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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2006-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.util.parsing.combinator.lexical
import scala.util.parsing.syntax._
import scala.util.parsing.input.CharArrayReader.EofCh
/** <p>
* This component complements the <code>Scanners</code> 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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