name : AssignThisVariablePass.php <?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\Assign; use PhpParser\Node\Expr\Variable; use Psy\Exception\FatalErrorException; /** * Validate that the user input does not assign the `$this` variable. * * @author Martin Hasoň <martin.hason@gmail.com> */ class AssignThisVariablePass extends CodeCleanerPass { /** * Validate that the user input does not assign the `$this` variable. * * @throws FatalErrorException if the user assign the `$this` variable * * @param Node $node * * @return int|Node|null Replacement node (or special return value) */ public function enterNode(Node $node) { if ($node instanceof Assign && $node->var instanceof Variable && $node->var->name === 'this') { throw new FatalErrorException('Cannot re-assign $this', 0, \E_ERROR, null, $node->getStartLine()); } } }