src/main/java/com/android/tools/r8/ExtractR8RulesCommand.java

// Copyright (c) 2024, 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.graph.DexItemFactory;
import com.android.tools.r8.keepanno.annotations.KeepForApi;
import com.android.tools.r8.origin.CommandLineOrigin;
import com.android.tools.r8.utils.AndroidApp;
import com.android.tools.r8.utils.CliParserUtils;
import com.android.tools.r8.utils.InternalOptions;
import com.android.tools.r8.utils.Reporter;
import com.android.tools.r8.utils.StringDiagnostic;
import com.android.tools.r8.utils.internal.CliParser;
import com.android.tools.r8.utils.internal.SemanticVersion;
import java.nio.file.Path;
import java.nio.file.Paths;

@KeepForApi
/** Experimental API to extract embedded rules from libraries. */
public class ExtractR8RulesCommand extends BaseCommand {

  private final StringConsumer rulesConsumer;
  private final boolean includeOriginComments;
  private final SemanticVersion compilerVersion;
  private final DexItemFactory factory;
  private final Reporter reporter;

  @KeepForApi
  public static class Builder extends BaseCommand.Builder<ExtractR8RulesCommand, Builder> {

    private final DexItemFactory factory = new DexItemFactory();
    private StringConsumer rulesConsumer = null;
    private boolean includeOriginComments = false;
    private SemanticVersion compilerVersion = null;

    private Builder() {}

    private Builder(DiagnosticsHandler diagnosticsHandler) {
      super(diagnosticsHandler);
    }

    @Override
    ExtractR8RulesCommand.Builder self() {
      return this;
    }

    /** TBD */
    public ExtractR8RulesCommand.Builder setRulesOutputPath(Path rulesOutputPath) {
      rulesConsumer = new StringConsumer.FileConsumer(rulesOutputPath);
      return self();
    }

    /** TBD */
    public ExtractR8RulesCommand.Builder setRulesConsumer(StringConsumer rulesConsumer) {
      this.rulesConsumer = rulesConsumer;
      return self();
    }

    /** TBD */
    public ExtractR8RulesCommand.Builder setIncludeOriginComments(boolean include) {
      this.includeOriginComments = include;
      return self();
    }

    /** TBD */
    public Builder setCompilerVersion(SemanticVersion version) {
      compilerVersion = version;
      return self();
    }

    @Override
    protected ExtractR8RulesCommand makeCommand() {
      // If printing versions ignore everything else.
      if (isPrintHelp() || isPrintVersion()) {
        return new ExtractR8RulesCommand(isPrintHelp(), isPrintVersion());
      }

      return new ExtractR8RulesCommand(
          factory,
          getAppBuilder().build(),
          rulesConsumer,
          includeOriginComments,
          compilerVersion,
          getReporter());
    }
  }

  static String usageMessage() {
    return CliParserUtils.getUsageMessage(createParser());
  }

  public static ExtractR8RulesCommand.Builder builder() {
    return new ExtractR8RulesCommand.Builder();
  }

  public static ExtractR8RulesCommand.Builder builder(DiagnosticsHandler diagnosticsHandler) {
    return new ExtractR8RulesCommand.Builder(diagnosticsHandler);
  }

  public static ExtractR8RulesCommand.Builder parse(String[] args) {
    var builder = builder();
    createParser()
        .parse(
            args,
            builder,
            err ->
                builder
                    .getReporter()
                    .fatalError(new StringDiagnostic(err, CommandLineOrigin.INSTANCE)));
    return builder;
  }

  public StringConsumer getRulesConsumer() {
    return rulesConsumer;
  }

  public boolean getIncludeOriginComments() {
    return includeOriginComments;
  }

  public SemanticVersion getCompilerVersion() {
    return compilerVersion;
  }

  Reporter getReporter() {
    return reporter;
  }

  private static CliParser<ExtractR8RulesCommand.Builder> createParser() {
    var header = "Usage: TBD";
    var parser = new CliParser<ExtractR8RulesCommand.Builder>(header);
    return parser
        .option1(
            "--rules-output",
            "<file>",
            "Output the extracted keep rules.",
            (b, arg) -> b.setRulesOutputPath(Paths.get(arg)))
        .option1(
            "--compiler-version",
            "<version>",
            "Output the proguard rules extracted.",
            (b, arg) -> b.setCompilerVersion(SemanticVersion.parse(arg)))
        .option0(
            "--include-origin-comments",
            "Include comments with origin for extracted rules.",
            b -> b.setIncludeOriginComments(true))
        .option0("--version", "Print the version.", b -> b.setPrintVersion(true))
        .option0("--help", "Print this message.", b -> b.setPrintHelp(true), "-h")
        .positional((b, arg) -> b.addProgramFiles(Paths.get(arg)));
  }

  private ExtractR8RulesCommand(
      DexItemFactory factory,
      AndroidApp inputApp,
      StringConsumer rulesConsumer,
      boolean includeOriginComments,
      SemanticVersion compilerVersion,
      Reporter reporter) {
    super(inputApp);
    this.factory = factory;
    this.rulesConsumer = rulesConsumer;
    this.includeOriginComments = includeOriginComments;
    this.compilerVersion = compilerVersion;
    this.reporter = reporter;
  }

  private ExtractR8RulesCommand(boolean printHelp, boolean printVersion) {
    super(printHelp, printVersion);
    this.factory = new DexItemFactory();
    this.rulesConsumer = null;
    this.includeOriginComments = false;
    this.compilerVersion = null;
    this.reporter = new Reporter();
  }

  @Override
  InternalOptions getInternalOptions() {
    InternalOptions internal = new InternalOptions(factory, reporter);
    internal.programConsumer = DexIndexedConsumer.emptyConsumer();
    assert internal.retainCompileTimeAnnotations;
    internal.retainCompileTimeAnnotations = false;
    return internal;
  }
}