feat(dart/transform): Detect annotations which extend Injectable or Template.

Create a method that recursively walks imports from an entry point and
determines where classes are registered.

Use this information to determine if a particular annotation implements or
extends Injectable or Template.

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

@@ -1,24 +1,47 @@
 library angular2.test.transform.directive_processor.all_tests;
 
+import 'package:barback/barback.dart';
 import 'package:angular2/src/transform/directive_processor/rewriter.dart';
+import '../common/read_file.dart';
+import 'package:angular2/src/transform/common/classdef_parser.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:guinness/guinness.dart';
-
-import '../common/read_file.dart';
+import 'package:path/path.dart' as path;
 
 var formatter = new DartFormatter();
 
+main() {
+  allTests();
+}
+
 void allTests() {
-  it('should preserve parameter annotations as const instances.', () {
-    var inputPath = 'parameter_metadata/soup.dart';
-    var expected = _readFile('parameter_metadata/expected/soup.ng_deps.dart');
-    var output =
-        formatter.format(createNgDeps(_readFile(inputPath), inputPath));
+  _testNgDeps('should preserve parameter annotations as const instances.',
+      'parameter_metadata/soup.dart');
+
+  _testNgDeps('should recognize annotations which extend Injectable.',
+      'custom_metadata/tortilla_soup.dart');
+
+  _testNgDeps('should recognize annotations which implement Injectable.',
+      'custom_metadata/chicken_soup.dart');
+
+  _testNgDeps(
+      'should recognize annotations which implement a class that extends '
+      'Injectable.', 'custom_metadata/chicken_soup.dart');
+}
+
+void _testNgDeps(String name, String inputPath) {
+  it(name, () async {
+    var inputId = _assetIdForPath(inputPath);
+    var reader = new TestAssetReader();
+    var defMap = await createTypeMap(reader, inputId);
+    var input = await reader.readAsString(inputId);
+    var output = formatter.format(createNgDeps(input, inputPath, defMap));
+    var expectedPath = path.join(path.dirname(inputPath), 'expected',
+        path.basename(inputPath).replaceFirst('.dart', '.ng_deps.dart'));
+    var expected = await reader.readAsString(_assetIdForPath(expectedPath));
     expect(output).toEqual(expected);
   });
 }
 
-var pathBase = 'directive_processor';
-
-/// Smooths over differences in CWD between IDEs and running tests in Travis.
-String _readFile(String path) => readFile('$pathBase/$path');
+AssetId _assetIdForPath(String path) =>
+    new AssetId('angular2', 'test/transform/directive_processor/$path');

modules/angular2/test/transform/directive_processor/custom_metadata/chicken_soup.dart

@@ -0,0 +1,19 @@
+library dinner.chicken_soup;
+
+import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/facade/lang.dart' show CONST;
+
+class Food implements Injectable {
+  @CONST()
+  const Food() : super();
+}
+
+class Soup extends Food {
+  @CONST()
+  const Soup() : super();
+}
+
+@Soup()
+class ChickenSoup {
+  ChickenSoup();
+}

modules/angular2/test/transform/directive_processor/custom_metadata/expected/chicken_soup.ng_deps.dart

@@ -0,0 +1,17 @@
+library dinner.chicken_soup.ng_deps.dart;
+
+import 'chicken_soup.dart';
+import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/facade/lang.dart' show CONST;
+
+bool _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(ChickenSoup, {
+      'factory': () => new ChickenSoup(),
+      'parameters': const [],
+      'annotations': const [const Soup()]
+    });
+}

modules/angular2/test/transform/directive_processor/custom_metadata/expected/split_pea_soup.ng_deps.dart

@@ -0,0 +1,17 @@
+library dinner.split_pea_soup.ng_deps.dart;
+
+import 'split_pea_soup.dart';
+import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/facade/lang.dart' show CONST;
+
+bool _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(SplitPea, {
+      'factory': () => new SplitPea(),
+      'parameters': const [],
+      'annotations': const [const Soup()]
+    });
+}

modules/angular2/test/transform/directive_processor/custom_metadata/expected/tortilla_soup.ng_deps.dart

@@ -0,0 +1,17 @@
+library dinner.tortilla_soup.ng_deps.dart;
+
+import 'tortilla_soup.dart';
+import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/facade/lang.dart' show CONST;
+
+bool _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(TortillaSoup, {
+      'factory': () => new TortillaSoup(),
+      'parameters': const [],
+      'annotations': const [const Soup()]
+    });
+}

modules/angular2/test/transform/directive_processor/custom_metadata/split_pea_soup.dart

@@ -0,0 +1,19 @@
+library dinner.split_pea_soup;
+
+import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/facade/lang.dart' show CONST;
+
+class Food extends Injectable {
+  @CONST()
+  const Food() : super();
+}
+
+class Soup implements Food {
+  @CONST()
+  const Soup() : super();
+}
+
+@Soup()
+class SplitPeaSoup {
+  SplitPeaSoup();
+}

modules/angular2/test/transform/directive_processor/custom_metadata/tortilla_soup.dart

@@ -0,0 +1,19 @@
+library dinner.tortilla_soup;
+
+import 'package:angular2/di.dart' show Injectable;
+import 'package:angular2/src/facade/lang.dart' show CONST;
+
+class Food extends Injectable {
+  @CONST()
+  const Food() : super();
+}
+
+class Soup extends Food {
+  @CONST()
+  const Soup() : super();
+}
+
+@Soup()
+class TortillaSoup {
+  TortillaSoup();
+}