YLShipBuildLandMap/YLShipBuildLandMap.Web/wwwroot/scripts/angular-animate.js

/**
 * @license AngularJS v1.6.5
 * (c) 2010-2017 Google, Inc. http://angularjs.org
 * License: MIT
 */
(function (window, angular) {
    'use strict';

    var ELEMENT_NODE = 1;
    var COMMENT_NODE = 8;

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

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

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

// If unprefixed events are not supported but webkit-prefixed are, use the latter.
// Otherwise, just use W3C names, browsers not supporting them at all will just ignore them.
// Note: Chrome implements `window.onwebkitanimationend` and doesn't implement `window.onanimationend`
// but at the same time dispatches the `animationend` event and not `webkitAnimationEnd`.
// Register both events in case `window.onanimationend` is not supported because of that,
// do the same for `transitionend` as Safari is likely to exhibit similar behavior.
// Also, the only modern browser that uses vendor prefixes for transitions/keyframes is webkit
// therefore there is no reason to test anymore for other vendor prefixes:
// http://caniuse.com/#search=transition
    if ((window.ontransitionend === undefined) && (window.onwebkittransitionend !== undefined)) {
        CSS_PREFIX = '-webkit-';
        TRANSITION_PROP = 'WebkitTransition';
        TRANSITIONEND_EVENT = 'webkitTransitionEnd transitionend';
    } else {
        TRANSITION_PROP = 'transition';
        TRANSITIONEND_EVENT = 'transitionend';
    }

    if ((window.onanimationend === undefined) && (window.onwebkitanimationend !== undefined)) {
        CSS_PREFIX = '-webkit-';
        ANIMATION_PROP = 'WebkitAnimation';
        ANIMATIONEND_EVENT = 'webkitAnimationEnd animationend';
    } else {
        ANIMATION_PROP = 'animation';
        ANIMATIONEND_EVENT = 'animationend';
    }

    var DURATION_KEY = 'Duration';
    var PROPERTY_KEY = 'Property';
    var DELAY_KEY = 'Delay';
    var TIMING_KEY = 'TimingFunction';
    var ANIMATION_ITERATION_COUNT_KEY = 'IterationCount';
    var ANIMATION_PLAYSTATE_KEY = 'PlayState';
    var SAFE_FAST_FORWARD_DURATION_VALUE = 9999;

    var ANIMATION_DELAY_PROP = ANIMATION_PROP + DELAY_KEY;
    var ANIMATION_DURATION_PROP = ANIMATION_PROP + DURATION_KEY;
    var TRANSITION_DELAY_PROP = TRANSITION_PROP + DELAY_KEY;
    var TRANSITION_DURATION_PROP = TRANSITION_PROP + DURATION_KEY;

    var ngMinErr = angular.$$minErr('ng');

    function assertArg(arg, name, reason) {
        if (!arg) {
            throw ngMinErr('areq', 'Argument \'{0}\' is {1}', (name || '?'), (reason || 'required'));
        }
        return arg;
    }

    function mergeClasses(a, b) {
        if (!a && !b) return '';
        if (!a) return b;
        if (!b) return a;
        if (isArray(a)) a = a.join(' ');
        if (isArray(b)) b = b.join(' ');
        return a + ' ' + b;
    }

    function packageStyles(options) {
        var styles = {};
        if (options && (options.to || options.from)) {
            styles.to = options.to;
            styles.from = options.from;
        }
        return styles;
    }

    function pendClasses(classes, fix, isPrefix) {
        var className = '';
        classes = isArray(classes)
            ? classes
            : classes && isString(classes) && classes.length
                ? classes.split(/\s+/)
                : [];
        forEach(classes, function (klass, i) {
            if (klass && klass.length > 0) {
                className += (i > 0) ? ' ' : '';
                className += isPrefix ? fix + klass
                    : klass + fix;
            }
        });
        return className;
    }

    function removeFromArray(arr, val) {
        var index = arr.indexOf(val);
        if (val >= 0) {
            arr.splice(index, 1);
        }
    }

    function stripCommentsFromElement(element) {
        if (element instanceof jqLite) {
            switch (element.length) {
                case 0:
                    return element;

                case 1:
                    // there is no point of stripping anything if the element
                    // is the only element within the jqLite wrapper.
                    // (it's important that we retain the element instance.)
                    if (element[0].nodeType === ELEMENT_NODE) {
                        return element;
                    }
                    break;

                default:
                    return jqLite(extractElementNode(element));
            }
        }

        if (element.nodeType === ELEMENT_NODE) {
            return jqLite(element);
        }
    }

    function extractElementNode(element) {
        if (!element[0]) return element;
        for (var i = 0; i < element.length; i++) {
            var elm = element[i];
            if (elm.nodeType === ELEMENT_NODE) {
                return elm;
            }
        }
    }

    function $$addClass($$jqLite, element, className) {
        forEach(element, function (elm) {
            $$jqLite.addClass(elm, className);
        });
    }

    function $$removeClass($$jqLite, element, className) {
        forEach(element, function (elm) {
            $$jqLite.removeClass(elm, className);
        });
    }

    function applyAnimationClassesFactory($$jqLite) {
        return function (element, options) {
            if (options.addClass) {
                $$addClass($$jqLite, element, options.addClass);
                options.addClass = null;
            }
            if (options.removeClass) {
                $$removeClass($$jqLite, element, options.removeClass);
                options.removeClass = null;
            }
        };
    }

    function prepareAnimationOptions(options) {
        options = options || {};
        if (!options.$$prepared) {
            var domOperation = options.domOperation || noop;
            options.domOperation = function () {
                options.$$domOperationFired = true;
                domOperation();
                domOperation = noop;
            };
            options.$$prepared = true;
        }
        return options;
    }

    function applyAnimationStyles(element, options) {
        applyAnimationFromStyles(element, options);
        applyAnimationToStyles(element, options);
    }

    function applyAnimationFromStyles(element, options) {
        if (options.from) {
            element.css(options.from);
            options.from = null;
        }
    }

    function applyAnimationToStyles(element, options) {
        if (options.to) {
            element.css(options.to);
            options.to = null;
        }
    }

    function mergeAnimationDetails(element, oldAnimation, newAnimation) {
        var target = oldAnimation.options || {};
        var newOptions = newAnimation.options || {};

        var toAdd = (target.addClass || '') + ' ' + (newOptions.addClass || '');
        var toRemove = (target.removeClass || '') + ' ' + (newOptions.removeClass || '');
        var classes = resolveElementClasses(element.attr('class'), toAdd, toRemove);

        if (newOptions.preparationClasses) {
            target.preparationClasses = concatWithSpace(newOptions.preparationClasses, target.preparationClasses);
            delete newOptions.preparationClasses;
        }

        // noop is basically when there is no callback; otherwise something has been set
        var realDomOperation = target.domOperation !== noop ? target.domOperation : null;

        extend(target, newOptions);

        // TODO(matsko or sreeramu): proper fix is to maintain all animation callback in array and call at last,but now only leave has the callback so no issue with this.
        if (realDomOperation) {
            target.domOperation = realDomOperation;
        }

        if (classes.addClass) {
            target.addClass = classes.addClass;
        } else {
            target.addClass = null;
        }

        if (classes.removeClass) {
            target.removeClass = classes.removeClass;
        } else {
            target.removeClass = null;
        }

        oldAnimation.addClass = target.addClass;
        oldAnimation.removeClass = target.removeClass;

        return target;
    }

    function resolveElementClasses(existing, toAdd, toRemove) {
        var ADD_CLASS = 1;
        var REMOVE_CLASS = -1;

        var flags = {};
        existing = splitClassesToLookup(existing);

        toAdd = splitClassesToLookup(toAdd);
        forEach(toAdd, function (value, key) {
            flags[key] = ADD_CLASS;
        });

        toRemove = splitClassesToLookup(toRemove);
        forEach(toRemove, function (value, key) {
            flags[key] = flags[key] === ADD_CLASS ? null : REMOVE_CLASS;
        });

        var classes = {
            addClass: '',
            removeClass: ''
        };

        forEach(flags, function (val, klass) {
            var prop, allow;
            if (val === ADD_CLASS) {
                prop = 'addClass';
                allow = !existing[klass] || existing[klass + REMOVE_CLASS_SUFFIX];
            } else if (val === REMOVE_CLASS) {
                prop = 'removeClass';
                allow = existing[klass] || existing[klass + ADD_CLASS_SUFFIX];
            }
            if (allow) {
                if (classes[prop].length) {
                    classes[prop] += ' ';
                }
                classes[prop] += klass;
            }
        });

        function splitClassesToLookup(classes) {
            if (isString(classes)) {
                classes = classes.split(' ');
            }

            var obj = {};
            forEach(classes, function (klass) {
                // sometimes the split leaves empty string values
                // incase extra spaces were applied to the options
                if (klass.length) {
                    obj[klass] = true;
                }
            });
            return obj;
        }

        return classes;
    }

    function getDomNode(element) {
        return (element instanceof jqLite) ? element[0] : element;
    }

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

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

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

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

    function applyInlineStyle(node, styleTuple) {
        var prop = styleTuple[0];
        var value = styleTuple[1];
        node.style[prop] = value;
    }

    function concatWithSpace(a, b) {
        if (!a) return b;
        if (!b) return a;
        return a + ' ' + b;
    }

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

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

        queue = scheduler.queue = [];

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

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

        return scheduler;

