OEL-1167: Preprocess variables for the language switcher template.

modules/oe_whitelabel_multilingual/oe_whitelabel_multilingual.module

+<?php
+
+/**
+ * @file
+ * OE Whitelabel theme Multilingual.
+ */
+
+declare(strict_types =  1);
+
+use Drupal\oe_whitelabel_helper\EuropeanUnionLanguages;
+
+/**
+ * Implements hook_preprocess_links().
+ */
+function oe_whitelabel_multilingual_preprocess_links__oe_multilingual_content_language_block(array &$variables): void {
+  // Generate the label for the unavailable language.
+  $currentLanguage = \Drupal::languageManager()->getCurrentLanguage();
+  $current_language_id = $currentLanguage->getId();
+  $variables['unavailable_language'] = $currentLanguage->getName();
+
+  foreach ($variables['links'] as $language_code => $link) {
+    // Handle both cases (block, page) when the link array structure differ.
+    if (isset($link['link'])) {
+      /** @var \Drupal\Core\Url $url */
+      $url = $link['link']['#url'];
+      $href = $url
+        ->setOptions($link['link']['#options'])
+        ->setAbsolute(TRUE)
+        ->toString();
+      $label = $link['link']['#title'];
+    }
+    else {
+      $href = $link['#url']->toString();
+      $label = $link['#title'];
+    }
+
+    $language_internal = $language_code;
+    if (EuropeanUnionLanguages::hasLanguage($language_code)) {
+      $language_internal = EuropeanUnionLanguages::getInternalLanguageCode($language_code);
+    }
+
+    $language = [
+      'path' => $href,
+      'label' => $label,
+      // Pass original language code which can be useful for some other
+      // preprocessors.
+      'hreflang' => $language_code,
+      'lang' => $language_internal,
+    ];
+
+    if (!empty($current_language_id) && $language_code === $current_language_id) {
+      $variables['current_language'] = [
+        'path' => $href,
+        'hreflang' => $language_code,
+        'lang' => $language_internal,
+        'label' => $link['link']['#title'],
+      ];
+      $language['active'] = TRUE;
+    }
+
+    $variables['languages'][] = $language;
+  }
+}
+
+/**
+ * Implements hook__preprocess_links__language_block().
+ */
+function oe_whitelabel_multilingual_preprocess_links__language_block(&$variables) {
+  $currentLanguage = \Drupal::languageManager()->getCurrentLanguage();
+  $current_language_id = $currentLanguage->getId();
+  $language_config_storage = \Drupal::entityTypeManager()->getStorage('configurable_language');
+  $eu_links = [];
+  $non_eu_links = [];
+
+  foreach ($variables['links'] as $language_code => $link) {
+    /** @var \Drupal\Core\Url $url */
+    $url = $link['link']['#url'];
+    $href = $url
+      ->setOptions($link['link']['#options'])
+      ->setAbsolute(TRUE)
+      ->toString();
+    $label = $link['link']['#title'];
+
+    $link = [
+      'href' => $href,
+      'name' => $label,
+      'id' => 'link_' . $language_code,
+      'hreflang' => $language_code,
+    ];
+
+    if (!empty($current_language_id) && $language_code === $current_language_id) {
+      $variables['language']['link'] = $link;
+      $variables['language']['link']['target'] = 'languageModal';
+      $link['active'] = TRUE;
+    }
+
+    $language_config = $language_config_storage->load($language_code);
+    $category = $language_config->getThirdPartySetting('oe_multilingual', 'category');
+
+    if ($category === 'eu') {
+      $eu_links[$language_code] = $link;
+    }
+    else {
+      $non_eu_links[$language_code] = $link;
+    }
+  }
+
+  $variables['language']['modal'] = [
+    'id' => 'languageModal',
+    'size' => 'fullscreen',
+    'header' => [
+      'title' => t('Select your language'),
+      'label' => t('Close'),
+    ],
+    'eu_links' => $eu_links,
+    'non_eu_links' => $non_eu_links,
+    'footer' => [
+      'label' => t('Close'),
+    ],
+  ];
+}