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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2017 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
*/
public function enterNode(Node $node)
{
if ($node instanceof Variable && $node->name === '__psysh__') {
throw new RuntimeException('Don\'t mess with $__psysh__. Bad things will happen.');
}
}
}