Creates `reflectors`, as a meta-meta feature that enables dynamic selection of a "mirror system".

test_reflectable/test/meta_reflectors_scoping.dart

Index: test_reflectable/test/meta_reflectors_scoping.dart
diff --git a/test_reflectable/test/meta_reflectors_scoping.dart b/test_reflectable/test/meta_reflectors_scoping.dart
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+// Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+// File being transformed by the reflectable transformer.
+// Part of the entry point 'reflectors_test.dart'.
+//
+// Independence: The `MetaReflector` class is independent of the particular
+// entry point 'reflectors_test.dart' and its transitive closure, it could be
+// in a third-party package only depending on reflectable.
+
+library test_reflectable.test.meta_reflectors_scoping;
+
+import 'package:reflectable/reflectable.dart';
+
+/// Used to provide access to reflectors associated with a given scope,
+/// which is a [String]. The connection is created by top level functions
+/// in the program with the annotation `@MetaReflector()`. Such a function
+/// must have type `F` where `typedef Iterable<Reflectable> F(String _)`,
+/// and it is assumed to return the set of reflectors which belong to the
+/// scope specified by the argument.
+class ScopeMetaReflector extends Reflectable {
+  const ScopeMetaReflector()
+      : super(const TopLevelInvokeMetaCapability(ScopeMetaReflector),
+            declarationsCapability, libraryCapability);
+  Set<Reflectable> reflectablesOfScope(String scope) {
+    Set<Reflectable> result = new Set<Reflectable>();
+    for (LibraryMirror library in libraries.values) {
+      for (DeclarationMirror declaration in library.declarations.values) {
+        result.addAll(library.invoke(declaration.simpleName, [scope]));
+      }
+    }
+    return result;
+  }
+}