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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()); } } } }
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