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

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

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

    /**
     * @ngdoc directive
     * @name ngAnimateChildren
     * @restrict AE
     * @element ANY
     *
     * @description
     *
     * ngAnimateChildren allows you to specify that children of this element should animate even if any
     * of the children's parents are currently animating. By default, when an element has an active `enter`, `leave`, or `move`
     * (structural) animation, child elements that also have an active structural animation are not animated.
     *
     * Note that even if `ngAnimateChildren` is set, no child animations will run when the parent element is removed from the DOM (`leave` animation).
     *
     *
     * @param {string} ngAnimateChildren If the value is empty, `true` or `on`,
     *     then child animations are allowed. If the value is `false`, child animations are not allowed.
     *
     * @example
     * <example module="ngAnimateChildren" name="ngAnimateChildren" deps="angular-animate.js" animations="true">
     <file name="index.html">
     <div ng-controller="MainController as main">
     <label>Show container? <input type="checkbox" ng-model="main.enterElement" /></label>
     <label>Animate children? <input type="checkbox" ng-model="main.animateChildren" /></label>
     <hr>
     <div ng-animate-children="{{main.animateChildren}}">
     <div ng-if="main.enterElement" class="container">
     List of items:
     <div ng-repeat="item in [0, 1, 2, 3]" class="item">Item {{item}}</div>
     </div>
     </div>
     </div>
     </file>
     <file name="animations.css">

     .container.ng-enter,
     .container.ng-leave {
        transition: all ease 1.5s;
      }

     .container.ng-enter,
     .container.ng-leave-active {
        opacity: 0;
      }

     .container.ng-leave,
     .container.ng-enter-active {
        opacity: 1;
      }

     .item {
        background: firebrick;
        color: #FFF;
        margin-bottom: 10px;
      }

     .item.ng-enter,
     .item.ng-leave {
        transition: transform 1.5s ease;
      }

     .item.ng-enter {
        transform: translateX(50px);
      }

     .item.ng-enter-active {
        transform: translateX(0);
      }
     </file>
     <file name="script.js">
     angular.module('ngAnimateChildren', ['ngAnimate'])
     .controller('MainController', function MainController() {
          this.animateChildren = false;
          this.enterElement = false;
        });
     </file>
     </example>
     */
    var $$AnimateChildrenDirective = ['$interpolate', function ($interpolate) {
        return {
            link: function (scope, element, attrs) {
                var val = attrs.ngAnimateChildren;
                if (isString(val) && val.length === 0) { //empty attribute
                    element.data(NG_ANIMATE_CHILDREN_DATA, true);
                } else {
                    // Interpolate and set the value, so that it is available to
                    // animations that run right after compilation
                    setData($interpolate(val)(scope));
                    attrs.$observe('ngAnimateChildren', setData);
                }

                function setData(value) {
                    value = value === 'on' || value === 'true';
                    element.data(NG_ANIMATE_CHILDREN_DATA, value);
                }
            }
        };
    }];

    /* exported $AnimateCssProvider */

    var ANIMATE_TIMER_KEY = '$$animateCss';

    /**
     * @ngdoc service
     * @name $animateCss
     * @kind object
     *
     * @description
     * The `$animateCss` service is a useful utility to trigger customized CSS-based transitions/keyframes
     * from a JavaScript-based animation or directly from a directive. The purpose of `$animateCss` is NOT
     * to side-step how `$animate` and ngAnimate work, but the goal is to allow pre-existing animations or
     * directives to create more complex animations that can be purely driven using CSS code.
     *
     * Note that only browsers that support CSS transitions and/or keyframe animations are capable of
     * rendering animations triggered via `$animateCss` (bad news for IE9 and lower).
     *
     * ## Usage
     * Once again, `$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 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
// "OR" statement then it would not be enough to catch that.
    function registerRestorableStyles(backup, node, properties) {
        forEach(properties, function (prop) {
            backup[prop] = isDefined(backup[prop])
                ? backup[prop]
                : node.style.getPropertyValue(prop);
        });
    }

    var $AnimateCssProvider = ['$animateProvider', /** @this */ function ($animateProvider) {
        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 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) {
                        // 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) {
                                if (value) {
                                    node.style.setProperty(prop, value);
                                } else {
                                    node.style.removeProperty(prop);
                                }
                            });
                        }

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

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

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

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

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

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

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

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

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

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

                        // we now always use `Date.now()` due to the recent changes with
                        // event.timeStamp in Firefox, Webkit and Chrome (see #13494 for more info)
                        var timeStamp = ev.$manualTimeStamp || Date.now();

                        /* Firefox (or possibly just Gecko) likes to not round values up
         * when a ms measurement is used for the animation */
                        var elapsedTime = parseFloat(ev.elapsedTime.toFixed(ELAPSED_TIME_MAX_DECIMAL_PLACES));

                        /* $manualTimeStamp is a mocked timeStamp value which is set
         * within browserTrigger(). This is only here so that tests can
         * mock animations properly. Real events fallback to event.timeStamp,
         * or, if they don't, then a timeStamp is automatically created for them.
         * We're checking to see if the timeStamp surpasses the expected delay,
         * but we're using elapsedTime instead of the timeStamp on the 2nd
         * pre-condition since animationPauseds sometimes close off early */
                        if (Math.max(timeStamp - startTime, 0) >= maxDelayTime && elapsedTime >= maxDuration) {
                            // we set this flag to ensure that if the transition is paused then, when resumed,
                            // the animation will automatically close itself since transitions cannot be paused.
                            animationCompleted = true;
                            close();
                        }
                    }

                    function start() {
                        if (animationClosed) return;
                        if (!node.parentNode) {
                            close();
                            return;
                        }

                        // even though we only pause keyframe animations here the pause flag
                        // will still happen when transitions are used. Only the transition will
                        // not be paused since that is not possible. If the animation ends when
                        // paused then it will not complete until unpaused or cancelled.
                        var playPause = function (playAnimation) {
                            if (!animationCompleted) {
                                animationPaused = !playAnimation;
                                if (timings.animationDuration) {
                                    var value = blockKeyframeAnimations(node, animationPaused);
                                    if (animationPaused) {
                                        temporaryStyles.push(value);
                                    } else {
                                        removeFromArray(temporaryStyles, value);
                                    }
                                }
                            } else if (animationPaused && playAnimation) {
                                animationPaused = false;
                                close();
                            }
                        };

                        // checking the stagger duration prevents an accidentally cascade of the CSS delay style
                        // being inherited from the parent. If the transition duration is zero then we can safely
                        // rely that the delay value is an intentional stagger delay style.
                        var maxStagger = itemIndex > 0
                            && ((timings.transitionDuration && stagger.transitionDuration === 0) ||
                                (timings.animationDuration && stagger.animationDuration === 0))
                            && Math.max(stagger.animationDelay, stagger.transitionDelay);
                        if (maxStagger) {
                            $timeout(triggerAnimationStart,
                                Math.floor(maxStagger * itemIndex * ONE_SECOND),
                                false);
                        } else {
                            triggerAnimationStart();
                        }

                        // this will decorate the existing promise runner with pause/resume methods
                        runnerHost.resume = function () {
                            playPause(true);
                        };

                        runnerHost.pause = function () {
                            playPause(false);
                        };

                        function triggerAnimationStart() {
                            // just incase a stagger animation kicks in when the animation
                            // itself was cancelled entirely
                            if (animationClosed) return;

                            applyBlocking(false);

                            forEach(temporaryStyles, function (entry) {
                                var key = entry[0];
                                var value = entry[1];
                                node.style[key] = value;
                            });

                            applyAnimationClasses(element, options);
                            $$jqLite.addClass(element, activeClasses);

                            if (flags.recalculateTimingStyles) {
                                fullClassName = node.getAttribute('class') + ' ' + preparationClasses;
                                cacheKey = 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', /** @this */ function ($$animationProvider) {
        $$animationProvider.drivers.push('$$animateCssDriver');

        var NG_ANIMATE_SHIM_CLASS_NAME = 'ng-animate-shim';
        var NG_ANIMATE_ANCHOR_CLASS_NAME = 'ng-anchor';

        var NG_OUT_ANCHOR_CLASS_NAME = 'ng-anchor-out';
        var NG_IN_ANCHOR_CLASS_NAME = 'ng-anchor-in';

        function isDocumentFragment(node) {
            return node.parentNode && node.parentNode.nodeType === 11;
        }

        this.$get = ['$animateCss', '$rootScope', '$$AnimateRunner', '$rootElement', '$sniffer', '$$jqLite', '$document',
            function ($animateCss, $rootScope, $$AnimateRunner, $rootElement, $sniffer, $$jqLite, $document) {

                // only browsers that support these properties can render animations
                if (!$sniffer.animations && !$sniffer.transitions) return noop;

                var bodyNode = $document[0].body;
                var rootNode = getDomNode($rootElement);

                var rootBodyElement = jqLite(
                    // this is to avoid using something that exists outside of the body
                    // we also special case the doc fragment case because our unit test code
                    // appends the $rootElement to the body after the app has been bootstrapped
                    isDocumentFragment(rootNode) || bodyNode.contains(rootNode) ? rootNode : bodyNode
                );

                return function initDriverFn(animationDetails) {
                    return animationDetails.from && animationDetails.to
                        ? prepareFromToAnchorAnimation(animationDetails.from,
                            animationDetails.to,
                            animationDetails.classes,
                            animationDetails.anchors)
                        : prepareRegularAnimation(animationDetails);
                };

                function filterCssClasses(classes) {
                    //remove all the `ng-` stuff
                    return classes.replace(/\bng-\S+\b/g, '');
                }

                function getUniqueValues(a, b) {
                    if (isString(a)) a = a.split(' ');
                    if (isString(b)) b = b.split(' ');
                    return a.filter(function (val) {
                        return b.indexOf(val) === -1;
                    }).join(' ');
                }

                function prepareAnchoredAnimation(classes, outAnchor, inAnchor) {
                    var clone = jqLite(getDomNode(outAnchor).cloneNode(true));
                    var startingClasses = filterCssClasses(getClassVal(clone));

                    outAnchor.addClass(NG_ANIMATE_SHIM_CLASS_NAME);
                    inAnchor.addClass(NG_ANIMATE_SHIM_CLASS_NAME);

                    clone.addClass(NG_ANIMATE_ANCHOR_CLASS_NAME);

                    rootBodyElement.append(clone);

                    var animatorIn, animatorOut = prepareOutAnimation();

