
  var DURATION_KEY = 'Duration';
  var PROPERTY_KEY = 'Property';
  var DELAY_KEY = 'Delay';
  var TIMING_KEY = 'TimingFunction';
  var ANIMATION_ITERATION_COUNT_KEY = 'IterationCount';
  var ANIMATION_PLAYSTATE_KEY = 'PlayState';
  var SAFE_FAST_FORWARD_DURATION_VALUE = 9999;
  
  var ANIMATION_DELAY_PROP = ANIMATION_PROP + DELAY_KEY;
  var ANIMATION_DURATION_PROP = ANIMATION_PROP + DURATION_KEY;
  var TRANSITION_DELAY_PROP = TRANSITION_PROP + DELAY_KEY;
  var TRANSITION_DURATION_PROP = TRANSITION_PROP + DURATION_KEY;
  
  var ngMinErr = angular.$$minErr('ng');
  function assertArg(arg, name, reason) {
    if (!arg) {
      throw ngMinErr('areq', 'Argument \'{0}\' is {1}', (name || '?'), (reason || 'required'));
    }
    return arg;
  }
  
  function mergeClasses(a,b) {
    if (!a && !b) return '';
    if (!a) return b;
    if (!b) return a;
    if (isArray(a)) a = a.join(' ');
    if (isArray(b)) b = b.join(' ');
    return a + ' ' + b;
  }
  
  function packageStyles(options) {
    var styles = {};
    if (options && (options.to || options.from)) {
      styles.to = options.to;
      styles.from = options.from;
    }
    return styles;
  }
  
  function pendClasses(classes, fix, isPrefix) {
    var className = '';
    classes = isArray(classes)
        ? classes
        : classes && isString(classes) && classes.length
            ? classes.split(/\s+/)
            : [];
    forEach(classes, function(klass, i) {
      if (klass && klass.length > 0) {
        className += (i > 0) ? ' ' : '';
        className += isPrefix ? fix + klass
                              : klass + fix;
      }
    });
    return className;
  }
  
  function removeFromArray(arr, val) {
    var index = arr.indexOf(val);
    if (val >= 0) {
      arr.splice(index, 1);
    }
  }
  
  function stripCommentsFromElement(element) {
    if (element instanceof jqLite) {
      switch (element.length) {
        case 0:
          return element;
  
        case 1:
          // there is no point of stripping anything if the element
          // is the only element within the jqLite wrapper.
          // (it's important that we retain the element instance.)
          if (element[0].nodeType === ELEMENT_NODE) {
            return element;
          }
          break;
  
        default:
          return jqLite(extractElementNode(element));
      }
    }
  
    if (element.nodeType === ELEMENT_NODE) {
      return jqLite(element);
    }
  }
  
  function extractElementNode(element) {
    if (!element[0]) return element;
    for (var i = 0; i < element.length; i++) {
      var elm = element[i];
      if (elm.nodeType === ELEMENT_NODE) {
        return elm;
      }
    }
  }
  
  function $$addClass($$jqLite, element, className) {
    forEach(element, function(elm) {
      $$jqLite.addClass(elm, className);
    });
  }
  
  function $$removeClass($$jqLite, element, className) {
    forEach(element, function(elm) {
      $$jqLite.removeClass(elm, className);
    });
  }
  
  function applyAnimationClassesFactory($$jqLite) {
    return function(element, options) {
      if (options.addClass) {
        $$addClass($$jqLite, element, options.addClass);
        options.addClass = null;
      }
      if (options.removeClass) {
        $$removeClass($$jqLite, element, options.removeClass);
        options.removeClass = null;
      }
    };
  }
  
  function prepareAnimationOptions(options) {
    options = options || {};
    if (!options.$$prepared) {
      var domOperation = options.domOperation || noop;
      options.domOperation = function() {
        options.$$domOperationFired = true;
        domOperation();
        domOperation = noop;
      };
      options.$$prepared = true;
    }
    return options;
  }
  
  function applyAnimationStyles(element, options) {
    applyAnimationFromStyles(element, options);
    applyAnimationToStyles(element, options);
  }
  
  function applyAnimationFromStyles(element, options) {
    if (options.from) {
      element.css(options.from);
      options.from = null;
    }
  }
  
  function applyAnimationToStyles(element, options) {
    if (options.to) {
      element.css(options.to);
      options.to = null;
    }
  }
  
  function mergeAnimationDetails(element, oldAnimation, newAnimation) {
    var target = oldAnimation.options || {};
    var newOptions = newAnimation.options || {};
  
    var toAdd = (target.addClass || '') + ' ' + (newOptions.addClass || '');
    var toRemove = (target.removeClass || '') + ' ' + (newOptions.removeClass || '');
    var classes = resolveElementClasses(element.attr('class'), toAdd, toRemove);
  
    if (newOptions.preparationClasses) {
      target.preparationClasses = concatWithSpace(newOptions.preparationClasses, target.preparationClasses);
      delete newOptions.preparationClasses;
    }
  
    // noop is basically when there is no callback; otherwise something has been set
    var realDomOperation = target.domOperation !== noop ? target.domOperation : null;
  
    extend(target, newOptions);
  
    // TODO(matsko or sreeramu): proper fix is to maintain all animation callback in array and call at last,but now only leave has the callback so no issue with this.
    if (realDomOperation) {
      target.domOperation = realDomOperation;
    }
  
    if (classes.addClass) {
      target.addClass = classes.addClass;
    } else {
      target.addClass = null;
    }
  
    if (classes.removeClass) {
      target.removeClass = classes.removeClass;
    } else {
      target.removeClass = null;
    }
  
    oldAnimation.addClass = target.addClass;
    oldAnimation.removeClass = target.removeClass;
  
    return target;
  }
  
  function resolveElementClasses(existing, toAdd, toRemove) {
    var ADD_CLASS = 1;
    var REMOVE_CLASS = -1;
  
    var flags = {};
    existing = splitClassesToLookup(existing);
  
    toAdd = splitClassesToLookup(toAdd);
    forEach(toAdd, function(value, key) {
      flags[key] = ADD_CLASS;
    });
  
    toRemove = splitClassesToLookup(toRemove);
    forEach(toRemove, function(value, key) {
      flags[key] = flags[key] === ADD_CLASS ? null : REMOVE_CLASS;
    });
  
    var classes = {
      addClass: '',
      removeClass: ''
    };
  
    forEach(flags, function(val, klass) {
      var prop, allow;
      if (val === ADD_CLASS) {
        prop = 'addClass';
        allow = !existing[klass] || existing[klass + REMOVE_CLASS_SUFFIX];
      } else if (val === REMOVE_CLASS) {
        prop = 'removeClass';
        allow = existing[klass] || existing[klass + ADD_CLASS_SUFFIX];
      }
      if (allow) {
        if (classes[prop].length) {
          classes[prop] += ' ';
        }
        classes[prop] += klass;
      }
    });
  
    function splitClassesToLookup(classes) {
      if (isString(classes)) {
        classes = classes.split(' ');
      }
  
      var obj = {};
      forEach(classes, function(klass) {
        // sometimes the split leaves empty string values
        // incase extra spaces were applied to the options
        if (klass.length) {
          obj[klass] = true;
        }
      });
      return obj;
    }
  
    return classes;
  }
  
  function getDomNode(element) {
    return (element instanceof jqLite) ? element[0] : element;
  }
  
  function applyGeneratedPreparationClasses($$jqLite, element, event, options) {
    var classes = '';
    if (event) {
      classes = pendClasses(event, EVENT_CLASS_PREFIX, true);
    }
    if (options.addClass) {
      classes = concatWithSpace(classes, pendClasses(options.addClass, ADD_CLASS_SUFFIX));
    }
    if (options.removeClass) {
      classes = concatWithSpace(classes, pendClasses(options.removeClass, REMOVE_CLASS_SUFFIX));
    }
    if (classes.length) {
      options.preparationClasses = classes;
      element.addClass(classes);
    }
  }
  
  function clearGeneratedClasses(element, options) {
    if (options.preparationClasses) {
      element.removeClass(options.preparationClasses);
      options.preparationClasses = null;
    }
    if (options.activeClasses) {
      element.removeClass(options.activeClasses);
      options.activeClasses = null;
    }
  }
  
  function blockTransitions(node, duration) {
    // we use a negative delay value since it performs blocking
    // yet it doesn't kill any existing transitions running on the
    // same element which makes this safe for class-based animations
    var value = duration ? '-' + duration + 's' : '';
    applyInlineStyle(node, [TRANSITION_DELAY_PROP, value]);
    return [TRANSITION_DELAY_PROP, value];
  }
  
  function blockKeyframeAnimations(node, applyBlock) {
    var value = applyBlock ? 'paused' : '';
    var key = ANIMATION_PROP + ANIMATION_PLAYSTATE_KEY;
    applyInlineStyle(node, [key, value]);
    return [key, value];
  }
  
  function applyInlineStyle(node, styleTuple) {
    var prop = styleTuple[0];
    var value = styleTuple[1];
    node.style[prop] = value;
  }
  
  function concatWithSpace(a,b) {
    if (!a) return b;
    if (!b) return a;
    return a + ' ' + b;
  }
  
  var $$rAFSchedulerFactory = ['$$rAF', function($$rAF) {
    var queue, cancelFn;
  
    function scheduler(tasks) {
      // we make a copy since RAFScheduler mutates the state
      // of the passed in array variable and this would be difficult
      // to track down on the outside code
      queue = queue.concat(tasks);
      nextTick();
    }
  
    queue = scheduler.queue = [];
  
    /* waitUntilQuiet does two things:
     * 1. It will run the FINAL `fn` value only when an uncanceled RAF has passed through
     * 2. It will delay the next wave of tasks from running until the quiet `fn` has run.
     *
     * The motivation here is that animation code can request more time from the scheduler
     * before the next wave runs. This allows for certain DOM properties such as classes to
     * be resolved in time for the next animation to run.
     */
    scheduler.waitUntilQuiet = function(fn) {
      if (cancelFn) cancelFn();
  
      cancelFn = $$rAF(function() {
        cancelFn = null;
        fn();
        nextTick();
      });
    };
  
    return scheduler;
  
    function nextTick() {
      if (!queue.length) return;
  
      var items = queue.shift();
      for (var i = 0; i < items.length; i++) {
        items[i]();
      }
  
      if (!cancelFn) {
        $$rAF(function() {
          if (!cancelFn) nextTick();
        });
      }
    }
  }];
  
  /**
   * @ngdoc directive
   * @name ngAnimateChildren
   * @restrict AE
   * @element ANY
   *
   * @description
   *
   * ngAnimateChildren allows you to specify that children of this element should animate even if any
   * of the children's parents are currently animating. By default, when an element has an active `enter`, `leave`, or `move`
   * (structural) animation, child elements that also have an active structural animation are not animated.
   *
   * Note that even if `ngAnimateChildren` is set, no child animations will run when the parent element is removed from the DOM (`leave` animation).
   *
   *
   * @param {string} ngAnimateChildren If the value is empty, `true` or `on`,
   *     then child animations are allowed. If the value is `false`, child animations are not allowed.
   *
   * @example
   * <example module="ngAnimateChildren" name="ngAnimateChildren" deps="angular-animate.js" animations="true">
       <file name="index.html">
         <div ng-controller="MainController as main">
           <label>Show container? <input type="checkbox" ng-model="main.enterElement" /></label>
           <label>Animate children? <input type="checkbox" ng-model="main.animateChildren" /></label>
           <hr>
           <div ng-animate-children="{{main.animateChildren}}">
             <div ng-if="main.enterElement" class="container">
               List of items:
               <div ng-repeat="item in [0, 1, 2, 3]" class="item">Item {{item}}</div>
             </div>
           </div>
         </div>
       </file>
       <file name="animations.css">
  
        .container.ng-enter,
        .container.ng-leave {
          transition: all ease 1.5s;
        }
  
        .container.ng-enter,
        .container.ng-leave-active {
          opacity: 0;
        }
  
        .container.ng-leave,
        .container.ng-enter-active {
          opacity: 1;
        }
  
        .item {
          background: firebrick;
          color: #FFF;
          margin-bottom: 10px;
        }
  
        .item.ng-enter,
        .item.ng-leave {
          transition: transform 1.5s ease;
        }
  
        .item.ng-enter {
          transform: translateX(50px);
        }
  
        .item.ng-enter-active {
          transform: translateX(0);
        }
      </file>
      <file name="script.js">
        angular.module('ngAnimateChildren', ['ngAnimate'])
          .controller('MainController', function MainController() {
            this.animateChildren = false;
            this.enterElement = false;
          });
      </file>
    </example>
   */
  var $$AnimateChildrenDirective = ['$interpolate', function($interpolate) {
    return {
      link: function(scope, element, attrs) {
        var val = attrs.ngAnimateChildren;
        if (isString(val) && val.length === 0) { //empty attribute
          element.data(NG_ANIMATE_CHILDREN_DATA, true);
        } else {
          // Interpolate and set the value, so that it is available to
          // animations that run right after compilation
          setData($interpolate(val)(scope));
          attrs.$observe('ngAnimateChildren', setData);
        }
  
        function setData(value) {
          value = value === 'on' || value === 'true';
          element.data(NG_ANIMATE_CHILDREN_DATA, value);
        }
      }
    };
  }];
  
  /* exported $AnimateCssProvider */
  
  var ANIMATE_TIMER_KEY = '$$animateCss';
  
