/*

 * Copyright (c) 1999, 2014, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package com.sun.tools.javac.main;

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.net.URL;

import java.security.DigestInputStream;

import java.security.MessageDigest;

import java.util.Arrays;

import java.util.Collection;

import java.util.LinkedHashMap;

import java.util.LinkedHashSet;

import java.util.Map;

import java.util.Set;

import javax.annotation.processing.Processor;

import javax.tools.JavaFileManager;

import javax.tools.JavaFileObject;

import com.sun.source.util.JavacTask;

import com.sun.source.util.Plugin;

import com.sun.tools.doclint.DocLint;

import com.sun.tools.javac.api.BasicJavacTask;

import com.sun.tools.javac.code.Source;

import com.sun.tools.javac.file.CacheFSInfo;

import com.sun.tools.javac.file.JavacFileManager;

import com.sun.tools.javac.jvm.Profile;

import com.sun.tools.javac.jvm.Target;

import com.sun.tools.javac.processing.AnnotationProcessingError;

import com.sun.tools.javac.processing.JavacProcessingEnvironment;

import com.sun.tools.javac.util.*;

import com.sun.tools.javac.util.Log.PrefixKind;

import com.sun.tools.javac.util.Log.WriterKind;

import com.sun.tools.javac.util.ServiceLoader;

import static com.sun.tools.javac.main.Option.*;

/** This class provides a command line interface to the javac compiler.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class Main {

    /** The name of the compiler, for use in diagnostics.

     */

    String ownName;

    /** The writer to use for diagnostic output.

     */

    PrintWriter out;

    /** The log to use for diagnostic output.

     */

    public Log log;

    /**

     * If true, certain errors will cause an exception, such as command line

     * arg errors, or exceptions in user provided code.

     */

    boolean apiMode;

    /** Result codes.

     */

    public enum Result {

        OK(0),        // Compilation completed with no errors.

        ERROR(1),     // Completed but reported errors.

        CMDERR(2),    // Bad command-line arguments

        SYSERR(3),    // System error or resource exhaustion.

        ABNORMAL(4);  // Compiler terminated abnormally

        Result(int exitCode) {

            this.exitCode = exitCode;

        }

        public boolean isOK() {

            return (exitCode == 0);

        }

        public final int exitCode;

    }

    private Option[] recognizedOptions =

            Option.getJavaCompilerOptions().toArray(new Option[0]);

    private OptionHelper optionHelper = new OptionHelper() {

        @Override

        public String get(Option option) {

            return options.get(option);

        }

        @Override

        public void put(String name, String value) {

            options.put(name, value);

        }

        @Override

        public boolean handleFileManagerOption(Option option, String value) {

            options.put(option.getText(), value);

            deferredFileManagerOptions.put(option, value);

            return true;

        }

        @Override

        public void remove(String name) {

            options.remove(name);

        }

        @Override

        public Log getLog() {

            return log;

        }

        @Override

        public String getOwnName() {

            return ownName;

        }

        @Override

        public void error(String key, Object... args) {

            Main.this.error(key, args);

        }

        @Override

        public void addFile(File f) {

            filenames.add(f);

        }

        @Override

        public void addClassName(String s) {

            classnames.append(s);

        }

    };

    /**

     * Construct a compiler instance.

     */

    public Main(String name) {

        this(name, new PrintWriter(System.err, true));

    }

    /**

     * Construct a compiler instance.

     */

    public Main(String name, PrintWriter out) {

        this.ownName = name;

        this.out = out;

    }

    /** A table of all options that's passed to the JavaCompiler constructor.  */

    private Options options = null;

    /** The list of source files to process

     */

    public Set<File> filenames = null; // XXX should be protected or private

    /** List of class files names passed on the command line

     */

    protected ListBuffer<String> classnames = null;

    public Map<Option, String> deferredFileManagerOptions; // XXX should be protected or private

    /** Report a usage error.

     */

    void error(String key, Object... args) {

        if (apiMode) {

            String msg = log.localize(PrefixKind.JAVAC, key, args);

            throw new PropagatedException(new IllegalStateException(msg));

        }

        warning(key, args);

        log.printLines(PrefixKind.JAVAC, "msg.usage", ownName);

    }

    /** Report a warning.

