Neos\Neos\Service\LinkingService::convertUriToObject PHP Method

    public function convertUriToObject($uri, NodeInterface $contextNode = null)
    {
        if ($uri instanceof Uri) {
            $uri = (string) $uri;
        }
        if (preg_match(self::PATTERN_SUPPORTED_URIS, $uri, $matches) === 1) {
            switch ($matches[1]) {
                case 'node':
                    if ($contextNode === null) {
                        throw new \RuntimeException('node:// URI conversion requires a context node to be passed', 1409734235);
                    }
                    return $contextNode->getContext()->getNodeByIdentifier($matches[2]);
                case 'asset':
                    return $this->assetRepository->findByIdentifier($matches[2]);
            }
        }
        return null;
    }

 /**
  * Resolves a shortcut node to the target. The return value can be
  *
  * * a NodeInterface instance if the target is a node or a node:// URI
  * * a string (in case the target is a plain text URI or an asset:// URI)
  * * NULL in case the shortcut cannot be resolved
  *
  * @param NodeInterface $node
  * @return NodeInterface|string|NULL
  */
 public function resolveShortcutTarget(NodeInterface $node)
 {
     $infiniteLoopPrevention = 0;
     while ($node->getNodeType()->isOfType('Neos.Neos:Shortcut') && $infiniteLoopPrevention < 50) {
         $infiniteLoopPrevention++;
         switch ($node->getProperty('targetMode')) {
             case 'selectedTarget':
                 $target = $node->getProperty('target');
                 if ($this->linkingService->hasSupportedScheme($target)) {
                     $targetObject = $this->linkingService->convertUriToObject($target, $node);
                     if ($targetObject instanceof NodeInterface) {
                         $node = $targetObject;
                     } elseif ($targetObject instanceof AssetInterface) {
                         return $this->linkingService->resolveAssetUri($target);
                     }
                 } else {
                     return $target;
                 }
                 break;
             case 'parentNode':
                 $node = $node->getParent();
                 break;
             case 'firstChildNode':
             default:
                 $childNodes = $node->getChildNodes('Neos.Neos:Document');
                 if ($childNodes !== array()) {
                     $node = reset($childNodes);
                 } else {
                     return null;
                 }
         }
     }
     return $node;
 }