jdk-24/test/langtools/tools/javac/switchexpr/ExpressionSwitchEmbedding.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 * questions.
 */

/*
 * @test
 * @bug 8214031
 * @summary Verify switch expressions embedded in various statements work properly.
 * @compile --enable-preview -source 12 ExpressionSwitchEmbedding.java
 * @run main/othervm --enable-preview ExpressionSwitchEmbedding
 */

public class ExpressionSwitchEmbedding {
    public static void main(String... args) {
        new ExpressionSwitchEmbedding().run();
    }

    private void run() {
        {
            int i = 6;
            int o = 0;
            while (switch (i) {
                case 1: i = 0; break true;
                case 2: i = 1; break true;
                case 3, 4: i--;
                    if (i == 2 || i == 4) {
                        break switch (i) {
                            case 2 -> true;
                            case 4 -> false;
                            default -> throw new IllegalStateException();
                        };
                    } else {
                        break true;
                    }
                default: i--; break switch (i) {
                    case -1 -> false;
                    case 3 -> true;
                    default -> true;
                };
            }) {
                o++;
            }
            if (o != 6 && i >= 0) {
                throw new IllegalStateException();
            }
        }
        {
            int i = 6;
            int o = 0;
            if (switch (i) {
                case 1: i = 0; break true;
                case 2: i = 1; break true;
                case 3, 4: i--;
                    if (i == 2 || i == 4) {
                        break (switch (i) {
                            case 2 -> 3;
                            case 4 -> 5;
                            default -> throw new IllegalStateException();
                        }) == i + 1;
                    } else {
                        break true;
                    }
                default: i--; break switch (i) {
                    case -1 -> false;
                    case 3 -> true;
                    default -> true;
                };
            }) {
                o++;
            }
            if (o != 1 && i != 5) {
                throw new IllegalStateException();
            }
        }
        {
            int o = 0;
            for (int i = 6; (switch (i) {
                case 1: i = 0; break true;
                case 2: i = 1; break true;
                case 3, 4: i--;
                    if (i == 2 || i == 4) {
                        break switch (i) {
                            case 2 -> true;
                            case 4 -> false;
                            default -> throw new IllegalStateException();
                        };
                    } else {
                        break true;
                    }
                default: i--; break switch (i) {
                    case -1 -> false;
                    case 3 -> true;
                    default -> true;
                };
            }); ) {
                o++;
            }
            if (o != 6) {
                throw new IllegalStateException();
            }
        }
        {
            int i = 6;
            int o = 0;
            do {
                o++;
            } while (switch (i) {
                case 1: i = 0; break true;
                case 2: i = 1; break true;
                case 3, 4: i--;
                    if (i == 2 || i == 4) {
                        break switch (i) {
                            case 2 -> true;
                            case 4 -> false;
                            default -> throw new IllegalStateException();
                        };
                    } else {
                        break true;
                    }
                default: i--; break switch (i) {
                    case -1 -> false;
                    case 3 -> true;
                    default -> true;
                };
            });
            if (o != 6 && i >= 0) {
                throw new IllegalStateException();
            }
        }
    }

}