NegotiationUrlForm::buildForm

public NegotiationUrlForm::buildForm(array $form, FormStateInterface $form_state)

public function buildForm(array $form, FormStateInterface $form_state) {
  global $base_url;
  $config = $this->config('language.negotiation');

  $form['language_negotiation_url_part'] = array(
    '#title' => $this->t('Part of the URL that determines language'),
    '#type' => 'radios',
    '#options' => array(
      LanguageNegotiationUrl::CONFIG_PATH_PREFIX => $this->t('Path prefix'),
      LanguageNegotiationUrl::CONFIG_DOMAIN => $this->t('Domain'),
    ),
    '#default_value' => $config->get('url.source'),
  );

  $form['prefix'] = array(
    '#type' => 'details',
    '#tree' => TRUE,
    '#title' => $this->t('Path prefix configuration'),
    '#open' => TRUE,
    '#description' => $this->t('Language codes or other custom text to use as a path prefix for URL language detection. For the selected fallback language, this value may be left blank. <strong>Modifying this value may break existing URLs. Use with caution in a production environment.</strong> Example: Specifying "deutsch" as the path prefix code for German results in URLs like "example.com/deutsch/contact".'),
    '#states' => array(
      'visible' => array(
        ':input[name="language_negotiation_url_part"]' => array(
          'value' => (string) LanguageNegotiationUrl::CONFIG_PATH_PREFIX,
        ),
      ),
    ),
  );
  $form['domain'] = array(
    '#type' => 'details',
    '#tree' => TRUE,
    '#title' => $this->t('Domain configuration'),
    '#open' => TRUE,
    '#description' => $this->t('The domain names to use for these languages. <strong>Modifying this value may break existing URLs. Use with caution in a production environment.</strong> Example: Specifying "de.example.com" as language domain for German will result in a URL like "http://de.example.com/contact".'),
    '#states' => array(
      'visible' => array(
        ':input[name="language_negotiation_url_part"]' => array(
          'value' => (string) LanguageNegotiationUrl::CONFIG_DOMAIN,
        ),
      ),
    ),
  );

  $languages = $this->languageManager->getLanguages();
  $prefixes = $config->get('url.prefixes');
  $domains = $config->get('url.domains');
  foreach ($languages as $langcode => $language) {
    $t_args = array('%language' => $language->getName(), '%langcode' => $language->getId());
    $form['prefix'][$langcode] = array(
      '#type' => 'textfield',
      '#title' => $language->isDefault() ? $this->t('%language (%langcode) path prefix (Default language)', $t_args) : $this->t('%language (%langcode) path prefix', $t_args),
      '#maxlength' => 64,
      '#default_value' => isset($prefixes[$langcode]) ? $prefixes[$langcode] : '',
      '#field_prefix' => $base_url . '/',
    );
    $form['domain'][$langcode] = array(
      '#type' => 'textfield',
      '#title' => $this->t('%language (%langcode) domain', array('%language' => $language->getName(), '%langcode' => $language->getId())),
      '#maxlength' => 128,
      '#default_value' => isset($domains[$langcode]) ? $domains[$langcode] : '',
    );
  }

  $form_state->setRedirect('language.negotiation');

  return parent::buildForm($form, $form_state);
}