class LanguageManager

class LanguageManager implements LanguageManagerInterface {
    use DependencySerializationTrait;
    
    /**
     * A static cache of translated language lists.
     *
     * Array of arrays to cache the result of self::getLanguages() keyed by the
     * language the list is translated to (first level) and the flags provided to
     * the method (second level).
     *
     * @var \Drupal\Core\Language\LanguageInterface[]
     *
     * @see \Drupal\Core\Language\LanguageManager::getLanguages()
     */
    protected $languages = [];
    
    /**
     * The default language object.
     *
     * @var \Drupal\Core\Language\LanguageDefault
     */
    protected $defaultLanguage;
    
    /**
     * Information about all defined language types.
     */
    protected $definedLanguageTypesInfo;
    
    /**
     * Constructs the language manager.
     *
     * @param \Drupal\Core\Language\LanguageDefault $default_language
     *   The default language.
     */
    public function __construct(LanguageDefault $default_language) {
        $this->defaultLanguage = $default_language;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isMultilingual() {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLanguageTypes() {
        return [
            LanguageInterface::TYPE_INTERFACE,
            LanguageInterface::TYPE_CONTENT,
            LanguageInterface::TYPE_URL,
        ];
    }
    
    /**
     * Returns information about all defined language types.
     *
     * Defines the three core language types:
     * - Interface language is the only configurable language type in core. It is
     *   used by t() as the default language if none is specified.
     * - Content language is by default non-configurable and inherits the
     *   interface language negotiated value. It is used by the Field API to
     *   determine the display language for fields if no explicit value is
     *   specified.
     * - URL language is by default non-configurable and is determined through the
     *   URL language negotiation method or the URL fallback language negotiation
     *   method if no language can be detected. It is used by l() as the default
     *   language if none is specified.
     *
     * @return array
     *   An associative array of language type information arrays keyed by
     *   language type machine name, in the format of
     *   hook_language_types_info().
     */
    public function getDefinedLanguageTypesInfo() {
        $this->definedLanguageTypesInfo = [
            LanguageInterface::TYPE_INTERFACE => [
                'name' => new TranslatableMarkup('Interface text'),
                'description' => new TranslatableMarkup('Order of language detection methods for interface text. If a translation of interface text is available in the detected language, it will be displayed.'),
                'locked' => TRUE,
            ],
            LanguageInterface::TYPE_CONTENT => [
                'name' => new TranslatableMarkup('Content'),
                'description' => new TranslatableMarkup('Order of language detection methods for content. If a version of content is available in the detected language, it will be displayed.'),
                'locked' => TRUE,
            ],
            LanguageInterface::TYPE_URL => [
                'locked' => TRUE,
            ],
        ];
        return $this->definedLanguageTypesInfo;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCurrentLanguage($type = LanguageInterface::TYPE_INTERFACE) {
        return $this->getDefaultLanguage();
    }
    
