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