smithy4s.capability.instances.option.scala Maven / Gradle / Ivy
/*
* Copyright 2021-2024 Disney Streaming
*
* Licensed under the Tomorrow Open Source Technology License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://disneystreaming.github.io/TOST-1.0.txt
*
* 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 smithy4s.capability
package instances
object option {
implicit val optionZipper: Zipper[Option] =
new Zipper[Option] {
def pure[A](a: A): Option[A] = Some(a)
override def zipMap[A, B, C](fa: Option[A], fb: Option[B])(
f: (A, B) => C
): Option[C] = (fa, fb) match {
case (None, _) => None
case (_, None) => None
case (Some(a), Some(b)) => Some(f(a, b))
}
override def zipMapAll[A](
seq: IndexedSeq[Option[Any]]
)(f: IndexedSeq[Any] => A): Option[A] = {
val builder = IndexedSeq.newBuilder[Any]
var i = 0
var error: Boolean = false
while (!error && i < seq.size) {
seq(i) match {
case None => error = true
case Some(r) => builder += r
}
i += 1
}
if (error) None
else Some(f(builder.result()))
}
}
}