init?()

in Cyborg/XMLSchema.swift [96:134]

• 34 lines of code
• 9 McCabe index (conditional complexity)

    init?(_ string: XMLString) {
        if string.count == 0 {
            return nil
        } else if string[safeIndex: 0] == .questionMark {
            if string.count > 1 {
                self = .theme(name: String(copying: string[1..<string.count]))
            } else {
                return nil
            }
        } else if string[safeIndex: 0] == .at {
            if string.count > 1 {
                self = .resource(named: String(copying: string[1..<string.count]))
            } else {
                return nil
            }
        } else {
            let hasAlpha = (string.count == 9)
            // munge the string into a form that Init.init(_:, radix:) can understand
            var withoutLeadingHashTag = String(withoutCopying: string)
            _ = withoutLeadingHashTag.remove(at: withoutLeadingHashTag.startIndex)
            if withoutLeadingHashTag.count == 3 {
                // convert from shorthand hexadecimal form, which doesn't work with the init
                withoutLeadingHashTag.append(withoutLeadingHashTag)
            }
            if let value = Int64(withoutLeadingHashTag, radix: 16) {
                func component(_ mask: Int64, _ shift: Int64) -> CGFloat {
                    return CGFloat((value & mask) >> shift) / 255
                }
                let alpha = hasAlpha ? component(0xFF000000, 24) : 1.0
                let color = UIColor(red: component(0xFF0000, 16),
                                    green: component(0xFF00, 8),
                                    blue: component(0xFF, 0),
                                    alpha: alpha)
                self = .hex(value: color)
            } else {
                return nil
            }
        }
    }