rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
Documentation 
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use std::ffi::c_char;

use crate::ffi_apis::common::from_json_string;
use crate::ffi_apis::common::to_json_string;
use crate::symbolic::core::Expr;
use crate::symbolic::integration::integrate_rational_function_expr;
use crate::symbolic::integration::risch_norman_integrate;

/// Integrates an expression using the Risch-Norman algorithm (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_risch_norman_integrate(
    expr_json: *const c_char,
    x_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let x: Option<String> = from_json_string(x_json);

    match (expr, x) {
        | (Some(e), Some(var)) => {
            let result = risch_norman_integrate(&e, &var);

            to_json_string(&result)
        },
        | _ => std::ptr::null_mut(),
    }
}

/// Integrates a rational function (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_integrate_rational_function(
    expr_json: *const c_char,
    x_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let x: Option<String> = from_json_string(x_json);

    match (expr, x) {
        | (Some(e), Some(var)) => {
            match integrate_rational_function_expr(&e, &var) {
                | Ok(result) => to_json_string(&result),
                | Err(_) => std::ptr::null_mut(),
            }
        },
        | _ => std::ptr::null_mut(),
    }
}