Support optional (non-named) arguments in constructors for reflection.

tests/lib/mirrors/new_instance_optional_arguments_test.dart

+// Copyright (c) 2014, 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 mirror_test;
+
+@MirrorsUsed(targets: "mirror_test")
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+class A {
+  var req1, opt1, opt2;
+  A.a0([opt1]) : this.opt1 = opt1;
+  A.b0([opt1, opt2]) : this.opt1 = opt1, this.opt2 = opt2;
+  A.c0([opt1 = 499]) : this.opt1 = opt1;
+  A.d0([opt1 = 499, opt2 = 42]) : this.opt1 = opt1, this.opt2 = opt2;
+  A.a1(req1, [opt1]) : this.req1 = req1, this.opt1 = opt1;
+  A.b1(req1, [opt1, opt2])
+      : this.req1 = req1, this.opt1 = opt1, this.opt2 = opt2;
+  A.c1(req1, [opt1 = 499]) : this.req1 = req1, this.opt1 = opt1;
+  A.d1(req1, [opt1 = 499, opt2 = 42])
+      : this.req1 = req1, this.opt1 = opt1, this.opt2 = opt2;
+}
+
+main() {
+  ClassMirror cm = reflectClass(A);
+
+  var o;
+  o = cm.newInstance(#a0, []).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(null, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#b0, []).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(null, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#c0, []).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(499, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#d0, []).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(499, o.opt1);
+  Expect.equals(42, o.opt2);
+
+  o = cm.newInstance(#a0, [77]).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#b0, [77]).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#c0, [77]).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#d0, [77]).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(42, o.opt2);
+
+  o = cm.newInstance(#b0, [77, 11]).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(11, o.opt2);
+  o = cm.newInstance(#d0, [77, 11]).reflectee;
+  Expect.equals(null, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(11, o.opt2);
+
+  o = cm.newInstance(#a1, [123]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(null, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#b1, [123]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(null, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#c1, [123]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(499, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#d1, [123]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(499, o.opt1);
+  Expect.equals(42, o.opt2);
+
+  o = cm.newInstance(#a1, [123, 77]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#b1, [123, 77]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#c1, [123, 77]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(null, o.opt2);
+  o = cm.newInstance(#d1, [123, 77]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(42, o.opt2);
+
+  o = cm.newInstance(#b1, [123, 77, 11]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(11, o.opt2);
+  o = cm.newInstance(#d1, [123, 77, 11]).reflectee;
+  Expect.equals(123, o.req1);
+  Expect.equals(77, o.opt1);
+  Expect.equals(11, o.opt2);
+}