Add support for the node net module.

frog/lib/node/repl.dart

Index: frog/lib/node/repl.dart
===================================================================
--- frog/lib/node/repl.dart	(revision 0)
+++ frog/lib/node/repl.dart	(revision 0)
@@ -0,0 +1,30 @@
+// Copyright (c) 2011, 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.
+
+#library('repl');
+#import('node.dart');
+
+typedef void ReplEvalCallback(var ignore, var result);
+typedef void ReplEvalFunction(String cmd, ReplEvalCallback callback);
+
+class repl native "require('repl')" {
+  static REPLServer start([String prompt, ReadWriteStream stream,
+    ReplEvalFunction evalFn, bool useGlobal, bool ignoreUndefined]) native;
+  static REPLServer startStdio([String prompt, ReplEvalFunction evalFn,
+    bool useGlobal, bool ignoreUndefined])
+    native "return this.start(prompt, evalFn, useGlobal, ignoreUndefined);";
+  static bool disableColors;
+}
+
+class REPLServer native 'repl.REPLServer'{
+  REPLServerMap get context() => new REPLServerMap(this);
+}
+
+class REPLServerMap {
+  REPLServer _server;
+  const REPLServerMap(this._server);
+  void operator[]=(String key, var value) native
+      "this._server.context[key] = value;";
+  var operator[](String key) native "return this._server.context[key];";
+}