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use std::{
fmt::*,
ops::{Add, Div, Mul, Sub},
};
#[derive(Debug, Copy, Clone)]
pub enum LispNumber {
Integer(i64),
Float(f64),
}
impl Add for LispNumber {
type Output = Self;
fn add(self, rhs: Self) -> Self::Output {
use LispNumber::*;
match (self, rhs) {
(Integer(a), Integer(b)) => Integer(a + b),
(Float(a), Integer(b)) => Float(a + b as f64),
(Integer(a), Float(b)) => Float(a as f64 + b),
(Float(a), Float(b)) => Float(a + b),
}
}
}
impl Sub for LispNumber {
type Output = Self;
fn sub(self, rhs: Self) -> Self::Output {
use LispNumber::*;
match (self, rhs) {
(Integer(a), Integer(b)) => Integer(a - b),
(Float(a), Integer(b)) => Float(a - b as f64),
(Integer(a), Float(b)) => Float(a as f64 - b),
(Float(a), Float(b)) => Float(a - b),
}
}
}
impl Mul for LispNumber {
type Output = Self;
fn mul(self, rhs: Self) -> Self::Output {
use LispNumber::*;
match (self, rhs) {
(Integer(a), Integer(b)) => Integer(a * b),
(Float(a), Integer(b)) => Float(a * b as f64),
(Integer(a), Float(b)) => Float(a as f64 * b),
(Float(a), Float(b)) => Float(a * b),
}
}
}
impl PartialEq for LispNumber {
fn eq(&self, other: &Self) -> bool {
use LispNumber::*;
match (self, other) {
(Integer(a), Integer(b)) => *a == *b,
(Float(a), Integer(b)) => *a == *b as f64,
(Integer(a), Float(b)) => *a as f64 == *b,
(Float(a), Float(b)) => *a == *b,
}
}
}
impl Display for LispNumber {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
match self {
LispNumber::Integer(v) => write!(f, "{}", v),
LispNumber::Float(v) => write!(f, "{}", v),
}
}
}
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