/**
* @param NodeList $nodelist
* @param string|null $parent_name
* @param FilterExpression|null $parent_name_expr
* @param array|null $template_dirs
*/
public function __construct($nodelist, $parent_name, $parent_name_expr, $template_dirs = null)
{
$this->nodelist = $nodelist;
$this->parent_name = $parent_name;
$this->parent_name_expr = $parent_name_expr;
$this->template_dirs = $template_dirs;
$blocks_ = array();
foreach ($nodelist->getNodesByType('BlockNode') as $n) {
$blocks_[$n->name] = $n;
}
$this->blocks = $blocks_;
}