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::topology::Simplex;
use crate::symbolic::topology::SimplicialComplex;
use crate::symbolic::topology::SymbolicChain;

/// Creates a new Simplex (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_simplex_create(
    vertices_json: *const std::os::raw::c_char
) -> *mut std::os::raw::c_char {
    let vertices: Option<Vec<usize>> = from_json_string(vertices_json);

    if let Some(v) = vertices {
        let simplex = Simplex::new(&v);

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

/// Gets the dimension of a Simplex (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_simplex_dimension(
    simplex_json: *const std::os::raw::c_char
) -> *mut std::os::raw::c_char {
    let simplex: Option<Simplex> = from_json_string(simplex_json);

    if let Some(s) = simplex {
        to_json_string(&s.dimension())
    } else {
        std::ptr::null_mut()
    }
}

/// Creates a new `SimplicialComplex` (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_simplicial_complex_create() -> *mut std::os::raw::c_char {
    let complex = SimplicialComplex::new();

    to_json_string(&complex)
}

/// Adds a simplex to a `SimplicialComplex` (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_simplicial_complex_add_simplex(
    complex_json: *const std::os::raw::c_char,
    vertices_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let complex: Option<SimplicialComplex> = from_json_string(complex_json);

    let vertices: Option<Vec<usize>> = from_json_string(vertices_json);

    if let (Some(mut c), Some(v)) = (complex, vertices) {
        c.add_simplex(&v);

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

/// Gets the symbolic boundary matrix for dimension k (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_simplicial_complex_get_symbolic_boundary_matrix(
    complex_json: *const std::os::raw::c_char,
    k: usize,
) -> *mut std::os::raw::c_char {
    let complex: Option<SimplicialComplex> = from_json_string(complex_json);

    if let Some(c) = complex {
        match c.get_symbolic_boundary_matrix(k) {
            | Some(expr) => to_json_string(&expr),
            | None => std::ptr::null_mut(),
        }
    } else {
        std::ptr::null_mut()
    }
}

/// Creates a new `SymbolicChain` (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_symbolic_chain_create(dimension: usize) -> *mut std::os::raw::c_char {
    let chain = SymbolicChain::new(dimension);

    to_json_string(&chain)
}

/// Adds a term to a `SymbolicChain` (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_symbolic_chain_add_term(
    chain_json: *const std::os::raw::c_char,
    simplex_json: *const std::os::raw::c_char,
    coeff_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let chain: Option<SymbolicChain> = from_json_string(chain_json);

    let simplex: Option<Simplex> = from_json_string(simplex_json);

    let coeff: Option<Expr> = from_json_string(coeff_json);

    match (chain, simplex, coeff) {
        | (Some(mut c), Some(s), Some(coeff)) => {
            match c.add_term(s, coeff) {
                | Ok(()) => to_json_string(&c),
                | Err(_) => std::ptr::null_mut(),
            }
        },
        | _ => std::ptr::null_mut(),
    }
}

/// Applies the symbolic boundary operator to a `SymbolicChain` (JSON)
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_simplicial_complex_apply_symbolic_boundary_operator(
    complex_json: *const std::os::raw::c_char,
    chain_json: *const std::os::raw::c_char,
) -> *mut std::os::raw::c_char {
    let complex: Option<SimplicialComplex> = from_json_string(complex_json);

    let chain: Option<SymbolicChain> = from_json_string(chain_json);

    match (complex, chain) {
        | (Some(c), Some(ch)) => {
            match c.apply_symbolic_boundary_operator(&ch) {
                | Some(result) => to_json_string(&result),
                | None => std::ptr::null_mut(),
            }
        },
        | _ => std::ptr::null_mut(),
    }
}