From 0f614669b674bd19ac44a1100535f208317331f7 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Bartosz=20Dziewo=C5=84ski?= <matma.rex@gmail.com>
Date: Sun, 17 Nov 2013 16:02:29 +0100
Subject: [PATCH] IcuCollation: Add CollationCkb subclass for Sorani Kurdish

ICU does not currently support Sorani Kurdish / Central Kurdish
language ('ckb'). CollationCkb uses the same collation rules as
Persian / Farsi ('fa'), but different characters for digits.

For use at ckb.wikipedia, which currently has 'uca-fa' collation
deployed as a workaround.

Added the MW language used for transforming digits to cache key for
first-letters data, in addition to the ICU locale.

Bug: 55630
Change-Id: I7d7f007592ede952859c5c9556b9ea5084b90e89
---
 includes/AutoLoader.php |  1 +
 includes/Collation.php  | 18 +++++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/includes/AutoLoader.php b/includes/AutoLoader.php
index ca40d1e461..58c8461368 100644
--- a/includes/AutoLoader.php
+++ b/includes/AutoLoader.php
@@ -50,6 +50,7 @@ $wgAutoloadLocalClasses = array(
 	'ChangeTags' => 'includes/ChangeTags.php',
 	'ChannelFeed' => 'includes/Feed.php',
 	'Collation' => 'includes/Collation.php',
+	'CollationCkb' => 'includes/Collation.php',
 	'ConcatenatedGzipHistoryBlob' => 'includes/HistoryBlob.php',
 	'Cookie' => 'includes/Cookie.php',
 	'CookieJar' => 'includes/Cookie.php',
diff --git a/includes/Collation.php b/includes/Collation.php
index b0688f54e1..7204f3129d 100644
--- a/includes/Collation.php
+++ b/includes/Collation.php
@@ -47,6 +47,8 @@ abstract class Collation {
 				return new IdentityCollation;
 			case 'uca-default':
 				return new IcuCollation( 'root' );
+			case 'xx-uca-ckb':
+				return new CollationCkb;
 			default:
 				$match = array();
 				if ( preg_match( '/^uca-([a-z@=-]+)$/', $collationName, $match ) ) {
@@ -350,7 +352,7 @@ class IcuCollation extends Collation {
 		}
 
 		$cache = wfGetCache( CACHE_ANYTHING );
-		$cacheKey = wfMemcKey( 'first-letters', $this->locale );
+		$cacheKey = wfMemcKey( 'first-letters', $this->locale, $this->digitTransformLanguage->getCode() );
 		$cacheEntry = $cache->get( $cacheKey );
 
 		if ( $cacheEntry && isset( $cacheEntry['version'] )
@@ -615,3 +617,17 @@ class IcuCollation extends Collation {
 		}
 	}
 }
+
+/**
+ * Workaround for the lack of support of Sorani Kurdish / Central Kurdish language ('ckb') in ICU.
+ *
+ * Uses the same collation rules as Persian / Farsi ('fa'), but different characters for digits.
+ */
+class CollationCkb extends IcuCollation {
+	function __construct() {
+		// This will set $locale and collators, which affect the actual sorting order
+		parent::__construct( 'fa' );
+		// Override the 'fa' language set by parent constructor, which affects #getFirstLetterData()
+		$this->digitTransformLanguage = Language::factory( 'ckb' );
+	}
+}
-- 
2.20.1