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 thermodynamics 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::thermodynamics;

/// Calculates ideal gas Law using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_ideal_gas_law(
    p_json: *const c_char,
    v_json: *const c_char,
    n_json: *const c_char,
    r_json: *const c_char,
    t_json: *const c_char,
) -> *mut c_char {
    let p: Option<Expr> = from_json_string(p_json);

    let v: Option<Expr> = from_json_string(v_json);

    let n: Option<Expr> = from_json_string(n_json);

    let r: Option<Expr> = from_json_string(r_json);

    let t: Option<Expr> = from_json_string(t_json);

    match (p, v, n, r, t) {
        | (Some(p), Some(v), Some(n), Some(r), Some(t)) => {
            to_json_string(&thermodynamics::ideal_gas_law(&p, &v, &n, &r, &t))
        },
        | _ => std::ptr::null_mut(),
    }
}

/// Calculates Gibbs Free Energy using JSON.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_gibbs_free_energy(
    h_json: *const c_char,
    t_json: *const c_char,
    s_json: *const c_char,
) -> *mut c_char {
    let h: Option<Expr> = from_json_string(h_json);

    let t: Option<Expr> = from_json_string(t_json);

    let s: Option<Expr> = from_json_string(s_json);

    match (h, t, s) {
        | (Some(h), Some(t), Some(s)) => {
            to_json_string(&thermodynamics::gibbs_free_energy(&h, &t, &s))
        },
        | _ => std::ptr::null_mut(),
    }
}