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 numerical complex analysis.

use std::collections::HashMap;
use std::os::raw::c_char;

use num_complex::Complex;
use serde::Deserialize;

use crate::ffi_apis::common::from_json_string;
use crate::ffi_apis::common::to_c_string;
use crate::ffi_apis::ffi_api::FfiResult;
use crate::numerical::complex_analysis;
use crate::symbolic::core::Expr;

#[derive(Deserialize)]
struct EvalInput {
    expr: Expr,
    vars: HashMap<String, Complex<f64>>,
}

/// Evaluates a complex expression using JSON for serialization.
///
/// # 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.
///
/// # Panics
///
/// This function may panic if the FFI input is malformed, null where not expected,
/// or if internal state synchronization fails (e.g., poisoned locks).
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_num_complex_eval_json(input_json: *const c_char) -> *mut c_char {
    let input: EvalInput = match from_json_string(input_json) {
        | Some(i) => i,
        | None => {
            return to_c_string(
                serde_json::to_string(&FfiResult::<Complex<f64>, String> {
                    ok: None,
                    err: Some("Invalid JSON input".to_string()),
                })
                .unwrap(),
            );
        },
    };

    match complex_analysis::eval_complex_expr(&input.expr, &input.vars) {
        | Ok(res) => {
            to_c_string(
                serde_json::to_string(&FfiResult {
                    ok: Some(res),
                    err: None::<String>,
                })
                .unwrap(),
            )
        },
        | Err(e) => {
            to_c_string(
                serde_json::to_string(&FfiResult::<Complex<f64>, String> {
                    ok: None,
                    err: Some(e),
                })
                .unwrap(),
            )
        },
    }
}

#[derive(Deserialize)]
struct ContourInput {
    expr: Expr,
    var: String,
    path: Vec<Complex<f64>>,
}

/// Computes the contour integral of a complex expression using JSON for serialization.
///
/// # 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.
///
/// # Panics
///
/// This function may panic if the FFI input is malformed, null where not expected,
/// or if internal state synchronization fails (e.g., poisoned locks).
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_num_complex_contour_integral_json(
    input_json: *const c_char
) -> *mut c_char {
    let input: ContourInput = match from_json_string(input_json) {
        | Some(i) => i,
        | None => {
            return to_c_string(
                serde_json::to_string(&FfiResult::<Complex<f64>, String> {
                    ok: None,
                    err: Some("Invalid JSON input".to_string()),
                })
                .unwrap(),
            );
        },
    };

    match complex_analysis::contour_integral_expr(&input.expr, &input.var, &input.path) {
        | Ok(res) => {
            to_c_string(
                serde_json::to_string(&FfiResult {
                    ok: Some(res),
                    err: None::<String>,
                })
                .unwrap(),
            )
        },
        | Err(e) => {
            to_c_string(
                serde_json::to_string(&FfiResult::<Complex<f64>, String> {
                    ok: None,
                    err: Some(e),
                })
                .unwrap(),
            )
        },
    }
}