     */

    void warning(String key, Object... args) {

        log.printRawLines(ownName + ": " + log.localize(PrefixKind.JAVAC, key, args));

    }

    public Option getOption(String flag) {

        for (Option option : recognizedOptions) {

            if (option.matches(flag))

                return option;

        }

        return null;

    }

    public void setOptions(Options options) {

        if (options == null)

            throw new NullPointerException();

        this.options = options;

    }

    public void setAPIMode(boolean apiMode) {

        this.apiMode = apiMode;

    }

    /** Process command line arguments: store all command line options

     *  in `options' table and return all source filenames.

     *  @param flags    The array of command line arguments.

     */

    public Collection<File> processArgs(String[] flags) { // XXX sb protected

        return processArgs(flags, null);

    }

    public Collection<File> processArgs(String[] flags, String[] classNames) { // XXX sb protected

        int ac = 0;

        while (ac < flags.length) {

            String flag = flags[ac];

            ac++;

            Option option = null;

            if (flag.length() > 0) {

                // quick hack to speed up file processing:

                // if the option does not begin with '-', there is no need to check

                // most of the compiler options.

                int firstOptionToCheck = flag.charAt(0) == '-' ? 0 : recognizedOptions.length-1;

                for (int j=firstOptionToCheck; j<recognizedOptions.length; j++) {

                    if (recognizedOptions[j].matches(flag)) {

                        option = recognizedOptions[j];

                        break;

                    }

                }

            }

            if (option == null) {

                error("err.invalid.flag", flag);

                return null;

            }

            if (option.hasArg()) {

                if (ac == flags.length) {

                    error("err.req.arg", flag);

                    return null;

                }

                String operand = flags[ac];

                ac++;

                if (option.process(optionHelper, flag, operand))

                    return null;

            } else {

                if (option.process(optionHelper, flag))

                    return null;

            }

        }

        if (options.get(PROFILE) != null && options.get(BOOTCLASSPATH) != null) {

            error("err.profile.bootclasspath.conflict");

            return null;

        }

        if (this.classnames != null && classNames != null) {

            this.classnames.addAll(Arrays.asList(classNames));

        }

        if (!checkDirectory(D))

            return null;

        if (!checkDirectory(S))

            return null;

        String sourceString = options.get(SOURCE);

        Source source = (sourceString != null)

            ? Source.lookup(sourceString)

            : Source.DEFAULT;

        String targetString = options.get(TARGET);

        Target target = (targetString != null)

            ? Target.lookup(targetString)

            : Target.DEFAULT;

        // We don't check source/target consistency for CLDC, as J2ME

        // profiles are not aligned with J2SE targets; moreover, a

        // single CLDC target may have many profiles.  In addition,

        // this is needed for the continued functioning of the JSR14

        // prototype.

        if (Character.isDigit(target.name.charAt(0))) {

            if (target.compareTo(source.requiredTarget()) < 0) {

                if (targetString != null) {

                    if (sourceString == null) {

                        warning("warn.target.default.source.conflict",

                                targetString,

                                source.requiredTarget().name);

                    } else {

                        warning("warn.source.target.conflict",

                                sourceString,

                                source.requiredTarget().name);

                    }

                    return null;

                } else {

                    target = source.requiredTarget();

                    options.put("-target", target.name);

                }

            } else {

                if (targetString == null && !source.allowGenerics()) {

                    target = Target.JDK1_4;

                    options.put("-target", target.name);

                }

            }

        }

        String profileString = options.get(PROFILE);

        if (profileString != null) {

            Profile profile = Profile.lookup(profileString);

            if (!profile.isValid(target)) {

                warning("warn.profile.target.conflict", profileString, target.name);

                return null;

            }

        }

        // handle this here so it works even if no other options given

        String showClass = options.get("showClass");

        if (showClass != null) {

            if (showClass.equals("showClass")) // no value given for option

                showClass = "com.sun.tools.javac.Main";

            showClass(showClass);

        }

        options.notifyListeners();

        return filenames;

    }

    // where

        private boolean checkDirectory(Option option) {

            String value = options.get(option);

            if (value == null)

                return true;

            File file = new File(value);

            if (!file.exists()) {

                error("err.dir.not.found", value);

                return false;

            }

            if (!file.isDirectory()) {

                error("err.file.not.directory", value);

                return false;

            }

            return true;

        }

    /** Programmatic interface for main function.

     * @param args    The command line parameters.

