/**
* @param nc_search_query_expression_composite $expression
* @return array
*/
protected function translate_items(nc_search_query_expression_composite $expression)
{
$type_of_expression = str_replace("nc_search_query_expression_", "", get_class($expression));
$this->stack[] = $type_of_expression;
$result = parent::translate_items($expression);
$result = array_filter($result, 'strlen');
// remove empty entries
array_pop($this->stack);
return $result;
}
/**
* @param nc_search_query_translator $translator
* @return mixed
*/
public function translate(nc_search_query_translator $translator)
{
return $translator->translate($this);
}
