class AssetWriter

class AssetWriter {
  private $dir;
  private $values;

  /**
   * Constructor.
   *
   * @param string $dir    The base web directory
   * @param array  $values Variable values
   *
   * @throws \InvalidArgumentException if a variable value is not a string
   */
  public function __construct($dir, array $values = array()) {
    foreach ($values as $var => $vals) {
      foreach ($vals as $value) {
        if (!is_string($value)) {
          throw new \InvalidArgumentException(sprintf('All variable values must be strings, but got %s for variable "%s".', json_encode($value), $var));
        }
      }
    }
    $this->dir = $dir;
    $this->values = $values;
  }
  public function writeManagerAssets(AssetManager $am) {
    foreach ($am
      ->getNames() as $name) {
      $this
        ->writeAsset($am
        ->get($name));
    }
  }
  public function writeAsset(AssetInterface $asset) {
    foreach (VarUtils::getCombinations($asset
      ->getVars(), $this->values) as $combination) {
      $asset
        ->setValues($combination);
      static::write($this->dir . '/' . VarUtils::resolve($asset
        ->getTargetPath(), $asset
        ->getVars(), $asset
        ->getValues()), $asset
        ->dump());
    }
  }
  protected static function write($path, $contents) {
    if (!is_dir($dir = dirname($path)) && false === @mkdir($dir, 0777, true)) {
      throw new \RuntimeException('Unable to create directory ' . $dir);
    }
    if (false === @file_put_contents($path, $contents)) {
      throw new \RuntimeException('Unable to write file ' . $path);
    }
  }

  /**
   * Not used.
   *
   * This method is provided for backward compatibility with certain versions
   * of AsseticBundle.
   */
  private function getCombinations(array $vars) {
    return VarUtils::getCombinations($vars, $this->values);
  }

}