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[lhc/web/wiklou.git] / includes / Collation.php

diff --git a/includes/Collation.php b/includes/Collation.php
index 4cd921d..0c510b7 100644 (file)
--- a/includes/Collation.php
+++ b/includes/Collation.php
@@ -23,9 +23,21 @@ abstract class Collation {
                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\"" );
                }
        }
@@ -89,6 +101,30 @@ class UppercaseCollation extends Collation {
        }
 }
 
+/**
+ * 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;