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package scala.runtime.matching ;
import scala.collection.immutable ;
abstract class NonTerm {
override def toString() = this match {
case TreeNT( i ) => "t"+i;
case h @ HedgeNT( i ) => "h"+i+{ if( h.nullable )"~" else "" };
}
}
/** tree nonterminal. holds set of binding variable indices.
*/
case class TreeNT(i:int) extends NonTerm with Ordered[TreeNT] {
var vset:immutable.Set[Int] = new immutable.TreeSet[Int]() ;
/** vset should be sorted to allow fast lookup */
def this( i:int, vset:immutable.Set[Int] ) = {
this( i );
this.vset = new immutable.TreeSet[Int]() incl vset ;
}
def compareTo [b >: TreeNT <% Ordered[b]](y: b): int = y match {
case TreeNT( y1 ) => i compareTo y1;
case _ => -(y compareTo this)
}
};
/** hedge nonterminals. holds nullable property.
*/
case class HedgeNT(i:int) extends NonTerm with Ordered[HedgeNT] {
var nullable:boolean = false;
def this( i:int, nullable:boolean ) = {
this( i );
this.nullable = nullable;
}
def compareTo [b >: HedgeNT <% Ordered[b]](y: b): int = y match {
case HedgeNT( y1 ) => i compareTo y1;
case _ => -(y compareTo this)
}
};
//case object EMPTYHEDGE extends HedgeNT( 0, true ) ;
//case object ANYHEDGE extends HedgeNT( 1, true ) ;
object ANYTREE extends TreeNT( 1 );
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