| // 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: |
| /// |
| /// Lists |
| /// |
| /// 1. Create a fresh instance [collection] of a class that implements [List<E>]. |
| /// |
| /// An implementation is, of course, free to optimize by pre-allocating a list |
| /// of the correct capacity when its size is statically known. Note that when |
| /// [if] and [for] come into play, it's no longer always possible to |
| /// statically tell the final size of the resulting flattened list. |
| /// |
| /// 2. For each [element] in the list literal: |
| /// |
| /// i. Evaluate [element] using the procedure below. |
| /// |
| /// 3. The result of the literal expression is [collection]. |
| /// . . . |
| /// 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 list 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 list1exp = <int>[]; |
| if (t) { |
| list1exp.add(x); |
| } else { |
| list1exp.add(x + 10); |
| } |
| if (!t) { |
| list1exp.add(x); |
| } else { |
| list1exp.add(x + 10); |
| } |
| list1exp.add(2); |
| Expect.isTrue(list1exp is List<int>); |
| Expect.runtimeIsType<List<int>>(list1exp); |
| |
| var list1 = <int>[if (t) x else x + 10, if (!t) x else x + 10, 2]; |
| // list1exp [11, 1, 2] |
| Expect.listEquals(list1exp, list1); |
| Expect.isTrue(list1 is List<int>); |
| Expect.runtimeIsType<List<int>>(list1); |
| |
| var list2exp = <int>[]; |
| if (t) { |
| list2exp.add(x); |
| } else { |
| if (!t) { |
| list2exp.add(x); |
| } else { |
| list2exp.add(x + 10); |
| } |
| } |
| if (!t) { |
| list2exp.add(x); |
| } else { |
| list2exp.add(x + 10); |
| } |
| list2exp.add(2); |
| Expect.isTrue(list2exp is List<int>); |
| Expect.runtimeIsType<List<int>>(list2exp); |
| |
| var list2 = <int>[ |
| if (t) x else if (!t) x else x + 10, |
| if (!t) x else x + 10, 2 |
| ]; |
| // list2exp [1, 1, 2] |
| Expect.listEquals(list2exp, list2); |
| Expect.isTrue(list2 is List<int>); |
| Expect.runtimeIsType<List<int>>(list2); |
| |
| var list3exp = <int>[]; |
| if (t) { |
| list3exp.add(x); |
| } else { |
| list3exp.add(x + 10); |
| } |
| if (!t) { |
| if (t) { |
| list3exp.add(x); |
| } else { |
| list3exp.add(x + 10); |
| } |
| } else { |
| list3exp.add(x + 10); |
| } |
| list3exp.add(2); |
| Expect.isTrue(list3exp is List<int>); |
| |
| var list3 = [ |
| if (t) x else x + 10, |
| if (!t) if (t) x else x + 10 else x + 10, 2 |
| ]; |
| // list3exp [11, 11, 2] |
| Expect.listEquals(list3exp, list3); |
| Expect.isTrue(list3 is List<int>); |
| Expect.runtimeIsType<List<int>>(list3); |
| } |