From fc9b3e1d920714281f623261c5265bf82d684117 Mon Sep 17 00:00:00 2001
From: gicode <gicode@localhost>
Date: Thu, 10 Nov 2011 18:02:38 +0000
Subject: [PATCH] Follow-up r102587.  Add details to comments and add a couple
 more tests.

---
 includes/GlobalFunctions.php                        | 13 +++++++------
 .../GlobalFunctions/wfRemoveDotSegmentsTest.php     |  3 +++
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/includes/GlobalFunctions.php b/includes/GlobalFunctions.php
index 339cd090c7..0913fa2391 100644
--- a/includes/GlobalFunctions.php
+++ b/includes/GlobalFunctions.php
@@ -503,22 +503,23 @@ function wfRemoveDotSegments( $urlPath ) {
 	while ( $urlPath ) {
 		$matches = null;
 		if ( preg_match('%^\.\.?/%', $urlPath, $matches) ) {
-			# Step A
+			# Step A, remove leading "../" or "./"
 			$urlPath = substr( $urlPath, strlen( $matches[0] ) );
 		} elseif ( preg_match( '%^/\.(/|$)%', $urlPath, $matches ) ) {
-			# Step B
+			# Step B, replace leading "/.$" or "/./" with "/"
 			$start = strlen( $matches[0] );
 			$urlPath = '/' . substr( $urlPath, $start );
 		} elseif ( preg_match( '%^/\.\.(/|$)%', $urlPath, $matches ) ) {
-			# Step C
+			# Step C, replace leading "/..$" or "/../" with "/" and
+			# remove last path component in output
 			$start = strlen( $matches[0] );
 			$urlPath = '/' . substr( $urlPath, $start );
 			$output = preg_replace('%(^|/)[^/]*$%', '', $output);
 		} elseif ( preg_match( '%^\.\.?$%', $urlPath, $matches ) ) {
-			# Step D
-			$urlPath = substr( $urlPath, strlen( $matches[0] ) );
+			# Step D, remove "^..$" or "^.$"
+			$urlPath = '';
 		} else {
-			# Step E
+			# Step E, move leading path segment to output
 			preg_match( '%^/?[^/]*%', $urlPath, $matches );
 			$urlPath = substr( $urlPath, strlen( $matches[0] ) );
 			$output .= $matches[0];
diff --git a/tests/phpunit/includes/GlobalFunctions/wfRemoveDotSegmentsTest.php b/tests/phpunit/includes/GlobalFunctions/wfRemoveDotSegmentsTest.php
index c60600535a..1cf0e0fb2c 100644
--- a/tests/phpunit/includes/GlobalFunctions/wfRemoveDotSegmentsTest.php
+++ b/tests/phpunit/includes/GlobalFunctions/wfRemoveDotSegmentsTest.php
@@ -23,11 +23,14 @@ class wfRemoveDotSegments extends MediaWikiTestCase {
 			array( '/a/b/c/./../../g', '/a/g' ),
 			array( 'mid/content=5/../6', 'mid/6' ),
 			array( '/a//../b', '/a/b' ),
+			array( '/.../a', '/.../a' ),
+			array( '.../a', '.../a' ),
 			array( '', '' ),
 			array( '/', '/' ),
 			array( '//', '//' ),
 			array( '.', '' ),
 			array( '..', '' ),
+			array( '...', '...' ),
 			array( '/.', '/' ),
 			array( '/..', '/' ),
 			array( './', '' ),
-- 
2.20.1