mirror of
https://github.com/fluencelabs/lalrpop
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37 lines
779 B
Rust
37 lines
779 B
Rust
use std::fmt::{Debug, Formatter, Error};
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pub enum Expr {
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Number(i32),
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Op(Box<Expr>, Opcode, Box<Expr>),
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}
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#[derive(Copy, Clone)]
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pub enum Opcode {
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Mul,
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Div,
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Add,
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Sub,
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}
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impl Debug for Expr {
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fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error> {
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use self::Expr::*;
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match *self {
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Number(n) => write!(fmt, "{:?}", n),
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Op(ref l, op, ref r) => write!(fmt, "({:?} {:?} {:?})", l, op, r),
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}
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}
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}
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impl Debug for Opcode {
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fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error> {
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use self::Opcode::*;
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match *self {
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Mul => write!(fmt, "*"),
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Div => write!(fmt, "/"),
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Add => write!(fmt, "+"),
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Sub => write!(fmt, "-"),
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}
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}
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}
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