/**
* Parse the table of contents file and populate nav data
*/
public function parse()
{
$this->navData = array();
$doc = new ChaucerDomDocument();
$doc->loadHTMLFile($this->path);
$xpath = new DOMXpath($doc);
$xpath->registerNamespace('epub', 'http://www.idpf.org/2007/ops');
$parentElements = $xpath->query("//nav");
if (!is_null($parentElements)) {
foreach ($parentElements as $parentNode) {
if ($parentNode->getAttribute('epub:type') == 'toc') {
$this->navData = $this->parseTocNode($parentNode, $xpath, 0, 0);
}
}
}
}
