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swift-urlqueryitem-coder Sources URLQueryItemCoder Decoder Generic Implementation DecodingContainer+MultiValue.swift
12 kB · 350 lines
Swift
at main
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import Foundation
extension DecodingContainer { internal final class MultiValue { internal let configuration: DecodingStrategies internal private(set) var children: [String: DecodingContainer<PrimitiveValue>] internal private(set) var codingPath: [any CodingKey] internal private(set) var currentIndex: Int // MARK: Internal Initialization internal init(codingPath: [any CodingKey], configuration: DecodingStrategies) { self.codingPath = codingPath self.configuration = configuration children = [:] currentIndex = 0 } // MARK: Internal Instance Interface internal func set(_ key: String, to child: DecodingContainer<PrimitiveValue>) { precondition(children[key] == nil, "A child already exists for that key.") children[key] = child } // MARK: Private Instance Interface private var endIndex: Int { children.count - 1 } private func childContainer(for key: some CodingKey) throws -> DecodingContainer { let encodedKey = configuration.keyStrategy.encode(key, at: codingPath) guard let childContainer = children[encodedKey.stringValue] else { throw DecodingError.keyNotFound( key, .noValueAssociatedWithKey(at: nextCodingPath(appending: key)) ) } return childContainer } private func singleValueContainer(for key: some CodingKey) throws -> DecodingContainer.SingleValue { switch try childContainer(for: key) { case .multiValue: throw DecodingError.dataCorrupted( DecodingError.Context( codingPath: codingPath, debugDescription: "Cannot decode container as primitive value." ) ) case let .singleValue(singleValueContainer): return singleValueContainer } } // MARK: Private Instance Interface private func nextCodingPath(appending key: some CodingKey) -> [any CodingKey] { var nextCodingPath = codingPath nextCodingPath.append(key) return nextCodingPath } private func nextDecodingKey() -> StringCodingKey { defer { currentIndex += 1 } return StringCodingKey(intValue: currentIndex) } }}
// MARK: - KeyedDecodingContainerProtocol Extension
extension DecodingContainer.MultiValue: KeyedDecodingContainerProtocol { // MARK: Internal Instance Interface internal var allKeys: [StringCodingKey] { children.keys.map(StringCodingKey.init(stringValue:)) } internal func contains(_ key: StringCodingKey) -> Bool { let encodedKey = configuration.keyStrategy.encode(key, at: codingPath) return children[encodedKey.stringValue] != nil } internal func decode(_ type: Bool.Type, forKey key: StringCodingKey) throws -> Bool { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: String.Type, forKey key: StringCodingKey) throws -> String { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Double.Type, forKey key: StringCodingKey) throws -> Double { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Float.Type, forKey key: StringCodingKey) throws -> Float { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Int.Type, forKey key: StringCodingKey) throws -> Int { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Int8.Type, forKey key: StringCodingKey) throws -> Int8 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Int16.Type, forKey key: StringCodingKey) throws -> Int16 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Int32.Type, forKey key: StringCodingKey) throws -> Int32 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: Int64.Type, forKey key: StringCodingKey) throws -> Int64 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: UInt.Type, forKey key: StringCodingKey) throws -> UInt { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: UInt8.Type, forKey key: StringCodingKey) throws -> UInt8 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: UInt16.Type, forKey key: StringCodingKey) throws -> UInt16 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: UInt32.Type, forKey key: StringCodingKey) throws -> UInt32 { try singleValueContainer(for: key).decode(type) } internal func decode(_ type: UInt64.Type, forKey key: StringCodingKey) throws -> UInt64 { try singleValueContainer(for: key).decode(type) } internal func decode<Target>( _ type: Target.Type, forKey key: StringCodingKey ) throws -> Target where Target: Decodable { let childContainer = try childContainer(for: key) let lowLevelDecoder = LowLevelDecoder(container: childContainer) return try lowLevelDecoder.decodeWithSpecialTreatment(as: type) } internal func decodeNil(forKey key: StringCodingKey) throws -> Bool { let encodedKey = configuration.keyStrategy.encode(key, at: codingPath) guard let childContainer = children[encodedKey.stringValue] else { return true } switch childContainer { case .multiValue: return false case let .singleValue(singleValueContainer): return singleValueContainer.decodeNil() } } internal func nestedContainer<NestedKey>( keyedBy type: NestedKey.Type, forKey key: StringCodingKey ) throws -> KeyedDecodingContainer<NestedKey> where NestedKey : CodingKey { switch try childContainer(for: key) { case let .multiValue(multiValueContainer): return KeyedDecodingContainer(multiValueContainer.wrapped()) case let .singleValue(singleValueContainer): return KeyedDecodingContainer(singleValueContainer.wrapped()) } } internal func nestedUnkeyedContainer(forKey key: StringCodingKey) throws -> UnkeyedDecodingContainer { switch try childContainer(for: key) { case let .multiValue(multiValueContainer): return multiValueContainer case let .singleValue(singleValueContainer): return singleValueContainer } } internal func superDecoder() throws -> Decoder { let key = StringCodingKey(stringValue: "super") return try superDecoder(forKey: key) } internal func superDecoder(forKey key: StringCodingKey) throws -> Decoder { let encodedKey = configuration.keyStrategy.encode(key, at: codingPath) guard let childContainer = children[encodedKey.stringValue] else { throw DecodingError.keyNotFound(key, .noValueAssociatedWithKey(at: nextCodingPath(appending: encodedKey))) } return LowLevelDecoder(container: childContainer) }}
// MARK: - SingleValueDecodingContainer
extension DecodingContainer.MultiValue: SingleValueDecodingContainer { // NO-OP}
// MARK: - UnkeyedDecodingContainer Extension
extension DecodingContainer.MultiValue: UnkeyedDecodingContainer { // MARK: Internal Instance Interface internal var count: Int? { children.count } internal var isAtEnd: Bool { endIndex < currentIndex } internal func decode(_ type: Bool.Type) throws -> Bool { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Double.Type) throws -> Double { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Float.Type) throws -> Float { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Int.Type) throws -> Int { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Int8.Type) throws -> Int8 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Int16.Type) throws -> Int16 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Int32.Type) throws -> Int32 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: Int64.Type) throws -> Int64 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: String.Type) throws -> String { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: UInt.Type) throws -> UInt { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: UInt8.Type) throws -> UInt8 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: UInt16.Type) throws -> UInt16 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: UInt32.Type) throws -> UInt32 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode(_ type: UInt64.Type) throws -> UInt64 { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decode<Target>(_ type: Target.Type) throws -> Target where Target: Decodable { let nextCodingKey = nextDecodingKey() return try decode(type, forKey: nextCodingKey) } internal func decodeNil() -> Bool { let nextCodingKey = nextDecodingKey() return (try? decodeNil(forKey: nextCodingKey)) ?? false } internal func nestedContainer<NestedKey>( keyedBy type: NestedKey.Type ) throws -> KeyedDecodingContainer<NestedKey> where NestedKey: CodingKey { let nextCodingKey = nextDecodingKey() return try nestedContainer(keyedBy: type, forKey: nextCodingKey) } internal func nestedUnkeyedContainer() throws -> UnkeyedDecodingContainer { let nextCodingKey = nextDecodingKey() return try nestedUnkeyedContainer(forKey: nextCodingKey) }}