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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.pattern

sealed trait Skeleton[Expr, Tag] {
  final def isTrivial: Boolean = this match {
    case Skeleton.Wildcard(_) => true
    case Skeleton.Guard(None) => true
    case _                    => false
  }
}
object Skeleton {
  case class Wildcard[Expr, Tag](hasGuard: Boolean) extends Skeleton[Expr, Tag]
  case class Constructor[Expr, Tag](tag: Tag, args: List[RawSkeleton[Expr, Tag]], hasGuard: Boolean)
      extends Skeleton[Expr, Tag]
  case class Guard[Expr, Tag](guard: Option[Expr]) extends Skeleton[Expr, Tag]
  def noArgConstructor[Expr, Tag](tag: Tag): Skeleton[Expr, Tag] =
    Constructor(tag, Nil, false)
  def wildcard[Expr, Tag]: Skeleton[Expr, Tag] = Wildcard(false)
}