                    // the user may not end up using the `out` animation and
                    // only making use of the `in` animation or vice-versa.
                    // In either case we should allow this and not assume the
                    // animation is over unless both animations are not used.
                    if (!animatorOut) {
                        animatorIn = prepareInAnimation();
                        if (!animatorIn) {
                            return end();
                        }
                    }

                    var startingAnimator = animatorOut || animatorIn;

                    return {
                        start: function () {
                            var runner;

                            var currentAnimation = startingAnimator.start();
                            currentAnimation.done(function () {
                                currentAnimation = null;
                                if (!animatorIn) {
                                    animatorIn = prepareInAnimation();
                                    if (animatorIn) {
                                        currentAnimation = animatorIn.start();
                                        currentAnimation.done(function () {
                                            currentAnimation = null;
                                            end();
                                            runner.complete();
                                        });
                                        return currentAnimation;
                                    }
                                }
                                // in the event that there is no `in` animation
                                end();
                                runner.complete();
                            });

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

                            return runner;

                            function endFn() {
                                if (currentAnimation) {
                                    currentAnimation.end();
                                }
                            }
                        }
                    };

                    function calculateAnchorStyles(anchor) {
                        var styles = {};

                        var coords = getDomNode(anchor).getBoundingClientRect();

                        // we iterate directly since safari messes up and doesn't return
                        // all the keys for the coords object when iterated
                        forEach(['width', 'height', 'top', 'left'], function (key) {
                            var value = coords[key];
                            switch (key) {
                                case 'top':
                                    value += bodyNode.scrollTop;
                                    break;
                                case 'left':
                                    value += bodyNode.scrollLeft;
                                    break;
                            }
                            styles[key] = Math.floor(value) + 'px';
                        });
                        return styles;
                    }

                    function prepareOutAnimation() {
                        var animator = $animateCss(clone, {
                            addClass: NG_OUT_ANCHOR_CLASS_NAME,
                            delay: true,
                            from: calculateAnchorStyles(outAnchor)
                        });

                        // read the comment within `prepareRegularAnimation` to understand
                        // why this check is necessary
                        return animator.$$willAnimate ? animator : null;
                    }

                    function getClassVal(element) {
                        return element.attr('class') || '';
                    }

                    function prepareInAnimation() {
                        var endingClasses = filterCssClasses(getClassVal(inAnchor));
                        var toAdd = getUniqueValues(endingClasses, startingClasses);
                        var toRemove = getUniqueValues(startingClasses, endingClasses);

                        var animator = $animateCss(clone, {
                            to: calculateAnchorStyles(inAnchor),
                            addClass: NG_IN_ANCHOR_CLASS_NAME + ' ' + toAdd,
                            removeClass: NG_OUT_ANCHOR_CLASS_NAME + ' ' + toRemove,
                            delay: true
                        });

                        // read the comment within `prepareRegularAnimation` to understand
                        // why this check is necessary
                        return animator.$$willAnimate ? animator : null;
                    }

                    function end() {
                        clone.remove();
                        outAnchor.removeClass(NG_ANIMATE_SHIM_CLASS_NAME);
                        inAnchor.removeClass(NG_ANIMATE_SHIM_CLASS_NAME);
                    }
                }

                function prepareFromToAnchorAnimation(from, to, classes, anchors) {
                    var fromAnimation = prepareRegularAnimation(from, noop);
                    var toAnimation = prepareRegularAnimation(to, noop);

                    var anchorAnimations = [];
                    forEach(anchors, function (anchor) {
                        var outElement = anchor['out'];
                        var inElement = anchor['in'];
                        var animator = prepareAnchoredAnimation(classes, outElement, inElement);
                        if (animator) {
                            anchorAnimations.push(animator);
                        }
                    });

                    // no point in doing anything when there are no elements to animate
                    if (!fromAnimation && !toAnimation && anchorAnimations.length === 0) return;

                    return {
                        start: function () {
                            var animationRunners = [];

                            if (fromAnimation) {
                                animationRunners.push(fromAnimation.start());
                            }

                            if (toAnimation) {
                                animationRunners.push(toAnimation.start());
                            }

                            forEach(anchorAnimations, function (animation) {
                                animationRunners.push(animation.start());
                            });

                            var runner = new $$AnimateRunner({
                                end: endFn,
                                cancel: endFn // CSS-driven animations cannot be cancelled, only ended
                            });

                            $$AnimateRunner.all(animationRunners, function (status) {
                                runner.complete(status);
                            });

                            return runner;

                            function endFn() {
                                forEach(animationRunners, function (runner) {
                                    runner.end();
                                });
                            }
                        }
                    };
                }

                function prepareRegularAnimation(animationDetails) {
                    var element = animationDetails.element;
                    var options = animationDetails.options || {};

                    if (animationDetails.structural) {
                        options.event = animationDetails.event;
                        options.structural = true;
                        options.applyClassesEarly = true;

                        // we special case the leave animation since we want to ensure that
                        // the element is removed as soon as the animation is over. Otherwise
                        // a flicker might appear or the element may not be removed at all
                        if (animationDetails.event === 'leave') {
                            options.onDone = options.domOperation;
                        }
                    }

                    // We assign the preparationClasses as the actual animation event since
                    // the internals of $animateCss will just suffix the event token values
                    // with `-active` to trigger the animation.
                    if (options.preparationClasses) {
                        options.event = concatWithSpace(options.event, options.preparationClasses);
                    }

                    var animator = $animateCss(element, options);

                    // the driver lookup code inside of $$animation attempts to spawn a
                    // driver one by one until a driver returns a.$$willAnimate animator object.
                    // $animateCss will always return an object, however, it will pass in
                    // a flag as a hint as to whether an animation was detected or not
                    return animator.$$willAnimate ? animator : null;
                }
            }];
    }];

// TODO(matsko): use caching here to speed things up for detection
// TODO(matsko): add documentation
//  by the time...

    var $$AnimateJsProvider = ['$animateProvider', /** @this */ function ($animateProvider) {
        this.$get = ['$injector', '$$AnimateRunner', '$$jqLite',
            function ($injector, $$AnimateRunner, $$jqLite) {

                var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);
                // $animateJs(element, 'enter');
                return function (element, event, classes, options) {
                    var animationClosed = false;

                    // the `classes` argument is optional and if it is not used
                    // then the classes will be resolved from the element's className
                    // property as well as options.addClass/options.removeClass.
                    if (arguments.length === 3 && isObject(classes)) {
                        options = classes;
                        classes = null;
                    }

                    options = prepareAnimationOptions(options);
                    if (!classes) {
                        classes = element.attr('class') || '';
                        if (options.addClass) {
                            classes += ' ' + options.addClass;
                        }
                        if (options.removeClass) {
                            classes += ' ' + options.removeClass;
                        }
                    }

                    var classesToAdd = options.addClass;
                    var classesToRemove = options.removeClass;

                    // the lookupAnimations function returns a series of animation objects that are
                    // matched up with one or more of the CSS classes. These animation objects are
                    // defined via the module.animation factory function. If nothing is detected then
                    // we don't return anything which then makes $animation query the next driver.
                    var animations = lookupAnimations(classes);
                    var before, after;
                    if (animations.length) {
                        var afterFn, beforeFn;
                        if (event === 'leave') {
                            beforeFn = 'leave';
                            afterFn = 'afterLeave'; // TODO(matsko): get rid of this
                        } else {
                            beforeFn = 'before' + event.charAt(0).toUpperCase() + event.substr(1);
                            afterFn = event;
                        }

                        if (event !== 'enter' && event !== 'move') {
                            before = packageAnimations(element, event, options, animations, beforeFn);
                        }
                        after = packageAnimations(element, event, options, animations, afterFn);
                    }

                    // no matching animations
                    if (!before && !after) return;

                    function applyOptions() {
                        options.domOperation();
                        applyAnimationClasses(element, options);
                    }

                    function close() {
                        animationClosed = true;
                        applyOptions();
                        applyAnimationStyles(element, options);
                    }

                    var runner;

                    return {
                        $$willAnimate: true,
                        end: function () {
                            if (runner) {
                                runner.end();
                            } else {
                                close();
                                runner = new $$AnimateRunner();
                                runner.complete(true);
                            }
                            return runner;
                        },
                        start: function () {
                            if (runner) {
                                return runner;
                            }

                            runner = new $$AnimateRunner();
                            var closeActiveAnimations;
                            var chain = [];

                            if (before) {
                                chain.push(function (fn) {
                                    closeActiveAnimations = before(fn);
                                });
                            }

                            if (chain.length) {
                                chain.push(function (fn) {
                                    applyOptions();
                                    fn(true);
                                });
                            } else {
                                applyOptions();
                            }

                            if (after) {
                                chain.push(function (fn) {
                                    closeActiveAnimations = after(fn);
                                });
                            }

                            runner.setHost({
                                end: function () {
                                    endAnimations();
                                },
                                cancel: function () {
                                    endAnimations(true);
                                }
                            });

                            $$AnimateRunner.chain(chain, onComplete);
                            return runner;

                            function onComplete(success) {
                                close(success);
                                runner.complete(success);
                            }

                            function endAnimations(cancelled) {
                                if (!animationClosed) {
                                    (closeActiveAnimations || noop)(cancelled);
                                    onComplete(cancelled);
                                }
                            }
                        }
                    };

                    function executeAnimationFn(fn, element, event, options, onDone) {
                        var args;
                        switch (event) {
                            case 'animate':
                                args = [element, options.from, options.to, onDone];
                                break;

                            case 'setClass':
                                args = [element, classesToAdd, classesToRemove, onDone];
                                break;

                            case 'addClass':
                                args = [element, classesToAdd, onDone];
                                break;

                            case 'removeClass':
                                args = [element, classesToRemove, onDone];
                                break;

                            default:
                                args = [element, onDone];
                                break;
                        }

                        args.push(options);

