function SelectLanguageForm::buildForm

Overrides FormInterface::buildForm

File

core/lib/Drupal/Core/Installer/Form/SelectLanguageForm.php, line 31

Class

SelectLanguageForm

Provides the language selection form.

Namespace

Code

public function buildForm(array $form, FormStateInterface $form_state, $install_state = NULL) {
    if (count($install_state['translations']) > 1) {
        $files = $install_state['translations'];
    }
    else {
        $files = [];
    }
    $standard_languages = LanguageManager::getStandardLanguageList();
    $select_options = [];
    $browser_options = [];
    $form['#title'] = 'Choose language';
    // Build a select list with language names in native language for the user
    // to choose from. And build a list of available languages for the browser
    // to select the language default from.
    // Select lists based on all standard languages.
    foreach ($standard_languages as $langcode => $language_names) {
        $select_options[$langcode] = $language_names[1];
        $browser_options[$langcode] = $langcode;
    }
    // Add languages based on language files in the translations directory.
    if (count($files)) {
        foreach ($files as $langcode => $uri) {
            $select_options[$langcode] = isset($standard_languages[$langcode]) ? $standard_languages[$langcode][1] : $langcode;
            $browser_options[$langcode] = $langcode;
        }
    }
    asort($select_options);
    $request = Request::createFromGlobals();
    $browser_langcode = UserAgent::getBestMatchingLangcode($request->server
        ->get('HTTP_ACCEPT_LANGUAGE', ''), $browser_options);
    $form['langcode'] = [
        '#type' => 'select',
        '#title' => 'Choose language',
        '#title_display' => 'invisible',
        '#options' => $select_options,
        // Use the browser detected language as default or English if nothing found.
'#default_value' => !empty($browser_langcode) ? $browser_langcode : 'en',
    ];
    $link_to_english = install_full_redirect_url([
        'parameters' => [
            'langcode' => 'en',
        ],
    ]);
    $form['help'] = [
        '#type' => 'item',
        // #markup is XSS admin filtered which ensures unsafe protocols will be
        // removed from the url.
'#markup' => '<p>Translations will be downloaded from the <a href="https://localize.drupal.org/download">Drupal Translation website</a>. If you do not want this, select <a href="' . $link_to_english . '">English</a>.</p>',
        '#states' => [
            'invisible' => [
                'select[name="langcode"]' => [
                    'value' => 'en',
                ],
            ],
        ],
    ];
    $form['actions'] = [
        '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
        '#type' => 'submit',
        '#value' => 'Save and continue',
        '#button_type' => 'primary',
    ];
    return $form;
}