DateFormatterConfig.php

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<?php
 
namespace MediaWiki\ResourceLoader;
 
use MediaWiki\Config\Config;
use MediaWiki\Language\Language;
use MediaWiki\Language\LanguageCode;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
 
class DateFormatterConfig extends Module {
    public static function getData( Context $context, Config $config ) {
        $lang = MediaWikiServices::getInstance()->getLanguageFactory()
            ->getLanguage( $context->getLanguage() );
        return self::getDataForLang( $lang, $config );
    }
 
    public static function getDataForLang( Language $lang, Config $config ) {
        $locales = [ $lang->getHtmlCode() ];
        $fallbacks = $lang->getFallbackLanguages();
        foreach ( $fallbacks as $code ) {
            $locales[] = LanguageCode::bcp47( $code );
        }
 
        // Discover which fields are required
        $formats = $lang->getJsDateFormats();
        $haveField = [];
        foreach ( $formats as $format ) {
            $pattern = $format['pattern'] ?? '';
            foreach ( [ 'mwMonth', 'mwMonthGen', 'mwMonthAbbrev' ] as $field ) {
                if ( str_contains( $pattern, "{$field}" ) ) {
                    $haveField[$field] = true;
                }
            }
        }
 
        // Include only the required month data
        if ( $haveField ) {
            $months = [ [] ];
            for ( $i = 1; $i <= 12; $i++ ) {
                $data = [
                    isset( $haveField['mwMonth'] ) ? $lang->getMonthName( $i ) : '',
                    isset( $haveField['mwMonthGen'] ) ? $lang->getMonthNameGen( $i ) : '',
                    isset( $haveField['mwMonthAbbrev'] ) ? $lang->getMonthAbbreviation( $i ) : ''
                ];
                // Trim the end of the array
                while ( end( $data ) === '' ) {
                    unset( $data[ array_key_last( $data ) ] );
                }
                $months[] = $data;
            }
        } else {
            $months = [];
        }
 
        return [
            'locales' => $locales,
            'formats' => $formats,
            'defaultStyle' => $lang->getDefaultDateFormat(),
            'localZone' => $config->get( MainConfigNames::Localtimezone ),
            'localOffset' => (int)$config->get( MainConfigNames::LocalTZoffset ),
            'months' => $months
        ];
    }
}