/**

* @license AngularJS v1.5.3
* (c) 2010-2016 Google, Inc. http://angularjs.org
* License: MIT
*/

(function(window, angular, undefined) {'use strict';

/* jshint ignore:start */ var noop = angular.noop; var copy = angular.copy; var extend = angular.extend; var jqLite = angular.element; var forEach = angular.forEach; var isArray = angular.isArray; var isString = angular.isString; var isObject = angular.isObject; var isUndefined = angular.isUndefined; var isDefined = angular.isDefined; var isFunction = angular.isFunction; var isElement = angular.isElement;

var ELEMENT_NODE = 1; var COMMENT_NODE = 8;

var ADD_CLASS_SUFFIX = '-add'; var REMOVE_CLASS_SUFFIX = '-remove'; var EVENT_CLASS_PREFIX = 'ng-'; var ACTIVE_CLASS_SUFFIX = '-active'; var PREPARE_CLASS_SUFFIX = '-prepare';

var NG_ANIMATE_CLASSNAME = 'ng-animate'; var NG_ANIMATE_CHILDREN_DATA = '$$ngAnimateChildren';

// Detect proper transitionend/animationend event names. var CSS_PREFIX = '', TRANSITION_PROP, TRANSITIONEND_EVENT, ANIMATION_PROP, ANIMATIONEND_EVENT;

// If unprefixed events are not supported but webkit-prefixed are, use the latter. // Otherwise, just use W3C names, browsers not supporting them at all will just ignore them. // Note: Chrome implements `window.onwebkitanimationend` and doesn't 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: // caniuse.com/#search=transition if (isUndefined(window.ontransitionend) && isDefined(window.onwebkittransitionend)) {

CSS_PREFIX = '-webkit-';
TRANSITION_PROP = 'WebkitTransition';
TRANSITIONEND_EVENT = 'webkitTransitionEnd transitionend';

} else {

TRANSITION_PROP = 'transition';
TRANSITIONEND_EVENT = 'transitionend';

}

if (isUndefined(window.onanimationend) && isDefined(window.onwebkitanimationend)) {

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 isPromiseLike = function(p) {

return p && p.then ? true : false;

};

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 [];
      break;

    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));
      break;
  }
}

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];
  } else if (val === REMOVE_CLASS) {
    prop = 'removeClass';
    allow = existing[klass];
  }
  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 angular.element) ? element[0] : element;

}

function applyGeneratedPreparationClasses(element, event, options) {

var classes = '';
if (event) {
  classes = pendClasses(event, EVENT_CLASS_PREFIX, true);
}
if (options.addClass) {
  classes = concatWithSpace(classes, pendClasses(options.addClass, ADD_CLASS_SUFFIX));
}
if (options.removeClass) {
  classes = concatWithSpace(classes, pendClasses(options.removeClass, REMOVE_CLASS_SUFFIX));
}
if (classes.length) {
  options.preparationClasses = classes;
  element.addClass(classes);
}

}

function clearGeneratedClasses(element, options) {

if (options.preparationClasses) {
  element.removeClass(options.preparationClasses);
  options.preparationClasses = null;
}
if (options.activeClasses) {
  element.removeClass(options.activeClasses);
  options.activeClasses = null;
}

}

function blockTransitions(node, duration) {

// we use a negative delay value since it performs blocking
// yet it doesn't kill any existing transitions running on the
// same element which makes this safe for class-based animations
var value = duration ? '-' + duration + 's' : '';
applyInlineStyle(node, [TRANSITION_DELAY_PROP, value]);
return [TRANSITION_DELAY_PROP, value];

}

function blockKeyframeAnimations(node, applyBlock) {

var value = applyBlock ? 'paused' : '';
var key = ANIMATION_PROP + ANIMATION_PLAYSTATE_KEY;
applyInlineStyle(node, [key, value]);
return [key, value];

}

function applyInlineStyle(node, styleTuple) {

var prop = styleTuple[0];
var value = styleTuple[1];
node.style[prop] = value;

}

function concatWithSpace(a,b) {

if (!a) return b;
if (!b) return a;
return a + ' ' + b;

}

var $$rAFSchedulerFactory = ['$$rAF', function($$rAF) {

var queue, cancelFn;

function scheduler(tasks) {
  // we make a copy since RAFScheduler mutates the state
  // of the passed in array variable and this would be difficult
  // to track down on the outside code
  queue = queue.concat(tasks);
  nextTick();
}

queue = scheduler.queue = [];

