CiteCSSFileModule.php

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<?php
 
class CiteCSSFileModule extends ResourceLoaderFileModule {
 
    public function __construct(
        $options = [],
        $localBasePath = null,
        $remoteBasePath = null
    ) {
        global $wgContLang;
 
        parent::__construct( $options, $localBasePath, $remoteBasePath );
 
        // Get the content language code, and all the fallbacks. The first that
        // has a ext.cite.style.<lang code>.css file present will be used.
        $langCodes = array_merge( [ $wgContLang->getCode() ],
            $wgContLang->getFallbackLanguages() );
        foreach ( $langCodes as $lang ) {
            $langStyleFile = 'ext.cite.style.' . $lang . '.css';
            $localPath = $this->getLocalPath( $langStyleFile );
            if ( file_exists( $localPath ) ) {
                $this->styles[] = $langStyleFile;
                break;
            }
        }
    }
 
}