From 04ce4a02c7149cf0c6148e49744fa0a0c9c09c33 Mon Sep 17 00:00:00 2001
From: "physikerwelt (Moritz Schubotz)" <wiki@physikerwelt.de>
Date: Tue, 10 Jun 2014 13:18:26 +0200
Subject: [PATCH] Add options to the math tag

* id: Allows to name equations
  and deep link to equations
* forcemathmode: Allows to override the user defined rendering mode.
  This feature is useful for help pages and discussions about rendering.
* type: support for MathML and asciimath input
  required for MediaWiki instances that want to
  incorporate MathML sources like for instance pubmed

Change-Id: I615c7f1a5762e9e662937b70953fb873309d4c07
---
 Math.php         |  3 +++
 MathRenderer.php | 16 +++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/Math.php b/Math.php
index b97f6a79b..cb1633aba 100644
--- a/Math.php
+++ b/Math.php
@@ -191,6 +191,9 @@ $wgMathDisableTexFilter = false;
 
 /** Stores debug information in the database and provides more detailed debug output */
 $wgMathDebug = false;
+
+/** @var boolean $wgMathEnableExperimentalInputFormats enables experimental MathML and AsciiMath input format support */
+$wgMathEnableExperimentalInputFormats = false;
 ////////// end of config settings.
 
 $wgExtensionFunctions[] = 'MathHooks::setup';
diff --git a/MathRenderer.php b/MathRenderer.php
index dd64ad4ed..d25e0c9ce 100644
--- a/MathRenderer.php
+++ b/MathRenderer.php
@@ -117,7 +117,7 @@ abstract class MathRenderer {
 	 * @return MathRenderer appropriate renderer for mode
 	 */
 	public static function getRenderer( $tex, $params = array(),  $mode = MW_MATH_PNG ) {
-		global $wgDefaultUserOptions, $wgMathValidModes;
+		global $wgDefaultUserOptions, $wgMathValidModes, $wgMathEnableExperimentalInputFormats;
 		$mathStyle = null;
 		if ( isset( $params['display'] ) ) {
 			$layoutMode = $params['display'];
@@ -139,9 +139,23 @@ abstract class MathRenderer {
 				$tex = '{\textstyle ' . $tex . '}';
 			}
 		}
+		$id = null;
+		if ( isset( $params['id'] ) ) {
+			$id = $params['id'];
+		}
+		if ( isset( $params['forcemathmode'] ) ) {
+			$mode = $params['forcemathmode'];
+		}
 		if ( !in_array( $mode, $wgMathValidModes ) ) {
 			$mode = $wgDefaultUserOptions['math'];
 		}
+		if ( $wgMathEnableExperimentalInputFormats === true && $mode == MW_MATH_MATHML &&  isset( $params['type'] ) ) {
+			// Support of MathML input (experimental)
+			// Currently support for mode MW_MATH_MATHML only
+			if( !in_array( $params['type'], array( 'pmml', 'ascii' ) ) ) {
+				unset( $params['type'] );
+			}
+		}
 		switch ( $mode ) {
 			case MW_MATH_MATHJAX:
 			case MW_MATH_SOURCE: