mirror of
https://github.com/dart-lang/sdk
synced 2024-09-18 21:01:20 +00:00
02b50e4079
Change-Id: Idf369ab6b6ff6784719924fdcc7c586001a285e4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148204 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
210 lines
3.2 KiB
Dart
210 lines
3.2 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
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// contain strange or dead code.
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// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Verify semantics of the ??= operator, including order of operations, by
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// keeping track of the operations performed.
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import "package:expect/expect.dart";
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import "assignment_helper.dart" as h;
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bad() {
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Expect.fail('Should not be executed');
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}
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var xGetValue = null;
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get x {
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h.operations.add('x');
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var tmp = xGetValue;
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xGetValue = null;
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return tmp;
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}
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void set x(value) {
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h.operations.add('x=$value');
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}
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var yGetValue = null;
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get y {
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h.operations.add('y');
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var tmp = yGetValue;
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yGetValue = null;
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return tmp;
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}
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void set y(value) {
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h.operations.add('y=$value');
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}
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var zGetValue = null;
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get z {
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h.operations.add('z');
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var tmp = zGetValue;
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zGetValue = null;
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return tmp;
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}
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void set z(value) {
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h.operations.add('z=$value');
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}
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var fValue = null;
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f() {
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h.operations.add('f()');
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var tmp = fValue;
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fValue = null;
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return tmp;
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}
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void check(expectedValue, f(), expectedOperations) {
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Expect.equals(expectedValue, f());
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Expect.listEquals(expectedOperations, h.operations);
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h.operations = [];
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}
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class C {
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final String s;
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C(this.s);
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@override
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String toString() => s;
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static var xGetValue = null;
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static get x {
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h.operations.add('C.x');
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var tmp = xGetValue;
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xGetValue = null;
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return tmp;
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}
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static void set x(value) {
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h.operations.add('C.x=$value');
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}
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var vGetValue = null;
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get v {
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h.operations.add('$s.v');
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var tmp = vGetValue;
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vGetValue = null;
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return tmp;
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}
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void set v(value) {
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h.operations.add('$s.v=$value');
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}
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var indexGetValue = null;
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operator [](index) {
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h.operations.add('$s[$index]');
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var tmp = indexGetValue;
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indexGetValue = null;
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return tmp;
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}
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void operator []=(index, value) {
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h.operations.add('$s[$index]=$value');
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}
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final finalOne = 1;
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final finalNull = null;
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void instanceTest() {
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// v ??= e is equivalent to ((x) => x == null ? v = e : x)(v)
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yGetValue = 1;
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}
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}
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class D extends C {
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D(String s) : super(s);
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get v => bad();
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void set v(value) {
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bad();
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}
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void derivedInstanceTest() {
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// super.v ??= e is equivalent to
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// ((x) => x == null ? super.v = e : x)(super.v)
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}
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}
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main() {
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// Make sure the "none" test fails if "??=" is not implemented. This makes
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// status files easier to maintain.
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var _;
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_ ??= null;
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new C('c').instanceTest();
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new D('d').derivedInstanceTest();
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// v ??= e is equivalent to ((x) => x == null ? v = e : x)(v)
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// C.v ??= e is equivalent to ((x) => x == null ? C.v = e : x)(C.v)
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// e1.v ??= e2 is equivalent to
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// ((x) => ((y) => y == null ? x.v = e2 : y)(x.v))(e1)
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// e1[e2] ??= e3 is equivalent to
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// ((a, i) => ((x) => x == null ? a[i] = e3 : x)(a[i]))(e1, e2)
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// e1?.v ??= e2 is equivalent to ((x) => x == null ? null : x.v ??= e2)(e1).
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check(null, () => x?.v ??= bad(), ['x']);
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// C?.v ??= e2 is equivalent to C.v ??= e2.
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}
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