                        var value = fn.apply(fn, args);
                        if (value) {
                            if (isFunction(value.start)) {
                                value = value.start();
                            }

                            if (value instanceof $$AnimateRunner) {
                                value.done(onDone);
                            } else if (isFunction(value)) {
                                // optional onEnd / onCancel callback
                                return value;
                            }
                        }

                        return noop;
                    }

                    function groupEventedAnimations(element, event, options, animations, fnName) {
                        var operations = [];
                        forEach(animations, function (ani) {
                            var animation = ani[fnName];
                            if (!animation) return;

                            // note that all of these animations will run in parallel
                            operations.push(function () {
                                var runner;
                                var endProgressCb;

                                var resolved = false;
                                var onAnimationComplete = function (rejected) {
                                    if (!resolved) {
                                        resolved = true;
                                        (endProgressCb || noop)(rejected);
                                        runner.complete(!rejected);
                                    }
                                };

                                runner = new $$AnimateRunner({
                                    end: function () {
                                        onAnimationComplete();
                                    },
                                    cancel: function () {
                                        onAnimationComplete(true);
                                    }
                                });

                                endProgressCb = executeAnimationFn(animation, element, event, options, function (result) {
                                    var cancelled = result === false;
                                    onAnimationComplete(cancelled);
                                });

                                return runner;
                            });
                        });

                        return operations;
                    }

                    function packageAnimations(element, event, options, animations, fnName) {
                        var operations = groupEventedAnimations(element, event, options, animations, fnName);
                        if (operations.length === 0) {
                            var a, b;
                            if (fnName === 'beforeSetClass') {
                                a = groupEventedAnimations(element, 'removeClass', options, animations, 'beforeRemoveClass');
                                b = groupEventedAnimations(element, 'addClass', options, animations, 'beforeAddClass');
                            } else if (fnName === 'setClass') {
                                a = groupEventedAnimations(element, 'removeClass', options, animations, 'removeClass');
                                b = groupEventedAnimations(element, 'addClass', options, animations, 'addClass');
                            }

                            if (a) {
                                operations = operations.concat(a);
                            }
                            if (b) {
                                operations = operations.concat(b);
                            }
                        }

                        if (operations.length === 0) return;

                        // TODO(matsko): add documentation
                        return function startAnimation(callback) {
                            var runners = [];
                            if (operations.length) {
                                forEach(operations, function (animateFn) {
                                    runners.push(animateFn());
                                });
                            }

                            if (runners.length) {
                                $$AnimateRunner.all(runners, callback);
                            } else {
                                callback();
                            }

                            return function endFn(reject) {
                                forEach(runners, function (runner) {
                                    if (reject) {
                                        runner.cancel();
                                    } else {
                                        runner.end();
                                    }
                                });
                            };
                        };
                    }
                };

                function lookupAnimations(classes) {
                    classes = isArray(classes) ? classes : classes.split(' ');
                    var matches = [], flagMap = {};
                    for (var i = 0; i < classes.length; i++) {
                        var klass = classes[i],
                            animationFactory = $animateProvider.$$registeredAnimations[klass];
                        if (animationFactory && !flagMap[klass]) {
                            matches.push($injector.get(animationFactory));
                            flagMap[klass] = true;
                        }
                    }
                    return matches;
                }
            }];
    }];

    var $$AnimateJsDriverProvider = ['$$animationProvider', /** @this */ function ($$animationProvider) {
        $$animationProvider.drivers.push('$$animateJsDriver');
        this.$get = ['$$animateJs', '$$AnimateRunner', function ($$animateJs, $$AnimateRunner) {
            return function initDriverFn(animationDetails) {
                if (animationDetails.from && animationDetails.to) {
                    var fromAnimation = prepareAnimation(animationDetails.from);
                    var toAnimation = prepareAnimation(animationDetails.to);
                    if (!fromAnimation && !toAnimation) return;

                    return {
                        start: function () {
                            var animationRunners = [];

                            if (fromAnimation) {
                                animationRunners.push(fromAnimation.start());
                            }

                            if (toAnimation) {
                                animationRunners.push(toAnimation.start());
                            }

                            $$AnimateRunner.all(animationRunners, done);

                            var runner = new $$AnimateRunner({
                                end: endFnFactory(),
                                cancel: endFnFactory()
                            });

                            return runner;

                            function endFnFactory() {
                                return function () {
                                    forEach(animationRunners, function (runner) {
                                        // at this point we cannot cancel animations for groups just yet. 1.5+
                                        runner.end();
                                    });
                                };
                            }

                            function done(status) {
                                runner.complete(status);
                            }
                        }
                    };
                } else {
                    return prepareAnimation(animationDetails);
                }
            };

            function prepareAnimation(animationDetails) {
                // TODO(matsko): make sure to check for grouped animations and delegate down to normal animations
                var element = animationDetails.element;
                var event = animationDetails.event;
                var options = animationDetails.options;
                var classes = animationDetails.classes;
                return $$animateJs(element, event, classes, options);
            }
        }];
    }];

    var NG_ANIMATE_ATTR_NAME = 'data-ng-animate';
    var NG_ANIMATE_PIN_DATA = '$ngAnimatePin';
    var $$AnimateQueueProvider = ['$animateProvider', /** @this */ function ($animateProvider) {
        var PRE_DIGEST_STATE = 1;
        var RUNNING_STATE = 2;
        var ONE_SPACE = ' ';

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

        function makeTruthyCssClassMap(classString) {
            if (!classString) {
                return null;
            }

            var keys = classString.split(ONE_SPACE);
            var map = Object.create(null);

            forEach(keys, function (key) {
                map[key] = true;
            });
            return map;
        }

        function hasMatchingClasses(newClassString, currentClassString) {
            if (newClassString && currentClassString) {
                var currentClassMap = makeTruthyCssClassMap(currentClassString);
                return newClassString.split(ONE_SPACE).some(function (className) {
                    return currentClassMap[className];
                });
            }
        }

        function isAllowed(ruleType, currentAnimation, previousAnimation) {
            return rules[ruleType].some(function (fn) {
                return fn(currentAnimation, previousAnimation);
            });
        }

        function hasAnimationClasses(animation, and) {
            var a = (animation.addClass || '').length > 0;
            var b = (animation.removeClass || '').length > 0;
            return and ? a && b : a || b;
        }

        rules.join.push(function (newAnimation, currentAnimation) {
            // if the new animation is class-based then we can just tack that on
            return !newAnimation.structural && hasAnimationClasses(newAnimation);
        });

        rules.skip.push(function (newAnimation, currentAnimation) {
            // there is no need to animate anything if no classes are being added and
            // there is no structural animation that will be triggered
            return !newAnimation.structural && !hasAnimationClasses(newAnimation);
        });

        rules.skip.push(function (newAnimation, currentAnimation) {
            // why should we trigger a new structural animation if the element will
            // be removed from the DOM anyway?
            return currentAnimation.event === 'leave' && newAnimation.structural;
        });

        rules.skip.push(function (newAnimation, currentAnimation) {
            // if there is an ongoing current animation then don't even bother running the class-based animation
            return currentAnimation.structural && currentAnimation.state === RUNNING_STATE && !newAnimation.structural;
        });

        rules.cancel.push(function (newAnimation, currentAnimation) {
            // there can never be two structural animations running at the same time
            return currentAnimation.structural && newAnimation.structural;
        });

        rules.cancel.push(function (newAnimation, currentAnimation) {
            // if the previous animation is already running, but the new animation will
            // be triggered, but the new animation is structural
            return currentAnimation.state === RUNNING_STATE && newAnimation.structural;
        });

        rules.cancel.push(function (newAnimation, currentAnimation) {
            // cancel the animation if classes added / removed in both animation cancel each other out,
            // but only if the current animation isn't structural

            if (currentAnimation.structural) return false;

            var nA = newAnimation.addClass;
            var nR = newAnimation.removeClass;
            var cA = currentAnimation.addClass;
            var cR = currentAnimation.removeClass;

            // early detection to save the global CPU shortage :)
            if ((isUndefined(nA) && isUndefined(nR)) || (isUndefined(cA) && isUndefined(cR))) {
                return false;
            }

            return hasMatchingClasses(nA, cR) || hasMatchingClasses(nR, cA);
        });

        this.$get = ['$$rAF', '$rootScope', '$rootElement', '$document', '$$Map',
            '$$animation', '$$AnimateRunner', '$templateRequest', '$$jqLite', '$$forceReflow',
            '$$isDocumentHidden',
            function ($$rAF, $rootScope, $rootElement, $document, $$Map,
                      $$animation, $$AnimateRunner, $templateRequest, $$jqLite, $$forceReflow,
                      $$isDocumentHidden) {

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

                function postDigestTaskFactory() {
                    var postDigestCalled = false;
                    return function (fn) {
                        // we only issue a call to postDigest before
                        // it has first passed. This prevents any callbacks
                        // from not firing once the animation has completed
                        // since it will be out of the digest cycle.
                        if (postDigestCalled) {
                            fn();
                        } else {
                            $rootScope.$$postDigest(function () {
                                postDigestCalled = true;
                                fn();
                            });
                        }
                    };
                }

                // Wait until all directive and route-related templates are downloaded and
                // compiled. The $templateRequest.totalPendingRequests variable keeps track of
                // all of the remote templates being currently downloaded. If there are no
                // templates currently downloading then the watcher will still fire anyway.
                var deregisterWatch = $rootScope.$watch(
                    function () {
                        return $templateRequest.totalPendingRequests === 0;
                    },
                    function (isEmpty) {
                        if (!isEmpty) return;
                        deregisterWatch();

