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::series::analytic_continuation;
use crate::symbolic::series::analyze_convergence;
use crate::symbolic::series::asymptotic_expansion;
use crate::symbolic::series::fourier_series;
use crate::symbolic::series::laurent_series;
use crate::symbolic::series::product;
use crate::symbolic::series::summation;
use crate::symbolic::series::taylor_series;

/// Computes the Taylor series expansion of an expression.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (center), and `usize` (order).
/// Returns a JSON string representing the `Expr` of the Taylor series.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_taylor_series(
    expr_json: *const c_char,
    var_json: *const c_char,
    center_json: *const c_char,
    order_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let center: Option<Expr> = from_json_string(center_json);

    let order: Option<usize> = from_json_string(order_json);

    match (expr, var, center, order) {
        | (Some(e), Some(v), Some(c), Some(o)) => {
            let result = taylor_series(&e, &v, &c, o);

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

/// Computes the Laurent series expansion of an expression.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (center), and `usize` (order).
/// Returns a JSON string representing the `Expr` of the Laurent series.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_laurent_series(
    expr_json: *const c_char,
    var_json: *const c_char,
    center_json: *const c_char,
    order_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let center: Option<Expr> = from_json_string(center_json);

    let order: Option<usize> = from_json_string(order_json);

    match (expr, var, center, order) {
        | (Some(e), Some(v), Some(c), Some(o)) => {
            let result = laurent_series(&e, &v, &c, o);

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

/// Computes the Fourier series expansion of an expression.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (period), and `usize` (order).
/// Returns a JSON string representing the `Expr` of the Fourier series.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_fourier_series(
    expr_json: *const c_char,
    var_json: *const c_char,
    period_json: *const c_char,
    order_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let period: Option<Expr> = from_json_string(period_json);

    let order: Option<usize> = from_json_string(order_json);

    match (expr, var, period, order) {
        | (Some(e), Some(v), Some(p), Some(o)) => {
            let result = fourier_series(&e, &v, &p, o);

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

/// Computes the summation of an expression.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (lower bound), and `Expr` (upper bound).
/// Returns a JSON string representing the `Expr` of the summation.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_summation(
    expr_json: *const c_char,
    var_json: *const c_char,
    lower_json: *const c_char,
    upper_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let lower: Option<Expr> = from_json_string(lower_json);

    let upper: Option<Expr> = from_json_string(upper_json);

    match (expr, var, lower, upper) {
        | (Some(e), Some(v), Some(l), Some(u)) => {
            let result = summation(&e, &v, &l, &u);

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

/// Computes the product of an expression.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (lower bound), and `Expr` (upper bound).
/// Returns a JSON string representing the `Expr` of the product.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_product(
    expr_json: *const c_char,
    var_json: *const c_char,
    lower_json: *const c_char,
    upper_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let lower: Option<Expr> = from_json_string(lower_json);

    let upper: Option<Expr> = from_json_string(upper_json);

    match (expr, var, lower, upper) {
        | (Some(e), Some(v), Some(l), Some(u)) => {
            let result = product(&e, &v, &l, &u);

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

/// Analyzes the convergence of a series.
///
/// Takes JSON strings representing `Expr` (series expression) and `String` (variable).
/// Returns a JSON string representing the `Expr` of the convergence analysis result.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_series_json_analyze_convergence(
    series_json: *const c_char,
    var_json: *const c_char,
) -> *mut c_char {
    let series: Option<Expr> = from_json_string(series_json);

    let var: Option<String> = from_json_string(var_json);

    match (series, var) {
        | (Some(s), Some(v)) => {
            let result = analyze_convergence(&s, &v);

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

/// Computes the asymptotic expansion of an expression.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (point), and `usize` (order).
/// Returns a JSON string representing the `Expr` of the asymptotic expansion.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_asymptotic_expansion(
    expr_json: *const c_char,
    var_json: *const c_char,
    point_json: *const c_char,
    order_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let point: Option<Expr> = from_json_string(point_json);

    let order: Option<usize> = from_json_string(order_json);

    match (expr, var, point, order) {
        | (Some(e), Some(v), Some(p), Some(o)) => {
            let result = asymptotic_expansion(&e, &v, &p, o);

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

/// Computes the analytic continuation of a series.
///
/// Takes JSON strings representing `Expr` (expression), `String` (variable),
/// `Expr` (original center), `Expr` (new center), and `usize` (order).
/// Returns a JSON string representing the `Expr` of the analytic continuation.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_analytic_continuation(
    expr_json: *const c_char,
    var_json: *const c_char,
    orig_center_json: *const c_char,
    new_center_json: *const c_char,
    order_json: *const c_char,
) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    let var: Option<String> = from_json_string(var_json);

    let orig_center: Option<Expr> = from_json_string(orig_center_json);

    let new_center: Option<Expr> = from_json_string(new_center_json);

    let order: Option<usize> = from_json_string(order_json);

    match (expr, var, orig_center, new_center, order) {
        | (Some(e), Some(v), Some(oc), Some(nc), Some(o)) => {
            let result = analytic_continuation(&e, &v, &oc, &nc, o);

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