Chris@13: <?php
Chris@13: 
Chris@13: /*
Chris@13:  * This file is part of Psy Shell.
Chris@13:  *
Chris@13:  * (c) 2012-2018 Justin Hileman
Chris@13:  *
Chris@13:  * For the full copyright and license information, please view the LICENSE
Chris@13:  * file that was distributed with this source code.
Chris@13:  */
Chris@13: 
Chris@13: namespace Psy\CodeCleaner;
Chris@13: 
Chris@13: use PhpParser\Node;
Chris@13: use PhpParser\Node\Expr\Assign;
Chris@13: use PhpParser\Node\Expr\Variable;
Chris@13: use Psy\Exception\FatalErrorException;
Chris@13: 
Chris@13: /**
Chris@13:  * Validate that the user input does not assign the `$this` variable.
Chris@13:  *
Chris@13:  * @author Martin Hasoň <martin.hason@gmail.com>
Chris@13:  */
Chris@13: class AssignThisVariablePass extends CodeCleanerPass
Chris@13: {
Chris@13:     /**
Chris@13:      * Validate that the user input does not assign the `$this` variable.
Chris@13:      *
Chris@13:      * @throws RuntimeException if the user assign the `$this` variable
Chris@13:      *
Chris@13:      * @param Node $node
Chris@13:      */
Chris@13:     public function enterNode(Node $node)
Chris@13:     {
Chris@13:         if ($node instanceof Assign && $node->var instanceof Variable && $node->var->name === 'this') {
Chris@13:             throw new FatalErrorException('Cannot re-assign $this', 0, E_ERROR, null, $node->getLine());
Chris@13:         }
Chris@13:     }
Chris@13: }