comparison vendor/nikic/php-parser/lib/PhpParser/NodeVisitor/FirstFindingVisitor.php @ 13:5fb285c0d0e3

Update Drupal core to 8.4.7 via Composer. Security update; I *think* we've
been lucky to get away with this so far, as we don't support self-registration
which seems to be used by the so-called "drupalgeddon 2" attack that 8.4.5
was vulnerable to.

+<?php declare(strict_types=1);
+
+namespace PhpParser\NodeVisitor;
+
+use PhpParser\Node;
+use PhpParser\NodeTraverser;
+use PhpParser\NodeVisitorAbstract;
+
+/**
+ * This visitor can be used to find the first node satisfying some criterion determined by
+ * a filter callback.
+ */
+class FirstFindingVisitor extends NodeVisitorAbstract
+{
+    /** @var callable Filter callback */
+    protected $filterCallback;
+    /** @var null|Node Found node */
+    protected $foundNode;
+
+    public function __construct(callable $filterCallback) {
+        $this->filterCallback = $filterCallback;
+    }
+
+    /**
+     * Get found node satisfying the filter callback.
+     *
+     * Returns null if no node satisfies the filter callback.
+     *
+     * @return null|Node Found node (or null if not found)
+     */
+    public function getFoundNode() {
+        return $this->foundNode;
+    }
+
+    public function beforeTraverse(array $nodes) {
+        $this->foundNode = null;
+
+        return null;
+    }
+
+    public function enterNode(Node $node) {
+        $filterCallback = $this->filterCallback;
+        if ($filterCallback($node)) {
+            $this->foundNode = $node;
+            return NodeTraverser::STOP_TRAVERSAL;
+        }
+
+        return null;
+    }
+}