Scala example source code file (NamedParam.scala)

This example Scala source code file (NamedParam.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

any, classtag, compiler, namedparam, namedparamclass, namedparamcreator, nsc, reflection, runtime, string, t, typed, untyped

The NamedParam.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author Paul Phillips
 */

package scala.tools.nsc
package interpreter

import NamedParam._
import scala.language.implicitConversions
import scala.reflect.runtime.{universe => ru}
import scala.reflect.{ClassTag, classTag}
import scala.tools.nsc.typechecker.{ TypeStrings }

trait NamedParamCreator {
  protected def freshName: () => String

  def apply[T: ru.TypeTag : ClassTag](name: String, x: T): NamedParam = new Typed[T](name, x)
  def apply[T: ru.TypeTag : ClassTag](x: T): NamedParam = apply(freshName(), x)
  def clazz(name: String, x: Any): NamedParam = new Untyped(name, x)

  implicit def tuple[T: ru.TypeTag : ClassTag](pair: (String, T)): NamedParam       = apply(pair._1, pair._2)
}

object NamedParam extends NamedParamCreator {
  class Typed[T: ru.TypeTag : ClassTag](val name: String, val value: T) extends NamedParam {
    val tpe = TypeStrings.fromTag[T]
  }
  class Untyped(val name: String, val value: Any) extends NamedParam {
    val tpe = TypeStrings.fromValue(value)
  }

  protected val freshName = {
    var counter = 0
    () => { counter += 1; "p" + counter }
  }
}

case class NamedParamClass(name: String, tpe: String, value: Any) extends NamedParam { }

trait NamedParam {
  def name: String
  def tpe: String
  def value: Any
  override def toString = name + ": " + tpe
}