AssignThisVariablePass.php
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AssignThisVariablePass.php
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	<?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());
	}
	}
	}