private function getControlTokens()
{
static $tokens = null;
if (null === $tokens) {
$tokens = array(T_DECLARE, T_DO, T_ELSE, T_ELSEIF, T_FOR, T_FOREACH, T_IF, T_WHILE, T_TRY, T_CATCH, T_SWITCH);
if (defined('T_FINALLY')) {
$tokens[] = T_FINALLY;
}
}
return $tokens;
}