<?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
 * @TODO 4.0 remove this analyzer and move this logic into a transformer
 */
final class AlternativeSyntaxAnalyzer
{
    public function belongsToAlternativeSyntax(Tokens $tokens, int $index) : bool
    {
        if (!$tokens[$index]->equals(':')) {
            return \false;
        }
        $prevIndex = $tokens->getPrevMeaningfulToken($index);
        if ($tokens[$prevIndex]->isGivenKind(\T_ELSE)) {
            return \true;
        }
        if (!$tokens[$prevIndex]->equals(')')) {
            return \false;
        }
        $openParenthesisIndex = $tokens->findBlockStart(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $prevIndex);
        $beforeOpenParenthesisIndex = $tokens->getPrevMeaningfulToken($openParenthesisIndex);
        return $tokens[$beforeOpenParenthesisIndex]->isGivenKind([\T_DECLARE, \T_ELSEIF, \T_FOR, \T_FOREACH, \T_IF, \T_SWITCH, \T_WHILE]);
    }
}
