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Scala example source code file (Lexical.scala)

This example Scala source code file (Lexical.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

char, char, eofch, eofch, lexical, lexical, scanners, scanners, tokens

The Scala Lexical.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2006-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.util.parsing
package combinator
package lexical

import token._
import input.CharArrayReader.EofCh

/** <p>
 *    This component complements the <code>Scanners component with
 *    common operations for lexical parsers.
 *  </p>
 *  <p>
 *   {@see StdLexical} for a concrete implementation for a simple, Scala-like
 *   language.
 *  </p>
 *
 * @author Martin Odersky, Adriaan Moors
 */
abstract class Lexical extends Scanners with Tokens {

  /** A character-parser that matches a letter (and returns it)*/
  def letter = elem("letter", _.isLetter)

  /** A character-parser that matches a digit (and returns it)*/  
  def digit = elem("digit", _.isDigit)

  /** A character-parser that matches any character except the ones given in `cs' (and returns it)*/  
  def chrExcept(cs: Char*) = elem("", ch => (cs forall (ch !=)))

  /** A character-parser that matches a white-space character (and returns it)*/  
  def whitespaceChar = elem("space char", ch => ch <= ' ' && ch != EofCh)
}

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