274 lines
8.3 KiB
Swift
274 lines
8.3 KiB
Swift
#if canImport(Foundation)
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import Foundation
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#endif
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/**
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A type-erased `Encodable` value.
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The `AnyEncodable` type forwards encoding responsibilities
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to an underlying value, hiding its specific underlying type.
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You can encode mixed-type values in dictionaries
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and other collections that require `Encodable` conformance
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by declaring their contained type to be `AnyEncodable`:
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let dictionary: [String: AnyEncodable] = [
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"boolean": true,
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"integer": 1,
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"double": 3.141592653589793,
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"string": "string",
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"array": [1, 2, 3],
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"nested": [
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"a": "alpha",
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"b": "bravo",
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"c": "charlie"
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]
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]
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let encoder = JSONEncoder()
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let json = try! encoder.encode(dictionary)
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*/
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#if swift(>=5.1)
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@frozen public struct AnyEncodable: Encodable {
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public let value: Any
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public init<T>(_ value: T?) {
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self.value = value ?? ()
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}
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}
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#else
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public struct AnyEncodable: Encodable {
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public let value: Any
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public init<T>(_ value: T?) {
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self.value = value ?? ()
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}
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}
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#endif
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#if swift(>=4.2)
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@usableFromInline
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protocol _AnyEncodable {
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var value: Any { get }
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init<T>(_ value: T?)
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}
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#else
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protocol _AnyEncodable {
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var value: Any { get }
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init<T>(_ value: T?)
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}
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#endif
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extension AnyEncodable: _AnyEncodable {}
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// MARK: - Encodable
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extension _AnyEncodable {
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public func encode(to encoder: Encoder) throws {
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var container = encoder.singleValueContainer()
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switch value {
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#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
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case let number as NSNumber:
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try encode(nsnumber: number, into: &container)
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#endif
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#if canImport(Foundation)
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case is NSNull:
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try container.encodeNil()
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#endif
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case is Void:
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try container.encodeNil()
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case let bool as Bool:
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try container.encode(bool)
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case let int as Int:
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try container.encode(int)
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case let int8 as Int8:
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try container.encode(int8)
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case let int16 as Int16:
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try container.encode(int16)
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case let int32 as Int32:
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try container.encode(int32)
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case let int64 as Int64:
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try container.encode(int64)
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case let uint as UInt:
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try container.encode(uint)
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case let uint8 as UInt8:
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try container.encode(uint8)
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case let uint16 as UInt16:
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try container.encode(uint16)
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case let uint32 as UInt32:
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try container.encode(uint32)
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case let uint64 as UInt64:
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try container.encode(uint64)
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case let float as Float:
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try container.encode(float)
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case let double as Double:
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try container.encode(double)
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case let string as String:
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try container.encode(string)
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#if canImport(Foundation)
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case let date as Date:
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try container.encode(date)
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case let url as URL:
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try container.encode(url)
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#endif
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case let array as [Any?]:
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try container.encode(array.map { AnyEncodable($0) })
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case let dictionary as [String: Any?]:
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try container.encode(dictionary.mapValues { AnyEncodable($0) })
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case let enc as Encodable:
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//try container.encode(enc)
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try enc.encode(to: encoder)
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default:
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let context = EncodingError.Context(codingPath: container.codingPath, debugDescription: "AnyEncodable value cannot be encoded")
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throw EncodingError.invalidValue(value, context)
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}
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}
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#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
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private func encode(nsnumber: NSNumber, into container: inout SingleValueEncodingContainer) throws {
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switch CFNumberGetType(nsnumber) {
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case .charType:
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try container.encode(nsnumber.boolValue)
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case .sInt8Type:
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try container.encode(nsnumber.int8Value)
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case .sInt16Type:
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try container.encode(nsnumber.int16Value)
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case .sInt32Type:
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try container.encode(nsnumber.int32Value)
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case .sInt64Type:
