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Scala example source code file (Reader.scala)

This example Scala source code file (Reader.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

boolean, boolean, int, int, nosuchmethoderror, nosuchmethoderror, position, reader, reader, t

The Scala Reader.scala source code

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



package scala.util.parsing.input


/** An interface for streams of values that have positions.
 *
 * @author Martin Odersky, Adriaan Moors
 */
abstract class Reader[+T] {

  /** If this is a reader over character sequences, the underlying char sequence 
   *  If not, throws a <code>NoSuchMethodError exception.
   */
  def source: java.lang.CharSequence = 
    throw new NoSuchMethodError("not a char sequence reader")

  def offset: Int =
    throw new NoSuchMethodError("not a char sequence reader")

   /** Returns the first element of the reader
    */
  def first: T

  /** Returns an abstract reader consisting of all elements except the first 
   * 
   * @return If <code>atEnd is true, the result will be
   *         <code>this'; otherwise, it's a Reader containing
   *         more elements.
   */
  def rest: Reader[T]
  
  /** Returns an abstract reader consisting of all elements except the first
   *  <code>n elements.
   */ 
  def drop(n: Int): Reader[T] = {
    var r: Reader[T] = this
    var cnt = n
    while (cnt > 0) {
      r = r.rest; cnt -= 1
    }
    r
  }

  /** The position of the first element in the reader
   */
  def pos: Position

  /** true iff there are no more elements in this reader 
   */
  def atEnd: Boolean
}

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