Crate sari

Simple arithmetic expression evaluator.

Usage

To evaluate an expression, use the sari::eval function:

use sari::Error;

let result = sari::eval("(1 + 2) * 3");
assert_eq!(result, Ok(9));

let result = sari::eval("(1 + 2");
assert_eq!(result, Err(Error::new("expected `)`")));

let result = sari::eval("1 / 0");
assert_eq!(result, Err(Error::new("division by zero")));

Expressions

The expressions consist of integers combined using +, -, *, and / binary operators (with the usual precedence and associativity) and grouped using parentheses. These elements can be separated by whitespace.

The expressions use wrapping 32-bit signed arithmetic. Division by zero is an error.

Structs

Error

Error returned when expression evaluation fails.

Functions

eval

Evaluates an expression and returns the result.