[fix] Use 'null' as origin for non special URLs

Author: lpinca

index.js

@@ -371,7 +371,7 @@ function Url(address, location, parser) {
     url.password = instruction[1] || '';
   }
 
-  url.origin = url.protocol && url.host && url.protocol !== 'file:'
+  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
     ? url.protocol +'//'+ url.host
     : 'null';
 
@@ -464,7 +464,7 @@ function set(part, value, fn) {
     if (ins[4]) url[ins[1]] = url[ins[1]].toLowerCase();
   }
 
-  url.origin = url.protocol && url.host && url.protocol !== 'file:'
+  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
     ? url.protocol +'//'+ url.host
     : 'null';
 

test/test.js

@@ -395,6 +395,13 @@ describe('url-parse', function () {
       assume(parsed.origin).equals('null');
     });
 
+    it('is null for non special URLs', function () {
+      var o = parse('foo://example.com/pathname');
+      assume(o.hostname).equals('example.com');
+      assume(o.pathname).equals('/pathname');
+      assume(o.origin).equals('null');
+    });
+
     it('removes default ports for http', function () {
       var o = parse('http://google.com:80/pathname');
       assume(o.origin).equals('http://google.com');