lingua.cascade.Transformer.scala Maven / Gradle / Ivy
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/* Copyright (c) 2018 Lucas Satabin
*
* 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 lingua
package cascade
/** A transformer is used to process stream and transform into
* another stream of data.
*/
abstract class Transformer[-In, +Out] {
self =>
/** Transforms the input stream into an output stream
* according to the semantics of this transformer.
*/
def transform(s: Stream[In]): Stream[Out]
def andThen[Out1](that: Transformer[Out, Out1]): Transformer[In, Out1]
@inline
def ~>:[In1, In2 <: In, Ctx](layer: Layer[In1, In2, Ctx]): Transformer[In1, Out] =
layer.andThen(this)
}