Viewing file:  Gitignore.php (3.99 KB) -rw-r--r--
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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 Ahmed Abdou <mail@ahmd.io>
*/
class Gitignore
{
/**
* Returns a regexp which is the equivalent of the gitignore pattern.
*
* @return string The regexp
*/
public static function toRegex(string $gitignoreFileContent): string
{
$gitignoreFileContent = preg_replace('/^[^\\\r\n]*#.*/m', '', $gitignoreFileContent);
$gitignoreLines = preg_split('/\r\n|\r|\n/', $gitignoreFileContent);
$positives = [];
$negatives = [];
foreach ($gitignoreLines as $i => $line) {
$line = trim($line);
if ('' === $line) {
continue;
}
if (1 === preg_match('/^!/', $line)) {
$positives[$i] = null;
$negatives[$i] = self::getRegexFromGitignore(preg_replace('/^!(.*)/', '${1}', $line), true);
continue;
}
$negatives[$i] = null;
$positives[$i] = self::getRegexFromGitignore($line);
}
$index = 0;
$patterns = [];
foreach ($positives as $pattern) {
if (null === $pattern) {
continue;
}
$negativesAfter = array_filter(\array_slice($negatives, ++$index));
if ([] !== $negativesAfter) {
$pattern .= sprintf('(?<!%s)', implode('|', $negativesAfter));
}
$patterns[] = $pattern;
}
return sprintf('/^((%s))$/', implode(')|(', $patterns));
}
private static function getRegexFromGitignore(string $gitignorePattern, bool $negative = false): string
{
$regex = '';
$isRelativePath = false;
// If there is a separator at the beginning or middle (or both) of the pattern, then the pattern is relative to the directory level of the particular .gitignore file itself
$slashPosition = strpos($gitignorePattern, '/');
if (false !== $slashPosition && \strlen($gitignorePattern) - 1 !== $slashPosition) {
if (0 === $slashPosition) {
$gitignorePattern = substr($gitignorePattern, 1);
}
$isRelativePath = true;
$regex .= '^';
}
if ('/' === $gitignorePattern[\strlen($gitignorePattern) - 1]) {
$gitignorePattern = substr($gitignorePattern, 0, -1);
}
$iMax = \strlen($gitignorePattern);
for ($i = 0; $i < $iMax; ++$i) {
$tripleChars = substr($gitignorePattern, $i, 3);
if ('**/' === $tripleChars || '/**' === $tripleChars) {
$regex .= '.*';
$i += 2;
continue;
}
$doubleChars = substr($gitignorePattern, $i, 2);
if ('**' === $doubleChars) {
$regex .= '.*';
++$i;
continue;
}
if ('*/' === $doubleChars) {
$regex .= '[^\/]*\/?[^\/]*';
++$i;
continue;
}
$c = $gitignorePattern[$i];
switch ($c) {
case '*':
$regex .= $isRelativePath ? '[^\/]*' : '[^\/]*\/?[^\/]*';
break;
case '/':
case '.':
case ':':
case '(':
case ')':
case '{':
case '}':
$regex .= '\\'.$c;
break;
default:
$regex .= $c;
}
}
if ($negative) {
// a lookbehind assertion has to be a fixed width (it can not have nested '|' statements)
return sprintf('%s$|%s\/$', $regex, $regex);
}
return '(?>'.$regex.'($|\/.*))';
}
}
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