Craft\AmNavService::_setActiveNodes PHP Method

    private function _setActiveNodes($nodes)
    {
        $path = craft()->request->getPath();
        $segments = craft()->request->getSegments();
        $segmentCount = count($segments) > 0 ? count($segments) : 1;
        // Set empty array for specific navigation
        $this->_activeNodeIds[$this->_navigation->handle] = array();
        $this->_activeNodeIdsForLevel[$this->_navigation->handle] = array();
        foreach ($nodes as $node) {
            $url = !empty($node['elementId']) ? $node['elementUrl'] : $node['url'];
            $url = str_replace('{siteUrl}', '', $url);
            $url = str_replace('__home__', '', $url);
            if (substr($url, 0, 1) == '/') {
                $url = substr($url, 1);
                // Fix for relative URLs
            }
            if ($url == $path) {
                $this->_activeNodeIds[$this->_navigation->handle][] = $node['id'];
                $this->_activeNodeIdsForLevel[$this->_navigation->handle][$segmentCount] = $node['id'];
            }
            if (count($segments)) {
                $found = false;
                $count = 1;
                // Start at second
                $segmentString = $segments[0];
                // Add first
                while ($count < count($segments)) {
                    if ($url == $segmentString) {
                        $found = true;
                        break;
                    }
                    $segmentString .= '/' . $segments[$count];
                    $count++;
                }
                if ($found) {
                    $this->_activeNodeIds[$this->_navigation->handle][] = $node['id'];
                    $this->_activeNodeIdsForLevel[$this->_navigation->handle][$count] = $node['id'];
                }
            }
        }
    }