parse down MovieClip recursively

gistfile1.as

package  
{
    import flash.display.DisplayObject;
    import flash.display.Loader;
    import flash.display.MovieClip;
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    import flash.net.URLRequest;
    import flash.text.TextField;
    /**
     * ...
     * @author kobayashi-taro
     */
    public class test extends Sprite
    {
        
        public function test() 
        {
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            var tf:TextField = new TextField;
            tf.width = stage.stageWidth;
            tf.height = stage.stageHeight;
            addChild(tf);
            
            var id:String = loaderInfo.parameters.swf_id || '01';
            var ldr:Loader = new Loader;
            ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, function _onLoaded(event:Event):void {
                ldr.contentLoaderInfo.removeEventListener(Event.COMPLETE, _onLoaded);
                tf.text = parseMovieClip(ldr.content as MovieClip);
            });
            ldr.load(new URLRequest(id+'.swf'));
        }
        
        private function parseMovieClip(mc:MovieClip, level:int = 0):String {
            var numChildren:int = mc.numChildren;
            var child:DisplayObject;
            var childMC:MovieClip;
            var childInfo:Array = [];
            for (var i:int = 0; i < numChildren; ++i) {
                child = mc.getChildAt(i);
                if (child is MovieClip) {
                    childMC = child as MovieClip;
                    childInfo.push(
                        getSpaces(level << 2) + childMC.name
                    );
                    childInfo = childInfo.concat(parseMovieClip(childMC, level + 1));
                }
            }
            
            return childInfo.join('\n');
        }
        
        private function getSpaces(count:int):String {
            return new Array(count)
                .map(function (...r):String { return " "; })
                .join('');
        }
    }

}