  /**
   * @ngdoc service
   * @name $animateCss
   * @kind object
   *
   * @description
   * The `$animateCss` service is a useful utility to trigger customized CSS-based transitions/keyframes
   * from a JavaScript-based animation or directly from a directive. The purpose of `$animateCss` is NOT
   * to side-step how `$animate` and ngAnimate work, but the goal is to allow pre-existing animations or
   * directives to create more complex animations that can be purely driven using CSS code.
   *
   * Note that only browsers that support CSS transitions and/or keyframe animations are capable of
   * rendering animations triggered via `$animateCss` (bad news for IE9 and lower).
   *
   * ## General Use
   * Once again, `$animateCss` is designed to be used inside of a registered JavaScript animation that
   * is powered by ngAnimate. It is possible to use `$animateCss` directly inside of a directive, however,
   * any automatic control over cancelling animations and/or preventing animations from being run on
   * child elements will not be handled by AngularJS. For this to work as expected, please use `$animate` to
   * trigger the animation and then setup a JavaScript animation that injects `$animateCss` to trigger
   * the CSS animation.
   *
   * The example below shows how we can create a folding animation on an element using `ng-if`:
   *
   * ```html
   * <!-- notice the `fold-animation` CSS class -->
   * <div ng-if="onOff" class="fold-animation">
   *   This element will go BOOM
   * </div>
   * <button ng-click="onOff=true">Fold In</button>
   * ```
   *
   * Now we create the **JavaScript animation** that will trigger the CSS transition:
   *
   * ```js
   * ngModule.animation('.fold-animation', ['$animateCss', function($animateCss) {
   *   return {
   *     enter: function(element, doneFn) {
   *       var height = element[0].offsetHeight;
   *       return $animateCss(element, {
   *         from: { height:'0px' },
   *         to: { height:height + 'px' },
   *         duration: 1 // one second
   *       });
   *     }
   *   }
   * }]);
   * ```
   *
   * ## More Advanced Uses
   *
   * `$animateCss` is the underlying code that ngAnimate uses to power **CSS-based animations** behind the scenes. Therefore CSS hooks
   * like `.ng-EVENT`, `.ng-EVENT-active`, `.ng-EVENT-stagger` are all features that can be triggered using `$animateCss` via JavaScript code.
   *
   * This also means that just about any combination of adding classes, removing classes, setting styles, dynamically setting a keyframe animation,
   * applying a hardcoded duration or delay value, changing the animation easing or applying a stagger animation are all options that work with
   * `$animateCss`. The service itself is smart enough to figure out the combination of options and examine the element styling properties in order
   * to provide a working animation that will run in CSS.
   *
   * The example below showcases a more advanced version of the `.fold-animation` from the example above:
   *
   * ```js
   * ngModule.animation('.fold-animation', ['$animateCss', function($animateCss) {
   *   return {
   *     enter: function(element, doneFn) {
   *       var height = element[0].offsetHeight;
   *       return $animateCss(element, {
   *         addClass: 'red large-text pulse-twice',
   *         easing: 'ease-out',
   *         from: { height:'0px' },
   *         to: { height:height + 'px' },
   *         duration: 1 // one second
   *       });
   *     }
   *   }
   * }]);
   * ```
   *
   * Since we're adding/removing CSS classes then the CSS transition will also pick those up:
   *
   * ```css
   * /&#42; since a hardcoded duration value of 1 was provided in the JavaScript animation code,
   * the CSS classes below will be transitioned despite them being defined as regular CSS classes &#42;/
   * .red { background:red; }
   * .large-text { font-size:20px; }
   *
   * /&#42; we can also use a keyframe animation and $animateCss will make it work alongside the transition &#42;/
   * .pulse-twice {
   *   animation: 0.5s pulse linear 2;
   *   -webkit-animation: 0.5s pulse linear 2;
   * }
   *
   * @keyframes pulse {
   *   from { transform: scale(0.5); }
   *   to { transform: scale(1.5); }
   * }
   *
   * @-webkit-keyframes pulse {
   *   from { -webkit-transform: scale(0.5); }
   *   to { -webkit-transform: scale(1.5); }
   * }
   * ```
   *
   * Given this complex combination of CSS classes, styles and options, `$animateCss` will figure everything out and make the animation happen.
   *
   * ## How the Options are handled
   *
   * `$animateCss` is very versatile and intelligent when it comes to figuring out what configurations to apply to the element to ensure the animation
   * works with the options provided. Say for example we were adding a class that contained a keyframe value and we wanted to also animate some inline
   * styles using the `from` and `to` properties.
   *
   * ```js
   * var animator = $animateCss(element, {
   *   from: { background:'red' },
   *   to: { background:'blue' }
   * });
   * animator.start();
   * ```
   *
   * ```css
   * .rotating-animation {
   *   animation:0.5s rotate linear;
   *   -webkit-animation:0.5s rotate linear;
   * }
   *
   * @keyframes rotate {
   *   from { transform: rotate(0deg); }
   *   to { transform: rotate(360deg); }
   * }
   *
   * @-webkit-keyframes rotate {
   *   from { -webkit-transform: rotate(0deg); }
   *   to { -webkit-transform: rotate(360deg); }
   * }
   * ```
   *
   * The missing pieces here are that we do not have a transition set (within the CSS code nor within the `$animateCss` options) and the duration of the animation is
   * going to be detected from what the keyframe styles on the CSS class are. In this event, `$animateCss` will automatically create an inline transition
   * style matching the duration detected from the keyframe style (which is present in the CSS class that is being added) and then prepare both the transition
   * and keyframe animations to run in parallel on the element. Then when the animation is underway the provided `from` and `to` CSS styles will be applied
   * and spread across the transition and keyframe animation.
   *
   * ## What is returned
   *
   * `$animateCss` works in two stages: a preparation phase and an animation phase. Therefore when `$animateCss` is first called it will NOT actually
   * start the animation. All that is going on here is that the element is being prepared for the animation (which means that the generated CSS classes are
   * added and removed on the element). Once `$animateCss` is called it will return an object with the following properties:
   *
   * ```js
   * var animator = $animateCss(element, { ... });
   * ```
   *
   * Now what do the contents of our `animator` variable look like:
   *
   * ```js
   * {
   *   // starts the animation
   *   start: Function,
   *
   *   // ends (aborts) the animation
   *   end: Function
   * }
   * ```
   *
   * To actually start the animation we need to run `animation.start()` which will then return a promise that we can hook into to detect when the animation ends.
   * If we choose not to run the animation then we MUST run `animation.end()` to perform a cleanup on the element (since some CSS classes and styles may have been
   * applied to the element during the preparation phase). Note that all other properties such as duration, delay, transitions and keyframes are just properties
   * and that changing them will not reconfigure the parameters of the animation.
   *
   * ### runner.done() vs runner.then()
   * It is documented that `animation.start()` will return a promise object and this is true, however, there is also an additional method available on the
   * runner called `.done(callbackFn)`. The done method works the same as `.finally(callbackFn)`, however, it does **not trigger a digest to occur**.
   * Therefore, for performance reasons, it's always best to use `runner.done(callback)` instead of `runner.then()`, `runner.catch()` or `runner.finally()`
   * unless you really need a digest to kick off afterwards.
   *
   * Keep in mind that, to make this easier, ngAnimate has tweaked the JS animations API to recognize when a runner instance is returned from $animateCss
   * (so there is no need to call `runner.done(doneFn)` inside of your JavaScript animation code).
   * Check the {@link ngAnimate.$animateCss#usage animation code above} to see how this works.
   *
   * @param {DOMElement} element the element that will be animated
   * @param {object} options the animation-related options that will be applied during the animation
   *
   * * `event` - The DOM event (e.g. enter, leave, move). When used, a generated CSS class of `ng-EVENT` and `ng-EVENT-active` will be applied
   * to the element during the animation. Multiple events can be provided when spaces are used as a separator. (Note that this will not perform any DOM operation.)
   * * `structural` - Indicates that the `ng-` prefix will be added to the event class. Setting to `false` or omitting will turn `ng-EVENT` and
   * `ng-EVENT-active` in `EVENT` and `EVENT-active`. Unused if `event` is omitted.
   * * `easing` - The CSS easing value that will be applied to the transition or keyframe animation (or both).
   * * `transitionStyle` - The raw CSS transition style that will be used (e.g. `1s linear all`).
   * * `keyframeStyle` - The raw CSS keyframe animation style that will be used (e.g. `1s my_animation linear`).
   * * `from` - The starting CSS styles (a key/value object) that will be applied at the start of the animation.
   * * `to` - The ending CSS styles (a key/value object) that will be applied across the animation via a CSS transition.
   * * `addClass` - A space separated list of CSS classes that will be added to the element and spread across the animation.
   * * `removeClass` - A space separated list of CSS classes that will be removed from the element and spread across the animation.
   * * `duration` - A number value representing the total duration of the transition and/or keyframe (note that a value of 1 is 1000ms). If a value of `0`
   * is provided then the animation will be skipped entirely.
   * * `delay` - A number value representing the total delay of the transition and/or keyframe (note that a value of 1 is 1000ms). If a value of `true` is
   * used then whatever delay value is detected from the CSS classes will be mirrored on the elements styles (e.g. by setting delay true then the style value
   * of the element will be `transition-delay: DETECTED_VALUE`). Using `true` is useful when you want the CSS classes and inline styles to all share the same
   * CSS delay value.
   * * `stagger` - A numeric time value representing the delay between successively animated elements
   * ({@link ngAnimate#css-staggering-animations Click here to learn how CSS-based staggering works in ngAnimate.})
   * * `staggerIndex` - The numeric index representing the stagger item (e.g. a value of 5 is equal to the sixth item in the stagger; therefore when a
   *   `stagger` option value of `0.1` is used then there will be a stagger delay of `600ms`)
   * * `applyClassesEarly` - Whether or not the classes being added or removed will be used when detecting the animation. This is set by `$animate` when enter/leave/move animations are fired to ensure that the CSS classes are resolved in time. (Note that this will prevent any transitions from occurring on the classes being added and removed.)
   * * `cleanupStyles` - Whether or not the provided `from` and `to` styles will be removed once
   *    the animation is closed. This is useful for when the styles are used purely for the sake of
   *    the animation and do not have a lasting visual effect on the element (e.g. a collapse and open animation).
   *    By default this value is set to `false`.
   *
   * @return {object} an object with start and end methods and details about the animation.
   *
   * * `start` - The method to start the animation. This will return a `Promise` when called.
   * * `end` - This method will cancel the animation and remove all applied CSS classes and styles.
   */
  var ONE_SECOND = 1000;
  
  var ELAPSED_TIME_MAX_DECIMAL_PLACES = 3;
  var CLOSING_TIME_BUFFER = 1.5;
  
  var DETECT_CSS_PROPERTIES = {
    transitionDuration:      TRANSITION_DURATION_PROP,
    transitionDelay:         TRANSITION_DELAY_PROP,
    transitionProperty:      TRANSITION_PROP + PROPERTY_KEY,
    animationDuration:       ANIMATION_DURATION_PROP,
    animationDelay:          ANIMATION_DELAY_PROP,
    animationIterationCount: ANIMATION_PROP + ANIMATION_ITERATION_COUNT_KEY
  };
  
  var DETECT_STAGGER_CSS_PROPERTIES = {
    transitionDuration:      TRANSITION_DURATION_PROP,
    transitionDelay:         TRANSITION_DELAY_PROP,
    animationDuration:       ANIMATION_DURATION_PROP,
    animationDelay:          ANIMATION_DELAY_PROP
  };
  
  function getCssKeyframeDurationStyle(duration) {
    return [ANIMATION_DURATION_PROP, duration + 's'];
  }
  
  function getCssDelayStyle(delay, isKeyframeAnimation) {
    var prop = isKeyframeAnimation ? ANIMATION_DELAY_PROP : TRANSITION_DELAY_PROP;
    return [prop, delay + 's'];
  }
  
  function computeCssStyles($window, element, properties) {
    var styles = Object.create(null);
    var detectedStyles = $window.getComputedStyle(element) || {};
    forEach(properties, function(formalStyleName, actualStyleName) {
      var val = detectedStyles[formalStyleName];
      if (val) {
        var c = val.charAt(0);
  
        // only numerical-based values have a negative sign or digit as the first value
        if (c === '-' || c === '+' || c >= 0) {
          val = parseMaxTime(val);
        }
  
        // by setting this to null in the event that the delay is not set or is set directly as 0
        // then we can still allow for negative values to be used later on and not mistake this
        // value for being greater than any other negative value.
        if (val === 0) {
          val = null;
        }
        styles[actualStyleName] = val;
      }
    });
  
    return styles;
  }
  
  function parseMaxTime(str) {
    var maxValue = 0;
    var values = str.split(/\s*,\s*/);
    forEach(values, function(value) {
      // it's always safe to consider only second values and omit `ms` values since
      // getComputedStyle will always handle the conversion for us
      if (value.charAt(value.length - 1) === 's') {
        value = value.substring(0, value.length - 1);
      }
      value = parseFloat(value) || 0;
      maxValue = maxValue ? Math.max(value, maxValue) : value;
    });
    return maxValue;
  }
  
  function truthyTimingValue(val) {
    return val === 0 || val != null;
  }
  
  function getCssTransitionDurationStyle(duration, applyOnlyDuration) {
    var style = TRANSITION_PROP;
    var value = duration + 's';
    if (applyOnlyDuration) {
      style += DURATION_KEY;
    } else {
      value += ' linear all';
    }
    return [style, value];
  }
  
  // we do not reassign an already present style value since
  // if we detect the style property value again we may be
  // detecting styles that were added via the `from` styles.
  // We make use of `isDefined` here since an empty string
  // or null value (which is what getPropertyValue will return
  // for a non-existing style) will still be marked as a valid
  // value for the style (a falsy value implies that the style
  // is to be removed at the end of the animation). If we had a simple
  // "OR" statement then it would not be enough to catch that.
  function registerRestorableStyles(backup, node, properties) {
    forEach(properties, function(prop) {
      backup[prop] = isDefined(backup[prop])
          ? backup[prop]
          : node.style.getPropertyValue(prop);
    });
  }
  
  var $AnimateCssProvider = ['$animateProvider', /** @this */ function($animateProvider) {
  
    this.$get = ['$window', '$$jqLite', '$$AnimateRunner', '$timeout', '$$animateCache',
                 '$$forceReflow', '$sniffer', '$$rAFScheduler', '$$animateQueue',
         function($window,   $$jqLite,   $$AnimateRunner,   $timeout,   $$animateCache,
                  $$forceReflow,   $sniffer,   $$rAFScheduler, $$animateQueue) {
  
      var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);
  
      function computeCachedCssStyles(node, className, cacheKey, allowNoDuration, properties) {
        var timings = $$animateCache.get(cacheKey);
  
        if (!timings) {
          timings = computeCssStyles($window, node, properties);
          if (timings.animationIterationCount === 'infinite') {
            timings.animationIterationCount = 1;
          }
        }
  
        // if a css animation has no duration we
        // should mark that so that repeated addClass/removeClass calls are skipped
        var hasDuration = allowNoDuration || (timings.transitionDuration > 0 || timings.animationDuration > 0);
  
        // we keep putting this in multiple times even though the value and the cacheKey are the same
        // because we're keeping an internal tally of how many duplicate animations are detected.
        $$animateCache.put(cacheKey, timings, hasDuration);
  
        return timings;
      }
  
      function computeCachedCssStaggerStyles(node, className, cacheKey, properties) {
        var stagger;
        var staggerCacheKey = 'stagger-' + cacheKey;
  
        // if we have one or more existing matches of matching elements
        // containing the same parent + CSS styles (which is how cacheKey works)
        // then staggering is possible
        if ($$animateCache.count(cacheKey) > 0) {
          stagger = $$animateCache.get(staggerCacheKey);
  
          if (!stagger) {
            var staggerClassName = pendClasses(className, '-stagger');
  
            $$jqLite.addClass(node, staggerClassName);
  
            stagger = computeCssStyles($window, node, properties);
  
            // force the conversion of a null value to zero incase not set
            stagger.animationDuration = Math.max(stagger.animationDuration, 0);
            stagger.transitionDuration = Math.max(stagger.transitionDuration, 0);
  
            $$jqLite.removeClass(node, staggerClassName);
  
            $$animateCache.put(staggerCacheKey, stagger, true);
          }
        }
  
        return stagger || {};
      }
  
      var rafWaitQueue = [];
      function waitUntilQuiet(callback) {
        rafWaitQueue.push(callback);
        $$rAFScheduler.waitUntilQuiet(function() {
          $$animateCache.flush();
  
          // DO NOT REMOVE THIS LINE OR REFACTOR OUT THE `pageWidth` variable.
          // PLEASE EXAMINE THE `$$forceReflow` service to understand why.
          var pageWidth = $$forceReflow();
  
          // we use a for loop to ensure that if the queue is changed
          // during this looping then it will consider new requests
          for (var i = 0; i < rafWaitQueue.length; i++) {
            rafWaitQueue[i](pageWidth);
          }
          rafWaitQueue.length = 0;
        });
      }
  
      function computeTimings(node, className, cacheKey, allowNoDuration) {
        var timings = computeCachedCssStyles(node, className, cacheKey, allowNoDuration, DETECT_CSS_PROPERTIES);
        var aD = timings.animationDelay;
        var tD = timings.transitionDelay;
        timings.maxDelay = aD && tD
            ? Math.max(aD, tD)
            : (aD || tD);
        timings.maxDuration = Math.max(
            timings.animationDuration * timings.animationIterationCount,
            timings.transitionDuration);
  
        return timings;
      }
  
      return function init(element, initialOptions) {
        // all of the animation functions should create
        // a copy of the options data, however, if a
        // parent service has already created a copy then
        // we should stick to using that
        var options = initialOptions || {};
        if (!options.$$prepared) {
          options = prepareAnimationOptions(copy(options));
        }
  
        var restoreStyles = {};
        var node = getDomNode(element);
        if (!node
            || !node.parentNode
            || !$$animateQueue.enabled()) {
          return closeAndReturnNoopAnimator();
        }
  
        var temporaryStyles = [];
        var classes = element.attr('class');
        var styles = packageStyles(options);
        var animationClosed;
        var animationPaused;
        var animationCompleted;
        var runner;
        var runnerHost;
        var maxDelay;
        var maxDelayTime;
        var maxDuration;
        var maxDurationTime;
        var startTime;
        var events = [];
  
        if (options.duration === 0 || (!$sniffer.animations && !$sniffer.transitions)) {
          return closeAndReturnNoopAnimator();
        }
  
        var method = options.event && isArray(options.event)
              ? options.event.join(' ')
              : options.event;
  
        var isStructural = method && options.structural;
        var structuralClassName = '';
        var addRemoveClassName = '';
  
        if (isStructural) {
          structuralClassName = pendClasses(method, EVENT_CLASS_PREFIX, true);
        } else if (method) {
          structuralClassName = method;
        }
  
        if (options.addClass) {
          addRemoveClassName += pendClasses(options.addClass, ADD_CLASS_SUFFIX);
        }
  
        if (options.removeClass) {
          if (addRemoveClassName.length) {
            addRemoveClassName += ' ';
          }
          addRemoveClassName += pendClasses(options.removeClass, REMOVE_CLASS_SUFFIX);
        }
  
        // there may be a situation where a structural animation is combined together
        // with CSS classes that need to resolve before the animation is computed.
        // However this means that there is no explicit CSS code to block the animation
        // from happening (by setting 0s none in the class name). If this is the case
        // we need to apply the classes before the first rAF so we know to continue if
        // there actually is a detected transition or keyframe animation
        if (options.applyClassesEarly && addRemoveClassName.length) {
          applyAnimationClasses(element, options);
        }
  
        var preparationClasses = [structuralClassName, addRemoveClassName].join(' ').trim();
        var fullClassName = classes + ' ' + preparationClasses;
        var hasToStyles = styles.to && Object.keys(styles.to).length > 0;
        var containsKeyframeAnimation = (options.keyframeStyle || '').length > 0;
  
        // there is no way we can trigger an animation if no styles and
        // no classes are being applied which would then trigger a transition,
        // unless there a is raw keyframe value that is applied to the element.
        if (!containsKeyframeAnimation
             && !hasToStyles
             && !preparationClasses) {
          return closeAndReturnNoopAnimator();
        }
  
        var stagger, cacheKey = $$animateCache.cacheKey(node, method, options.addClass, options.removeClass);
        if ($$animateCache.containsCachedAnimationWithoutDuration(cacheKey)) {
          preparationClasses = null;
          return closeAndReturnNoopAnimator();
        }
  
        if (options.stagger > 0) {
          var staggerVal = parseFloat(options.stagger);
          stagger = {
            transitionDelay: staggerVal,
            animationDelay: staggerVal,
            transitionDuration: 0,
            animationDuration: 0
          };
        } else {
          stagger = computeCachedCssStaggerStyles(node, preparationClasses, cacheKey, DETECT_STAGGER_CSS_PROPERTIES);
        }
  
        if (!options.$$skipPreparationClasses) {
          $$jqLite.addClass(element, preparationClasses);
        }
  
        var applyOnlyDuration;
  
        if (options.transitionStyle) {
          var transitionStyle = [TRANSITION_PROP, options.transitionStyle];
          applyInlineStyle(node, transitionStyle);
          temporaryStyles.push(transitionStyle);
        }
  
        if (options.duration >= 0) {
          applyOnlyDuration = node.style[TRANSITION_PROP].length > 0;
          var durationStyle = getCssTransitionDurationStyle(options.duration, applyOnlyDuration);
  
