mirror of
https://github.com/dart-lang/sdk
synced 2024-09-18 21:51:18 +00:00
07b9df22ac
No behavioral changes, just getting rid of a lot of redundant closures and helper functions. Change-Id: I55c52c2cc9e5505bb64203c31aad8d76847f8eeb Reviewed-on: https://dart-review.googlesource.com/14320 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: William Hesse <whesse@google.com>
207 lines
6 KiB
Dart
207 lines
6 KiB
Dart
// 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 "if_null_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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vGetValue = 1; check(1, () => v ??= bad(), ['$s.v']); //# 01: ok
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yGetValue = 1; check(1, () => v ??= y, ['$s.v', 'y', '$s.v=1']); //# 02: ok
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finalOne ??= null; //# 03: compile-time error
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yGetValue = 1;
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}
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}
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class D extends C {
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D(String s) : super(s);
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get v => bad();
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void set v(value) {
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bad();
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}
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void derivedInstanceTest() {
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// super.v ??= e is equivalent to
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// ((x) => x == null ? super.v = e : x)(super.v)
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vGetValue = 1; check(1, () => super.v ??= bad(), ['$s.v']); //# 05: ok
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yGetValue = 1; check(1, () => super.v ??= y, ['$s.v', 'y', '$s.v=1']); //# 06: ok
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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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xGetValue = 1; check(1, () => x ??= bad(), ['x']); //# 07: ok
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yGetValue = 1; check(1, () => x ??= y, ['x', 'y', 'x=1']); //# 08: ok
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h.xGetValue = 1; check(1, () => h.x ??= bad(), ['h.x']); //# 09: ok
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yGetValue = 1; check(1, () => h.x ??= y, ['h.x', 'y', 'h.x=1']); //# 10: ok
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{ var l = 1; check(1, () => l ??= bad(), []); } //# 11: ok
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{ var l; yGetValue = 1; check(1, () => l ??= y, ['y']); Expect.equals(1, l); } //# 12: ok
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{ final l = 1; l ??= null; } //# 13: compile-time error
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C ??= null; //# 15: compile-time error
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h ??= null; //# 29: compile-time error
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h[0] ??= null; //# 30: compile-time error
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// C.v ??= e is equivalent to ((x) => x == null ? C.v = e : x)(C.v)
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C.xGetValue = 1; check(1, () => C.x ??= bad(), ['C.x']); //# 16: ok
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yGetValue = 1; check(1, () => C.x ??= y, ['C.x', 'y', 'C.x=1']); //# 17: ok
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h.C.xGetValue = 1; check(1, () => h.C.x ??= bad(), ['h.C.x']); //# 18: ok
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yGetValue = 1; check(1, () => h.C.x ??= y, ['h.C.x', 'y', 'h.C.x=1']); //# 19: ok
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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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xGetValue = new C('x'); xGetValue.vGetValue = 1; //# 20: ok
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check(1, () => x.v ??= bad(), ['x', 'x.v']); // //# 20: continued
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xGetValue = new C('x'); yGetValue = 1; // //# 21: ok
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check(1, () => x.v ??= y, ['x', 'x.v', 'y', 'x.v=1']); //# 21: continued
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fValue = new C('f()'); fValue.vGetValue = 1; // //# 22: ok
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check(1, () => f().v ??= bad(), ['f()', 'f().v']); //# 22: continued
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fValue = new C('f()'); yGetValue = 1; // //# 23: ok
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check(1, () => f().v ??= y, ['f()', 'f().v', 'y', 'f().v=1']); //# 23: continued
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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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xGetValue = new C('x'); yGetValue = 1; xGetValue.indexGetValue = 2; //# 24: ok
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check(2, () => x[y] ??= bad(), ['x', 'y', 'x[1]']); // //# 24: continued
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xGetValue = new C('x'); yGetValue = 1; zGetValue = 2; // //# 25: ok
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check(2, () => x[y] ??= z, ['x', 'y', 'x[1]', 'z', 'x[1]=2']); //# 25: continued
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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']); //# 26: ok
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xGetValue = new C('x'); xGetValue.vGetValue = 1; //# 27: ok
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check(1, () => x?.v ??= bad(), ['x', 'x.v']); // //# 27: continued
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xGetValue = new C('x'); yGetValue = 1; // //# 28: ok
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check(1, () => x?.v ??= y, ['x', 'x.v', 'y', 'x.v=1']); //# 28: continued
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// C?.v ??= e2 is equivalent to C.v ??= e2.
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C.xGetValue = 1; // //# 29: ok
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check(1, () => C?.x ??= bad(), ['C.x']); //# 29: continued
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h.C.xgetValue = 1; // //# 30: ok
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check(1, () => h.c?.x ??= bad(), ['h.C.x']); //# 30: continued
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yGetValue = 1; // //# 31: ok
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check(1, () => C?.x ??= y, ['C.x', 'y', 'C.x=1']); //# 31: continued
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yGetValue = 1; // //# 32: ok
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check(1, () => h.C?.x ??= y, ['h.C.x', 'y', 'h.C.x=1']); //# 32: continued
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}
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