protected function processUnion($tokens)
{
// this is the highest level lexical analysis. This is the part of the
// code which finds UNION and UNION ALL query parts
$processor = new UnionProcessor();
return $processor->process($tokens);
}
public function process($sql)
{
$inputArray = $this->splitSQLIntoTokens($sql);
// this is the highest level lexical analysis. This is the part of the
// code which finds UNION and UNION ALL query parts
$processor = new UnionProcessor();
$queries = $processor->process($inputArray);
// If there was no UNION or UNION ALL in the query, then the query is
// stored at $queries[0].
if (!$processor->isUnion($queries)) {
$processor = new SQLProcessor();
$queries = $processor->process($queries[0]);
}
return $queries;
}