     */

    public Result compile(String[] args) {

        Context context = new Context();

        JavacFileManager.preRegister(context); // can't create it until Log has been set up

        Result result = compile(args, context);

        if (fileManager instanceof JavacFileManager) {

            // A fresh context was created above, so jfm must be a JavacFileManager

            ((JavacFileManager)fileManager).close();

        }

        return result;

    }

    public Result compile(String[] args, Context context) {

        return compile(args, context, List.<JavaFileObject>nil(), null);

    }

    /** Programmatic interface for main function.

     * @param args    The command line parameters.

     */

                       Context context,

                       List<JavaFileObject> fileObjects,

                       Iterable<? extends Processor> processors)

    {

        return compile(args,  null, context, fileObjects, processors);

    }

    public Result compile(String[] args,

                          String[] classNames,

                          Context context,

                          List<JavaFileObject> fileObjects,

                          Iterable<? extends Processor> processors)

    {

        context.put(Log.outKey, out);

        log = Log.instance(context);

        if (options == null)

            options = Options.instance(context); // creates a new one

        filenames = new LinkedHashSet<>();

        classnames = new ListBuffer<>();

        deferredFileManagerOptions = new LinkedHashMap<>();

        JavaCompiler comp = null;

        /*

         * TODO: Logic below about what is an acceptable command line

         * should be updated to take annotation processing semantics

         * into account.

         */

        try {

            if (args.length == 0

                    && (classNames == null || classNames.length == 0)

                    && fileObjects.isEmpty()) {

                Option.HELP.process(optionHelper, "-help");

                return Result.CMDERR;

            }

            Collection<File> files;

            try {

                files = processArgs(CommandLine.parse(args), classNames);

                if (files == null) {

                    // null signals an error in options, abort

                    return Result.CMDERR;

                } else if (files.isEmpty() && fileObjects.isEmpty() && classnames.isEmpty()) {

                    // it is allowed to compile nothing if just asking for help or version info

                    if (options.isSet(HELP)

                        || options.isSet(X)

                        || options.isSet(VERSION)

                        || options.isSet(FULLVERSION))

                        return Result.OK;

                    if (JavaCompiler.explicitAnnotationProcessingRequested(options)) {

                        error("err.no.source.files.classes");

                    } else {

                        error("err.no.source.files");

                    }

                    return Result.CMDERR;

                }

            } catch (java.io.FileNotFoundException e) {

                warning("err.file.not.found", e.getMessage());

                return Result.SYSERR;

            }

            boolean forceStdOut = options.isSet("stdout");

            if (forceStdOut) {

                log.flush();

                log.setWriters(new PrintWriter(System.out, true));

            }

            // allow System property in following line as a Mustang legacy

            boolean batchMode = (options.isUnset("nonBatchMode")

                        && System.getProperty("nonBatchMode") == null);

            if (batchMode)

                CacheFSInfo.preRegister(context);

            fileManager = context.get(JavaFileManager.class);

            if (fileManager instanceof BaseFileManager) {

                ((BaseFileManager) fileManager).handleOptions(deferredFileManagerOptions);

            }

            // FIXME: this code will not be invoked if using JavacTask.parse/analyze/generate

            // invoke any available plugins

            String plugins = options.get(PLUGIN);

            if (plugins != null) {

                JavacProcessingEnvironment pEnv = JavacProcessingEnvironment.instance(context);

                ClassLoader cl = pEnv.getProcessorClassLoader();

                ServiceLoader<Plugin> sl = ServiceLoader.load(Plugin.class, cl);

                Set<List<String>> pluginsToCall = new LinkedHashSet<>();

                for (String plugin: plugins.split("\\x00")) {

                    pluginsToCall.add(List.from(plugin.split("\\s+")));

                }

                JavacTask task = null;

                for (Plugin plugin : sl) {

                    for (List<String> p : pluginsToCall) {

                        if (plugin.getName().equals(p.head)) {

                            pluginsToCall.remove(p);

                            try {

                                if (task == null)

                                    task = JavacTask.instance(pEnv);

                                plugin.init(task, p.tail.toArray(new String[p.tail.size()]));

                            } catch (Throwable ex) {

                                if (apiMode)

                                    throw new RuntimeException(ex);

                                pluginMessage(ex);

                                return Result.SYSERR;

                            }

                        }

                    }

                }

                for (List<String> p: pluginsToCall) {

                    log.printLines(PrefixKind.JAVAC, "msg.plugin.not.found", p.head);

                }

            }

            comp = JavaCompiler.instance(context);