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>
66 lines
1.5 KiB
Dart
66 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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// Derived from co19/src/LanguageFeatures/Patterns/invocation_keys_A04_t03.dart
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import 'dart:collection';
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class MyList<E> with ListMixin<E> {
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final List<E> list;
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StringBuffer sb = new StringBuffer();
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MyList(this.list);
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E operator [](int index) {
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sb.write('[$index];');
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return list[index];
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}
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void operator []=(int index, E value) {
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list[index] = value;
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}
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int get length => list.length;
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void set length(int value) {
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list.length = value;
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}
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String get log => sb.toString();
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void clearLog() {
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sb.clear();
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}
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}
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String test1(Object o) =>
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switch (o) { [var x, 2, var y] => "match-1", _ => "no match" };
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String test2(Object o) =>
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switch (o) { [1, var x, var y] => "match-1", _ => "no match" };
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String test3(Object o) => switch (o) {
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[var x!, 1] => "match-1",
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[1, var x!] => "match-2",
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_ => "no match"
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};
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main() {
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final ml1 = MyList<int>([1, 2, 3]);
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expect("match-1", test1(ml1));
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expect("[0];[1];[2];", ml1.log);
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final ml2 = MyList<int>([1, 2, 3]);
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expect("match-1", test2(ml2));
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expect("[0];[1];[2];", ml2.log);
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final ml3 = MyList<int>([1, 2]);
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expect("match-2", test3(ml3));
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expect("[0];[1];", ml3.log);
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}
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expect(expected, actual) {
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if (expected != actual) throw 'Expected $expected, actual $actual';
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}
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