From 5c753e7728897bdbfc5dd57c37f67bab7d7a6af2 Mon Sep 17 00:00:00 2001
From: Aryeh Gregor <simetrical@users.mediawiki.org>
Date: Fri, 18 Apr 2008 15:01:04 +0000
Subject: [PATCH] (bug 12698) Create PAGESIZE parser function, to return the
 size of a page.  Quite possibly this is getting out of hand; in that case,
 revert.  Patch based on one by CBM/carl-m.

---
 RELEASE-NOTES                     |  1 +
 includes/CoreParserFunctions.php  | 38 +++++++++++++++++++++++++++++++
 languages/messages/MessagesEn.php |  1 +
 3 files changed, 40 insertions(+)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 65cf8fa456..d86171ed92 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -82,6 +82,7 @@ it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
 * Allow \C and \Q as TeX commands to match \R, \N, \Z
 * On Special:UserRights, when you can add a group you can't remove or remove
   one you can't add, a notice is printed to warn you
+* (bug 12698) Create PAGESIZE parser function, to return the size of a page
 
 === Bug fixes in 1.13 ===
 
diff --git a/includes/CoreParserFunctions.php b/includes/CoreParserFunctions.php
index 7cd083e031..3f6f437496 100644
--- a/includes/CoreParserFunctions.php
+++ b/includes/CoreParserFunctions.php
@@ -42,6 +42,7 @@ class CoreParserFunctions {
 		$parser->setFunctionHook( 'defaultsort',      array( __CLASS__, 'defaultsort'      ), SFH_NO_HASH );
 		$parser->setFunctionHook( 'filepath',         array( __CLASS__, 'filepath'         ), SFH_NO_HASH );
 		$parser->setFunctionHook( 'pagesincategory',  array( __CLASS__, 'pagesincategory'  ), SFH_NO_HASH );
+		$parser->setFunctionHook( 'pagesize',         array( __CLASS__, 'pagesize'         ), SFH_NO_HASH );
 		$parser->setFunctionHook( 'tag',              array( __CLASS__, 'tagObj'           ), SFH_OBJECT_ARGS );
 
 		if ( $wgAllowDisplayTitle ) {
@@ -241,6 +242,43 @@ class CoreParserFunctions {
 		return self::formatRaw( $count, $raw );
 	}
 
+	/**
+	 * Return the size of the given page, or 0 if it's nonexistent.  This is an
+	 * expensive parser function and can't be called too many times per page.
+	 *
+	 * @FIXME This doesn't work correctly on preview for getting the size of
+	 *   the current page.
+	 * @FIXME Title::getLength() documentation claims that it adds things to
+	 *   the link cache, so the local cache here should be unnecessary, but in
+	 *   fact calling getLength() repeatedly for the same $page does seem to
+	 *   run one query for each call?
+	 */
+	static function pagesize( $parser, $page = '', $raw = null ) {
+		static $cache = array();
+		$title = Title::newFromText($page);
+
+		if( !is_object( $title ) ) {
+			$cache[$page] = 0;
+			return self::formatRaw( 0, $raw );
+		}
+
+		# Normalize name for cache
+		$page = $title->getPrefixedText();
+
+		$length = 0;
+		if( isset( $cache[$page] ) ) {
+			$length = $cache[$page];
+		} elseif( $parser->incrementExpensiveFunctionCount() ) {
+			$length = $cache[$page] = $title->getLength();
+	
+			// Register dependency in templatelinks
+			$id = $title->getArticleId();
+			$revid = Revision::newFromTitle($title);
+			$parser->mOutput->addTemplate($title, $id, $revid);
+		}	
+		return self::formatRaw( $length, $raw );
+	}
+
 	static function language( $parser, $arg = '' ) {
 		global $wgContLang;
 		$lang = $wgContLang->getLanguageName( strtolower( $arg ) );
diff --git a/languages/messages/MessagesEn.php b/languages/messages/MessagesEn.php
index 5cefa6d87c..c23ab4431b 100644
--- a/languages/messages/MessagesEn.php
+++ b/languages/messages/MessagesEn.php
@@ -339,6 +339,7 @@ $magicWords = array(
 	'tag'                    => array( 0,    'tag'                    ),
 	'hiddencat'              => array( 1,    '__HIDDENCAT__'          ),
 	'pagesincategory'        => array( 1,    'PAGESINCATEGORY', 'PAGESINCAT' ),
+	'pagesize'               => array( 1,    'PAGESIZE'               ),
 );
 
 /**
-- 
2.20.1