/**
* Parses the order by clause and transforms it into AST
* @param string $orderByClause
* @return \Doctrine\ORM\Query\AST\OrderByClause
*/
protected function parseOrderByClause($orderByClause)
{
if ($orderByClause === '') {
return new \Doctrine\ORM\Query\AST\OrderByClause([]);
// Empty order by ===> RETURN
}
// We use the doctrine DQL parser here.
// Fortunately the function OrderByClause is public, thus we can call it directly.
// Let's hope that it stays public and never breaks
$dummyQuery = $this->_getQuery()->getEntityManager()->createQuery('order by ' . $orderByClause);
$parser = new \Doctrine\ORM\Query\Parser($dummyQuery);
$parser->getLexer()->moveNext();
// Move to first token
return $parser->OrderByClause();
}
