Scala example source code file (ListParsers.scala)

This example Scala source code file (ListParsers.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

array, array, list, list, listparsers, listparsers1, parser, parser, standardtokenparsers, standardtokenparsers

The Scala ListParsers.scala source code

package examples.parsing

import scala.util.parsing.combinator1.syntactical.StandardTokenParsers

object ListParsers extends StandardTokenParsers {   
  lexical.delimiters ++= List("(", ")", ",")

  def expr: Parser[Any] = "(" ~ exprs ~ ")" | ident | numericLit
  def exprs: Parser[Any] = expr ~ rep ("," ~ expr)

  def main(args: Array[String]) {
    val tokens = new lexical.Scanner(args(0))
    println(args(0))
    println(phrase(expr)(tokens))
  }
}

object ListParsers1 extends StandardTokenParsers {   
  lexical.delimiters ++= List("(", ")", ",")

  def expr: Parser[Any] = "(" ~> exprs <~ ")" | ident | numericLit

  def exprs: Parser[List[Any]] = expr ~ rep ("," ~> expr) ^^ { case x ~ y => x :: y }

  def main(args: Array[String]) {
    val tokens = new lexical.Scanner(args(0))
    println(args(0))
    println(phrase(expr)(tokens))
  }
}