IssetPass.php
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IssetPass.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\ArrayDimFetch;
	use PhpParser\Node\Expr\Isset_;
	use PhpParser\Node\Expr\NullsafePropertyFetch;
	use PhpParser\Node\Expr\PropertyFetch;
	use PhpParser\Node\Expr\Variable;
	use Psy\Exception\FatalErrorException;

	/**
	* Code cleaner pass to ensure we only allow variables, array fetch and property
	* fetch expressions in isset() calls.
	*/
	class IssetPass extends CodeCleanerPass
	{
	const EXCEPTION_MSG = 'Cannot use isset() on the result of an expression (you can use "null !== expression" instead)';

	/**
	* @throws FatalErrorException
	*
	* @param Node $node
	*
	* @return int\|Node\|null Replacement node (or special return value)
	*/
	public function enterNode(Node $node)
	{
	if (!$node instanceof Isset_) {
	return;
	}

	foreach ($node->vars as $var) {
	if (!$var instanceof Variable && !$var instanceof ArrayDimFetch && !$var instanceof PropertyFetch && !$var instanceof NullsafePropertyFetch) {
	throw new FatalErrorException(self::EXCEPTION_MSG, 0, \E_ERROR, null, $node->getStartLine());
	}
	}
	}
	}