                        // Now that all templates have been downloaded, $animate will wait until
                        // the post digest queue is empty before enabling animations. By having two
                        // calls to $postDigest calls we can ensure that the flag is enabled at the
                        // very end of the post digest queue. Since all of the animations in $animate
                        // use $postDigest, it's important that the code below executes at the end.
                        // This basically means that the page is fully downloaded and compiled before
                        // any animations are triggered.
                        $rootScope.$$postDigest(function () {
                            $rootScope.$$postDigest(function () {
                                // we check for null directly in the event that the application already called
                                // .enabled() with whatever arguments that it provided it with
                                if (animationsEnabled === null) {
                                    animationsEnabled = true;
                                }
                            });
                        });
                    }
                );

                var callbackRegistry = Object.create(null);

                // remember that the `customFilter`/`classNameFilter` are set during the
                // provider/config stage therefore we can optimize here and setup helper functions
                var customFilter = $animateProvider.customFilter();
                var classNameFilter = $animateProvider.classNameFilter();
                var returnTrue = function () {
                    return true;
                };

                var isAnimatableByFilter = customFilter || returnTrue;
                var isAnimatableClassName = !classNameFilter ? returnTrue : function (node, options) {
                    var className = [node.getAttribute('class'), options.addClass, options.removeClass].join(' ');
                    return classNameFilter.test(className);
                };

                var applyAnimationClasses = applyAnimationClassesFactory($$jqLite);

                function normalizeAnimationDetails(element, animation) {
                    return mergeAnimationDetails(element, animation, {});
                }

                // IE9-11 has no method "contains" in SVG element and in Node.prototype. Bug #10259.
                var contains = window.Node.prototype.contains || /** @this */ function (arg) {
                    // eslint-disable-next-line no-bitwise
                    return this === arg || !!(this.compareDocumentPosition(arg) & 16);
                };

                function findCallbacks(targetParentNode, targetNode, event) {
                    var matches = [];
                    var entries = callbackRegistry[event];
                    if (entries) {
                        forEach(entries, function (entry) {
                            if (contains.call(entry.node, targetNode)) {
                                matches.push(entry.callback);
                            } else if (event === 'leave' && contains.call(entry.node, targetParentNode)) {
                                matches.push(entry.callback);
                            }
                        });
                    }

                    return matches;
                }

                function filterFromRegistry(list, matchContainer, matchCallback) {
                    var containerNode = extractElementNode(matchContainer);
                    return list.filter(function (entry) {
                        var isMatch = entry.node === containerNode &&
                            (!matchCallback || entry.callback === matchCallback);
                        return !isMatch;
                    });
                }

                function cleanupEventListeners(phase, node) {
                    if (phase === 'close' && !node.parentNode) {
                        // If the element is not attached to a parentNode, it has been removed by
                        // the domOperation, and we can safely remove the event callbacks
                        $animate.off(node);
                    }
                }

                var $animate = {
                    on: function (event, container, callback) {
                        var node = extractElementNode(container);
                        callbackRegistry[event] = callbackRegistry[event] || [];
                        callbackRegistry[event].push({
                            node: node,
                            callback: callback
                        });

                        // Remove the callback when the element is removed from the DOM
                        jqLite(container).on('$destroy', function () {
                            var animationDetails = activeAnimationsLookup.get(node);

                            if (!animationDetails) {
                                // If there's an animation ongoing, the callback calling code will remove
                                // the event listeners. If we'd remove here, the callbacks would be removed
                                // before the animation ends
                                $animate.off(event, container, callback);
                            }
                        });
                    },

                    off: function (event, container, callback) {
                        if (arguments.length === 1 && !isString(arguments[0])) {
                            container = arguments[0];
                            for (var eventType in callbackRegistry) {
                                callbackRegistry[eventType] = filterFromRegistry(callbackRegistry[eventType], container);
                            }

                            return;
                        }

                        var entries = callbackRegistry[event];
                        if (!entries) return;

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

                    pin: function (element, parentElement) {
                        assertArg(isElement(element), 'element', 'not an element');
                        assertArg(isElement(parentElement), 'parentElement', 'not an element');
                        element.data(NG_ANIMATE_PIN_DATA, parentElement);
                    },

                    push: function (element, event, options, domOperation) {
                        options = options || {};
                        options.domOperation = domOperation;
                        return queueAnimation(element, event, options);
                    },

                    // this method has four signatures:
                    //  () - global getter
                    //  (bool) - global setter
                    //  (element) - element getter
                    //  (element, bool) - element setter<F37>
                    enabled: function (element, bool) {
                        var argCount = arguments.length;

                        if (argCount === 0) {
                            // () - Global getter
                            bool = !!animationsEnabled;
                        } else {
                            var hasElement = isElement(element);

                            if (!hasElement) {
                                // (bool) - Global setter
                                bool = animationsEnabled = !!element;
                            } else {
                                var node = getDomNode(element);

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

                        return bool;
                    }
                };

                return $animate;

                function queueAnimation(originalElement, event, initialOptions) {
                    // we always make a copy of the options since
                    // there should never be any side effects on
                    // the input data when running `$animateCss`.
                    var options = copy(initialOptions);

                    var element = stripCommentsFromElement(originalElement);
                    var node = getDomNode(element);
                    var parentNode = node && node.parentNode;

                    options = prepareAnimationOptions(options);

                    // we create a fake runner with a working promise.
                    // These methods will become available after the digest has passed
                    var runner = new $$AnimateRunner();

                    // this is used to trigger callbacks in postDigest mode
                    var runInNextPostDigestOrNow = postDigestTaskFactory();

                    if (isArray(options.addClass)) {
                        options.addClass = options.addClass.join(' ');
                    }

                    if (options.addClass && !isString(options.addClass)) {
                        options.addClass = null;
                    }

                    if (isArray(options.removeClass)) {
                        options.removeClass = options.removeClass.join(' ');
                    }

                    if (options.removeClass && !isString(options.removeClass)) {
                        options.removeClass = null;
                    }

                    if (options.from && !isObject(options.from)) {
                        options.from = null;
                    }

                    if (options.to && !isObject(options.to)) {
                        options.to = null;
                    }

                    // If animations are hard-disabled for the whole application there is no need to continue.
                    // There are also situations where a directive issues an animation for a jqLite wrapper that
                    // contains only comment nodes. In this case, there is no way we can perform an animation.
                    if (!animationsEnabled ||
                        !node ||
                        !isAnimatableByFilter(node, event, initialOptions) ||
                        !isAnimatableClassName(node, options)) {
                        close();
                        return runner;
                    }

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

                    var documentHidden = $$isDocumentHidden();

                    // This is a hard disable of all animations the element itself, therefore  there is no need to
                    // continue further past this point if not enabled
                    // Animations are also disabled if the document is currently hidden (page is not visible
                    // to the user), because browsers slow down or do not flush calls to requestAnimationFrame
                    var skipAnimations = documentHidden || disabledElementsLookup.get(node);
                    var existingAnimation = (!skipAnimations && activeAnimationsLookup.get(node)) || {};
                    var hasExistingAnimation = !!existingAnimation.state;

                    // there is no point in traversing the same collection of parent ancestors if a followup
                    // animation will be run on the same element that already did all that checking work
                    if (!skipAnimations && (!hasExistingAnimation || existingAnimation.state !== PRE_DIGEST_STATE)) {
                        skipAnimations = !areAnimationsAllowed(node, parentNode, event);
                    }

                    if (skipAnimations) {
                        // Callbacks should fire even if the document is hidden (regression fix for issue #14120)
                        if (documentHidden) notifyProgress(runner, event, 'start');
                        close();
                        if (documentHidden) notifyProgress(runner, event, 'close');
                        return runner;
                    }

                    if (isStructural) {
                        closeChildAnimations(node);
                    }

                    var newAnimation = {
                        structural: isStructural,
                        element: element,
                        event: event,
                        addClass: options.addClass,
                        removeClass: options.removeClass,
                        close: close,
                        options: options,
                        runner: runner
                    };

                    if (hasExistingAnimation) {
                        var skipAnimationFlag = isAllowed('skip', newAnimation, existingAnimation);
                        if (skipAnimationFlag) {
                            if (existingAnimation.state === RUNNING_STATE) {
                                close();
                                return runner;
                            } else {
                                mergeAnimationDetails(element, existingAnimation, newAnimation);
                                return existingAnimation.runner;
                            }
                        }
                        var cancelAnimationFlag = isAllowed('cancel', newAnimation, existingAnimation);
                        if (cancelAnimationFlag) {
                            if (existingAnimation.state === RUNNING_STATE) {
                                // this will end the animation right away and it is safe
                                // to do so since the animation is already running and the
                                // runner callback code will run in async
                                existingAnimation.runner.end();
                            } else if (existingAnimation.structural) {
                                // this means that the animation is queued into a digest, but
                                // hasn't started yet. Therefore it is safe to run the close
                                // method which will call the runner methods in async.
                                existingAnimation.close();
                            } else {
                                // this will merge the new animation options into existing animation options
                                mergeAnimationDetails(element, existingAnimation, newAnimation);

                                return existingAnimation.runner;
                            }
                        } else {
                            // a joined animation means that this animation will take over the existing one
                            // so an example would involve a leave animation taking over an enter. Then when
                            // the postDigest kicks in the enter will be ignored.
                            var joinAnimationFlag = isAllowed('join', newAnimation, existingAnimation);
                            if (joinAnimationFlag) {
                                if (existingAnimation.state === RUNNING_STATE) {
                                    normalizeAnimationDetails(element, newAnimation);
                                } else {
                                    applyGeneratedPreparationClasses(element, isStructural ? event : null, options);

                                    event = newAnimation.event = existingAnimation.event;
                                    options = mergeAnimationDetails(element, existingAnimation, newAnimation);

                                    //we return the same runner since only the option values of this animation will
                                    //be fed into the `existingAnimation`.
                                    return existingAnimation.runner;
                                }
                            }
                        }
                    } else {
                        // normalization in this case means that it removes redundant CSS classes that
                        // already exist (addClass) or do not exist (removeClass) on the element
                        normalizeAnimationDetails(element, newAnimation);
                    }

                    // when the options are merged and cleaned up we may end up not having to do
                    // an animation at all, therefore we should check this before issuing a post
                    // digest callback. Structural animations will always run no matter what.
                    var isValidAnimation = newAnimation.structural;
                    if (!isValidAnimation) {
                        // animate (from/to) can be quickly checked first, otherwise we check if any classes are present
                        isValidAnimation = (newAnimation.event === 'animate' && Object.keys(newAnimation.options.to || {}).length > 0)
                            || hasAnimationClasses(newAnimation);
                    }

                    if (!isValidAnimation) {
                        close();
                        clearElementAnimationState(node);
                        return runner;
                    }

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

                    markElementAnimationState(node, PRE_DIGEST_STATE, newAnimation);

                    $rootScope.$$postDigest(function () {
                        // It is possible that the DOM nodes inside `originalElement` have been replaced. This can
                        // happen if the animated element is a transcluded clone and also has a `templateUrl`
                        // directive on it. Therefore, we must recreate `element` in order to interact with the
                        // actual DOM nodes.
                        // Note: We still need to use the old `node` for certain things, such as looking up in
                        //       HashMaps where it was used as the key.

