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Publisher.swift.mustache
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Publisher.swift.mustache
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//
// Copyright 2021 Mikołaj Leszczyński & Appmattus Limited
//
// 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.
//
import Foundation
import Combine
import {{frameworkName}}
public extension Kotlinx_coroutines_coreFlow {
func asPublisher<T: AnyObject>() -> AnyPublisher<T, Never> {
(FlowPublisher(flow: self) as FlowPublisher<T>).eraseToAnyPublisher()
}
}
private struct FlowPublisher<T: Any>: Publisher {
public typealias Output = T
public typealias Failure = Never
private let flow: Kotlinx_coroutines_coreFlow
public init(flow: Kotlinx_coroutines_coreFlow) {
self.flow = flow
}
public func receive<S: Subscriber>(subscriber: S) where S.Input == T, S.Failure == Failure {
let subscription = FlowSubscription(flow: flow, subscriber: subscriber)
subscriber.receive(subscription: subscription)
}
final class FlowSubscription<S: Subscriber>: Subscription where S.Input == T, S.Failure == Failure {
private var subscriber: S?
private var job: Kotlinx_coroutines_coreJob?
private let flow: Kotlinx_coroutines_coreFlow
init(flow: Kotlinx_coroutines_coreFlow, subscriber: S) {
self.flow = flow
self.subscriber = subscriber
job = SubscribeKt.subscribe(
flow,
onEach: { position in if let position = position as? T { _ = subscriber.receive(position) }},
onComplete: { subscriber.receive(completion: .finished) },
onThrow: { error in debugPrint(error) }
)
}
func cancel() {
subscriber = nil
job?.cancel(cause: nil)
}
func request(_ demand: Subscribers.Demand) {
}
}
}