/**
* Create a Statusdat expression from a Tree node
*
* @param Node $node The node to convert to an expression
* @param Filterable $source The filterable to use for field mapping
*
* @return IQueryPart Either a statusdat expression or an expression group
*/
private function nodeToQuery(Node $node, Filterable $source)
{
if ($node->type === Node::TYPE_OPERATOR) {
$op = $node->operator;
$node->left = $source->getMappedField($node->left);
$op = 'IN';
$values = $node->right;
if ($node->operator === NODE::OPERATOR_EQUALS_NOT) {
$op = 'NOT_' . $op;
}
foreach ($values as &$value) {
$value = str_replace('*', '%', $value);
}
$values = array($values);
return new Expression($node->left . ' ' . $op . ' ? ', $values);
} else {
$group = new Group();
$group->setType($node->type === Node::TYPE_OR ? Group::TYPE_OR : Group::TYPE_AND);
$group->addItem($this->nodeToQuery($node->left, $source));
$group->addItem($this->nodeToQuery($node->right, $source));
return $group;
}
}
/**
* Remove all tree nodes that are not applicable ot the given Filterable
*
* @param Node $node The root node to use
* @param Filterable $filter The Filterable to test nodes against
* @return Node The normalized tree node
*/
public function removeInvalidFilter($node, Filterable $filter)
{
if ($node === null) {
return $node;
}
if ($node->type === Node::TYPE_OPERATOR) {
if (!$filter->isValidFilterTarget($node->left)) {
return null;
} else {
return $node;
}
}
$node->left = $this->removeInvalidFilter($node->left, $filter);
$node->right = $this->removeInvalidFilter($node->right, $filter);
if ($node->left || $node->right) {
if (!$node->left) {
$node->left = $node->right;
$node->right = null;
}
return $node;
}
return null;
}