/*

 * Copyright (c) 2010, 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.

 *

 * 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 6964768 6964461 6964469 6964487 6964460 6964481 6980021

 * @summary need test program to validate javac resource bundles

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

 *          jdk.compiler/com.sun.tools.javac.code

 */

import java.io.*;

import java.util.*;

import javax.tools.*;

import com.sun.tools.classfile.*;

import com.sun.tools.javac.code.Lint.LintCategory;

/**

 * Compare string constants in javac classes against keys in javac resource bundles.

 */

public class CheckResourceKeys {

    /**

     * Main program.

     * Options:

     * -finddeadkeys

     *      look for keys in resource bundles that are no longer required

     * -findmissingkeys

     *      look for keys in resource bundles that are missing

     *

     * @throws Exception if invoked by jtreg and errors occur

     */

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

        CheckResourceKeys c = new CheckResourceKeys();

        if (c.run(args))

            return;

        if (is_jtreg())

            throw new Exception(c.errors + " errors occurred");

        else

            System.exit(1);

    }

    static boolean is_jtreg() {

        return (System.getProperty("test.src") != null);

    }

    /**

     * Main entry point.

     */

    boolean run(String... args) throws Exception {

        boolean findDeadKeys = false;

        boolean findMissingKeys = false;

        if (args.length == 0) {

            if (is_jtreg()) {

                findDeadKeys = true;

                findMissingKeys = true;

            } else {

                System.err.println("Usage: java CheckResourceKeys <options>");

                System.err.println("where options include");

                System.err.println("  -finddeadkeys      find keys in resource bundles which are no longer required");

                System.err.println("  -findmissingkeys   find keys in resource bundles that are required but missing");

                return true;

            }

        } else {

            for (String arg: args) {

                if (arg.equalsIgnoreCase("-finddeadkeys"))

                    findDeadKeys = true;

                else if (arg.equalsIgnoreCase("-findmissingkeys"))

                    findMissingKeys = true;

                else

                    error("bad option: " + arg);

            }

        }

        if (errors > 0)

            return false;

        Set<String> codeStrings = getCodeStrings();

        Set<String> resourceKeys = getResourceKeys();

        if (findDeadKeys)

            findDeadKeys(codeStrings, resourceKeys);

        if (findMissingKeys)

            findMissingKeys(codeStrings, resourceKeys);

        return (errors == 0);

    }

    /**

     * Find keys in resource bundles which are probably no longer required.

     * A key is probably required if there is a string fragment in the code

     * that is part of the resource key, or if the key is well-known

     * according to various pragmatic rules.

     */

    void findDeadKeys(Set<String> codeStrings, Set<String> resourceKeys) {

        String[] prefixes = {

            "compiler.err.", "compiler.warn.", "compiler.note.", "compiler.misc.",

            "javac."

        };

        for (String rk: resourceKeys) {

            // some keys are used directly, without a prefix.

            if (codeStrings.contains(rk))

                continue;

            // remove standard prefix

            String s = null;

            for (int i = 0; i < prefixes.length && s == null; i++) {

                if (rk.startsWith(prefixes[i])) {

                    s = rk.substring(prefixes[i].length());

                }

            }

            if (s == null) {

                error("Resource key does not start with a standard prefix: " + rk);

                continue;

            }

            if (codeStrings.contains(s))

                continue;

            // keys ending in .1 are often synthesized

            if (s.endsWith(".1") && codeStrings.contains(s.substring(0, s.length() - 2)))

                continue;

            // verbose keys are generated by ClassReader.printVerbose

            if (s.startsWith("verbose.") && codeStrings.contains(s.substring(8)))

                continue;

            // mandatory warning messages are synthesized with no characteristic substring

            if (isMandatoryWarningString(s))

                continue;

            // check known (valid) exceptions

            if (knownRequired.contains(rk))

                continue;

            // check known suspects

            if (needToInvestigate.contains(rk))

                continue;

            //check lint description keys:

            if (s.startsWith("opt.Xlint.desc.")) {

                String option = s.substring(15);

                boolean found = false;

                for (LintCategory lc : LintCategory.values()) {

                    if (option.equals(lc.option))

                        found = true;

                }

                if (found)

                    continue;

            }

            error("Resource key not found in code: " + rk);

        }

    }

    /**

     * The keys for mandatory warning messages are all synthesized and do not

     * have a significant recognizable substring to look for.

