| // 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 that [spreadableList] can be constant |
| /// @author iarkh@unipro.ru |
| |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| const List list1 = ["abc", "int", "hello"]; |
| const List list2 = [1, 2, 12]; |
| const List list3 = ["test"]; |
| |
| List a = const [...list1]; |
| Expect.listEquals(["abc", "int", "hello"], a); |
| |
| a = const ["testme", ...list1]; |
| Expect.listEquals(["testme", "abc", "int", "hello"], a); |
| |
| a = const [...list1, "testme"]; |
| Expect.listEquals(["abc", "int", "hello", "testme"], a); |
| |
| a = const [...list1, ...list2, ...list3]; |
| Expect.listEquals(["abc", "int", "hello", 1, 2, 12, "test"], a); |
| } |