comparison vendor/twig/twig/src/NodeTraverser.php @ 5:12f9dff5fda9 tip

Update to Drupal core 8.7.1

 <?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
 
 namespace Twig;
 
-class_exists('Twig_NodeTraverser');
+use Twig\NodeVisitor\NodeVisitorInterface;
 
-if (\false) {
-    class NodeTraverser extends \Twig_NodeTraverser
+/**
+ * A node traverser.
+ *
+ * It visits all nodes and their children and calls the given visitor for each.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <[e-mail]>
+ */
+class NodeTraverser
+{
+    protected $env;
+    protected $visitors = [];
+
+    /**
+     * @param NodeVisitorInterface[] $visitors
+     */
+    public function __construct(Environment $env, array $visitors = [])
     {
+        $this->env = $env;
+        foreach ($visitors as $visitor) {
+            $this->addVisitor($visitor);
+        }
+    }
+
+    public function addVisitor(NodeVisitorInterface $visitor)
+    {
+        $this->visitors[$visitor->getPriority()][] = $visitor;
+    }
+
+    /**
+     * Traverses a node and calls the registered visitors.
+     *
+     * @return \Twig_NodeInterface
+     */
+    public function traverse(\Twig_NodeInterface $node)
+    {
+        ksort($this->visitors);
+        foreach ($this->visitors as $visitors) {
+            foreach ($visitors as $visitor) {
+                $node = $this->traverseForVisitor($visitor, $node);
+            }
+        }
+
+        return $node;
+    }
+
+    protected function traverseForVisitor(NodeVisitorInterface $visitor, \Twig_NodeInterface $node = null)
+    {
+        if (null === $node) {
+            return;
+        }
+
+        $node = $visitor->enterNode($node, $this->env);
+
+        foreach ($node as $k => $n) {
+            if (null === $n) {
+                continue;
+            }
+
+            if (false !== ($m = $this->traverseForVisitor($visitor, $n)) && null !== $m) {
+                if ($m !== $n) {
+                    $node->setNode($k, $m);
+                }
+            } else {
+                $node->removeNode($k);
+            }
+        }
+
+        return $visitor->leaveNode($node, $this->env);
     }
 }
+
+class_alias('Twig\NodeTraverser', 'Twig_NodeTraverser');