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use std::str::FromStr;
use std::fmt;
#[derive(PartialEq, Debug, Clone, Copy)]
pub enum Op {
Add,
Sub,
Mul,
Div,
Modulo,
Equals,
Greater,
GrEqTo,
Less,
LsEqTo,
}
impl fmt::Display for Op {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Op::Add => write!(f, "+"),
Op::Sub => write!(f, "-"),
Op::Mul => write!(f, "*"),
Op::Div => write!(f, "/"),
Op::Modulo => write!(f, "%"),
Op::Equals => write!(f, "="),
Op::Greater => write!(f, ">"),
Op::GrEqTo => write!(f, ">="),
Op::Less => write!(f, "<"),
Op::LsEqTo => write!(f, "<="),
}
}
}
impl FromStr for Op {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"+" => Ok(Op::Add),
"-" => Ok(Op::Sub),
"*" => Ok(Op::Mul),
"/" => Ok(Op::Div),
"%" => Ok(Op::Modulo),
"=" => Ok(Op::Equals),
">" => Ok(Op::Greater),
">=" => Ok(Op::GrEqTo),
"<" => Ok(Op::Less),
"<=" => Ok(Op::LsEqTo),
x => Err(format!("{} is not an operator", x))
}
}
}
pub type FloatType = f64;
#[derive(PartialEq, Debug, Clone)]
pub enum Number {
Int(isize),
Float(FloatType)
}
#[derive(PartialEq, Debug, Clone)]
pub enum Type {
Bool(bool),
Number(Number),
Str(String),
Symbol(String),
Operator(Op),
}
impl fmt::Display for Type {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Type::Bool(b) => write!(f, "{}", b),
Type::Number(Number::Int(n)) => write!(f, "{}", n),
Type::Number(Number::Float(n)) => write!(f, "{}", n),
Type::Str(s) => write!(f, "{}", s),
Type::Symbol(s) => write!(f, "{}", s),
Type::Operator(op) => write!(f, "{}", op)
}
}
}
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