                        element = stripCommentsFromElement(originalElement);

                        var animationDetails = activeAnimationsLookup.get(node);
                        var animationCancelled = !animationDetails;
                        animationDetails = animationDetails || {};

                        // if addClass/removeClass is called before something like enter then the
                        // registered parent element may not be present. The code below will ensure
                        // that a final value for parent element is obtained
                        var parentElement = element.parent() || [];

                        // animate/structural/class-based animations all have requirements. Otherwise there
                        // is no point in performing an animation. The parent node must also be set.
                        var isValidAnimation = parentElement.length > 0
                            && (animationDetails.event === 'animate'
                                || animationDetails.structural
                                || hasAnimationClasses(animationDetails));

                        // this means that the previous animation was cancelled
                        // even if the follow-up animation is the same event
                        if (animationCancelled || animationDetails.counter !== counter || !isValidAnimation) {
                            // if another animation did not take over then we need
                            // to make sure that the domOperation and options are
                            // handled accordingly
                            if (animationCancelled) {
                                applyAnimationClasses(element, options);
                                applyAnimationStyles(element, options);
                            }

                            // if the event changed from something like enter to leave then we do
                            // it, otherwise if it's the same then the end result will be the same too
                            if (animationCancelled || (isStructural && animationDetails.event !== event)) {
                                options.domOperation();
                                runner.end();
                            }

                            // in the event that the element animation was not cancelled or a follow-up animation
                            // isn't allowed to animate from here then we need to clear the state of the element
                            // so that any future animations won't read the expired animation data.
                            if (!isValidAnimation) {
                                clearElementAnimationState(node);
                            }

                            return;
                        }

                        // this combined multiple class to addClass / removeClass into a setClass event
                        // so long as a structural event did not take over the animation
                        event = !animationDetails.structural && hasAnimationClasses(animationDetails, true)
                            ? 'setClass'
                            : animationDetails.event;

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

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

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

                    return runner;

                    function notifyProgress(runner, event, phase, data) {
                        runInNextPostDigestOrNow(function () {
                            var callbacks = findCallbacks(parentNode, node, event);
                            if (callbacks.length) {
                                // do not optimize this call here to RAF because
                                // we don't know how heavy the callback code here will
                                // be and if this code is buffered then this can
                                // lead to a performance regression.
                                $$rAF(function () {
                                    forEach(callbacks, function (callback) {
                                        callback(element, phase, data);
                                    });
                                    cleanupEventListeners(phase, node);
                                });
                            } else {
                                cleanupEventListeners(phase, node);
                            }
                        });
                        runner.progress(event, phase, data);
                    }

                    function close(reject) {
                        clearGeneratedClasses(element, options);
                        applyAnimationClasses(element, options);
                        applyAnimationStyles(element, options);
                        options.domOperation();
                        runner.complete(!reject);
                    }
                }

                function closeChildAnimations(node) {
                    var children = node.querySelectorAll('[' + NG_ANIMATE_ATTR_NAME + ']');
                    forEach(children, function (child) {
                        var state = parseInt(child.getAttribute(NG_ANIMATE_ATTR_NAME), 10);
                        var animationDetails = activeAnimationsLookup.get(child);
                        if (animationDetails) {
                            switch (state) {
                                case RUNNING_STATE:
                                    animationDetails.runner.end();
                                /* falls through */
                                case PRE_DIGEST_STATE:
                                    activeAnimationsLookup.delete(child);
                                    break;
                            }
                        }
                    });
                }

                function clearElementAnimationState(node) {
                    node.removeAttribute(NG_ANIMATE_ATTR_NAME);
                    activeAnimationsLookup.delete(node);
                }

                /**
                 * This fn returns false if any of the following is true:
                 * a) animations on any parent element are disabled, and animations on the element aren't explicitly allowed
                 * b) a parent element has an ongoing structural animation, and animateChildren is false
                 * c) the element is not a child of the body
                 * d) the element is not a child of the $rootElement
                 */
                function areAnimationsAllowed(node, parentNode, event) {
                    var bodyNode = $document[0].body;
                    var rootNode = getDomNode($rootElement);

                    var bodyNodeDetected = (node === bodyNode) || node.nodeName === 'HTML';
                    var rootNodeDetected = (node === rootNode);
                    var parentAnimationDetected = false;
                    var elementDisabled = disabledElementsLookup.get(node);
                    var animateChildren;

                    var parentHost = jqLite.data(node, NG_ANIMATE_PIN_DATA);
                    if (parentHost) {
                        parentNode = getDomNode(parentHost);
                    }

                    while (parentNode) {
                        if (!rootNodeDetected) {
                            // 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
                            rootNodeDetected = (parentNode === rootNode);
                        }

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

                        var details = activeAnimationsLookup.get(parentNode) || {};
                        // either an enter, leave or move animation will commence
                        // therefore we can't allow any animations to take place
                        // but if a parent animation is class-based then that's ok
                        if (!parentAnimationDetected) {
                            var parentNodeDisabled = disabledElementsLookup.get(parentNode);

                            if (parentNodeDisabled === true && elementDisabled !== false) {
                                // disable animations if the user hasn't explicitly enabled animations on the
                                // current element
                                elementDisabled = true;
                                // element is disabled via parent element, no need to check anything else
                                break;
                            } else if (parentNodeDisabled === false) {
                                elementDisabled = false;
                            }
                            parentAnimationDetected = details.structural;
                        }

                        if (isUndefined(animateChildren) || animateChildren === true) {
                            var value = jqLite.data(parentNode, NG_ANIMATE_CHILDREN_DATA);
                            if (isDefined(value)) {
                                animateChildren = value;
                            }
                        }

                        // there is no need to continue traversing at this point
                        if (parentAnimationDetected && animateChildren === false) break;

                        if (!bodyNodeDetected) {
                            // we also need to ensure that the element is or will be a part of the body element
                            // otherwise it is pointless to even issue an animation to be rendered
                            bodyNodeDetected = (parentNode === bodyNode);
                        }

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

                        if (!rootNodeDetected) {
                            // If `rootNode` is not detected, check if `parentNode` is pinned to another element
                            parentHost = jqLite.data(parentNode, NG_ANIMATE_PIN_DATA);
                            if (parentHost) {
                                // The pin target element becomes the next parent element
                                parentNode = getDomNode(parentHost);
                                continue;
                            }
                        }

                        parentNode = parentNode.parentNode;
                    }

                    var allowAnimation = (!parentAnimationDetected || animateChildren) && elementDisabled !== true;
                    return allowAnimation && rootNodeDetected && bodyNodeDetected;
                }

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

                    node.setAttribute(NG_ANIMATE_ATTR_NAME, state);

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

    /* exported $$AnimationProvider */

    var $$AnimationProvider = ['$animateProvider', /** @this */ function ($animateProvider) {
        var NG_ANIMATE_REF_ATTR = 'ng-animate-ref';

        var drivers = this.drivers = [];

        var RUNNER_STORAGE_KEY = '$$animationRunner';

        function setRunner(element, runner) {
            element.data(RUNNER_STORAGE_KEY, runner);
        }

        function removeRunner(element) {
            element.removeData(RUNNER_STORAGE_KEY);
        }

        function getRunner(element) {
            return element.data(RUNNER_STORAGE_KEY);
        }

        this.$get = ['$$jqLite', '$rootScope', '$injector', '$$AnimateRunner', '$$Map', '$$rAFScheduler',
            function ($$jqLite, $rootScope, $injector, $$AnimateRunner, $$Map, $$rAFScheduler) {

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

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

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

                    for (i = 0; i < animations.length; i++) {
                        processNode(animations[i]);
                    }

                    return flatten(tree);

                    function processNode(entry) {
                        if (entry.processed) return entry;
                        entry.processed = true;

                        var elementNode = entry.domNode;
                        var parentNode = elementNode.parentNode;
                        lookup.set(elementNode, entry);

                        var parentEntry;
                        while (parentNode) {
                            parentEntry = lookup.get(parentNode);
                            if (parentEntry) {
                                if (!parentEntry.processed) {
                                    parentEntry = processNode(parentEntry);
                                }
                                break;
                            }
                            parentNode = parentNode.parentNode;
                        }

                        (parentEntry || tree).children.push(entry);
                        return entry;
                    }

                    function flatten(tree) {
                        var result = [];
                        var queue = [];
                        var i;

                        for (i = 0; i < tree.children.length; i++) {
                            queue.push(tree.children[i]);
                        }

                        var remainingLevelEntries = queue.length;
                        var nextLevelEntries = 0;
                        var row = [];

                        for (i = 0; i < queue.length; i++) {
                            var entry = queue[i];
                            if (remainingLevelEntries <= 0) {
                                remainingLevelEntries = nextLevelEntries;
                                nextLevelEntries = 0;
                                result.push(row);
                                row = [];
                            }
                            row.push(entry.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];
                            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) {
                            var runner = getRunner(element);
                            if (runner) runner.setHost(newRunner);
                        }
                    }

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

                    function close(rejected) {
                        element.off('$destroy', handleDestroyedElement);
                        removeRunner(element);

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

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

                        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);
                        });
                    }
                });
            }
        };
    }];

    /**
     * @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 underlying directive performs an operation.
     *
     * The example below shows how an `enter` animation can be made possible on an element using `ng-if`:
     *
     * ```html
     * <div ng-if="bool" class="fade">
     *    Fade me in out
     * </div>
     * <button ng-click="bool=true">Fade In!</button>
     * <button ng-click="bool=false">Fade Out!</button>
     * ```
     *
     * Notice the CSS class **fade**? We can now create the CSS transition code that references this class:
     *
     * ```css
     * /&#42; The starting CSS styles for the enter animation &#42;/
     * .fade.ng-enter {
     *   transition:0.5s linear all;
     *   opacity:0;
     * }
     *
     * /&#42; The finishing CSS styles for the enter animation &#42;/
     * .fade.ng-enter.ng-enter-active {
     *   opacity:1;
     * }
     * ```
     *
     * The key thing to remember here is that, depending on the animation event (which each of the directives above trigger depending on what's going on) two
     * generated CSS classes will be applied to the element; in the example above we have `.ng-enter` and `.ng-enter-active`. For CSS transitions, the transition
     * code **must** be defined within the starting CSS class (in this case `.ng-enter`). The destination class is what the transition will animate towards.
     *
     * If for example we wanted to create animations for `leave` and `move` (ngRepeat triggers move) then we can do so using the same CSS naming conventions:
     *
     * ```css
     * /&#42; now the element will fade out before it is removed from the DOM &#42;/
     * .fade.ng-leave {
     *   transition:0.5s linear all;
     *   opacity:1;
     * }
     * .fade.ng-leave.ng-leave-active {
     *   opacity:0;
     * }
     * ```
     *
     * We can also make use of **CSS Keyframes** by referencing the keyframe animation within the starting CSS class:
     *
     * ```css
     * /&#42; there is no need to define anything inside of the destination
     * CSS class since the keyframe will take charge of the animation &#42;/
     * .fade.ng-leave {
     *   animation: my_fade_animation 0.5s linear;
     *   -webkit-animation: my_fade_animation 0.5s linear;
     * }
     *
     * @keyframes my_fade_animation {
     *   from { opacity:1; }
     *   to { opacity:0; }
     * }
     *
     * @-webkit-keyframes my_fade_animation {
     *   from { opacity:1; }
     *   to { opacity:0; }
     * }
     * ```
     *
     * Feel free also mix transitions and keyframes together as well as any other CSS classes on the same element.
     *
     * ### CSS Class-based Animations
     *
     * Class-based animations (animations that are triggered via `ngClass`, `ngShow`, `ngHide` and some other directives) have a slightly different
     * naming convention. Class-based animations are basic enough that a standard transition or keyframe can be referenced on the class being added
     * and removed.
     *
     * For example if we wanted to do a CSS animation for `ngHide` then we place an animation on the `.ng-hide` CSS class:
     *
     * ```html
     * <div ng-show="bool" class="fade">
     *   Show and hide me
     * </div>
     * <button ng-click="bool=!bool">Toggle</button>
     *
     * <style>
     * .fade.ng-hide {
     *   transition:0.5s linear all;
     *   opacity:0;
     * }
     * </style>
     * ```
     *
     * All that is going on here with ngShow/ngHide behind the scenes is the `.ng-hide` class is added/removed (when the hidden state is valid). Since
     * ngShow and ngHide are animation aware then we can match up a transition and ngAnimate handles the rest.
     *
     * In addition the addition and removal of the CSS class, ngAnimate also provides two helper methods that we can use to further decorate the animation
     * with CSS styles.
     *
     * ```html
     * <div ng-class="{on:onOff}" class="highlight">
     *   Highlight this box
     * </div>
     * <button ng-click="onOff=!onOff">Toggle</button>
     *
     * <style>
     * .highlight {
     *   transition:0.5s linear all;
     * }
     * .highlight.on-add {
     *   background:white;
     * }
     * .highlight.on {
     *   background:yellow;
     * }
     * .highlight.on-remove {
     *   background:black;
     * }
     * </style>
     * ```
     *
     * We can also make use of CSS keyframes by placing them within the CSS classes.
     *
     *
     * ### CSS Staggering Animations
     * A Staggering animation is a collection of animations that are issued with a slight delay in between each successive operation resulting in a
     * curtain-like effect. The ngAnimate module (versions >=1.2) supports staggering animations and the stagger effect can be
     * performed by creating a **ng-EVENT-stagger** CSS class and attaching that class to the base CSS class used for
     * the animation. The style property expected within the stagger class can either be a **transition-delay** or an
     * **animation-delay** property (or both if your animation contains both transitions and keyframe animations).
     *
     * ```css
     * .my-animation.ng-enter {
     *   /&#42; standard transition code &#42;/
     *   transition: 1s linear all;
     *   opacity:0;
     * }
     * .my-animation.ng-enter-stagger {
     *   /&#42; this will have a 100ms delay between each successive leave animation &#42;/
     *   transition-delay: 0.1s;
     *
     *   /&#42; As of 1.4.4, this must always be set: it signals ngAnimate
     *     to not accidentally inherit a delay property from another CSS class &#42;/
     *   transition-duration: 0s;
     *
     *   /&#42; if you are using animations instead of transitions you should configure as follows:
     *     animation-delay: 0.1s;
     *     animation-duration: 0s; &#42;/
     * }
     * .my-animation.ng-enter.ng-enter-active {
     *   /&#42; standard transition styles &#42;/
     *   opacity:1;
     * }
     * ```
     *
     * Staggering animations work by default in ngRepeat (so long as the CSS class is defined). Outside of ngRepeat, to use staggering animations
     * on your own, they can be triggered by firing multiple calls to the same event on $animate. However, the restrictions surrounding this
     * are that each of the elements must have the same CSS className value as well as the same parent element. A stagger operation
     * will also be reset if one or more animation frames have passed since the multiple calls to `$animate` were fired.
     *
     * The following code will issue the **ng-leave-stagger** event on the element provided:
     *
     * ```js
     * var kids = parent.children();
     *
     * $animate.leave(kids[0]); //stagger index=0
     * $animate.leave(kids[1]); //stagger index=1
     * $animate.leave(kids[2]); //stagger index=2
     * $animate.leave(kids[3]); //stagger index=3
     * $animate.leave(kids[4]); //stagger index=4
     *
     * window.requestAnimationFrame(function() {
     *   //stagger has reset itself
     *   $animate.leave(kids[5]); //stagger index=0
     *   $animate.leave(kids[6]); //stagger index=1
     *
     *   $scope.$digest();
     * });
     * ```
     *
     * Stagger animations are currently only supported within CSS-defined animations.
     *
     * ### The `ng-animate` CSS class
     *
     * When ngAnimate is animating an element it will apply the `ng-animate` CSS class to the element for the duration of the animation.
     * This is a temporary CSS class and it will be removed once the animation is over (for both JavaScript and CSS-based animations).
     *
     * Therefore, animations can be applied to an element using this temporary class directly via CSS.
     *
     * ```css
     * .zipper.ng-animate {
     *   transition:0.5s linear all;
     * }
     * .zipper.ng-enter {
     *   opacity:0;
     * }
     * .zipper.ng-enter.ng-enter-active {
     *   opacity:1;
     * }
     * .zipper.ng-leave {
     *   opacity:1;
     * }
     * .zipper.ng-leave.ng-leave-active {
     *   opacity:0;
     * }
     * ```
     *
     * (Note that the `ng-animate` CSS class is reserved and it cannot be applied on an element directly since ngAnimate will always remove
     * the CSS class once an animation has completed.)
     *
     *
     * ### The `ng-[event]-prepare` class
     *
     * This is a special class that can be used to prevent unwanted flickering / flash of content before
     * the actual animation starts. The class is added as soon as an animation is initialized, but removed
     * before the actual animation starts (after waiting for a $digest).
     * It is also only added for *structural* animations (`enter`, `move`, and `leave`).
     *
     * In practice, flickering can appear when nesting elements with structural animations such as `ngIf`
     * into elements that have class-based animations such as `ngClass`.
     *
     * ```html
     * <div ng-class="{red: myProp}">
     *   <div ng-class="{blue: myProp}">
     *     <div class="message" ng-if="myProp"></div>
     *   </div>
     * </div>
     * ```
     *
     * It is possible that during the `enter` animation, the `.message` div will be briefly visible before it starts animating.
     * In that case, you can add styles to the CSS that make sure the element stays hidden before the animation starts:
     *
     * ```css
     * .message.ng-enter-prepare {
     *   opacity: 0;
     * }
     *
     * ```
     *
     * ## 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) {
     *        // this will trigger `.slide.ng-enter` and `.slide.ng-enter-active`.
     *       return $animateCss(element, {
     *         event: 'enter',
     *         structural: true
     *       });
     *     }
     *   }
     * }]);
     * ```
     *
     * The nice thing here is that we can save bandwidth by sticking to our CSS-based animation code and we don't need to rely on a 3rd-party animation framework.
     *
     * The `$animateCss` service is very powerful since we can feed in all kinds of extra properties that will be evaluated and fed into a CSS transition or
     * keyframe animation. For example if we wanted to animate the height of an element while adding and removing classes then we can do so by providing that
     * data into `$animateCss` directly:
     *
     * ```js
     * myModule.animation('.slide', ['$animateCss', function($animateCss) {
     *   return {
     *     enter: function(element) {
     *       return $animateCss(element, {
     *         event: 'enter',
     *         structural: true,
     *         addClass: 'maroon-setting',
     *         from: { height:0 },
     *         to: { height: 200 }
     *       });
     *     }
     *   }
     * }]);
     * ```
     *
     * Now we can fill in the rest via our transition CSS code:
     *
     * ```css
     * /&#42; the transition tells ngAnimate to make the animation happen &#42;/
     * .slide.ng-enter { transition:0.5s linear all; }
     *
     * /&#42; this extra CSS class will be absorbed into the transition
     * since the $animateCss code is adding the class &#42;/
     * .maroon-setting { background:red; }
     * ```
     *
     * And `$animateCss` will figure out the rest. Just make sure to have the `done()` callback fire the `doneFn` function to signal when the animation is over.
     *
     * To learn more about what's possible be sure to visit the {@link ngAnimate.$animateCss $animateCss service}.
     *
     * ## Animation Anchoring (via `ng-animate-ref`)
     *
     * ngAnimate in AngularJS 1.4 comes packed with the ability to cross-animate elements between
     * structural areas of an application (like views) by pairing up elements using an attribute
     * called `ng-animate-ref`.
     *
     * Let's say for example we have two views that are managed by `ng-view` and we want to show
     * that there is a relationship between two components situated in within these views. By using the
     * `ng-animate-ref` attribute we can identify that the two components are paired together and we
     * can then attach an animation, which is triggered when the view changes.
     *
     * Say for example we have the following template code:
     *
     * ```html
     * <!-- index.html -->
     * <div ng-view class="view-animation">
     * </div>
     *
     * <!-- home.html -->
     * <a href="#/banner-page">
     *   <img src="./banner.jpg" class="banner" ng-animate-ref="banner">
     * </a>
     *
     * <!-- banner-page.html -->
     * <img src="./banner.jpg" class="banner" ng-animate-ref="banner">
     * ```
     *
     * Now, when the view changes (once the link is clicked), ngAnimate will examine the
     * HTML contents to see if there is a match reference between any components in the view
     * that is leaving and the view that is entering. It will scan both the view which is being
     * removed (leave) and inserted (enter) to see if there are any paired DOM elements that
     * contain a matching ref value.
     *
     * The two images match since they share the same ref value. ngAnimate will now create a
     * transport element (which is a clone of the first image element) and it will then attempt
     * to animate to the position of the second image element in the next view. For the animation to
     * work a special CSS class called `ng-anchor` will be added to the transported element.
     *
     * We can now attach a transition onto the `.banner.ng-anchor` CSS class and then
     * ngAnimate will handle the entire transition for us as well as the addition and removal of
     * any changes of CSS classes between the elements:
     *
     * ```css
     * .banner.ng-anchor {
     *   /&#42; this animation will last for 1 second since there are
     *          two phases to the animation (an `in` and an `out` phase) &#42;/
     *   transition:0.5s linear all;
     * }
     * ```
     *
     * We also **must** include animations for the views that are being entered and removed
     * (otherwise anchoring wouldn't be possible since the new view would be inserted right away).
     *
     * ```css
     * .view-animation.ng-enter, .view-animation.ng-leave {
     *   transition:0.5s linear all;
     *   position:fixed;
     *   left:0;
     *   top:0;
     *   width:100%;
     * }
     * .view-animation.ng-enter {
     *   transform:translateX(100%);
     * }
     * .view-animation.ng-leave,
     * .view-animation.ng-enter.ng-enter-active {
     *   transform:translateX(0%);
     * }
     * .view-animation.ng-leave.ng-leave-active {
     *   transform:translateX(-100%);
     * }
     * ```
     *
     * Now we can jump back to the anchor animation. When the animation happens, there are two stages that occur:
     * an `out` and an `in` stage. The `out` stage happens first and that is when the element is animated away
     * from its origin. Once that animation is over then the `in` stage occurs which animates the
     * element to its destination. The reason why there are two animations is to give enough time
     * for the enter animation on the new element to be ready.
     *
     * The example above sets up a transition for both the in and out phases, but we can also target the out or
     * in phases directly via `ng-anchor-out` and `ng-anchor-in`.
     *
     * ```css
     * .banner.ng-anchor-out {
     *   transition: 0.5s linear all;
     *
     *   /&#42; the scale will be applied during the out animation,
     *          but will be animated away when the in animation runs &#42;/
     *   transform: scale(1.2);
     * }
     *
     * .banner.ng-anchor-in {
     *   transition: 1s linear all;
     * }
     * ```
     *
     *
     *
     *
     * ### Anchoring Demo
     *
     <example module="anchoringExample"
     name="anchoringExample"
     id="anchoringExample"
     deps="angular-animate.js;angular-route.js"
     animations="true">
     <file name="index.html">
     <a href="#!/">Home</a>
     <hr />
     <div class="view-container">
     <div ng-view class="view"></div>
     </div>
     </file>
     <file name="script.js">
     angular.module('anchoringExample', ['ngAnimate', 'ngRoute'])
     .config(['$routeProvider', function($routeProvider) {
          $routeProvider.when('/', {
            templateUrl: 'home.html',
            controller: 'HomeController as home'
          });
          $routeProvider.when('/profile/:id', {
            templateUrl: 'profile.html',
            controller: 'ProfileController as profile'
          });
        }])
     .run(['$rootScope', function($rootScope) {
          $rootScope.records = [
            { id: 1, title: 'Miss Beulah Roob' },
            { id: 2, title: 'Trent Morissette' },
            { id: 3, title: 'Miss Ava Pouros' },
            { id: 4, title: 'Rod Pouros' },
            { id: 5, title: 'Abdul Rice' },
            { id: 6, title: 'Laurie Rutherford Sr.' },
            { id: 7, title: 'Nakia McLaughlin' },
            { id: 8, title: 'Jordon Blanda DVM' },
            { id: 9, title: 'Rhoda Hand' },
            { id: 10, title: 'Alexandrea Sauer' }
          ];
        }])
     .controller('HomeController', [function() {
          //empty
        }])
     .controller('ProfileController', ['$rootScope', '$routeParams',
     function ProfileController($rootScope, $routeParams) {
          var index = parseInt($routeParams.id, 10);
          var record = $rootScope.records[index - 1];

