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