/*

 * 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 6921495

 * @summary spurious semicolons in class def cause empty NOPOS blocks

 */

import java.io.*;

import java.net.*;

import java.util.*;

import javax.tools.*;

import com.sun.source.util.*;

public class ExtraSemiTest {

    static class JavaSource extends SimpleJavaFileObject {

        final static String source =

                        "class C {\n" +

                        "    int x;;\n" +

                        "    class X { int i;; };\n" +

                        "}";

        JavaSource() {

            super(URI.create("myfo:/C.java"), JavaFileObject.Kind.SOURCE);

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

    }

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

        new ExtraSemiTest().run();

    }

    void run() throws IOException {

        File destDir = new File("classes"); destDir.mkdir();

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavaSource source = new JavaSource();

        JavacTask ct = (JavacTask)tool.getTask(null, null, null,

                Arrays.asList("-d", destDir.getPath(), "-XD-printsource"),

                null,

                Arrays.asList(source));

        Boolean ok = ct.call();

        if (!ok) throw new AssertionError("compilation failed");

        String text = readFile(new File(destDir, "C.java"));

        System.out.println(text);

        // compress/canonicalize all whitespace

        String canon = text.replaceAll("\\s+", " ");

        System.out.println("canon: " + canon);

        // There are no empty blocks in the original text.

        // C will be given a default constructor "C() { super(); }" which

        // does not have any empty blocks.

        // The bug is that spurious semicolons in the class defn are parsed

        // into redundant empty blocks in the tree, so verify there are

        // no empty blocks in the -printsource output

        if (canon.contains("{ }"))

            throw new AssertionError("unexpected empty block found");

    }

    String readFile(File f) throws IOException {

        int len = (int) f.length();

        byte[] data = new byte[len];

        DataInputStream in = new DataInputStream(new FileInputStream(f));

        try {

            in.readFully(data);

            return new String(data);

        } finally {

            in.close();

        }

    }

}