class TokenizeAreaPluginBase

abstract class TokenizeAreaPluginBase extends AreaPluginBase {
  
  /**
   * {@inheritdoc}
   */
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['tokenize'] = [
      'default' => FALSE,
    ];
    return $options;
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);
    // Add tokenization form elements.
    $this->tokenForm($form, $form_state);
  }
  
  /**
   * Adds tokenization form elements.
   */
  public function tokenForm(&$form, FormStateInterface $form_state) {
    $form['tokenize'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Use replacement tokens from the first row'),
      '#default_value' => $this->options['tokenize'],
    ];
    // Get a list of the available fields and arguments for token replacement.
    $options = [];
    $optgroup_arguments = (string) $this->t('Arguments');
    $optgroup_fields = (string) $this->t('Fields');
    foreach ($this->view->display_handler
      ->getHandlers('field') as $field => $handler) {
      $options[$optgroup_fields]["{{ {$field} }}"] = $handler->adminLabel();
    }
    foreach ($this->view->display_handler
      ->getHandlers('argument') as $arg => $handler) {
      $options[$optgroup_arguments]["{{ arguments.{$arg} }}"] = $this->t('@argument title', [
        '@argument' => $handler->adminLabel(),
      ]);
      $options[$optgroup_arguments]["{{ raw_arguments.{$arg} }}"] = $this->t('@argument input', [
        '@argument' => $handler->adminLabel(),
      ]);
    }
    if (!empty($options)) {
      $form['tokens'] = [
        '#type' => 'details',
        '#title' => $this->t('Replacement patterns'),
        '#open' => TRUE,
        '#id' => 'edit-options-token-help',
        '#states' => [
          'visible' => [
            ':input[name="options[tokenize]"]' => [
              'checked' => TRUE,
            ],
          ],
        ],
      ];
      $form['tokens']['help'] = [
        '#markup' => '<p>' . $this->t('The following tokens are available. You may use Twig syntax in this field.') . '</p>',
      ];
      foreach (array_keys($options) as $type) {
        if (!empty($options[$type])) {
          $items = [];
          foreach ($options[$type] as $key => $value) {
            $items[] = $key . ' == ' . $value;
          }
          $form['tokens'][$type]['tokens'] = [
            '#theme' => 'item_list',
            '#items' => $items,
          ];
        }
      }
      $form['tokens']['html_help'] = [
        '#markup' => '<p>' . $this->t('You may include the following allowed HTML tags with these "Replacement patterns": <code>@tags</code>', [
          '@tags' => '<' . implode('> <', Xss::getAdminTagList()) . '>',
        ]) . '</p>',
      ];
    }
    $this->globalTokenForm($form, $form_state);
  }
  
  /**
   * Replaces value with special views tokens and global tokens.
   *
   * @param string $value
   *   The value to eventually tokenize.
   *
   * @return string
   *   Tokenized value if tokenize option is enabled. In any case global tokens
   *   will be replaced.
   */
  public function tokenizeValue($value) {
    if ($this->options['tokenize']) {
      $value = $this->view
        ->getStyle()
        ->tokenizeValue($value, 0);
    }
    // As we add the globalTokenForm() we also should replace the token here.
    return $this->globalTokenReplace($value);
  }

}