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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Finder;
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/**
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* Gitignore matches against text.
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*
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* @author Michael Voříšek <vorismi3@fel.cvut.cz>
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* @author Ahmed Abdou <mail@ahmd.io>
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*/
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class Gitignore
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{
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/**
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* Returns a regexp which is the equivalent of the gitignore pattern.
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*
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* Format specification: https://git-scm.com/docs/gitignore#_pattern_format
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*/
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public static function toRegex(string $gitignoreFileContent): string
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{
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return self::buildRegex($gitignoreFileContent, false);
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}
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public static function toRegexMatchingNegatedPatterns(string $gitignoreFileContent): string
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{
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return self::buildRegex($gitignoreFileContent, true);
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}
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private static function buildRegex(string $gitignoreFileContent, bool $inverted): string
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{
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$gitignoreFileContent = preg_replace('~(?<!\\\\)#[^\n\r]*~', '', $gitignoreFileContent);
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$gitignoreLines = preg_split('~\r\n?|\n~', $gitignoreFileContent);
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$res = self::lineToRegex('');
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foreach ($gitignoreLines as $line) {
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$line = preg_replace('~(?<!\\\\)[ \t]+$~', '', $line);
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if (str_starts_with($line, '!')) {
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$line = substr($line, 1);
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$isNegative = true;
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} else {
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$isNegative = false;
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}
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if ('' !== $line) {
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if ($isNegative xor $inverted) {
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$res = '(?!'.self::lineToRegex($line).'$)'.$res;
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} else {
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$res = '(?:'.$res.'|'.self::lineToRegex($line).')';
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}
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}
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}
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return '~^(?:'.$res.')~s';
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}
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private static function lineToRegex(string $gitignoreLine): string
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{
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if ('' === $gitignoreLine) {
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return '$f'; // always false
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}
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$slashPos = strpos($gitignoreLine, '/');
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if (false !== $slashPos && \strlen($gitignoreLine) - 1 !== $slashPos) {
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if (0 === $slashPos) {
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$gitignoreLine = substr($gitignoreLine, 1);
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}
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$isAbsolute = true;
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} else {
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$isAbsolute = false;
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}
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$regex = preg_quote(str_replace('\\', '', $gitignoreLine), '~');
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$regex = preg_replace_callback('~\\\\\[((?:\\\\!)?)([^\[\]]*)\\\\\]~', function (array $matches): string {
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return '['.('' !== $matches[1] ? '^' : '').str_replace('\\-', '-', $matches[2]).']';
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}, $regex);
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$regex = preg_replace('~(?:(?:\\\\\*){2,}(/?))+~', '(?:(?:(?!//).(?<!//))+$1)?', $regex);
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$regex = preg_replace('~\\\\\*~', '[^/]*', $regex);
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$regex = preg_replace('~\\\\\?~', '[^/]', $regex);
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return ($isAbsolute ? '' : '(?:[^/]+/)*')
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.$regex
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.(!str_ends_with($gitignoreLine, '/') ? '(?:$|/)' : '');
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}
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}
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