Terry Lucas
960fff771d
R=bkonyi@google.com Change-Id: I1f2769da1511570fa55e883a2997b8ceb4932217 Reviewed-on: https://dart-review.googlesource.com/11362 Commit-Queue: Terry Lucas <terry@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
64 lines
1.6 KiB
Dart
64 lines
1.6 KiB
Dart
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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@JS()
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library js_extend_class_test;
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import 'dart:html';
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import 'package:js/js.dart';
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import 'package:js/js_util.dart' as js_util;
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import 'package:expect/minitest.dart';
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@JS('Date')
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class JSDate {
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external get jsField;
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external get jsMethod;
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}
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@JS('Date.prototype.jsField')
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external set datePrototypeJSField(v);
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@JS('Date.prototype.jsMethod')
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external set datePrototypeJSMethod(v);
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// Extending a JS class with a Dart class is only supported by DDC for now.
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// We extend the Date class instead of a user defined JS class to avoid the
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// hassle of ensuring the JS class exists before we use it.
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class DartJsDate extends JSDate {
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get dartField => 100;
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int dartMethod(x) {
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return x * 2;
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}
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}
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main() {
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// Monkey-patch the JS Date class.
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datePrototypeJSField = 42;
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datePrototypeJSMethod = allowInterop((x) => x * 10);
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group('extend js class', () {
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test('js class members', () {
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var bar = new DartJsDate();
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expect(bar.jsField, equals(42));
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expect(bar.jsMethod(5), equals(50));
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expect(bar.dartField, equals(100));
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expect(bar.dartMethod(4), equals(8));
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});
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test('instance checks and casts', () {
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var bar = new DartJsDate();
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expect(bar is JSDate, isTrue);
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expect(bar as JSDate, equals(bar));
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});
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test('dart subclass members', () {
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var bar = new DartJsDate();
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expect(bar.dartField, equals(100));
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expect(bar.dartMethod(4), equals(8));
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});
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});
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}
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