    /**
     * {@inheritdoc}
     */
    public function reset($type = NULL) {
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultLanguage() {
        return $this->defaultLanguage
            ->get();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLanguages($flags = LanguageInterface::STATE_CONFIGURABLE) {
        $static_cache_id = $this->getCurrentLanguage()
            ->getId();
        if (!isset($this->languages[$static_cache_id][$flags])) {
            // If this language manager is used, there are no configured languages.
            // The default language and locked languages comprise the full language
            // list.
            $default = $this->getDefaultLanguage();
            $languages = [
                $default->getId() => $default,
            ];
            $languages += $this->getDefaultLockedLanguages($default->getWeight());
            // Filter the full list of languages based on the value of $flags.
            $this->languages[$static_cache_id][$flags] = $this->filterLanguages($languages, $flags);
        }
        return $this->languages[$static_cache_id][$flags];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getNativeLanguages() {
        // In a language unaware site we don't have translated languages.
        return $this->getLanguages();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLanguage($langcode) {
        $languages = $this->getLanguages(LanguageInterface::STATE_ALL);
        return $languages[$langcode] ?? NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLanguageName($langcode) {
        if ($langcode == LanguageInterface::LANGCODE_NOT_SPECIFIED) {
            return new TranslatableMarkup('None');
        }
        if ($language = $this->getLanguage($langcode)) {
            return $language->getName();
        }
        if (empty($langcode)) {
            return new TranslatableMarkup('Unknown');
        }
        return new TranslatableMarkup('Unknown (@langcode)', [
            '@langcode' => $langcode,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultLockedLanguages($weight = 0) {
        $languages = [];
        $locked_language = [
            'default' => FALSE,
            'locked' => TRUE,
            'direction' => LanguageInterface::DIRECTION_LTR,
        ];
        // This is called very early while initializing the language system. Prevent
        // early t() calls by using the TranslatableMarkup.
        $languages[LanguageInterface::LANGCODE_NOT_SPECIFIED] = new Language([
            'id' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
            'name' => new TranslatableMarkup('Not specified'),
            'weight' => ++$weight,
        ] + $locked_language);
        $languages[LanguageInterface::LANGCODE_NOT_APPLICABLE] = new Language([
            'id' => LanguageInterface::LANGCODE_NOT_APPLICABLE,
            'name' => new TranslatableMarkup('Not applicable'),
            'weight' => ++$weight,
        ] + $locked_language);
        return $languages;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isLanguageLocked($langcode) {
        $language = $this->getLanguage($langcode);
        return $language ? $language->isLocked() : FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFallbackCandidates(array $context = []) {
        return [
            LanguageInterface::LANGCODE_DEFAULT,
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLanguageSwitchLinks($type, Url $url) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getStandardLanguageList() {
        // This list is based on languages available from localize.drupal.org. See
        // http://localize.drupal.org/issues for information on how to add languages
        // there.
        //
        // The "Left-to-right marker" comments and the enclosed UTF-8 markers are to
        // make otherwise strange looking PHP syntax natural (to not be displayed in
        // right to left). See https://www.drupal.org/node/128866#comment-528929.
        // cSpell:disable
        return [
            'af' => [
                'Afrikaans',
                'Afrikaans',
            ],
            'am' => [
                'Amharic',
                'አማርኛ',
            ],
            'ar' => [
                'Arabic',
                
                /* Left-to-right marker "‭" */
'العربية',
                LanguageInterface::DIRECTION_RTL,
            ],
            'ast' => [
                'Asturian',
                'Asturianu',
            ],
            'az' => [
                'Azerbaijani',
                'Azərbaycanca',
            ],
            'be' => [
                'Belarusian',
                'Беларуская',
            ],
            'bg' => [
                'Bulgarian',
                'Български',
            ],
            'bn' => [
                'Bengali',
                'বাংলা',
            ],
            'bo' => [
                'Tibetan',
                'བོད་སྐད་',
            ],
            'bs' => [
                'Bosnian',
                'Bosanski',
            ],
            'ca' => [
                'Catalan',
                'Català',
            ],
            'cs' => [
                'Czech',
                'Čeština',
            ],
            'cy' => [
                'Welsh',
                'Cymraeg',
            ],
            'da' => [
                'Danish',
                'Dansk',
            ],
            'de' => [
                'German',
                'Deutsch',
            ],
            'dz' => [
                'Dzongkha',
                'རྫོང་ཁ',
            ],
            'el' => [
                'Greek',
                'Ελληνικά',
            ],
            'en' => [
                'English',
                'English',
            ],
            'en-x-simple' => [
                'Simple English',
                'Simple English',
            ],
            'eo' => [
                'Esperanto',
                'Esperanto',
            ],
            'es' => [
                'Spanish',
                'Español',
            ],
            'et' => [
                'Estonian',
                'Eesti',
            ],
            'eu' => [
                'Basque',
                'Euskera',
            ],
            'fa' => [
                'Persian, Farsi',
                
                /* Left-to-right marker "‭" */
'فارسی',
                LanguageInterface::DIRECTION_RTL,
            ],
            'fi' => [
                'Finnish',
                'Suomi',
            ],
            'fil' => [
                'Filipino',
                'Filipino',
            ],
            'fo' => [
                'Faeroese',
                'Føroyskt',
            ],
            'fr' => [
                'French',
                'Français',
            ],
            'fy' => [
                'Frisian, Western',
                'Frysk',
            ],
            'ga' => [
                'Irish',
                'Gaeilge',
            ],
            'gd' => [
                'Scots Gaelic',
                'Gàidhlig',
            ],
            'gl' => [
                'Galician',
                'Galego',
            ],
            'gsw-berne' => [
                'Swiss German',
                'Schwyzerdütsch',
            ],
            'gu' => [
                'Gujarati',
                'ગુજરાતી',
            ],
            'he' => [
                'Hebrew',
                
