LeavePsyshAlonePass.php
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LeavePsyshAlonePass.php
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	<?php

	/*
	* This file is part of Psy Shell.
	*
	* (c) 2012-2023 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\Variable;
	use Psy\Exception\RuntimeException;

	/**
	* Validate that the user input does not reference the `$__psysh__` variable.
	*/
	class LeavePsyshAlonePass extends CodeCleanerPass
	{
	/**
	* Validate that the user input does not reference the `$__psysh__` variable.
	*
	* @throws RuntimeException if the user is messing with $__psysh__
	*
	* @param Node $node
	*
	* @return int\|Node\|null Replacement node (or special return value)
	*/
	public function enterNode(Node $node)
	{
	if ($node instanceof Variable && $node->name === '__psysh__') {
	throw new RuntimeException('Don\'t mess with $__psysh__; bad things will happen');
	}
	}
	}