text: /**
   * @license AngularJS v1.7.10-build.26922+sha.123c5a0
   * (c) 2010-2020 Google, Inc. http://angularjs.org
   * License: MIT
   */
  (function(window, angular) {'use strict';
  
      const ELEMENT_NODE = 1;
      // var COMMENT_NODE = 8;
  
      const 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 implement `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 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 helpers = {
          blockTransitions: function(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];
          }
      };
  
      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) {
                          helpers.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) {
                          helpers.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);
                          helpers.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) {
                              helpers.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: 550, // We use 550 here to ensure that the directive is caught before others,
                             // but after `ngIf` (at priority 600).
              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: '1.7.10-build.26922+sha.123c5a0' })
          .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);
  