Scala example source code file (ReplConfig.scala)

This example Scala source code file (ReplConfig.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

any, assertionerror, boolean, boolean, console, replconfig, replprops, string, string, t, t, tapmaker, tapmaker, u

The Scala ReplConfig.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author Paul Phillips
 */
 
package scala.tools.nsc
package interpreter

trait ReplConfig {
  lazy val replProps = new ReplProps
  
  class TapMaker[T](x: T) {
    def tapInfo(msg: => String): T  = tap(x => replinfo(parens(x)))
    def tapDebug(msg: => String): T = tap(x => repldbg(parens(x)))
    def tapTrace(msg: => String): T = tap(x => repltrace(parens(x)))
    def tap[U](f: T => U): T = {
      f(x)
      x
    }
  }

  private def parens(x: Any) = "(" + x + ")"
  private def echo(msg: => String) = 
    try Console println msg
    catch { case x: AssertionError => Console.println("Assertion error printing debugging output: " + x) }
    
  private[nsc] def repldbg(msg: => String)    = if (isReplDebug) echo(msg)
  private[nsc] def repltrace(msg: => String)  = if (isReplTrace) echo(msg)
  private[nsc] def replinfo(msg: => String)   = if (isReplInfo)  echo(msg)

  def isReplTrace: Boolean = replProps.trace
  def isReplDebug: Boolean = replProps.debug || isReplTrace
  def isReplInfo: Boolean  = replProps.info || isReplDebug
  def isReplPower: Boolean = replProps.power
}