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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\Casing;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

final class IntegerLiteralCaseFixer extends AbstractFixer
{
    /**
     * {@inheritdoc}
     */
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Integer literals must be in correct case.',
            [
                new CodeSample(
                    "<?php\n\$foo = 0Xff;\n\$bar = 0B11111111;\n"
                ),
            ]
        );
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $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();

            if (1 !== Preg::match('#^0[bxoBXO][0-9a-fA-F]+$#', $content)) {
                continue;
            }

            $newContent = '0'.strtolower($content[1]).strtoupper(substr($content, 2));

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

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