fs2.data.matching.Table.scala Maven / Gradle / Ivy
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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.matching
/** Represents a lookup table. This is useful to implement
* finite state automata or transducers.
*/
trait Table[T, In, Out] {
def get(table: T)(in: In): Option[Out]
}
object Table extends LowPriorityImplicits {
def apply[T, I, O](implicit ev: Table[T, I, O]): Table[T, I, O] =
ev
implicit def MapTable[K, V]: Table[Map[K, V], K, V] = new Table[Map[K, V], K, V] {
override def get(table: Map[K, V])(in: K): Option[V] = table.get(in)
}
implicit class TableOps[T](val t: T) extends AnyVal {
def get[K, V](in: K)(implicit T: Table[T, K, V]): Option[V] =
T.get(t)(in)
}
}
sealed trait LowPriorityImplicits {
implicit def FunctionTable[I, O]: Table[Function[I, O], I, O] = new Table[Function[I, O], I, O] {
override def get(table: Function[I, O])(in: I): Option[O] = Some(table(in))
}
implicit def PartialFunctionTable[I, O]: Table[PartialFunction[I, O], I, O] = new Table[PartialFunction[I, O], I, O] {
override def get(table: PartialFunction[I, O])(in: I): Option[O] = table.lift(in)
}
}