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Refactor Metadata type into conforming to Codable (#6)
Co-authored-by: Pawel Gil <>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,206 @@ | ||
| public struct AnyJson: Codable { | ||
| private var store: [String: Any] | ||
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|
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| public init(_ dict: [String: Any] = [:]) { | ||
| self.store = dict | ||
| } | ||
|
|
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| public subscript(key: String) -> Any? { | ||
| get { store[key] } | ||
| set { store[key] = newValue } | ||
| } | ||
|
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| public var keys: Dictionary<String, Any>.Keys { | ||
| store.keys | ||
| } | ||
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| // MARK: Decoding | ||
|
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| public init(from decoder: Decoder) throws { | ||
| var container = try decoder.container(keyedBy: JSONCodingKey.self) | ||
| self.store = try Self.decodeDictionary(from: &container) | ||
| } | ||
|
|
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| static func decodeDictionary(from container: inout KeyedDecodingContainer<JSONCodingKey>) throws -> [String: Any] { | ||
| var dict = [String: Any]() | ||
| for key in container.allKeys { | ||
| let value = try decode(from: &container, forKey: key) | ||
| dict[key.stringValue] = value | ||
| } | ||
| return dict | ||
| } | ||
|
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| static func decodeArray(from container: inout UnkeyedDecodingContainer) throws -> [Any] { | ||
| var arr: [Any] = [] | ||
| while !container.isAtEnd { | ||
| let value = try decode(from: &container) | ||
| arr.append(value) | ||
| } | ||
| return arr | ||
| } | ||
|
|
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| static func decode(from container: inout KeyedDecodingContainer<JSONCodingKey>, forKey key: JSONCodingKey) throws -> Any { | ||
| if let value = try? container.decode(Bool.self, forKey: key) { | ||
| return value | ||
| } | ||
| if let value = try? container.decode(Int.self, forKey: key) { | ||
| return value | ||
| } | ||
| if let value = try? container.decode(Double.self, forKey: key) { | ||
| return value | ||
| } | ||
| if let value = try? container.decode(String.self, forKey: key) { | ||
| return value | ||
| } | ||
| if let value = try? container.decodeNil(forKey: key) { | ||
| if value { return Optional<Any>.none as Any } | ||
| } | ||
| if var container = try? container.nestedUnkeyedContainer(forKey: key) { | ||
| return try decodeArray(from: &container) | ||
| } | ||
| if var container = try? container.nestedContainer(keyedBy: JSONCodingKey.self, forKey: key) { | ||
| return try decodeDictionary(from: &container) | ||
| } | ||
| throw DecodingError.typeMismatch(AnyJson.self, .init(codingPath: container.codingPath, | ||
| debugDescription: "Couldn't parse object to Metadata: unknown type!")) | ||
| } | ||
|
|
||
| static func decode(from container: inout UnkeyedDecodingContainer) throws -> Any { | ||
| if let value = try? container.decode(Bool.self) { | ||
| return value | ||
| } | ||
| if let value = try? container.decode(Int.self) { | ||
| return value | ||
| } | ||
| if let value = try? container.decode(Double.self) { | ||
| return value | ||
| } | ||
| if let value = try? container.decode(String.self) { | ||
| return value | ||
| } | ||
| if let value = try? container.decodeNil() { | ||
| if value { return Optional<Any>.none as Any } | ||
| } | ||
| if var container = try? container.nestedUnkeyedContainer() { | ||
| return try decodeArray(from: &container) | ||
| } | ||
| if var container = try? container.nestedContainer(keyedBy: JSONCodingKey.self) { | ||
| return try decodeDictionary(from: &container) | ||
| } | ||
| throw DecodingError.typeMismatch(AnyJson.self, .init(codingPath: container.codingPath, | ||
| debugDescription: "Couldn't parse object to Metadata: decoding from container failed")) | ||
| } | ||
|
|
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| // MARK: Encoding | ||
|
|
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| public func encode(to encoder: Swift.Encoder) throws { | ||
| var container = encoder.container(keyedBy: JSONCodingKey.self) | ||
| try Self.encode(to: &container, dictionary: store) | ||
| } | ||
|
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| static func encode(to container: inout KeyedEncodingContainer<JSONCodingKey>, dictionary: [String: Any]) throws { | ||
