UglifyCssFilter.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\Asset\AssetInterface;
use Assetic\Exception\FilterException;

/**
 * UglifyCss filter.
 *
 * @link https://github.com/fmarcia/UglifyCSS
 * @author Franck Marcia <franck.marcia@gmail.com>
 */
class UglifyCssFilter extends BaseNodeFilter {
  private $uglifycssBin;
  private $nodeBin;
  private $expandVars;
  private $uglyComments;
  private $cuteComments;

  /**
   * @param string $uglifycssBin Absolute path to the uglifycss executable
   * @param string $nodeBin       Absolute path to the folder containg node.js executable
   */
  public function __construct($uglifycssBin = '/usr/bin/uglifycss', $nodeBin = null) {
    $this->uglifycssBin = $uglifycssBin;
    $this->nodeBin = $nodeBin;
  }

  /**
   * Expand variables
   * @param bool $expandVars True to enable
   */
  public function setExpandVars($expandVars) {
    $this->expandVars = $expandVars;
  }

  /**
   * Remove newlines within preserved comments
   * @param bool $uglyComments True to enable
   */
  public function setUglyComments($uglyComments) {
    $this->uglyComments = $uglyComments;
  }

  /**
   * Preserve newlines within and around preserved comments
   * @param bool $cuteComments True to enable
   */
  public function setCuteComments($cuteComments) {
    $this->cuteComments = $cuteComments;
  }

  /**
   * @see Assetic\Filter\FilterInterface::filterLoad()
   */
  public function filterLoad(AssetInterface $asset) {
  }

  /**
   * Run the asset through UglifyJs
   *
   * @see Assetic\Filter\FilterInterface::filterDump()
   */
  public function filterDump(AssetInterface $asset) {
    $pb = $this
      ->createProcessBuilder($this->nodeBin ? array(
      $this->nodeBin,
      $this->uglifycssBin,
    ) : array(
      $this->uglifycssBin,
    ));
    if ($this->expandVars) {
      $pb
        ->add('--expand-vars');
    }
    if ($this->uglyComments) {
      $pb
        ->add('--ugly-comments');
    }
    if ($this->cuteComments) {
      $pb
        ->add('--cute-comments');
    }

    // input and output files
    $input = tempnam(sys_get_temp_dir(), 'input');
    file_put_contents($input, $asset
      ->getContent());
    $pb
      ->add($input);
    $proc = $pb
      ->getProcess();
    $code = $proc
      ->run();
    unlink($input);
    if (127 === $code) {
      throw new \RuntimeException('Path to node executable could not be resolved.');
    }
    if (0 !== $code) {
      throw FilterException::fromProcess($proc)
        ->setInput($asset
        ->getContent());
    }
    $asset
      ->setContent($proc
      ->getOutput());
  }

}