                /* Left-to-right marker "‭" */
'עברית',
                LanguageInterface::DIRECTION_RTL,
            ],
            'hi' => [
                'Hindi',
                'हिन्दी',
            ],
            'hr' => [
                'Croatian',
                'Hrvatski',
            ],
            'ht' => [
                'Haitian Creole',
                'Kreyòl ayisyen',
            ],
            'hu' => [
                'Hungarian',
                'Magyar',
            ],
            'hy' => [
                'Armenian',
                'Հայերեն',
            ],
            'id' => [
                'Indonesian',
                'Bahasa Indonesia',
            ],
            'is' => [
                'Icelandic',
                'Íslenska',
            ],
            'it' => [
                'Italian',
                'Italiano',
            ],
            'ja' => [
                'Japanese',
                '日本語',
            ],
            'jv' => [
                'Javanese',
                'Basa Java',
            ],
            'ka' => [
                'Georgian',
                'ქართული ენა',
            ],
            'kk' => [
                'Kazakh',
                'Қазақ',
            ],
            'km' => [
                'Khmer',
                'ភាសាខ្មែរ',
            ],
            'kn' => [
                'Kannada',
                'ಕನ್ನಡ',
            ],
            'ko' => [
                'Korean',
                '한국어',
            ],
            'ku' => [
                'Kurdish',
                'Kurdî',
            ],
            'ky' => [
                'Kyrgyz',
                'Кыргызча',
            ],
            'lo' => [
                'Lao',
                'ພາສາລາວ',
            ],
            'lt' => [
                'Lithuanian',
                'Lietuvių',
            ],
            'lv' => [
                'Latvian',
                'Latviešu',
            ],
            'mg' => [
                'Malagasy',
                'Malagasy',
            ],
            'mk' => [
                'Macedonian',
                'Македонски',
            ],
            'ml' => [
                'Malayalam',
                'മലയാളം',
            ],
            'mn' => [
                'Mongolian',
                'монгол',
            ],
            'mr' => [
                'Marathi',
                'मराठी',
            ],
            'ms' => [
                'Bahasa Malaysia',
                'بهاس ملايو',
            ],
            'my' => [
                'Burmese',
                'ဗမာစကား',
            ],
            'ne' => [
                'Nepali',
                'नेपाली',
            ],
            'nl' => [
                'Dutch',
                'Nederlands',
            ],
            'nb' => [
                'Norwegian Bokmål',
                'Norsk, bokmål',
            ],
            'nn' => [
                'Norwegian Nynorsk',
                'Norsk, nynorsk',
            ],
            'oc' => [
                'Occitan',
                'Occitan',
            ],
            'pa' => [
                'Punjabi',
                'ਪੰਜਾਬੀ',
            ],
            'pl' => [
                'Polish',
                'Polski',
            ],
            'pt-pt' => [
                'Portuguese, Portugal',
                'Português, Portugal',
            ],
            'pt-br' => [
                'Portuguese, Brazil',
                'Português, Brasil',
            ],
            'ro' => [
                'Romanian',
                'Română',
            ],
            'ru' => [
                'Russian',
                'Русский',
            ],
            'sco' => [
                'Scots',
                'Scots',
            ],
            'se' => [
                'Northern Sami',
                'Sámi',
            ],
            'si' => [
                'Sinhala',
                'සිංහල',
            ],
            'sk' => [
                'Slovak',
                'Slovenčina',
            ],
            'sl' => [
                'Slovenian',
                'Slovenščina',
            ],
            'sq' => [
                'Albanian',
                'Shqip',
            ],
            'sr' => [
                'Serbian',
                'Српски',
            ],
            'sv' => [
                'Swedish',
                'Svenska',
            ],
            'sw' => [
                'Swahili',
                'Kiswahili',
            ],
            'ta' => [
                'Tamil',
                'தமிழ்',
            ],
            'ta-lk' => [
                'Tamil, Sri Lanka',
                'தமிழ், இலங்கை',
            ],
            'te' => [
                'Telugu',
                'తెలుగు',
            ],
            'th' => [
                'Thai',
                'ภาษาไทย',
            ],
            'tr' => [
                'Turkish',
                'Türkçe',
            ],
            'tyv' => [
                'Tuvan',
                'Тыва дыл',
            ],
            'ug' => [
                'Uyghur',
                