/* waitUntilQuiet does two things:
 * 1. It will run the FINAL `fn` value only when an uncanceled RAF has passed through
 * 2. It will delay the next wave of tasks from running until the quiet `fn` has run.
 *
 * The motivation here is that animation code can request more time from the scheduler
 * before the next wave runs. This allows for certain DOM properties such as classes to
 * be resolved in time for the next animation to run.
 */
scheduler.waitUntilQuiet = function(fn) {
  if (cancelFn) cancelFn();

  cancelFn = $$rAF(function() {
    cancelFn = null;
    fn();
    nextTick();
  });
};

return scheduler;

function nextTick() {
  if (!queue.length) return;

  var items = queue.shift();
  for (var i = 0; i < items.length; i++) {
    items[i]();
  }

  if (!cancelFn) {
    $$rAF(function() {
      if (!cancelFn) nextTick();
    });
  }
}

}];

/**

* @ngdoc directive
* @name ngAnimateChildren
* @restrict AE
* @element ANY
*
* @description
*
* ngAnimateChildren allows you to specify that children of this element should animate even if any
* of the children's parents are currently animating. By default, when an element has an active `enter`, `leave`, or `move`
* (structural) animation, child elements that also have an active structural animation are not animated.
*
* Note that even if `ngAnimteChildren` 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() {
         this.animateChildren = false;
         this.enterElement = false;
       });
   </file>
 </example>
*/

var $$AnimateChildrenDirective = ['$interpolate', function($interpolate) {

return {
  link: function(scope, element, attrs) {
    var val = attrs.ngAnimateChildren;
    if (angular.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);
    }
  }
};

}];

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 `$animateCss` (bad news for IE9 and lower).
*
* ## Usage
* Once again, `$animateCss` is designed to be used inside of a registered JavaScript animation that
* is powered by ngAnimate. It is possible to use `$animateCss` directly inside of a directive, however,
* any automatic control over cancelling animations and/or preventing animations from being run on
* child elements will not be handled by Angular. For this to work as expected, please use `$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 BASE_TEN = 10;

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];

}

function createLocalCacheLookup() {

var cache = Object.create(null);
return {
  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) {
    if (!cache[key]) {
      cache[key] = { total: 1, value: value };
    } else {
      cache[key].total++;
    }
  }
};

}

// 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 // β€œOR” 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', function($animateProvider) {

var gcsLookup = createLocalCacheLookup();
var gcsStaggerLookup = createLocalCacheLookup();

this.$get = ['$window', '$$jqLite', '$$AnimateRunner', '$timeout',
             '$$forceReflow', '$sniffer', '$$rAFScheduler', '$$animateQueue',
     function($window,   $$jqLite,   $$AnimateRunner,   $timeout,
              $$forceReflow,   $sniffer,   $$rAFScheduler, $$animateQueue) {

  var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);

  var parentCounter = 0;
  function gcsHashFn(node, extraClasses) {
    var KEY = "$$ngAnimateParentKey";
    var parentNode = node.parentNode;
    var parentID = parentNode[KEY] || (parentNode[KEY] = ++parentCounter);
    return parentID + '-' + node.getAttribute('class') + '-' + extraClasses;
  }

  function computeCachedCssStyles(node, className, cacheKey, properties) {
    var timings = gcsLookup.get(cacheKey);

    if (!timings) {
      timings = computeCssStyles($window, node, properties);
      if (timings.animationIterationCount === 'infinite') {
        timings.animationIterationCount = 1;
      }
    }

    // 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.
    gcsLookup.put(cacheKey, timings);
    return timings;
  }

  function computeCachedCssStaggerStyles(node, className, cacheKey, properties) {
    var stagger;

    // 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 (gcsLookup.count(cacheKey) > 0) {
      stagger = gcsStaggerLookup.get(cacheKey);

      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);

        gcsStaggerLookup.put(cacheKey, stagger);
      }
    }

    return stagger || {};
  }

  var cancelLastRAFRequest;
  var rafWaitQueue = [];
  function waitUntilQuiet(callback) {
    rafWaitQueue.push(callback);
    $$rAFScheduler.waitUntilQuiet(function() {
      gcsLookup.flush();
      gcsStaggerLookup.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) {
    var timings = computeCachedCssStyles(node, className, cacheKey, 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 activeClasses = pendClasses(preparationClasses, ACTIVE_CLASS_SUFFIX);
    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 cacheKey, stagger;
    if (options.stagger > 0) {
      var staggerVal = parseFloat(options.stagger);
      stagger = {
        transitionDelay: staggerVal,
        animationDelay: staggerVal,
        transitionDuration: 0,
        animationDuration: 0
      };
    } else {
      cacheKey = gcsHashFn(node, fullClassName);
      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
            : gcsLookup.count(cacheKey)
        : 0;

    var isFirst = itemIndex === 0;

