Revert "remove serialization. it's moved to github"

pkg/serialization/lib/src/mirrors_helpers.dart

+// 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';
+
+// TODO(alanknight): Remove this method.  It is working around a bug
+// in the Dart VM which incorrectly returns Object as the superclass
+// of Object.
+_getSuperclass(ClassMirror mirror) {
+  var superclass = mirror.superclass;
+  return (superclass == mirror) ? null : superclass;
+}
+
+/**
+ * Return a list of all the public fields of a class, including inherited
+ * fields.
+ */
+Iterable<VariableMirror> publicFields(ClassMirror mirror) {
+  var mine = mirror.declarations.values.where(
+      (x) => x is VariableMirror && !(x.isPrivate || x.isStatic));
+  var mySuperclass = _getSuperclass(mirror);
+  if (mySuperclass != null) {
+    return append(publicFields(mySuperclass), mine);
+  } else {
+    return new List<VariableMirror>.from(mine);
+  }
+}
+
+/** Return true if the class has a field named [name]. Note that this
+ * includes private fields, but excludes statics. */
+bool hasField(Symbol name, ClassMirror mirror) {
+  if (name == null) return false;
+  var field = mirror.declarations[name];
+  if (field is VariableMirror && !field.isStatic) return true;
+  var superclass = _getSuperclass(mirror);
+  if (superclass == null) return false;
+  return hasField(name, superclass);
+}
+
+/**
+ * Return a list of all the getters of a class, including inherited
+ * getters. Note that this allows private getters, but excludes statics.
+ */
+Iterable<MethodMirror> publicGetters(ClassMirror mirror) {
+  var mine = mirror.declarations.values.where(
+      (x) => x is MethodMirror && x.isGetter && !(x.isPrivate || x.isStatic));
+  var mySuperclass = _getSuperclass(mirror);
+  if (mySuperclass != null) {
+    return append(publicGetters(mySuperclass), mine);
+  } else {
+    return new List<MethodMirror>.from(mine);
+  }
+}
+
+/** Return true if the class has a getter named [name] */
+bool hasGetter(Symbol name, ClassMirror mirror) {
+  if (name == null) return false;
+  var getter = mirror.declarations[name];
+  if (getter is MethodMirror && getter.isGetter && !getter.isStatic) {
+    return true;
+  }
+  var superclass = _getSuperclass(mirror);
+  if (superclass == null) return false;
+  return hasField(name, superclass);
+}
+
+/**
+ * Return a list of all the public getters of a class which have corresponding
+ * setters.
+ */
+Iterable<MethodMirror> publicGettersWithMatchingSetters(ClassMirror mirror) {
+  var declarations = mirror.declarations;
+  return publicGetters(mirror).where((each) =>
+    // TODO(alanknight): Use new Symbol here?
+    declarations["${each.simpleName}="] != null);
+}
+
+/**
+ * Given either an instance or a type, returns the type. Instances of Type
+ * will be treated as types. Passing in an instance is really just backward
+ * compatibility.
+ */
+ClassMirror turnInstanceIntoSomethingWeCanUse(x) {
+  if (x is Type) return reflectClass(x);
+  return reflect(x).type;
+}