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Revision Autor Zeilennr. Zeile
148 lars 1 
<?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) 2012-2022 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\Assign;
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use Psy\Exception\FatalErrorException;
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/**
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 * Validate empty brackets are only used for assignment.
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 */
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class EmptyArrayDimFetchPass extends CodeCleanerPass
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{
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    const EXCEPTION_MESSAGE = 'Cannot use [] for reading';
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    private $theseOnesAreFine = [];
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    /**
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     * @return Node[]|null Array of nodes
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     */
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    public function beforeTraverse(array $nodes)
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    {
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        $this->theseOnesAreFine = [];
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    }
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    /**
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     * @throws FatalErrorException if the user used empty empty array dim fetch outside of assignment
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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 Assign && $node->var instanceof ArrayDimFetch) {
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            $this->theseOnesAreFine[] = $node->var;
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        }
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        if ($node instanceof ArrayDimFetch && $node->dim === null) {
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            if (!\in_array($node, $this->theseOnesAreFine)) {
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                throw new FatalErrorException(self::EXCEPTION_MESSAGE, $node->getLine());
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            }
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        }
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    }
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}