1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72

//! # About
//!
//! rusymbols is a Rust crate for symbolic mathematics. It aims to become a full-featured computer
//! algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible
//! and easily extensible. rusymbols is written entirely in Rust.
//!
//! (maybe some engineers want to learn Rust :))
//!
//! The crate is designed to support the Rust language and add the ability to work with complex
//! formulas at the speed of Rust, possibly slower than programmed without a high level of
//! abstraction. Do not think about their solution, especially since there are formulas that change
//! depending on the circumstances.The goal of the project is at least to become similar to SymPy.
//!
//! # Key ideas:
//!     - Simple.
//!     - Fast (maybe not at maximum speed, but still fast)
//!     - Safe
//!     - Universal (compatibility with nalgebra and standard types (possibly) and other similar crates)
//!
//! # How to use
//!     Just use it! The main idea is simplicity. Enjoy!
//! ## Example
//! ```
//! use rusymbols::Expression;
//! use std::collections::HashMap;
//!
//! let x = Expression::new_var("x");
//! let two = Expression::new_val(2.0);
//! let polynomial = x.clone().pow(two.clone()) - x + two;
//!
//! let mut args: HashMap<&str, f64> = HashMap::new();
//! args.insert("x", 1.0);
//!
//! assert_eq!(polynomial.to_string(), "x**2 - x + 2");
//! assert_eq!(polynomial.eval_args(&args).unwrap(), 2.0);
//! ```

pub mod core;
pub use crate::core::Expression;

#[cfg(test)]
mod tests {
    use crate::core;

    #[test]
    fn expressions_priority_eq() {
        assert_eq!(core::Actions::Add, core::Actions::Add);
        assert_eq!(core::Actions::Mul, core::Actions::Mul);
        assert_eq!(core::Actions::Div, core::Actions::Div);
        assert_eq!(core::Actions::Pow, core::Actions::Pow);
        assert_eq!(core::Actions::Brackets(Box::from(core::Expression::default()),
                                           core::Brackets::Round),
                   core::Actions::Brackets(Box::from(core::Expression::default()),
                                           core::Brackets::Round));
        assert_eq!(core::Actions::Var(String::from("x")), core::Actions::Var(String::from("x")));
        assert_eq!(core::Actions::Val(0.0), core::Actions::Val(1.0));
        assert_eq!(core::Actions::Val(2.0), core::Actions::Var(String::from("x")));
        assert_eq!(core::Actions::Var(String::from("x")), core::Actions::Val(3.0));
        assert_ne!(core::Actions::Mul, core::Actions::Add);
        assert_ne!(core::Actions::Add, core::Actions::Mul);
        assert_ne!(core::Actions::Add, core::Actions::Pow);
        assert_ne!(core::Actions::Mul, core::Actions::Pow);
    }

    #[test]
    fn expressions_priority_ord() {
        assert!(core::Actions::Add < core::Actions::Mul);
        assert!(core::Actions::Mul < core::Actions::Pow);
        assert!(core::Actions::Pow < core::Actions::Brackets(
            Box::new(core::Expression::default()), core::Brackets::Round))
    }
}