From 79cbecae8373dea29839bdfbf1b71629736064d7 Mon Sep 17 00:00:00 2001
From: "This, that and the other" <at.light@live.com.au>
Date: Tue, 27 Dec 2016 20:51:50 +1100
Subject: [PATCH] Parser: Trim leading whitespace from links before checking
 for leading :

The leading spaces on the link only cause us problems, such as for the
$noforce check 20 lines later.

Bug: T129218
Change-Id: I93a8da1f73b38fa3da362f8f27479b3039ed3f13
---
 includes/parser/Parser.php   |  2 +-
 tests/parser/parserTests.txt | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/includes/parser/Parser.php b/includes/parser/Parser.php
index 702a479635..3ec059632e 100644
--- a/includes/parser/Parser.php
+++ b/includes/parser/Parser.php
@@ -2201,7 +2201,7 @@ class Parser {
 				continue;
 			}
 
-			$origLink = $m[1];
+			$origLink = ltrim( $m[1], ' ' );
 
 			# Don't allow internal links to pages containing
 			# PROTO: where PROTO is a valid URL protocol; these
diff --git a/tests/parser/parserTests.txt b/tests/parser/parserTests.txt
index 3853a12520..ed09203434 100644
--- a/tests/parser/parserTests.txt
+++ b/tests/parser/parserTests.txt
@@ -8590,6 +8590,22 @@ Blah blah blah
 <link rel="mw:PageProp/Language" href="http://es.wikipedia.org/wiki/Foo_bar" />
 !! end
 
+!! test
+Escaping of interlanguage links
+!! wikitext
+Blah blah blah
+[[:es:Spanish]]
+[[ : zh : Chinese ]]
+!! html/php
+<p>Blah blah blah
+<a href="http://es.wikipedia.org/wiki/Spanish" class="extiw" title="es:Spanish">es:Spanish</a>
+<a href="http://zh.wikipedia.org/wiki/Chinese" class="extiw" title="zh:Chinese"> zh : Chinese </a>
+</p>
+!! html/parsoid
+<p><a rel="mw:ExtLink" href="http://es.wikipedia.org/wiki/Spanish" title="es:Spanish">es:Spanish</a>
+<a rel="mw:ExtLink" href="http://zh.wikipedia.org/wiki/Chinese" title="zh:Chinese"> zh : Chinese </a></p>
+!! end
+
 ## parsoid html2wt will normalize the space to _
 !! test
 Space and question mark encoding in interlanguage links (T95473)
-- 
2.20.1