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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Translator; |
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use Psr\EventDispatcher\EventDispatcherInterface; |
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use RuntimeException; |
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use Yiisoft\I18n\Locale; |
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use Yiisoft\Translator\Event\MissingTranslationCategoryEvent; |
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use Yiisoft\Translator\Event\MissingTranslationEvent; |
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/** |
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* Translator translates a message into the specified language. |
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*/ |
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final class Translator implements TranslatorInterface |
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{ |
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private string $defaultCategory = 'app'; |
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/** |
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* @var CategorySource[][] Array of category message sources indexed by category names. |
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*/ |
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private array $categorySources = []; |
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/** |
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* @psalm-var array<string,true> |
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*/ |
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private array $dispatchedMissingTranslationCategoryEvents = []; |
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/** |
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* @param string $locale Default locale to use if locale is not specified explicitly. |
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* @param string|null $fallbackLocale Locale to use if message for the locale specified was not found. Null for none. |
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* @param EventDispatcherInterface|null $eventDispatcher Event dispatcher for translation events. Null for none. |
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*/ |
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public function __construct( |
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private string $locale = 'en_US', |
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private ?string $fallbackLocale = null, |
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private ?EventDispatcherInterface $eventDispatcher = null, |
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private MessageFormatterInterface $defaultMessageFormatter = new NullMessageFormatter() |
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) { |
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} |
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public function addCategorySource(CategorySource $category): void |
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{ |
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if (isset($this->categorySources[$category->getName()])) { |
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$this->categorySources[$category->getName()][] = $category; |
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} else { |
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$this->categorySources[$category->getName()] = [$category]; |
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} |
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} |
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public function addCategorySources(array $categories): void |
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{ |
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foreach ($categories as $category) { |
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$this->addCategorySource($category); |
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} |
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} |
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public function setLocale(string $locale): void |
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{ |
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$this->locale = $locale; |
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} |
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public function getLocale(): string |
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{ |
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return $this->locale; |
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} |
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public function translate( |
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string $id, |
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array $parameters = [], |
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string $category = null, |
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string $locale = null |
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): string { |
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$locale ??= $this->locale; |
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$category ??= $this->defaultCategory; |
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if (empty($this->categorySources[$category])) { |
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$this->dispatchMissingTranslationCategoryEvent($category); |
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return $this->defaultMessageFormatter->format($id, $parameters, $locale); |
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} |
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return $this->translateUsingCategorySources($id, $parameters, $category, $locale); |
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} |
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/** |
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* @psalm-immutable |
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*/ |
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public function withCategory(string $category): self |
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{ |
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if (!isset($this->categorySources[$category])) { |
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throw new RuntimeException('Category with name "' . $category . '" does not exist.'); |
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} |
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$new = clone $this; |
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$new->defaultCategory = $category; |
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return $new; |
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} |
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public function withLocale(string $locale): self |
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{ |
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$new = clone $this; |
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$new->setLocale($locale); |
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return $new; |
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} |
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private function translateUsingCategorySources( |
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string $id, |
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array $parameters, |
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string $category, |
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string $locale |
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): string { |
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$sourceCategory = end($this->categorySources[$category]); |
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do { |
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$message = $sourceCategory->getMessage($id, $locale, $parameters); |
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if ($message !== null) { |
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return $sourceCategory->format($message, $parameters, $locale); |
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} |
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if ($this->eventDispatcher !== null) { |
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$this->eventDispatcher->dispatch(new MissingTranslationEvent($sourceCategory->getName(), $locale, $id)); |
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} |
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} while (($sourceCategory = prev($this->categorySources[$category])) !== false); |
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$localeObject = new Locale($locale); |
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$fallback = $localeObject->fallbackLocale(); |
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if ($fallback->asString() !== $localeObject->asString()) { |
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return $this->translateUsingCategorySources($id, $parameters, $category, $fallback->asString()); |
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} |
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if (!empty($this->fallbackLocale)) { |
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$fallbackLocaleObject = (new Locale($this->fallbackLocale))->fallbackLocale(); |
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if ($fallbackLocaleObject->asString() !== $localeObject->asString()) { |
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return $this->translateUsingCategorySources($id, $parameters, $category, $fallbackLocaleObject->asString()); |
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} |
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} |
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$categorySource = end($this->categorySources[$category]); |
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return $categorySource->format($id, $parameters, $locale); |
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} |
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private function dispatchMissingTranslationCategoryEvent(string $category): void |
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{ |
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if ( |
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$this->eventDispatcher !== null |
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&& !isset($this->dispatchedMissingTranslationCategoryEvents[$category]) |
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) { |
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$this->dispatchedMissingTranslationCategoryEvents[$category] = true; |
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$this->eventDispatcher->dispatch(new MissingTranslationCategoryEvent($category)); |
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} |
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} |
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} |
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yiisoft /
translator
