[as2] Functionの呼び出し元（caller）のスコープを調べる

class FunctionUtil
{
  public static function getCallerScope( func:Function , scope:Object ):Object
  {
    if( scope==undefined ) scope = _root;
    var maxLevel = 4;
    var level = (arguments[2]==undefined)? 0 : arguments[2];
    if( func ){
      for(var val in scope){
        if( typeof( scope[val] )=="function" ){
          if( scope[val]==func ){
            return { scope:scope , functionName:val };
          }
        } else {
          if(level<maxLevel){
            if( typeof( scope[val] )=="movieclip" || typeof( scope[val] )=="object" ){
              var res = getCallerScope( func , scope[val] , level+1 );
              if( res ) return res;
            }
          }
        }
      }
    }
    return null;
  }
}

function calleeFunc()
{
  var res = FunctionUtil.getCallerScope( arguments.caller , this._parent );
  trace(res.scope);
  trace(res.functionName);
}