public static function rewrite_css($css, $before_dir, $after_dir)
{
// Normalise slashes
$before_dir = str_replace('\\', '/', $before_dir);
$after_dir = str_replace('\\', '/', $after_dir);
// Make sure before_dir and after_dir have trailing slashes
$before_dir = rtrim($before_dir, '/') . '/';
$after_dir = rtrim($after_dir, '/') . '/';
// Trim off common leading prefix
$i = 0;
for (; $i < strlen($after_dir); $i++) {
if ($after_dir[$i] != $before_dir[$i]) {
break;
}
}
// If we quit on the first loop, $i holds first index of mismatch, otherwise last index of match
$i = max($i - 1, 0);
$after_dir = substr($after_dir, $i);
$before_dir = substr($before_dir, $i);
// Move back out of the dir that the file ends up in
// then back into the dir the file was in before
$rel = str_repeat('../', substr_count($after_dir, '/')) . $before_dir;
// return $css;
$css = preg_replace_callback(static::PATTERN, function ($m) use($rel) {
list($match, $type, $quote, $url) = $m;
if (strpos($url, 'data:') === 0 || strpos($url, '://') !== false) {
return $match;
}
// PHP anonymous function binding fail
$rel_url = Casset_Cssurirewriterrelative::tidy_url("{$rel}{$url}");
return "{$type}({$quote}{$rel_url}{$quote})";
}, $css);
return $css;
}
/**
* Selects the correct css uri rewriter, and applies it
*
* @param string $content the contents of the file to rewrite
* @param string $filename the original location of the file
* @param string $destination_filename the name of the file where the css will be written to
* @return string The re-written content
*/
protected static function css_rewrite_uris($content, $filename, $destination_filename)
{
switch (static::$css_uri_rewriter) {
case 'absolute':
$rewritten = Casset_Cssurirewriter::rewrite($content, dirname($filename));
break;
case 'relative':
$rewritten = Casset_Cssurirewriterrelative::rewrite_css($content, dirname($filename), dirname($destination_filename));
break;
case 'none':
$rewritten = $content;
break;
default:
throw new Casset_Exception('Unknown CSS URI rewriter: ' . static::$css_uri_rewriter);
break;
}
return $rewritten;
}
