LanguageCode.php

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<?php
class LanguageCode {
    private static $deprecatedLanguageCodeMapping = [
        // Note that als is actually a valid ISO 639 code (Tosk Albanian), but it
        // was previously used in MediaWiki for Alsatian, which comes under gsw
        'als' => 'gsw',
        'bat-smg' => 'sgs',
        'be-x-old' => 'be-tarask',
        'fiu-vro' => 'vro',
        'roa-rup' => 'rup',
        'zh-classical' => 'lzh',
        'zh-min-nan' => 'nan',
        'zh-yue' => 'yue',
    ];
 
    public static function getDeprecatedCodeMapping() {
        return self::$deprecatedLanguageCodeMapping;
    }
 
    public static function replaceDeprecatedCodes( $code ) {
        if ( isset( self::$deprecatedLanguageCodeMapping[$code] ) ) {
            return self::$deprecatedLanguageCodeMapping[$code];
        }
        return $code;
    }
}