public static String build(Task task, List<File> inputs) {
  List<SourceFile> externs;
  try {
    externs = CommandLineRunner.getDefaultExterns();
  } catch (IOException e) {
    throw new BuildException(e);
  }

  List<SourceFile> jsInputs = new ArrayList<SourceFile>();
  for (File f : inputs) {
    jsInputs.add(SourceFile.fromFile(f));
  }

  CompilerOptions options = new CompilerOptions();
  CompilationLevel.ADVANCED_OPTIMIZATIONS
      .setOptionsForCompilationLevel(options);
  WarningLevel.VERBOSE.setOptionsForWarningLevel(options);
  for (DiagnosticGroup dg : diagnosticGroups) {
    options.setWarningLevel(dg, CheckLevel.ERROR);
  }

  options.setCodingConvention(new GoogleCodingConvention());

  Compiler compiler = new Compiler();
  MessageFormatter formatter =
      options.errorFormat.toFormatter(compiler, false);
  AntErrorManager errorManager = new AntErrorManager(formatter, task);
  compiler.setErrorManager(errorManager);

  Result r = compiler.compile(externs, jsInputs, options);
  if (!r.success) {
    return null;
  }

  String wrapped = "(function(){" + compiler.toSource() + "})();\n";
  return wrapped;
}
 

private Compiler createCompiler(CompilerOptions options) {
  Compiler compiler = new Compiler();
  MessageFormatter formatter =
      options.errorFormat.toFormatter(compiler, false);
  AntErrorManager errorManager = new AntErrorManager(formatter, this);
  compiler.setErrorManager(errorManager);
  return compiler;
}
 

public GentsErrorManager(PrintStream stream, MessageFormatter formatter, boolean debug) {
  super(formatter, stream);
  this.debug = debug;
}
 

ClutzErrorManager(PrintStream stream, MessageFormatter formatter, boolean debug) {
  super(formatter, stream);
  this.debug = debug;
}
 

public AntErrorManager(MessageFormatter formatter, Task task) {
  this.formatter = formatter;
  this.task = task;
}