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::core::Expr;
use crate::symbolic::quantum_field_theory;

/// Computes the Dirac adjoint of a fermion field.
///
/// # 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_dirac_adjoint(psi: *const Expr) -> *mut Expr {
    unsafe {
        if psi.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::dirac_adjoint(&*psi)))
    }
}

/// Computes the Feynman slash notation.
///
/// # 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_feynman_slash(v_mu: *const Expr) -> *mut Expr {
    unsafe {
        if v_mu.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::feynman_slash(&*v_mu)))
    }
}

/// Lagrangian density for a free real scalar field.
///
/// # 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_scalar_field_lagrangian(
    phi: *const Expr,
    m: *const Expr,
) -> *mut Expr {
    unsafe {
        if phi.is_null() || m.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::scalar_field_lagrangian(
            &*phi, &*m,
        )))
    }
}

/// Lagrangian density for QED.
///
/// # 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_qed_lagrangian(
    psi_bar: *const Expr,
    psi: *const Expr,
    a_mu: *const Expr,
    m: *const Expr,
    e: *const Expr,
) -> *mut Expr {
    unsafe {
        if psi_bar.is_null() || psi.is_null() || a_mu.is_null() || m.is_null() || e.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::qed_lagrangian(
            &*psi_bar, &*psi, &*a_mu, &*m, &*e,
        )))
    }
}

/// Lagrangian density for QCD.
///
/// # 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_qcd_lagrangian(
    psi_bar: *const Expr,
    psi: *const Expr,
    g_mu: *const Expr,
    m: *const Expr,
    gs: *const Expr,
) -> *mut Expr {
    unsafe {
        if psi_bar.is_null() || psi.is_null() || g_mu.is_null() || m.is_null() || gs.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::qcd_lagrangian(
            &*psi_bar, &*psi, &*g_mu, &*m, &*gs,
        )))
    }
}

/// Computes a propagator for a particle in QFT.
///
/// # 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_qft_propagator(
    p: *const Expr,
    m: *const Expr,
    is_fermion: bool,
) -> *mut Expr {
    unsafe {
        if p.is_null() || m.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::propagator(
            &*p, &*m, is_fermion,
        )))
    }
}

/// Scattering cross-section.
///
/// # 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_qft_scattering_cross_section(
    matrix_element: *const Expr,
    flux: *const Expr,
    phase_space: *const Expr,
) -> *mut Expr {
    unsafe {
        if matrix_element.is_null() || flux.is_null() || phase_space.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(quantum_field_theory::scattering_cross_section(
            &*matrix_element,
            &*flux,
            &*phase_space,
        )))
    }
}

/// Feynman propagator in position space.
///
/// # 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_feynman_propagator_position_space(
    x: *const Expr,
    y: *const Expr,
    m: *const Expr,
) -> *mut Expr {
    unsafe {
        if x.is_null() || y.is_null() || m.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(
            quantum_field_theory::feynman_propagator_position_space(&*x, &*y, &*m),
        ))
    }
}