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Scala example source code file (Spec.scala)

This example Scala source code file (Spec.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

accumulator, choices, fromstring, fromstring, info, info, list, optionmagic, spec, spec, string, string, t, unit

The Scala Spec.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author  Paul Phillips
 */

package scala.tools
package cmd

/** This trait works together with others in scala.tools.cmd to allow
 *  declaratively specifying a command line program, with many attendant
 *  benefits.  See scala.tools.cmd.DemoSpec for an example.
 */
trait Spec {
  def referenceSpec: Reference
  def programInfo: Spec.Info
  
  protected def help(str: => String): Unit
  protected def heading(str: => String): Unit = help("\n  " + str)

  type OptionMagic <: Opt.Implicit
  protected implicit def optionMagicAdditions(s: String): OptionMagic
}

object Spec {
  class Info(
    val runner: String, 
    val usage: String,
    val mainClass: String
  )
  object Info {
    def apply(runner: String, help: String, mainClass: String): Info = new Info(runner, help, mainClass)
  }
  
  class Accumulator[T: FromString]() {
    private var _buf: List[T] = Nil

    def convert(s: String)    = implicitly[FromString[T]] apply s
    def apply(s: String): T   = returning(convert(s))(_buf +:= _)

    lazy val get = _buf
  }

  class Choices[T: FromString](val xs: List[T]) {
    def fs: FromString[T] = implicitly[FromString[T]]
    def contains(x: T)    = xs contains x
    override def toString = xs.mkString("{ ", ", ", " }")
  }
  
  class EnvironmentVar(val name: String) {
    override def toString = "${%s}" format name
  }
}

Other Scala examples (source code examples)

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