5 releases
0.1.4 | Dec 5, 2023 |
---|---|
0.1.3 | Nov 24, 2023 |
0.1.2 | Nov 22, 2023 |
0.1.1 | Nov 21, 2023 |
0.1.0 | Nov 21, 2023 |
#724 in Math
29 downloads per month
61KB
1K
SLoC
m_calc
!!! this crate is under development and future updates will include breaking changes !!!
m_calc
is a Rust crate for calculating mathematical expressions in strings.
For instance, a string like "2*3^(4-2)+14%3"
should be calculated to 20
It also supports mathematical functions like: \sqrt(3.14159)
is approximately 0
And variables: "a=10;5+a"
-> 15
Usage
Add to cargo project
cargo add m_calc
Parse a string into a vector of tokens, and calculate the vector of tokens.
use m_calc::{tokenize, calculate};
use std::collections::HashMap;
let tokens = tokenize("2*3^(4-2)+14%3").unwrap();
let mut context = HashMap::new(); // The `context` is where variable assignments are stored
let res = calculate(&tokens, &mut context).unwrap();
println!("{}", res.display()); // `display` is a method of `Token`s that displays it as a simple expression (like `10`, or `a`)
assert_eq!("20", res.display());
Dependencies
~2.9–4MB
~70K SLoC