Sigmund Cherem
a8db3278e2
This CL adds the implementation of all null-aware operators to dart2js. In particular: * a?.b: represented as 'isConditional' in the Send ast, and dispatched separately by the semantic visitor using visitIfNotNull* methods. * a ?? b: represented as an operator, and dispatched separately by the semantic visitor using the `visitIfNull` method. * a ??= b: represented as a compound operator. All except 2 tests are passing with the SSA backend (those 2 tests fail for unrelated reasons). I've marked the CPS ir tests as failing for now. BUG= R=johnniwinther@google.com, paulberry@google.com, sra@google.com Review URL: https://codereview.chromium.org//1151163004
62 lines
2.3 KiB
Dart
62 lines
2.3 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 when it is used to invoke a method.
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// SharedOptions=--enable-null-aware-operators
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import "package:expect/expect.dart";
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import "conditional_access_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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noMethod(e) => e is NoSuchMethodError;
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class B {}
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class C extends B {
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f(callback()) => callback();
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int g(int callback()) => callback();
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static void staticMethod() {}
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}
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C nullC() => null;
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main() {
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// Make sure the "none" test fails if method invocation using "?." is not
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// implemented. This makes status files easier to maintain.
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nullC()?.f(null);
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// o?.m(...) is equivalent to ((x) => x == null ? null : x.m(...))(o).
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Expect.equals(null, nullC()?.f(bad())); /// 01: ok
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Expect.equals(1, new C()?.f(() => 1)); /// 02: ok
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// The static type of o?.m(...) is the same as the static type of
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// o.m(...).
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{ int i = nullC()?.g(bad()); Expect.equals(null, i); } /// 03: ok
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{ int i = new C()?.g(() => 1); Expect.equals(1, i); } /// 04: ok
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{ String s = nullC()?.g(bad()); Expect.equals(null, s); } /// 05: static type warning
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{ String s = new C()?.g(() => null); Expect.equals(null, s); } /// 06: static type warning
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// Let T be the static type of o and let y be a fresh variable of type T.
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// Exactly the same static warnings that would be caused by y.m(...) are also
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// generated in the case of o?.m(...).
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{ B b = new C(); Expect.equals(1, b?.f(() => 1)); } /// 07: static type warning
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{ int i = 1; Expect.equals(null, nullC()?.f(i)); } /// 08: static type warning
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// Consequently, '?.' cannot be used to invoke static methods of classes.
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Expect.throws(() => C?.staticMethod(), noMethod); /// 09: static type warning
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Expect.throws(() => h.C?.staticMethod(), noMethod); /// 10: static type warning
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// Nor can it be used to access toplevel functions in libraries imported via
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// prefix.
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Expect.throws(() => h?.topLevelFunction(), noMethod); /// 11: static type warning
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// However, '?.' can be used to access the toString method on the class Type.
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Expect.equals(C?.toString(), (C).toString()); /// 12: ok
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Expect.equals(h.C?.toString(), (h.C).toString()); /// 13: ok
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}
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