     */

    private boolean isMandatoryWarningString(String s) {

        String[] bases = { "deprecated", "unchecked", "varargs" };

        String[] tails = { ".filename", ".filename.additional", ".plural", ".plural.additional", ".recompile" };

        for (String b: bases) {

            if (s.startsWith(b)) {

                String tail = s.substring(b.length());

                for (String t: tails) {

                    if (tail.equals(t))

                        return true;

                }

            }

        }

        return false;

    }

    Set<String> knownRequired = new TreeSet<String>(Arrays.asList(

        // See Resolve.getErrorKey

        "compiler.err.cant.resolve.args",

        "compiler.err.cant.resolve.args.params",

        "compiler.err.cant.resolve.location.args",

        "compiler.err.cant.resolve.location.args.params",

        "compiler.misc.cant.resolve.location.args",

        "compiler.misc.cant.resolve.location.args.params",

        // JavaCompiler, reports #errors and #warnings

        "compiler.misc.count.error",

        "compiler.misc.count.error.plural",

        "compiler.misc.count.warn",

        "compiler.misc.count.warn.plural",

        // Used for LintCategory

        "compiler.warn.lintOption",

        // Other

        "compiler.misc.base.membership"                                 // (sic)

        ));

    Set<String> needToInvestigate = new TreeSet<String>(Arrays.asList(

        "compiler.misc.fatal.err.cant.close.loader",        // Supressed by JSR308

        "compiler.err.cant.read.file",                      // UNUSED

        "compiler.err.illegal.self.ref",                    // UNUSED

        "compiler.err.io.exception",                        // UNUSED

        "compiler.err.limit.pool.in.class",                 // UNUSED

        "compiler.err.name.reserved.for.internal.use",      // UNUSED

        "compiler.err.no.match.entry",                      // UNUSED

        "compiler.err.not.within.bounds.explain",           // UNUSED

        "compiler.err.signature.doesnt.match.intf",         // UNUSED

        "compiler.err.signature.doesnt.match.supertype",    // UNUSED

        "compiler.err.type.var.more.than.once",             // UNUSED

        "compiler.err.type.var.more.than.once.in.result",   // UNUSED

        "compiler.misc.non.denotable.type",                 // UNUSED

        "compiler.misc.unnamed.package",                    // should be required, CR 6964147

        "compiler.warn.proc.type.already.exists",           // TODO in JavacFiler

        "javac.err.invalid.arg",                            // UNUSED ??

        "javac.opt.arg.class",                              // UNUSED ??

        "javac.opt.arg.pathname",                           // UNUSED ??

        "javac.opt.moreinfo",                               // option commented out

        "javac.opt.nogj",                                   // UNUSED

        "javac.opt.printsearch",                            // option commented out

        "javac.opt.prompt",                                 // option commented out

        "javac.opt.s"                                       // option commented out

        ));

    /**

     * For all strings in the code that look like they might be fragments of

     * a resource key, verify that a key exists.

