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<?php
/**
* @file
* Language Negotiation API.
*
* @see http://drupal.org/node/1497272
*/
/**
* No language negotiation. The default language is used.
*/
define('LANGUAGE_NEGOTIATION_DEFAULT', 'language-default');
/**
* @defgroup language_negotiation Language Negotiation API functionality
* @{
* Functions to customize the language types and the negotiation process.
*
* 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 providers: functions for determining which language to
* use to present a particular piece of data to the user.
* Both language types and language negotiation providers 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 (see
* @link field_language Field Language API @endlink for details).
* - URL language: The language associated with URLs. When generating a URL,
* this value will be used by url() 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
* providers 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[LANGUAGE_TYPE_CONTENT]['fixed']);
* }
* @endcode
*
* Every language type can have a different set of language negotiation
* providers 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 providers:
* - 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.
* - Browser: Determine the language from the browser's language settings.
* - Default language: Use the default site language.
* Language negotiation providers are simple callback functions that implement a
* particular logic to return a language code. For instance, the URL provider
* searches for a valid path prefix or domain name in the current request URL.
* If a language negotiation provider does not return a valid language code, the
* next provider associated to the language type (based on provider weight) is
* invoked.
*
* Modules can define additional language negotiation providers through
* hook_language_negotiation_info(), and alter existing providers 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 core function with our own function.
* module_load_include('language', 'inc', 'language.negotiation');
* $negotiation_info[LANGUAGE_NEGOTIATION_URL]['callbacks']['language'] = 'mymodule_from_url';
* $negotiation_info[LANGUAGE_NEGOTIATION_URL]['file'] = drupal_get_path('module', 'mymodule') . '/mymodule.module';
* }
*
* function mymodule_from_url($languages) {
* // Use the core URL language negotiation provider to get a valid language
* // code.
* module_load_include('language', 'inc', 'language.negotiation');
* $langcode = language_from_url($languages);
*
* // If we are on an administrative path, override with the default language.
* if (isset($_GET['q']) && strtok($_GET['q'], '/') == 'admin') {
* return language_default()->langcode;
* }
* return $langcode;
* }
* @endcode
*
* For more information, see
* @link http://drupal.org/node/1497272 Language Negotiation API @endlink
*/
/**
* Returns all the defined language types.
*
* @return
* An array of language type names. The name will be used as the global
* variable name the language value will be stored in.
*/
function language_types_info() {
$language_types = &drupal_static(__FUNCTION__);
if (!isset($language_types)) {
$language_types = module_invoke_all('language_types_info');
// Let other modules alter the list of language types.
drupal_alter('language_types_info', $language_types);
}
return $language_types;
}
/**
* Returns only the configurable language types.
*
* A language type maybe configurable or fixed. A fixed language type is a type
* whose language negotiation providers are module-defined and not altered
* through the user interface.
*
* @param $stored
* Optional. By default retrieves values from the 'language_types' variable to
* avoid unnecessary hook invocations.
* If set to FALSE retrieves values from the actual language type definitions.
* This allows to react to alterations performed on the definitions by modules
* installed after the 'language_types' variable is set.
*
* @return
* An array of language type names.
*/
function language_types_configurable($stored = TRUE) {
$configurable = &drupal_static(__FUNCTION__);
if ($stored && !isset($configurable)) {
$types = variable_get('language_types', drupal_language_types());
$configurable = array_keys(array_filter($types));
}
if (!$stored) {
$result = array();
foreach (language_types_info() as $type => $info) {
if (!isset($info['fixed'])) {
$result[] = $type;
}
}
return $result;
}
return $configurable;
}
/**
* Disables the given language types.
*
* @param $types
* An array of language types.
*/
function language_types_disable($types) {
$enabled_types = variable_get('language_types', drupal_language_types());
foreach ($types as $type) {
unset($enabled_types[$type]);
}
variable_set('language_types', $enabled_types);
}
/**
* Updates the language type configuration.
*/
function language_types_set() {
// Ensure that we are getting the defined language negotiation information. An
// invocation of module_enable() or module_disable() could outdate the cached
// information.
drupal_static_reset('language_types_info');
drupal_static_reset('language_negotiation_info');
// Determine which language types are configurable and which not by checking
// whether the 'fixed' key is defined. Non-configurable (fixed) language types
// have their language negotiation settings stored there.
$defined_providers = language_negotiation_info();
foreach (language_types_info() as $type => $info) {
if (isset($info['fixed'])) {
$language_types[$type] = FALSE;
$negotiation = array();
foreach ($info['fixed'] as $weight => $id) {
if (isset($defined_providers[$id])) {
$negotiation[$id] = $weight;
}
}
language_negotiation_set($type, $negotiation);
}
else {
$language_types[$type] = TRUE;
}
}
// Save language types.
variable_set('language_types', $language_types);
// Ensure that subsequent calls of language_types_configurable() return the
// updated language type information.
drupal_static_reset('language_types_configurable');
}
/**
* Checks whether a language negotiation provider is enabled for a language type.
