Scala example source code file (FrontEnd.scala)

This example Scala source code file (FrontEnd.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

enumeration, error, frontend, info, int, position, reflection, severity, string, unit, utilities, warning

The FrontEnd.scala Scala example source code

package scala.tools
package reflect

import scala.reflect.internal.util.Position

trait FrontEnd {
  object severity extends Enumeration
  class Severity(val id: Int) extends severity.Value {
    var count: Int = 0
    override def toString() = this match {
      case INFO => "INFO"
      case WARNING => "WARNING"
      case ERROR => "ERROR"
      case _ => "<unknown>"
    }
  }
  val INFO    = new Severity(0)
  val WARNING = new Severity(1)
  val ERROR   = new Severity(2)

  def hasErrors   = ERROR.count > 0
  def hasWarnings = WARNING.count > 0

  case class Info(pos: Position, msg: String, severity: Severity)
  val infos = new scala.collection.mutable.LinkedHashSet[Info]

  /** Handles incoming info */
  def log(pos: Position, msg: String, severity: Severity) {
    infos += new Info(pos, msg, severity)
    severity.count += 1
    display(infos.last)
  }

  /** Displays incoming info */
  def display(info: Info): Unit

  /** Services a request to drop into interactive mode */
  def interactive(): Unit

  /** Refreshes the UI */
  def flush(): Unit = {}

  /** Resets the reporter */
  def reset(): Unit = {
    INFO.count = 0
    WARNING.count = 0
    ERROR.count = 0
    infos.clear()
  }
}