/*

 * Copyright 2007-2008 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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,

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.tools.javap;

import java.io.EOFException;

import java.io.FileNotFoundException;

import java.io.FilterInputStream;

import java.io.InputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.io.Writer;

import java.security.DigestInputStream;

import java.security.MessageDigest;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Locale;

import java.util.Map;

import java.util.MissingResourceException;

import java.util.ResourceBundle;

import javax.tools.Diagnostic;

import javax.tools.DiagnosticListener;

import javax.tools.JavaFileManager;

import javax.tools.JavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.StandardLocation;

import com.sun.tools.classfile.*;

/**

 *  "Main" class for javap, normally accessed from the command line

 *  via Main, or from JSR199 via DisassemblerTool.

 *

 *  <p><b>This is NOT part of any API supported by Sun Microsystems.  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 JavapTask implements DisassemblerTool.DisassemblerTask {

    public class BadArgs extends Exception {

        static final long serialVersionUID = 8765093759964640721L;

        BadArgs(String key, Object... args) {

            super(JavapTask.this.getMessage(key, args));

            this.key = key;

            this.args = args;

        }

        BadArgs showUsage(boolean b) {

            showUsage = b;

            return this;

        }

        final String key;

        final Object[] args;

        boolean showUsage;

    }

    static abstract class Option {

        Option(boolean hasArg, String... aliases) {

            this.hasArg = hasArg;

            this.aliases = aliases;

        }

        boolean matches(String opt) {

            for (String a: aliases) {

                if (a.equals(opt))

                    return true;

            }

            return false;

        }

        boolean ignoreRest() {

            return false;

        }

        abstract void process(JavapTask task, String opt, String arg) throws BadArgs;

        final boolean hasArg;

        final String[] aliases;

    }

    static Option[] recognizedOptions = {

        new Option(false, "-help", "--help", "-?") {

            void process(JavapTask task, String opt, String arg) {

                task.options.help = true;

            }

        },

        new Option(false, "-version") {

            void process(JavapTask task, String opt, String arg) {

                task.options.version = true;

            }

        },

        new Option(false, "-fullversion") {

            void process(JavapTask task, String opt, String arg) {

                task.options.fullVersion = true;

            }

        },

        new Option(false, "-v", "-verbose", "-all") {

            void process(JavapTask task, String opt, String arg) {

                task.options.verbose = true;

                task.options.showFlags = true;

                task.options.showAllAttrs = true;

            }

        },

        new Option(false, "-l") {

            void process(JavapTask task, String opt, String arg) {

                task.options.showLineAndLocalVariableTables = true;

            }

        },

        new Option(false, "-public") {

            void process(JavapTask task, String opt, String arg) {

                task.options.accessOptions.add(opt);

                task.options.showAccess = AccessFlags.ACC_PUBLIC;

            }

        },

        new Option(false, "-protected") {

            void process(JavapTask task, String opt, String arg) {

                task.options.accessOptions.add(opt);

                task.options.showAccess = AccessFlags.ACC_PROTECTED;

            }

        },

        new Option(false, "-package") {

            void process(JavapTask task, String opt, String arg) {

                task.options.accessOptions.add(opt);

                task.options.showAccess = 0;

            }

        },

        new Option(false, "-p", "-private") {

            void process(JavapTask task, String opt, String arg) {

                if (!task.options.accessOptions.contains("-p") &&

                        !task.options.accessOptions.contains("-private")) {

                    task.options.accessOptions.add(opt);

                }

                task.options.showAccess = AccessFlags.ACC_PRIVATE;

            }

        },

        new Option(false, "-c") {

            void process(JavapTask task, String opt, String arg) {

                task.options.showDisassembled = true;

            }

        },

        new Option(false, "-s") {

            void process(JavapTask task, String opt, String arg) {

                task.options.showInternalSignatures = true;

            }

        },

//        new Option(false, "-all") {

//            void process(JavapTask task, String opt, String arg) {

//                task.options.showAllAttrs = true;

//            }

//        },

        new Option(false, "-h") {

            void process(JavapTask task, String opt, String arg) throws BadArgs {

                throw task.new BadArgs("err.h.not.supported");

            }

        },

        new Option(false, "-verify", "-verify-verbose") {

            void process(JavapTask task, String opt, String arg) throws BadArgs {

                throw task.new BadArgs("err.verify.not.supported");

            }

        },

        new Option(false, "-sysinfo") {

            void process(JavapTask task, String opt, String arg) {

                task.options.sysInfo = true;

