90 lines
2.4 KiB
Swift
90 lines
2.4 KiB
Swift
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//===----------------------------------------------------------------------===//
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//
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// This source file is part of the SwiftLibs open source project
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//
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// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
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// Licensed under the EUPL 1.2 or later.
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
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//
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//===----------------------------------------------------------------------===//
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@propertyWrapper
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/// This property wrapper provides a generic type that acts as a thin wrapper around an array of `Elements` instances to allow a lossy decoding and or encoding process.
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public struct LossyCodableList<Element> {
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// MARK: Properties
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private var elements: [Element]
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/// Provides read/write access to the array of `Element` instances.
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public var wrappedValue: [Element] {
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get { elements }
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set { elements = newValue }
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}
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// MARK: Initialisers
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/// Initialises this property wrapper.
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public init() {
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self.elements = []
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}
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}
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// MARK: - Decodable
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extension LossyCodableList: Decodable where Element: Decodable {
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// MARK: Initialisers
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/// Initialises the struct with a lossy decoder.
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/// - Parameter decoder: The decoder to use for the lossy decoder process.
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public init(from decoder: Decoder) throws {
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let container = try decoder.singleValueContainer()
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let wrappers = try container.decode([ElementWrapper].self)
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self.elements = wrappers.compactMap(\.element)
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}
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}
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// MARK: - Encodable
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extension LossyCodableList: Encodable where Element: Encodable {
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// MARK: Functions
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/// Encodes an array of `Element` instances loosely.
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/// - Parameter encoder: The encoder to use for the lossy encoding process.
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public func encode(to encoder: Encoder) throws {
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var container = encoder.unkeyedContainer()
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elements.forEach { element in
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try? container.encode(element)
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}
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}
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}
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// MARK: - Structs
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private extension LossyCodableList where Element: Decodable {
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struct ElementWrapper: Decodable {
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// MARK: Properties
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var element: Element?
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// MARK: Initialisers
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init(from decoder: Decoder) throws {
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let container = try decoder.singleValueContainer()
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self.element = try? container.decode(Element.self)
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}
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}
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}
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