/*

 * 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

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 */

/*

 * @test

 * @summary Test latest, latestSupported, underscore as keyword, etc.

 * @author  Joseph D. Darcy

 * @modules java.compiler

 *          jdk.compiler

 */

import java.util.*;

import javax.lang.model.SourceVersion;

import static javax.lang.model.SourceVersion.*;

/**

 * Verify latest[Supported] behavior.

 */

public class TestSourceVersion {

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

        testLatestSupported();

        testVersionVaryingKeywords();

        testRestrictedKeywords();

    }

    private static void testLatestSupported() {

        if (SourceVersion.latest() != RELEASE_10 ||

            SourceVersion.latestSupported() != RELEASE_10)

            throw new RuntimeException("Unexpected release value(s) found:\n" +

                                       "latest:\t" + SourceVersion.latest() + "\n" +

                                       "latestSupported:\t" + SourceVersion.latestSupported());

    }

    private static void testVersionVaryingKeywords() {

        Map<String, SourceVersion> keyWordStart =

            Map.of("strictfp", RELEASE_2,

                   "assert",   RELEASE_4,

                   "enum",     RELEASE_5,

                   "_",        RELEASE_9);

        for (Map.Entry<String, SourceVersion> entry : keyWordStart.entrySet()) {

            String key = entry.getKey();

            SourceVersion value = entry.getValue();

            check(true, isKeyword(key), "keyword", latest());

            check(false, isName(key),   "name",    latest());

            for(SourceVersion version : SourceVersion.values()) {

                boolean isKeyword = version.compareTo(value) >= 0;

                check(isKeyword,  isKeyword(key, version), "keyword", version);

                check(!isKeyword, isName(key, version),    "name",    version);

            }

        }

    }

    private static void testRestrictedKeywords() {

        // Restricted keywords are not full keywords

        /*

         * JLS 3.9

         * " A further ten character sequences are restricted

         * keywords: open, module, requires, transitive, exports,

         * opens, to, uses, provides, and with"

         */

        Set<String> restrictedKeywords =

            Set.of("open", "module", "requires", "transitive", "exports",

                   "opens", "to", "uses", "provides", "with");

        for(String key : restrictedKeywords) {

            for(SourceVersion version : SourceVersion.values()) {

                check(false, isKeyword(key, version), "keyword", version);

                check(true,  isName(key, version),    "name",    version);

            }

        }

    }

    private static void check(boolean result, boolean expected,

                              String message, SourceVersion version) {

        if (result != expected) {

            throw new RuntimeException("Unexpected " + message +  "-ness of _ on " + version);

        }

    }

}