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Merge pull request #1 from drekka/develop
Updates to property wrappers.
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27 changes: 27 additions & 0 deletions
27
Sources/Property wrappers/CodableAsEpochMilliseconds.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // | ||
| // EpochDay.swift | ||
| // | ||
| // | ||
| // Created by Derek Clarkson on 9/1/2024. | ||
| // | ||
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| import Foundation | ||
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| /// Identifies a ``Day`` property that reads and writes from an epoch time value expressed in seconds. | ||
| @propertyWrapper | ||
| public struct CodableAsEpochMilliseconds<T>: Codable where T: EpochCodable { | ||
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| public var wrappedValue: T | ||
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| public init(wrappedValue: T) { | ||
| self.wrappedValue = wrappedValue | ||
| } | ||
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| public init(from decoder: Decoder) throws { | ||
| wrappedValue = try T(epochDecoder: decoder, factor: 0.001) | ||
| } | ||
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| public func encode(to encoder: Encoder) throws { | ||
| try wrappedValue.encode(epochEncoder: encoder, factor: 0.001) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| // | ||
| // DayCodable.swift | ||
| // | ||
| // | ||
| // Created by Derek Clarkson on 9/1/2024. | ||
| // | ||
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| import Foundation | ||
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| /// Protocol that allows us to abstract the differences between ``Day`` and ``Day?``. | ||
| /// | ||
| /// By using this protocols for property wrappers we can reduce the number of wrappers needed because | ||
| /// it erases the optional aspect of the values. | ||
| public protocol EpochCodable { | ||
| init(epochDecoder decoder: Decoder, factor: Double) throws | ||
| func encode(epochEncoder encoder: Encoder, factor: Double) throws | ||
| } | ||
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| extension Day: EpochCodable { | ||
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| public init(epochDecoder decoder: Decoder, factor: Double) throws { | ||
| let container = try decoder.singleValueContainer() | ||
| guard let epochTime = try? container.decode(TimeInterval.self) else { | ||
| let context = DecodingError.Context(codingPath: decoder.codingPath, debugDescription: "Unable to read a Day value, expected an epoch.") | ||
| throw DecodingError.dataCorrupted(context) | ||
| } | ||
| self = Day(date: Date(timeIntervalSince1970: epochTime * factor)) | ||
| } | ||
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| public func encode(epochEncoder encoder: Encoder, factor: Double) throws { | ||
| var container = encoder.singleValueContainer() | ||
| try container.encode(date().timeIntervalSince1970 / factor) | ||
| } | ||
| } | ||
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| /// `Day?` support which mostly just handles `nil` before calling the main ``Day`` codable code. | ||
| extension Day?: EpochCodable { | ||
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| public init(epochDecoder decoder: Decoder, factor: Double) throws { | ||
| let container = try decoder.singleValueContainer() | ||
| self = container.decodeNil() ? nil : try Day(epochDecoder: decoder, factor: factor) | ||
| } | ||
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| public func encode(epochEncoder encoder: Encoder, factor: Double) throws { | ||
| if let self { | ||
| try self.encode(epochEncoder: encoder, factor: factor) | ||
| } else { | ||
| var container = encoder.singleValueContainer() | ||
| try container.encodeNil() | ||
| } | ||
| } | ||
| } |
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