            }

        },

        new Option(false, "-Xold") {

            void process(JavapTask task, String opt, String arg) throws BadArgs {

                // -Xold is only supported as first arg when invoked from

                // command line; this is handled in Main,main

                throw task.new BadArgs("err.Xold.not.supported.here");

            }

        },

        new Option(false, "-Xnew") {

            void process(JavapTask task, String opt, String arg) throws BadArgs {

                // ignore: this _is_ the new version

            }

        },

        new Option(false, "-XDcompat") {

            void process(JavapTask task, String opt, String arg) {

                task.options.compat = true;

            }

        },

        new Option(false, "-XDjsr277") {

            void process(JavapTask task, String opt, String arg) {

                task.options.jsr277 = true;

            }

        },

        new Option(false, "-XDignore.symbol.file") {

            void process(JavapTask task, String opt, String arg) {

                task.options.ignoreSymbolFile = true;

            }

        },

        new Option(false, "-constants") {

            void process(JavapTask task, String opt, String arg) {

                task.options.showConstants = true;

            }

        }

    };

    JavapTask() {

        context = new Context();

        options = Options.instance(context);

    }

    JavapTask(Writer out,

            JavaFileManager fileManager,

            DiagnosticListener<? super JavaFileObject> diagnosticListener,

            Iterable<String> options,

            Iterable<String> classes) {

        this();

        this.log = getPrintWriterForWriter(out);

        this.fileManager = fileManager;

        this.diagnosticListener = diagnosticListener;

        try {

            handleOptions(options, false);

        } catch (BadArgs e) {

            throw new IllegalArgumentException(e.getMessage());

        }

        this.classes = new ArrayList<String>();

        for (String classname: classes) {

            classname.getClass(); // null-check

            this.classes.add(classname);

        }

    }

    public void setLocale(Locale locale) {

        if (locale == null)

            locale = Locale.getDefault();

        task_locale = locale;

    }

    public void setLog(PrintWriter log) {

        this.log = log;

    }

    public void setLog(OutputStream s) {

        setLog(getPrintWriterForStream(s));

    }

    private static PrintWriter getPrintWriterForStream(OutputStream s) {

        return new PrintWriter(s, true);

    }

    private static PrintWriter getPrintWriterForWriter(Writer w) {

        if (w == null)

            return getPrintWriterForStream(null);

        else if (w instanceof PrintWriter)

            return (PrintWriter) w;

        else

            return new PrintWriter(w, true);

    }

    public void setDiagnosticListener(DiagnosticListener<? super JavaFileObject> dl) {

        diagnosticListener = dl;

    }

    public void setDiagnosticListener(OutputStream s) {

        setDiagnosticListener(getDiagnosticListenerForStream(s));

    }

    private DiagnosticListener<JavaFileObject> getDiagnosticListenerForStream(OutputStream s) {

        return getDiagnosticListenerForWriter(getPrintWriterForStream(s));

    }

    private DiagnosticListener<JavaFileObject> getDiagnosticListenerForWriter(Writer w) {

        final PrintWriter pw = getPrintWriterForWriter(w);

        return new DiagnosticListener<JavaFileObject> () {

            public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

                if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {

                        pw.print(getMessage("err.prefix"));

                    pw.print(" ");

                }

                pw.println(diagnostic.getMessage(null));

            }

        };

    }

    /** Result codes.

     */

    static final int

        EXIT_OK = 0,        // Compilation completed with no errors.

        EXIT_ERROR = 1,     // Completed but reported errors.

        EXIT_CMDERR = 2,    // Bad command-line arguments

        EXIT_SYSERR = 3,    // System error or resource exhaustion.

        EXIT_ABNORMAL = 4;  // Compiler terminated abnormally

    int run(String[] args) {

        try {

            handleOptions(args);

            // the following gives consistent behavior with javac

            if (classes == null || classes.size() == 0) {

                if (options.help || options.version || options.fullVersion)

                    return EXIT_OK;

                else

                    return EXIT_CMDERR;

            }

            boolean ok = run();

            return ok ? EXIT_OK : EXIT_ERROR;

        } catch (BadArgs e) {

            diagnosticListener.report(createDiagnostic(e.key, e.args));

            if (e.showUsage) {

                log.println(getMessage("main.usage.summary", progname));

            }

            return EXIT_CMDERR;

        } catch (InternalError e) {

            Object[] e_args;

            if (e.getCause() == null)

                e_args = e.args;

            else {

                e_args = new Object[e.args.length + 1];

                e_args[0] = e.getCause();

                System.arraycopy(e.args, 0, e_args, 1, e.args.length);

            }

            diagnosticListener.report(createDiagnostic("err.internal.error", e_args));

            return EXIT_ABNORMAL;

