New: "//site.com/x" style URL support in CPURL and CFURL.

With this feature, CFURL and CPURL can now correctly transform a relative scheme URL starting with a double-slash.

For example, + CPURL URLWithString:@"//a.se/a" relativeToURL:@"ftp://b.se/c" would represent an absolute URL of "ftp://a.se/a".

Objective-J/CFURL.js

@@ -277,9 +277,17 @@ function resolveURL(aURL)
         absoluteBaseURL = baseURL.absoluteURL(),
         baseParts = PARTS(absoluteBaseURL);
 
-    if (parts.scheme || parts.authority)
+    if (!parts.scheme && parts.authorityRoot)
+    {
+        // Handle "//domain.com/" style links which need to take their scheme from the base URL,
+        // but nothing else.
+        resolvedParts = CFURLPartsCreateCopy(parts);
+        resolvedParts.scheme = baseURL.scheme();
+    }
+    else if (parts.scheme || parts.authority)
+    {
         resolvedParts = parts;
-
+    }
     else
     {
         resolvedParts = { };
@@ -302,7 +310,6 @@ function resolveURL(aURL)
             resolvedParts.path = parts.path;
             resolvedParts.pathComponents = pathComponents;
         }
-
         else
         {
             var basePathComponents = baseParts.pathComponents,

Tests/Foundation/CPURLTest.j

@@ -103,6 +103,16 @@ var exampleProtocol = "http",
     [self assert:[url lastPathComponent] equals:examplePathRelative];
 }
 
+- (void)testUrlWithDoubleSlashRelativeToHttpUrl
+{
+    [self assert:"http://example2.com/b/a.html" equals:[[CPURL URLWithString:@"//example2.com/b/a.html" relativeToURL:[CPURL URLWithString:@"http://www.example.com/test/"]] absoluteString]];
+}
+
+- (void)testUrlWithDoubleSlashRelativeToHttpsUrl
+{
+    [self assert:"https://example2.com/b/a.html" equals:[[CPURL URLWithString:@"//example2.com/b/a.html" relativeToURL:[CPURL URLWithString:@"https://www.example.com/test/"]] absoluteString]];
+}
+
 - (void)testDeleteComponent
 {
     var url = [CPURL URLWithString:exampleFullPath];

Tests/Objective-J/CFURLTest.j

@@ -5,7 +5,7 @@
 
 - (void)testRelativeURLs
 {
-    var URLStrings = 
+    var URLStrings =
     {
         "g:h"           : "g:h",
         "g"             : "http://a/b/c/g",
@@ -89,4 +89,11 @@
             [self assert:new CFURL(URLString).absoluteString() equals:URLStrings[URLString]];
 }
 
+- (void)testDoubleSlash
+{
+    [self assert:"//a" equals:new CFURL("//a").absoluteString()];
+    [self assert:"ftp://a" equals:new CFURL("//a", new CFURL("ftp://example.com/b")).absoluteString()];
+    [self assert:"ftp://example.com/a" equals:new CFURL("/a", new CFURL("ftp://example.com/b")).absoluteString()];
+}
+
 @end