UnicodeExplorer.swift

//
//  ContentView.swift
//  UnicodeExplorer
//
//  Created by David Albert on 5/1/24.
//

import SwiftUI

struct ContentView: View {
    @State var text: String = ""

    var body: some View {
        VStack {
            Form {
                TextField("Text", text: $text)
                LabeledContent("Code points") {
                    VStack(alignment: .leading, spacing: 5) {
                        ForEach(Array(text.unicodeScalars.enumerated()), id: \.0) { (i, s) in
                            if let name = s.properties.name {
                                return Text("\(i). \(String(format: "U+%04X", s.value)) \(name)")
                            } else {
                                return Text("\(i). <?>")
                            }

                        }
                    }
                }
            }
            Spacer()
        }
        .padding()
        .onChange(of: text) {
            let regex = /\\u{([0-9a-fA-F]+)}/

            if !text.contains(regex) {
                return
            }

            let newText = text.replacing(regex) { match in
                let codePoint = Int(match.output.1, radix: 16)!
                if let scalar = Unicode.Scalar(codePoint) {
                    return String(scalar)
                }
                return String(match.output.0)
            }

            text = newText
        }
    }
}

#Preview {
    ContentView()
}