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Streaming finite state machines

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/*
 * Copyright 2024 fs2-data Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fs2.data.mft

case class Rules[Guard, InTag, OutTag](nparams: Int, tree: List[(EventSelector[Guard, InTag], Rhs[OutTag])]) {
  def isWildcard: Boolean =
    tree.map(_._1).toSet == Set(EventSelector.AnyLeaf(None),
                                EventSelector.AnyNode(None),
                                EventSelector.Epsilon()) && tree.map(_._2).toSet.size == 1
}