| /* |
| * 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 Dynamic Semantics |
| * The new dynamic semantics are a superset of the original behavior. To avoid |
| * redundancy and handle nested uses, the semantics are expressed in terms of a |
| * separate procedure below: |
| * . . . |
| * Maps |
| * A map literal of the form [<K, V>{entry_1 ... entry_n}] is evaluated as |
| * follows: |
| * 1. Allocate a fresh instance [map] of a class that implements |
| * [LinkedHashMap<K, V>]. |
| * |
| * 2. For each [element] in the map literal: |
| * i. Evaluate [element] using the procedure below. |
| * |
| * 3. The result of the map literal expression is [map]. |
| * . . . |
| * To evaluate a collection [element]: |
| * This procedure handles elements in both list and map literals because the |
| * only difference is how a base expression element or entry element is handled. |
| * The control flow parts are the same so are unified here. |
| * |
| * 2. Else, if [element] is a synchronous [for-in] element: |
| * |
| * i. Evaluate the iterator expression to a value [sequence]. |
| * ii. Evaluate [sequence.iterator] to a value [iterator]. |
| * iii. Loop: |
| * a. If the boolean conversion of [iterator.moveNext()] does not |
| * return [true], exit the loop. |
| * b. If the [for-in] element declares a variable, create a fresh |
| * [variable] for it. Otherwise, use the existing [variable] it |
| * refers to. |
| * c. Evaluate [iterator.current] and bind it to [variable]. |
| * d. Evaluate the body element using this procedure in the scope of |
| * [variable]. |
| * iv. If the [for-in] element declares a variable, discard it. |
| * . . . |
| * @description Checks that if [element] of map literal is a synchronous |
| * [for-in] element, this element is evaluated using the specified procedure. |
| * @author ngl@unipro.ru |
| */ |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| var list1 = [1, 2]; |
| var list2 = [3, 4, 5]; |
| |
| var map1exp = <int, int>{}; |
| var n0 = list2.iterator; |
| while (n0.moveNext()) { |
| var id = n0.current; |
| map1exp[id] = id + 10; |
| } |
| n0 = list1.iterator; |
| while (n0.moveNext()) { |
| var id = n0.current; |
| map1exp[id] = id + 20; |
| } |
| Expect.isTrue(map1exp is Map<int, int>); |
| |
| var map1 = <int, int>{ |
| for (var v in list2) v: v + 10, |
| for (var v in list1) v: v + 20 |
| }; |
| // map1exp {3: 13, 4: 14, 5: 15, 1: 21, 2: 22} |
| Expect.isTrue(map1 is Map<int, int>); |
| Expect.mapEquals(map1exp, map1); |
| } |