Johnni Winther
c6347389d2
This moves pattern variable assignments of fully matched expressions into the case body. This will help backends (dart2js in particular) to reason about the code flow. Closes #54115 Change-Id: I598a384a829f16e91ab2d6a309499cf20b9cc121 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/339122 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@google.com>
82 lines
1.5 KiB
Dart
82 lines
1.5 KiB
Dart
// Copyright (c) 2023, 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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abstract class A {
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B get b;
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int get i;
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}
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abstract class B {
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C get c;
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int get i;
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}
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abstract class C {
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int get i;
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}
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ifCase(o) {
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if (o case A a) {
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print(a);
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}
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if (o case A(:var b)) {
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print(b);
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}
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if (o case A(b: B(:var c))) {
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print(c);
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}
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if (o case A(b: B(c: C(:var i)))) {
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print(i);
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}
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if (o case A(:var b, :var i)) {
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print(b);
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print(i);
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}
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if (o case A(i: 5, :var b)) {
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print(b);
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}
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if (o case A(:var b, i: 5)) {
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print(b);
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}
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if (o case A(:var b, i: 5) && A(b: B(:var c, i: 7))) {
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print(b);
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print(c);
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}
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}
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switchExpression(o) => switch (o) {
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A a => a,
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A(:var b) => b,
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A(b: B(:var c)) => c,
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A(b: B(c: C(:var i))) => i,
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A(:var b, :var i) => '$b$i',
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A(i: 5, :var b) => b,
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A(:var b, i: 5) => b,
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A(:var b, i: 5) && A(b: B(:var c, i: 7)) => '$b$c',
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_ => null,
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};
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switchStatement(o) {
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dynamic v;
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switch (o) {
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case A a:
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v = a;
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case A(:var b):
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v = b;
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case A(b: B(:var c)):
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v = c;
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case A(b: B(c: C(:var i))):
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v = i;
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case A(:var b, :var i):
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v = '$b$i';
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case A(i: 5, :var b):
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v = b;
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case A(:var b, i: 5):
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v = b;
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case A(:var b, i: 5) && A(b: B(:var c, i: 7)):
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v = '$b$c';
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}
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return v;
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}
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