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<?php | |
/** | |
* @file | |
* Contains \Drupal\language\LanguageNegotiatorInterface. | |
*/ | |
namespace Drupal\language; | |
use Drupal\Core\Session\AccountInterface; | |
/** | |
* Common interface for language negotiation services. | |
* | |
* The language negotiation API is based on two major concepts: | |
* - Language types: types of translatable data (the types of data that a user | |
* can view or request). | |
* - Language negotiation methods: responsible for determining which language to | |
* use to present a particular piece of data to the user. | |
* Both language types and language negotiation methods are customizable. | |
* | |
* Drupal defines three built-in language types: | |
* - Interface language: The page's main language, used to present translated | |
* user interface elements such as titles, labels, help text, and messages. | |
* - Content language: The language used to present content that is available | |
* in more than one language. | |
* - URL language: The language associated with URLs. When generating a URL, | |
* this value will be used for URL's as a default if no explicit preference is | |
* provided. | |
* Modules can define additional language types through | |
* hook_language_types_info(), and alter existing language type definitions | |
* through hook_language_types_info_alter(). | |
* | |
* Language types may be configurable or fixed. The language negotiation | |
* methods associated with a configurable language type can be explicitly | |
* set through the user interface. A fixed language type has predetermined | |
* (module-defined) language negotiation settings and, thus, does not appear in | |
* the configuration page. Here is a code snippet that makes the content | |
* language (which by default inherits the interface language's values) | |
* configurable: | |
* @code | |
* function mymodule_language_types_info_alter(&$language_types) { | |
* unset($language_types[LanguageInterface::TYPE_CONTENT]['fixed']); | |
* } | |
* @endcode | |
* | |
* The locked configuration property prevents one language type from being | |
* switched from customized to not customized, and vice versa. | |
* @see \Drupal\language\LanguageNegotiator::updateConfiguration() | |
* | |
* Every language type can have a different set of language negotiation methods | |
* assigned to it. Different language types often share the same language | |
* negotiation settings, but they can have independent settings if needed. If | |
* two language types are configured the same way, their language switcher | |
* configuration will be functionally identical and the same settings will act | |
* on both language types. | |
* | |
* Drupal defines the following built-in language negotiation methods: | |
* - URL: Determine the language from the URL (path prefix or domain). | |
* - Session: Determine the language from a request/session parameter. | |
* - User: Follow the user's language preference. | |
* - User admin language: Identify admin language from the user preferences. | |
* - Browser: Determine the language from the browser's language settings. | |
* - Selected language: Use the default site language. | |
* Language negotiation methods are simple plugin classes that implement a | |
* particular logic to return a language code. For instance, the URL method | |
* searches for a valid path prefix or domain name in the current request URL. | |
* If a language negotiation method does not return a valid language code, the | |
* next method associated with the language type (based on method weight) is | |
* invoked. | |
* | |
* Modules can define additional language negotiation methods by simply provide | |
* the related plugins, and alter existing methods through | |
* hook_language_negotiation_info_alter(). Here is an example snippet that lets | |
* path prefixes be ignored for administrative paths: | |
* @code | |
* function mymodule_language_negotiation_info_alter(&$negotiation_info) { | |
* // Replace the original plugin with our own implementation. | |
* $method_id = \Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUrl::METHOD_ID; | |
* $negotiation_info[$method_id]['class'] = 'Drupal\my_module\Plugin\LanguageNegotiation\MyLanguageNegotiationUrl'; | |
* } | |
* | |
* class MyLanguageNegotiationUrl extends LanguageNegotiationUrl { | |
* public function getCurrentLanguage(Request $request = NULL) { | |
* if ($request) { | |
* // Use the original URL language negotiation method to get a valid | |
* // language code. | |
* $langcode = parent::getCurrentLanguage($request); | |
* | |
* // If we are on an administrative path, override with the default | |
* language. | |
* if ($request->query->has('q') && strtok($request->query->get('q'), '/') == 'admin') { | |
* return $this->languageManager->getDefaultLanguage()->getId(); | |
* } | |
* return $langcode; | |
* } | |
* } | |
* } | |
* ?> | |
* @endcode | |
* | |
* For more information, see | |
* @link https://www.drupal.org/node/1497272 Language Negotiation API @endlink | |
*/ | |
interface LanguageNegotiatorInterface { | |
/** | |
* The language negotiation method id for the language negotiator itself. | |
*/ | |
const METHOD_ID = 'language-default'; | |
/** | |
* Resets the negotiated languages and the method instances. | |
*/ | |
public function reset(); | |
/** | |
* Sets the current active user and resets all language types. | |
* | |
* @param \Drupal\Core\Session\AccountInterface $current_user | |
* The current active user. | |
*/ | |
public function setCurrentUser(AccountInterface $current_user); | |
/** | |
* Initializes the specified language type. | |
* | |
* @param string $type | |
* The language type to be initialized. | |
* | |
* @return \Drupal\Core\Language\LanguageInterface[] | |
* Returns an array containing a single language keyed by the language | |
* negotiation method ID used to determine the language of the specified | |
* type. If negotiation is not possible the default language is returned. | |
*/ | |
public function initializeType($type); | |
/** | |
* Returns the language negotiation methods enabled for a language type. | |
* | |
* @param string $type | |
* (optional) The language type. If no type is specified all the method | |
* definitions are returned. | |
* | |
* @return array[] | |
* An array of language negotiation method definitions keyed by method id. | |
*/ | |
public function getNegotiationMethods($type = NULL); | |
/** | |
* Returns an instance of the specified language negotiation method. | |
* | |
* @param string $method_id | |
* The method identifier. | |
* | |
* @return \Drupal\language\LanguageNegotiationMethodInterface | |
*/ | |
public function getNegotiationMethodInstance($method_id); | |
/** | |
* Returns the ID of the language type's primary language negotiation method. | |
* | |
* @param string $type | |
* The language type. | |
* | |
* @return string | |
* The identifier of the primary language negotiation method for the given | |
* language type, or the default method if none exists. | |
*/ | |
public function getPrimaryNegotiationMethod($type); | |
/** | |
* Checks whether a language negotiation method is enabled for a language type. | |
* | |
* @param string $method_id | |
* The language negotiation method ID. | |
* @param string $type | |
* (optional) The language type. If none is passed, all the configurable | |
* language types will be inspected. | |
* | |
* @return bool | |
* TRUE if the method is enabled for at least one of the given language | |
* types, or FALSE otherwise. | |
*/ | |
public function isNegotiationMethodEnabled($method_id, $type = NULL); | |
/** | |
* Saves a list of language negotiation methods for a language type. | |
* | |
* @param string $type | |
* The language type. | |
* @param int[] $enabled_methods | |
* An array of language negotiation method weights keyed by method ID. | |
*/ | |
function saveConfiguration($type, $enabled_methods); | |
/** | |
* Resave the configuration to purge missing negotiation methods. | |
*/ | |
function purgeConfiguration(); | |
/** | |
* Updates the configuration based on the given language types. | |
* | |
* Stores the list of the language types along with information about their | |
* configurable state. Stores the default settings if the language type is | |
* not configurable. | |
* | |
* @param string[] $types | |
* An array of configurable language types. | |
*/ | |
function updateConfiguration(array $types); | |
} |