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 relativity 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::relativity;

/// Calculates Lorentz factor using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_lorentz_factor(velocity_json: *const c_char) -> *mut c_char {
    let velocity: Option<Expr> = from_json_string(velocity_json);

    if let Some(v) = velocity {
        to_json_string(&relativity::lorentz_factor(&v))
    } else {
        std::ptr::null_mut()
    }
}

/// Calculates mass-energy equivalence using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_mass_energy_equivalence(mass_json: *const c_char) -> *mut c_char {
    let mass: Option<Expr> = from_json_string(mass_json);

    if let Some(m) = mass {
        to_json_string(&relativity::mass_energy_equivalence(&m))
    } else {
        std::ptr::null_mut()
    }
}

/// Calculates Schwarzschild radius using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_schwarzschild_radius(mass_json: *const c_char) -> *mut c_char {
    let mass: Option<Expr> = from_json_string(mass_json);

    if let Some(m) = mass {
        to_json_string(&relativity::schwarzschild_radius(&m))
    } else {
        std::ptr::null_mut()
    }
}