/**
* Create a new node and set it as the current node
* @return epQueryNode
*/
protected function node($type)
{
// create a node with type
$this->n = new epQueryNode($type);
// set line and char
if (isset($this->t) && isset($this->t->line)) {
$this->n->setParam('line', $this->t->line);
}
if (isset($this->t) && isset($this->t->char)) {
$this->n->setParam('char', $this->t->char);
}
// return this node
return $this->n;
}
/**
* Call children's SQL builders
* @param epQueryNode &$node
* @param string $seperator
* @param boolean $use_parentheses Whether to use parentheses around child results
* @return boolean
*/
protected function _buildSqlChildren(epQueryNode &$node, $seperator = ' ', $use_parentheses = false)
{
$results = array();
if ($children = $node->getChildren()) {
foreach ($children as &$child) {
if ($result = $this->buildSql($child)) {
$results[] = $result;
}
}
}
// use parentheses only when we have more than one child results
if ($use_parentheses && count($results) > 1) {
foreach ($results as $k => $result) {
$results[$k] = '(' . $result . ')';
}
}
return implode($seperator, $results);
}
/**
* Call children's SQL builders
* @return boolean
*/
protected function _buildSqlChildren(epQueryNode &$node, $seperator = ' ')
{
$results = array();
if ($children = $node->getChildren()) {
foreach ($children as &$child) {
$results[] = $this->buildSql($child);
}
}
return implode($seperator, $results);
}