    // this is a pre-emptive way of forcing the setup classes to be added and applied INSTANTLY
    // without causing any combination of transitions to kick in. By adding a negative delay value
    // it forces the setup class' transition to end immediately. We later then remove the negative
    // transition delay to allow for the transition to naturally do it's thing. The beauty here is
    // that if there is no transition defined then nothing will happen and this will also allow
    // other transitions to be stacked on top of each other without any chopping them out.
    if (isFirst && !options.skipBlocking) {
      blockTransitions(node, SAFE_FAST_FORWARD_DURATION_VALUE);
    }

    var timings = computeTimings(node, fullClassName, cacheKey);
    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();
    }

    if (options.delay != null) {
      var delayStyle;
      if (typeof options.delay !== "boolean") {
        delayStyle = parseFloat(options.delay);
        // number in options.delay means we have to recalculate the delay for the closing timeout
        maxDelay = Math.max(delayStyle, 0);
      }

      if (flags.applyTransitionDelay) {
        temporaryStyles.push(getCssDelayStyle(delayStyle));
      }

      if (flags.applyAnimationDelay) {
        temporaryStyles.push(getCssDelayStyle(delayStyle, true));
      }
    }

    // we need to recalculate the delay value since we used a pre-emptive negative
    // delay value and the delay value is required for the final event checking. This
    // property will ensure that this will happen after the RAF phase has passed.
    if (options.duration == null && timings.transitionDuration > 0) {
      flags.recalculateTimingStyles = flags.recalculateTimingStyles || isFirst;
    }

    maxDelayTime = maxDelay * ONE_SECOND;
    maxDurationTime = maxDuration * ONE_SECOND;
    if (!options.skipBlocking) {
      flags.blockTransition = timings.transitionDuration > 0;
      flags.blockKeyframeAnimation = timings.animationDuration > 0 &&
                                     stagger.animationDelay > 0 &&
                                     stagger.animationDuration === 0;
    }

    if (options.from) {
      if (options.cleanupStyles) {
        registerRestorableStyles(restoreStyles, node, Object.keys(options.from));
      }
      applyAnimationFromStyles(element, options);
    }

    if (flags.blockTransition || flags.blockKeyframeAnimation) {
      applyBlocking(maxDuration);
    } else if (!options.skipBlocking) {
      blockTransitions(node, false);
    }

    // TODO(matsko): for 1.5 change this code to have an animator object for better debugging
    return {
      $$willAnimate: true,
      end: endFn,
      start: function() {
        if (animationClosed) return;

        runnerHost = {
          end: endFn,
          cancel: cancelFn,
          resume: null, //this will be set during the start() phase
          pause: null
        };

        runner = new $$AnimateRunner(runnerHost);

        waitUntilQuiet(start);

        // we don't have access to pause/resume the animation
        // since it hasn't run yet. AnimateRunner will therefore
        // set noop functions for resume and pause and they will
        // later be overridden once the animation is triggered
        return runner;
      }
    };

    function endFn() {
      close();
    }

    function cancelFn() {
      close(true);
    }

    function close(rejected) { // jshint ignore:line
      // 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 (!options.$$skipPreparationClasses) {
        $$jqLite.removeClass(element, preparationClasses);
      }
      $$jqLite.removeClass(element, activeClasses);

      blockKeyframeAnimations(node, false);
      blockTransitions(node, false);

      forEach(temporaryStyles, function(entry) {
        // There is only one way to remove inline style properties entirely from elements.
        // By using `removeProperty` this works, but we need to convert camel-cased CSS
        // styles down to hyphenated values.
        node.style[entry[0]] = '';
      });

      applyAnimationClasses(element, options);
      applyAnimationStyles(element, options);

      if (Object.keys(restoreStyles).length) {
        forEach(restoreStyles, function(value, prop) {
          value ? node.style.setProperty(prop, value)
                : node.style.removeProperty(prop);
        });
      }

