Imported code from old repository

classes/CustomValidationVisitor.php

@@ -0,0 +1,32 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\PhpMAE;
+
+use PHPSandbox\PHPSandbox;
+use PhpParser\Node, PhpParser\NodeVisitorAbstract;
+
+/**
+ * Performs additional sandbox validation steps which are specific to phpMAE and
+ * not implemented in a compatible way in the PHPSandbox library.
+ */
+class CustomValidationVisitor extends NodeVisitorAbstract {
+
+    protected $sandbox;
+
+    public function __construct(PHPSandbox $sandbox) {
+        $this->sandbox = $sandbox;
+    }
+
+    public function leaveNode(Node $node) {
+        if ($node instanceof Node\Expr\FuncCall) {
+            if ($node->name instanceof Node\Expr\Variable) {
+                $this->sandbox->validationError("Sandboxed code attempted to call a variable method!", 0, $node);
+            }
+        }
+    }
+
+}