50 lines
1.4 KiB
PHP
50 lines
1.4 KiB
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\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->getLine());
|
|
}
|
|
}
|
|
}
|
|
}
|