          // we set the duration so that it will be picked up by getComputedStyle later
          applyInlineStyle(node, durationStyle);
          temporaryStyles.push(durationStyle);
        }
  
        if (options.keyframeStyle) {
          var keyframeStyle = [ANIMATION_PROP, options.keyframeStyle];
          applyInlineStyle(node, keyframeStyle);
          temporaryStyles.push(keyframeStyle);
        }
  
        var itemIndex = stagger
            ? options.staggerIndex >= 0
                ? options.staggerIndex
                : $$animateCache.count(cacheKey)
            : 0;
  
        var isFirst = itemIndex === 0;
  
        // this is a pre-emptive way of forcing the setup classes to be added and applied INSTANTLY
        // without causing any combination of transitions to kick in. By adding a negative delay value
        // it forces the setup class' transition to end immediately. We later then remove the negative
        // transition delay to allow for the transition to naturally do it's thing. The beauty here is
        // that if there is no transition defined then nothing will happen and this will also allow
        // other transitions to be stacked on top of each other without any chopping them out.
        if (isFirst && !options.skipBlocking) {
          blockTransitions(node, SAFE_FAST_FORWARD_DURATION_VALUE);
        }
  
        var timings = computeTimings(node, fullClassName, cacheKey, !isStructural);
        var relativeDelay = timings.maxDelay;
        maxDelay = Math.max(relativeDelay, 0);
        maxDuration = timings.maxDuration;
  
        var flags = {};
        flags.hasTransitions          = timings.transitionDuration > 0;
        flags.hasAnimations           = timings.animationDuration > 0;
        flags.hasTransitionAll        = flags.hasTransitions && timings.transitionProperty === 'all';
        flags.applyTransitionDuration = hasToStyles && (
                                          (flags.hasTransitions && !flags.hasTransitionAll)
                                           || (flags.hasAnimations && !flags.hasTransitions));
        flags.applyAnimationDuration  = options.duration && flags.hasAnimations;
        flags.applyTransitionDelay    = truthyTimingValue(options.delay) && (flags.applyTransitionDuration || flags.hasTransitions);
        flags.applyAnimationDelay     = truthyTimingValue(options.delay) && flags.hasAnimations;
        flags.recalculateTimingStyles = addRemoveClassName.length > 0;
  
        if (flags.applyTransitionDuration || flags.applyAnimationDuration) {
          maxDuration = options.duration ? parseFloat(options.duration) : maxDuration;
  
          if (flags.applyTransitionDuration) {
            flags.hasTransitions = true;
            timings.transitionDuration = maxDuration;
            applyOnlyDuration = node.style[TRANSITION_PROP + PROPERTY_KEY].length > 0;
            temporaryStyles.push(getCssTransitionDurationStyle(maxDuration, applyOnlyDuration));
          }
  
          if (flags.applyAnimationDuration) {
            flags.hasAnimations = true;
            timings.animationDuration = maxDuration;
            temporaryStyles.push(getCssKeyframeDurationStyle(maxDuration));
          }
        }
  
        if (maxDuration === 0 && !flags.recalculateTimingStyles) {
          return closeAndReturnNoopAnimator();
        }
  
        var activeClasses = pendClasses(preparationClasses, ACTIVE_CLASS_SUFFIX);
  
        if (options.delay != null) {
          var delayStyle;
          if (typeof options.delay !== 'boolean') {
            delayStyle = parseFloat(options.delay);
            // number in options.delay means we have to recalculate the delay for the closing timeout
            maxDelay = Math.max(delayStyle, 0);
          }
  
          if (flags.applyTransitionDelay) {
            temporaryStyles.push(getCssDelayStyle(delayStyle));
          }
  
          if (flags.applyAnimationDelay) {
            temporaryStyles.push(getCssDelayStyle(delayStyle, true));
          }
        }
  
        // we need to recalculate the delay value since we used a pre-emptive negative
        // delay value and the delay value is required for the final event checking. This
        // property will ensure that this will happen after the RAF phase has passed.
        if (options.duration == null && timings.transitionDuration > 0) {
          flags.recalculateTimingStyles = flags.recalculateTimingStyles || isFirst;
        }
  
        maxDelayTime = maxDelay * ONE_SECOND;
        maxDurationTime = maxDuration * ONE_SECOND;
        if (!options.skipBlocking) {
          flags.blockTransition = timings.transitionDuration > 0;
          flags.blockKeyframeAnimation = timings.animationDuration > 0 &&
                                         stagger.animationDelay > 0 &&
                                         stagger.animationDuration === 0;
        }
  
        if (options.from) {
          if (options.cleanupStyles) {
            registerRestorableStyles(restoreStyles, node, Object.keys(options.from));
          }
          applyAnimationFromStyles(element, options);
        }
  
        if (flags.blockTransition || flags.blockKeyframeAnimation) {
          applyBlocking(maxDuration);
        } else if (!options.skipBlocking) {
          blockTransitions(node, false);
        }
  
        // TODO(matsko): for 1.5 change this code to have an animator object for better debugging
        return {
          $$willAnimate: true,
          end: endFn,
          start: function() {
            if (animationClosed) return;
  
            runnerHost = {
              end: endFn,
              cancel: cancelFn,
              resume: null, //this will be set during the start() phase
              pause: null
            };
  
            runner = new $$AnimateRunner(runnerHost);
  
            waitUntilQuiet(start);
  
            // we don't have access to pause/resume the animation
            // since it hasn't run yet. AnimateRunner will therefore
            // set noop functions for resume and pause and they will
            // later be overridden once the animation is triggered
            return runner;
          }
        };
  
        function endFn() {
          close();
        }
  
        function cancelFn() {
          close(true);
        }
  
        function close(rejected) {
          // if the promise has been called already then we shouldn't close
          // the animation again
          if (animationClosed || (animationCompleted && animationPaused)) return;
          animationClosed = true;
          animationPaused = false;
  
          if (preparationClasses && !options.$$skipPreparationClasses) {
            $$jqLite.removeClass(element, preparationClasses);
          }
  
          if (activeClasses) {
            $$jqLite.removeClass(element, activeClasses);
          }
  
          blockKeyframeAnimations(node, false);
          blockTransitions(node, false);
  
          forEach(temporaryStyles, function(entry) {
            // There is only one way to remove inline style properties entirely from elements.
            // By using `removeProperty` this works, but we need to convert camel-cased CSS
            // styles down to hyphenated values.
            node.style[entry[0]] = '';
          });
  
          applyAnimationClasses(element, options);
          applyAnimationStyles(element, options);
  
          if (Object.keys(restoreStyles).length) {
            forEach(restoreStyles, function(value, prop) {
              if (value) {
                node.style.setProperty(prop, value);
              } else {
                node.style.removeProperty(prop);
              }
            });
          }
  
          // the reason why we have this option is to allow a synchronous closing callback
          // that is fired as SOON as the animation ends (when the CSS is removed) or if
          // the animation never takes off at all. A good example is a leave animation since
          // the element must be removed just after the animation is over or else the element
          // will appear on screen for one animation frame causing an overbearing flicker.
          if (options.onDone) {
            options.onDone();
          }
  
          if (events && events.length) {
            // Remove the transitionend / animationend listener(s)
            element.off(events.join(' '), onAnimationProgress);
          }
  
          //Cancel the fallback closing timeout and remove the timer data
          var animationTimerData = element.data(ANIMATE_TIMER_KEY);
          if (animationTimerData) {
            $timeout.cancel(animationTimerData[0].timer);
            element.removeData(ANIMATE_TIMER_KEY);
          }
  
          // if the preparation function fails then the promise is not setup
          if (runner) {
            runner.complete(!rejected);
          }
        }
  
        function applyBlocking(duration) {
          if (flags.blockTransition) {
            blockTransitions(node, duration);
          }
  
          if (flags.blockKeyframeAnimation) {
            blockKeyframeAnimations(node, !!duration);
          }
        }
  
        function closeAndReturnNoopAnimator() {
          runner = new $$AnimateRunner({
            end: endFn,
            cancel: cancelFn
          });
  
          // should flush the cache animation
          waitUntilQuiet(noop);
          close();
  
          return {
            $$willAnimate: false,
            start: function() {
              return runner;
            },
            end: endFn
          };
        }
  
        function onAnimationProgress(event) {
          event.stopPropagation();
          var ev = event.originalEvent || event;
  
          if (ev.target !== node) {
            // Since TransitionEvent / AnimationEvent bubble up,
            // we have to ignore events by finished child animations
            return;
          }
  
          // we now always use `Date.now()` due to the recent changes with
          // event.timeStamp in Firefox, Webkit and Chrome (see #13494 for more info)
          var timeStamp = ev.$manualTimeStamp || Date.now();
  
          /* Firefox (or possibly just Gecko) likes to not round values up
           * when a ms measurement is used for the animation */
          var elapsedTime = parseFloat(ev.elapsedTime.toFixed(ELAPSED_TIME_MAX_DECIMAL_PLACES));
  
          /* $manualTimeStamp is a mocked timeStamp value which is set
           * within browserTrigger(). This is only here so that tests can
           * mock animations properly. Real events fallback to event.timeStamp,
           * or, if they don't, then a timeStamp is automatically created for them.
           * We're checking to see if the timeStamp surpasses the expected delay,
           * but we're using elapsedTime instead of the timeStamp on the 2nd
           * pre-condition since animationPauseds sometimes close off early */
          if (Math.max(timeStamp - startTime, 0) >= maxDelayTime && elapsedTime >= maxDuration) {
            // we set this flag to ensure that if the transition is paused then, when resumed,
            // the animation will automatically close itself since transitions cannot be paused.
            animationCompleted = true;
            close();
          }
        }
  
        function start() {
          if (animationClosed) return;
          if (!node.parentNode) {
            close();
            return;
          }
  
          // even though we only pause keyframe animations here the pause flag
          // will still happen when transitions are used. Only the transition will
          // not be paused since that is not possible. If the animation ends when
          // paused then it will not complete until unpaused or cancelled.
          var playPause = function(playAnimation) {
            if (!animationCompleted) {
              animationPaused = !playAnimation;
              if (timings.animationDuration) {
                var value = blockKeyframeAnimations(node, animationPaused);
                if (animationPaused) {
                  temporaryStyles.push(value);
                } else {
                  removeFromArray(temporaryStyles, value);
                }
              }
            } else if (animationPaused && playAnimation) {
              animationPaused = false;
              close();
            }
          };
  
          // checking the stagger duration prevents an accidentally cascade of the CSS delay style
          // being inherited from the parent. If the transition duration is zero then we can safely
          // rely that the delay value is an intentional stagger delay style.
          var maxStagger = itemIndex > 0
                           && ((timings.transitionDuration && stagger.transitionDuration === 0) ||
                              (timings.animationDuration && stagger.animationDuration === 0))
                           && Math.max(stagger.animationDelay, stagger.transitionDelay);
          if (maxStagger) {
            $timeout(triggerAnimationStart,
                     Math.floor(maxStagger * itemIndex * ONE_SECOND),
                     false);
          } else {
            triggerAnimationStart();
          }
  
          // this will decorate the existing promise runner with pause/resume methods
          runnerHost.resume = function() {
            playPause(true);
          };
  
          runnerHost.pause = function() {
            playPause(false);
          };
  
          function triggerAnimationStart() {
            // just incase a stagger animation kicks in when the animation
            // itself was cancelled entirely
            if (animationClosed) return;
  
            applyBlocking(false);
  
            forEach(temporaryStyles, function(entry) {
              var key = entry[0];
              var value = entry[1];
              node.style[key] = value;
            });
  
            applyAnimationClasses(element, options);
            $$jqLite.addClass(element, activeClasses);
  
            if (flags.recalculateTimingStyles) {
              fullClassName = node.getAttribute('class') + ' ' + preparationClasses;
              cacheKey = $$animateCache.cacheKey(node, method, options.addClass, options.removeClass);
  
              timings = computeTimings(node, fullClassName, cacheKey, false);
              relativeDelay = timings.maxDelay;
              maxDelay = Math.max(relativeDelay, 0);
              maxDuration = timings.maxDuration;
  
              if (maxDuration === 0) {
                close();
                return;
              }
  
              flags.hasTransitions = timings.transitionDuration > 0;
              flags.hasAnimations = timings.animationDuration > 0;
            }
  
            if (flags.applyAnimationDelay) {
              relativeDelay = typeof options.delay !== 'boolean' && truthyTimingValue(options.delay)
                    ? parseFloat(options.delay)
                    : relativeDelay;
  
              maxDelay = Math.max(relativeDelay, 0);
              timings.animationDelay = relativeDelay;
              delayStyle = getCssDelayStyle(relativeDelay, true);
              temporaryStyles.push(delayStyle);
              node.style[delayStyle[0]] = delayStyle[1];
            }
  
            maxDelayTime = maxDelay * ONE_SECOND;
            maxDurationTime = maxDuration * ONE_SECOND;
  
            if (options.easing) {
              var easeProp, easeVal = options.easing;
              if (flags.hasTransitions) {
                easeProp = TRANSITION_PROP + TIMING_KEY;
                temporaryStyles.push([easeProp, easeVal]);
                node.style[easeProp] = easeVal;
              }
              if (flags.hasAnimations) {
                easeProp = ANIMATION_PROP + TIMING_KEY;
                temporaryStyles.push([easeProp, easeVal]);
                node.style[easeProp] = easeVal;
              }
            }
  
            if (timings.transitionDuration) {
              events.push(TRANSITIONEND_EVENT);
            }
  
            if (timings.animationDuration) {
              events.push(ANIMATIONEND_EVENT);
            }
  
            startTime = Date.now();
            var timerTime = maxDelayTime + CLOSING_TIME_BUFFER * maxDurationTime;
            var endTime = startTime + timerTime;
  
            var animationsData = element.data(ANIMATE_TIMER_KEY) || [];
            var setupFallbackTimer = true;
            if (animationsData.length) {
              var currentTimerData = animationsData[0];
              setupFallbackTimer = endTime > currentTimerData.expectedEndTime;
              if (setupFallbackTimer) {
                $timeout.cancel(currentTimerData.timer);
              } else {
                animationsData.push(close);
              }
            }
  
            if (setupFallbackTimer) {
              var timer = $timeout(onAnimationExpired, timerTime, false);
              animationsData[0] = {
                timer: timer,
                expectedEndTime: endTime
              };
              animationsData.push(close);
              element.data(ANIMATE_TIMER_KEY, animationsData);
            }
  
            if (events.length) {
              element.on(events.join(' '), onAnimationProgress);
            }
  
            if (options.to) {
              if (options.cleanupStyles) {
                registerRestorableStyles(restoreStyles, node, Object.keys(options.to));
              }
              applyAnimationToStyles(element, options);
            }
          }
  
          function onAnimationExpired() {
            var animationsData = element.data(ANIMATE_TIMER_KEY);
  
            // this will be false in the event that the element was
            // removed from the DOM (via a leave animation or something
            // similar)
            if (animationsData) {
              for (var i = 1; i < animationsData.length; i++) {
                animationsData[i]();
              }
              element.removeData(ANIMATE_TIMER_KEY);
            }
          }
        }
      };
    }];
  }];
  
  var $$AnimateCssDriverProvider = ['$$animationProvider', /** @this */ function($$animationProvider) {
    $$animationProvider.drivers.push('$$animateCssDriver');
  
    var NG_ANIMATE_SHIM_CLASS_NAME = 'ng-animate-shim';
    var NG_ANIMATE_ANCHOR_CLASS_NAME = 'ng-anchor';
  
    var NG_OUT_ANCHOR_CLASS_NAME = 'ng-anchor-out';
    var NG_IN_ANCHOR_CLASS_NAME = 'ng-anchor-in';
  
    function isDocumentFragment(node) {
      return node.parentNode && node.parentNode.nodeType === 11;
    }
  
    this.$get = ['$animateCss', '$rootScope', '$$AnimateRunner', '$rootElement', '$sniffer', '$$jqLite', '$document',
         function($animateCss,   $rootScope,   $$AnimateRunner,   $rootElement,   $sniffer,   $$jqLite,   $document) {
  
      // only browsers that support these properties can render animations
      if (!$sniffer.animations && !$sniffer.transitions) return noop;
  
      var bodyNode = $document[0].body;
      var rootNode = getDomNode($rootElement);
  
      var rootBodyElement = jqLite(
        // this is to avoid using something that exists outside of the body
        // we also special case the doc fragment case because our unit test code
        // appends the $rootElement to the body after the app has been bootstrapped
        isDocumentFragment(rootNode) || bodyNode.contains(rootNode) ? rootNode : bodyNode
      );
  
      return function initDriverFn(animationDetails) {
        return animationDetails.from && animationDetails.to
            ? prepareFromToAnchorAnimation(animationDetails.from,
                                           animationDetails.to,
                                           animationDetails.classes,
                                           animationDetails.anchors)
            : prepareRegularAnimation(animationDetails);
      };
  
      function filterCssClasses(classes) {
        //remove all the `ng-` stuff
        return classes.replace(/\bng-\S+\b/g, '');
      }
  
      function getUniqueValues(a, b) {
        if (isString(a)) a = a.split(' ');
        if (isString(b)) b = b.split(' ');
        return a.filter(function(val) {
          return b.indexOf(val) === -1;
        }).join(' ');
      }
  
      function prepareAnchoredAnimation(classes, outAnchor, inAnchor) {
        var clone = jqLite(getDomNode(outAnchor).cloneNode(true));
        var startingClasses = filterCssClasses(getClassVal(clone));
  
        outAnchor.addClass(NG_ANIMATE_SHIM_CLASS_NAME);
        inAnchor.addClass(NG_ANIMATE_SHIM_CLASS_NAME);
  
        clone.addClass(NG_ANIMATE_ANCHOR_CLASS_NAME);
  
        rootBodyElement.append(clone);
  
        var animatorIn, animatorOut = prepareOutAnimation();
  
