52 lines
1.4 KiB
PHP
Executable File
52 lines
1.4 KiB
PHP
Executable File
<?php
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/*
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* This file is part of Psy Shell.
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*
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* (c) 2012-2026 Justin Hileman
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Psy\CodeCleaner;
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use PhpParser\Node;
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use PhpParser\Node\Expr\ArrayDimFetch;
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use PhpParser\Node\Expr\Isset_;
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use PhpParser\Node\Expr\NullsafePropertyFetch;
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use PhpParser\Node\Expr\PropertyFetch;
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use PhpParser\Node\Expr\Variable;
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use Psy\Exception\FatalErrorException;
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/**
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* Code cleaner pass to ensure we only allow variables, array fetch and property
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* fetch expressions in isset() calls.
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*/
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class IssetPass extends CodeCleanerPass
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{
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const EXCEPTION_MSG = 'Cannot use isset() on the result of an expression (you can use "null !== expression" instead)';
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/**
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* @throws FatalErrorException
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*
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* @param Node $node
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*
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* @return int|Node|null Replacement node (or special return value)
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*/
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public function enterNode(Node $node)
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{
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if (!$node instanceof Isset_) {
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return null;
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}
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foreach ($node->vars as $var) {
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if (!$var instanceof Variable && !$var instanceof ArrayDimFetch && !$var instanceof PropertyFetch && !$var instanceof NullsafePropertyFetch) {
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throw new FatalErrorException(self::EXCEPTION_MSG, 0, \E_ERROR, null, $node->getStartLine());
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}
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}
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return null;
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}
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}
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