<?php
 
 namespace Illuminate\Support;
 
 /**
  * ProcessUtils is a bunch of utility methods.
  *
  * This class was originally copied from Symfony 3.
  */
 class ProcessUtils
 {
     /**
      * Escapes a string to be used as a shell argument.
      *
      * @param  string  $argument
      * @return string
      */
     public static function escapeArgument($argument)
     {
         // Fix for PHP bug #43784 escapeshellarg removes % from given string
         // Fix for PHP bug #49446 escapeshellarg doesn't work on Windows
         // @see https://bugs.php.net/bug.php?id=43784
         // @see https://bugs.php.net/bug.php?id=49446
         if ('\\' === DIRECTORY_SEPARATOR) {
             if ('' === $argument) {
                 return '""';
             }
 
             $escapedArgument = '';
             $quote = false;
 
             foreach (preg_split('/(")/', $argument, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE) as $part) {
                 if ('"' === $part) {
                     $escapedArgument .= '\\"';
                 } elseif (self::isSurroundedBy($part, '%')) {
                     // Avoid environment variable expansion
                     $escapedArgument .= '^%"'.substr($part, 1, -1).'"^%';
                 } else {
                     // escape trailing backslash
                     if ('\\' === substr($part, -1)) {
                         $part .= '\\';
                     }
                     $quote = true;
                     $escapedArgument .= $part;
                 }
             }
 
             if ($quote) {
                 $escapedArgument = '"'.$escapedArgument.'"';
             }
 
             return $escapedArgument;
         }
 
         return "'".str_replace("'", "'\\''", $argument)."'";
     }
 
     /**
      * Is the given string surrounded by the given character?
      *
      * @param  string  $arg
      * @param  string  $char
      * @return bool
      */
     protected static function isSurroundedBy($arg, $char)
     {
         return 2 < strlen($arg) && $char === $arg[0] && $char === $arg[strlen($arg) - 1];
     }
 }