        // the user may not end up using the `out` animation and
        // only making use of the `in` animation or vice-versa.
        // In either case we should allow this and not assume the
        // animation is over unless both animations are not used.
        if (!animatorOut) {
          animatorIn = prepareInAnimation();
          if (!animatorIn) {
            return end();
          }
        }
  
        var startingAnimator = animatorOut || animatorIn;
  
        return {
          start: function() {
            var runner;
  
            var currentAnimation = startingAnimator.start();
            currentAnimation.done(function() {
              currentAnimation = null;
              if (!animatorIn) {
                animatorIn = prepareInAnimation();
                if (animatorIn) {
                  currentAnimation = animatorIn.start();
                  currentAnimation.done(function() {
                    currentAnimation = null;
                    end();
                    runner.complete();
                  });
                  return currentAnimation;
                }
              }
              // in the event that there is no `in` animation
              end();
              runner.complete();
            });
  
            runner = new $$AnimateRunner({
              end: endFn,
              cancel: endFn
            });
  
            return runner;
  
            function endFn() {
              if (currentAnimation) {
                currentAnimation.end();
              }
            }
          }
        };
  
        function calculateAnchorStyles(anchor) {
          var styles = {};
  
          var coords = getDomNode(anchor).getBoundingClientRect();
  
          // we iterate directly since safari messes up and doesn't return
          // all the keys for the coords object when iterated
          forEach(['width','height','top','left'], function(key) {
            var value = coords[key];
            switch (key) {
              case 'top':
                value += bodyNode.scrollTop;
                break;
              case 'left':
                value += bodyNode.scrollLeft;
                break;
            }
            styles[key] = Math.floor(value) + 'px';
          });
          return styles;
        }
  
        function prepareOutAnimation() {
          var animator = $animateCss(clone, {
            addClass: NG_OUT_ANCHOR_CLASS_NAME,
            delay: true,
            from: calculateAnchorStyles(outAnchor)
          });
  
          // read the comment within `prepareRegularAnimation` to understand
          // why this check is necessary
          return animator.$$willAnimate ? animator : null;
        }
  
        function getClassVal(element) {
          return element.attr('class') || '';
        }
  
        function prepareInAnimation() {
          var endingClasses = filterCssClasses(getClassVal(inAnchor));
          var toAdd = getUniqueValues(endingClasses, startingClasses);
          var toRemove = getUniqueValues(startingClasses, endingClasses);
  
          var animator = $animateCss(clone, {
            to: calculateAnchorStyles(inAnchor),
            addClass: NG_IN_ANCHOR_CLASS_NAME + ' ' + toAdd,
            removeClass: NG_OUT_ANCHOR_CLASS_NAME + ' ' + toRemove,
            delay: true
          });
  
          // read the comment within `prepareRegularAnimation` to understand
          // why this check is necessary
          return animator.$$willAnimate ? animator : null;
        }
  
        function end() {
          clone.remove();
          outAnchor.removeClass(NG_ANIMATE_SHIM_CLASS_NAME);
          inAnchor.removeClass(NG_ANIMATE_SHIM_CLASS_NAME);
        }
      }
  
      function prepareFromToAnchorAnimation(from, to, classes, anchors) {
        var fromAnimation = prepareRegularAnimation(from, noop);
        var toAnimation = prepareRegularAnimation(to, noop);
  
        var anchorAnimations = [];
        forEach(anchors, function(anchor) {
          var outElement = anchor['out'];
          var inElement = anchor['in'];
          var animator = prepareAnchoredAnimation(classes, outElement, inElement);
          if (animator) {
            anchorAnimations.push(animator);
          }
        });
  
        // no point in doing anything when there are no elements to animate
        if (!fromAnimation && !toAnimation && anchorAnimations.length === 0) return;
  
        return {
          start: function() {
            var animationRunners = [];
  
            if (fromAnimation) {
              animationRunners.push(fromAnimation.start());
            }
  
            if (toAnimation) {
              animationRunners.push(toAnimation.start());
            }
  
            forEach(anchorAnimations, function(animation) {
              animationRunners.push(animation.start());
            });
  
            var runner = new $$AnimateRunner({
              end: endFn,
              cancel: endFn // CSS-driven animations cannot be cancelled, only ended
            });
  
            $$AnimateRunner.all(animationRunners, function(status) {
              runner.complete(status);
            });
  
            return runner;
  
            function endFn() {
              forEach(animationRunners, function(runner) {
                runner.end();
              });
            }
          }
        };
      }
  
      function prepareRegularAnimation(animationDetails) {
        var element = animationDetails.element;
        var options = animationDetails.options || {};
  
        if (animationDetails.structural) {
          options.event = animationDetails.event;
          options.structural = true;
          options.applyClassesEarly = true;
  
          // we special case the leave animation since we want to ensure that
          // the element is removed as soon as the animation is over. Otherwise
          // a flicker might appear or the element may not be removed at all
          if (animationDetails.event === 'leave') {
            options.onDone = options.domOperation;
          }
        }
  
        // We assign the preparationClasses as the actual animation event since
        // the internals of $animateCss will just suffix the event token values
        // with `-active` to trigger the animation.
        if (options.preparationClasses) {
          options.event = concatWithSpace(options.event, options.preparationClasses);
        }
  
        var animator = $animateCss(element, options);
  
        // the driver lookup code inside of $$animation attempts to spawn a
        // driver one by one until a driver returns a.$$willAnimate animator object.
        // $animateCss will always return an object, however, it will pass in
        // a flag as a hint as to whether an animation was detected or not
        return animator.$$willAnimate ? animator : null;
      }
    }];
  }];
  
  // TODO(matsko): use caching here to speed things up for detection
  // TODO(matsko): add documentation
  //  by the time...
  
  var $$AnimateJsProvider = ['$animateProvider', /** @this */ function($animateProvider) {
    this.$get = ['$injector', '$$AnimateRunner', '$$jqLite',
         function($injector,   $$AnimateRunner,   $$jqLite) {
  
      var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);
           // $animateJs(element, 'enter');
      return function(element, event, classes, options) {
        var animationClosed = false;
  
        // the `classes` argument is optional and if it is not used
        // then the classes will be resolved from the element's className
        // property as well as options.addClass/options.removeClass.
        if (arguments.length === 3 && isObject(classes)) {
          options = classes;
          classes = null;
        }
  
        options = prepareAnimationOptions(options);
        if (!classes) {
          classes = element.attr('class') || '';
          if (options.addClass) {
            classes += ' ' + options.addClass;
          }
          if (options.removeClass) {
            classes += ' ' + options.removeClass;
          }
        }
  
        var classesToAdd = options.addClass;
        var classesToRemove = options.removeClass;
  
        // the lookupAnimations function returns a series of animation objects that are
        // matched up with one or more of the CSS classes. These animation objects are
        // defined via the module.animation factory function. If nothing is detected then
        // we don't return anything which then makes $animation query the next driver.
        var animations = lookupAnimations(classes);
        var before, after;
        if (animations.length) {
          var afterFn, beforeFn;
          if (event === 'leave') {
            beforeFn = 'leave';
            afterFn = 'afterLeave'; // TODO(matsko): get rid of this
          } else {
            beforeFn = 'before' + event.charAt(0).toUpperCase() + event.substr(1);
            afterFn = event;
          }
  
          if (event !== 'enter' && event !== 'move') {
            before = packageAnimations(element, event, options, animations, beforeFn);
          }
          after  = packageAnimations(element, event, options, animations, afterFn);
        }
  
        // no matching animations
        if (!before && !after) return;
  
        function applyOptions() {
          options.domOperation();
          applyAnimationClasses(element, options);
        }
  
        function close() {
          animationClosed = true;
          applyOptions();
          applyAnimationStyles(element, options);
        }
  
        var runner;
  
        return {
          $$willAnimate: true,
          end: function() {
            if (runner) {
              runner.end();
            } else {
              close();
              runner = new $$AnimateRunner();
              runner.complete(true);
            }
            return runner;
          },
          start: function() {
            if (runner) {
              return runner;
            }
  
            runner = new $$AnimateRunner();
            var closeActiveAnimations;
            var chain = [];
  
            if (before) {
              chain.push(function(fn) {
                closeActiveAnimations = before(fn);
              });
            }
  
            if (chain.length) {
              chain.push(function(fn) {
                applyOptions();
                fn(true);
              });
            } else {
              applyOptions();
            }
  
            if (after) {
              chain.push(function(fn) {
                closeActiveAnimations = after(fn);
              });
            }
  
            runner.setHost({
              end: function() {
                endAnimations();
              },
              cancel: function() {
                endAnimations(true);
              }
            });
  
            $$AnimateRunner.chain(chain, onComplete);
            return runner;
  
            function onComplete(success) {
              close(success);
              runner.complete(success);
            }
  
            function endAnimations(cancelled) {
              if (!animationClosed) {
                (closeActiveAnimations || noop)(cancelled);
                onComplete(cancelled);
              }
            }
          }
        };
  
        function executeAnimationFn(fn, element, event, options, onDone) {
          var args;
          switch (event) {
            case 'animate':
              args = [element, options.from, options.to, onDone];
              break;
  
            case 'setClass':
              args = [element, classesToAdd, classesToRemove, onDone];
              break;
  
            case 'addClass':
              args = [element, classesToAdd, onDone];
              break;
  
            case 'removeClass':
              args = [element, classesToRemove, onDone];
              break;
  
            default:
              args = [element, onDone];
              break;
          }
  
          args.push(options);
  
          var value = fn.apply(fn, args);
          if (value) {
            if (isFunction(value.start)) {
              value = value.start();
            }
  
            if (value instanceof $$AnimateRunner) {
              value.done(onDone);
            } else if (isFunction(value)) {
              // optional onEnd / onCancel callback
              return value;
            }
          }
  
          return noop;
        }
  
        function groupEventedAnimations(element, event, options, animations, fnName) {
          var operations = [];
          forEach(animations, function(ani) {
            var animation = ani[fnName];
            if (!animation) return;
  
            // note that all of these animations will run in parallel
            operations.push(function() {
              var runner;
              var endProgressCb;
  
              var resolved = false;
              var onAnimationComplete = function(rejected) {
                if (!resolved) {
                  resolved = true;
                  (endProgressCb || noop)(rejected);
                  runner.complete(!rejected);
                }
              };
  
              runner = new $$AnimateRunner({
                end: function() {
                  onAnimationComplete();
                },
                cancel: function() {
                  onAnimationComplete(true);
                }
              });
  
              endProgressCb = executeAnimationFn(animation, element, event, options, function(result) {
                var cancelled = result === false;
                onAnimationComplete(cancelled);
              });
  
              return runner;
            });
          });
  
          return operations;
        }
  
        function packageAnimations(element, event, options, animations, fnName) {
          var operations = groupEventedAnimations(element, event, options, animations, fnName);
          if (operations.length === 0) {
            var a, b;
            if (fnName === 'beforeSetClass') {
              a = groupEventedAnimations(element, 'removeClass', options, animations, 'beforeRemoveClass');
              b = groupEventedAnimations(element, 'addClass', options, animations, 'beforeAddClass');
            } else if (fnName === 'setClass') {
              a = groupEventedAnimations(element, 'removeClass', options, animations, 'removeClass');
              b = groupEventedAnimations(element, 'addClass', options, animations, 'addClass');
            }
  
            if (a) {
              operations = operations.concat(a);
            }
            if (b) {
              operations = operations.concat(b);
            }
          }
  
          if (operations.length === 0) return;
  
          // TODO(matsko): add documentation
          return function startAnimation(callback) {
            var runners = [];
            if (operations.length) {
              forEach(operations, function(animateFn) {
                runners.push(animateFn());
              });
            }
  
            if (runners.length) {
              $$AnimateRunner.all(runners, callback);
            }  else {
              callback();
            }
  
            return function endFn(reject) {
              forEach(runners, function(runner) {
                if (reject) {
                  runner.cancel();
                } else {
                  runner.end();
                }
              });
            };
          };
        }
      };
  
      function lookupAnimations(classes) {
        classes = isArray(classes) ? classes : classes.split(' ');
        var matches = [], flagMap = {};
        for (var i = 0; i < classes.length; i++) {
          var klass = classes[i],
              animationFactory = $animateProvider.$$registeredAnimations[klass];
          if (animationFactory && !flagMap[klass]) {
            matches.push($injector.get(animationFactory));
            flagMap[klass] = true;
          }
        }
        return matches;
      }
    }];
  }];
  
  var $$AnimateJsDriverProvider = ['$$animationProvider', /** @this */ function($$animationProvider) {
    $$animationProvider.drivers.push('$$animateJsDriver');
    this.$get = ['$$animateJs', '$$AnimateRunner', function($$animateJs, $$AnimateRunner) {
      return function initDriverFn(animationDetails) {
        if (animationDetails.from && animationDetails.to) {
          var fromAnimation = prepareAnimation(animationDetails.from);
          var toAnimation = prepareAnimation(animationDetails.to);
          if (!fromAnimation && !toAnimation) return;
  
          return {
            start: function() {
              var animationRunners = [];
  
              if (fromAnimation) {
                animationRunners.push(fromAnimation.start());
              }
  
              if (toAnimation) {
                animationRunners.push(toAnimation.start());
              }
  
              $$AnimateRunner.all(animationRunners, done);
  
              var runner = new $$AnimateRunner({
                end: endFnFactory(),
                cancel: endFnFactory()
              });
  
              return runner;
  
              function endFnFactory() {
                return function() {
                  forEach(animationRunners, function(runner) {
                    // at this point we cannot cancel animations for groups just yet. 1.5+
                    runner.end();
                  });
                };
              }
  
              function done(status) {
                runner.complete(status);
              }
            }
          };
        } else {
          return prepareAnimation(animationDetails);
        }
      };
  
      function prepareAnimation(animationDetails) {
        // TODO(matsko): make sure to check for grouped animations and delegate down to normal animations
        var element = animationDetails.element;
        var event = animationDetails.event;
        var options = animationDetails.options;
        var classes = animationDetails.classes;
        return $$animateJs(element, event, classes, options);
      }
    }];
  }];
  
  var NG_ANIMATE_ATTR_NAME = 'data-ng-animate';
  var NG_ANIMATE_PIN_DATA = '$ngAnimatePin';
  var $$AnimateQueueProvider = ['$animateProvider', /** @this */ function($animateProvider) {
    var PRE_DIGEST_STATE = 1;
    var RUNNING_STATE = 2;
    var ONE_SPACE = ' ';
  
    var rules = this.rules = {
      skip: [],
      cancel: [],
      join: []
    };
  
    function getEventData(options) {
      return {
        addClass: options.addClass,
        removeClass: options.removeClass,
        from: options.from,
        to: options.to
      };
    }
  
    function makeTruthyCssClassMap(classString) {
      if (!classString) {
        return null;
      }
  
      var keys = classString.split(ONE_SPACE);
      var map = Object.create(null);
  
      forEach(keys, function(key) {
        map[key] = true;
      });
      return map;
    }
  
    function hasMatchingClasses(newClassString, currentClassString) {
      if (newClassString && currentClassString) {
        var currentClassMap = makeTruthyCssClassMap(currentClassString);
        return newClassString.split(ONE_SPACE).some(function(className) {
          return currentClassMap[className];
        });
      }
    }
  
    function isAllowed(ruleType, currentAnimation, previousAnimation) {
      return rules[ruleType].some(function(fn) {
        return fn(currentAnimation, previousAnimation);
      });
    }
  
    function hasAnimationClasses(animation, and) {
      var a = (animation.addClass || '').length > 0;
      var b = (animation.removeClass || '').length > 0;
      return and ? a && b : a || b;
    }
  
    rules.join.push(function(newAnimation, currentAnimation) {
      // if the new animation is class-based then we can just tack that on
      return !newAnimation.structural && hasAnimationClasses(newAnimation);
    });
  
    rules.skip.push(function(newAnimation, currentAnimation) {
      // there is no need to animate anything if no classes are being added and
      // there is no structural animation that will be triggered
      return !newAnimation.structural && !hasAnimationClasses(newAnimation);
    });
  
    rules.skip.push(function(newAnimation, currentAnimation) {
      // why should we trigger a new structural animation if the element will
      // be removed from the DOM anyway?
      return currentAnimation.event === 'leave' && newAnimation.structural;
    });
  
    rules.skip.push(function(newAnimation, currentAnimation) {
      // if there is an ongoing current animation then don't even bother running the class-based animation
      return currentAnimation.structural && currentAnimation.state === RUNNING_STATE && !newAnimation.structural;
    });
  
    rules.cancel.push(function(newAnimation, currentAnimation) {
      // there can never be two structural animations running at the same time
      return currentAnimation.structural && newAnimation.structural;
    });
  
    rules.cancel.push(function(newAnimation, currentAnimation) {
      // if the previous animation is already running, but the new animation will
      // be triggered, but the new animation is structural
      return currentAnimation.state === RUNNING_STATE && newAnimation.structural;
    });
  
    rules.cancel.push(function(newAnimation, currentAnimation) {
      // cancel the animation if classes added / removed in both animation cancel each other out,
      // but only if the current animation isn't structural
  
      if (currentAnimation.structural) return false;
  
      var nA = newAnimation.addClass;
      var nR = newAnimation.removeClass;
      var cA = currentAnimation.addClass;
      var cR = currentAnimation.removeClass;
  
