stdtokens.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 36 行

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2006-2007, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala.util.parsing.syntax

/** This component provides the standard `Token's for a simple, Scala-like language. 
 *
 * @author Martin Odersky, Adriaan Moors
 */
trait StdTokens extends Tokens {
  /** The class of keyword tokens */
  case class Keyword(chars: String) extends Token {
    override def toString = "`"+chars+"'"
  }

  /** The class of numeric literal tokens */
  case class NumericLit(chars: String) extends Token {
    override def toString = chars
  }

  /** The class of string literal tokens */
  case class StringLit(chars: String) extends Token {
    override def toString = "\""+chars+"\""
  }    

  /** The class of identifier tokens */
  case class Identifier(chars: String) extends Token {
    override def toString = "identifier "+chars
  }
}