rejected memoize

gistfile1.txt

private[mada] object Memoize {
    def apply[A](p: Peg[A]): Peg[A] = new MemoizePeg(p)
}

private[mada] class MemoizePeg[A](override val self: Peg[A]) extends PegProxy[A] {
    val memoTable = new scala.collection.jcl.HashMap[TripleKey[A], Int]

    override def parse(v: Vector[A], start: Int, end: Int) = {
        val key = new TripleKey(v, start, end)
        val value = memoTable.get(key)
        if (value.isEmpty) {
            val cur = self.parse(v, start, end)
            memoTable.put(key, cur)
            cur
        } else {
            value.get
        }
    }
}