Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of Psy Shell.
Chris@0:  *
Chris@0:  * (c) 2012-2017 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\Assign;
Chris@0: use PhpParser\Node\Expr\Variable;
Chris@0: use Psy\Exception\FatalErrorException;
Chris@0: 
Chris@0: /**
Chris@0:  * Validate that the user input does not assign the `$this` variable.
Chris@0:  *
Chris@0:  * @author Martin Hasoň <martin.hason@gmail.com>
Chris@0:  */
Chris@0: class AssignThisVariablePass extends CodeCleanerPass
Chris@0: {
Chris@0:     /**
Chris@0:      * Validate that the user input does not assign the `$this` variable.
Chris@0:      *
Chris@0:      * @throws RuntimeException if the user assign the `$this` variable
Chris@0:      *
Chris@0:      * @param Node $node
Chris@0:      */
Chris@0:     public function enterNode(Node $node)
Chris@0:     {
Chris@0:         if ($node instanceof Assign && $node->var instanceof Variable && $node->var->name === 'this') {
Chris@0:             throw new FatalErrorException('Cannot re-assign $this', 0, E_ERROR, null, $node->getLine());
Chris@0:         }
Chris@0:     }
Chris@0: }