      // the reason why we have this option is to allow a synchronous closing callback
      // that is fired as SOON as the animation ends (when the CSS is removed) or if
      // the animation never takes off at all. A good example is a leave animation since
      // the element must be removed just after the animation is over or else the element
      // will appear on screen for one animation frame causing an overbearing flicker.
      if (options.onDone) {
        options.onDone();
      }

      if (events && events.length) {
        // Remove the transitionend / animationend listener(s)
        element.off(events.join(' '), onAnimationProgress);
      }

      //Cancel the fallback closing timeout and remove the timer data
      var animationTimerData = element.data(ANIMATE_TIMER_KEY);
      if (animationTimerData) {
        $timeout.cancel(animationTimerData[0].timer);
        element.removeData(ANIMATE_TIMER_KEY);
      }

      // if the preparation function fails then the promise is not setup
      if (runner) {
        runner.complete(!rejected);
      }
    }

    function applyBlocking(duration) {
      if (flags.blockTransition) {
        blockTransitions(node, duration);
      }

      if (flags.blockKeyframeAnimation) {
        blockKeyframeAnimations(node, !!duration);
      }
    }

    function closeAndReturnNoopAnimator() {
      runner = new $$AnimateRunner({
        end: endFn,
        cancel: cancelFn
      });

      // should flush the cache animation
      waitUntilQuiet(noop);
      close();

      return {
        $$willAnimate: false,
        start: function() {
          return runner;
        },
        end: endFn
      };
    }

    function onAnimationProgress(event) {
      event.stopPropagation();
      var ev = event.originalEvent || event;

      // 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);
            animationPaused
                ? temporaryStyles.push(value)
                : 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.className + ' ' + preparationClasses;
          cacheKey = gcsHashFn(node, fullClassName);

          timings = computeTimings(node, fullClassName, cacheKey);
          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', 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
  );

  var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);

  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 = ['$animateProvider', function($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());
          });
        }

        runners.length ? $$AnimateRunner.all(runners, callback) : callback();

        return function endFn(reject) {
          forEach(runners, function(runner) {
            reject ? runner.cancel() : 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', 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 = ['$animateProvider', function($animateProvider) {

var PRE_DIGEST_STATE = 1;
var RUNNING_STATE = 2;
var ONE_SPACE = ' ';

var rules = this.rules = {
  skip: [],
  cancel: [],
  join: []
};

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, element, currentAnimation, previousAnimation) {
  return rules[ruleType].some(function(fn) {
    return fn(element, 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(element, 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(element, 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(element, 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(element, 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(element, newAnimation, currentAnimation) {
  // there can never be two structural animations running at the same time
  return currentAnimation.structural && newAnimation.structural;
});

rules.cancel.push(function(element, 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(element, 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 = ['$$rAF', '$rootScope', '$rootElement', '$document', '$$HashMap',
             '$$animation', '$$AnimateRunner', '$templateRequest', '$$jqLite', '$$forceReflow',
     function($$rAF,   $rootScope,   $rootElement,   $document,   $$HashMap,
              $$animation,   $$AnimateRunner,   $templateRequest,   $$jqLite,   $$forceReflow) {

  var activeAnimationsLookup = new $$HashMap();
  var disabledElementsLookup = new $$HashMap();
  var animationsEnabled = null;

  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 = {};

  // remember that the classNameFilter is set during the provider/config
  // stage therefore we can optimize here and setup a helper function
  var classNameFilter = $animateProvider.classNameFilter();
  var isAnimatableClassName = !classNameFilter
            ? function() { return true; }
            : function(className) {
              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 = Node.prototype.contains || function(arg) {
    // jshint bitwise: false
    return this === arg || !!(this.compareDocumentPosition(arg) & 16);
    // jshint bitwise: true
  };

  function findCallbacks(parent, element, event) {
    var targetNode = getDomNode(element);
    var targetParentNode = getDomNode(parent);

    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;
  }

  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() {
        $animate.off(event, container, callback);
      });
    },

    off: function(event, container, callback) {
      var entries = callbackRegistry[event];
      if (!entries) return;

      callbackRegistry[event] = arguments.length === 1
          ? null
          : filterFromRegistry(entries, container, callback);

      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;
        });
      }
    },

