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IsTag.scala
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IsTag.scala
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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
import cats._
trait IsTag[Tag] extends Eq[Tag] {
/** Indicates whether this tag is open.
* For instance, tags representing integers are open, strings as well.
*/
def isOpen(tag: Tag): Boolean
/** The range of this tag type, i.e. all possible values.
* If the tag is open, returns an empty iterator.
*/
def range(tag: Tag): Iterator[Tag]
final def hasUnmatchedConstructor(skel: Skeleton[_, Tag], matched: Set[Tag]): Boolean =
skel match {
case Skeleton.Constructor(tag, _, _) => isOpen(tag) || range(tag).exists(!matched.contains(_))
case Skeleton.Wildcard(_) => false
case Skeleton.Guard(Some(_)) => true
case Skeleton.Guard(None) => false
}
}