<?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;
 
 /**
  * Glob matches globbing patterns against text.
  *
  *     if match_glob("foo.*", "foo.bar") echo "matched\n";
  *
  *     // prints foo.bar and foo.baz
  *     $regex = glob_to_regex("foo.*");
  *     for (['foo.bar', 'foo.baz', 'foo', 'bar'] as $t)
  *     {
  *         if (/$regex/) echo "matched: $car\n";
  *     }
  *
  * Glob implements glob(3) style matching that can be used to match
  * against text, rather than fetching names from a filesystem.
  *
  * Based on the Perl Text::Glob module.
  *
  * @author Fabien Potencier <fabien@symfony.com> PHP port
  * @author     Richard Clamp <richardc@unixbeard.net> Perl version
  * @copyright  2004-2005 Fabien Potencier <fabien@symfony.com>
  * @copyright  2002 Richard Clamp <richardc@unixbeard.net>
  */
 class Glob
 {
     /**
      * Returns a regexp which is the equivalent of the glob pattern.
      *
      * @param string $glob                The glob pattern
      * @param bool   $strictLeadingDot
      * @param bool   $strictWildcardSlash
      * @param string $delimiter           Optional delimiter
      *
      * @return string regex The regexp
      */
     public static function toRegex($glob, $strictLeadingDot = true, $strictWildcardSlash = true, $delimiter = '#')
     {
         $firstByte = true;
         $escaping = false;
         $inCurlies = 0;
         $regex = '';
         $sizeGlob = \strlen($glob);
         for ($i = 0; $i < $sizeGlob; ++$i) {
             $car = $glob[$i];
             if ($firstByte && $strictLeadingDot && '.' !== $car) {
                 $regex .= '(?=[^\.])';
             }
 
             $firstByte = '/' === $car;
 
             if ($firstByte && $strictWildcardSlash && isset($glob[$i + 2]) && '**' === $glob[$i + 1].$glob[$i + 2] && (!isset($glob[$i + 3]) || '/' === $glob[$i + 3])) {
                 $car = '[^/]++/';
                 if (!isset($glob[$i + 3])) {
                     $car .= '?';
                 }
 
                 if ($strictLeadingDot) {
                     $car = '(?=[^\.])'.$car;
                 }
 
                 $car = '/(?:'.$car.')*';
                 $i += 2 + isset($glob[$i + 3]);
 
                 if ('/' === $delimiter) {
                     $car = str_replace('/', '\\/', $car);
                 }
             }
 
             if ($delimiter === $car || '.' === $car || '(' === $car || ')' === $car || '|' === $car || '+' === $car || '^' === $car || '$' === $car) {
                 $regex .= "\\$car";
             } elseif ('*' === $car) {
                 $regex .= $escaping ? '\\*' : ($strictWildcardSlash ? '[^/]*' : '.*');
             } elseif ('?' === $car) {
                 $regex .= $escaping ? '\\?' : ($strictWildcardSlash ? '[^/]' : '.');
             } elseif ('{' === $car) {
                 $regex .= $escaping ? '\\{' : '(';
                 if (!$escaping) {
                     ++$inCurlies;
                 }
             } elseif ('}' === $car && $inCurlies) {
                 $regex .= $escaping ? '}' : ')';
                 if (!$escaping) {
                     --$inCurlies;
                 }
             } elseif (',' === $car && $inCurlies) {
                 $regex .= $escaping ? ',' : '|';
             } elseif ('\\' === $car) {
                 if ($escaping) {
                     $regex .= '\\\\';
                     $escaping = false;
                 } else {
                     $escaping = true;
                 }
 
                 continue;
             } else {
                 $regex .= $car;
             }
             $escaping = false;
         }
 
         return $delimiter.'^'.$regex.'$'.$delimiter;
     }
 }