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::os::raw::c_char;

use crate::ffi_apis::common::to_json_string;
use crate::symbolic::discrete_groups::cyclic_group;
use crate::symbolic::discrete_groups::dihedral_group;
use crate::symbolic::discrete_groups::klein_four_group;
use crate::symbolic::discrete_groups::symmetric_group;

/// Creates a cyclic group of order `n` and returns it as a JSON string.
///
/// # Arguments
/// * `n` - The order of the cyclic group.
///
/// # Returns
/// A raw pointer to a JSON string representing the group.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_json_cyclic_group_create(n: usize) -> *mut c_char {
    let group = cyclic_group(n);

    to_json_string(&group)
}

/// Creates a dihedral group of order `2n` and returns it as a JSON string.
///
/// # Arguments
/// * `n` - The parameter defining the dihedral group $`D_n`$.
///
/// # Returns
/// A raw pointer to a JSON string representing the group.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_json_dihedral_group_create(n: usize) -> *mut c_char {
    let group = dihedral_group(n);

    to_json_string(&group)
}

/// Creates a symmetric group of degree `n` and returns it as a JSON string.
///
/// # Arguments
/// * `n` - The number of symbols the group acts on.
///
/// # Returns
/// A raw pointer to a JSON string representing the group, or NULL if `n` is invalid.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_json_symmetric_group_create(n: usize) -> *mut c_char {
    match symmetric_group(n) {
        | Ok(group) => to_json_string(&group),
        | Err(_) => std::ptr::null_mut(),
    }
}

/// Creates a Klein four-group and returns it as a JSON string.
///
/// # Returns
/// A raw pointer to a JSON string representing the group.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_json_klein_four_group_create() -> *mut c_char {
    let group = klein_four_group();

    to_json_string(&group)
}