use core::ops::Range;

pub(crate) trait OffsetSize {
    fn offset(self) -> u8;
    fn size(self) -> u8;
}

impl OffsetSize for u8 {
    fn offset(self) -> u8 {
        self
    }

    fn size(self) -> u8 {
        1
    }
}

impl OffsetSize for Range<u8> {
    fn offset(self) -> u8 {
        self.start
    }

    fn size(self) -> u8 {
        self.end - self.start
    }
}

pub(crate) trait U16Ext {
    fn from_parts(low: u8, high: u8) -> Self;

    fn low(self) -> u8;

    fn high(self) -> u8;
}

impl U16Ext for u16 {
    fn from_parts(low: u8, high: u8) -> u16 {
        ((high as u16) << 8) + low as u16
    }

    fn low(self) -> u8 {
        (self & 0xff) as u8
    }

    fn high(self) -> u8 {
        (self >> 8) as u8
    }
}

#[derive(Clone, Copy)]
pub struct Mask;

#[derive(Clone, Copy)]
pub struct R;

#[derive(Clone, Copy)]
pub struct W;