fix(transformer): Support prefixed annotations in the transformer.

closes https://github.com/angular/angular/issues/2754

modules/angular2/src/transform/common/annotation_matcher.dart

@@ -127,17 +127,37 @@ class AnnotationMatcher {
   // Checks if an [Annotation] matches an [AnnotationDescriptor].
   static bool _matchAnnotation(
       Annotation annotation, AnnotationDescriptor descriptor, AssetId assetId) {
-    if (annotation.name.name != descriptor.name) return false;
+    String name;
+    Identifier prefix;
+    if (annotation.name is PrefixedIdentifier) {
+      // TODO(jakemac): Shouldn't really need a cast here, remove once
+      // https://github.com/dart-lang/sdk/issues/23798 is fixed.
+      var prefixedName = annotation.name as PrefixedIdentifier;
+      name = prefixedName.identifier.name;
+      prefix = prefixedName.prefix;
+    } else {
+      name = annotation.name.name;
+    }
+    if (name != descriptor.name) return false;
     return (annotation.root as CompilationUnit).directives
         .where((d) => d is ImportDirective)
         .any((ImportDirective i) {
+      var importMatch = false;
       var uriString = i.uri.stringValue;
-      if (uriString == descriptor.import) return true;
-      if (uriString.startsWith('package:') || uriString.startsWith('dart:')) {
+      if (uriString == descriptor.import) {
+        importMatch = true;
+      } else if (uriString.startsWith('package:') ||
+          uriString.startsWith('dart:')) {
         return false;
+      } else {
+        importMatch = descriptor.assetId ==
+            uriToAssetId(assetId, uriString, logger, null);
       }
-      return descriptor.assetId ==
-          uriToAssetId(assetId, uriString, logger, null);
+
+      if (!importMatch) return false;
+      if (prefix == null) return i.prefix == null;
+      if (i.prefix == null) return false;
+      return prefix.name == i.prefix.name;
     });
   }
 }

modules/angular2/src/transform/template_compiler/view_definition_creator.dart

@@ -36,8 +36,13 @@ class ViewDefinitionEntry {
 String _getComponentId(AssetId assetId, String className) => '$className';
 
 // TODO(kegluenq): Improve this test.
-bool _isViewAnnotation(InstanceCreationExpression node) =>
-    '${node.constructorName.type}' == 'View';
+bool _isViewAnnotation(InstanceCreationExpression node) {
+  var constructorName = node.constructorName.type.name;
+  if (constructorName is PrefixedIdentifier) {
+    constructorName = constructorName.identifier;
+  }
+  return constructorName.name == 'View';
+}
 
 /// Creates [ViewDefinition] objects for all `View` `Directive`s defined in
 /// `entryPoint`.

modules/angular2/test/transform/common/annotation_matcher_test.dart

@@ -0,0 +1,104 @@
+library angular2.test.transform.common.annotation_matcher_test;
+
+import 'dart:async';
+import 'package:analyzer/analyzer.dart';
+import 'package:angular2/src/transform/common/annotation_matcher.dart';
+import 'package:barback/barback.dart' show AssetId;
+import 'package:guinness/guinness.dart';
+
+main() {
+  allTests();
+}
+
+var simpleAst = parseCompilationUnit('''
+import 'package:test/test.dart';
+
+@Test()
+var foo;
+''');
+
+var namespacedAst = parseCompilationUnit('''
+import 'package:test/test.dart' as test;
+
+@test.Test()
+var foo;
+''');
+
+var relativePathAst = parseCompilationUnit('''
+import 'test.dart';
+
+@Test()
+var foo;
+''');
+
+var namespacedRelativePathAst = parseCompilationUnit('''
+import 'test.dart' as test;
+
+@test.Test()
+var foo;
+''');
+
+void allTests() {
+  it('should be able to match basic annotations.', () {
+    var matcher = new AnnotationMatcher()
+      ..add(const AnnotationDescriptor('Test', 'package:test/test.dart', null));
+    var visitor = new MatchRecordingVisitor(matcher);
+    simpleAst.accept(visitor);
+    expect(visitor.matches.length).toBe(1);
+  });
+
+  it('should be able to match namespaced annotations.', () {
+    var matcher = new AnnotationMatcher()
+      ..add(const AnnotationDescriptor('Test', 'package:test/test.dart', null));
+    var visitor = new MatchRecordingVisitor(matcher);
+    namespacedAst.accept(visitor);
+    expect(visitor.matches.length).toBe(1);
+  });
+
+  it('should be able to match relative imports.', () {
+    var matcher = new AnnotationMatcher()
+      ..add(const AnnotationDescriptor('Test', 'package:test/test.dart', null));
+    var visitor =
+        new MatchRecordingVisitor(matcher, new AssetId('test', 'lib/foo.dart'));
+    relativePathAst.accept(visitor);
+    expect(visitor.matches.length).toBe(1);
+  });
+
+  it('should be able to match relative imports with a namespace.', () {
+    var matcher = new AnnotationMatcher()
+      ..add(const AnnotationDescriptor('Test', 'package:test/test.dart', null));
+    var visitor =
+        new MatchRecordingVisitor(matcher, new AssetId('test', 'lib/foo.dart'));
+    namespacedRelativePathAst.accept(visitor);
+    expect(visitor.matches.length).toBe(1);
+  });
+
+  it('should not match annotations if the import is missing.', () {
+    var matcher = new AnnotationMatcher()
+      ..add(const AnnotationDescriptor('Test', 'package:test/foo.dart', null));
+    var visitor = new MatchRecordingVisitor(matcher);
+    simpleAst.accept(visitor);
+    expect(visitor.matches.isEmpty).toBeTrue();
+  });
+
+  it('should not match annotations if the name is different.', () {
+    var matcher = new AnnotationMatcher()
+      ..add(const AnnotationDescriptor('Foo', 'package:test/test.dart', null));
+    var visitor = new MatchRecordingVisitor(matcher);
+    simpleAst.accept(visitor);
+    expect(visitor.matches.isEmpty).toBeTrue();
+  });
+}
+
+class MatchRecordingVisitor extends RecursiveAstVisitor {
+  final AssetId assetId;
+  final AnnotationMatcher matcher;
+  final List<Annotation> matches = [];
+
+  MatchRecordingVisitor(this.matcher, [this.assetId]) : super();
+
+  @override
+  void visitAnnotation(Annotation annotation) {
+    if (matcher.hasMatch(annotation, assetId)) matches.add(annotation);
+  }
+}

