| // Copyright (c) 2017, 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. |
| |
| /// @assertion const JsonEncoder([Object toEncodable(Object nonSerializable)]) |
| /// Creates a JSON encoder. |
| /// The JSON encoder handles numbers, strings, booleans, null, lists and maps |
| /// directly. |
| /// Any other object is attempted converted by toEncodable to an object that is |
| /// of one of the convertible types. |
| /// @description Checks that this constructor, called with toEncodable parameter, |
| /// handles numbers, strings, booleans, null, lists and maps |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:convert"; |
| import "../../../Utils/expect.dart"; |
| |
| class A { |
| Object toJson() => 42; |
| } |
| |
| class C { |
| String toJson() => "C: this is JSON"; |
| } |
| |
| dynamic toEncodable(object) { |
| if (object is A) { |
| return "A encoded by toEncodable"; |
| } |
| if (object is C) { |
| return "C encoded by toEncodable"; |
| } |
| return "Another encoded by toEncodable"; |
| } |
| |
| check(JsonEncoder encoder, var object, var expected) { |
| String encoded = encoder.convert(object); |
| Expect.equals(expected, encoded); |
| } |
| |
| main() { |
| JsonEncoder encoder = new JsonEncoder(toEncodable); |
| |
| check(encoder, 1, "1"); |
| check(encoder, 3.14, "3.14"); |
| check(encoder, null, "null"); |
| check(encoder, "str", '"str"'); |
| check(encoder, true, 'true'); |
| check(encoder, false, 'false'); |
| check(encoder, [1, 2, 3], "[1,2,3]"); |
| check(encoder, {"a": "b"}, '{"a":"b"}'); |
| check(encoder, new A(), '"A encoded by toEncodable"'); |
| check(encoder, new C(), '"C encoded by toEncodable"'); |
| check(encoder, [new C(), new A()], |
| '["C encoded by toEncodable","A encoded by toEncodable"]'); |
| // Map with not a string keys |
| check( |
| encoder, {new C(): new A()}, '"Another encoded by toEncodable"'); |
| |
| // Map with a string keys |
| check(encoder, {"x": new A()}, '{"x":"A encoded by toEncodable"}'); |
| } |