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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2003, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
// needed for variable binding in pattern matching
package scala;
// special sequence list
// run of a left-transducer that tags its input with states
// needed for variable binding during matching
abstract class SeqTrace[A] extends List[Pair[Int,A]] {
/*abstract*/ def isEmpty: Boolean;
/*abstract*/ def head: Pair[Int, A];
/*abstract*/ def headState: Int;
/*abstract*/ def headElem: A;
/*abstract*/ def tail: SeqTrace[A];
/*
override def ::(zI: Int, za: A): SeqTrace[A] =
new SeqTraceCons(zI, za, this);
*/
// why the f&&k do I need the .as cast ?
def add[A](state: Int, value: A): SeqTraceCons[A] =
SeqTraceCons[A](state, value, this.asInstanceOf[SeqTrace[A]]);
// this is copied verbatim from List... and SeqList
/*
def mkString2(start: java.lang.String,
sep: java.lang.String,
end: java.lang.String): java.lang.String =
start +
(if (isEmpty) end
else if (tail.isEmpty) head.toString() + end
else head.toString().concat(sep).concat(
tail.mkString2("", sep, end)));
*/
/* BUG
override def mkString(start: java.lang.String,
sep: java.lang.String,
end: java.lang.String): java.lang.String =
start +
(if (isEmpty) end
else if (tail.isEmpty) head.toString() + end
else head.toString().concat(sep).concat(
tail.mkString("", sep, end)));
*/
}
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