Function animationRunner

test/angular/1.3/angular-animate.js:634–797

(element, animationEvent, className, options)

      }

      function animationRunner(element, animationEvent, className, options) {
        //transcluded directives may sometimes fire an animation using only comment nodes
        //best to catch this early on to prevent any animation operations from occurring
        var node = element[0];
        if (!node) {
          return;
        }

        if (options) {
          options.to = options.to || {};
          options.from = options.from || {};
        }

        var classNameAdd;
        var classNameRemove;
        if (isArray(className)) {
          classNameAdd = className[0];
          classNameRemove = className[1];
          if (!classNameAdd) {
            className = classNameRemove;
            animationEvent = 'removeClass';
          } else if (!classNameRemove) {
            className = classNameAdd;
            animationEvent = 'addClass';
          } else {
            className = classNameAdd + ' ' + classNameRemove;
          }
        }

        var isSetClassOperation = animationEvent == 'setClass';
        var isClassBased = isSetClassOperation
                           || animationEvent == 'addClass'
                           || animationEvent == 'removeClass'
                           || animationEvent == 'animate';

        var currentClassName = element.attr('class');
        var classes = currentClassName + ' ' + className;
        if (!isAnimatableClassName(classes)) {
          return;
        }

        var beforeComplete = noop,
            beforeCancel = [],
            before = [],
            afterComplete = noop,
            afterCancel = [],
            after = [];

        var animationLookup = (' ' + classes).replace(/\s+/g,'.');
        forEach(lookup(animationLookup), function(animationFactory) {
          var created = registerAnimation(animationFactory, animationEvent);
          if (!created && isSetClassOperation) {
            registerAnimation(animationFactory, 'addClass');
            registerAnimation(animationFactory, 'removeClass');
          }
        });

        function registerAnimation(animationFactory, event) {