Paul Berry
0e98c58190
Previously, trying to access a static member of a class using '?.' was
not allowed. But the spec was changed in
b11670f899 so that
'ClassName?.staticMember' is now equivalent to
'ClassName.staticMember'.
This CL updates analyzer to follow the spec, and updates the tests in
"tests/language" accordingly. VM and dart2js still need fixing
(see #23794 and #23795).
Fixes #23464.
R=scheglov@google.com
Review URL: https://codereview.chromium.org//1255293005 .
65 lines
2.6 KiB
Dart
65 lines
2.6 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 when it is used to invoke a method.
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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 staticF(callback()) => callback();
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static int staticG(int callback()) => callback();
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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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// C?.m(...) is equivalent to C.m(...).
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Expect.equals(1, C?.staticF(() => 1)); /// 14: ok
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Expect.equals(1, h.C?.staticF(() => 1)); /// 15: 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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{ int i = C?.staticG(() => 1); Expect.equals(1, i); } /// 16: ok
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{ int i = h.C?.staticG(() => 1); Expect.equals(1, i); } /// 17: ok
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{ String s = C?.staticG(() => null); Expect.equals(null, s); } /// 18: static type warning
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{ String s = h.C?.staticG(() => null); Expect.equals(null, s); } /// 19: 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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// '?.' can't be used to access toplevel functions in libraries imported via
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// prefix.
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h?.topLevelFunction(); /// 11: compile-time error
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// Nor can it be used to access the toString method on the class Type.
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Expect.throws(() => C?.toString(), noMethod); /// 12: static type warning
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Expect.throws(() => h.C?.toString(), noMethod); /// 13: static type warning
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}
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