protected function _andQuery()
{
$query = new Node\Query('AND');
$leftTerm = $this->_term();
$query->add($leftTerm);
while ($this->_tokenStream->look()->getType() === 'AND') {
$this->_tokenStream->expect('AND');
$rightTerm = $this->_term();
$query->add($rightTerm);
}
return $query;
}
protected function _optimize(Node\Query $query)
{
$terms = $query->getTerms();
$termCount = count($terms);
$subQueries = $query->getSubQueries();
$subQueryCount = count($subQueries);
// Only contains a single term
if ($subQueryCount === 0 && $termCount === 1) {
return $terms[0];
} else {
if ($subQueryCount == 1 && $termCount === 0) {
return $this->_optimize($subQueries[0]);
} else {
$newQuery = new Node\Query($query->getOperator());
foreach ($terms as $term) {
$newQuery->addTerm($term);
}
foreach ($subQueries as $subQuery) {
$newQuery->add($this->_optimize($subQuery));
}
return $newQuery;
}
}
}