A generic operator-precedence parser for Rust. You plug your own handler function, token struct, and operator enum, and this crate provides the algorithm.
Simple example is available in int_math.rs
sh
cargo run --example int_math
```rust
fn handler(lhs: f64, op: Op, rhs: f64, _ctx: &()) -> Result let climber = Climber::new(
vec![
Rule::new(Op::Add, Assoc::Left) | Rule::new(Op::Sub, Assoc::Right),
Rule::new(Op::Mul, Assoc::Left) | Rule::new(Op::Div, Assoc::Right),
Rule::new(Op::Exp, Assoc::Right)
],
handler
); // 2 + 2 * 3
// 2 + 6
// 8
let expression = Expression::new(
2.0f64,
vec![
(Op::Add, 2.0f64),
(Op::Mul, 3.0f64)
]
); assert_eq!(climber.process(&expression, &()).unwrap(), 8.0f64);
``` This crate is heavily based on the Pest parser's PrecClimber, but is a more generic implementation for non-Pest use.