Add property base to the Uri class

sdk/lib/_internal/lib/core_patch.dart

Index: sdk/lib/_internal/lib/core_patch.dart
diff --git a/sdk/lib/_internal/lib/core_patch.dart b/sdk/lib/_internal/lib/core_patch.dart
index aaa816442dc320e3b21552d9f60f39a1e1f26b10..8384896b28b8c92b5352b9aa22682ff199c5a1b8 100644
--- a/sdk/lib/_internal/lib/core_patch.dart
+++ b/sdk/lib/_internal/lib/core_patch.dart
@@ -3,13 +3,14 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // Patch file for dart:core classes.
+import "dart:_collection-dev" as _symbol_dev;
+import 'dart:_foreign_helper' show JS;

[floitsch, 2013/09/17 11:49:11]

I think the dart2js doesn't want JS except in the _foreign_helper.

[Søren Gjesse, 2013/09/17 11:59:53]

I don't understand this comment.

[ahe, 2013/09/17 12:23:48]

It would be better to add a "primitive" to the class Primitives in
js_helper.dart.

[Søren Gjesse, 2013/09/17 14:12:10]

OK, that was also what floitsch@ ment - I just saw the direct use of JS in quite
a few places. Added currentUri to Primitives.

 import 'dart:_interceptors';
 import 'dart:_js_helper' show checkNull,
                               getRuntimeType,
                               JSSyntaxRegExp,
                               Primitives,
                               stringJoinUnchecked;
-import "dart:_collection-dev" as _symbol_dev;
 
 String _symbolToString(Symbol symbol) => _symbol_dev.Symbol.getName(symbol);
 
@@ -311,4 +312,12 @@ patch class NoSuchMethodError {
 
 patch class Uri {
   patch static bool get _isWindows => false;
+
+  patch static Uri get base {
+    if (JS('bool', 'typeof window != "undefined" && window !== null')) {
+      return Uri.parse(JS('String', 'window.location.href'));
+    } else {
+      throw new UnsupportedError("No base URI available on this platform");
+    }
+  }
 }