/**
* Creates a syntax tree for an arry or an epObject
* @param array|epObject &$v
* @param string $prefix
* @return false|epQueryNode
*/
protected function &_createSyntaxNodes(&$v, $prefix)
{
$nodes = array();
// create expression for primitve vars from array or object
if (!($exprs = $this->_getPrimitiveExprs($v, $prefix))) {
return $nodes;
}
// create comparison '=' nodes
foreach ($exprs as $path => $value) {
// insert path into tree
if (!$this->pm->insertPath($path)) {
// should not happen
continue;
}
// create a comparison node
if (!($node = new epQueryNode(EPQ_N_EXPR_COMPARISON))) {
// should not happen
continue;
}
// set operator '='
$node->setParam('op', '=');
// create left hand side variable
if (!($left = new epQueryNode(EPQ_N_VARIABLE))) {
// should not happen
continue;
}
// set param path
$left->setParam('path', $path);
// add left hand side
$node->addChild($left, 'left');
// create right hand side value
if (!($right = new epQueryNode(EPQ_N_STRING))) {
// should not happen
continue;
}
$right->setParam('val', $value);
// add left hand side
$node->addChild($right, 'right');
// collect node
$nodes[] = $node;
}
return $nodes;
}
/**
* Create a new node and set it as the current node
* @return epQueryNode
*/
protected function node($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;
}
