feat(i18n): implement xmb serializer

modules/angular2/pubspec.yaml

@@ -20,6 +20,8 @@ dependencies:
   protobuf: '^0.5.0'
   source_span: '^1.0.0'
   stack_trace: '^1.1.1'
+  build:
+    git: git@github.com:dart-lang/build.git
 dev_dependencies:
   transformer_test: '^0.2.0'
   guinness: '^0.1.18'

modules/angular2/src/i18n/xmb_serializer.ts

@@ -0,0 +1,12 @@
+import {isPresent} from 'angular2/src/facade/lang';
+import {Message, id} from './message';
+
+export function serialize(messages: Message[]): string {
+  let ms = messages.map((m) => _serializeMessage(m)).join("");
+  return `<message-bundle>${ms}</message-bundle>`;
+}
+
+function _serializeMessage(m: Message): string {
+  let desc = isPresent(m.description) ? ` desc='${m.description}'` : "";
+  return `<msg id='${id(m)}'${desc}>${m.content}</msg>`;
+}

modules/angular2/test/i18n/xmb_serializer_spec.ts

@@ -0,0 +1,35 @@
+import {
+  AsyncTestCompleter,
+  beforeEach,
+  ddescribe,
+  describe,
+  expect,
+  iit,
+  inject,
+  it,
+  xdescribe,
+  xit
+} from 'angular2/testing_internal';
+
+import {Message, id} from 'angular2/src/i18n/message';
+import {serialize} from 'angular2/src/i18n/xmb_serializer';
+
+export function main() {
+  describe('Xmb Serialization', () => {
+    it("should return an empty message bundle for an empty list of messages",
+       () => { expect(serialize([])).toEqual("<message-bundle></message-bundle>"); });
+
+    it("should serialize messages without desc", () => {
+      let m = new Message("content", "meaning", null);
+      let expected = `<message-bundle><msg id='${id(m)}'>content</msg></message-bundle>`;
+      expect(serialize([m])).toEqual(expected);
+    });
+
+    it("should serialize messages with desc", () => {
+      let m = new Message("content", "meaning", "description");
+      let expected =
+          `<message-bundle><msg id='${id(m)}' desc='description'>content</msg></message-bundle>`;
+      expect(serialize([m])).toEqual(expected);
+    });
+  });
+}