path: root/sources/scala/tools/nsc/Main.scala

/* NSC -- new scala compiler
 * Copyright 2005 LAMP/EPFL
 * @author  Martin Odersky
 */
// $Id$
package scala.tools.nsc;

import scala.tools.nsc.util.{Position};
import scala.tools.nsc.reporters.{Reporter, ConsoleReporter};

/** The main class for NSC, a compiler for the programming
 *  language Scala.
 */
object Main extends Object with EvalLoop {

  val PRODUCT: String =
    System.getProperty("scala.product", "scalac");
  val VERSION: String =
    System.getProperty("scala.version", "unknown version");
  val versionMsg = PRODUCT + " " + VERSION + " -- (c) 2002-05 LAMP/EPFL";
  val prompt = "\nnsc> ";

  private var reporter: ConsoleReporter = _;

  def error(msg: String): unit =
    reporter.error(new Position(PRODUCT),
                   msg + "\n  " + PRODUCT + " -help  gives more information");

  def errors() = reporter.errors();

  def resident(compiler: Global): unit = {
    loop(line => {
      val args = List.fromString(line, ' ');
      val command = new CompilerCommand(args, error, true);
      (new compiler.Run) compile command.files
    })
  }

  def process(args: Array[String]): unit = {
    reporter = new ConsoleReporter();
    val command = new CompilerCommand(List.fromArray(args), error, false);
    reporter.prompt(command.settings.prompt.value);
    if (command.settings.version.value)
      reporter.info(null, versionMsg, true)
    else if (command.settings.help.value)
      reporter.info(null, command.usageMsg, true)
    else {
      try {
        val compiler = new Global(command.settings, reporter);
        if (command.settings.resident.value)
          resident(compiler);
        else if (command.files.isEmpty)
            reporter.info(null, command.usageMsg, true)
        else
          (new compiler.Run) compile command.files;
      } catch {
        case ex @ FatalError(msg) =>
          if (command.settings.debug.value)
            ex.printStackTrace();
        reporter.error(null, "fatal error: " + msg);
      }
      reporter.printSummary()
    }
  }

  def main(args: Array[String]): unit = {
    process(args);
    System.exit(if (reporter.errors() > 0) 1 else 0);
  }

}