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

@@ -13,6 +13,8 @@ import '../common/read_file.dart';
 
 var formatter = new DartFormatter();
 
+main() => allTests();
+
 void allTests() {
   Html5LibDomAdapter.makeCurrent();
   AssetReader reader = new TestAssetReader();
@@ -93,6 +95,16 @@ void allTests() {
       _formatThenExpectEquals(output, expected);
     });
 
+    it('should parse angular directives with a prefix', () async {
+      var inputPath =
+          'template_compiler/with_prefix_files/ng2_prefix.ng_deps.dart';
+      var expected = readFile(
+          'template_compiler/with_prefix_files/expected/ng2_prefix.ng_deps.dart');
+
+      var output = await process(new AssetId('a', inputPath));
+      _formatThenExpectEquals(output, expected);
+    });
+
     it('should create the same output for multiple calls.', () async {
       var inputPath =
           'template_compiler/inline_expression_files/hello.ng_deps.dart';

modules/angular2/test/transform/template_compiler/with_prefix_files/expected/ng2_prefix.ng_deps.dart

@@ -0,0 +1,22 @@
+library angular2.test.transform.template_compiler.with_prefix_files.ng2_prefix.ng_deps.dart;
+
+import 'ng2_prefix.dart';
+import 'package:angular2/angular2.dart' as ng2
+    show bootstrap, Component, Directive, View, NgElement;
+
+var _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(MyApp, {
+      'factory': () => new MyApp(),
+      'parameters': const [const []],
+      'annotations': const [
+        const ng2.Component(selector: 'my-app'),
+        const ng2.View(template: 'MyApp {{name}}')
+      ]
+    })
+    ..registerGetters({'name': (o) => o.name})
+    ..registerSetters({'name': (o, v) => o.name = v});
+}

modules/angular2/test/transform/template_compiler/with_prefix_files/ng2_prefix.ng_deps.dart

@@ -0,0 +1,20 @@
+library angular2.test.transform.template_compiler.with_prefix_files.ng2_prefix.ng_deps.dart;
+
+import 'ng2_prefix.dart';
+import 'package:angular2/angular2.dart' as ng2
+    show bootstrap, Component, Directive, View, NgElement;
+
+var _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(MyApp, {
+      'factory': () => new MyApp(),
+      'parameters': const [const []],
+      'annotations': const [
+        const ng2.Component(selector: 'my-app'),
+        const ng2.View(template: 'MyApp {{name}}')
+      ]
+    });
+}

modules/angular2/test/transform/template_compiler/with_prefix_files/ng2_prefix.ng_meta.json

@@ -0,0 +1,12 @@
+{
+  "MyApp":{
+    "id":"MyApp",
+    "selector":"my-app",
+    "compileChildren":true,
+    "host":{},
+    "properties":[],
+    "readAttributes":[],
+    "type":1,
+    "version":1
+  }
+}