The macOS app by Swift language

2019/5/12.  The macOS appHow to make it by Swift language

The macOS app written by Swift language will increase in near future.

So I want to introduce my experience about “Swift2Kotlin” what I made in the past.

1. Github URL

https://github.com/Kouhei-Takagi/Swift2Kotlin

2.App view

3.Source code(View controller.swift)

//

//  ViewController.swift

//  Swift2Kotlin

//

//  Created by 高木耕平 on 2019/01/24.

//  Copyright © 2019 高木耕平. All rights reserved.

//

import Cocoa

import Foundation

class ViewController: NSViewController {

    

    @IBOutlet weak var swiftCode: NSScrollView!

    @IBOutlet weak var kotlinCode: NSScrollView!

    

    var kotlinCodeString: String!

    

    @IBOutlet var swiftCode1: NSTextView!

    @IBOutlet var kotlinCode1: NSTextView!

    

    override func viewDidLoad() {

        super.viewDidLoad()

      

    }

    override var representedObject: Any? {

        didSet {

      

        }

    }

    //Copyied from SwiftKotlin. From here...

    

    @IBAction func openSwiftFile(_ sender: AnyObject) {

        let oPanel: NSOpenPanel = NSOpenPanel()

        oPanel.canChooseDirectories = false

        oPanel.canChooseFiles = true

        oPanel.allowsMultipleSelection = false

        oPanel.allowedFileTypes = ["swift"]

        oPanel.prompt = "Open"

        

        oPanel.beginSheetModal(for: self.view.window!, completionHandler: { (button: NSApplication.ModalResponse) -> Void in

            if button == NSApplication.ModalResponse.OK {

                let filePath = oPanel.urls.first!.path

                let fileHandle = FileHandle(forReadingAtPath: filePath)

                if let data = fileHandle?.readDataToEndOfFile() {

                    self.swiftCode1.textStorage?.beginEditing()

                    self.swiftCode1.textColor = NSColor.black

                    self.swiftCode1.string = String(data: data, encoding: .utf8) ?? ""

                    self.swiftCode1.textStorage?.endEditing()

                    

                    

                }

            }

        })

    }

    

    //To here...  Thanks for Giants.

    

    @IBAction func format(_ sender: NSButton) {

        let swiftCodeString:String = swiftCode1.string

        //Simple line replacements are here.

        kotlinCodeString = swiftCodeString.replacingOccurrences(of: "let ", with: "val ")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "print", with: "println")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "func ", with: "fun ")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "->", with: ":")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "\\(", with: "${")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "for i in 0..<count", with: "for (i in 0..count - 1)")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "[String]()", with: "arrayOf<String>()")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "[String: Float]()", with: "mapOf<String, Float>()")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "...", with: "..")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "..<", with: "until")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "switch ", with: "when ")

        kotlinCodeString = kotlinCodeString.replacingOccurrences(of: "[", with: "arrayOf( ")

        

        //Multiple lines replacements are here.

        var sentenceFun = kotlinCodeString!

        var arr:[String] = sentenceFun.components(separatedBy: "for")

        var arr2:[String]

        var token : String

        var token2 : String

        var numberFor : Int = arr.count - 1

        

        //"for" replacement for aaa {} -> for (aaa) {}

        while numberFor > 0 {

            arr2 = arr[(numberFor)].components(separatedBy: "{")

            token = String(arr[(numberFor)][(arr[(numberFor)].index(of: " ") ?? arr[(numberFor)].startIndex)..<(arr[(numberFor)].index(of: "{") ?? arr[(numberFor)].index(before: arr[(numberFor)].endIndex))]);

            token.removeFirst(1)

            token.removeLast(1)

            token = "for " + "(" + token + ") "

            arr2.remove(at: 0)

            token = token + "{" + arr2.joined(separator: "{")

            arr[(numberFor)] = token

            sentenceFun = arr.joined()

            numberFor = numberFor - 1

        }

        

        //"if" replacement if aaa {} -> if (aaa) {}

        arr = sentenceFun.components(separatedBy: "if")

        numberFor = arr.count - 1

        while numberFor > 0 {

            arr2 = arr[(numberFor)].components(separatedBy: "{")

            token = String(arr[(numberFor)][(arr[(numberFor)].index(of: " ") ?? arr[(numberFor)].startIndex)..<(arr[(numberFor)].index(of: "{") ?? arr[(numberFor)].index(before: arr[(numberFor)].endIndex))]);

            token.removeFirst(1)

            token.removeLast(1)

            token = "if " + "(" + token + ") "

            arr2.remove(at: 0)

            token = token + "{" + arr2.joined(separator: "{")

            arr[(numberFor)] = token

            sentenceFun = arr.joined()

            numberFor = numberFor - 1

        }

        /*

        //"array" replacement [,] -> arrayOf(,)

        arr = sentenceFun.components(separatedBy: "arrayOf")

        numberFor = arr.count - 1

        while numberFor > 0 {

            token = String(arr[(numberFor)][(arr[(numberFor)].index(of: " ") ?? arr[(numberFor)].startIndex)..<(arr[(numberFor)].index(of: "]") ?? arr[(numberFor)].index(before: arr[(numberFor)].endIndex))]);

            token.removeFirst(1)

            token = "arrayOf" + "(" + token + ")" + "\r"

            arr[(numberFor)] = token

            sentenceFun = arr.joined()

            numberFor = numberFor - 1

        }

        */

        //"switch" replacement switch aaa {} -> when (aaa) {}

        arr = sentenceFun.components(separatedBy: "when")

        numberFor = arr.count - 1

        

        while numberFor > 0 {

            token = String(arr[(numberFor)][(arr[(numberFor)].index(of: " ") ?? arr[(numberFor)].startIndex)..<(arr[(numberFor)].index(of: "{") ?? arr[(numberFor)].index(before: arr[(numberFor)].endIndex))]);

            token.removeFirst(1)

            token.removeLast(1)

            token = "when " + "(" + token + ") "

            arr2 = arr[(numberFor)].components(separatedBy: "}")

            token2 = String(arr2[0][(arr2[0].index(of: "{") ?? arr2[0].startIndex)...(arr2[0].index(of: "}") ?? arr2[0].index(before: arr2[0].endIndex))]);

            token2 = token2.replacingOccurrences(of: "case", with: "in")

            token2 = token2.replacingOccurrences(of: "default", with: "else")

            arr2.remove(at: 0)

            arr[(numberFor)] = token + token2 + "}" + arr2.joined(separator: "}")

            sentenceFun = arr.joined()

            numberFor = numberFor - 1

        }

        

        kotlinCodeString = sentenceFun

        kotlinCode1.string = kotlinCodeString

    }

    

    @IBAction func saveTxtFile(_ sender: Any) {

        //Copied from http://www.royalcrab.net/wpx/?p=6171

        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory,.userDomainMask, true)[0] as String

        let fileObject = kotlinCode1.string

        

        let formatter = DateFormatter()

        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

        let date = formatter.string(from: Date())

        let fileName = "\(date)Kotlin"

        let filePath = documentsPath + "/" + fileName

        

        do {

            try fileObject.write(toFile: filePath, atomically: true,

                                 encoding: String.Encoding.utf8)

            

            let alert = NSAlert()

            alert.messageText = filePath

            alert.runModal()

            

        } catch {

            let alert = NSAlert()

            alert.messageText = "Error"

            alert.runModal()

        }

        

    }

    

}

4.Problems

(1)There is only a few blog or source for macOS app by Swift language, so it is difficult to make it.

(2)Try is more than think. So I tried.

(3)I forgot how to make “Swift2Kotlin”. I am not good at remembering…