language_negotiation_matrix-1.0.0-beta2/src/Plugin/KeyType/GenericLangcodeKeyType.php

<?php

namespace Drupal\language_negotiation_matrix\Plugin\KeyType;

use Drupal\Core\Form\FormStateInterface;
use Drupal\key\Plugin\KeyPluginFormInterface;
use Drupal\key\Plugin\KeyTypeBase;

/**
 * Defines a generic key type with a language association.
 *
 * @KeyType(
 *   id = "generic_langcode",
 *   label = @Translation("Generic with Langcode"),
 *   description = @Translation("A generic key type to use for passing environment variables that maps to a language id."),
 *   group = "generic",
 *   key_value = {
 *     "plugin" = "textarea_field"
 *   }
 * )
 */
class GenericLangcodeKeyType extends KeyTypeBase implements KeyPluginFormInterface {
  
  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'language' => '',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state): array {
    $languages = \Drupal::languageManager()->getLanguages();
    
    foreach ($languages as $language) {
      $options[$language->getId()] = $language->getName();
    }
    
    $form['language'] = [
      '#type' => 'select',
      '#title' => $this->t('Language'),
      '#description' => $this->t('The key will be matched to a language.'),
      '#options' => $options,
      '#default_value' => $this->getConfiguration()['language'],
      '#required' => TRUE,
    ];
    
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {}
  
  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state): void {
    $this->setConfiguration($form_state->getValues());
  }
  
  /**
   * {@inheritdoc}
   */
  public static function generateKeyValue(array $configuration): string {
    return '';
  }

  /**
   * {@inheritdoc}
   */
  public function validateKeyValue(array $form, FormStateInterface $form_state, $key_value): void {
    if (empty($key_value)) {
      return;
    }

    // If a field named "key_value" exists in the key input settings, use it for
    // the error element, if necessary. Otherwise, use the entire form.
    $error_element = $form['settings']['input_section']['key_input_settings']['key_value'] ?? $form;

    $value = $key_value;

    $definition = $this->getPluginDefinition();
    $fields = $definition['multivalue']['fields'];

    foreach ($fields as $id => $field) {
      if (!is_array($field)) {
        $field = ['label' => $field];
      }

      if (isset($field['required']) && $field['required'] === FALSE) {
        continue;
      }

      if (!isset($value[$id])) {
        $form_state->setError($error_element, $this->t('The key value is missing the field %field.', ['%field' => $id]));
      }
      elseif (empty($value[$id])) {
        $form_state->setError($error_element, $this->t('The key value field %field is empty.', ['%field' => $id]));
      }
    }
  }

}