combine enum's the RawValue type define and it's protocol as the one

[ZhipingYang]

public protocol PrettyRawRepresentable: RawRepresentable where RawValue == String {
    var prettyRawValue: RawValue { get }
}
public extension PrettyRawRepresentable {
    var prettyRawValue: String {
        let paths = String(reflecting: self).split(separator: ".").dropFirst()
        if String(paths.last ?? "") != rawValue {
            return rawValue
        }
        return paths.joined(separator: "_")
    }
}

As we already defined PrettyRawRepresentable's RawValue == String,
but enum cannot write as blow, why?

enum Home: PrettyRawRepresentable {    
    case setting
} 
let str = Home.seeting.prettyRawValue // Home_setting

current

enum Home: String, PrettyRawRepresentable {
    case setting
}

let str = Home.seeting.prettyRawValue // Home_setting

wants

enum Home: XXX {
    case setting
}
let str = Home.seeting.prettyRawValue // Home_setting

• XXX can be a protocol or a struct, but should better as a subprotocol of RawRepresentable
• XXX method already be achieved (no more code as the blow)

see more: AccessibilityIdentifier

[ZhipingYang]

older test case

 struct AccessibilityID {
    enum Home: String { 
        case setting = "HomeSetting" 
    }
    enum Welcome: String, PrettyRawRepresentable { 
        case setting1
        case setting2 = "WelcomeSetting"
    }
 }
 let h_path = AccessibilityID.Home.setting.rawValue  // "HomeSetting"
 let w_path1 = AccessibilityID.Welcome.setting1.rawValue  // "setting1"
 let w_path1 = AccessibilityID.Welcome.setting1.prettyRawValue  // "AccessibilityID_Welcome_setting1" 
 let w_path1 = AccessibilityID.Welcome.setting2.prettyRawValue  // "WelcomeSetting"

new test case

 struct AccessibilityID {
    enum Home: String { 
        case setting = "HomeSetting" 
    }
    enum Welcome: XXX { 
        case setting1
        case setting2 = "WelcomeSetting"
    }
 }
 let path1 = AccessibilityID.Home.setting.rawValue  // "HomeSetting"
 let path2 = AccessibilityID.Welcome.setting1.rawValue  // "AccessibilityID_Welcome_setting1"
 let path3 = AccessibilityID.Welcome.setting2.rawValue  // "WelcomeSetting"