wikimedia/mediawiki-core

<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @since 1.16.3
 *
 * @file
 */

use MediaWiki\Languages\LanguageFactory;

class UppercaseCollation extends Collation {

    /** @var Language Language object for English, so we can use the generic
     * UTF-8 uppercase function there
     */
    private $lang;

    /**
     * @param LanguageFactory $languageFactory
     */
    public function __construct( LanguageFactory $languageFactory ) {
        $this->lang = $languageFactory->getLanguage( 'en' );
    }

    public function getSortKey( $string ) {
        return $this->lang->uc( $string );
    }

    public function getFirstLetter( $string ) {
        if ( $string[0] == "\0" ) {
            $string = substr( $string, 1 );
        }
        return $this->lang->ucfirst( $this->lang->firstChar( $string ) );
    }

}