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::geometric_algebra::Multivector;

/// Creates a new scalar multivector (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_scalar(
    p: u32,
    q: u32,
    r: u32,
    value_json: *const c_char,
) -> *mut c_char {
    let value: Option<Expr> = from_json_string(value_json);

    if let Some(val) = value {
        let mv = Multivector::scalar((p, q, r), val);

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

/// Computes geometric product (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_geometric_product(
    a_json: *const c_char,
    b_json: *const c_char,
) -> *mut c_char {
    let a: Option<Multivector> = from_json_string(a_json);

    let b: Option<Multivector> = from_json_string(b_json);

    match (a, b) {
        | (Some(mv_a), Some(mv_b)) => {
            let result = mv_a.geometric_product(&mv_b);

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

/// Computes outer product (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_outer_product(
    a_json: *const c_char,
    b_json: *const c_char,
) -> *mut c_char {
    let a: Option<Multivector> = from_json_string(a_json);

    let b: Option<Multivector> = from_json_string(b_json);

    match (a, b) {
        | (Some(mv_a), Some(mv_b)) => {
            let result = mv_a.outer_product(&mv_b);

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

/// Computes inner product (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_inner_product(
    a_json: *const c_char,
    b_json: *const c_char,
) -> *mut c_char {
    let a: Option<Multivector> = from_json_string(a_json);

    let b: Option<Multivector> = from_json_string(b_json);

    match (a, b) {
        | (Some(mv_a), Some(mv_b)) => {
            let result = mv_a.inner_product(&mv_b);

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

/// Computes reverse (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_reverse(mv_json: *const c_char) -> *mut c_char {
    let mv: Option<Multivector> = from_json_string(mv_json);

    if let Some(multivector) = mv {
        let result = multivector.reverse();

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

/// Computes grade projection (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_grade_projection(
    mv_json: *const c_char,
    grade: u32,
) -> *mut c_char {
    let mv: Option<Multivector> = from_json_string(mv_json);

    if let Some(multivector) = mv {
        let result = multivector.grade_projection(grade);

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

/// Computes magnitude (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_multivector_magnitude(mv_json: *const c_char) -> *mut c_char {
    let mv: Option<Multivector> = from_json_string(mv_json);

    if let Some(multivector) = mv {
        let result = multivector.magnitude();

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