From 63ceedb8d4ee8014a6097c6dd22aa2d6dfd88807 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@users.mediawiki.org>
Date: Tue, 31 May 2005 10:21:14 +0000
Subject: [PATCH] * Only build the HTML attribute whitelist tree once.

---
 RELEASE-NOTES          | 2 ++
 includes/Sanitizer.php | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index bbbb56aa7a..b9d3449aff 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -227,6 +227,8 @@ Various bugfixes, small features, and a few experimental things:
 * Remove linkscc table code, no longer used.
 * (bug 2271) Use faster text-only link replacement in image alt text
   instead of rerunning expensive link lookup and HTML generation.
+* Only build the HTML attribute whitelist tree once.
+
 
 === Caveats ===
 
diff --git a/includes/Sanitizer.php b/includes/Sanitizer.php
index 116a803611..449ca5c81a 100644
--- a/includes/Sanitizer.php
+++ b/includes/Sanitizer.php
@@ -663,7 +663,10 @@ class Sanitizer {
 	 * @return array
 	 */
 	function attributeWhitelist( $element ) {
-		$list = Sanitizer::setupAttributeWhitelist();
+		static $list;
+		if( !isset( $list ) ) {
+			$list = Sanitizer::setupAttributeWhitelist();
+		}
 		return isset( $list[$element] )
 			? $list[$element]
 			: array();
-- 
2.20.1