Scala example source code file (Interpolation.scala)

This example Scala source code file (Interpolation.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

alloptions, comp_words, compreply, interpolation, mainclass, map, program, spec, string, w

The Interpolation.scala Scala example source code

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

package scala
package tools
package cmd

/** Interpolation logic for generated files.  The idea is to be
 *  able to write in terms of @@THIS@@ and @@THAT@@ and the reference
 *  specification knows enough to perform the substitutions.  Warrants
 *  expansion.
 */
trait Interpolation {
  self: Spec =>

  private lazy val reference = referenceSpec
  import reference._

  object interpolate {
    def mapper: Map[String, () => String] = Map(
      "PROGRAM"       -> (() => programInfo.runner),
      "ALLOPTIONS"    -> (() => options.all mkString " "),
      "MAINCLASS"     -> (() => programInfo.mainClass)
    )

    private def mark(key: String) = "@@" + key + "@@"
    def apply(template: String) = mapper.foldLeft(template) { case (s, (key, f)) => s.replaceAll(mark(key), f()) }
  }
}

object Interpolation {
  /** A simple template for generating bash completion functions.
   */
  lazy val bashTemplate = """
    |_@@PROGRAM@@()
    |{
    |  local cur opts base
    |  COMPREPLY=()
    |  cur="${COMP_WORDS[COMP_CWORD]}"
    |  opts="@@ALLOPTIONS@@"
    |
    |  COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
    |  _filedir
    |  return 0
    |} && complete -F _@@PROGRAM@@ @@PROGRAM@@
  """.stripMargin

  /** A simple template for generating a runner script.
   */
  val runnerTemplate = """
    |#!/bin/sh
    |#
    |
    |scala @@MAINCLASS@@ "$@"
    |""".stripMargin.trim + "\n"
}