    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);
          var recordExists = disabledElementsLookup.get(node);

          if (argCount === 1) {
            // (element) - Element getter
            bool = !recordExists;
          } else {
            // (element, bool) - Element setter
            disabledElementsLookup.put(node, !bool);
          }
        }
      }

      return bool;
    }
  };

  return $animate;

  function queueAnimation(element, 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 node, parent;
    element = stripCommentsFromElement(element);
    if (element) {
      node = getDomNode(element);
      parent = element.parent();
    }

    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;
    }

    // there are situations where a directive issues an animation for
    // a jqLite wrapper that contains only comment nodes... If this
    // happens then there is no way we can perform an animation
    if (!node) {
      close();
      return runner;
    }

    var className = [node.className, options.addClass, options.removeClass].join(' ');
    if (!isAnimatableClassName(className)) {
      close();
      return runner;
    }

    var isStructural = ['enter', 'move', 'leave'].indexOf(event) >= 0;

    // this is a hard disable of all animations for the application or on
    // 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 = !animationsEnabled || $document[0].hidden || 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(element, parent, event);
    }

    if (skipAnimations) {
      close();
      return runner;
    }

    if (isStructural) {
      closeChildAnimations(element);
    }

    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', element, newAnimation, existingAnimation);
      if (skipAnimationFlag) {
        if (existingAnimation.state === RUNNING_STATE) {
          close();
          return runner;
        } else {
          mergeAnimationDetails(element, existingAnimation, newAnimation);
          return existingAnimation.runner;
        }
      }
      var cancelAnimationFlag = isAllowed('cancel', element, 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', element, newAnimation, existingAnimation);
        if (joinAnimationFlag) {
          if (existingAnimation.state === RUNNING_STATE) {
            normalizeAnimationDetails(element, newAnimation);
          } else {
            applyGeneratedPreparationClasses(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(element);
      return runner;
    }

    // the counter keeps track of cancelled animations
    var counter = (existingAnimation.counter || 0) + 1;
    newAnimation.counter = counter;

    markElementAnimationState(element, PRE_DIGEST_STATE, newAnimation);

    $rootScope.$$postDigest(function() {
      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(element);
        }

        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(element, RUNNING_STATE);
      var realRunner = $$animation(element, event, animationDetails.options);

      realRunner.done(function(status) {
        close(!status);
        var animationDetails = activeAnimationsLookup.get(node);
        if (animationDetails && animationDetails.counter === counter) {
          clearElementAnimationState(getDomNode(element));
        }
        notifyProgress(runner, event, 'close', {});
      });

      // this will update the runner's flow-control events based on
      // the `realRunner` object.
      runner.setHost(realRunner);
      notifyProgress(runner, event, 'start', {});
    });

    return runner;

    function notifyProgress(runner, event, phase, data) {
      runInNextPostDigestOrNow(function() {
        var callbacks = findCallbacks(parent, element, 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);
            });
          });
        }
      });
      runner.progress(event, phase, data);
    }

    function close(reject) { // jshint ignore:line
      clearGeneratedClasses(element, options);
      applyAnimationClasses(element, options);
      applyAnimationStyles(element, options);
      options.domOperation();
      runner.complete(!reject);
    }
  }

  function closeChildAnimations(element) {
    var node = getDomNode(element);
    var children = node.querySelectorAll('[' + NG_ANIMATE_ATTR_NAME + ']');
    forEach(children, function(child) {
      var state = parseInt(child.getAttribute(NG_ANIMATE_ATTR_NAME));
      var animationDetails = activeAnimationsLookup.get(child);
      if (animationDetails) {
        switch (state) {
          case RUNNING_STATE:
            animationDetails.runner.end();
            /* falls through */
          case PRE_DIGEST_STATE:
            activeAnimationsLookup.remove(child);
            break;
        }
      }
    });
  }

  function clearElementAnimationState(element) {
    var node = getDomNode(element);
    node.removeAttribute(NG_ANIMATE_ATTR_NAME);
    activeAnimationsLookup.remove(node);
  }

  function isMatchingElement(nodeOrElmA, nodeOrElmB) {
    return getDomNode(nodeOrElmA) === getDomNode(nodeOrElmB);
  }

