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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\Tokenizer\Analyzer;

use PhpCsFixer\Tokenizer\Tokens;

/**
 * @internal
 */
final class WhitespacesAnalyzer
{
    public static function detectIndent(Tokens $tokens, int $index): string
    {
        while (true) {
            $whitespaceIndex = $tokens->getPrevTokenOfKind($index, [[T_WHITESPACE]]);

            if (null === $whitespaceIndex) {
                return '';
            }

            $whitespaceToken = $tokens[$whitespaceIndex];

            if (str_contains($whitespaceToken->getContent(), "\n")) {
                break;
            }

            $prevToken = $tokens[$whitespaceIndex - 1];

            if ($prevToken->isGivenKind([T_OPEN_TAG, T_COMMENT]) && "\n" === substr($prevToken->getContent(), -1)) {
                break;
            }

            $index = $whitespaceIndex;
        }

        $explodedContent = explode("\n", $whitespaceToken->getContent());

        return end($explodedContent);
    }
}