ihateintegrals 0.1.2

A computer algebra library for solving integrals.
Documentation 
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

use std::rc::Rc;

use crate::{
    argument::Argument,
    expressions::{Expression, Integer},
};

use super::DerivationRule;

pub struct EvaluateExponents {}

impl DerivationRule for EvaluateExponents {
    fn apply(&self, input: Expression) -> Vec<(Expression, Rc<Argument>)> {
        let exponent = match input {
            Expression::Exponent(ref e) => e,
            _ => return vec![],
        };

        let Expression::Integer(ref base) = exponent.base() else {
            return vec![];
        };

        let Expression::Integer(ref power) = exponent.power() else {
            return vec![];
        };

        vec![(
            Integer::of(base.value().pow(power.value())),
            Argument::new(String::from("Evaluate exponents"), vec![input], self.name()),
        )]
    }

    fn name(&self) -> String {
        String::from("EvaluateExponents")
    }
}

#[cfg(test)]
mod tests {
    use crate::{convenience_expressions::i, expressions::Exponent};

    use super::*;

    #[test]
    fn test_1() {
        let rule = EvaluateExponents {};

        let start = Exponent::of(i(7), i(8));
        let result = rule.apply(start).first().unwrap().0.clone();

        assert_eq!(result, i(5764801));
    }
}