<?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
+ */
abstract class Collation {
static $instance;
switch( $collationName ) {
case 'uppercase':
return new UppercaseCollation;
+ case 'identity':
+ return new IdentityCollation;
case 'uca-default':
return new IcuCollation( 'root' );
default:
+ # Provide a mechanism for extensions to hook in.
+
+ $collationObject = null;
+ wfRunHooks( 'Collation::factory', array( $collationName, &$collationObject ) );
+
+ if ( $collationObject instanceof Collation ) {
+ return $collationObject;
+ }
+
+ // If all else fails...
throw new MWException( __METHOD__.": unknown collation type \"$collationName\"" );
}
}
}
}
+/**
+ * Collation class that's essentially a no-op.
+ *
+ * Does sorting based on binary value of the string.
+ * Like how things were pre 1.17.
+ */
+class IdentityCollation extends Collation {
+
+ function getSortKey( $string ) {
+ return $string;
+ }
+
+ function getFirstLetter( $string ) {
+ global $wgContLang;
+ // Copied from UppercaseCollation.
+ // I'm kind of unclear on when this could happen...
+ if ( $string[0] == "\0" ) {
+ $string = substr( $string, 1 );
+ }
+ return $wgContLang->firstChar( $string );
+ }
+}
+
+
class IcuCollation extends Collation {
var $primaryCollator, $mainCollator, $locale;
var $firstLetterData;
* -1, 0 or 1 in the style of strcmp().
* @param $target string The target value to find.
*
- * @return The item index of the lower bound, or false if the target value
+ * @return int|bool The item index of the lower bound, or false if the target value
* sorts before all items.
*/
function findLowerBound( $valueCallback, $valueCount, $comparisonCallback, $target ) {