      // early detection to save the global CPU shortage :)
      if ((isUndefined(nA) && isUndefined(nR)) || (isUndefined(cA) && isUndefined(cR))) {
        return false;
      }
  
      return hasMatchingClasses(nA, cR) || hasMatchingClasses(nR, cA);
    });
  
    this.$get = ['$$rAF', '$rootScope', '$rootElement', '$document', '$$Map',
                 '$$animation', '$$AnimateRunner', '$templateRequest', '$$jqLite', '$$forceReflow',
                 '$$isDocumentHidden',
         function($$rAF,   $rootScope,   $rootElement,   $document,   $$Map,
                  $$animation,   $$AnimateRunner,   $templateRequest,   $$jqLite,   $$forceReflow,
                  $$isDocumentHidden) {
  
      var activeAnimationsLookup = new $$Map();
      var disabledElementsLookup = new $$Map();
      var animationsEnabled = null;
  
      function removeFromDisabledElementsLookup(evt) {
        disabledElementsLookup.delete(evt.target);
      }
  
      function postDigestTaskFactory() {
        var postDigestCalled = false;
        return function(fn) {
          // we only issue a call to postDigest before
          // it has first passed. This prevents any callbacks
          // from not firing once the animation has completed
          // since it will be out of the digest cycle.
          if (postDigestCalled) {
            fn();
          } else {
            $rootScope.$$postDigest(function() {
              postDigestCalled = true;
              fn();
            });
          }
        };
      }
  
      // Wait until all directive and route-related templates are downloaded and
      // compiled. The $templateRequest.totalPendingRequests variable keeps track of
      // all of the remote templates being currently downloaded. If there are no
      // templates currently downloading then the watcher will still fire anyway.
      var deregisterWatch = $rootScope.$watch(
        function() { return $templateRequest.totalPendingRequests === 0; },
        function(isEmpty) {
          if (!isEmpty) return;
          deregisterWatch();
  
          // Now that all templates have been downloaded, $animate will wait until
          // the post digest queue is empty before enabling animations. By having two
          // calls to $postDigest calls we can ensure that the flag is enabled at the
          // very end of the post digest queue. Since all of the animations in $animate
          // use $postDigest, it's important that the code below executes at the end.
          // This basically means that the page is fully downloaded and compiled before
          // any animations are triggered.
          $rootScope.$$postDigest(function() {
            $rootScope.$$postDigest(function() {
              // we check for null directly in the event that the application already called
              // .enabled() with whatever arguments that it provided it with
              if (animationsEnabled === null) {
                animationsEnabled = true;
              }
            });
          });
        }
      );
  
      var callbackRegistry = Object.create(null);
  
      // remember that the `customFilter`/`classNameFilter` are set during the
      // provider/config stage therefore we can optimize here and setup helper functions
      var customFilter = $animateProvider.customFilter();
      var classNameFilter = $animateProvider.classNameFilter();
      var returnTrue = function() { return true; };
  
      var isAnimatableByFilter = customFilter || returnTrue;
      var isAnimatableClassName = !classNameFilter ? returnTrue : function(node, options) {
        var className = [node.getAttribute('class'), options.addClass, options.removeClass].join(' ');
        return classNameFilter.test(className);
      };
  
      var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);
  
      function normalizeAnimationDetails(element, animation) {
        return mergeAnimationDetails(element, animation, {});
      }
  
      // IE9-11 has no method "contains" in SVG element and in Node.prototype. Bug #10259.
      var contains = window.Node.prototype.contains || /** @this */ function(arg) {
        // eslint-disable-next-line no-bitwise
        return this === arg || !!(this.compareDocumentPosition(arg) & 16);
      };
  
      function findCallbacks(targetParentNode, targetNode, event) {
        var matches = [];
        var entries = callbackRegistry[event];
        if (entries) {
          forEach(entries, function(entry) {
            if (contains.call(entry.node, targetNode)) {
              matches.push(entry.callback);
            } else if (event === 'leave' && contains.call(entry.node, targetParentNode)) {
              matches.push(entry.callback);
            }
          });
        }
  
        return matches;
      }
  
      function filterFromRegistry(list, matchContainer, matchCallback) {
        var containerNode = extractElementNode(matchContainer);
        return list.filter(function(entry) {
          var isMatch = entry.node === containerNode &&
                          (!matchCallback || entry.callback === matchCallback);
          return !isMatch;
        });
      }
  
      function cleanupEventListeners(phase, node) {
        if (phase === 'close' && !node.parentNode) {
          // If the element is not attached to a parentNode, it has been removed by
          // the domOperation, and we can safely remove the event callbacks
          $animate.off(node);
        }
      }
  
      var $animate = {
        on: function(event, container, callback) {
          var node = extractElementNode(container);
          callbackRegistry[event] = callbackRegistry[event] || [];
          callbackRegistry[event].push({
            node: node,
            callback: callback
          });
  
          // Remove the callback when the element is removed from the DOM
          jqLite(container).on('$destroy', function() {
            var animationDetails = activeAnimationsLookup.get(node);
  
            if (!animationDetails) {
              // If there's an animation ongoing, the callback calling code will remove
              // the event listeners. If we'd remove here, the callbacks would be removed
              // before the animation ends
              $animate.off(event, container, callback);
            }
          });
        },
  
        off: function(event, container, callback) {
          if (arguments.length === 1 && !isString(arguments[0])) {
            container = arguments[0];
            for (var eventType in callbackRegistry) {
              callbackRegistry[eventType] = filterFromRegistry(callbackRegistry[eventType], container);
            }
  
            return;
          }
  
          var entries = callbackRegistry[event];
          if (!entries) return;
  
          callbackRegistry[event] = arguments.length === 1
              ? null
              : filterFromRegistry(entries, container, callback);
        },
  
        pin: function(element, parentElement) {
          assertArg(isElement(element), 'element', 'not an element');
          assertArg(isElement(parentElement), 'parentElement', 'not an element');
          element.data(NG_ANIMATE_PIN_DATA, parentElement);
        },
  
        push: function(element, event, options, domOperation) {
          options = options || {};
          options.domOperation = domOperation;
          return queueAnimation(element, event, options);
        },
  
        // this method has four signatures:
        //  () - global getter
        //  (bool) - global setter
        //  (element) - element getter
        //  (element, bool) - element setter<F37>
        enabled: function(element, bool) {
          var argCount = arguments.length;
  
          if (argCount === 0) {
            // () - Global getter
            bool = !!animationsEnabled;
          } else {
            var hasElement = isElement(element);
  
            if (!hasElement) {
              // (bool) - Global setter
              bool = animationsEnabled = !!element;
            } else {
              var node = getDomNode(element);
  
              if (argCount === 1) {
                // (element) - Element getter
                bool = !disabledElementsLookup.get(node);
              } else {
                // (element, bool) - Element setter
                if (!disabledElementsLookup.has(node)) {
                  // The element is added to the map for the first time.
                  // Create a listener to remove it on `$destroy` (to avoid memory leak).
                  jqLite(element).on('$destroy', removeFromDisabledElementsLookup);
                }
                disabledElementsLookup.set(node, !bool);
              }
            }
          }
  
          return bool;
        }
      };
  
      return $animate;
  
      function queueAnimation(originalElement, event, initialOptions) {
        // we always make a copy of the options since
        // there should never be any side effects on
        // the input data when running `$animateCss`.
        var options = copy(initialOptions);
  
        var element = stripCommentsFromElement(originalElement);
        var node = getDomNode(element);
        var parentNode = node && node.parentNode;
  
        options = prepareAnimationOptions(options);
  
        // we create a fake runner with a working promise.
        // These methods will become available after the digest has passed
        var runner = new $$AnimateRunner();
  
        // this is used to trigger callbacks in postDigest mode
        var runInNextPostDigestOrNow = postDigestTaskFactory();
  
        if (isArray(options.addClass)) {
          options.addClass = options.addClass.join(' ');
        }
  
        if (options.addClass && !isString(options.addClass)) {
          options.addClass = null;
        }
  
        if (isArray(options.removeClass)) {
          options.removeClass = options.removeClass.join(' ');
        }
  
        if (options.removeClass && !isString(options.removeClass)) {
          options.removeClass = null;
        }
  
        if (options.from && !isObject(options.from)) {
          options.from = null;
        }
  
        if (options.to && !isObject(options.to)) {
          options.to = null;
        }
  
        // If animations are hard-disabled for the whole application there is no need to continue.
        // There are also situations where a directive issues an animation for a jqLite wrapper that
        // contains only comment nodes. In this case, there is no way we can perform an animation.
        if (!animationsEnabled ||
            !node ||
            !isAnimatableByFilter(node, event, initialOptions) ||
            !isAnimatableClassName(node, options)) {
          close();
          return runner;
        }
  
        var isStructural = ['enter', 'move', 'leave'].indexOf(event) >= 0;
  
        var documentHidden = $$isDocumentHidden();
  
        // This is a hard disable of all animations the element itself, therefore  there is no need to
        // continue further past this point if not enabled
        // Animations are also disabled if the document is currently hidden (page is not visible
        // to the user), because browsers slow down or do not flush calls to requestAnimationFrame
        var skipAnimations = documentHidden || disabledElementsLookup.get(node);
        var existingAnimation = (!skipAnimations && activeAnimationsLookup.get(node)) || {};
        var hasExistingAnimation = !!existingAnimation.state;
  
        // there is no point in traversing the same collection of parent ancestors if a followup
        // animation will be run on the same element that already did all that checking work
        if (!skipAnimations && (!hasExistingAnimation || existingAnimation.state !== PRE_DIGEST_STATE)) {
          skipAnimations = !areAnimationsAllowed(node, parentNode, event);
        }
  
        if (skipAnimations) {
          // Callbacks should fire even if the document is hidden (regression fix for issue #14120)
          if (documentHidden) notifyProgress(runner, event, 'start', getEventData(options));
          close();
          if (documentHidden) notifyProgress(runner, event, 'close', getEventData(options));
          return runner;
        }
  
        if (isStructural) {
          closeChildAnimations(node);
        }
  
        var newAnimation = {
          structural: isStructural,
          element: element,
          event: event,
          addClass: options.addClass,
          removeClass: options.removeClass,
          close: close,
          options: options,
          runner: runner
        };
  
        if (hasExistingAnimation) {
          var skipAnimationFlag = isAllowed('skip', newAnimation, existingAnimation);
          if (skipAnimationFlag) {
            if (existingAnimation.state === RUNNING_STATE) {
              close();
              return runner;
            } else {
              mergeAnimationDetails(element, existingAnimation, newAnimation);
              return existingAnimation.runner;
            }
          }
          var cancelAnimationFlag = isAllowed('cancel', newAnimation, existingAnimation);
          if (cancelAnimationFlag) {
            if (existingAnimation.state === RUNNING_STATE) {
              // this will end the animation right away and it is safe
              // to do so since the animation is already running and the
              // runner callback code will run in async
              existingAnimation.runner.end();
            } else if (existingAnimation.structural) {
              // this means that the animation is queued into a digest, but
              // hasn't started yet. Therefore it is safe to run the close
              // method which will call the runner methods in async.
              existingAnimation.close();
            } else {
              // this will merge the new animation options into existing animation options
              mergeAnimationDetails(element, existingAnimation, newAnimation);
  
              return existingAnimation.runner;
            }
          } else {
            // a joined animation means that this animation will take over the existing one
            // so an example would involve a leave animation taking over an enter. Then when
            // the postDigest kicks in the enter will be ignored.
            var joinAnimationFlag = isAllowed('join', newAnimation, existingAnimation);
            if (joinAnimationFlag) {
              if (existingAnimation.state === RUNNING_STATE) {
                normalizeAnimationDetails(element, newAnimation);
              } else {
                applyGeneratedPreparationClasses($$jqLite, element, isStructural ? event : null, options);
  
                event = newAnimation.event = existingAnimation.event;
                options = mergeAnimationDetails(element, existingAnimation, newAnimation);
  
                //we return the same runner since only the option values of this animation will
                //be fed into the `existingAnimation`.
                return existingAnimation.runner;
              }
            }
          }
        } else {
          // normalization in this case means that it removes redundant CSS classes that
          // already exist (addClass) or do not exist (removeClass) on the element
          normalizeAnimationDetails(element, newAnimation);
        }
  
        // when the options are merged and cleaned up we may end up not having to do
        // an animation at all, therefore we should check this before issuing a post
        // digest callback. Structural animations will always run no matter what.
        var isValidAnimation = newAnimation.structural;
        if (!isValidAnimation) {
          // animate (from/to) can be quickly checked first, otherwise we check if any classes are present
          isValidAnimation = (newAnimation.event === 'animate' && Object.keys(newAnimation.options.to || {}).length > 0)
                              || hasAnimationClasses(newAnimation);
        }
  
        if (!isValidAnimation) {
          close();
          clearElementAnimationState(node);
          return runner;
        }
  
        // the counter keeps track of cancelled animations
        var counter = (existingAnimation.counter || 0) + 1;
        newAnimation.counter = counter;
  
        markElementAnimationState(node, PRE_DIGEST_STATE, newAnimation);
  
        $rootScope.$$postDigest(function() {
          // It is possible that the DOM nodes inside `originalElement` have been replaced. This can
          // happen if the animated element is a transcluded clone and also has a `templateUrl`
          // directive on it. Therefore, we must recreate `element` in order to interact with the
          // actual DOM nodes.
          // Note: We still need to use the old `node` for certain things, such as looking up in
          //       HashMaps where it was used as the key.
  
          element = stripCommentsFromElement(originalElement);
  
          var animationDetails = activeAnimationsLookup.get(node);
          var animationCancelled = !animationDetails;
          animationDetails = animationDetails || {};
  
          // if addClass/removeClass is called before something like enter then the
          // registered parent element may not be present. The code below will ensure
          // that a final value for parent element is obtained
          var parentElement = element.parent() || [];
  
          // animate/structural/class-based animations all have requirements. Otherwise there
          // is no point in performing an animation. The parent node must also be set.
          var isValidAnimation = parentElement.length > 0
                                  && (animationDetails.event === 'animate'
                                      || animationDetails.structural
                                      || hasAnimationClasses(animationDetails));
  
          // this means that the previous animation was cancelled
          // even if the follow-up animation is the same event
          if (animationCancelled || animationDetails.counter !== counter || !isValidAnimation) {
            // if another animation did not take over then we need
            // to make sure that the domOperation and options are
            // handled accordingly
            if (animationCancelled) {
              applyAnimationClasses(element, options);
              applyAnimationStyles(element, options);
            }
  
            // if the event changed from something like enter to leave then we do
            // it, otherwise if it's the same then the end result will be the same too
            if (animationCancelled || (isStructural && animationDetails.event !== event)) {
              options.domOperation();
              runner.end();
            }
  
            // in the event that the element animation was not cancelled or a follow-up animation
            // isn't allowed to animate from here then we need to clear the state of the element
            // so that any future animations won't read the expired animation data.
            if (!isValidAnimation) {
              clearElementAnimationState(node);
            }
  
            return;
          }
  
          // this combined multiple class to addClass / removeClass into a setClass event
          // so long as a structural event did not take over the animation
          event = !animationDetails.structural && hasAnimationClasses(animationDetails, true)
              ? 'setClass'
              : animationDetails.event;
  
          markElementAnimationState(node, RUNNING_STATE);
          var realRunner = $$animation(element, event, animationDetails.options);
  
          // this will update the runner's flow-control events based on
          // the `realRunner` object.
          runner.setHost(realRunner);
          notifyProgress(runner, event, 'start', getEventData(options));
  
          realRunner.done(function(status) {
            close(!status);
            var animationDetails = activeAnimationsLookup.get(node);
            if (animationDetails && animationDetails.counter === counter) {
              clearElementAnimationState(node);
            }
            notifyProgress(runner, event, 'close', getEventData(options));
          });
        });
  
        return runner;
  
        function notifyProgress(runner, event, phase, data) {
          runInNextPostDigestOrNow(function() {
            var callbacks = findCallbacks(parentNode, node, event);
            if (callbacks.length) {
              // do not optimize this call here to RAF because
              // we don't know how heavy the callback code here will
              // be and if this code is buffered then this can
              // lead to a performance regression.
              $$rAF(function() {
                forEach(callbacks, function(callback) {
                  callback(element, phase, data);
                });
                cleanupEventListeners(phase, node);
              });
            } else {
              cleanupEventListeners(phase, node);
            }
          });
          runner.progress(event, phase, data);
        }
  
        function close(reject) {
          clearGeneratedClasses(element, options);
          applyAnimationClasses(element, options);
          applyAnimationStyles(element, options);
          options.domOperation();
          runner.complete(!reject);
        }
      }
  
      function closeChildAnimations(node) {
        var children = node.querySelectorAll('[' + NG_ANIMATE_ATTR_NAME + ']');
        forEach(children, function(child) {
          var state = parseInt(child.getAttribute(NG_ANIMATE_ATTR_NAME), 10);
          var animationDetails = activeAnimationsLookup.get(child);
          if (animationDetails) {
            switch (state) {
              case RUNNING_STATE:
                animationDetails.runner.end();
                /* falls through */
              case PRE_DIGEST_STATE:
                activeAnimationsLookup.delete(child);
                break;
            }
          }
        });
      }
  
      function clearElementAnimationState(node) {
        node.removeAttribute(NG_ANIMATE_ATTR_NAME);
        activeAnimationsLookup.delete(node);
      }
  
