mirror of
https://github.com/dart-lang/sdk
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a5e18113f3
TEST= removed flags from test. No behavior should change. Change-Id: I401bfb68c082d1bd405a118d5eca6a47a807945f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/199241 Commit-Queue: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
77 lines
2.6 KiB
Dart
77 lines
2.6 KiB
Dart
// Copyright (c) 2021, 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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import "package:expect/expect.dart";
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class C {
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static int ctr = 0;
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final Object? _text;
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C([Object? text]) : _text = text ?? "${++ctr}";
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// It's possible to declare a `>>>` operator.
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C operator >>>(arg) => C("(${++ctr}:$_text>>>$arg)");
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// + binds more strongly than `>>`, `>>>` and `<<`.
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C operator +(arg) => C("(${++ctr}:$_text+$arg)");
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// Both `>>` and `<<` binds exactly as strongly as `>>>`.
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C operator >>(arg) => C("(${++ctr}:$_text>>$arg)");
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C operator <<(arg) => C("(${++ctr}:$_text<<$arg)");
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// & binds less strongly than `>>`, `>>>` and `<<`.
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C operator &(arg) => C("(${++ctr}:$_text&$arg)");
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String toString() => "${_text}";
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}
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class NSM {
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noSuchMethod(i) => i.memberName;
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}
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// Valid in extensions too.
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extension ShiftIt<T> on T {
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List<T> operator >>>(int count) => List<T>.filled(count, this);
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}
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main() {
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// It's possible to use the `>>>` operator.
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// Evaluation is left-to-right.
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Expect.equals("(3:1>>>2)", "${C() >>> C()}");
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var c = C();
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Expect.equals("4", "$c");
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c >>>= C();
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Expect.equals("(6:4>>>5)", "$c");
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// Precedence is as expected.
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// Different precedence than + (which binds stronger) and & (which doesn't).
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Expect.equals("(11:(9:7+8)>>>10)", "${C() + C() >>> C()}");
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Expect.equals("(16:12>>>(15:13+14))", "${C() >>> C() + C()}");
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Expect.equals("(23:(19:17+18)>>>(22:20+21))", "${C() + C() >>> C() + C()}");
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Expect.equals("(28:(26:24>>>25)&27)", "${C() >>> C() & C()}");
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Expect.equals("(33:29&(32:30>>>31))", "${C() & C() >>> C()}");
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Expect.equals("(40:(38:34&(37:35>>>36))&39)", "${C() & C() >>> C() & C()}");
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// Same precedence as `>>` and `<<`, left associative.
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Expect.equals("(45:(43:41>>>42)>>44)", "${C() >>> C() >> C()}");
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Expect.equals("(50:(48:46>>47)>>>49)", "${C() >> C() >>> C()}");
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Expect.equals("(55:(53:51>>>52)<<54)", "${C() >>> C() << C()}");
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Expect.equals("(60:(58:56<<57)>>>59)", "${C() << C() >>> C()}");
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Expect.equals("(67:(65:(63:61<<62)>>>64)>>66)",
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"${C() << C() >>> C() >> C()}");
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/// The `>>>` Symbol works.
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var literalSymbol = #>>>;
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var constSymbol = const Symbol(">>>");
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var newSymbol = new Symbol(">>>");
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Expect.identical(literalSymbol, constSymbol);
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Expect.equals(literalSymbol, newSymbol);
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dynamic n = NSM();
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var nsmSymbol = n >>> 42;
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Expect.equals(nsmSymbol, literalSymbol);
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var o = Object();
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Expect.listEquals([o, o, o, o, o], o >>> 5);
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}
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