[PLAYGROUND] Associated Enum RawValues

playground_associated_enum_rawvalues.swift

import Foundation

enum Parameter {
    enum Module {
        case partner(PartnerValues)
        
        enum Keys: String {
            case partner
        }
        
        enum PartnerValues: String {
            case facebook
        }
    }
}

extension Parameter.Module: RawRepresentable {
    typealias RawValue = String
    
    var rawValue: RawValue {
        switch self {
        case .partner(let value):
            return "\(Keys.partner.rawValue)=\(value.rawValue)"
        }
    }
    
    init?(rawValue: RawValue) {
        var val: Parameter.Module?
        let parameter = rawValue.components(separatedBy: "=")
    
        if let key = Keys(rawValue: parameter.first ?? "") {
            switch key {
            case .partner:
                if let value = PartnerValues(rawValue: parameter.last ?? "") {
                    val = .partner(value)
                }
            }
        }
        
        guard let value = val else { return nil }
        self = value
    }
}

Parameter.Module.partner(.facebook).rawValue
let p = Parameter.Module.init(rawValue: "partner=facebook")!
switch p {
case .partner(.facebook):
    print("FACEBOOK YO!")
}