      /**
       * This fn returns false if any of the following is true:
       * a) animations on any parent element are disabled, and animations on the element aren't explicitly allowed
       * b) a parent element has an ongoing structural animation, and animateChildren is false
       * c) the element is not a child of the body
       * d) the element is not a child of the $rootElement
       */
      function areAnimationsAllowed(node, parentNode, event) {
        var bodyNode = $document[0].body;
        var rootNode = getDomNode($rootElement);
  
        var bodyNodeDetected = (node === bodyNode) || node.nodeName === 'HTML';
        var rootNodeDetected = (node === rootNode);
        var parentAnimationDetected = false;
        var elementDisabled = disabledElementsLookup.get(node);
        var animateChildren;
  
        var parentHost = jqLite.data(node, NG_ANIMATE_PIN_DATA);
        if (parentHost) {
          parentNode = getDomNode(parentHost);
        }
  
        while (parentNode) {
          if (!rootNodeDetected) {
            // AngularJS doesn't want to attempt to animate elements outside of the application
            // therefore we need to ensure that the rootElement is an ancestor of the current element
            rootNodeDetected = (parentNode === rootNode);
          }
  
          if (parentNode.nodeType !== ELEMENT_NODE) {
            // no point in inspecting the #document element
            break;
          }
  
          var details = activeAnimationsLookup.get(parentNode) || {};
          // either an enter, leave or move animation will commence
          // therefore we can't allow any animations to take place
          // but if a parent animation is class-based then that's ok
          if (!parentAnimationDetected) {
            var parentNodeDisabled = disabledElementsLookup.get(parentNode);
  
            if (parentNodeDisabled === true && elementDisabled !== false) {
              // disable animations if the user hasn't explicitly enabled animations on the
              // current element
              elementDisabled = true;
              // element is disabled via parent element, no need to check anything else
              break;
            } else if (parentNodeDisabled === false) {
              elementDisabled = false;
            }
            parentAnimationDetected = details.structural;
          }
  
          if (isUndefined(animateChildren) || animateChildren === true) {
            var value = jqLite.data(parentNode, NG_ANIMATE_CHILDREN_DATA);
            if (isDefined(value)) {
              animateChildren = value;
            }
          }
  
          // there is no need to continue traversing at this point
          if (parentAnimationDetected && animateChildren === false) break;
  
          if (!bodyNodeDetected) {
            // we also need to ensure that the element is or will be a part of the body element
            // otherwise it is pointless to even issue an animation to be rendered
            bodyNodeDetected = (parentNode === bodyNode);
          }
  
          if (bodyNodeDetected && rootNodeDetected) {
            // If both body and root have been found, any other checks are pointless,
            // as no animation data should live outside the application
            break;
          }
  
          if (!rootNodeDetected) {
            // If `rootNode` is not detected, check if `parentNode` is pinned to another element
            parentHost = jqLite.data(parentNode, NG_ANIMATE_PIN_DATA);
            if (parentHost) {
              // The pin target element becomes the next parent element
              parentNode = getDomNode(parentHost);
              continue;
            }
          }
  
          parentNode = parentNode.parentNode;
        }
  
        var allowAnimation = (!parentAnimationDetected || animateChildren) && elementDisabled !== true;
        return allowAnimation && rootNodeDetected && bodyNodeDetected;
      }
  
      function markElementAnimationState(node, state, details) {
        details = details || {};
        details.state = state;
  
        node.setAttribute(NG_ANIMATE_ATTR_NAME, state);
  
        var oldValue = activeAnimationsLookup.get(node);
        var newValue = oldValue
            ? extend(oldValue, details)
            : details;
        activeAnimationsLookup.set(node, newValue);
      }
    }];
  }];
  
  /** @this */
  var $$AnimateCacheProvider = function() {
  
    var KEY = '$$ngAnimateParentKey';
    var parentCounter = 0;
    var cache = Object.create(null);
  
    this.$get = [function() {
      return {
        cacheKey: function(node, method, addClass, removeClass) {
          var parentNode = node.parentNode;
          var parentID = parentNode[KEY] || (parentNode[KEY] = ++parentCounter);
          var parts = [parentID, method, node.getAttribute('class')];
          if (addClass) {
            parts.push(addClass);
          }
          if (removeClass) {
            parts.push(removeClass);
          }
          return parts.join(' ');
        },
  
        containsCachedAnimationWithoutDuration: function(key) {
          var entry = cache[key];
  
          // nothing cached, so go ahead and animate
          // otherwise it should be a valid animation
          return (entry && !entry.isValid) || false;
        },
  
        flush: function() {
          cache = Object.create(null);
        },
  
        count: function(key) {
          var entry = cache[key];
          return entry ? entry.total : 0;
        },
  
        get: function(key) {
          var entry = cache[key];
          return entry && entry.value;
        },
  
        put: function(key, value, isValid) {
          if (!cache[key]) {
            cache[key] = { total: 1, value: value, isValid: isValid };
          } else {
            cache[key].total++;
            cache[key].value = value;
          }
        }
      };
    }];
  };
  
  /* exported $$AnimationProvider */
  
  var $$AnimationProvider = ['$animateProvider', /** @this */ function($animateProvider) {
    var NG_ANIMATE_REF_ATTR = 'ng-animate-ref';
  
    var drivers = this.drivers = [];
  
    var RUNNER_STORAGE_KEY = '$$animationRunner';
    var PREPARE_CLASSES_KEY = '$$animatePrepareClasses';
  
    function setRunner(element, runner) {
      element.data(RUNNER_STORAGE_KEY, runner);
    }
  
    function removeRunner(element) {
      element.removeData(RUNNER_STORAGE_KEY);
    }
  
    function getRunner(element) {
      return element.data(RUNNER_STORAGE_KEY);
    }
  
    this.$get = ['$$jqLite', '$rootScope', '$injector', '$$AnimateRunner', '$$Map', '$$rAFScheduler', '$$animateCache',
         function($$jqLite,   $rootScope,   $injector,   $$AnimateRunner,   $$Map,   $$rAFScheduler, $$animateCache) {
  
      var animationQueue = [];
      var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);
  
      function sortAnimations(animations) {
        var tree = { children: [] };
        var i, lookup = new $$Map();
  
        // this is done first beforehand so that the map
        // is filled with a list of the elements that will be animated
        for (i = 0; i < animations.length; i++) {
          var animation = animations[i];
          lookup.set(animation.domNode, animations[i] = {
            domNode: animation.domNode,
            element: animation.element,
            fn: animation.fn,
            children: []
          });
        }
  
        for (i = 0; i < animations.length; i++) {
          processNode(animations[i]);
        }
  
        return flatten(tree);
  
        function processNode(entry) {
          if (entry.processed) return entry;
          entry.processed = true;
  
          var elementNode = entry.domNode;
          var parentNode = elementNode.parentNode;
          lookup.set(elementNode, entry);
  
          var parentEntry;
          while (parentNode) {
            parentEntry = lookup.get(parentNode);
            if (parentEntry) {
              if (!parentEntry.processed) {
                parentEntry = processNode(parentEntry);
              }
              break;
            }
            parentNode = parentNode.parentNode;
          }
  
          (parentEntry || tree).children.push(entry);
          return entry;
        }
  
        function flatten(tree) {
          var result = [];
          var queue = [];
          var i;
  
          for (i = 0; i < tree.children.length; i++) {
            queue.push(tree.children[i]);
          }
  
          var remainingLevelEntries = queue.length;
          var nextLevelEntries = 0;
          var row = [];
  
          for (i = 0; i < queue.length; i++) {
            var entry = queue[i];
            if (remainingLevelEntries <= 0) {
              remainingLevelEntries = nextLevelEntries;
              nextLevelEntries = 0;
              result.push(row);
              row = [];
            }
            row.push(entry);
            entry.children.forEach(function(childEntry) {
              nextLevelEntries++;
              queue.push(childEntry);
            });
            remainingLevelEntries--;
          }
  
          if (row.length) {
            result.push(row);
          }
  
          return result;
        }
      }
  
      // TODO(matsko): document the signature in a better way
      return function(element, event, options) {
        options = prepareAnimationOptions(options);
        var isStructural = ['enter', 'move', 'leave'].indexOf(event) >= 0;
  
        // there is no animation at the current moment, however
        // these runner methods will get later updated with the
        // methods leading into the driver's end/cancel methods
        // for now they just stop the animation from starting
        var runner = new $$AnimateRunner({
          end: function() { close(); },
          cancel: function() { close(true); }
        });
  
        if (!drivers.length) {
          close();
          return runner;
        }
  
        var classes = mergeClasses(element.attr('class'), mergeClasses(options.addClass, options.removeClass));
        var tempClasses = options.tempClasses;
        if (tempClasses) {
          classes += ' ' + tempClasses;
          options.tempClasses = null;
        }
  
        if (isStructural) {
          element.data(PREPARE_CLASSES_KEY, 'ng-' + event + PREPARE_CLASS_SUFFIX);
        }
  
        setRunner(element, runner);
  
        animationQueue.push({
          // this data is used by the postDigest code and passed into
          // the driver step function
          element: element,
          classes: classes,
          event: event,
          structural: isStructural,
          options: options,
          beforeStart: beforeStart,
          close: close
        });
  
        element.on('$destroy', handleDestroyedElement);
  
        // we only want there to be one function called within the post digest
        // block. This way we can group animations for all the animations that
        // were apart of the same postDigest flush call.
        if (animationQueue.length > 1) return runner;
  
        $rootScope.$$postDigest(function() {
          var animations = [];
          forEach(animationQueue, function(entry) {
            // the element was destroyed early on which removed the runner
            // form its storage. This means we can't animate this element
            // at all and it already has been closed due to destruction.
            if (getRunner(entry.element)) {
              animations.push(entry);
            } else {
              entry.close();
            }
          });
  
          // now any future animations will be in another postDigest
          animationQueue.length = 0;
  
          var groupedAnimations = groupAnimations(animations);
          var toBeSortedAnimations = [];
  
          forEach(groupedAnimations, function(animationEntry) {
            var element = animationEntry.from ? animationEntry.from.element : animationEntry.element;
            var extraClasses = options.addClass;
  
            extraClasses = (extraClasses ? (extraClasses + ' ') : '') + NG_ANIMATE_CLASSNAME;
            var cacheKey = $$animateCache.cacheKey(element[0], animationEntry.event, extraClasses, options.removeClass);
  
            toBeSortedAnimations.push({
              element: element,
              domNode: getDomNode(element),
              fn: function triggerAnimationStart() {
                var startAnimationFn, closeFn = animationEntry.close;
  
                // in the event that we've cached the animation status for this element
                // and it's in fact an invalid animation (something that has duration = 0)
                // then we should skip all the heavy work from here on
                if ($$animateCache.containsCachedAnimationWithoutDuration(cacheKey)) {
                  closeFn();
                  return;
                }
  
                // it's important that we apply the `ng-animate` CSS class and the
                // temporary classes before we do any driver invoking since these
                // CSS classes may be required for proper CSS detection.
                animationEntry.beforeStart();
  
                // in the event that the element was removed before the digest runs or
                // during the RAF sequencing then we should not trigger the animation.
                var targetElement = animationEntry.anchors
                    ? (animationEntry.from.element || animationEntry.to.element)
                    : animationEntry.element;
  
                if (getRunner(targetElement)) {
                  var operation = invokeFirstDriver(animationEntry);
                  if (operation) {
                    startAnimationFn = operation.start;
                  }
                }
  
                if (!startAnimationFn) {
                  closeFn();
                } else {
                  var animationRunner = startAnimationFn();
                  animationRunner.done(function(status) {
                    closeFn(!status);
                  });
                  updateAnimationRunners(animationEntry, animationRunner);
                }
              }
            });
          });
  
          // we need to sort each of the animations in order of parent to child
          // relationships. This ensures that the child classes are applied at the
          // right time.
          var finalAnimations = sortAnimations(toBeSortedAnimations);
          for (var i = 0; i < finalAnimations.length; i++) {
            var innerArray = finalAnimations[i];
            for (var j = 0; j < innerArray.length; j++) {
              var entry = innerArray[j];
              var element = entry.element;
  
              // the RAFScheduler code only uses functions
              finalAnimations[i][j] = entry.fn;
  
              // the first row of elements shouldn't have a prepare-class added to them
              // since the elements are at the top of the animation hierarchy and they
              // will be applied without a RAF having to pass...
              if (i === 0) {
                element.removeData(PREPARE_CLASSES_KEY);
                continue;
              }
  
              var prepareClassName = element.data(PREPARE_CLASSES_KEY);
              if (prepareClassName) {
                $$jqLite.addClass(element, prepareClassName);
              }
            }
          }
  
          $$rAFScheduler(finalAnimations);
        });
  
        return runner;
  
        // TODO(matsko): change to reference nodes
        function getAnchorNodes(node) {
          var SELECTOR = '[' + NG_ANIMATE_REF_ATTR + ']';
          var items = node.hasAttribute(NG_ANIMATE_REF_ATTR)
                ? [node]
                : node.querySelectorAll(SELECTOR);
          var anchors = [];
          forEach(items, function(node) {
            var attr = node.getAttribute(NG_ANIMATE_REF_ATTR);
            if (attr && attr.length) {
              anchors.push(node);
            }
          });
          return anchors;
        }
  
        function groupAnimations(animations) {
          var preparedAnimations = [];
          var refLookup = {};
          forEach(animations, function(animation, index) {
            var element = animation.element;
            var node = getDomNode(element);
            var event = animation.event;
            var enterOrMove = ['enter', 'move'].indexOf(event) >= 0;
            var anchorNodes = animation.structural ? getAnchorNodes(node) : [];
  
            if (anchorNodes.length) {
              var direction = enterOrMove ? 'to' : 'from';
  
              forEach(anchorNodes, function(anchor) {
                var key = anchor.getAttribute(NG_ANIMATE_REF_ATTR);
                refLookup[key] = refLookup[key] || {};
                refLookup[key][direction] = {
                  animationID: index,
                  element: jqLite(anchor)
                };
              });
            } else {
              preparedAnimations.push(animation);
            }
          });
  
          var usedIndicesLookup = {};
          var anchorGroups = {};
          forEach(refLookup, function(operations, key) {
            var from = operations.from;
            var to = operations.to;
  
            if (!from || !to) {
              // only one of these is set therefore we can't have an
              // anchor animation since all three pieces are required
              var index = from ? from.animationID : to.animationID;
              var indexKey = index.toString();
              if (!usedIndicesLookup[indexKey]) {
                usedIndicesLookup[indexKey] = true;
                preparedAnimations.push(animations[index]);
              }
              return;
            }
  
            var fromAnimation = animations[from.animationID];
            var toAnimation = animations[to.animationID];
            var lookupKey = from.animationID.toString();
            if (!anchorGroups[lookupKey]) {
              var group = anchorGroups[lookupKey] = {
                structural: true,
                beforeStart: function() {
                  fromAnimation.beforeStart();
                  toAnimation.beforeStart();
                },
                close: function() {
                  fromAnimation.close();
                  toAnimation.close();
                },
                classes: cssClassesIntersection(fromAnimation.classes, toAnimation.classes),
                from: fromAnimation,
                to: toAnimation,
                anchors: [] // TODO(matsko): change to reference nodes
              };
  
              // the anchor animations require that the from and to elements both have at least
              // one shared CSS class which effectively marries the two elements together to use
              // the same animation driver and to properly sequence the anchor animation.
              if (group.classes.length) {
                preparedAnimations.push(group);
              } else {
                preparedAnimations.push(fromAnimation);
                preparedAnimations.push(toAnimation);
              }
            }
  
            anchorGroups[lookupKey].anchors.push({
              'out': from.element, 'in': to.element
            });
          });
  
          return preparedAnimations;
        }
  
        function cssClassesIntersection(a,b) {
          a = a.split(' ');
          b = b.split(' ');
          var matches = [];
  
          for (var i = 0; i < a.length; i++) {
            var aa = a[i];
            if (aa.substring(0,3) === 'ng-') continue;
  
            for (var j = 0; j < b.length; j++) {
              if (aa === b[j]) {
                matches.push(aa);
                break;
              }
            }
          }
  
          return matches.join(' ');
        }
  
        function invokeFirstDriver(animationDetails) {
          // we loop in reverse order since the more general drivers (like CSS and JS)
          // may attempt more elements, but custom drivers are more particular
          for (var i = drivers.length - 1; i >= 0; i--) {
            var driverName = drivers[i];
            var factory = $injector.get(driverName);
            var driver = factory(animationDetails);
            if (driver) {
              return driver;
            }
          }
        }
  
        function beforeStart() {
          tempClasses = (tempClasses ? (tempClasses + ' ') : '') + NG_ANIMATE_CLASSNAME;
          $$jqLite.addClass(element, tempClasses);
  
          var prepareClassName = element.data(PREPARE_CLASSES_KEY);
          if (prepareClassName) {
            $$jqLite.removeClass(element, prepareClassName);
            prepareClassName = null;
          }
        }
  
        function updateAnimationRunners(animation, newRunner) {
          if (animation.from && animation.to) {
            update(animation.from.element);
            update(animation.to.element);
          } else {
            update(animation.element);
          }
  
          function update(element) {
            var runner = getRunner(element);
            if (runner) runner.setHost(newRunner);
          }
        }
  
        function handleDestroyedElement() {
          var runner = getRunner(element);
          if (runner && (event !== 'leave' || !options.$$domOperationFired)) {
            runner.end();
          }
        }
  
        function close(rejected) {
          element.off('$destroy', handleDestroyedElement);
          removeRunner(element);
  
          applyAnimationClasses(element, options);
          applyAnimationStyles(element, options);
          options.domOperation();
  
          if (tempClasses) {
            $$jqLite.removeClass(element, tempClasses);
          }
  
          runner.complete(!rejected);
        }
      };
    }];
  }];
  