                /* Left-to-right marker "‭" */
'ئۇيغۇرچە',
                LanguageInterface::DIRECTION_RTL,
            ],
            'uk' => [
                'Ukrainian',
                'Українська',
            ],
            'ur' => [
                'Urdu',
                
                /* Left-to-right marker "‭" */
'اردو',
                LanguageInterface::DIRECTION_RTL,
            ],
            'vi' => [
                'Vietnamese',
                'Tiếng Việt',
            ],
            'xx-lolspeak' => [
                'Lolspeak',
                'Lolspeak',
            ],
            'zh-hans' => [
                'Chinese, Simplified',
                '简体中文',
            ],
            'zh-hant' => [
                'Chinese, Traditional',
                '繁體中文',
            ],
        ];
        // cSpell:enable
    }
    
    /**
     * The 6 official languages used at the United Nations.
     *
     * This list is based on https://www.un.org/en/our-work/official-languages
     * and it uses the same format as getStandardLanguageList().
     *
     * @return array
     *   An array with language codes as keys, and English and native language
     *   names as values.
     */
    public static function getUnitedNationsLanguageList() {
        // cSpell:disable
        return [
            'ar' => [
                'Arabic',
                
                /* Left-to-right marker "‭" */
'العربية',
                LanguageInterface::DIRECTION_RTL,
            ],
            'zh-hans' => [
                'Chinese, Simplified',
                '简体中文',
            ],
            'en' => [
                'English',
                'English',
            ],
            'fr' => [
                'French',
                'Français',
            ],
            'ru' => [
                'Russian',
                'Русский',
            ],
            'es' => [
                'Spanish',
                'Español',
            ],
        ];
        // cSpell:enable
    }
    
    /**
     * Sets the configuration override language.
     *
     * This function is a noop since the configuration cannot be overridden by
     * language unless the Language module is enabled. That replaces the default
     * language manager with a configurable language manager.
     *
     * @param \Drupal\Core\Language\LanguageInterface $language
     *   The language to override configuration with.
     *
     * @return $this
     *
     * @see \Drupal\language\ConfigurableLanguageManager::setConfigOverrideLanguage()
     */
    public function setConfigOverrideLanguage(LanguageInterface $language = NULL) {
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfigOverrideLanguage() {
        return $this->getCurrentLanguage();
    }
    
    /**
     * Filters the full list of languages based on the value of the flag.
     *
     * The locked languages are removed by default.
     *
     * @param \Drupal\Core\Language\LanguageInterface[] $languages
     *   Array with languages to be filtered.
     * @param int $flags
     *   (optional) Specifies the state of the languages that have to be returned.
     *   It can be: LanguageInterface::STATE_CONFIGURABLE,
     *   LanguageInterface::STATE_LOCKED, or LanguageInterface::STATE_ALL.
     *
     * @return \Drupal\Core\Language\LanguageInterface[]
     *   An associative array of languages, keyed by the language code.
     */
    protected function filterLanguages(array $languages, $flags = LanguageInterface::STATE_CONFIGURABLE) {
        // STATE_ALL means we don't actually filter, so skip the rest of the method.
        if ($flags == LanguageInterface::STATE_ALL) {
            return $languages;
        }
        $filtered_languages = [];
        // Add the site's default language if requested.
        if ($flags & LanguageInterface::STATE_SITE_DEFAULT) {
            // Setup a language to have the defaults with data appropriate of the
            // default language only for runtime.
            $defaultLanguage = $this->getDefaultLanguage();
            $default = new Language([
                'id' => $defaultLanguage->getId(),
                'name' => new TranslatableMarkup("Site's default language (@lang_name)", [
                    '@lang_name' => $defaultLanguage->getName(),
                ]),
                'direction' => $defaultLanguage->getDirection(),
                'weight' => $defaultLanguage->getWeight(),
            ]);
            $filtered_languages[LanguageInterface::LANGCODE_SITE_DEFAULT] = $default;
        }
        foreach ($languages as $id => $language) {
            if ($language->isLocked() && $flags & LanguageInterface::STATE_LOCKED || !$language->isLocked() && $flags & LanguageInterface::STATE_CONFIGURABLE) {
                $filtered_languages[$id] = $language;
            }
        }
        return $filtered_languages;
    }

}