Return TRUE if this style uses tokens.
Used to ensure we don't fetch tokens when not needed for performance.
function uses_tokens() {
if ($this
->usesRowClass()) {
$class = $this->options['row_class'];
if (strpos($class, '[') !== FALSE || strpos($class, '!') !== FALSE || strpos($class, '%') !== FALSE) {
return TRUE;
}
}
}