Locale.php

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<?php

namespace Elgg\I18n;

use Elgg\Exceptions\I18n\InvalidLocaleException;

final class Locale {
    
    private $locale;
    
    private function __construct($locale) {
        $this->locale = $locale;
    }
    
    public function __toString() {
        return $this->locale;
    }
    
    public static function parse($locale) {
        if (!preg_match('~^[a-z0-9_]{2,20}$~', $locale)) {
            throw new InvalidLocaleException("Unrecognized locale: $locale");
        }
        
        return new Locale($locale);
    }
}