Ternary operator support for polymer_expressions

pkg/polymer_expressions/test/eval_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library eval_test;
 
 import 'dart:async';
 
 // Import mirrors to cause all mirrors to be retained by dart2js.
 // The tests reflect on LinkedHashMap.length and String.length.
@@ skipping 90 matching lines @@
       expectEval('true || false', true);
       expectEval('false || true', true);
       expectEval('false || false', false);
 
       expectEval('true && true', true);
       expectEval('true && false', false);
       expectEval('false && true', false);
       expectEval('false && false', false);
     });
 
+    test('should evaulate ternary operators', () {
+      expectEval('true ? 1 : 2', 1);
+      expectEval('false ? 1 : 2', 2);
+      expectEval('true ? true ? 1 : 2 : 3', 1);
+      expectEval('true ? false ? 1 : 2 : 3', 2);
+      expectEval('false ? true ? 1 : 2 : 3', 3);
+      expectEval('false ? 1 : true ? 2 : 3', 2);
+      expectEval('false ? 1 : false ? 2 : 3', 3);

[Jennifer Messerly, 2014/01/28 00:03:29]

maybe add a test for `null` and some other kind of value (e.g. 42) in the
condition?

[justinfagnani, 2014/01/28 01:05:21]

Done.

+    });
+
     test('should invoke a method on the model', () {
       var foo = new Foo(name: 'foo', age: 2);
       expectEval('x()', foo.x(), foo);
       expectEval('name', foo.name, foo);
     });
 
     test('should invoke chained methods', () {
       var foo = new Foo(name: 'foo', age: 2);
       expectEval('name.length', foo.name.length, foo);
       expectEval('x().toString()', foo.x().toString(), foo);
@@ skipping 275 matching lines @@
   return Future.wait([future, new Future(() {
     expect(passed, true, reason: "Didn't receive a change notification on $s");
   })]);
 }
 
 // Regression test from https://code.google.com/p/dart/issues/detail?id=13459
 class WordElement extends Observable {
   @observable List chars1 = 'abcdefg'.split('');
   @reflectable List filteredList(List original) => [original[0], original[1]];
 }