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::solve::solve;
use crate::symbolic::solve::solve_linear_system;
use crate::symbolic::solve::solve_system;

/// Solves an equation for a given variable.
/// Takes JSON strings representing `Expr` (equation) and `String` (variable).
/// Returns a JSON string representing the `Expr` of the solution.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_solve(
    expr_json: *const c_char,
    var_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

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

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

/// Solves a system of equations for given variables.
/// Takes JSON strings representing `Vec<Expr>` (equations) and `Vec<String>` (variables).
/// Returns a JSON string representing the `Expr` of the solution.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_solve_system(
    equations_json: *const c_char,
    vars_json: *const c_char,
) -> *mut c_char {
    let equations: Option<Vec<Expr>> = from_json_string(equations_json);

    let vars: Option<Vec<String>> = from_json_string(vars_json);

    match (equations, vars) {
        | (Some(eqs), Some(vs)) => {
            let vars_str: Vec<&str> = vs.iter().map(std::string::String::as_str).collect();

            match solve_system(&eqs, &vars_str) {
                | Some(result) => to_json_string(&result),
                | None => std::ptr::null_mut(),
            }
        },
        | _ => std::ptr::null_mut(),
    }
}

/// Solves a linear system of equations.
/// Takes JSON strings representing `Expr` (system) and `Vec<String>` (variables).
/// Returns a JSON string representing the `Expr` of the solution.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_solve_linear_system(
    system_json: *const c_char,
    vars_json: *const c_char,
) -> *mut c_char {
    let system: Option<Expr> = from_json_string(system_json);

    let vars: Option<Vec<String>> = from_json_string(vars_json);

    match (system, vars) {
        | (Some(sys), Some(vs)) => {
            match solve_linear_system(&sys, &vs) {
                | Ok(result) => to_json_string(&result),
                | Err(_) => std::ptr::null_mut(),
            }
        },
        | _ => std::ptr::null_mut(),
    }
}