     */

    void findMissingKeys(Set<String> codeStrings, Set<String> resourceKeys) {

        for (String cs: codeStrings) {

            if (cs.matches("[A-Za-z][^.]*\\..*")) {

                // ignore filenames (i.e. in SourceFile attribute

                if (cs.matches(".*\\.java"))

                    continue;

                // ignore package and class names

                if (cs.matches("(com|java|javax|jdk|sun)\\.[A-Za-z.]+"))

                    continue;

                // explicit known exceptions

                if (noResourceRequired.contains(cs))

                    continue;

                // look for matching resource

                if (hasMatch(resourceKeys, cs))

                    continue;

                error("no match for \"" + cs + "\"");

            }

        }

    }

    // where

    private Set<String> noResourceRequired = new HashSet<String>(Arrays.asList(

            // system properties

            "application.home", // in Paths.java

            "env.class.path",

            "line.separator",

            "os.name",

            "user.dir",

            // file names

            "ct.sym",

            "rt.jar",

            "jfxrt.jar",

            // -XD option names

            "process.packages",

            "ignore.symbol.file",

            "fileManager.deferClose",

            // prefix/embedded strings

            "compiler.",

            "compiler.misc.",

            "opt.Xlint.desc.",

            "count.",

            "illegal.",

            "javac.",

    ));

    /**

     * Look for a resource that ends in this string fragment.

     */

    boolean hasMatch(Set<String> resourceKeys, String s) {

        for (String rk: resourceKeys) {

            if (rk.endsWith(s))

                return true;

        }

        return false;

    }

    /**

     * Get the set of strings from (most of) the javac classfiles.

     */

    Set<String> getCodeStrings() throws IOException {

        Set<String> results = new TreeSet<String>();

        JavaCompiler c = ToolProvider.getSystemJavaCompiler();

        try (JavaFileManager fm = c.getStandardFileManager(null, null, null)) {

            JavaFileManager.Location javacLoc = findJavacLocation(fm);

            String[] pkgs = {

                "javax.annotation.processing",

                "javax.lang.model",

                "javax.tools",

                "com.sun.source",

                "com.sun.tools.javac"

            };

            for (String pkg: pkgs) {

                for (JavaFileObject fo: fm.list(javacLoc,

                        pkg, EnumSet.of(JavaFileObject.Kind.CLASS), true)) {

                    String name = fo.getName();

                    // ignore resource files, and files which are not really part of javac

                    if (name.matches(".*resources.[A-Za-z_0-9]+\\.class.*")

                            || name.matches(".*CreateSymbols\\.class.*"))

                        continue;

                    scan(fo, results);

                }

            }

            return results;

        }

    }

    // depending on how the test is run, javac may be on bootclasspath or classpath

    JavaFileManager.Location findJavacLocation(JavaFileManager fm) {

        JavaFileManager.Location[] locns =

            { StandardLocation.PLATFORM_CLASS_PATH, StandardLocation.CLASS_PATH };

        try {

            for (JavaFileManager.Location l: locns) {

                JavaFileObject fo = fm.getJavaFileForInput(l,

                    "com.sun.tools.javac.Main", JavaFileObject.Kind.CLASS);

                if (fo != null)

                    return l;

            }

        } catch (IOException e) {

            throw new Error(e);

        }

        throw new IllegalStateException("Cannot find javac");

    }

    /**

     * Get the set of strings from a class file.

     * Only strings that look like they might be a resource key are returned.

     */

    void scan(JavaFileObject fo, Set<String> results) throws IOException {

        InputStream in = fo.openInputStream();

        try {

            ClassFile cf = ClassFile.read(in);

            for (ConstantPool.CPInfo cpinfo: cf.constant_pool.entries()) {

                if (cpinfo.getTag() == ConstantPool.CONSTANT_Utf8) {

                    String v = ((ConstantPool.CONSTANT_Utf8_info) cpinfo).value;

                    if (v.matches("[A-Za-z0-9-_.]+"))

                        results.add(v);

                }

            }

        } catch (ConstantPoolException ignore) {

        } finally {

            in.close();

        }

    }

    /**

     * Get the set of keys from the javac resource bundles.

     */

    Set<String> getResourceKeys() {

        Set<String> results = new TreeSet<String>();

        for (String name : new String[]{"javac", "compiler"}) {

            ResourceBundle b =

            results.addAll(b.keySet());

        }

        return results;

    }

    /**

     * Report an error.

     */

    void error(String msg) {

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

        errors++;

    }

    int errors;

}