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SION handler in Swift. also handles / JSON / Property List / msgpack.org[SION,Swift]

Swift 4.2 MIT LiCENSE build status


SION handler in Swift.


import SION
var sion:SION = [
    "nil":      nil,
    "bool":     true,
    "int":      -42,
    "double":   42.195,
    "string":   "漢字、カタカナ、ひらがなの入ったstring😇",
    "array":    [nil, true, 1, 1.0, "one", [1], ["one":1.0]],
    "dictionary":   [
        "nil":nil, "bool":false, "int":0, "double":0.0, "string":"","array":[], "object":[:]
sion["date"] = .Date(0x0p+0)
sion["ext"]  = .Ext("1NTU") // 0xd4,0xd4,0xd4

This module is both an introduction and a reference implementation of SION, a data serialization formatlike JSON but more capable and expressive . As JSON is originated from a {ECMA,Java}Script literal, SION is originated from a Swift literal. So like JSON was named after JavaScript Object Notation, SION was named after Swift Interchangeable Object Notation. But as its name suggests, SION is language independent like JSON.

SION can serialize anything JSON can plus:

  • support Data
  • support Date
  • non-String keys in Dictionary
  • Int and Double distinctively, not Number. Therefore you can exchange 64-bit integers losslessly.
  • // comment support!
  • Roughly equvalent to MsgPack in terms of capability.
    • MsgPack is a binary serialization while SION is a text serialization.
Type SION MsgPack JSON Property List Comment
Nil ✔︎ ✔︎ ✔︎ plist: .binary only
Bool ✔︎ ✔︎ ✔︎ ✔︎
Int ✔︎ ✔︎ ✔︎ 64bit
Double ✔︎ ✔︎ ✔︎ ✔︎ JSON's Number
String ✔︎ ✔︎ ✔︎ ✔︎ utf-8 encoded
Data ✔︎ ✔︎ ✔︎ binary blob
Date ✔︎ ✔︎ ✔︎ .timeIntervalSince1970 in Double
[Self] ✔︎ ✔︎ ✔︎ ✔︎ aka Array
[String:Self] ✔︎ ✔︎ ✔︎ ✔︎ aka Object, Map…
[Self:Self] ✔︎ ✔︎ non-String keys
Ext ✔︎ ✔︎ msgpack extension
  • As you see SION is upper-compatible with JSON and Property List. As a matter of fact, SION can {,de}serialize JSON and Property List.

As for the format details, see the main page of SION.


Is now at DESCRIPTION.md.



$ git clone https://github.com/dankogai/swift-sion.git
$ cd swift-sion # the following assumes your $PWD is here
$ swift build



$ swift run --repl


$ scripts/run-repl.sh


$ swift build && swift -I.build/debug -L.build/debug -lSION

and in your repl,

  1> import SION
  2> let sion:SION = ["swift":["safe","fast","expressive"]]
sion: SION.SION = Object {
  Object = 1 key/value pair {
    [0] = {
      key = "swift"
      value = Array {
        Array = 3 values {
          [0] = String {
            String = "safe"
          [1] = String {
            String = "fast"
          [2] = String {
            String = "expressive"


Xcode project is deliberately excluded from the repository because it should be generated via swift package generate-xcodeproj . For convenience, you can

$ scripts/prep-xcode

And the Workspace opens up for you with Playground on top. The playground is written as a manual. To run, make sure to check Build Active Scheme in Playground Setting.

iOS and Swift Playground

Unfortunately Swift Package Manager does not support iOS. To make matters worse Swift Playgrounds does not support modules. But don't worry. This module is so compact all you need is copy SION.swift.

In case of Swift Playgrounds just copy it under Sources folder. If you are too lazy just run:

$ scripts/ios-prep.sh

and iOS/JSON.playground is all set. You do not have to import JSON therein.

The playgoround is fully compatible with iOS. Sync it via iCloud drive and enjoy!

From Your SwiftPM-Managed Projects

Add the following to the dependencies section:

  url: "https://github.com/dankogai/swift-sion.git", from: "0.0.0"

and the following to the .target argument:

  name: "YourSwiftyPackage",
  dependencies: ["SION"])

Now all you have to do is:

import SION

in your code. Enjoy!


Swift 5 or better, OS X or Linux to build.


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