/**
* Returns a list of valid targets for a given rule.
*
* @param $rule
* @return array [string]
* @throws \invalid_parameter_exception
*/
public static function get_targets($rule)
{
$params = self::validate_parameters(self::get_targets_parameters(), array('rule' => $rule));
$obj = \tool_cat\rule::create_rule($params['rule']);
$keys = $obj->get_supported_targets();
// Prettify.
$values = array_map(function ($str) {
$str = str_replace('_', ' ', $str);
return ucwords($str);
}, $keys);
return array_combine($keys, $values);
}
