From 76478abafeed68698524281d6e9aee02ece9533d Mon Sep 17 00:00:00 2001
From: Alexandre Emsenhuber <ialex@users.mediawiki.org>
Date: Sun, 14 Aug 2011 20:22:52 +0000
Subject: [PATCH] Added Parser::recursivePreprocess(); like preprocess() but
 doesn't call startParse() so that it can be used inside a parse operation
 using the same context without having to mess with other functions

Simple use case (PHP 5.3+) that will work show the expand text passed to a <preprocess> tag:
$wgHooks['ParserFirstCallInit'][] = function( $parser ) {
	$parser->setHook( 'preprocess', function( $text, $attr, $parser, $frame ) {
		return $parser->recursivePreprocess( $text, $frame );
	} );
	return true;
};
---
 includes/parser/Parser.php | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/includes/parser/Parser.php b/includes/parser/Parser.php
index 63891702ca..8fe153c31d 100644
--- a/includes/parser/Parser.php
+++ b/includes/parser/Parser.php
@@ -510,6 +510,22 @@ class Parser {
 		return $text;
 	}
 
+	/**
+	 * Recursive parser entry point that can be called from an extension tag
+	 * hook.
+	 *
+	 * @param $text String: text to be expanded
+	 * @param $frame PPFrame: The frame to use for expanding any template variables
+	 * @return String
+	 */
+	public function recursivePreprocess( $text, $frame = false ) {
+		wfProfileIn( __METHOD__ );
+		$text = $this->replaceVariables( $text, $frame );
+		$text = $this->mStripState->unstripBoth( $text );
+		wfProfileOut( __METHOD__ );
+		return $text;
+	}
+
 	/**
 	 * Process the wikitext for the ?preload= feature. (bug 5210)
 	 *
-- 
2.20.1