*
* This has two possible behaviors:
* - If $provider_id is given return its ID if enabled, FALSE otherwise.
* - If no ID is passed the first enabled language negotiation provider is
* returned.
*
* @param $type
* The language negotiation provider type.
* @param $provider_id
* The language negotiation provider ID.
*
* @return
* The provider ID if it is enabled, FALSE otherwise.
*/
function language_negotiation_get($type, $provider_id = NULL) {
$negotiation = variable_get("language_negotiation_$type", array());
if (empty($negotiation)) {
return empty($provider_id) ? LANGUAGE_NEGOTIATION_DEFAULT : FALSE;
}
if (empty($provider_id)) {
return key($negotiation);
}
if (isset($negotiation[$provider_id])) {
return $provider_id;
}
return FALSE;
}
/**
* Checks if the language negotiation provider is enabled for any language type.
*
* @param $provider_id
* The language negotiation provider ID.
*
* @return
* TRUE if there is at least one language type for which the given language
* provider is enabled, FALSE otherwise.
*/
function language_negotiation_get_any($provider_id) {
foreach (language_types_configurable() as $type) {
if (language_negotiation_get($type, $provider_id)) {
return TRUE;
}
}
return FALSE;
}
/**
* Returns the language switch links for the given language.
*
* @param $type
* The language negotiation type.
* @param $path
* The internal path the switch links will be relative to.
*
* @return
* A keyed array of links ready to be themed.
*/
function language_negotiation_get_switch_links($type, $path) {
$links = FALSE;
$negotiation = variable_get("language_negotiation_$type", array());
// Only get the languages if we have more than one.
if (count(language_list()) >= 2) {
$language = language_initialize($type);
}
foreach ($negotiation as $id => $provider) {
if (isset($provider['callbacks']['switcher'])) {
if (isset($provider['file'])) {
require_once DRUPAL_ROOT . '/' . $provider['file'];
}
$callback = $provider['callbacks']['switcher'];
$result = $callback($type, $path);
// Add support for WCAG 2.0's Language of Parts to add language identifiers.
// http://www.w3.org/TR/UNDERSTANDING-WCAG20/meaning-other-lang-id.html
foreach ($result as $langcode => $link) {
$result[$langcode]['attributes']['xml:lang'] = $langcode;
}
if (!empty($result)) {
// Allow modules to provide translations for specific links.
drupal_alter('language_switch_links', $result, $type, $path);
$links = (object) array('links' => $result, 'provider' => $id);
break;
}
}
}
return $links;
}
/**
* Removes any unused language negotiation providers from the configuration.
*/
function language_negotiation_purge() {
// Ensure that we are getting the defined language negotiation information. An
// invocation of module_enable() or module_disable() could outdate the cached
// information.
drupal_static_reset('language_negotiation_info');
drupal_static_reset('language_types_info');
$defined_providers = language_negotiation_info();
foreach (language_types_info() as $type => $type_info) {
$weight = 0;
$negotiation = array();
foreach (variable_get("language_negotiation_$type", array()) as $id => $provider) {
if (isset($defined_providers[$id])) {
$negotiation[$id] = $weight++;
}
}
language_negotiation_set($type, $negotiation);
}
}
/**
* Saves a list of language negotiation providers.
*
* @param $type
* The language negotiation type.
* @param $language_providers
* An array of language negotiation provider weights keyed by provider ID.
* @see language_provider_weight()
*/
function language_negotiation_set($type, $language_providers) {
// Save only the necessary fields.
$provider_fields = array('callbacks', 'file', 'cache');
$negotiation = array();
$providers_weight = array();
$defined_providers = language_negotiation_info();
$default_types = language_types_configurable(FALSE);
// Initialize the providers weight list.
foreach ($language_providers as $id => $provider) {
$providers_weight[$id] = language_provider_weight($provider);
}
// Order providers list by weight.
asort($providers_weight);
foreach ($providers_weight as $id => $weight) {
if (isset($defined_providers[$id])) {
$provider = $defined_providers[$id];
// If the provider does not express any preference about types, make it
// available for any configurable type.
$types = array_flip(isset($provider['types']) ? $provider['types'] : $default_types);
// Check whether the provider is defined and has the right type.
if (isset($types[$type])) {
$provider_data = array();
foreach ($provider_fields as $field) {
if (isset($provider[$field])) {
$provider_data[$field] = $provider[$field];
}
}
$negotiation[$id] = $provider_data;
}
}
}
variable_set("language_negotiation_$type", $negotiation);
}
/**
* Returns all the defined language negotiation providers.
*
* @return
* An array of language negotiation providers.
*/
function language_negotiation_info() {
$language_providers = &drupal_static(__FUNCTION__);
if (!isset($language_providers)) {
// Collect all the module-defined language negotiation providers.
$language_providers = module_invoke_all('language_negotiation_info');
// Add the default language negotiation provider.
