rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
Documentation 
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//! JSON-based FFI API for electromagnetism functions.

use std::os::raw::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::electromagnetism;
use crate::symbolic::vector::Vector;

/// Calculates Lorentz force using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_lorentz_force(
    charge_json: *const c_char,
    e_field_json: *const c_char,
    velocity_json: *const c_char,
    b_field_json: *const c_char,
) -> *mut c_char {
    let charge: Option<Expr> = from_json_string(charge_json);

    let e_field: Option<Vector> = from_json_string(e_field_json);

    let velocity: Option<Vector> = from_json_string(velocity_json);

    let b_field: Option<Vector> = from_json_string(b_field_json);

    match (charge, e_field, velocity, b_field) {
        | (Some(q), Some(e), Some(v), Some(b)) => {
            to_json_string(&electromagnetism::lorentz_force(&q, &e, &v, &b))
        },
        | _ => std::ptr::null_mut(),
    }
}

/// Calculates energy density using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_electromagnetic_energy_density(
    e_field_json: *const c_char,
    b_field_json: *const c_char,
) -> *mut c_char {
    let e_field: Option<Vector> = from_json_string(e_field_json);

    let b_field: Option<Vector> = from_json_string(b_field_json);

    match (e_field, b_field) {
        | (Some(e), Some(b)) => to_json_string(&electromagnetism::energy_density(&e, &b)),
        | _ => std::ptr::null_mut(),
    }
}