/*

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8033581 8033798 8033726

 * @summary Check whitespace in generated output

 */

import java.io.*;

import java.util.*;

public class WhitespaceTest {

    public static void main(String... args) throws Exception {

        new WhitespaceTest().run();

    }

    void run() throws Exception {

        test("-v", "java.lang.String");

        test("-XDtab:1", "-v", "java.lang.String");

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

        for (int i = 10; i < 40; i++)

            test("-XDtab:" + i, "-v", "-classpath", testClasses, "WhitespaceTest$HelloWorld");

        if (errors > 0)

            throw new Exception(errors + " errors found");

    }

    void test(String... args) throws Exception {

        // need to avoid "//" appearing as a constant in the constant pool

        String slash = "/";

        String doubleSlash = slash + slash;

        System.out.println("test: " + Arrays.asList(args));

        String out = javap(args);

        for (String line: out.split("[\r\n]+")) {

            if (line.endsWith(" "))

                error("line has trailing whitespace: " + line);

            int comment = line.indexOf(doubleSlash);

            if (comment > 0 && line.charAt(comment - 1) != ' ') {

                // make allowance for URLs

                if (!line.matches(".*\\bfile:/{3}.*"))

                    error("no space before comment: " + line);

            }

            if (line.matches(" +}"))

                error("bad indentation: " + line);

        }

    }

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

        StringWriter sw = new StringWriter();

        PrintWriter out = new PrintWriter(sw);

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

        out.close();

        System.out.println(sw.toString());

        if (rc < 0)

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

        return sw.toString();

    }

    void error(String msg) {

        System.out.println("Error: " + msg);

        errors++;

    }

    int errors;

    // small class to test repeatedly with different tab values

    static class HelloWorld {

        public static void main(String... args) {

            System.out.println("Hello World!");

        }

    }

}