src/main/java/com/android/tools/r8/ReadMainDexList.java

// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8;

import com.android.tools.r8.naming.ClassNameMapper;
import com.android.tools.r8.utils.FileUtils;
import com.android.tools.r8.utils.StringUtils;
import com.google.common.collect.Iterators;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Iterator;
import java.util.function.Function;
import java.util.stream.Collectors;

/**
 * Utility for applying proguard map and sorting the main dex list.
 */
public class ReadMainDexList {

  private static final String DOT_CLASS = ".class";

  private String stripDotClass(String name) {
    return name.endsWith(DOT_CLASS) ? name.substring(0, name.length() - DOT_CLASS.length()) : name;
  }

  private String toClassFilePath(String name) {
    return name.replace('.', '/') + DOT_CLASS;
  }

  private String toKeepRule(String className) {
    return "-keep class " + className + " {}";
  }

  private String deobfuscateClassName(String name, ClassNameMapper mapper) {
    if (mapper == null) {
      return name;
    }
    return mapper.deobfuscateClassName(name);
  }

  private void run(String[] args) throws Exception {
    if (args.length < 1 || args.length > 3) {
      throw new RuntimeException(
          StringUtils.joinLines(
              "Invalid invocation.", "Usage: command [-k] <main_dex_list> [<proguard_map>]"));
    }

    Iterator<String> arguments = Iterators.forArray(args);
    Function<String, String> outputGenerator;
    String arg = arguments.next();
    if (arg.equals("-k")) {
      outputGenerator = this::toKeepRule;
      arg = arguments.next();
    } else {
      outputGenerator = this::toClassFilePath;
    }
    Path mainDexList = Paths.get(arg);

    final ClassNameMapper mapper =
        arguments.hasNext() ? ClassNameMapper.mapperFromFile(Paths.get(arguments.next())) : null;

    FileUtils.readAllLines(mainDexList)
        .stream()
        .map(this::stripDotClass)
        .map(name -> name.replace('/', '.'))
        .map(name -> deobfuscateClassName(name, mapper))
        .map(outputGenerator)
        .sorted()
        .collect(Collectors.toList())
        .forEach(System.out::println);
  }

  public static void main(String[] args) throws Exception {
    new ReadMainDexList().run(args);
  }
}