<?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\Process;

use Symfony\Component\Process\Exception\InvalidArgumentException;

/**
* ProcessUtils is a bunch of utility methods.
*
* This class contains static methods only and is not meant to be instantiated.
*
* @author Martin Hasoň <martin.hason@gmail.com>
*/
class ProcessUtils
{
/**
* This class should not be instantiated.
*/
private function __construct()
{
}

/**
* Escapes a string to be used as a shell argument.
*
* @param string $argument The argument that will be escaped
*
* @return string The escaped argument
*
* @deprecated since version 3.3, to be removed in 4.0. Use a command line array or give env vars to the `Process::start/run()` method instead.
*/
public static function escapeArgument($argument)
{
@trigger_error('The '.__METHOD__.'() method is deprecated since version 3.3 and will be removed in 4.0. Use a command line array or give env vars to the Process::start/run() method instead.', E_USER_DEPRECATED);

//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 ('' === $argument) {
return escapeshellarg($argument);
}

$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)."'";
}

/**
* Validates and normalizes a Process input.
*
* @param string $caller The name of method call that validates the input
* @param mixed $input The input to validate
*
* @return mixed The validated input
*
* @throws InvalidArgumentException In case the input is not valid
*/
public static function validateInput($caller, $input)
{
if (null !== $input) {
if (is_resource($input)) {
return $input;
}
if (is_string($input)) {
return $input;
}
if (is_scalar($input)) {
return (string) $input;
}
if ($input instanceof Process) {
return $input->getIterator($input::ITER_SKIP_ERR);
}
if ($input instanceof \Iterator) {
return $input;
}
if ($input instanceof \Traversable) {
return new \IteratorIterator($input);
}

throw new InvalidArgumentException(sprintf('%s only accepts strings, Traversable objects or stream resources.', $caller));
}

return $input;
}

private static function isSurroundedBy($arg, $char)
{
return 2 < strlen($arg) && $char === $arg[0] && $char === $arg[strlen($arg) - 1];
}
}