Preliminary checked mirrors (not ready for review yet)

pkg/checked_mirrors/example/meta_target.dart

+// Copyright (c) 2013, 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.
+
+/// Example illustrating how to use checked_mirrors, and how it works when you
+/// declare a meta-target with [MirrorsUsed].
+library checked_mirrors.example.meta_target;
+
+import 'package:checked_mirrors/checked_mirrors.dart';
+import 'package:checked_mirrors/control.dart' as control;
+import 'package:logging/logging.dart';
+
+// Typically this annotation goes in an import to 'dart:mirrors', we would like
+// to put it in the import of checked_mirrors, but we moved it here until
+// dartbug.com/10360 is fixed.
+@MirrorsUsed(metaTargets: const[Reflected])
+const checked_mirrors_workaround_for_issue_10360 = 0;
+
+class Reflected { const Reflected(); }
+const reflected = const Reflected();
+
+class A {
+  int x = 1; // not annotated - reading this should give warnings.
+}
+
+@Reflected() // all symbols in this class are covered
+class B {
+  int y = 4;
+  int z = 5;
+}
+
+class C {
+  @reflected int y = 6;
+  int z = 7; // not covered
+}
+
+var a = new A();
+var b = new B();
+var c = new C();
+
+main() {
+  // This loads up the rules declared with @MirrorsUsed.
+  control.initialize(log: true);
+
+  // Print the warnings to the console.
+  Logger.root.onRecord.listen((r) => print(r));
+
+  var x = reflect(a).getField(#x).reflectee;
+  reflect(a).setField(#x, x + 1);
+
+  var by = reflect(b).getField(#y).reflectee;
+  reflect(b).setField(#y, by + 1);
+  var bz = reflect(b).getField(#z).reflectee;
+  reflect(b).setField(#y, bz + 1);
+
+  var cy = reflect(c).getField(#y).reflectee;
+  reflect(c).setField(#y, by + 1);
+  var cz = reflect(c).getField(#z).reflectee;
+  reflect(c).setField(#y, bz + 1);
+}