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<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\i18n; |
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use Yii; |
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use yii\base\Component; |
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/** |
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* MessageSource is the base class for message translation repository classes. |
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* |
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* A message source stores message translations in some persistent storage. |
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* |
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* Child classes should override [[loadMessages()]] to provide translated messages. |
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* |
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* @author Qiang Xue <[email protected]> |
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* @since 2.0 |
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*/ |
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class MessageSource extends Component |
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{ |
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/** |
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* @event MissingTranslationEvent an event that is triggered when a message translation is not found. |
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*/ |
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const EVENT_MISSING_TRANSLATION = 'missingTranslation'; |
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/** |
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* @var bool whether to force message translation when the source and target languages are the same. |
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* Defaults to false, meaning translation is only performed when source and target languages are different. |
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*/ |
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public $forceTranslation = false; |
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/** |
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* @var string the language that the original messages are in. If not set, it will use the value of |
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* [[\yii\base\Application::sourceLanguage]]. |
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*/ |
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public $sourceLanguage; |
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private $_messages = []; |
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/** |
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* Initializes this component. |
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*/ |
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public function init() |
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{ |
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parent::init(); |
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if ($this->sourceLanguage === null) { |
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$this->sourceLanguage = Yii::$app->sourceLanguage; |
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} |
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} |
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/** |
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* Loads the message translation for the specified language and category. |
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* If translation for specific locale code such as `en-US` isn't found it |
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* tries more generic `en`. |
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* |
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* @param string $category the message category |
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* @param string $language the target language |
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* @return array the loaded messages. The keys are original messages, and the values |
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* are translated messages. |
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*/ |
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protected function loadMessages($category, $language) |
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{ |
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return []; |
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} |
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/** |
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* Translates a message to the specified language. |
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* |
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* Note that unless [[forceTranslation]] is true, if the target language |
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* is the same as the [[sourceLanguage|source language]], the message |
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* will NOT be translated. |
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* |
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* If a translation is not found, a [[EVENT_MISSING_TRANSLATION|missingTranslation]] event will be triggered. |
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* |
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* @param string $category the message category |
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* @param string $message the message to be translated |
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* @param string $language the target language |
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* @return string|bool the translated message or false if translation wasn't found or isn't required |
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*/ |
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public function translate($category, $message, $language) |
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{ |
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if ($this->forceTranslation || $language !== $this->sourceLanguage) { |
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return $this->translateMessage($category, $message, $language); |
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} |
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return false; |
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} |
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/** |
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* Translates the specified message. |
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* If the message is not found, a [[EVENT_MISSING_TRANSLATION|missingTranslation]] event will be triggered. |
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* If there is an event handler, it may provide a [[MissingTranslationEvent::$translatedMessage|fallback translation]]. |
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* If no fallback translation is provided this method will return `false`. |
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* @param string $category the category that the message belongs to. |
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* @param string $message the message to be translated. |
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* @param string $language the target language. |
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* @return string|bool the translated message or false if translation wasn't found. |
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*/ |
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protected function translateMessage($category, $message, $language) |
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{ |
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$key = $language . '/' . $category; |
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if (!isset($this->_messages[$key])) { |
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$this->_messages[$key] = $this->loadMessages($category, $language); |
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} |
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if (isset($this->_messages[$key][$message]) && $this->_messages[$key][$message] !== '') { |
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return $this->_messages[$key][$message]; |
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} |
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if ($this->hasEventHandlers(self::EVENT_MISSING_TRANSLATION)) { |
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$event = new MissingTranslationEvent([ |
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'name' => self::EVENT_MISSING_TRANSLATION, |
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'category' => $category, |
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'message' => $message, |
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'language' => $language, |
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]); |
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$this->trigger($event); |
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if ($event->translatedMessage !== null) { |
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return $this->_messages[$key][$message] = $event->translatedMessage; |
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} |
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} |
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return $this->_messages[$key][$message] = false; |
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} |
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} |
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yiisoft /
yii2
