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vendor/psy/psysh/src/CodeCleaner/FunctionContextPass.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\Expr\Yield_;
+use PhpParser\Node\FunctionLike;
+use Psy\Exception\FatalErrorException;
+
+class FunctionContextPass extends CodeCleanerPass
+{
+    /** @var int */
+    private $functionDepth;
+
+    /**
+     * @param array $nodes
+     *
+     * @return Node[]|null Array of nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->functionDepth = 0;
+    }
+
+    /**
+     * @return int|Node|null Replacement node (or special return value)
+     */
+    public function enterNode(Node $node)
+    {
+        if ($node instanceof FunctionLike) {
+            $this->functionDepth++;
+
+            return;
+        }
+
+        // node is inside function context
+        if ($this->functionDepth !== 0) {
+            return;
+        }
+
+        // It causes fatal error.
+        if ($node instanceof Yield_) {
+            $msg = 'The "yield" expression can only be used inside a function';
+            throw new FatalErrorException($msg, 0, \E_ERROR, null, $node->getLine());
+        }
+    }
+
+    /**
+     * @param \PhpParser\Node $node
+     *
+     * @return int|Node|Node[]|null Replacement node (or special return value)
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof FunctionLike) {
+            $this->functionDepth--;
+        }
+    }
+}