ihateintegrals 0.1.2

A computer algebra library for solving integrals.
Documentation 
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use std::rc::Rc;

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

use super::DerivationRule;

/**
* 1^x is 1
*/
pub struct OneToAnything {}

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

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

        if i.value() != 1 {
            return vec![];
        }

        vec![(
            Integer::of(1),
            Argument::new(
                String::from("One to anything is one"),
                vec![input],
                self.name(),
            ),
        )]
    }
    fn name(&self) -> String {
        String::from("OneToAnyPower")
    }
}