| // 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; } |
| } |
| |
| Set? getASet() => {1, 2, 3}; |
| List? getAList() => [0, 2, 4, 6, 8]; |
| Iterable? getIterable() => MyIterable(); |
| |
| main() { |
| Set set1 = {1, 2, 3}; |
| List list1 = [0, 2, 4, 6, 8]; |
| var map = null; |
| List? list2 = null; |
| Iterable i = 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, ...?getIterable()}; |
| 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 = |
| {...?getASet(), ...?getAList(), ...?list2, ...?map, ...?getIterable()}; |
| Expect.setEquals({1, 2, 3, 0, 4, 6, 8, 5, 7, 9}, res7); |
| } |