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<?php /** * Database row sorting. * * 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 * * @file */ /** * @since 1.16.3 * @author Tim Starling * @stable to extend */ abstract class Collation { /** * Given a string, convert it to a (hopefully short) key that can be used * for efficient sorting. A binary sort according to the sortkeys * corresponds to a logical sort of the corresponding strings. Current * code expects that a line feed character should sort before all others, but * has no other particular expectations (and that one can be changed if * necessary). * * @since 1.16.3 * * @param string $string UTF-8 string * @return string Binary sortkey */ abstract public function getSortKey( $string ); /** * Get multiple sort keys * * @param string[] $strings * @return string[] */ public function getSortKeys( $strings ) { $ret = []; foreach ( $strings as $key => $s ) { $ret[$key] = $this->getSortKey( $s ); } return $ret; } /** * Given a string, return the logical "first letter" to be used for * grouping on category pages and so on. This has to be coordinated * carefully with convertToSortkey(), or else the sorted list might jump * back and forth between the same "initial letters" or other pathological * behavior. For instance, if you just return the first character, but "a" * sorts the same as "A" based on getSortKey(), then you might get a * list like * * == A == * * [[Aardvark]] * * == a == * * [[antelope]] * * == A == * * [[Ape]] * * etc., assuming for the sake of argument that $wgCapitalLinks is false. * * @since 1.16.3 * * @param string $string UTF-8 string * @return string UTF-8 string corresponding to the first letter of input */ abstract public function getFirstLetter( $string ); }
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