Adding = as a parser function

Bug: T91154
Change-Id: I8c9df0a8ce07e1febef137946615efd74d4800e3

RELEASE-NOTES-1.35

@@ -191,6 +191,10 @@ For notes on 1.34.x and older releases, see HISTORY.
   $wgInterwikiMagic=false
 * The form at ?action=watch has a new dropdown list to support expiry dates for
   watchlist items (if $wgWatchlistExpiry is true).
+* `{{=}}` is now a wikitext built-in template, expanding to `=`.  This
+  is conventially used as an escape mechanism to allow the use of `=` in
+  unnamed template arguments, although there are workarounds using named
+  arguments.
 * …
 
 === New developer features in 1.35 ===

includes/MagicWordFactory.php

@@ -43,6 +43,7 @@ class MagicWordFactory {
 	/** @var string[] */
 	private $mVariableIDs = [
 		'!',
+		'=',
 		'currentmonth',
 		'currentmonth1',
 		'currentmonthname',

includes/parser/CoreMagicVariables.php

@@ -61,6 +61,8 @@ class CoreMagicVariables {
 		switch ( $id ) {
 			case '!':
 				return '|';
+			case '=':
+				return '=';
 			case 'currentmonth':
 				return $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'm' ), true );
 			case 'currentmonth1':

languages/messages/MessagesEn.php

@@ -221,6 +221,7 @@ $magicWords = [
 	'toc'                     => [ 0, '__TOC__' ],
 	'noeditsection'           => [ 0, '__NOEDITSECTION__' ],
 	'!'                       => [ 1, '!' ],
+	'='                       => [ 1, '=' ],
 	'currentmonth'            => [ 1, 'CURRENTMONTH', 'CURRENTMONTH2' ],
 	'currentmonth1'           => [ 1, 'CURRENTMONTH1' ],
 	'currentmonthname'        => [ 1, 'CURRENTMONTHNAME' ],

tests/parser/parserTests.txt

@@ -86,12 +86,6 @@ Template:pipe
 |
 !! endarticle
 
-!! article
-Template:=
-!! text
-<nowiki>=</nowiki>
-!! endarticle
-
 !!article
 MediaWiki:bad image list
 !!text