Function performAnimation

test/angular/1.2/angular-animate.js:827–1032

(animationEvent, className, element, parentElement, afterElement, domOperation, doneCallback)

        and the onComplete callback will be fired once the animation is fully complete.
      */
      function performAnimation(animationEvent, className, element, parentElement, afterElement, domOperation, doneCallback) {

        var runner = animationRunner(element, animationEvent, className);
        if(!runner) {
          fireDOMOperation();
          fireBeforeCallbackAsync();
          fireAfterCallbackAsync();
          closeAnimation();
          return;
        }

        className = runner.className;
        var elementEvents = angular.element._data(runner.node);
        elementEvents = elementEvents && elementEvents.events;

        if (!parentElement) {
          parentElement = afterElement ? afterElement.parent() : element.parent();
        }

        var ngAnimateState  = element.data(NG_ANIMATE_STATE) || {};
        var runningAnimations     = ngAnimateState.active || {};
        var totalActiveAnimations = ngAnimateState.totalActive || 0;
        var lastAnimation         = ngAnimateState.last;

        //only allow animations if the currently running animation is not structural
        //or if there is no animation running at all
        var skipAnimations;
        if (runner.isClassBased) {
          skipAnimations = ngAnimateState.running ||
                           ngAnimateState.disabled ||
                           (lastAnimation && !lastAnimation.isClassBased);
        }

        //skip the animation if animations are disabled, a parent is already being animated,
        //the element is not currently attached to the document body or then completely close
        //the animation if any matching animations are not found at all.
        //NOTE: IE8 + IE9 should close properly (run closeAnimation()) in case an animation was found.
        if (skipAnimations || animationsDisabled(element, parentElement)) {
          fireDOMOperation();
          fireBeforeCallbackAsync();
          fireAfterCallbackAsync();
          closeAnimation();
          return;
        }

        var skipAnimation = false;
        if(totalActiveAnimations > 0) {
          var animationsToCancel = [];
          if(!runner.isClassBased) {
            if(animationEvent == 'leave' && runningAnimations['ng-leave']) {
              skipAnimation = true;
            } else {
              //cancel all animations when a structural animation takes place
              for(var klass in runningAnimations) {
                animationsToCancel.push(runningAnimations[klass]);
                cleanup(element, klass);
              }
              runningAnimations = {};