DblogMessage.php

<?php

namespace Drupal\dblog\Plugin\views\field;

use Drupal\Component\Render\FormattableMarkup;
use Drupal\Core\Form\FormStateInterface;
use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\ResultRow;
use Drupal\views\ViewExecutable;
use Drupal\views\Plugin\views\display\DisplayPluginBase;

/**
 * Provides a field handler that renders a log event with replaced variables.
 *
 * @ingroup views_field_handlers
 *
 * @ViewsField("dblog_message")
 */
class DblogMessage extends FieldPluginBase {
  
  /**
   * {@inheritdoc}
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    if ($this->options['replace_variables']) {
      $this->additional_fields['variables'] = 'variables';
    }
  }
  
  /**
   * {@inheritdoc}
   */
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['replace_variables'] = [
      'default' => TRUE,
    ];
    return $options;
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);
    $form['replace_variables'] = [
      '#title' => $this->t('Replace variables'),
      '#type' => 'checkbox',
      '#default_value' => $this->options['replace_variables'],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function render(ResultRow $values) {
    $value = $this->getValue($values);
    if ($this->options['replace_variables']) {
      $variables = unserialize($this->getvalue($values, 'variables'));
      return new FormattableMarkup($value, (array) $variables);
    }
    else {
      return $this->sanitizeValue($value);
    }
  }

}