<?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;

use PhpCsFixer\Tokenizer\Analyzer\ArgumentsAnalyzer;
use PhpCsFixer\Tokenizer\Tokens;
/**
 * @internal
 */
abstract class AbstractFopenFlagFixer extends \PhpCsFixer\AbstractFunctionReferenceFixer
{
    public function isCandidate(Tokens $tokens) : bool
    {
        return $tokens->isAllTokenKindsFound([\T_STRING, \T_CONSTANT_ENCAPSED_STRING]);
    }
    protected function applyFix(\SplFileInfo $file, Tokens $tokens) : void
    {
        $argumentsAnalyzer = new ArgumentsAnalyzer();
        $index = 0;
        $end = $tokens->count() - 1;
        while (\true) {
            $candidate = $this->find('fopen', $tokens, $index, $end);
            if (null === $candidate) {
                break;
            }
            $index = $candidate[1];
            // proceed to '(' of `fopen`
            // fetch arguments
            $arguments = $argumentsAnalyzer->getArguments($tokens, $index, $candidate[2]);
            $argumentsCount = \count($arguments);
            // argument count sanity check
            if ($argumentsCount < 2 || $argumentsCount > 4) {
                continue;
            }
            $argumentStartIndex = \array_keys($arguments)[1];
            // get second argument index
            $this->fixFopenFlagToken($tokens, $argumentStartIndex, $arguments[$argumentStartIndex]);
        }
    }
    protected abstract function fixFopenFlagToken(Tokens $tokens, int $argumentStartIndex, int $argumentEndIndex) : void;
    protected function isValidModeString(string $mode) : bool
    {
        $modeLength = \strlen($mode);
        if ($modeLength < 1 || $modeLength > 13) {
            // 13 === length 'r+w+a+x+c+etb'
            return \false;
        }
        $validFlags = ['a' => \true, 'b' => \true, 'c' => \true, 'e' => \true, 'r' => \true, 't' => \true, 'w' => \true, 'x' => \true];
        if (!isset($validFlags[$mode[0]])) {
            return \false;
        }
        unset($validFlags[$mode[0]]);
        for ($i = 1; $i < $modeLength; ++$i) {
            if (isset($validFlags[$mode[$i]])) {
                unset($validFlags[$mode[$i]]);
                continue;
            }
            if ('+' !== $mode[$i] || 'a' !== $mode[$i - 1] && 'c' !== $mode[$i - 1] && 'r' !== $mode[$i - 1] && 'w' !== $mode[$i - 1] && 'x' !== $mode[$i - 1]) {
                return \false;
            }
        }
        return \true;
    }
}
