protected static function detectMode()
{
self::$_jsMode = false;
self::$_cssMode = false;
foreach (self::$_files as $file) {
switch ($file['ext']) {
case 'js':
self::$_jsMode = true;
break;
case 'css':
self::$_cssMode = true;
break;
}
if (self::$_jsMode !== false && self::$_cssMode !== false) {
break;
}
}
}