protected function aggregateResult($result,$delta)
{
    list($token,$calls,$min,$max,$total)=$result;
    if($delta<$min)
        $min=$delta;
    elseif($delta>$max)
        $max=$delta;
    $calls++;
    $total+=$delta;
    return array($token,$calls,$min,$max,$total);
}

protected function displayCallstack($logs)
{
    $stack=array();
    $results=array();
    $n=0;
    foreach($logs as $log)
    {
        if($log[1]!==CLogger::LEVEL_PROFILE)
            continue;
        $message=$log[0];
        if(!strncasecmp($message,'begin:',6))
        {
            $log[0]=substr($message,6);
            $log[4]=$n;
            $stack[]=$log;
            $n++;
        }
        elseif(!strncasecmp($message,'end:',4))
        {
            $token=substr($message,4);
            if(($last=array_pop($stack))!==null && $last[0]===$token)
            {
                $delta=$log[3]-$last[3];
                $results[$last[4]]=array($token,$delta,count($stack));
            }
            else
                throw new CException(Yii::t('yii','CProfileLogRoute found a mismatching code block "{token}". Make sure the calls to Yii::beginProfile() and Yii::endProfile() be properly nested.',
                    array('{token}'=>$token)));
        }
    }
    // remaining entries should be closed here
    $now=microtime(true);
    while(($last=array_pop($stack))!==null)
        $results[$last[4]]=array($last[0],$now-$last[3],count($stack));
    ksort($results);
    $this->render('profile-callstack',$results);
}

protected function displaySummary($logs)
{
    $stack=array();
    $results=array();
    foreach($logs as $log)
    {
        if($log[1]!==CLogger::LEVEL_PROFILE)
            continue;
        $message=$log[0];
        if(!strncasecmp($message,'begin:',6))
        {
            $log[0]=substr($message,6);
            $stack[]=$log;
        }
        elseif(!strncasecmp($message,'end:',4))
        {
            $token=substr($message,4);
            if(($last=array_pop($stack))!==null && $last[0]===$token)
            {
                $delta=$log[3]-$last[3];
                if(!$this->groupByToken)
                    $token=$log[2];
                if(isset($results[$token]))
                    $results[$token]=$this->aggregateResult($results[$token],$delta);
                else
                    $results[$token]=array($token,1,$delta,$delta,$delta);
            }
            else
                throw new CException(Yii::t('yii','CProfileLogRoute found a mismatching code block "{token}". Make sure the calls to Yii::beginProfile() and Yii::endProfile() be properly nested.',
                    array('{token}'=>$token)));
        }
    }

    $now=microtime(true);
    while(($last=array_pop($stack))!==null)
    {
        $delta=$now-$last[3];
        $token=$this->groupByToken ? $last[0] : $last[2];
        if(isset($results[$token]))
            $results[$token]=$this->aggregateResult($results[$token],$delta);
        else
            $results[$token]=array($token,1,$delta,$delta,$delta);
    }

    $entries=array_values($results);
    $func=create_function('$a,$b','return $a[4]<$b[4]?1:0;');
    usort($entries,$func);

    $this->render('profile-summary',$entries);
}

public function getReport()
{
    return $this->_report;
}

public function init()
{
    $this->levels=CLogger::LEVEL_PROFILE;
}

public function processLogs($logs)
{
    $app=Yii::app();
    if(!($app instanceof CWebApplication) || $app->getRequest()->getIsAjaxRequest())
        return;

    if($this->getReport()==='summary')
        $this->displaySummary($logs);
    else
        $this->displayCallstack($logs);
}

public function setReport($value)
{
    if($value==='summary' || $value==='callstack')
        $this->_report=$value;
    else
        throw new CException(Yii::t('yii','CProfileLogRoute.report "{report}" is invalid. Valid values include "summary" and "callstack".',
            array('{report}'=>$value)));
}