/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * 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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 */

/*

 * @test

 * @bug 8143366

 * @summary Check that control chars are displayed correctly

 * @modules jdk.jdeps/com.sun.tools.javap

 * @run testng ControlCharTest

 */

import org.testng.Assert;

import org.testng.annotations.AfterClass;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import java.io.IOException;

import java.io.PrintWriter;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Scanner;

import java.util.regex.Pattern;

public class ControlCharTest {

    private String classpath;

    private Path output;

    private Pattern ptrn;

    @BeforeClass

    public void initialize() throws Exception {

        String testClasses = System.getProperty("test.classes", ".");

        classpath = "-classpath " + testClasses + " ControlCharTest$Strings";

        String userdir = System.getProperty("user.dir", ".");

        output = Paths.get(userdir, "output.txt");

        String regex = Pattern.quote("\\u0001\\u0002\\u0003")  // \u0001\u0002\u0003

                + ".+123.+"                   // 123

                + Pattern.quote("\\\\u0000")  // \\u0000

                + ".+"

                + Pattern.quote("\\u0000")    // \u0000

                ;

        ptrn = Pattern.compile(regex, Pattern.DOTALL);

    }

    @AfterClass

    public void close() throws IOException {

        Files.deleteIfExists(output);

    }

    @DataProvider(name = "options")

    public Object[][] createData() {

        return new Object[][] {

                { "-v", ""},

                { "-constants", ""}

        };

    }

    @Test(dataProvider = "options")

    public void test(String option, String ignore) throws Exception {

        String cmdline = option + " " + classpath;

        javap(cmdline.split(" +"));

        try (Scanner scnr = new Scanner(output)) {

            Assert.assertNotNull(scnr.findWithinHorizon(ptrn, 0));

        }

    }

    private void javap(String... args) throws Exception {

        try (PrintWriter out = new PrintWriter(output.toFile())) {

            int rc = com.sun.tools.javap.Main.run(args, out);

            if (rc < 0)

                throw new Exception("javap exited, rc=" + rc);

        }

    }

    // small class to test

    static class Strings {

        static final String s = "\1\2\3";

        static final String s1 = "123";

        static final String s2 = "\\u0000";

        static final String s3 = "\0";

        static String f() { return s + s1 + s2 + s3; }

    }

}