{% extends "base/class.php.twig" %}

{% block file_path %}
\Drupal\{{ module }}\Plugin\Field\FieldFormatter\{{ class_name }}.
{% endblock %}

{% block namespace_class %}
namespace Drupal\{{ module }}\Plugin\Field\FieldFormatter;
{% endblock %}

{% block use_class %}
use Drupal\Component\Utility\Html;
use Drupal\Core\Field\FieldItemInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\Form\FormStateInterface;
{% endblock %}

{% block class_declaration %}
/**
 * Plugin implementation of the '{{ plugin_id }}' formatter.
 *
 * @FieldFormatter(
 *   id = "{{ plugin_id }}",
 *   label = @Translation("{{ label }}"){% if field_type %},
 *   field_types = {
 *     "{{ field_type }}"
 *   }
{% else %}

 *   At least one field_types annotation array entry is necessary to display this formatter in the UI.
 *   ex. field_types = { "field_type" }
{% endif %}
 * )
 */
class {{ class_name }} extends FormatterBase {% endblock %}
{% block class_methods %}
  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
      // Implement default settings.
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    return [
      // Implement settings form.
    ] + parent::settingsForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = [];
    // Implement settings summary.

    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];

    foreach ($items as $delta => $item) {
      $elements[$delta] = ['#markup' => $this->viewValue($item)];
    }

    return $elements;
  }

  /**
   * Generate the output appropriate for one field item.
   *
   * @param \Drupal\Core\Field\FieldItemInterface $item
   *   One field item.
   *
   * @return string
   *   The textual output generated.
   */
  protected function viewValue(FieldItemInterface $item) {
    // The text value has no text format assigned to it, so the user input
    // should equal the output, including newlines.
    return nl2br(Html::escape($item->value));
  }
{% endblock %}