From e6a33f0c8145127c8ca2de471ab5bed980eaf51e Mon Sep 17 00:00:00 2001
From: Alex Z <mrzman@users.mediawiki.org>
Date: Fri, 10 Oct 2008 22:19:55 +0000
Subject: [PATCH] Adding file cache to the parser to improve rendering time on
 pages with several uses of the same image; designed with input from Brion and
 Tim. Cache size is limited to 1000.

---
 RELEASE-NOTES              |  2 ++
 includes/parser/Parser.php | 14 +++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 8fcba5c6e3..1907f1afb4 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -165,6 +165,8 @@ The following extensions are migrated into MediaWiki 1.14:
 * Added the ability to display user edit counts in Special:ListUsers. Off by 
   default, enabled with $wgEdititis = true (named after the medical condition 
   marked by unhealthy obsession with edit counts).
+* Added a file cache to the parser to improve page rendering time on pages with
+  several uses of the same image.
 
 === Bug fixes in 1.14 ===
 
diff --git a/includes/parser/Parser.php b/includes/parser/Parser.php
index 14c472f002..427e4ff630 100644
--- a/includes/parser/Parser.php
+++ b/includes/parser/Parser.php
@@ -103,6 +103,7 @@ class Parser
 	var $mTplExpandCache; // empty-frame expansion cache
 	var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 	var $mExpensiveFunctionCount; // number of expensive parser function calls
+	var $mFileCache;
 
 	# Temporary
 	# These are variables reset at least once per parse regardless of $clearState
@@ -229,6 +230,7 @@ class Parser
 		$this->mHeadings = array();
 		$this->mDoubleUnderscores = array();
 		$this->mExpensiveFunctionCount = 0;
+		$this->mFileCache = array();
 
 		# Fix cloning
 		if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
@@ -4292,8 +4294,18 @@ class Parser
 			return $sk->link( $title );
 		}
 
+		# Get the file
+		$imagename = $title->getDBkey();
+		if ( isset( $this->mFileCache[$imagename][$time] ) ) {
+			$file = $this->mFileCache[$imagename][$time];
+		} else {
+			$file = wfFindFile( $title, $time );
+			if ( !(count( $this->mFileCache ) <= 1000) ) {
+				$this->mFileCache = array();
+			}
+			$this->mFileCache[$imagename][$time] = $file;
+		}
 		# Get parameter map
-		$file = wfFindFile( $title, $time );
 		$handler = $file ? $file->getHandler() : false;
 
 		list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
-- 
2.20.1