Rust instructions for ROSE-8

rose8.rs

// Thanks to Jordan Rose: https://twitter.com/UINT_MIN/status/1215832790958100480

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Op1 {
    Zero,
    Lsl1,
    Lsr1,
    Asr1,
    Incr,
    Decr,
    Comp,
    Negt,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum OpR {
    Add,
    Sub,
    And,
    Ior,
    Xor,
    Lsl,
    Lsr,
    Asr,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Data {
    D1,
    D2,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Special {
    Data(Data),
    Code,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct Reg(U3);
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct U3(u8);
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct AddImm(i8);

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum AluI {
    And(u8),
    Ior(u8),
    Xor(u8),
    Add(AddImm),
    Rol(U3),
    Lsl(U3),
    Lsr(U3),
    Asr(U3),
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Inst {
    Trap,
    JAbs,
    CAbs,
    JOff,
    COff,
    Swap(Reg),
    GetR(Reg),
    SetR(Reg),
    Get(Special),
    Set(Special),
    Alu1(Op1),
    IsLt(Reg),
    AluR(OpR, Reg),
    LdD(Data, Reg),
    StD(Data, Reg),
    AluI(AluI),
    BEzI(i8),
    JOfI(i8),
    COfI(i8),
}

impl Reg {
    pub fn new(x: u8) -> Option<Reg> {
        U3::new(x).map(Reg)
    }
}

impl U3 {
    pub fn new(x: u8) -> Option<U3> {
        match x {
            0..=7 => Some(U3(x)),
            _ => None,
        }
    }
}

impl AddImm {
    pub fn new(x: i8) -> Option<AddImm> {
        match x {
            -64..=127 => Some(AddImm(x)),
            _ => None,
        }
    }
}