MessageTranslator.php

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<?php
namespace Elgg\I18n;

class MessageTranslator implements TranslatorInterface {
    
    // TODO Maybe this should be an array of locales to provide multiple fallbacks?
    private $defaultLocale;
    
    private $messages;
    
    public function __construct(Locale $defaultLocale, MessageBundle $messages) {
        $this->defaultLocale = $defaultLocale;
        $this->messages = $messages;
    }
    
    public function translate($key, array $args = [], Locale $locale = null) {
        $locales = [
            $locale,
            $this->defaultLocale,
            Locale::parse('en'),
        ];
        
        foreach ($locales as $locale) {
            if (!$locale) {
                continue;
            }
            
            $message = $this->messages->get($key, $locale);
            
            if ($message) {
                return $message->format($args);
            }
        }
        
        return $key;
    }
}