  /**
   * @ngdoc directive
   * @name ngAnimateSwap
   * @restrict A
   * @scope
   *
   * @description
   *
   * ngAnimateSwap is a animation-oriented directive that allows for the container to
   * be removed and entered in whenever the associated expression changes. A
   * common usecase for this directive is a rotating banner or slider component which
   * contains one image being present at a time. When the active image changes
   * then the old image will perform a `leave` animation and the new element
   * will be inserted via an `enter` animation.
   *
   * @animations
   * | Animation                        | Occurs                               |
   * |----------------------------------|--------------------------------------|
   * | {@link ng.$animate#enter enter}  | when the new element is inserted to the DOM  |
   * | {@link ng.$animate#leave leave}  | when the old element is removed from the DOM |
   *
   * @example
   * <example name="ngAnimateSwap-directive" module="ngAnimateSwapExample"
   *          deps="angular-animate.js"
   *          animations="true" fixBase="true">
   *   <file name="index.html">
   *     <div class="container" ng-controller="AppCtrl">
   *       <div ng-animate-swap="number" class="cell swap-animation" ng-class="colorClass(number)">
   *         {{ number }}
   *       </div>
   *     </div>
   *   </file>
   *   <file name="script.js">
   *     angular.module('ngAnimateSwapExample', ['ngAnimate'])
   *       .controller('AppCtrl', ['$scope', '$interval', function($scope, $interval) {
   *         $scope.number = 0;
   *         $interval(function() {
   *           $scope.number++;
   *         }, 1000);
   *
   *         var colors = ['red','blue','green','yellow','orange'];
   *         $scope.colorClass = function(number) {
   *           return colors[number % colors.length];
   *         };
   *       }]);
   *   </file>
   *  <file name="animations.css">
   *  .container {
   *    height:250px;
   *    width:250px;
   *    position:relative;
   *    overflow:hidden;
   *    border:2px solid black;
   *  }
   *  .container .cell {
   *    font-size:150px;
   *    text-align:center;
   *    line-height:250px;
   *    position:absolute;
   *    top:0;
   *    left:0;
   *    right:0;
   *    border-bottom:2px solid black;
   *  }
   *  .swap-animation.ng-enter, .swap-animation.ng-leave {
   *    transition:0.5s linear all;
   *  }
   *  .swap-animation.ng-enter {
   *    top:-250px;
   *  }
   *  .swap-animation.ng-enter-active {
   *    top:0px;
   *  }
   *  .swap-animation.ng-leave {
   *    top:0px;
   *  }
   *  .swap-animation.ng-leave-active {
   *    top:250px;
   *  }
   *  .red { background:red; }
   *  .green { background:green; }
   *  .blue { background:blue; }
   *  .yellow { background:yellow; }
   *  .orange { background:orange; }
   *  </file>
   * </example>
   */
  var ngAnimateSwapDirective = ['$animate', function($animate) {
    return {
      restrict: 'A',
      transclude: 'element',
      terminal: true,
      priority: 600, // we use 600 here to ensure that the directive is caught before others
      link: function(scope, $element, attrs, ctrl, $transclude) {
        var previousElement, previousScope;
        scope.$watchCollection(attrs.ngAnimateSwap || attrs['for'], function(value) {
          if (previousElement) {
            $animate.leave(previousElement);
          }
          if (previousScope) {
            previousScope.$destroy();
            previousScope = null;
          }
          if (value || value === 0) {
            $transclude(function(clone, childScope) {
              previousElement = clone;
              previousScope = childScope;
              $animate.enter(clone, null, $element);
            });
          }
        });
      }
    };
  }];
  
  /**
   * @ngdoc module
   * @name ngAnimate
   * @description
   *
   * The `ngAnimate` module provides support for CSS-based animations (keyframes and transitions) as well as JavaScript-based animations via
   * callback hooks. Animations are not enabled by default, however, by including `ngAnimate` the animation hooks are enabled for an AngularJS app.
   *
   * ## Usage
   * Simply put, there are two ways to make use of animations when ngAnimate is used: by using **CSS** and **JavaScript**. The former works purely based
   * using CSS (by using matching CSS selectors/styles) and the latter triggers animations that are registered via `module.animation()`. For
   * both CSS and JS animations the sole requirement is to have a matching `CSS class` that exists both in the registered animation and within
   * the HTML element that the animation will be triggered on.
   *
   * ## Directive Support
   * The following directives are "animation aware":
   *
   * | Directive                                                                     | Supported Animations                                                      |
   * |-------------------------------------------------------------------------------|---------------------------------------------------------------------------|
   * | {@link ng.directive:form#animations form / ngForm}                            | add and remove ({@link ng.directive:form#css-classes various classes})    |
   * | {@link ngAnimate.directive:ngAnimateSwap#animations ngAnimateSwap}            | enter and leave                                                           |
   * | {@link ng.directive:ngClass#animations ngClass / {{class&#125;&#8203;&#125;}  | add and remove                                                            |
   * | {@link ng.directive:ngClassEven#animations ngClassEven}                       | add and remove                                                            |
   * | {@link ng.directive:ngClassOdd#animations ngClassOdd}                         | add and remove                                                            |
   * | {@link ng.directive:ngHide#animations ngHide}                                 | add and remove (the `ng-hide` class)                                      |
   * | {@link ng.directive:ngIf#animations ngIf}                                     | enter and leave                                                           |
   * | {@link ng.directive:ngInclude#animations ngInclude}                           | enter and leave                                                           |
   * | {@link module:ngMessages#animations ngMessage / ngMessageExp}                 | enter and leave                                                           |
   * | {@link module:ngMessages#animations ngMessages}                               | add and remove (the `ng-active`/`ng-inactive` classes)                    |
   * | {@link ng.directive:ngModel#animations ngModel}                               | add and remove ({@link ng.directive:ngModel#css-classes various classes}) |
   * | {@link ng.directive:ngRepeat#animations ngRepeat}                             | enter, leave, and move                                                    |
   * | {@link ng.directive:ngShow#animations ngShow}                                 | add and remove (the `ng-hide` class)                                      |
   * | {@link ng.directive:ngSwitch#animations ngSwitch}                             | enter and leave                                                           |
   * | {@link ngRoute.directive:ngView#animations ngView}                            | enter and leave                                                           |
   *
   * (More information can be found by visiting the documentation associated with each directive.)
   *
   * For a full breakdown of the steps involved during each animation event, refer to the
   * {@link ng.$animate `$animate` API docs}.
   *
   * ## CSS-based Animations
   *
   * CSS-based animations with ngAnimate are unique since they require no JavaScript code at all. By using a CSS class that we reference between our HTML
   * and CSS code we can create an animation that will be picked up by AngularJS when an underlying directive performs an operation.
   *
   * The example below shows how an `enter` animation can be made possible on an element using `ng-if`:
   *
   * ```html
   * <div ng-if="bool" class="fade">
   *    Fade me in out
   * </div>
   * <button ng-click="bool=true">Fade In!</button>
   * <button ng-click="bool=false">Fade Out!</button>
   * ```
   *
   * Notice the CSS class **fade**? We can now create the CSS transition code that references this class:
   *
   * ```css
   * /&#42; The starting CSS styles for the enter animation &#42;/
   * .fade.ng-enter {
   *   transition:0.5s linear all;
   *   opacity:0;
   * }
   *
   * /&#42; The finishing CSS styles for the enter animation &#42;/
   * .fade.ng-enter.ng-enter-active {
   *   opacity:1;
   * }
   * ```
   *
   * The key thing to remember here is that, depending on the animation event (which each of the directives above trigger depending on what's going on) two
   * generated CSS classes will be applied to the element; in the example above we have `.ng-enter` and `.ng-enter-active`. For CSS transitions, the transition
   * code **must** be defined within the starting CSS class (in this case `.ng-enter`). The destination class is what the transition will animate towards.
   *
   * If for example we wanted to create animations for `leave` and `move` (ngRepeat triggers move) then we can do so using the same CSS naming conventions:
   *
   * ```css
   * /&#42; now the element will fade out before it is removed from the DOM &#42;/
   * .fade.ng-leave {
   *   transition:0.5s linear all;
   *   opacity:1;
   * }
   * .fade.ng-leave.ng-leave-active {
   *   opacity:0;
   * }
   * ```
   *
   * We can also make use of **CSS Keyframes** by referencing the keyframe animation within the starting CSS class:
   *
   * ```css
   * /&#42; there is no need to define anything inside of the destination
   * CSS class since the keyframe will take charge of the animation &#42;/
   * .fade.ng-leave {
   *   animation: my_fade_animation 0.5s linear;
   *   -webkit-animation: my_fade_animation 0.5s linear;
   * }
   *
   * @keyframes my_fade_animation {
   *   from { opacity:1; }
   *   to { opacity:0; }
   * }
   *
   * @-webkit-keyframes my_fade_animation {
   *   from { opacity:1; }
   *   to { opacity:0; }
   * }
   * ```
   *
   * Feel free also mix transitions and keyframes together as well as any other CSS classes on the same element.
   *
   * ### CSS Class-based Animations
   *
   * Class-based animations (animations that are triggered via `ngClass`, `ngShow`, `ngHide` and some other directives) have a slightly different
   * naming convention. Class-based animations are basic enough that a standard transition or keyframe can be referenced on the class being added
   * and removed.
   *
   * For example if we wanted to do a CSS animation for `ngHide` then we place an animation on the `.ng-hide` CSS class:
   *
   * ```html
   * <div ng-show="bool" class="fade">
   *   Show and hide me
   * </div>
   * <button ng-click="bool=!bool">Toggle</button>
   *
   * <style>
   * .fade.ng-hide {
   *   transition:0.5s linear all;
   *   opacity:0;
   * }
   * </style>
   * ```
   *
   * All that is going on here with ngShow/ngHide behind the scenes is the `.ng-hide` class is added/removed (when the hidden state is valid). Since
   * ngShow and ngHide are animation aware then we can match up a transition and ngAnimate handles the rest.
   *
   * In addition the addition and removal of the CSS class, ngAnimate also provides two helper methods that we can use to further decorate the animation
   * with CSS styles.
   *
   * ```html
   * <div ng-class="{on:onOff}" class="highlight">
   *   Highlight this box
   * </div>
   * <button ng-click="onOff=!onOff">Toggle</button>
   *
   * <style>
   * .highlight {
   *   transition:0.5s linear all;
   * }
   * .highlight.on-add {
   *   background:white;
   * }
   * .highlight.on {
   *   background:yellow;
   * }
   * .highlight.on-remove {
   *   background:black;
   * }
   * </style>
   * ```
   *
   * We can also make use of CSS keyframes by placing them within the CSS classes.
   *
   *
   * ### CSS Staggering Animations
   * A Staggering animation is a collection of animations that are issued with a slight delay in between each successive operation resulting in a
   * curtain-like effect. The ngAnimate module (versions >=1.2) supports staggering animations and the stagger effect can be
   * performed by creating a **ng-EVENT-stagger** CSS class and attaching that class to the base CSS class used for
   * the animation. The style property expected within the stagger class can either be a **transition-delay** or an
   * **animation-delay** property (or both if your animation contains both transitions and keyframe animations).
   *
   * ```css
   * .my-animation.ng-enter {
   *   /&#42; standard transition code &#42;/
   *   transition: 1s linear all;
   *   opacity:0;
   * }
   * .my-animation.ng-enter-stagger {
   *   /&#42; this will have a 100ms delay between each successive leave animation &#42;/
   *   transition-delay: 0.1s;
   *
   *   /&#42; As of 1.4.4, this must always be set: it signals ngAnimate
   *     to not accidentally inherit a delay property from another CSS class &#42;/
   *   transition-duration: 0s;
   *
   *   /&#42; if you are using animations instead of transitions you should configure as follows:
   *     animation-delay: 0.1s;
   *     animation-duration: 0s; &#42;/
   * }
   * .my-animation.ng-enter.ng-enter-active {
   *   /&#42; standard transition styles &#42;/
   *   opacity:1;
   * }
   * ```
   *
   * Staggering animations work by default in ngRepeat (so long as the CSS class is defined). Outside of ngRepeat, to use staggering animations
   * on your own, they can be triggered by firing multiple calls to the same event on $animate. However, the restrictions surrounding this
   * are that each of the elements must have the same CSS className value as well as the same parent element. A stagger operation
   * will also be reset if one or more animation frames have passed since the multiple calls to `$animate` were fired.
   *
   * The following code will issue the **ng-leave-stagger** event on the element provided:
   *
   * ```js
   * var kids = parent.children();
   *
   * $animate.leave(kids[0]); //stagger index=0
   * $animate.leave(kids[1]); //stagger index=1
   * $animate.leave(kids[2]); //stagger index=2
   * $animate.leave(kids[3]); //stagger index=3
   * $animate.leave(kids[4]); //stagger index=4
   *
   * window.requestAnimationFrame(function() {
   *   //stagger has reset itself
   *   $animate.leave(kids[5]); //stagger index=0
   *   $animate.leave(kids[6]); //stagger index=1
   *
   *   $scope.$digest();
   * });
   * ```
   *
   * Stagger animations are currently only supported within CSS-defined animations.
   *
   * ### The `ng-animate` CSS class
   *
   * When ngAnimate is animating an element it will apply the `ng-animate` CSS class to the element for the duration of the animation.
   * This is a temporary CSS class and it will be removed once the animation is over (for both JavaScript and CSS-based animations).
   *
   * Therefore, animations can be applied to an element using this temporary class directly via CSS.
   *
   * ```css
   * .zipper.ng-animate {
   *   transition:0.5s linear all;
   * }
   * .zipper.ng-enter {
   *   opacity:0;
   * }
   * .zipper.ng-enter.ng-enter-active {
   *   opacity:1;
   * }
   * .zipper.ng-leave {
   *   opacity:1;
   * }
   * .zipper.ng-leave.ng-leave-active {
   *   opacity:0;
   * }
   * ```
   *
   * (Note that the `ng-animate` CSS class is reserved and it cannot be applied on an element directly since ngAnimate will always remove
   * the CSS class once an animation has completed.)
   *
   *
   * ### The `ng-[event]-prepare` class
   *
   * This is a special class that can be used to prevent unwanted flickering / flash of content before
   * the actual animation starts. The class is added as soon as an animation is initialized, but removed
   * before the actual animation starts (after waiting for a $digest).
   * It is also only added for *structural* animations (`enter`, `move`, and `leave`).
   *
   * In practice, flickering can appear when nesting elements with structural animations such as `ngIf`
   * into elements that have class-based animations such as `ngClass`.
   *
   * ```html
   * <div ng-class="{red: myProp}">
   *   <div ng-class="{blue: myProp}">
   *     <div class="message" ng-if="myProp"></div>
   *   </div>
   * </div>
   * ```
   *
   * It is possible that during the `enter` animation, the `.message` div will be briefly visible before it starts animating.
   * In that case, you can add styles to the CSS that make sure the element stays hidden before the animation starts:
   *
   * ```css
   * .message.ng-enter-prepare {
   *   opacity: 0;
   * }
   * ```
   *
   * ### Animating between value changes
   *
   * Sometimes you need to animate between different expression states, whose values
   * don't necessary need to be known or referenced in CSS styles.
   * Unless possible with another {@link ngAnimate#directive-support "animation aware" directive},
   * that specific use case can always be covered with {@link ngAnimate.directive:ngAnimateSwap} as
   * can be seen in {@link ngAnimate.directive:ngAnimateSwap#examples this example}.
   *
   * Note that {@link ngAnimate.directive:ngAnimateSwap} is a *structural directive*, which means it
   * creates a new instance of the element (including any other/child directives it may have) and
   * links it to a new scope every time *swap* happens. In some cases this might not be desirable
   * (e.g. for performance reasons, or when you wish to retain internal state on the original
   * element instance).
   *
   * ## JavaScript-based Animations
   *
   * ngAnimate also allows for animations to be consumed by JavaScript code. The approach is similar to CSS-based animations (where there is a shared
   * CSS class that is referenced in our HTML code) but in addition we need to register the JavaScript animation on the module. By making use of the
   * `module.animation()` module function we can register the animation.
   *
   * Let's see an example of a enter/leave animation using `ngRepeat`:
   *
   * ```html
   * <div ng-repeat="item in items" class="slide">
   *   {{ item }}
   * </div>
   * ```
   *
   * See the **slide** CSS class? Let's use that class to define an animation that we'll structure in our module code by using `module.animation`:
   *
   * ```js
   * myModule.animation('.slide', [function() {
   *   return {
   *     // make note that other events (like addClass/removeClass)
   *     // have different function input parameters
   *     enter: function(element, doneFn) {
   *       jQuery(element).fadeIn(1000, doneFn);
   *
   *       // remember to call doneFn so that AngularJS
   *       // knows that the animation has concluded
   *     },
   *
   *     move: function(element, doneFn) {
   *       jQuery(element).fadeIn(1000, doneFn);
   *     },
   *
   *     leave: function(element, doneFn) {
   *       jQuery(element).fadeOut(1000, doneFn);
   *     }
   *   }
   * }]);
   * ```
   *
   * The nice thing about JS-based animations is that we can inject other services and make use of advanced animation libraries such as
   * greensock.js and velocity.js.
   *
   * If our animation code class-based (meaning that something like `ngClass`, `ngHide` and `ngShow` triggers it) then we can still define
   * our animations inside of the same registered animation, however, the function input arguments are a bit different:
   *
   * ```html
   * <div ng-class="color" class="colorful">
   *   this box is moody
   * </div>
   * <button ng-click="color='red'">Change to red</button>
   * <button ng-click="color='blue'">Change to blue</button>
   * <button ng-click="color='green'">Change to green</button>
   * ```
   *
   * ```js
   * myModule.animation('.colorful', [function() {
   *   return {
   *     addClass: function(element, className, doneFn) {
   *       // do some cool animation and call the doneFn
   *     },
   *     removeClass: function(element, className, doneFn) {
   *       // do some cool animation and call the doneFn
   *     },
   *     setClass: function(element, addedClass, removedClass, doneFn) {
   *       // do some cool animation and call the doneFn
   *     }
   *   }
   * }]);
   * ```
   *
   * ## CSS + JS Animations Together
   *
   * AngularJS 1.4 and higher has taken steps to make the amalgamation of CSS and JS animations more flexible. However, unlike earlier versions of AngularJS,
   * defining CSS and JS animations to work off of the same CSS class will not work anymore. Therefore the example below will only result in **JS animations taking
   * charge of the animation**:
   *
   * ```html
   * <div ng-if="bool" class="slide">
   *   Slide in and out
   * </div>
   * ```
   *
   * ```js
   * myModule.animation('.slide', [function() {
   *   return {
   *     enter: function(element, doneFn) {
   *       jQuery(element).slideIn(1000, doneFn);
   *     }
   *   }
   * }]);
   * ```
   *
   * ```css
   * .slide.ng-enter {
   *   transition:0.5s linear all;
   *   transform:translateY(-100px);
   * }
   * .slide.ng-enter.ng-enter-active {
   *   transform:translateY(0);
   * }
   * ```
   *
   * Does this mean that CSS and JS animations cannot be used together? Do JS-based animations always have higher priority? We can make up for the
   * lack of CSS animations by using the `$animateCss` service to trigger our own tweaked-out, CSS-based animations directly from
   * our own JS-based animation code:
   *
   * ```js
   * myModule.animation('.slide', ['$animateCss', function($animateCss) {
   *   return {
   *     enter: function(element) {
  *        // this will trigger `.slide.ng-enter` and `.slide.ng-enter-active`.
   *       return $animateCss(element, {
   *         event: 'enter',
   *         structural: true
   *       });
   *     }
   *   }
   * }]);
   * ```
   *
   * The nice thing here is that we can save bandwidth by sticking to our CSS-based animation code and we don't need to rely on a 3rd-party animation framework.
   *
   * The `$animateCss` service is very powerful since we can feed in all kinds of extra properties that will be evaluated and fed into a CSS transition or
   * keyframe animation. For example if we wanted to animate the height of an element while adding and removing classes then we can do so by providing that
   * data into `$animateCss` directly:
   *
   * ```js
   * myModule.animation('.slide', ['$animateCss', function($animateCss) {
   *   return {
   *     enter: function(element) {
   *       return $animateCss(element, {
   *         event: 'enter',
   *         structural: true,
   *         addClass: 'maroon-setting',
   *         from: { height:0 },
   *         to: { height: 200 }
   *       });
   *     }
   *   }
   * }]);
   * ```
   *
   * Now we can fill in the rest via our transition CSS code:
   *
   * ```css
   * /&#42; the transition tells ngAnimate to make the animation happen &#42;/
   * .slide.ng-enter { transition:0.5s linear all; }
   *
   * /&#42; this extra CSS class will be absorbed into the transition
   * since the $animateCss code is adding the class &#42;/
   * .maroon-setting { background:red; }
   * ```
   *
   * And `$animateCss` will figure out the rest. Just make sure to have the `done()` callback fire the `doneFn` function to signal when the animation is over.
   *
   * To learn more about what's possible be sure to visit the {@link ngAnimate.$animateCss $animateCss service}.
   *
   * ## Animation Anchoring (via `ng-animate-ref`)
   *
   * ngAnimate in AngularJS 1.4 comes packed with the ability to cross-animate elements between
   * structural areas of an application (like views) by pairing up elements using an attribute
   * called `ng-animate-ref`.
   *
   * Let's say for example we have two views that are managed by `ng-view` and we want to show
   * that there is a relationship between two components situated in within these views. By using the
   * `ng-animate-ref` attribute we can identify that the two components are paired together and we
   * can then attach an animation, which is triggered when the view changes.
   *
   * Say for example we have the following template code:
   *
   * ```html
   * <!-- index.html -->
   * <div ng-view class="view-animation">
   * </div>
   *
   * <!-- home.html -->
   * <a href="#/banner-page">
   *   <img src="./banner.jpg" class="banner" ng-animate-ref="banner">
   * </a>
   *
   * <!-- banner-page.html -->
   * <img src="./banner.jpg" class="banner" ng-animate-ref="banner">
   * ```
   *
   * Now, when the view changes (once the link is clicked), ngAnimate will examine the
   * HTML contents to see if there is a match reference between any components in the view
   * that is leaving and the view that is entering. It will scan both the view which is being
   * removed (leave) and inserted (enter) to see if there are any paired DOM elements that
   * contain a matching ref value.
   *
   * The two images match since they share the same ref value. ngAnimate will now create a
   * transport element (which is a clone of the first image element) and it will then attempt
   * to animate to the position of the second image element in the next view. For the animation to
   * work a special CSS class called `ng-anchor` will be added to the transported element.
   *
   * We can now attach a transition onto the `.banner.ng-anchor` CSS class and then
   * ngAnimate will handle the entire transition for us as well as the addition and removal of
   * any changes of CSS classes between the elements:
   *
   * ```css
   * .banner.ng-anchor {
   *   /&#42; this animation will last for 1 second since there are
   *          two phases to the animation (an `in` and an `out` phase) &#42;/
   *   transition:0.5s linear all;
   * }
   * ```
   *
   * We also **must** include animations for the views that are being entered and removed
   * (otherwise anchoring wouldn't be possible since the new view would be inserted right away).
   *
   * ```css
   * .view-animation.ng-enter, .view-animation.ng-leave {
   *   transition:0.5s linear all;
   *   position:fixed;
   *   left:0;
   *   top:0;
   *   width:100%;
   * }
   * .view-animation.ng-enter {
   *   transform:translateX(100%);
   * }
   * .view-animation.ng-leave,
   * .view-animation.ng-enter.ng-enter-active {
   *   transform:translateX(0%);
   * }
   * .view-animation.ng-leave.ng-leave-active {
   *   transform:translateX(-100%);
   * }
   * ```
   *
   * Now we can jump back to the anchor animation. When the animation happens, there are two stages that occur:
   * an `out` and an `in` stage. The `out` stage happens first and that is when the element is animated away
   * from its origin. Once that animation is over then the `in` stage occurs which animates the
   * element to its destination. The reason why there are two animations is to give enough time
   * for the enter animation on the new element to be ready.
   *
   * The example above sets up a transition for both the in and out phases, but we can also target the out or
   * in phases directly via `ng-anchor-out` and `ng-anchor-in`.
   *
   * ```css
   * .banner.ng-anchor-out {
   *   transition: 0.5s linear all;
   *
   *   /&#42; the scale will be applied during the out animation,
   *          but will be animated away when the in animation runs &#42;/
   *   transform: scale(1.2);
   * }
   *
   * .banner.ng-anchor-in {
   *   transition: 1s linear all;
   * }
   * ```
   *
   *
   *
   *
   * ### Anchoring Demo
   *
    <example module="anchoringExample"
             name="anchoringExample"
             id="anchoringExample"
             deps="angular-animate.js;angular-route.js"
             animations="true">
      <file name="index.html">
        <a href="#!/">Home</a>
        <hr />
        <div class="view-container">
          <div ng-view class="view"></div>
        </div>
      </file>
      <file name="script.js">
        angular.module('anchoringExample', ['ngAnimate', 'ngRoute'])
          .config(['$routeProvider', function($routeProvider) {
            $routeProvider.when('/', {
              templateUrl: 'home.html',
              controller: 'HomeController as home'
            });
            $routeProvider.when('/profile/:id', {
              templateUrl: 'profile.html',
              controller: 'ProfileController as profile'
            });
          }])
          .run(['$rootScope', function($rootScope) {
            $rootScope.records = [
              { id: 1, title: 'Miss Beulah Roob' },
              { id: 2, title: 'Trent Morissette' },
              { id: 3, title: 'Miss Ava Pouros' },
              { id: 4, title: 'Rod Pouros' },
              { id: 5, title: 'Abdul Rice' },
              { id: 6, title: 'Laurie Rutherford Sr.' },
              { id: 7, title: 'Nakia McLaughlin' },
              { id: 8, title: 'Jordon Blanda DVM' },
              { id: 9, title: 'Rhoda Hand' },
              { id: 10, title: 'Alexandrea Sauer' }
            ];
          }])
          .controller('HomeController', [function() {
            //empty
          }])
          .controller('ProfileController', ['$rootScope', '$routeParams',
              function ProfileController($rootScope, $routeParams) {
            var index = parseInt($routeParams.id, 10);
            var record = $rootScope.records[index - 1];
  
