Initial version of a serialization framework

pkg/serialization/lib/src/mirrors_helpers.dart

Index: pkg/serialization/lib/src/mirrors_helpers.dart
===================================================================
--- pkg/serialization/lib/src/mirrors_helpers.dart	(revision 0)
+++ pkg/serialization/lib/src/mirrors_helpers.dart	(revision 0)
@@ -0,0 +1,73 @@
+// 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.
+
+/**
+ * Provides some additional convenience methods on top of the basic mirrors
+ */
+library mirrors_helpers;
+
+// Import and re-export mirrors here to minimize both dependence on mirrors
+// and the number of times we have to be told that mirrors aren't finished yet.
+import 'dart:mirrors';
+export 'dart:mirrors';
+import 'serialization_helpers.dart';
+
+/**
+ * Return a list of all the public fields of a class, including inherited
+ * fields.
+ */
+List<VariableMirror> publicFields(ClassMirror mirror) {
+  var mine = mirror.variables.values.filter(
+      (x) => !(x.isPrivate || x.isStatic));
+  var mySuperclass = mirror.superclass;
+  if (mySuperclass != mirror) {
+    return append(publicFields(mirror.superclass), mine);
+  } else {
+    return mine;
+  }
+}
+
+/**
+ * Return a list of all the public getters of a class, including inherited
+ * getters.
+ */
+List<MethodMirror> publicGetters(ClassMirror mirror) {
+  var mine = mirror.getters.values.filter((x) => !(x.isPrivate || x.isStatic));
+  var mySuperclass = mirror.superclass;
+  if (mySuperclass != mirror) {
+    return append(publicGetters(mirror.superclass), mine);
+  } else {
+    return mine;
+  }
+}
+
+/**
+ * Return a list of all the public getters of a class which have corresponding
+ * setters.
+ */
+List<MethodMirror> publicGettersWithMatchingSetters(ClassMirror mirror) {
+  var setters = mirror.setters;
+  return publicGetters(mirror).filter((each) =>
+    setters["${each.simpleName}="] != null);
+}
+
+/**
+ * A particularly bad case of polyfill, because we cannot yet use type names
+ * as literals, so we have to be passed an instance and then extract a
+ * ClassMirror from that. Given a horrible name as an extra reminder to fix it.
+ */
+ClassMirror turnInstanceIntoSomethingWeCanUse(x) => reflect(x).type;
+
+/**
+ * This is polyfill because we can't hash ClassMirror right now. We
+ * don't bother implementing most of its methods because we don't need them.
+ */
+// TODO(alanknight): Remove this when you can hash mirrors directly
+class ClassMirrorWrapper implements ClassMirror {
+  ClassMirror mirror;
+  ClassMirrorWrapper(this.mirror);
+  get simpleName => mirror.simpleName;
+  get hashCode => simpleName.hashCode;
+  operator ==(x) => x is ClassMirror && simpleName == x.simpleName;
+}