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<?php
/**
* @file
* Internationalization (i18n) integration.
*/
/**
* Gets the i18n controller for a given entity type.
*
* @return EntityDefaultI18nStringController|array|false
* If a type is given, the controller for the given entity type. Else an array
* of all enabled controllers keyed by entity type is returned.
*/
function entity_i18n_controller($type = NULL) {
$static = &drupal_static(__FUNCTION__);
if (!isset($type)) {
// Invoke the function for each type to ensure we have fully populated the
// static variable.
foreach (entity_get_info() as $entity_type => $info) {
entity_i18n_controller($entity_type);
}
return array_filter($static);
}
if (!isset($static[$type])) {
$info = entity_get_info($type);
// Do not activate it by default. Modules have to explicitly enable it by
// specifying EntityDefaultI18nStringController or their customization.
$class = isset($info['i18n controller class']) ? $info['i18n controller class'] : FALSE;
$static[$type] = $class ? new $class($type, $info) : FALSE;
}
return $static[$type];
}
/**
* Implements hook_i18n_string_info().
*/
function entity_i18n_string_info() {
$groups = array();
foreach (entity_i18n_controller() as $entity_type => $controller) {
$groups += $controller->hook_string_info();
}
return $groups;
}
/**
* Implements hook_i18n_object_info().
*/
function entity_i18n_object_info() {
$info = array();
foreach (entity_i18n_controller() as $entity_type => $controller) {
$info += $controller->hook_object_info();
}
return $info;
}
/**
* Implements hook_i18n_string_objects().
*/
function entity_i18n_string_objects($type) {
if ($controller = entity_i18n_controller($type)) {
return $controller->hook_string_objects();
}
}
/**
* Default controller handling i18n integration.
*
* Implements i18n string translation for all non-field properties marked as
* 'translatable' and having the flag 'i18n string' set. This translation
* approach fits in particular for translating configuration, i.e. exportable
* entities.
*
* Requirements for the default controller:
* - The entity type providing module must be specified using the 'module' key
* in hook_entity_info().
* - An 'entity class' derived from the provided class 'Entity' must be used.
* - Properties must be declared as 'translatable' and the 'i18n string' flag
* must be set to TRUE using hook_entity_property_info().
* - i18n must be notified about changes manually by calling
* i18n_string_object_update(), i18n_string_object_remove() and
* i18n_string_update_context(). Ideally, this is done in a small integration
* module depending on the entity API and i18n_string. Look at the provided
* testing module "entity_test_i18n" for an example.
* - If the entity API admin UI is used, the "translate" tab will be
* automatically enabled and linked from the UI.
* - There are helpers for getting translated values which work regardless
* whether the i18n_string module is enabled, i.e. entity_i18n_string()
* and Entity::getTranslation().
*
* Current limitations:
* - Translatable property values cannot be updated via the metadata wrapper,
* however reading works fine. See Entity::getTranslation().
*/
class EntityDefaultI18nStringController {
protected $entityType, $entityInfo;
/**
* The i18n textgroup we are using.
*/
protected $textgroup;
public function __construct($type) {
$this->entityType = $type;
$this->entityInfo = entity_get_info($type);
// By default we go with the module name as textgroup.
$this->textgroup = $this->entityInfo['module'];
}
/**
* Implements hook_i18n_string_info() via entity_i18n_string_info().
*/
public function hook_string_info() {
$list = system_list('module_enabled');
$info = $list[$this->textgroup]->info;
$groups[$this->textgroup] = array(
'title' => $info['name'],
'description' => !empty($info['description']) ? $info['description'] : NULL,
'format' => FALSE,
'list' => TRUE,
);
return $groups;
}
/**
* Implements hook_i18n_object_info() via entity_i18n_object_info().
*
* Go with the same default values as the admin UI as far as possible.
*/
public function hook_object_info() {
$wildcard = $this->menuWildcard();
$id_key = !empty($this->entityInfo['entity keys']['name']) ? $this->entityInfo['entity keys']['name'] : $this->entityInfo['entity keys']['id'];
$info[$this->entityType] = array(
// Generic object title.
'title' => $this->entityInfo['label'],
// The object key field.
'key' => $id_key,
// Placeholders for automatic paths.
'placeholders' => array(
$wildcard => $id_key,
),
// Properties for string translation.
'string translation' => array(
// Text group that will handle this object's strings.
'textgroup' => $this->textgroup,
// Object type property for string translation.
'type' => $this->entityType,
// Translatable properties of these objects.
'properties' => $this->translatableProperties(),
),
);
// Integrate the translate tab into the admin-UI if enabled.
if ($base_path = $this->menuBasePath()) {
$info[$this->entityType] += array(
// To produce edit links automatically.
'edit path' => $base_path . '/manage/' . $wildcard,
// Auto-generate translate tab.
'translate tab' => $base_path . '/manage/' . $wildcard . '/translate',
);
$info[$this->entityType]['string translation'] += array(
// Path to translate strings to every language.
'translate path' => $base_path . '/manage/' . $wildcard . '/translate/%i18n_language',
);
}
return $info;
}
/**
* Defines the menu base path used by self::hook_object_info().
*/
protected function menuBasePath() {
return !empty($this->entityInfo['admin ui']['path']) ? $this->entityInfo['admin ui']['path'] : FALSE;
}
/**
* Defines the menu wildcard used by self::hook_object_info().
*/
protected function menuWildcard() {
return isset($this->entityInfo['admin ui']['menu wildcard']) ? $this->entityInfo['admin ui']['menu wildcard'] : '%entity_object';
}
/**
* Defines translatable properties used by self::hook_object_info().
*/
protected function translatableProperties() {
$list = array();
foreach (entity_get_all_property_info($this->entityType) as $name => $info) {
if (!empty($info['translatable']) && !empty($info['i18n string'])) {
$list[$name] = array(
'title' => $info['label'],
);
}
}
return $list;
}
/**
* Implements hook_i18n_string_objects() via entity_i18n_string_objects().
*/
public function hook_string_objects() {
return entity_load_multiple_by_name($this->entityType, FALSE);
}
}
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