BaseProcessFilter.php

<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2013 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Assetic\Filter;

use Assetic\Filter\FilterInterface;
use Symfony\Component\Process\ProcessBuilder;

/**
 * An external process based filter which provides a way to set a timeout on the process.
 */
abstract class BaseProcessFilter implements FilterInterface {
  private $timeout;

  /**
   * Set the process timeout.
   *
   * @param int $timeout The timeout for the process
   */
  public function setTimeout($timeout) {
    $this->timeout = $timeout;
  }

  /**
   * Creates a new process builder.
   *
   * @param array $arguments An optional array of arguments
   *
   * @return ProcessBuilder A new process builder
   */
  protected function createProcessBuilder(array $arguments = array()) {
    $pb = new ProcessBuilder($arguments);
    if (null !== $this->timeout) {
      $pb
        ->setTimeout($this->timeout);
    }
    return $pb;
  }
  protected function mergeEnv(ProcessBuilder $pb) {
    foreach (array_filter($_SERVER, 'is_scalar') as $key => $value) {
      $pb
        ->setEnv($key, $value);
    }
  }

}