| /* |
| * Copyright (c) 2019, 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 An expression like: |
| * { ...a, ...b } |
| * Is syntactically parsed as [mapOrSetLiteral]. To determine whether it |
| * actually is a map or set, the surrounding context is used. Given an |
| * [mapOrSetLiteral] with context type [C]: |
| * |
| * If [Set<Null>] is assignable to [C], and [Map<Null, Null>] is not |
| * assignable to [C], then the collection is a set literal. |
| * |
| * Otherwise, it is a map literal. |
| * |
| * In other words, if it can only be a set, it is. Otherwise, it's a map. |
| * @description Checks that if [a] and [b] are set literals (probably, |
| * null-aware), their spread is a set. |
| * @author iarkh@unipro.ru |
| */ |
| |
| import "../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| class MyIterable extends IterableBase { |
| MyIterable(); |
| Iterator get iterator => MyIterator(); |
| } |
| |
| class MyIterator extends Iterator { |
| int i = -1; |
| MyIterator() {} |
| @override |
| bool moveNext() { return ++i < 10; } |
| @override |
| dynamic get current { return i; } |
| } |
| |
| main() { |
| var set1 = {1, 2, 3}; |
| var list1 = [0, 2, 4, 6, 8]; |
| var map = null; |
| List list2 = null; |
| Iterable i = new MyIterable(); |
| |
| Set res1 = {...set1, ...?list2}; |
| Expect.setEquals(set1, res1); |
| |
| Set res2 = {...?list2, ...list1}; |
| Expect.setEquals(list1.toSet(), res2); |
| |
| Set res3 = {...?map, ...list1}; |
| Expect.setEquals(list1.toSet(), res3); |
| |
| Set res4 = {...?list2, ...?i}; |
| Expect.setEquals(i.toSet(), res4); |
| |
| Set res5 = {...i, ...?map}; |
| Expect.setEquals(i.toSet(), res5); |
| |
| Set res6 = {...set1, ...list1, ...?list2, ...?map, ...i}; |
| Expect.setEquals({1, 2, 3, 0, 4, 6, 8, 5, 7, 9}, res6); |
| |
| Set res7 = {...?set1, ...?list1, ...?list2, ...?map, ...?i}; |
| Expect.setEquals({1, 2, 3, 0, 4, 6, 8, 5, 7, 9}, res7); |
| } |