/**
* Prepend a path to relative URIs in CSS files
*
* @param string $css
*
* @param string $path The path to prepend.
*
* @return string
*/
public static function prepend($css, $path)
{
self::$_prepend_path = $path;
$css = self::_trim_urls($css);
// append
$css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/', array(self::$class_name, '_process_uri_cb'), $css);
$css = preg_replace_callback('/url\\(\\s*([^\\)\\s]+)\\s*\\)/', array(self::$class_name, '_process_uri_cb'), $css);
$css = preg_replace_callback('/src=\'\\s*([^\\)\\s]+)\\s*\'/', array(self::$class_name, '_process_src_cb'), $css);
self::$_prepend_path = null;
return $css;
}