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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2006-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */


package scala.util.parsing.input

/** An object encapsulating basic character constants.
*
* @author Martin Odersky, Adriaan Moors
*/
object CharSequenceReader {
  final val EofCh = '\032'
}

/** A character array reader reads a stream of characters (keeping track of their positions)
* from an array.
*
* @param source the source sequence
* @param offset starting offset.
*
* @author Martin Odersky
*/
class CharSequenceReader(override val source: java.lang.CharSequence,
                         override val offset: Int) extends Reader[Char] {
  import CharSequenceReader._

  /** Construct a `CharSequenceReader` with its first element at
* `source(0)` and position `(1,1)`.
*/
  def this(source: java.lang.CharSequence) = this(source, 0)

  /** Returns the first element of the reader, or EofCh if reader is at its end.
*/
  def first =
    if (offset < source.length) source.charAt(offset) else EofCh

  /** Returns a CharSequenceReader consisting of all elements except the first.
*
* @return If `atEnd` is `true`, the result will be `this`;
* otherwise, it's a `CharSequenceReader` containing the rest of input.
*/
  def rest: CharSequenceReader =
    if (offset < source.length) new CharSequenceReader(source, offset + 1)
    else this

  /** The position of the first element in the reader.
*/
  def pos: Position = new OffsetPosition(source, offset)

  /** true iff there are no more elements in this reader (except for trailing
* EofCh's)
*/
  def atEnd = offset >= source.length

  /** Returns an abstract reader consisting of all elements except the first
* `n` elements.
*/
  override def drop(n: Int): CharSequenceReader =
    new CharSequenceReader(source, offset + n)
}
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