<?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()
{
}

/**
* 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;
}
}