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File Content: EmptyArrayDimFetchPass.php

<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2025 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\Assign;
use PhpParser\Node\Expr\AssignRef;
use PhpParser\Node\Stmt\Foreach_;
use Psy\Exception\FatalErrorException;

/**
 * Validate empty brackets are only used for assignment.
 */
class EmptyArrayDimFetchPass extends CodeCleanerPass
{
    const EXCEPTION_MESSAGE = 'Cannot use [] for reading';

private array $theseOnesAreFine = [];

/**
     * @return Node[]|null Array of nodes
     */
    public function beforeTraverse(array $nodes)
    {
        $this->theseOnesAreFine = [];

return null;
    }

/**
     * @throws FatalErrorException if the user used empty array dim fetch outside of assignment
     *
     * @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 ArrayDimFetch) {
            $this->theseOnesAreFine[] = $node->var;
        } elseif ($node instanceof AssignRef && $node->expr instanceof ArrayDimFetch) {
            $this->theseOnesAreFine[] = $node->expr;
        } elseif ($node instanceof Foreach_ && $node->valueVar instanceof ArrayDimFetch) {
            $this->theseOnesAreFine[] = $node->valueVar;
        } elseif ($node instanceof ArrayDimFetch && $node->var instanceof ArrayDimFetch) {
            // $a[]['b'] = 'c'
            if (\in_array($node, $this->theseOnesAreFine)) {
                $this->theseOnesAreFine[] = $node->var;
            }
        }

if ($node instanceof ArrayDimFetch && $node->dim === null) {
            if (!\in_array($node, $this->theseOnesAreFine)) {
                throw new FatalErrorException(self::EXCEPTION_MESSAGE, $node->getStartLine());
            }
        }

return null;
    }
}

Name	Size	Permission
AbstractClassPass.php	2434 bytes	0644
AssignThisVariablePass.php	1141 bytes	0644
CallTimePassByReferencePass.php	1639 bytes	0644
CalledClassPass.php	2916 bytes	0644
CodeCleanerPass.php	415 bytes	0644
EmptyArrayDimFetchPass.php	2080 bytes	0644
ExitPass.php	976 bytes	0644
FinalClassPass.php	1841 bytes	0644
FunctionContextPass.php	1632 bytes	0644
FunctionReturnInWriteContextPass.php	2772 bytes	0644
ImplicitReturnPass.php	4219 bytes	0644
ImplicitUsePass.php	13428 bytes	0644
IssetPass.php	1433 bytes	0644
LabelContextPass.php	2711 bytes	0644
LeavePsyshAlonePass.php	1014 bytes	0644
ListPass.php	2959 bytes	0644
LoopContextPass.php	4106 bytes	0644
MagicConstantsPass.php	1090 bytes	0644
NamespaceAwarePass.php	5266 bytes	0644
NamespacePass.php	3322 bytes	0644
NoReturnValue.php	828 bytes	0644
PassableByReferencePass.php	4917 bytes	0644
RequirePass.php	4905 bytes	0644
ReturnTypePass.php	3815 bytes	0644
StrictTypesPass.php	3185 bytes	0644
UseStatementPass.php	5155 bytes	0644
ValidClassNamePass.php	9495 bytes	0644
ValidConstructorPass.php	4408 bytes	0644
ValidFunctionNamePass.php	2472 bytes	0644

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