// Can use   - border-bottom :  "purple,3"
// Can use   - border-bottom :  "#444, 3"
// etc

conf.interpreter.map(UILabel.self, forAttributeKey: "border-bottom", withType:Borderized.self) {
            let key = $0.key.appending("C-")

            let layer = $0.component.layer.sublayers?.lazy.filter { $0.name == key }.first ?? CALayer()

            layer.frame = $0.component.frame
            layer.name = key
            layer.frame.size.height = CGFloat($0.value.width)
            layer.backgroundColor = $0.value.color.cgColor
            layer.frame = layer.frame.offsetBy(dx: 0, dy: $0.component.intrinsicContentSize.height)
            $0.component.layer.addSublayer(layer)
            $0.component.layer.masksToBounds = false
        }


        conf.lexer.type.tokenize(from: String.self, to: Borderized.self) {
            let list = $0.inputValue.components(separatedBy: ",").flatMap {$0.trimmingCharacters(in: .whitespacesAndNewlines) }
            guard let color = list.first, let width = list.last else { return nil }

            let c:UIColor? = conf.lexer.type.scan(withValue: color)
            let w:Double? = conf.lexer.type.scan(withValue: width)
            return Borderized(color: c, width: w)

        }



struct Borderized {
    let color: UIColor
    let width: Double
    init?(color:UIColor?, width:Double?) {
        guard let c = color, let w = width else { return nil }
        self.color = c
        self.width = w
    }
}

extension Borderized : InterpreterValue { }