function pre_render($values) {
    $this->orig_alias = $this->options['id'];
  }

  function advanced_render($values) {
    $this->last_render = $value = $this->render($values);
    $this->original_value = $value;
    $field = $this->orig_alias;
    if ($this->options['type'] == 'separator') {
      $separator = check_plain($this->options['separator']);
    }
    if ($this->allow_advanced_render()) {
      $tokens = NULL;
      if (!empty($this->options['alter']['alter_text']) && !empty($this->options['alter']['text'])) {
        $tokens = $this->get_render_tokens();
        if (isset($separator)) {
          $data = explode($separator, $value);
        }
        foreach ($data as $key => $item) {
          $tokens['['. $field .']'] = $item;
          $data[$key] = $this->render_altered($tokens);
        }
      }

      if (!empty($this->options['alter']['trim']) && !empty($this->options['alter']['max_length'])) {
        $value = $this->render_trim_text($value);
      }

      if (!empty($this->options['alter']['make_link']) && !empty($this->options['alter']['path'])) {
        if (!isset($tokens)) {
         $tokens = $this->get_render_tokens();
        }
        if (isset($separator)) {
          $data = explode($separator, $value);
        }
        foreach ($data as $key => $item) {
          $tokens['['. $field .']'] = $item;
          $data[$key] = $this->render_as_link($item, $tokens);
        }
      }
      if (isset($separator)) {
        $value = implode($separator, $data);
      }
      // This happens here so that render_as_link can get the unaltered value of
      // this field as a token rather than the altered value.
      $this->last_render = $value;
    }

    return $this->last_render;
  }