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1 <?php
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2
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3 namespace Drupal\language\Plugin\Block;
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4
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5 use Drupal\Core\Access\AccessResult;
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6 use Drupal\Core\Block\BlockBase;
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7 use Drupal\Core\Path\PathMatcherInterface;
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8 use Drupal\Core\Session\AccountInterface;
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9 use Drupal\Core\Language\LanguageManagerInterface;
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10 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
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11 use Drupal\Core\Url;
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12 use Symfony\Component\DependencyInjection\ContainerInterface;
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13
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14 /**
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15 * Provides a 'Language switcher' block.
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16 *
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17 * @Block(
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18 * id = "language_block",
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19 * admin_label = @Translation("Language switcher"),
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20 * category = @Translation("System"),
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21 * deriver = "Drupal\language\Plugin\Derivative\LanguageBlock"
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22 * )
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23 */
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24 class LanguageBlock extends BlockBase implements ContainerFactoryPluginInterface {
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25
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26 /**
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27 * The language manager.
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28 *
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29 * @var \Drupal\Core\Language\LanguageManagerInterface
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30 */
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31 protected $languageManager;
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32
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33 /**
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34 * The path matcher.
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35 *
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36 * @var \Drupal\Core\Path\PathMatcherInterface
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37 */
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38 protected $pathMatcher;
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39
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40 /**
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41 * Constructs an LanguageBlock object.
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42 *
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43 * @param array $configuration
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44 * A configuration array containing information about the plugin instance.
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45 * @param string $plugin_id
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46 * The plugin_id for the plugin instance.
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47 * @param mixed $plugin_definition
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48 * The plugin implementation definition.
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49 * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
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50 * The language manager.
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51 * @param \Drupal\Core\Path\PathMatcherInterface $path_matcher
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52 * The path matcher.
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53 */
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54 public function __construct(array $configuration, $plugin_id, $plugin_definition, LanguageManagerInterface $language_manager, PathMatcherInterface $path_matcher) {
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55 parent::__construct($configuration, $plugin_id, $plugin_definition);
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56 $this->languageManager = $language_manager;
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57 $this->pathMatcher = $path_matcher;
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58 }
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59
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60 /**
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61 * {@inheritdoc}
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62 */
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63 public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
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64 return new static(
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65 $configuration,
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66 $plugin_id,
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67 $plugin_definition,
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68 $container->get('language_manager'),
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69 $container->get('path.matcher')
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70 );
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71 }
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72
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73 /**
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74 * {@inheritdoc}
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75 */
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76 protected function blockAccess(AccountInterface $account) {
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77 $access = $this->languageManager->isMultilingual() ? AccessResult::allowed() : AccessResult::forbidden();
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78 return $access->addCacheTags(['config:configurable_language_list']);
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79 }
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80
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81 /**
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82 * {@inheritdoc}
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83 */
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84 public function build() {
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85 $build = [];
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86 $route_name = $this->pathMatcher->isFrontPage() ? '<front>' : '<current>';
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87 $type = $this->getDerivativeId();
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88 $links = $this->languageManager->getLanguageSwitchLinks($type, Url::fromRoute($route_name));
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89
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90 if (isset($links->links)) {
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91 $build = [
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92 '#theme' => 'links__language_block',
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93 '#links' => $links->links,
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94 '#attributes' => [
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95 'class' => [
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96 "language-switcher-{$links->method_id}",
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97 ],
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98 ],
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99 '#set_active_class' => TRUE,
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100 ];
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101 }
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102 return $build;
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103 }
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104
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105 /**
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106 * {@inheritdoc}
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107 *
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108 * @todo Make cacheable in https://www.drupal.org/node/2232375.
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109 */
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110 public function getCacheMaxAge() {
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111 return 0;
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112 }
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113
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114 }
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