feat(transformers): implement initializing deferred libraries

Implement deferred libraries to work with dependency injection and other
angular codegen. This is done by not initializing the library in the parent
ng_deps file when it is declared as deferred, rewriting the import and,
chaining a future that initializes the library in any files that are using
deferred libraries which need angular codegen.

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

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+library angular2.test.transform.deferred_rewriter.all_tests;
+
+import 'package:barback/barback.dart';
+import 'package:angular2/src/transform/deferred_rewriter/transformer.dart';
+import 'package:angular2/src/transform/common/annotation_matcher.dart';
+import 'package:angular2/src/transform/common/asset_reader.dart';
+import 'package:angular2/src/transform/common/logging.dart' as log;
+import 'package:code_transformers/messages/build_logger.dart';
+import 'package:dart_style/dart_style.dart';
+import 'package:guinness/guinness.dart';
+import 'package:path/path.dart' as path;
+import '../common/read_file.dart';
+
+var formatter = new DartFormatter();
+
+main() {
+  allTests();
+}
+
+void allTests() {
+  _testRewriteDeferredLibraries(
+      'should return null when no deferred libraries found.',
+      'no_deferred_libraries/index.dart');
+  _testRewriteDeferredLibraries(
+      'should return null when deferred libraries with no ng_deps.',
+      'no_ng_deps_libraries/index.dart');
+  _testRewriteDeferredLibraries(
+      'should rewrite deferred libraries with ng_deps.',
+      'simple_deferred_example/index.dart');
+  _testRewriteDeferredLibraries(
+      'should not rewrite deferred libraries without ng_deps.',
+      'deferred_example_no_ng_deps/index.dart');
+  _testRewriteDeferredLibraries(
+      'should rewrite deferred libraries with ng_deps leave other deferred library alone.',
+      'complex_deferred_example/index.dart');
+}
+
+void _testRewriteDeferredLibraries(String name, String inputPath) {
+  it(name, () async {
+    var inputId = _assetIdForPath(inputPath);
+    var reader = new TestAssetReader();
+    var expectedPath = path.join(
+        path.dirname(inputPath), 'expected', path.basename(inputPath));
+    var expectedId = _assetIdForPath(expectedPath);
+
+    var output = await rewriteDeferredLibraries(reader, inputId);
+    var input = await reader.readAsString(expectedId);
+    if (input == null) {
+      // Null input signals no output. Ensure that is true.
+      expect(output).toBeNull();
+    } else {
+      expect(formatter.format(output)).toEqual(formatter.format(input));
+    }
+  });
+}
+
+AssetId _assetIdForPath(String path) =>
+    new AssetId('angular2', 'test/transform/deferred_rewriter/$path');

modules/angular2/test/transform/deferred_rewriter/complex_deferred_example/expected/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+import 'hello.ng_deps.dart' deferred as a; // ng_deps. Should be rewritten.
+import 'b.dart' deferred as b; // No ng_deps. Shouldn't be rewritten.
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  a.loadLibrary().then((_) {
+    a.initReflector();
+  }).then((_) {
+    bootstrap(a.HelloCmp);
+  });
+  b.loadLibrary();
+}

modules/angular2/test/transform/deferred_rewriter/complex_deferred_example/hello.dart

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+library examples.src.hello_world.absolute_url_expression_files;
+
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+@Component(selector: 'hello-app')
+@View(templateUrl: 'package:other_package/template.html')
+class HelloCmp {}

modules/angular2/test/transform/deferred_rewriter/complex_deferred_example/hello.ng_deps.dart

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+library examples.src.hello_world.absolute_url_expression_files.ng_deps.dart;
+
+import 'hello.dart';
+export 'hello.dart';
+import 'package:angular2/src/reflection/reflection.dart' as _ngRef;
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+var _visited = false;
+void initReflector() {
+  if (_visited) return;
+  _visited = true;
+  _ngRef.reflector
+    ..registerType(HelloCmp, {
+      'factory': () => new HelloCmp(),
+      'parameters': const [],
+      'annotations': const [
+        const Component(selector: 'hello-app'),
+        const View(
+            template: r'''{{greeting}}''',
+            templateUrl: r'package:other_package/template.html')
+      ]
+    });
+}

modules/angular2/test/transform/deferred_rewriter/complex_deferred_example/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+import 'hello.dart' deferred as a; // ng_deps. Should be rewritten.
+import 'b.dart' deferred as b; // No ng_deps. Shouldn't be rewritten.
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  a.loadLibrary().then((_) {
+    bootstrap(a.HelloCmp);
+  });
+  b.loadLibrary();
+}

modules/angular2/test/transform/deferred_rewriter/deferred_example_no_ng_deps/hello.dart

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+library examples.src.hello_world.absolute_url_expression_files;
+
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+@Component(selector: 'hello-app')
+@View(templateUrl: 'package:other_package/template.html')
+class HelloCmp {}

modules/angular2/test/transform/deferred_rewriter/deferred_example_no_ng_deps/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+import 'hello.dart' deferred as a;
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  a.loadLibrary().then((_) {
+    bootstrap(a.HelloCmp);
+  });
+}

modules/angular2/test/transform/deferred_rewriter/no_deferred_libraries/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  bootstrap(MyComponent);
+}

modules/angular2/test/transform/deferred_rewriter/no_ng_deps_libraries/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+import 'a.dart' deferred as a;
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  bootstrap(MyComponent);
+}

modules/angular2/test/transform/deferred_rewriter/simple_deferred_example/expected/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+import 'hello.ng_deps.dart' deferred as a;
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  a.loadLibrary().then((_) {
+    a.initReflector();
+  }).then((_) {
+    bootstrap(a.HelloCmp);
+  });
+}

modules/angular2/test/transform/deferred_rewriter/simple_deferred_example/hello.dart

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+library examples.src.hello_world.absolute_url_expression_files;
+
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+@Component(selector: 'hello-app')
+@View(templateUrl: 'package:other_package/template.html')
+class HelloCmp {}

modules/angular2/test/transform/deferred_rewriter/simple_deferred_example/hello.ng_deps.dart

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+library examples.src.hello_world.absolute_url_expression_files.ng_deps.dart;
+
+import 'hello.dart';
+export 'hello.dart';
+import 'package:angular2/src/reflection/reflection.dart' as _ngRef;
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+var _visited = false;
+void initReflector() {
+  if (_visited) return;
+  _visited = true;
+  _ngRef.reflector
+    ..registerType(HelloCmp, {
+      'factory': () => new HelloCmp(),
+      'parameters': const [],
+      'annotations': const [
+        const Component(selector: 'hello-app'),
+        const View(
+            template: r'''{{greeting}}''',
+            templateUrl: r'package:other_package/template.html')
+      ]
+    });
+}

modules/angular2/test/transform/deferred_rewriter/simple_deferred_example/index.dart

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+library web_foo;
+
+import 'package:angular2/src/core/application.dart';
+import 'package:angular2/src/reflection/reflection.dart';
+import 'package:angular2/src/reflection/reflection_capabilities.dart';
+import 'hello.dart' deferred as a;
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  a.loadLibrary().then((_) {
+    bootstrap(a.HelloCmp);
+  });
+}