protected function setDefaults()
  {
    $this->importPaths = array();
    $this->pluginPaths = array();
    $this->sourceMap = self::DEFAULT_SOURCEMAP;
    $this->mapComment = self::DEFAULT_MAPCOMMENT;
    $this->lineNumbers = self::DEFAULT_LINENUMBERS;
    $this->precision = self::DEFAULT_PRECISION;
    $this->style = self::DEFAULT_STYLE;
  }