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vendor/psy/psysh/src/CodeCleaner/FinalClassPass.php

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+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2022 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * The final class pass handles final classes.
+ */
+class FinalClassPass extends CodeCleanerPass
+{
+    private $finalClasses;
+
+    /**
+     * @param array $nodes
+     *
+     * @return Node[]|null Array of nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->finalClasses = [];
+    }
+
+    /**
+     * @throws FatalErrorException if the node is a class that extends a final class
+     *
+     * @param Node $node
+     *
+     * @return int|Node|null Replacement node (or special return value)
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof Class_) {
+            if ($node->extends) {
+                $extends = (string) $node->extends;
+                if ($this->isFinalClass($extends)) {
+                    $msg = \sprintf('Class %s may not inherit from final class (%s)', $node->name, $extends);
+                    throw new FatalErrorException($msg, 0, \E_ERROR, null, $node->getLine());
+                }
+            }
+
+            if ($node->isFinal()) {
+                $this->finalClasses[\strtolower($node->name)] = true;
+            }
+        }
+    }
+
+    /**
+     * @param string $name Class name
+     *
+     * @return bool
+     */
+    private function isFinalClass(string $name): bool
+    {
+        if (!\class_exists($name)) {
+            return isset($this->finalClasses[\strtolower($name)]);
+        }
+
+        $refl = new \ReflectionClass($name);
+
+        return $refl->isFinal();
+    }
+}