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 crate::ffi_apis::common::from_json_string;
use crate::ffi_apis::common::to_json_string;
use crate::symbolic::core::Expr;
use crate::symbolic::differential_geometry::DifferentialForm;
use crate::symbolic::differential_geometry::boundary;
use crate::symbolic::differential_geometry::exterior_derivative;
use crate::symbolic::differential_geometry::gauss_theorem;
use crate::symbolic::differential_geometry::generalized_stokes_theorem;
use crate::symbolic::differential_geometry::greens_theorem;
use crate::symbolic::differential_geometry::stokes_theorem;
use crate::symbolic::differential_geometry::wedge_product;
use crate::symbolic::vector::Vector;

/// Computes the exterior derivative of a differential form (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_exterior_derivative(
    form_json: *const std::os::raw::c_char,
    vars_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let form: Option<DifferentialForm> = from_json_string(form_json);

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

    match (form, vars) {
        | (Some(f), Some(v)) => {
            let vars_refs: Vec<&str> = v.iter().map(std::string::String::as_str).collect();

            let result = exterior_derivative(&f, &vars_refs);

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

/// Computes the wedge product of two differential forms (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_wedge_product(
    form1_json: *const std::os::raw::c_char,
    form2_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let form1: Option<DifferentialForm> = from_json_string(form1_json);

    let form2: Option<DifferentialForm> = from_json_string(form2_json);

    match (form1, form2) {
        | (Some(f1), Some(f2)) => {
            let result = wedge_product(&f1, &f2);

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

/// Computes the boundary of a domain (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_boundary(
    domain_json: *const std::os::raw::c_char
) -> *mut std::os::raw::c_char {
    let domain: Option<Expr> = from_json_string(domain_json);

    if let Some(d) = domain {
        let result = boundary(&d);

        to_json_string(&result)
    } else {
        std::ptr::null_mut()
    }
}

/// Represents the generalized Stokes' theorem (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_generalized_stokes_theorem(
    omega_json: *const std::os::raw::c_char,
    manifold_json: *const std::os::raw::c_char,
    vars_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let omega: Option<DifferentialForm> = from_json_string(omega_json);

    let manifold: Option<Expr> = from_json_string(manifold_json);

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

    match (omega, manifold, vars) {
        | (Some(o), Some(m), Some(v)) => {
            let vars_refs: Vec<&str> = v.iter().map(std::string::String::as_str).collect();

            let result = generalized_stokes_theorem(&o, &m, &vars_refs);

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

/// Represents Gauss's theorem (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_gauss_theorem(
    vector_field_json: *const std::os::raw::c_char,
    volume_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let vector_field: Option<Vector> = from_json_string(vector_field_json);

    let volume: Option<Expr> = from_json_string(volume_json);

    match (vector_field, volume) {
        | (Some(vf), Some(vol)) => {
            let result = gauss_theorem(&vf, &vol);

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

/// Represents Stokes' theorem (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_stokes_theorem(
    vector_field_json: *const std::os::raw::c_char,
    surface_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let vector_field: Option<Vector> = from_json_string(vector_field_json);

    let surface: Option<Expr> = from_json_string(surface_json);

    match (vector_field, surface) {
        | (Some(vf), Some(surf)) => {
            let result = stokes_theorem(&vf, &surf);

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

/// Represents Green's theorem (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_greens_theorem(
    p_json: *const std::os::raw::c_char,
    q_json: *const std::os::raw::c_char,
    domain_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let p: Option<Expr> = from_json_string(p_json);

    let q: Option<Expr> = from_json_string(q_json);

    let domain: Option<Expr> = from_json_string(domain_json);

    match (p, q, domain) {
        | (Some(p_expr), Some(q_expr), Some(d)) => {
            let result = greens_theorem(&p_expr, &q_expr, &d);

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