Add support for parsing annotations with Fasta.

pkg/analyzer/test/generated/parser_test.dart

Index: pkg/analyzer/test/generated/parser_test.dart
diff --git a/pkg/analyzer/test/generated/parser_test.dart b/pkg/analyzer/test/generated/parser_test.dart
index bdc478523abe6f536dcb093a6f856a4307fd6eb8..68fc5a672a8f88892e3c17b3ec56df29c4f944cc 100644
--- a/pkg/analyzer/test/generated/parser_test.dart
+++ b/pkg/analyzer/test/generated/parser_test.dart
@@ -13412,6 +13412,56 @@ abstract class TopLevelParserTestMixin implements AbstractParserTestCase {
     expectCommentText(classDeclaration.documentationComment, '/// Doc');
   }
 
+  void test_parseClassDeclaration_metadata() {
+    createParser('@A @B(2) @C.foo(3) @d.E.bar(4, 5) class X {}');
+    var declaration = parseFullCompilationUnitMember() as ClassDeclaration;
+    expect(declaration.metadata, hasLength(4));
+
+    {
+      var annotation = declaration.metadata[0];
+      expect(annotation.atSign, isNotNull);
+      expect(annotation.name, new isInstanceOf<SimpleIdentifier>());
+      expect(annotation.name.name, 'A');
+      expect(annotation.period, isNull);
+      expect(annotation.constructorName, isNull);
+      expect(annotation.arguments, isNull);
+    }
+
+    {
+      var annotation = declaration.metadata[1];
+      expect(annotation.atSign, isNotNull);
+      expect(annotation.name, new isInstanceOf<SimpleIdentifier>());
+      expect(annotation.name.name, 'B');
+      expect(annotation.period, isNull);
+      expect(annotation.constructorName, isNull);
+      expect(annotation.arguments, isNotNull);
+      expect(annotation.arguments.arguments, hasLength(1));
+    }
+
+    {
+      var annotation = declaration.metadata[2];
+      expect(annotation.atSign, isNotNull);
+      expect(annotation.name, new isInstanceOf<PrefixedIdentifier>());
+      expect(annotation.name.name, 'C.foo');
+      expect(annotation.period, isNull);
+      expect(annotation.constructorName, isNull);
+      expect(annotation.arguments, isNotNull);
+      expect(annotation.arguments.arguments, hasLength(1));
+    }
+
+    {
+      var annotation = declaration.metadata[3];
+      expect(annotation.atSign, isNotNull);
+      expect(annotation.name, new isInstanceOf<PrefixedIdentifier>());
+      expect(annotation.name.name, 'd.E');
+      expect(annotation.period, isNotNull);
+      expect(annotation.constructorName, isNotNull);
+      expect(annotation.constructorName.name, 'bar');
+      expect(annotation.arguments, isNotNull);
+      expect(annotation.arguments.arguments, hasLength(2));
+    }
+  }
+
   void test_parseClassTypeAlias_withDocumentationComment() {
     createParser('/// Doc\nclass C = D with E;');
     var classTypeAlias = parseFullCompilationUnitMember() as ClassTypeAlias;