          this.title = record.title;
          this.id = record.id;
        }]);
     </file>
     <file name="home.html">
     <h2>Welcome to the home page</h1>
     <p>Please click on an element</p>
     <a class="record"
     ng-href="#!/profile/{{ record.id }}"
     ng-animate-ref="{{ record.id }}"
     ng-repeat="record in records">
     {{ record.title }}
     </a>
     </file>
     <file name="profile.html">
     <div class="profile record" ng-animate-ref="{{ profile.id }}">
     {{ profile.title }}
     </div>
     </file>
     <file name="animations.css">
     .record {
        display:block;
        font-size:20px;
      }
     .profile {
        background:black;
        color:white;
        font-size:100px;
      }
     .view-container {
        position:relative;
      }
     .view-container > .view.ng-animate {
        position:absolute;
        top:0;
        left:0;
        width:100%;
        min-height:500px;
      }
     .view.ng-enter, .view.ng-leave,
     .record.ng-anchor {
        transition:0.5s linear all;
      }
     .view.ng-enter {
        transform:translateX(100%);
      }
     .view.ng-enter.ng-enter-active, .view.ng-leave {
        transform:translateX(0%);
      }
     .view.ng-leave.ng-leave-active {
        transform:translateX(-100%);
      }
     .record.ng-anchor-out {
        background:red;
      }
     </file>
     </example>
     *
     * ### How is the element transported?
     *
     * When an anchor animation occurs, ngAnimate will clone the starting element and position it exactly where the starting
     * element is located on screen via absolute positioning. The cloned element will be placed inside of the root element
     * of the application (where ng-app was defined) and all of the CSS classes of the starting element will be applied. The
     * element will then animate into the `out` and `in` animations and will eventually reach the coordinates and match
     * the dimensions of the destination element. During the entire animation a CSS class of `.ng-animate-shim` will be applied
     * to both the starting and destination elements in order to hide them from being visible (the CSS styling for the class
     * is: `visibility:hidden`). Once the anchor reaches its destination then it will be removed and the destination element
     * will become visible since the shim class will be removed.
     *
     * ### How is the morphing handled?
     *
     * CSS Anchoring relies on transitions and keyframes and the internal code is intelligent enough to figure out
     * what CSS classes differ between the starting element and the destination element. These different CSS classes
     * will be added/removed on the anchor element and a transition will be applied (the transition that is provided
     * in the anchor class). Long story short, ngAnimate will figure out what classes to add and remove which will
     * make the transition of the element as smooth and automatic as possible. Be sure to use simple CSS classes that
     * do not rely on DOM nesting structure so that the anchor element appears the same as the starting element (since
     * the cloned element is placed inside of root element which is likely close to the body element).
     *
     * Note that if the root element is on the `<html>` element then the cloned node will be placed inside of body.
     *
     *
     * ## Using $animate in your directive code
     *
     * So far we've explored how to feed in animations into an Angular application, but how do we trigger animations within our own directives in our application?
     * By injecting the `$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.)
     */

    var copy;
    var extend;
    var forEach;
    var isArray;
    var isDefined;
    var isElement;
    var isFunction;
    var isObject;
    var isString;
    var isUndefined;
    var jqLite;
    var noop;

    /**
     * @ngdoc service
     * @name $animate
     * @kind object
     *
     * @description
     * The ngAnimate `$animate` service documentation is the same for the core `$animate` service.
     *
     * Click here {@link ng.$animate to learn more about animations with `$animate`}.
     */
    angular.module('ngAnimate', [], function initAngularHelpers() {
        // Access helpers from angular core.
        // Do it inside a `config` block to ensure `window.angular` is available.
        noop = angular.noop;
        copy = angular.copy;
        extend = angular.extend;
        jqLite = angular.element;
        forEach = angular.forEach;
        isArray = angular.isArray;
        isString = angular.isString;
        isObject = angular.isObject;
        isUndefined = angular.isUndefined;
        isDefined = angular.isDefined;
        isFunction = angular.isFunction;
        isElement = angular.isElement;
    })
        .info({angularVersion: '1.6.5'})
        .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);