        } finally {

            log.flush();

        }

    }

    public void handleOptions(String[] args) throws BadArgs {

        handleOptions(Arrays.asList(args), true);

    }

    private void handleOptions(Iterable<String> args, boolean allowClasses) throws BadArgs {

        if (log == null) {

            log = getPrintWriterForStream(System.out);

            if (diagnosticListener == null)

              diagnosticListener = getDiagnosticListenerForStream(System.err);

        } else {

            if (diagnosticListener == null)

              diagnosticListener = getDiagnosticListenerForWriter(log);

        }

        if (fileManager == null)

            fileManager = getDefaultFileManager(diagnosticListener, log);

        Iterator<String> iter = args.iterator();

        boolean noArgs = !iter.hasNext();

        while (iter.hasNext()) {

            String arg = iter.next();

            if (arg.startsWith("-"))

                handleOption(arg, iter);

            else if (allowClasses) {

                if (classes == null)

                    classes = new ArrayList<String>();

                classes.add(arg);

                while (iter.hasNext())

                    classes.add(iter.next());

            } else

                throw new BadArgs("err.unknown.option", arg).showUsage(true);

        }

        if (!options.compat && options.accessOptions.size() > 1) {

            StringBuilder sb = new StringBuilder();

            for (String opt: options.accessOptions) {

                if (sb.length() > 0)

                    sb.append(" ");

                sb.append(opt);

            }

            throw new BadArgs("err.incompatible.options", sb);

        }

        if (options.ignoreSymbolFile && fileManager instanceof JavapFileManager)

            ((JavapFileManager) fileManager).setIgnoreSymbolFile(true);

        if ((classes == null || classes.size() == 0) &&

                !(noArgs || options.help || options.version || options.fullVersion)) {

            throw new BadArgs("err.no.classes.specified");

        }

        if (noArgs || options.help)

            showHelp();

        if (options.version || options.fullVersion)

            showVersion(options.fullVersion);

    }

    private void handleOption(String name, Iterator<String> rest) throws BadArgs {

        for (Option o: recognizedOptions) {

            if (o.matches(name)) {

                if (o.hasArg) {

                    if (rest.hasNext())

                        o.process(this, name, rest.next());

                    else

                        throw new BadArgs("err.missing.arg", name).showUsage(true);

                } else

                    o.process(this, name, null);

                if (o.ignoreRest()) {

                    while (rest.hasNext())

                        rest.next();

                }

                return;

            }

        }

        if (fileManager.handleOption(name, rest))

            return;

        throw new BadArgs("err.unknown.option", name).showUsage(true);

    }

    public Boolean call() {

        return run();

    }

    public boolean run() {

        if (classes == null || classes.size() == 0)

            return false;

        context.put(PrintWriter.class, log);

        ClassWriter classWriter = ClassWriter.instance(context);

        boolean ok = true;

        for (String className: classes) {

            JavaFileObject fo;

            try {

                if (className.endsWith(".class")) {

                    if (fileManager instanceof StandardJavaFileManager) {

                        StandardJavaFileManager sfm = (StandardJavaFileManager) fileManager;

                        fo = sfm.getJavaFileObjects(className).iterator().next();

                    } else {

                       diagnosticListener.report(createDiagnostic("err.not.standard.file.manager", className));

                       ok = false;

                       continue;

                    }

                } else {

                    fo = getClassFileObject(className);

                    if (fo == null) {

                        // see if it is an inner class, by replacing dots to $, starting from the right

                        String cn = className;

                        int lastDot;

                        while (fo == null && (lastDot = cn.lastIndexOf(".")) != -1) {

                            cn = cn.substring(0, lastDot) + "$" + cn.substring(lastDot + 1);

                            fo = getClassFileObject(cn);

                        }

                    }

                    if (fo == null) {

                       diagnosticListener.report(createDiagnostic("err.class.not.found", className));

                       ok = false;

                       continue;

                    }

                }

                Attribute.Factory attributeFactory = new Attribute.Factory();

                attributeFactory.setCompat(options.compat);

                attributeFactory.setJSR277(options.jsr277);

                InputStream in = fo.openInputStream();

                SizeInputStream sizeIn = null;

                MessageDigest md  = null;

                if (options.sysInfo || options.verbose) {

                    md = MessageDigest.getInstance("MD5");

                    in = new DigestInputStream(in, md);

                    in = sizeIn = new SizeInputStream(in);

                }

                ClassFile cf = ClassFile.read(in, attributeFactory);

                if (options.sysInfo || options.verbose) {

                    classWriter.setFile(fo.toUri());