code: public function getParameters()
      {
          $arrParams = [];
  
          preg_match_all('@\{\{param::filter\?([^}]*)\}\}@', $this->get('customsql'), $arrMatches);
          foreach ($arrMatches[1] as $strQuery) {
              parse_str($strQuery, $arrArgs);
              if (isset($arrArgs['name'])) {
                  $arrName     = (array) $arrArgs['name'];
                  $arrParams[] = $arrName[0];
              }
          }
  
          return $arrParams;
      }
docs: {@inheritDoc}