1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Async Algorithms open source project
//
// Copyright (c) 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
import AsyncAlgorithms
public struct Validator<Element: Sendable>: Sendable {
private enum Ready {
case idle
case ready
case pending(UnsafeContinuation<Void, Never>)
}
private struct State: Sendable {
var collected = [Element]()
var failure: Error?
var ready: Ready = .idle
}
private struct Envelope<Contents>: @unchecked Sendable {
var contents: Contents
}
private let state = ManagedCriticalState(State())
private func ready(_ apply: (inout State) -> Void) {
state.withCriticalRegion { state -> UnsafeContinuation<Void, Never>? in
apply(&state)
switch state.ready {
case .idle:
state.ready = .ready
return nil
case .pending(let continuation):
state.ready = .idle
return continuation
case .ready:
return nil
}
}?.resume()
}
internal func step() async {
await withUnsafeContinuation { (continuation: UnsafeContinuation<Void, Never>) in
state.withCriticalRegion { state -> UnsafeContinuation<Void, Never>? in
switch state.ready {
case .ready:
state.ready = .idle
return continuation
case .idle:
state.ready = .pending(continuation)
return nil
case .pending:
fatalError()
}
}?.resume()
}
}
let onEvent: (@Sendable (Result<Element?, Error>) async -> Void)?
init(onEvent: @Sendable @escaping (Result<Element?, Error>) async -> Void) {
self.onEvent = onEvent
}
public init() {
self.onEvent = nil
}
public func test<S: AsyncSequence>(_ sequence: S, onFinish: @Sendable @escaping (inout S.AsyncIterator) async -> Void) where S.Element == Element {
let envelope = Envelope(contents: sequence)
Task {
var iterator = envelope.contents.makeAsyncIterator()
ready { _ in }
do {
while let item = try await iterator.next() {
await onEvent?(.success(item))
ready { state in
state.collected.append(item)
}
}
await onEvent?(.success(nil))
} catch {
await onEvent?(.failure(error))
ready { state in
state.failure = error
}
}
ready { _ in }
await onFinish(&iterator)
}
}
public func validate() async -> [Element] {
await step()
return current
}
public var current: [Element] {
return state.withCriticalRegion { state in
return state.collected
}
}
public var failure: Error? {
return state.withCriticalRegion { state in
return state.failure
}
}
}
|
