/**
 * Implements comment strip logic.
 *
 * This is the callback function for the preg_replace_callback() used in
 * drupal_load_stylesheet_content(). Support for comment hacks is implemented here.
 */
function _process_comment($matches) {
  static $keep_nextone = FALSE;
  // Quoted string, keep it.
  $start_char = substr($matches[0], 0, 1);
  if ($start_char == "'" || $start_char == '"') {
    return $matches[0];
  }
  // End of IE-Mac hack, keep it.
  if ($keep_nextone) {
    $keep_nextone = FALSE;
    return $matches[0];
  }
  else {
    switch (strrpos($matches[0], '\\')) {
      // No backslash, strip it.
      case FALSE :
        return '';
        break;
      // Ends with \*/ so is a multi line IE-Mac hack, keep this and the next one.
      case drupal_strlen($matches[0])-3 :
        $keep_nextone = TRUE;
        return '/* \*/';
      // Single line IE-Mac hack, keep this.
      default :
        return '/*\ */';
    }
  }
}