feat(dart/transform): Add the DirectiveMetadataReader

Add a class that parses and reads Directive metadata to prepare for
running the Render compiler in the Dart transformer.

modules/angular2/test/transform/template_compiler/all_tests.dart

@@ -3,6 +3,8 @@ library angular2.test.transform.template_compiler.all_tests;
 import 'package:barback/barback.dart';
 import 'package:angular2/src/dom/html_adapter.dart';
 import 'package:angular2/src/transform/common/asset_reader.dart';
+import 'package:angular2/src/transform/common/parser.dart';
+import 'package:angular2/src/transform/template_compiler/directive_metadata_reader.dart';
 import 'package:angular2/src/transform/template_compiler/generator.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:guinness/guinness.dart';
@@ -14,6 +16,7 @@ var formatter = new DartFormatter();
 void allTests() {
   Html5LibDomAdapter.makeCurrent();
   AssetReader reader = new TestAssetReader();
+  var parser = new Parser(reader);
 
   it('should parse simple expressions in inline templates.', () async {
     var inputPath =
@@ -47,6 +50,48 @@ void allTests() {
     var output = await processTemplates(reader, new AssetId('a', inputPath));
     _formatThenExpectEquals(output, expected);
   });
+
+  describe('DirectiveMetadataReader', () {
+    it('should parse simple expressions in inline templates', () async {
+      var inputPath =
+          'template_compiler/inline_expression_files/hello.ng_deps.dart';
+      var ngDeps = await parser.parse(new AssetId('a', inputPath));
+
+      var metadata = readDirectiveMetadata(ngDeps.registeredTypes.first);
+      expect(metadata.length).toEqual(2);
+      expect(metadata[0].selector).toEqual('hello-app');
+    });
+
+    it('should parse simple methods in inline templates', () async {
+      var inputPath =
+      'template_compiler/inline_method_files/hello.ng_deps.dart';
+      var ngDeps = await parser.parse(new AssetId('a', inputPath));
+
+      var metadata = readDirectiveMetadata(ngDeps.registeredTypes.first);
+      expect(metadata.length).toEqual(2);
+      expect(metadata[0].selector).toEqual('hello-app');
+    });
+
+    it('should parse simple expressions in linked templates.', () async {
+      var inputPath =
+      'template_compiler/url_expression_files/hello.ng_deps.dart';
+      var ngDeps = await parser.parse(new AssetId('a', inputPath));
+
+      var metadata = readDirectiveMetadata(ngDeps.registeredTypes.first);
+      expect(metadata.length).toEqual(2);
+      expect(metadata[0].selector).toEqual('hello-app');
+    });
+
+    it('should parse simple methods in linked templates.', () async {
+      var inputPath =
+      'template_compiler/url_method_files/hello.ng_deps.dart';
+      var ngDeps = await parser.parse(new AssetId('a', inputPath));
+
+      var metadata = readDirectiveMetadata(ngDeps.registeredTypes.first);
+      expect(metadata.length).toEqual(2);
+      expect(metadata[0].selector).toEqual('hello-app');
+    });
+  });
 }
 
 void _formatThenExpectEquals(String actual, String expected) {