| // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| // Verify semantics of the ?. operator when it does not appear on the LHS of an |
| // assignment. |
| |
| import "package:expect/expect.dart"; |
| import "conditional_access_helper.dart" as h; |
| |
| class B {} |
| |
| class C extends B { |
| int v; |
| C(this.v); |
| static int staticInt; |
| } |
| |
| C nullC() => null; |
| |
| main() { |
| // Make sure the "none" test fails if property access using "?." is not |
| // implemented. This makes status files easier to maintain. |
| nullC()?.v; |
| |
| // e1?.id is equivalent to ((x) => x == null ? null : x.id)(e1). |
| Expect.equals(null, nullC()?.v); |
| Expect.equals(1, new C(1)?.v); |
| |
| // C?.id is equivalent to C.id. |
| { C.staticInt = 1; Expect.equals(1, C?.staticInt); } |
| { h.C.staticInt = 1; Expect.equals(1, h.C?.staticInt); } |
| |
| // The static type of e1?.d is the static type of e1.id. |
| { int i = new C(1)?.v; Expect.equals(1, i); } |
| { String s = new C(null)?.v; Expect.equals(null, s); } |
| // ^^^^^^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT |
| // ^ |
| // [cfe] A value of type 'int' can't be assigned to a variable of type 'String'. |
| { C.staticInt = 1; int i = C?.staticInt; Expect.equals(1, i); } |
| { h.C.staticInt = 1; int i = h.C?.staticInt; Expect.equals(1, i); } |
| { C.staticInt = null; String s = C?.staticInt; Expect.equals(null, s); } |
| // ^^^^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT |
| // ^ |
| // [cfe] A value of type 'int' can't be assigned to a variable of type 'String'. |
| { h.C.staticInt = null; String s = h.C?.staticInt; Expect.equals(null, s); } |
| // ^^^^^^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT |
| // ^ |
| // [cfe] A value of type 'int' can't be assigned to a variable of type 'String'. |
| |
| // Let T be the static type of e1 and let y be a fresh variable of type T. |
| // Exactly the same static warnings that would be caused by y.id are also |
| // generated in the case of e1?.id. |
| Expect.equals(null, nullC()?.bad); |
| // ^^^ |
| // [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER |
| // [cfe] The getter 'bad' isn't defined for the class 'C'. |
| { B b = new C(1); Expect.equals(1, b?.v); } |
| // ^ |
| // [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER |
| // [cfe] The getter 'v' isn't defined for the class 'B'. |
| |
| // '?.' cannot be used to access toplevel properties in libraries imported via |
| // prefix. |
| var x = h?.topLevelVar; |
| // ^ |
| // [analyzer] COMPILE_TIME_ERROR.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT |
| // [cfe] A prefix can't be used with null-aware operators. |
| |
| // Nor can it be used to access the hashCode getter on the class Type. |
| Expect.throwsNoSuchMethodError(() => C?.hashCode); |
| // ^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER |
| // [cfe] Getter not found: 'hashCode'. |
| Expect.throwsNoSuchMethodError(() => h.C?.hashCode); |
| // ^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.UNDEFINED_GETTER |
| // [cfe] Getter not found: 'hashCode'. |
| } |