#[derive(Copy, Clone)]
#[repr(u8)]
enum StyledComponentsHelper {
    CreateGlobalStyle = 0,
    Css = 1,
    UseTheme = 2,
    WithTheme = 3,
    InjectGlobal = 4,
    Keyframes = 5,
}

const STRS: &[&str] = &[
    "createGlobalStyle", "css", "useTheme", "withTheme", "injectGlobal", "keyframes"
];

impl StyledComponentsHelper {
    fn from_str(name: &str) -> Option<Self> {
        if name.len() < 3 {
            return None;
        }
        // 3rd and 4th bits of 1st byte and 5th bit of 3rd byte make a number
        // between 0..=5 which is different for each string
        let bytes = name.as_bytes();
        let index = ((bytes[0] >> 1) & 6) | ((bytes[2] >> 4) & 1);
        if index >= 6 {
            return None;
        }
        if name != STRS[index as usize] {
            return None;
        }
        // This compiles down to a no-op
        Some(match index {
            0 => StyledComponentsHelper::CreateGlobalStyle,
            1 => StyledComponentsHelper::Css,
            2 => StyledComponentsHelper::UseTheme,
            3 => StyledComponentsHelper::WithTheme,
            4 => StyledComponentsHelper::InjectGlobal,
            5 => StyledComponentsHelper::Keyframes,
            _ => unreachable!(),
        })
    }
}