  /**
   * 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 $rootElement
   */
  function areAnimationsAllowed(element, parentElement, event) {
    var bodyElement = jqLite($document[0].body);
    var bodyElementDetected = isMatchingElement(element, bodyElement) || element[0].nodeName === 'HTML';
    var rootElementDetected = isMatchingElement(element, $rootElement);
    var parentAnimationDetected = false;
    var animateChildren;
    var elementDisabled = disabledElementsLookup.get(getDomNode(element));

    var parentHost = jqLite.data(element[0], NG_ANIMATE_PIN_DATA);
    if (parentHost) {
      parentElement = parentHost;
    }

    parentElement = getDomNode(parentElement);

    while (parentElement) {
      if (!rootElementDetected) {
        // angular 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
        rootElementDetected = isMatchingElement(parentElement, $rootElement);
      }

      if (parentElement.nodeType !== ELEMENT_NODE) {
        // no point in inspecting the #document element
        break;
      }

      var details = activeAnimationsLookup.get(parentElement) || {};
      // 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 parentElementDisabled = disabledElementsLookup.get(parentElement);

        if (parentElementDisabled === 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 (parentElementDisabled === false) {
          elementDisabled = false;
        }
        parentAnimationDetected = details.structural;
      }

      if (isUndefined(animateChildren) || animateChildren === true) {
        var value = jqLite.data(parentElement, 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 (!bodyElementDetected) {
        // 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
        bodyElementDetected = isMatchingElement(parentElement, bodyElement);
      }

      if (bodyElementDetected && rootElementDetected) {
        // If both body and root have been found, any other checks are pointless,
        // as no animation data should live outside the application
        break;
      }

      if (!rootElementDetected) {
        // If no rootElement is detected, check if the parentElement is pinned to another element
        parentHost = jqLite.data(parentElement, NG_ANIMATE_PIN_DATA);
        if (parentHost) {
          // The pin target element becomes the next parent element
          parentElement = getDomNode(parentHost);
          continue;
        }
      }

      parentElement = parentElement.parentNode;
    }

    var allowAnimation = (!parentAnimationDetected || animateChildren) && elementDisabled !== true;
    return allowAnimation && rootElementDetected && bodyElementDetected;
  }

  function markElementAnimationState(element, state, details) {
    details = details || {};
    details.state = state;

    var node = getDomNode(element);
    node.setAttribute(NG_ANIMATE_ATTR_NAME, state);

    var oldValue = activeAnimationsLookup.get(node);
    var newValue = oldValue
        ? extend(oldValue, details)
        : details;
    activeAnimationsLookup.put(node, newValue);
  }
}];

}];

var $$AnimationProvider = ['$animateProvider', function($animateProvider) {

var NG_ANIMATE_REF_ATTR = 'ng-animate-ref';

var drivers = this.drivers = [];

var RUNNER_STORAGE_KEY = '$$animationRunner';

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', '$$HashMap', '$$rAFScheduler',
     function($$jqLite,   $rootScope,   $injector,   $$AnimateRunner,   $$HashMap,   $$rAFScheduler) {

  var animationQueue = [];
  var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);

  function sortAnimations(animations) {
    var tree = { children: [] };
    var i, lookup = new $$HashMap();

    // this is done first beforehand so that the hashmap
    // is filled with a list of the elements that will be animated
    for (i = 0; i < animations.length; i++) {
      var animation = animations[i];
      lookup.put(animation.domNode, animations[i] = {
        domNode: animation.domNode,
        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.put(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.fn);
        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;
    }

    setRunner(element, runner);

    var classes = mergeClasses(element.attr('class'), mergeClasses(options.addClass, options.removeClass));
    var tempClasses = options.tempClasses;
    if (tempClasses) {
      classes += ' ' + tempClasses;
      options.tempClasses = null;
    }

    var prepareClassName;
    if (isStructural) {
      prepareClassName = 'ng-' + event + PREPARE_CLASS_SUFFIX;
      $$jqLite.addClass(element, prepareClassName);
    }

    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) {
        toBeSortedAnimations.push({
          domNode: getDomNode(animationEntry.from ? animationEntry.from.element : animationEntry.element),
          fn: function triggerAnimationStart() {
            // 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();

            var startAnimationFn, closeFn = animationEntry.close;

            // 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.
      $$rAFScheduler(sortAnimations(toBeSortedAnimations));
    });

