parser combinator sample

gistfile1.txt

import scala.util.parsing.combinator._

class SampleParsers extends RegexParsers {
  def ok: Parser[Int] = success(0)
  def int: Parser[Int] = """[0-9][0-9]?""".r ^^ { _.toInt }
  def char: Parser[Char] = """[A-z]""".r ^^ { _.charAt(0) }
  def lit: Parser[Int] = "[" ~> int <~ "]"
  def rep0lit = rep(lit)
  def rep1lit = rep1(lit)
}

object Sample extends SampleParsers {
  def main(args: Array[String]) {
    // sbt "run Sample hoge"
    // println(args(0)) // Sample
    // println(args(1)) // hoge
    println(parseAll(ok, "null"))
    println(parseAll(char, "c"))
    println(parseAll(lit, "[0]"))
    println(parseAll(rep0lit, ""))
    println(parseAll(rep0lit, "[3]"))
    println(parseAll(rep0lit, "[3]"))
    println(parseAll(rep1lit, "[10][23]"))
  }
}