| // 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 We extend the list grammar to allow spread elements in addition to |
| /// regular elements: |
| /// listLiteral: |
| /// const? typeArguments? '[' spreadableList? ']' |
| /// ; |
| /// |
| /// spreadableList: |
| /// spreadableExpression ( ',' spreadableExpression )* ','? |
| /// ; |
| /// |
| /// spreadableExpression: |
| /// expression | |
| /// spread |
| /// ; |
| /// |
| /// spread: |
| /// ( '...' | '...?' ) expression |
| /// ; |
| /// |
| /// Instead of [expressionList], this uses a new [spreadableList] rule since |
| /// [expressionList] is used elsewhere in the grammar where spreads aren't |
| /// allowed. Each element in a list is either a normal expression or a spread |
| /// element. If the spread element starts with [...?], it's a null-aware spread |
| /// element. |
| /// @description Checks the very simple cases where some values are combined with |
| /// the existing list of different types |
| /// @author iarkh@unipro.ru |
| |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| List list1 = ["abc", "int", "hello"]; |
| List list2 = [14, 18, 99]; |
| List list3 = [0, 2, 4, 6, 8]; |
| |
| Expect.listEquals(["abc", "int", "hello", 12], [...list1, 12]); |
| Expect.listEquals([12, "abc", "int", "hello"], [12, ...list1]); |
| |
| Expect.listEquals(["abc", "int", "hello", 12, 2, 3, 10], |
| [...list1, 12, 2, 3, 10]); |
| |
| Expect.listEquals(["abc", "int", "hello", 14, 18, 99, 0, 2, 4, 6, 8], |
| [...list1, ...list2, ...list3]); |
| Expect.listEquals([11, "abc", "int", "hello", 12, 16, 94, 0, 2, 4, 6, 8], |
| [11, ...list1, 12, 16, 94, ...list3]); |
| } |