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GeezerVison is showing github.com — JavaScriptKit/Sources/JavaScriptKit/JSValueDecoder.swift at main · yonihemi/JavaScriptKit Expand file tree/ Copy pathJSValueDecoder.swiftMore file actions 250 lines (201 loc) · 8.16 KB / Copy pathJSValueDecoder.swiftFile metadata and controls250 lines (201 loc) · 8.16 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 private struct _Decoder: Decoder { fileprivate let node: JSValue init(referencing node: JSValue, userInfo: [CodingUserInfoKey: Any], codingPath: [CodingKey] = []) { self.node = node self.userInfo = userInfo self.codingPath = codingPath } let codingPath: [CodingKey] let userInfo: [CodingUserInfoKey: Any] func container<Key>(keyedBy _: Key.Type) throws -> KeyedDecodingContainer<Key> where Key: CodingKey { guard let ref = node.object else { throw _typeMismatch(at: codingPath, JSObject.self, reality: node) } return KeyedDecodingContainer(_KeyedDecodingContainer(decoder: self, ref: ref)) } func unkeyedContainer() throws -> UnkeyedDecodingContainer { guard let ref = node.object else { throw _typeMismatch(at: codingPath, JSObject.self, reality: node) } return _UnkeyedDecodingContainer(decoder: self, ref: ref) } func singleValueContainer() throws -> SingleValueDecodingContainer { self } func decoder(referencing node: JSValue, with key: CodingKey) -> _Decoder { _Decoder(referencing: node, userInfo: userInfo, codingPath: codingPath + [key]) } func superDecoder(referencing node: JSValue) -> _Decoder { _Decoder(referencing: node, userInfo: userInfo, codingPath: codingPath.dropLast()) } } private enum Object { static let ref = JSObject.global.Object.function! static func keys(_ object: JSObject) -> [String] { let keys = ref.keys!(object).array! return keys.map { $0.string! } } } private func _keyNotFound(at codingPath: [CodingKey], _ key: CodingKey) -> DecodingError { let description = "No value associated with key \(key) (\"\(key.stringValue)\")." let context = DecodingError.Context(codingPath: codingPath, debugDescription: description) return .keyNotFound(key, context) } private func _typeMismatch(at codingPath: [CodingKey], _ type: Any.Type, reality: Any) -> DecodingError { let description = "Expected to decode \(type) but found \(reality) instead." let context = DecodingError.Context(codingPath: codingPath, debugDescription: description) return .typeMismatch(type, context) } struct _JSCodingKey: CodingKey { var stringValue: String var intValue: Int? init?(stringValue: String) { self.stringValue = stringValue intValue = nil } init?(intValue: Int) { stringValue = "\(intValue)" self.intValue = intValue } init(index: Int) { stringValue = "Index \(index)" intValue = index } static let `super` = _JSCodingKey(stringValue: "super")! } private struct _KeyedDecodingContainer<Key: CodingKey>: KeyedDecodingContainerProtocol { private let decoder: _Decoder private let ref: JSObject var codingPath: [CodingKey] { return decoder.codingPath } var allKeys: [Key] { Object.keys(ref).compactMap(Key.init(stringValue:)) } init(decoder: _Decoder, ref: JSObject) { self.decoder = decoder self.ref = ref } func _decode(forKey key: CodingKey) throws -> JSValue { let result = ref[key.stringValue] guard !result.isUndefined else { throw _keyNotFound(at: codingPath, key) } return result } func _throwTypeMismatchIfNil<T>(forKey key: CodingKey, _ transform: (JSValue) -> T?) throws -> T { let jsValue = try _decode(forKey: key) guard let value = transform(jsValue) else { throw _typeMismatch(at: codingPath, T.self, reality: jsValue) } return value } func contains(_ key: Key) -> Bool { !ref[key.stringValue].isUndefined } func decodeNil(forKey key: Key) throws -> Bool { try _decode(forKey: key).isNull } func decode<T>(_: T.Type, forKey key: Key) throws -> T where T: ConstructibleFromJSValue & Decodable { return try _throwTypeMismatchIfNil(forKey: key) { T.construct(from: $0) } } func decode<T>(_: T.Type, forKey key: Key) throws -> T where T: Decodable { return try T(from: _decoder(forKey: key)) } func nestedContainer<NestedKey>(keyedBy _: NestedKey.Type, forKey key: Key) throws -> KeyedDecodingContainer<NestedKey> where NestedKey: CodingKey { try _decoder(forKey: key).container(keyedBy: NestedKey.self) } func nestedUnkeyedContainer(forKey key: Key) throws -> UnkeyedDecodingContainer { try _decoder(forKey: key).unkeyedContainer() } func superDecoder() throws -> Decoder { try _decoder(forKey: _JSCodingKey.super) } func superDecoder(forKey key: Key) throws -> Decoder { try _decoder(forKey: key) } func _decoder(forKey key: CodingKey) throws -> Decoder { let value = try _decode(forKey: key) return decoder.decoder(referencing: value, with: key) } } private struct _UnkeyedDecodingContainer: UnkeyedDecodingContainer { var codingPath: [CodingKey] { decoder.codingPath } let count: Int? var isAtEnd: Bool { currentIndex >= count ?? 0 } var currentIndex: Int = 0 private var currentKey: CodingKey { return _JSCodingKey(index: currentIndex) } let decoder: _Decoder let ref: JSObject init(decoder: _Decoder, ref: JSObject) { self.decoder = decoder count = ref.length.number.map(Int.init) self.ref = ref } mutating func _currentValue() -> JSValue { defer { currentIndex += 1 } return ref[currentIndex] } mutating func _throwTypeMismatchIfNil<T>(_ transform: (JSValue) -> T?) throws -> T { let value = _currentValue() guard let jsValue = transform(value) else { throw _typeMismatch(at: codingPath, T.self, reality: value) } return jsValue } mutating func decodeNil() throws -> Bool { return _currentValue().isNull } mutating func decode<T>(_: T.Type) throws -> T where T: ConstructibleFromJSValue & Decodable { try _throwTypeMismatchIfNil { T.construct(from: $0) } } mutating func decode<T>(_: T.Type) throws -> T where T: Decodable { return try T(from: _decoder()) } mutating func nestedContainer<NestedKey>(keyedBy _: NestedKey.Type) throws -> KeyedDecodingContainer<NestedKey> where NestedKey: CodingKey { return try _decoder().container(keyedBy: NestedKey.self) } mutating func nestedUnkeyedContainer() throws -> UnkeyedDecodingContainer { return try _decoder().unkeyedContainer() } mutating func superDecoder() throws -> Decoder { _decoder() } mutating func _decoder() -> Decoder { decoder.decoder(referencing: _currentValue(), with: currentKey) } } extension _Decoder: SingleValueDecodingContainer { func _throwTypeMismatchIfNil<T>(_ transform: (JSValue) -> T?) throws -> T { guard let jsValue = transform(node) else { throw _typeMismatch(at: codingPath, T.self, reality: node) } return jsValue } func decodeNil() -> Bool { node.isNull } func decode<T>(_: T.Type) throws -> T where T: ConstructibleFromJSValue & Decodable { try _throwTypeMismatchIfNil { T.construct(from: $0) } } func decode<T>(_ type: T.Type) throws -> T where T: Decodable { let primitive = { (node: JSValue) -> T? in guard let constructibleType = type as? ConstructibleFromJSValue.Type else { return nil } return constructibleType.construct(from: node) as? T } return try primitive(node) ?? type.init(from: self) } } /// `JSValueDecoder` facilitates the decoding of JavaScript value into semantic `Decodable` types. public class JSValueDecoder { /// Initializes a new `JSValueDecoder`. public init() {} /// Decodes a top-level value of the given type from the given JavaScript value representation. /// /// - Parameter T: The type of the value to decode. /// - Parameter value: The `JSValue` to decode from. public func decode<T>( _: T.Type = T.self, from value: JSValue, userInfo: [CodingUserInfoKey: Any] = [:] ) throws -> T where T: Decodable { let decoder = _Decoder(referencing: value, userInfo: userInfo) return try T(from: decoder) } } |
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