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try container.encode(nsnumber.int64Value)
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case .shortType:
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try container.encode(nsnumber.uint16Value)
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case .longType:
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try container.encode(nsnumber.uint32Value)
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case .longLongType:
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try container.encode(nsnumber.uint64Value)
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case .intType, .nsIntegerType, .cfIndexType:
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try container.encode(nsnumber.intValue)
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case .floatType, .float32Type:
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try container.encode(nsnumber.floatValue)
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case .doubleType, .float64Type, .cgFloatType:
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try container.encode(nsnumber.doubleValue)
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#if swift(>=5.0)
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@unknown default:
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let context = EncodingError.Context(codingPath: container.codingPath, debugDescription: "NSNumber cannot be encoded because its type is not handled")
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throw EncodingError.invalidValue(nsnumber, context)
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#endif
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}
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}
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#endif
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}
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extension AnyEncodable: Equatable {
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public static func == (lhs: AnyEncodable, rhs: AnyEncodable) -> Bool {
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switch (lhs.value, rhs.value) {
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case is (Void, Void):
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return true
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case let (lhs as Bool, rhs as Bool):
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return lhs == rhs
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case let (lhs as Int, rhs as Int):
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return lhs == rhs
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case let (lhs as Int8, rhs as Int8):
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return lhs == rhs
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case let (lhs as Int16, rhs as Int16):
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return lhs == rhs
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case let (lhs as Int32, rhs as Int32):
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return lhs == rhs
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case let (lhs as Int64, rhs as Int64):
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return lhs == rhs
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case let (lhs as UInt, rhs as UInt):
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return lhs == rhs
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case let (lhs as UInt8, rhs as UInt8):
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return lhs == rhs
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case let (lhs as UInt16, rhs as UInt16):
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return lhs == rhs
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case let (lhs as UInt32, rhs as UInt32):
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return lhs == rhs
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case let (lhs as UInt64, rhs as UInt64):
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return lhs == rhs
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case let (lhs as Float, rhs as Float):
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return lhs == rhs
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case let (lhs as Double, rhs as Double):
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return lhs == rhs
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case let (lhs as String, rhs as String):
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return lhs == rhs
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case let (lhs as [String: AnyEncodable], rhs as [String: AnyEncodable]):
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return lhs == rhs
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case let (lhs as [AnyEncodable], rhs as [AnyEncodable]):
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return lhs == rhs
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default:
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return false
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}
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}
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}
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extension AnyEncodable: CustomStringConvertible {
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public var description: String {
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switch value {
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case is Void:
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return String(describing: nil as Any?)
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case let value as CustomStringConvertible:
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return value.description
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default:
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return String(describing: value)
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}
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}
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}
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extension AnyEncodable: CustomDebugStringConvertible {
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public var debugDescription: String {
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switch value {
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case let value as CustomDebugStringConvertible:
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return "AnyEncodable(\(value.debugDescription))"
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default:
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return "AnyEncodable(\(description))"
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}
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}
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}
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extension AnyEncodable: ExpressibleByNilLiteral {}
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extension AnyEncodable: ExpressibleByBooleanLiteral {}
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extension AnyEncodable: ExpressibleByIntegerLiteral {}
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extension AnyEncodable: ExpressibleByFloatLiteral {}
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extension AnyEncodable: ExpressibleByStringLiteral {}
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#if swift(>=5.0)
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extension AnyEncodable: ExpressibleByStringInterpolation {}
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#endif
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extension AnyEncodable: ExpressibleByArrayLiteral {}
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extension AnyEncodable: ExpressibleByDictionaryLiteral {}
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extension _AnyEncodable {
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public init(nilLiteral _: ()) {
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self.init(nil as Any?)
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}
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public init(booleanLiteral value: Bool) {
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self.init(value)
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}
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public init(integerLiteral value: Int) {
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self.init(value)
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}
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public init(floatLiteral value: Double) {
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self.init(value)
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}
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public init(extendedGraphemeClusterLiteral value: String) {
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self.init(value)
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}
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public init(stringLiteral value: String) {
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self.init(value)
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}
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public init(arrayLiteral elements: Any...) {
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self.init(elements)
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}
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public init(dictionaryLiteral elements: (AnyHashable, Any)...) {
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self.init([AnyHashable: Any](elements, uniquingKeysWith: { first, _ in first }))
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}
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}
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