Pastebin: ごまかすJSON

Format

C

Post date

2019-10-29 18:17

Publication Period

Unlimited

 import Foundation
 
 
 struct A: Decodable {
     let hoge: String
     private let shadowIsUse: IsUse
     
     var isUse: Bool { shadowIsUse.val }
     
     enum CodingKeys: String, CodingKey {
         case hoge
         case shadowIsUse = "isUse"
     }
     
     private struct IsUse: Decodable {
         let val: Bool
         
         init(from decoder: Decoder) throws {
             val = try Result<Bool, Error> {
                     try decoder.singleValueContainer().decode(Bool.self)
                 }
                 .flatMapError { _ in
                     Result { try decoder.singleValueContainer().decode(Int.self) != 0 }
             }
             .get()
         }
     }
 }
 
 let j1 = """
 {
     "isUse": false,
     "hoge": "hoge"
 }
 """
 
 let j2 = """
 {
     "isUse": 1,
     "hoge": "hoge"
 }
 """
 
 let decoder = JSONDecoder()
 print(try! decoder.decode(A.self, from: j1.data(using: .utf8)!))
 print(try! decoder.decode(A.self, from: j2.data(using: .utf8)!))