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✏️ Editing: OctalNotationFixer.php

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<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *     Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer\Fixer\Basic;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\FixerDefinition\VersionSpecification;
use PhpCsFixer\FixerDefinition\VersionSpecificCodeSample;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

final class OctalNotationFixer extends AbstractFixer
{
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Literal octal must be in `0o` notation.',
            [
                new VersionSpecificCodeSample(
                    "<?php \$foo = 0123;\n",
                    new VersionSpecification(8_01_00)
                ),
            ]
        );
    }

public function isCandidate(Tokens $tokens): bool
    {
        return \PHP_VERSION_ID >= 8_01_00 && $tokens->isTokenKindFound(T_LNUMBER);
    }

protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        foreach ($tokens as $index => $token) {
            if (!$token->isGivenKind(T_LNUMBER)) {
                continue;
            }

$content = $token->getContent();

$newContent = Preg::replace('#^0_*+([0-7_]+)$#', '0o$1', $content);

if ($content === $newContent) {
                continue;
            }

$tokens[$index] = new Token([T_LNUMBER, $newContent]);
        }
    }
}

✏️ Editing: OctalNotationFixer.php

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