            this.title = record.title;
            this.id = record.id;
          }]);
      </file>
      <file name="home.html">
        <h2>Welcome to the home page</h1>
        <p>Please click on an element</p>
        <a class="record"
           ng-href="#!/profile/{{ record.id }}"
           ng-animate-ref="{{ record.id }}"
           ng-repeat="record in records">
          {{ record.title }}
        </a>
      </file>
      <file name="profile.html">
        <div class="profile record" ng-animate-ref="{{ profile.id }}">
          {{ profile.title }}
        </div>
      </file>
      <file name="animations.css">
        .record {
          display:block;
          font-size:20px;
        }
        .profile {
          background:black;
          color:white;
          font-size:100px;
        }
        .view-container {
          position:relative;
        }
        .view-container > .view.ng-animate {
          position:absolute;
          top:0;
          left:0;
          width:100%;
          min-height:500px;
        }
        .view.ng-enter, .view.ng-leave,
        .record.ng-anchor {
          transition:0.5s linear all;
        }
        .view.ng-enter {
          transform:translateX(100%);
        }
        .view.ng-enter.ng-enter-active, .view.ng-leave {
          transform:translateX(0%);
        }
        .view.ng-leave.ng-leave-active {
          transform:translateX(-100%);
        }
        .record.ng-anchor-out {
          background:red;
        }
      </file>
    </example>
   *
   * ### How is the element transported?
   *
   * When an anchor animation occurs, ngAnimate will clone the starting element and position it exactly where the starting
   * element is located on screen via absolute positioning. The cloned element will be placed inside of the root element
   * of the application (where ng-app was defined) and all of the CSS classes of the starting element will be applied. The
   * element will then animate into the `out` and `in` animations and will eventually reach the coordinates and match
   * the dimensions of the destination element. During the entire animation a CSS class of `.ng-animate-shim` will be applied
   * to both the starting and destination elements in order to hide them from being visible (the CSS styling for the class
   * is: `visibility:hidden`). Once the anchor reaches its destination then it will be removed and the destination element
   * will become visible since the shim class will be removed.
   *
   * ### How is the morphing handled?
   *
   * CSS Anchoring relies on transitions and keyframes and the internal code is intelligent enough to figure out
   * what CSS classes differ between the starting element and the destination element. These different CSS classes
   * will be added/removed on the anchor element and a transition will be applied (the transition that is provided
   * in the anchor class). Long story short, ngAnimate will figure out what classes to add and remove which will
   * make the transition of the element as smooth and automatic as possible. Be sure to use simple CSS classes that
   * do not rely on DOM nesting structure so that the anchor element appears the same as the starting element (since
   * the cloned element is placed inside of root element which is likely close to the body element).
   *
   * Note that if the root element is on the `<html>` element then the cloned node will be placed inside of body.
   *
   *
   * ## Using $animate in your directive code
   *
   * So far we've explored how to feed in animations into an AngularJS application, but how do we trigger animations within our own directives in our application?
   * By injecting the `$animate` service into our directive code, we can trigger structural and class-based hooks which can then be consumed by animations. Let's
   * imagine we have a greeting box that shows and hides itself when the data changes
   *
   * ```html
   * <greeting-box active="onOrOff">Hi there</greeting-box>
   * ```
   *
   * ```js
   * ngModule.directive('greetingBox', ['$animate', function($animate) {
   *   return function(scope, element, attrs) {
   *     attrs.$observe('active', function(value) {
   *       value ? $animate.addClass(element, 'on') : $animate.removeClass(element, 'on');
   *     });
   *   });
   * }]);
   * ```
   *
   * Now the `on` CSS class is added and removed on the greeting box component. Now if we add a CSS class on top of the greeting box element
   * in our HTML code then we can trigger a CSS or JS animation to happen.
   *
   * ```css
   * /&#42; normally we would create a CSS class to reference on the element &#42;/
   * greeting-box.on { transition:0.5s linear all; background:green; color:white; }
   * ```
   *
   * The `$animate` service contains a variety of other methods like `enter`, `leave`, `animate` and `setClass`. To learn more about what's
   * possible be sure to visit the {@link ng.$animate $animate service API page}.
   *
   *
   * ## Callbacks and Promises
   *
   * When `$animate` is called it returns a promise that can be used to capture when the animation has ended. Therefore if we were to trigger
   * an animation (within our directive code) then we can continue performing directive and scope related activities after the animation has
   * ended by chaining onto the returned promise that animation method returns.
   *
   * ```js
   * // somewhere within the depths of the directive
   * $animate.enter(element, parent).then(function() {
   *   //the animation has completed
   * });
   * ```
   *
   * (Note that earlier versions of AngularJS prior to v1.4 required the promise code to be wrapped using `$scope.$apply(...)`. This is not the case
   * anymore.)
   *
   * In addition to the animation promise, we can also make use of animation-related callbacks within our directives and controller code by registering
   * an event listener using the `$animate` service. Let's say for example that an animation was triggered on our view
   * routing controller to hook into that:
   *
   * ```js
   * ngModule.controller('HomePageController', ['$animate', function($animate) {
   *   $animate.on('enter', ngViewElement, function(element) {
   *     // the animation for this route has completed
   *   }]);
   * }])
   * ```
   *
   * (Note that you will need to trigger a digest within the callback to get AngularJS to notice any scope-related changes.)
   */
  
  var copy;
  var extend;
  var forEach;
  var isArray;
  var isDefined;
  var isElement;
  var isFunction;
  var isObject;
  var isString;
  var isUndefined;
  var jqLite;
  var noop;
  
  /**
   * @ngdoc service
   * @name $animate
   * @kind object
   *
   * @description
   * The ngAnimate `$animate` service documentation is the same for the core `$animate` service.
   *
   * Click here {@link ng.$animate to learn more about animations with `$animate`}.
   */
  angular.module('ngAnimate', [], function initAngularHelpers() {
    // Access helpers from AngularJS core.
    // Do it inside a `config` block to ensure `window.angular` is available.
    noop        = angular.noop;
    copy        = angular.copy;
    extend      = angular.extend;
    jqLite      = angular.element;
    forEach     = angular.forEach;
    isArray     = angular.isArray;
    isString    = angular.isString;
    isObject    = angular.isObject;
    isUndefined = angular.isUndefined;
    isDefined   = angular.isDefined;
    isFunction  = angular.isFunction;
    isElement   = angular.isElement;
  })
    .info({ angularVersion: '1.7.5' })
    .directive('ngAnimateSwap', ngAnimateSwapDirective)
  
    .directive('ngAnimateChildren', $$AnimateChildrenDirective)
    .factory('$$rAFScheduler', $$rAFSchedulerFactory)
  
    .provider('$$animateQueue', $$AnimateQueueProvider)
    .provider('$$animateCache', $$AnimateCacheProvider)
    .provider('$$animation', $$AnimationProvider)
  
    .provider('$animateCss', $AnimateCssProvider)
    .provider('$$animateCssDriver', $$AnimateCssDriverProvider)
  
    .provider('$$animateJs', $$AnimateJsProvider)
    .provider('$$animateJsDriver', $$AnimateJsDriverProvider);
  
  
  })(window, window.angular);
  