blob: b52eacd90959c6acff460f96c25d572833ea7678 [file] [log] [blame]
* 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.
* @assertionconst JsonEncoder.withIndent(
* String indent, [
* dynamic toEncodable(
* nonSerializable
* )
* ])
* Creates a JSON encoder that creates multi-line JSON.
* The encoding of elements of lists and maps are indented and put on separate
* lines. The indent string is prepended to these elements, once for each level
* of indentation.
* If indent is null, the output is encoded as a single line.
* 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 not null indent
* parameter and toEncodable creates a JSON encoder that creates multi-line
* @author
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.withIndent("--", toEncodable);
check(encoder, new A(), '"A encoded by toEncodable"');
check(encoder, new C(), '"C encoded by 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], "[\n--1,\n--2,\n--3\n]");
check(encoder, {"a": "b"}, '{\n--"a": "b"\n}');