Function executeAnimationFn

test/angular/1.5/angular-animate.js:1927–1968

(fn, element, event, options, onDone)

      };

      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 = [];