Revert "Delete support for source mirrors"

tests/compiler/dart2js/mirrors_metadata_test.dart

Index: tests/compiler/dart2js/mirrors_metadata_test.dart
diff --git a/tests/compiler/dart2js/mirrors_metadata_test.dart b/tests/compiler/dart2js/mirrors_metadata_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4097da71210bc314daa10a3147d461931557516d
--- /dev/null
+++ b/tests/compiler/dart2js/mirrors_metadata_test.dart
@@ -0,0 +1,86 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:expect/expect.dart';
+import "package:async_helper/async_helper.dart";
+import 'dart:async';
+import 'mirror_system_helper.dart';
+
+Future validateDeclarationComment(String code,
+                                String text,
+                                String trimmedText,
+                                bool isDocComment,
+                                List<Symbol> declarationNames) {
+  return createMirrorSystem(code).then((mirrors) {
+    LibraryMirror library = mirrors.libraries[SOURCE_URI];
+    Expect.isNotNull(library);
+    for (Symbol declarationName in declarationNames) {
+      DeclarationMirror declaration = library.declarations[declarationName];
+      Expect.isNotNull(declaration);
+      List<InstanceMirror> metadata = declaration.metadata;
+      Expect.isNotNull(metadata);
+      Expect.equals(1, metadata.length);
+      Expect.isTrue(metadata[0] is CommentInstanceMirror);
+      CommentInstanceMirror commentMetadata = metadata[0];
+      Expect.equals(text, commentMetadata.text);
+      Expect.equals(trimmedText, commentMetadata.trimmedText);
+      Expect.equals(isDocComment, commentMetadata.isDocComment);
+    }
+  });
+}
+
+Future testDeclarationComment(String declaration,
+                              List<Symbol> declarationNames) {
+  return Future.forEach([
+    () {
+      String text = 'Single line comment';
+      String comment = '// $text';
+      String code = '$comment\n$declaration';
+      return validateDeclarationComment(
+          code, comment, text, false, declarationNames);
+    },
+    () {
+      String text = 'Single line comment';
+      String comment = '/// $text';
+      String code = '$comment\n$declaration';
+      return validateDeclarationComment(
+          code, comment, text, true, declarationNames);
+    },
+    () {
+      String text = 'Multiline comment';
+      String comment = '/* $text*/';
+      String code = '$comment$declaration';
+      return validateDeclarationComment(
+          code, comment, text, false, declarationNames);
+    },
+    () {
+      String text = 'Multiline comment';
+      String comment = '/** $text*/';
+      String code = '$comment$declaration';
+      return validateDeclarationComment(
+          code, comment, text, true, declarationNames);
+    },
+  ], (f) => f());
+}
+
+void main() {
+  asyncTest(() => Future.forEach([
+    () => testDeclarationComment('var field;', [#field]),
+    () => testDeclarationComment('int field;', [#field]),
+    () => testDeclarationComment('int field = 0;', [#field]),
+    () => testDeclarationComment('int field1, field2;', [#field1, #field2]),
+    () => testDeclarationComment('final field = 0;', [#field]),
+    () => testDeclarationComment('final int field = 0;', [#field]),
+    () => testDeclarationComment('final field1 = 0, field2 = 0;',
+                                 [#field1, #field2]),
+    () => testDeclarationComment('final int field1 = 0, field2 = 0;',
+                                 [#field1, #field2]),
+    () => testDeclarationComment('const field = 0;', [#field]),
+    () => testDeclarationComment('const int field = 0;', [#field]),
+    () => testDeclarationComment('const field1 = 0, field2 = 0;',
+                                 [#field1, #field2]),
+    () => testDeclarationComment('const int field1 = 0, field2 = 0;',
+                                 [#field1, #field2]),
+  ], (f) => f()));
+}