| for (key, value) in dictionary { | ||
| let key = JSONCodingKey(stringValue: key)! | ||
| if let value = value as? Bool { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? Int { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? Int16 { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? Int32 { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? Int64 { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? Double { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? String { | ||
| try container.encode(value, forKey: key) | ||
| } else if let value = value as? [Any] { | ||
| var container = container.nestedUnkeyedContainer(forKey: key) | ||
| try encode(to: &container, array: value) | ||
| } else if let value = value as? [String: Any] { | ||
| var container = container.nestedContainer(keyedBy: JSONCodingKey.self, forKey: key) | ||
| try encode(to: &container, dictionary: value) | ||
| } else if let value = value as? AnyJson { | ||
| var container = container.nestedContainer(keyedBy: JSONCodingKey.self, forKey: key) | ||
| try encode(to: &container, dictionary: value.store) | ||
| } else { | ||
| if case Optional<Any>.none = value { | ||
| try container.encodeNil(forKey: key) | ||
| } else { | ||
| throw DecodingError.typeMismatch(AnyJson.self, .init(codingPath: container.codingPath, | ||
| debugDescription: "Couldn't parse object to Metadata: unexpected type to encode: \(String(describing: value))")) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| static func encode(to container: inout UnkeyedEncodingContainer, array: [Any]) throws { | ||
| for value in array { | ||
| if let value = value as? Bool { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int32 { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int64 { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int16 { | ||
| try container.encode(value) | ||
| } else if let value = value as? Double { | ||
| try container.encode(value) | ||
| } else if let value = value as? String { | ||
| try container.encode(value) | ||
| } else if let value = value as? [Any] { | ||
| var container = container.nestedUnkeyedContainer() | ||
| try encode(to: &container, array: value) | ||
| } else if let value = value as? [String: Any] { | ||
| var container = container.nestedContainer(keyedBy: JSONCodingKey.self) | ||
| try encode(to: &container, dictionary: value) | ||
| } else { | ||
| if case Optional<Any>.none = value { | ||
| try container.encodeNil() | ||
| } else { | ||
| throw DecodingError.typeMismatch(AnyJson.self, .init(codingPath: container.codingPath, | ||
| debugDescription: "Couldn't parse object to Metadata: unexpected type to encode: \(String(describing: value))")) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| static func encode(to container: inout SingleValueEncodingContainer, value: Any) throws { | ||
| if let value = value as? Bool { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int32 { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int64 { | ||
| try container.encode(value) | ||
| } else if let value = value as? Int16 { | ||
| try container.encode(value) | ||
| } else if let value = value as? Double { | ||
| try container.encode(value) | ||
| } else if let value = value as? String { | ||
| try container.encode(value) | ||
| } else { | ||
| if case Optional<Any>.none = value { | ||
| try container.encodeNil() | ||
| } else { | ||
| throw DecodingError.typeMismatch(AnyJson.self, .init(codingPath: container.codingPath, | ||
| debugDescription: "Couldn't parse object to Metadata: unexpected type to encode: \(String(describing: value))")) | ||
| } | ||
| } | ||
| } | ||
|
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| // MARK: Coding keys | ||
|
|
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| class JSONCodingKey : CodingKey { | ||
| let key: String | ||
| required init?(intValue: Int) { return nil } | ||
| required init?(stringValue: String) { key = stringValue } | ||
| var intValue: Int? { return nil } | ||
| var stringValue: String { return key } | ||
| } | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1 @@ | ||
| /// By default swift is not able to decode type of [String: Any] as | ||
| /// `Any` is not decodable. For now we will assume that the metadata is a dictionary | ||
| /// consisting of keys and values all being strings. Once this is wrong please consider | ||
| /// refactoring the json serialization/deserialization or consider making the related type explicit. | ||
| public typealias Metadata = [String: String] | ||
| public typealias Metadata = AnyJson |