| // 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 JsonUtf8Encoder([ |
| /// String indent, |
| /// dynamic toEncodable( |
| /// object |
| /// ), |
| /// int bufferSize = DEFAULT_BUFFER_SIZE |
| /// ]) |
| /// Create converter. |
| /// |
| /// If indent is non-null, the converter attempts to "pretty-print" the JSON, |
| /// and uses indent as the indentation. Otherwise the result has no whitespace |
| /// outside of string literals. If indent contains characters that are not valid |
| /// JSON whitespace characters, the result will not be valid JSON. JSON |
| /// whitespace characters are space (U+0020), tab (U+0009), line feed (U+000a) |
| /// and carriage return (U+000d) (ECMA 404). |
| /// |
| /// The bufferSize is the size of the internal buffers used to collect UTF-8 code |
| /// units. If using startChunkedConversion, it will be the size of the chunks. |
| /// |
| /// 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. |
| /// |
| /// If toEncodable is omitted, it defaults to calling .toJson() on the object. |
| /// @description Checks that this constructor, called with toEncodable parameter, |
| /// creates object with specified toEncodable |
| /// @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(JsonUtf8Encoder encoder, var object, var expected) { |
| List<int> encoded = encoder.convert(object); |
| Expect.listEquals(utf8.encode(expected), encoded); |
| } |
| |
| main() { |
| JsonUtf8Encoder encoder = new JsonUtf8Encoder(null, 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, {" й ": " ф "}, '{" й ":" ф "}'); |
| |
| 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"}'); |
| } |