/**
* Rewrite file relative URIs as root relative in CSS files
*
* @param string $css
*
* @param string $current_dir The directory of the current CSS file.
*
* @param string $doc_root The document root of the web site in which
* the CSS file resides (default = $_SERVER['DOCUMENT_ROOT']).
*
* @param array $symlinks (default = array()) If the CSS file is stored in
* a symlink-ed directory, provide an array of link paths to
* target paths, where the link paths are within the document root. Because
* paths need to be normalized for this to work, use "//" to substitute
* the doc root in the link paths (the array keys). E.g.:
* <code>
* array('//symlink' => '/real/target/path') // unix
* array('//static' => 'D:\\staticStorage') // Windows
* </code>
*
* @return string
*/
public static function rewrite($css, $current_dir, $doc_root = null, $symlinks = array())
{
self::$_doc_root = self::_realpath($doc_root ? $doc_root : $_SERVER['DOCUMENT_ROOT']);
self::$_current_dir = self::_realpath($current_dir);
self::$_symlinks = array();
// normalize symlinks
foreach ($symlinks as $link => $target) {
$link = $link === '//' ? self::$_doc_root : str_replace('//', self::$_doc_root . '/', $link);
$link = strtr($link, '/', DIRECTORY_SEPARATOR);
self::$_symlinks[$link] = self::_realpath($target);
}
self::$debug_text .= "doc_root : " . self::$_doc_root . "\n" . "current_dir : " . self::$_current_dir . "\n";
if (self::$_symlinks) {
self::$debug_text .= "symlinks : " . var_export(self::$_symlinks, 1) . "\n";
}
self::$debug_text .= "\n";
$css = self::_trim_urls($css);
// rewrite
$css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/', array(self::$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);
return $css;
}