    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];
        if (!$injector.has(driverName)) continue; // TODO(matsko): remove this check

        var factory = $injector.get(driverName);
        var driver = factory(animationDetails);
        if (driver) {
          return driver;
        }
      }
    }

    function beforeStart() {
      element.addClass(NG_ANIMATE_CLASSNAME);
      if (tempClasses) {
        $$jqLite.addClass(element, tempClasses);
      }
      if (prepareClassName) {
        $$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) {
        getRunner(element).setHost(newRunner);
      }
    }

    function handleDestroyedElement() {
      var runner = getRunner(element);
      if (runner && (event !== 'leave' || !options.$$domOperationFired)) {
        runner.end();
      }
    }

    function close(rejected) { // jshint ignore:line
      element.off('$destroy', handleDestroyedElement);
      removeRunner(element);

      applyAnimationClasses(element, options);
      applyAnimationStyles(element, options);
      options.domOperation();

      if (tempClasses) {
        $$jqLite.removeClass(element, tempClasses);
      }

      element.removeClass(NG_ANIMATE_CLASSNAME);
      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 = ['$animate', '$rootScope', function($animate, $rootScope) {

return {
  restrict: 'A',
  transclude: 'element',
  terminal: true,
  priority: 600, // we use 600 here to ensure that the directive is caught before others
  link: function(scope, $element, attrs, ctrl, $transclude) {
    var previousElement, previousScope;
    scope.$watchCollection(attrs.ngAnimateSwap || attrs['for'], function(value) {
      if (previousElement) {
        $animate.leave(previousElement);
      }
      if (previousScope) {
        previousScope.$destroy();
        previousScope = null;
      }
      if (value || value === 0) {
        previousScope = scope.$new();
        $transclude(previousScope, function(element) {
          previousElement = element;
          $animate.enter(element, null, $element);
        });
      }
    });
  }
};

}];

/* global angularAnimateModule: true,

ngAnimateSwapDirective,
$$AnimateAsyncRunFactory,
$$rAFSchedulerFactory,
$$AnimateChildrenDirective,
$$AnimateQueueProvider,
$$AnimationProvider,
$AnimateCssProvider,
$$AnimateCssDriverProvider,
$$AnimateJsProvider,
$$AnimateJsDriverProvider,

*/

/**

* @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 Angular app.
*
* <div doc-module-components="ngAnimate"></div>
*
* # 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:ngRepeat#animations ngRepeat}                                                        | enter, leave and move                                                    |
* | {@link ngRoute.directive:ngView#animations ngView}                                                       | enter and leave                                                          |
* | {@link ng.directive:ngInclude#animations ngInclude}                                                      | enter and leave                                                          |
* | {@link ng.directive:ngSwitch#animations ngSwitch}                                                        | enter and leave                                                          |
* | {@link ng.directive:ngIf#animations ngIf}                                                                | enter and leave                                                          |
* | {@link ng.directive:ngClass#animations ngClass}                                                          | add and remove (the CSS class(es) present)                               |
* | {@link ng.directive:ngShow#animations ngShow} & {@link ng.directive:ngHide#animations ngHide}            | add and remove (the ng-hide class value)                                 |
* | {@link ng.directive:form#animation-hooks form} & {@link ng.directive:ngModel#animation-hooks ngModel}    | add and remove (dirty, pristine, valid, invalid & all other validations) |
* | {@link module:ngMessages#animations ngMessages}                                                          | add and remove (ng-active & ng-inactive)                                 |
* | {@link module:ngMessages#animations ngMessage}                                                           | enter and leave                                                          |
*
* (More information can be found by visiting each the documentation associated with each directive.)
*
* ## 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 Angular when an the 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=true">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;
* }
* .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;
* }
*
* ```
*
* ## 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 angular
*       // 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 Angular,
* 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) {
*
* 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', '$routeParams', function($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 $animate in your directive code
*
* So far we've explored how to feed in animations into an Angular application, but how do we trigger animations within our own directives in our application?
* By injecting the `$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
* $animate.enter(element, parent).then(function() {
*   //the animation has completed
* });
* ```
*
* (Note that earlier versions of Angular prior to v1.4 required the promise code to be wrapped using `$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 angular to notice any scope-related changes.)
*/

/**

* @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', [])

.directive('ngAnimateSwap', ngAnimateSwapDirective)

.directive('ngAnimateChildren', $$AnimateChildrenDirective)
.factory('$$rAFScheduler', $$rAFSchedulerFactory)

.provider('$$animateQueue', $$AnimateQueueProvider)
.provider('$$animation', $$AnimationProvider)

.provider('$animateCss', $AnimateCssProvider)
.provider('$$animateCssDriver', $$AnimateCssDriverProvider)

.provider('$$animateJs', $$AnimateJsProvider)
.provider('$$animateJsDriver', $$AnimateJsDriverProvider);

})(window, window.angular);