Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of Psy Shell.
Chris@0:  *
Chris@0:  * (c) 2012-2018 Justin Hileman
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Psy\CodeCleaner;
Chris@0: 
Chris@0: use PhpParser\Node;
Chris@0: use PhpParser\Node\Expr\Variable;
Chris@0: use Psy\Exception\RuntimeException;
Chris@0: 
Chris@0: /**
Chris@0:  * Validate that the user input does not reference the `$__psysh__` variable.
Chris@0:  */
Chris@0: class LeavePsyshAlonePass extends CodeCleanerPass
Chris@0: {
Chris@0:     /**
Chris@0:      * Validate that the user input does not reference the `$__psysh__` variable.
Chris@0:      *
Chris@0:      * @throws RuntimeException if the user is messing with $__psysh__
Chris@0:      *
Chris@0:      * @param Node $node
Chris@0:      */
Chris@0:     public function enterNode(Node $node)
Chris@0:     {
Chris@0:         if ($node instanceof Variable && $node->name === '__psysh__') {
Chris@0:             throw new RuntimeException('Don\'t mess with $__psysh__; bad things will happen');
Chris@0:         }
Chris@0:     }
Chris@0: }