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::symbolic::convergence::ConvergenceResult;
use crate::symbolic::core::Expr;
use crate::symbolic::series::analytic_continuation;
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 a raw pointer to `Expr` (expression), a C-style string (variable),
/// a raw pointer to `Expr` (center), and a `usize` (order).
/// Returns a raw pointer to a new `Expr` representing the Taylor series.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_taylor_series_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    center: *const Expr,
    order: usize,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let center_ref = unsafe { &*center };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = taylor_series(expr_ref, &var_str, center_ref, order);

    Box::into_raw(Box::new(result))
}

/// Computes the Laurent series expansion of an expression.
///
/// Takes a raw pointer to `Expr` (expression), a C-style string (variable),
/// a raw pointer to `Expr` (center), and a `usize` (order).
/// Returns a raw pointer to a new `Expr` representing the Laurent series.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_laurent_series_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    center: *const Expr,
    order: usize,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let center_ref = unsafe { &*center };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = laurent_series(expr_ref, &var_str, center_ref, order);

    Box::into_raw(Box::new(result))
}

/// Computes the Fourier series expansion of an expression.
///
/// Takes a raw pointer to `Expr` (expression), a C-style string (variable),
/// a raw pointer to `Expr` (period), and a `usize` (order).
/// Returns a raw pointer to a new `Expr` representing the Fourier series.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_fourier_series_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    period: *const Expr,
    order: usize,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let period_ref = unsafe { &*period };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = fourier_series(expr_ref, &var_str, period_ref, order);

    Box::into_raw(Box::new(result))
}

/// Computes the summation of an expression.
///
/// Takes a raw pointer to `Expr` (expression), a C-style string (variable),
/// raw pointers to `Expr` (lower bound), and `Expr` (upper bound).
/// Returns a raw pointer to a new `Expr` representing the summation.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_summation_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    lower: *const Expr,
    upper: *const Expr,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let lower_ref = unsafe { &*lower };

    let upper_ref = unsafe { &*upper };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = summation(expr_ref, &var_str, lower_ref, upper_ref);

    Box::into_raw(Box::new(result))
}

/// Computes the product of an expression.
///
/// Takes a raw pointer to `Expr` (expression), a C-style string (variable),
/// raw pointers to `Expr` (lower bound), and `Expr` (upper bound).
/// Returns a raw pointer to a new `Expr` representing the product.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_product_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    lower: *const Expr,
    upper: *const Expr,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let lower_ref = unsafe { &*lower };

    let upper_ref = unsafe { &*upper };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = product(expr_ref, &var_str, lower_ref, upper_ref);

    Box::into_raw(Box::new(result))
}

/// Analyzes the convergence of a series.
///
/// Takes a raw pointer to `Expr` (series expression) and a C-style string (variable).
/// Returns a raw pointer to a `ConvergenceResult` representing the convergence analysis result.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_series_analyze_convergence_handle(
    series: *const Expr,
    var: *const std::ffi::c_char,
) -> *mut ConvergenceResult {
    let series_ref = unsafe { &*series };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = crate::symbolic::convergence::analyze_convergence(series_ref, &var_str);

    Box::into_raw(Box::new(result))
}

/// Computes the asymptotic expansion of an expression.
///
/// Takes a raw pointer to `Expr` (expression), a C-style string (variable),
/// a raw pointer to `Expr` (point), and a `usize` (order).
/// Returns a raw pointer to a new `Expr` representing the asymptotic expansion.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_asymptotic_expansion_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    point: *const Expr,
    order: usize,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let point_ref = unsafe { &*point };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = asymptotic_expansion(expr_ref, &var_str, point_ref, order);

    Box::into_raw(Box::new(result))
}

/// Computes the analytic continuation of a series.
///
/// Takes a raw pointer to `Expr` (expression), a C-style string (variable),
/// raw pointers to `Expr` (original center), `Expr` (new center), and a `usize` (order).
/// Returns a raw pointer to a new `Expr` representing the analytic continuation.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_analytic_continuation_handle(
    expr: *const Expr,
    var: *const std::ffi::c_char,
    orig_center: *const Expr,
    new_center: *const Expr,
    order: usize,
) -> *mut Expr {
    let expr_ref = unsafe { &*expr };

    let orig_center_ref = unsafe { &*orig_center };

    let new_center_ref = unsafe { &*new_center };

    let var_str = unsafe {
        if var.is_null() {
            return std::ptr::null_mut();
        }

        std::ffi::CStr::from_ptr(var).to_string_lossy().into_owned()
    };

    let result = analytic_continuation(expr_ref, &var_str, orig_center_ref, new_center_ref, order);

    Box::into_raw(Box::new(result))
}