/*
 * Copyright (c) 2019, 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.
 */
/**
 * @assertion A null-shorting cascade expression e?..s translates as follows,
 * where x and y are fresh object level variables.
 *  fn[k : Exp -> Exp] : Exp =>
 *  let x = EXP(e) in x == null ? null : let y = EXP(x.s) in k(x)
 *
 * @description Check that a null-shorting cascade expression e?..s translates
 * as follows, where x and y are fresh object level variables.
 *  fn[k : Exp -> Exp] : Exp =>
 *  let x = EXP(e) in x == null ? null : let y = EXP(x.s) in k(x)
 * Test legacy pre-NNBD types
 * @author sgrekhov@unipro.ru
 */
// SharedOptions=--enable-experiment=non-nullable
// Requirements=nnbd-strong
import "../../Utils/expect.dart";
import "legacy_lib.dart";

main() {
  A a1 = new A();

  var actual1 = a1 ?.. test();
  var expected = a1;
  Expect.equals(expected, actual1);
  Expect.equals("test() called 1 times, text2 called 0 times", a1.log);

  var actual2 = a1 ?.. text2;
  Expect.equals(expected, actual2);
  Expect.equals("test() called 1 times, text2 called 1 times", a1.log);

  var actual3 = a1
      ?.. test()
      .. text2;
  Expect.equals(expected, actual3);
  Expect.equals("test() called 2 times, text2 called 2 times", a1.log);

  A? a2 = null;
  var actual4 = a2 ?.. test();
  Expect.isNull(actual4);

  var actual5 = a2 ?.. text2;
  Expect.isNull(actual5);

  var actual6 = a2
      ?.. test()
      .. text2;
  Expect.isNull(actual6);

  a2 = new A();
  var actual7 = a2 ?.. test();
  var expected2 = a2;
  Expect.equals(expected2, actual7);
  Expect.equals("test() called 1 times, text2 called 0 times", a2?.log);

  var actual8 = a2 ?.. text2;
  Expect.equals(expected2, actual8);
  Expect.equals("test() called 1 times, text2 called 1 times", a2?.log);

  var actual9 = a2
      ?.. test()
      .. text2;
  Expect.equals(expected2, actual9);
  Expect.equals("test() called 2 times, text2 called 2 times", a2?.log);

}