Problem.scala

package wolv.parserlibproblem

import util.parsing.ast.AbstractSyntax
import util.parsing.combinator.syntactical.TokenParsers
import util.parsing.combinator.lexical.Lexical
import util.parsing.combinator.token.Tokens

trait SimpleTokens extends Tokens {
  case class Foo extends Token
  case class Bar extends Token
}

class SimpleLex extends Lexical with SimpleTokens {
}

trait SimpleAst extends AbstractSyntax {
  sealed trait Exp extends Element
  case class Num() extends Exp
  case class Str() extends Exp
}

object MyModel extends SimpleAst {
  object Parser extends TokenParsers {
    type Tokens = SimpleLex

    def parse = Num()
  }

  object PrettyPrinter {
    def print(x: Exp) = 42
  }
}

class Problem extends Application {
  val parser = MyModel.Parser
  val prettyPrinter = MyModel.PrettyPrinter

  println(prettyPrinter.print(parser.parse))
}