| // 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. |
| /// |
| /// 1. If [element] is an [if] element: |
| /// |
| /// i. Evaluate the condition expression to a value [condition]. |
| /// ii. Subject [condition] to boolean conversion to a value [result]. |
| /// iii. If [result] is [true]: |
| /// a. Evaluate the "then" element using this procedure. |
| /// iv. Else, if there is an "else" element of the [if]: |
| /// a. Evaluate the "else" element using this procedure. |
| /// . . . |
| /// @description Checks that if [element] of map literal is an [if] element, this |
| /// element is evaluated using the specified procedure. |
| /// @author ngl@unipro.ru |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| const t = false; |
| const int x = 1; |
| |
| var map1exp = <int, String>{}; |
| if (t) { |
| map1exp[x - 1] = "0"; |
| } else { |
| map1exp[x + 10] = "11"; |
| } |
| if (!t) { |
| map1exp[x - 1] = "0"; |
| } else { |
| map1exp[x + 10] = "11"; |
| } |
| Expect.isTrue(map1exp is Map<int, String>); |
| Expect.runtimeIsType<Map<int, String>>(map1exp); |
| |
| var map1 = <int, String>{ |
| if (t) x - 1: "0" else x + 10: "11", |
| if (!t) x - 1: "0" else x + 10: "11" |
| }; |
| // map1exp {11: 11, 0: 0} |
| Expect.mapEquals(map1exp, map1); |
| Expect.isTrue(map1 is Map<int, String>); |
| Expect.runtimeIsType<Map<int, String>>(map1); |
| |
| var map2exp = <int, String>{}; |
| if (t) { |
| map2exp[x - 1] = "0"; |
| } else { |
| map2exp[x + 10] = "11"; |
| } |
| if (!t) { |
| if (t) { |
| map2exp[x - 1] = "0"; |
| } else { |
| map2exp[x + 11] = "12"; |
| } |
| } else { |
| map2exp[x + 10] = "11"; |
| } |
| Expect.isTrue(map2exp is Map<int, String>); |
| Expect.runtimeIsType<Map<int, String>>(map2exp); |
| |
| var map2 = <int, String>{ |
| if (t) x - 1: "0" else x + 10: "11", |
| if (!t) if (t) x - 1: "0" else x + 11: "12" else x + 10: "11" |
| }; |
| // map2exp {11: 11, 12: 12} |
| Expect.mapEquals(map2exp, map2); |
| Expect.isTrue(map2 is Map<int, String>); |
| Expect.runtimeIsType<Map<int, String>>(map2); |
| |
| var map3exp = <int, String>{}; |
| if (t) { |
| map3exp[x - 1] = "0"; |
| } else { |
| if (!t) { |
| map3exp[x + 1] = "2"; |
| } else { |
| map3exp[x + 10] = "11"; |
| } |
| } |
| if (!t) { |
| map3exp[x - 1] = "0"; |
| } else { |
| map3exp[x + 10] = "11"; |
| } |
| Expect.isTrue(map3exp is Map<int, String>); |
| Expect.runtimeIsType<Map<int, String>>(map3exp); |
| |
| var map3 = <int, String>{ |
| if (t) x - 1: "0" else if (!t) x + 1: "2" else x + 10: "11", |
| if (!t) x - 1: "0" else x + 10: "11" |
| }; |
| // map3exp {2: 2, 0: 0} |
| Expect.mapEquals(map3exp, map3); |
| Expect.isTrue(map3 is Map<int, String>); |
| Expect.runtimeIsType<Map<int, String>>(map3); |
| } |