CodableTS.swift

//
//  main.swift
//  CodableTS
//
//  Created by KatagiriSo on 2017/12/21.
//  Copyright © 2017年 katagiri. All rights reserved.
//

import Foundation

//print("Hello, World!")

let rawJson = """
{
    "hello": "world",
    "key": null,
    "int": 12345,
    "hogetype" : "box",
    "double": 9876.543,
    "url": "http://timers-inc.com/",
    "nested" : {
        "hoge" : "hoge!",
        "hogehoge" : "hoge2!"
    },
    "arrayNest" : [
    {
        "hoge" : "nestarrayhoge1",
        "hogehoge" : "1x"
    },
    {
        "hoge" : "nestarrayhoge2",
        "hogehoge" : "2x"
    }
    ]
}
"""

extension CustomStringConvertible where Self : Encodable {
    func desc() -> String {
        let encoder = JSONEncoder()
        encoder.outputFormatting = .prettyPrinted
        let data_ = try? encoder.encode(self)
        guard let data = data_ else {
            return ""
        }
        guard let str = String(data: data, encoding: .utf8) else {
            return ""
        }
        return str
    }
}

struct NewJson: Codable, CustomStringConvertible {
    
    let hello: String
    let key: String?
    let int: Int
    let double: Double
    let url: URL
    let op : Int = 0 // default
    
    let nested:Nested
    let arrayNest:[Nested]?
    
    let hogetype:HogeType
    
    enum HogeType : String, Codable {
        case box = "box"
        case line = "line"
    }
    
    class Nested : Codable, CustomStringConvertible {
        let hoge:String?
        let fuga:String?
        let poi:Int = 5 // JSONと無関係
        
        var description: String {
            get {
                return desc()
            }
        }
        
        enum CodingKeys: String, CodingKey {
            case hoge
            case fuga = "hogehoge"
        }
        
    }
    
    var description: String {
        get {
            return desc()
        }
    }
}

guard let data = rawJson.data(using: .utf8) else {
    print("data is nil")
    fatalError()
}

let decoder = JSONDecoder()
do {
    let newJson:NewJson = try decoder.decode(NewJson.self, from: data)
    print("newjson \(newJson)")
} catch let e {
    print("json decode error \(e)")
}