Implement newInstance in the transformer.

test_reflectable/test/new_instance_test.dart

+// Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+// File being transformed by the reflectable transformer.
+// Uses `invoke`.
+
+library reflectable.test.to_be_transformed.new_instance_default_values_test;
+
+import 'package:reflectable/reflectable.dart';
+import 'package:unittest/unittest.dart';
+
+class MyReflectable extends Reflectable {
+  const MyReflectable() : super(newInstanceCapability);
+}
+
+const myReflectable = const MyReflectable();
+
+@myReflectable
+class A {
+  A() : f = 42;
+  A.positional(int x) : f = x - 42;
+  A.optional(int x, int y, [int z = 1, w])
+      : f = x + y + z * 42 + (w == null ? 10 : w);
+  A.argNamed(int x, int y, {int z: 42, int p})
+      : f = x + y - z - (p == null ? 10 : p);
+  int f = 0;
+}
+
+main() {
+  ClassMirror classMirror = myReflectable.reflectType(A);
+  test('newInstance unnamed constructor, no arguments', () {
+    expect((classMirror.newInstance("", []) as A).f, 42);
+  });
+  test('newInstance named constructor, simple argument list, one argument', () {
+    expect((classMirror.newInstance("positional", [84]) as A).f, 42);
+  });
+  test('newInstance optional arguments, all used', () {
+    expect((classMirror.newInstance("optional", [1, 2, 3, 4]) as A).f, 133);
+  });
+  test('newInstance optional arguments, none used', () {
+    expect((classMirror.newInstance("optional", [1, 2]) as A).f, 55);
+  });
+  test('newInstance optional arguments, some used', () {
+    expect((classMirror.newInstance("optional", [1, 2, 3]) as A).f, 139);
+  });
+  test('newInstance named arguments, all used', () {
+    expect((classMirror.newInstance("argNamed", [1, 2], {#z: 3, #p: 0}) as A).f,
+        0);
+  });
+  test('newInstance named arguments, some used', () {
+    expect((classMirror.newInstance("argNamed", [1, 2], {#z: 3}) as A).f, -10);
+    expect((classMirror.newInstance("argNamed", [1, 2], {#p: 3}) as A).f, -42);
+  });
+  test('newInstance named arguments, unused', () {
+    expect((classMirror.newInstance("argNamed", [1, 2]) as A).f, -49);
+    expect((classMirror.newInstance("argNamed", [1, 2], {}) as A).f, -49);
+  });
+}