$language_providers[LANGUAGE_NEGOTIATION_DEFAULT] = array(
'callbacks' => array('language' => 'language_from_default'),
'weight' => 10,
'name' => t('Default'),
'description' => t('Use the default site language (@language_name).', array('@language_name' => language_default()->native)),
);
// Let other modules alter the list of language negotiation providers.
drupal_alter('language_negotiation_info', $language_providers);
}
return $language_providers;
}
/**
* Helper function used to cache the language negotiation providers results.
*
* @param $provider_id
* The language negotiation provider's identifier.
* @param $provider
* (optional) An associative array of information about the provider to be
* invoked (see hook_language_negotiation_info() for details). If not passed
* in, it will be loaded through language_negotiation_info().
*
* @return
* A language object representing the language chosen by the provider.
*/
function language_provider_invoke($provider_id, $provider = NULL) {
$results = &drupal_static(__FUNCTION__);
if (!isset($results[$provider_id])) {
global $user;
// Get languages grouped by status and select only the enabled ones.
$languages = language_list('enabled');
$languages = $languages[1];
if (!isset($provider)) {
$providers = language_negotiation_info();
$provider = $providers[$provider_id];
}
if (isset($provider['file'])) {
require_once DRUPAL_ROOT . '/' . $provider['file'];
}
// If the language negotiation provider has no cache preference or this is
// satisfied we can execute the callback.
$cache = !isset($provider['cache']) || $user->uid || $provider['cache'] == variable_get('cache', 0);
$callback = isset($provider['callbacks']['language']) ? $provider['callbacks']['language'] : FALSE;
$langcode = $cache && function_exists($callback) ? $callback($languages) : FALSE;
$results[$provider_id] = isset($languages[$langcode]) ? $languages[$langcode] : FALSE;
}
// Since objects are resources, we need to return a clone to prevent the
// language negotiation provider cache from being unintentionally altered. The
// same providers might be used with different language types based on
// configuration.
return !empty($results[$provider_id]) ? clone($results[$provider_id]) : $results[$provider_id];
}
/**
* Returns the passed language negotiation provider weight or a default value.
*
* @param $provider
* A language negotiation provider data structure.
*
* @return
* A numeric weight.
*/
function language_provider_weight($provider) {
$default = is_numeric($provider) ? $provider : 0;
return isset($provider['weight']) && is_numeric($provider['weight']) ? $provider['weight'] : $default;
}
/**
* Chooses a language based on language negotiation provider settings.
*
* @param $type
* The language type key to find the language for.
*
* @return
* The negotiated language object.
*/
function language_initialize($type) {
// Execute the language negotiation providers in the order they were set up and return the
// first valid language found.
$negotiation = variable_get("language_negotiation_$type", array());
foreach ($negotiation as $provider_id => $provider) {
$language = language_provider_invoke($provider_id, $provider);
if ($language) {
$language->provider = $provider_id;
return $language;
}
}
// If no other language was found use the default one.
$language = language_default();
$language->provider = LANGUAGE_NEGOTIATION_DEFAULT;
return $language;
}
/**
* Returns the default language negotiation provider.
*
* @return
* The default language code.
*/
function language_from_default() {
return language_default()->language;
}
/**
* Splits the given path into prefix and actual path.
*
* Parse the given path and return the language object identified by the prefix
* and the actual path.
*
* @param $path
* The path to split.
* @param $languages
* An array of valid languages.
*
* @return
* An array composed of:
* - A language object corresponding to the identified prefix on success,
* FALSE otherwise.
* - The path without the prefix on success, the given path otherwise.
*/
function language_url_split_prefix($path, $languages) {
$args = empty($path) ? array() : explode('/', $path);
$prefix = array_shift($args);
// Search prefix within enabled languages.
foreach ($languages as $language) {
if (!empty($language->prefix) && $language->prefix == $prefix) {
// Rebuild $path with the language removed.
return array($language, implode('/', $args));
}
}
return array(FALSE, $path);
}
/**
* Returns the possible fallback languages ordered by language weight.
*
* @param
* (optional) The language type. Defaults to LANGUAGE_TYPE_CONTENT.
*
* @return
* An array of language codes.
*/
function language_fallback_get_candidates($type = LANGUAGE_TYPE_CONTENT) {
$fallback_candidates = &drupal_static(__FUNCTION__);
if (!isset($fallback_candidates)) {
$fallback_candidates = array();
// Get languages ordered by weight.
// Use array keys to avoid duplicated entries.
foreach (language_list('weight') as $languages) {
foreach ($languages as $language) {
$fallback_candidates[$language->language] = NULL;
}
}
$fallback_candidates = array_keys($fallback_candidates);
$fallback_candidates[] = LANGUAGE_NONE;
// Let other modules hook in and add/change candidates.
drupal_alter('language_fallback_candidates', $fallback_candidates);
}
return $fallback_candidates;
}
/**
* @} End of "language_negotiation"
*/