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use std::ffi::{CStr, CString};
use crate::derive_utils::PyFunctionArguments;
use crate::exceptions::PyValueError;
use crate::prelude::*;
use crate::{ffi, AsPyPointer, PyMethodDef, PyMethodType};
#[repr(transparent)]
pub struct PyCFunction(PyAny);
pyobject_native_var_type!(PyCFunction, ffi::PyCFunction_Type, ffi::PyCFunction_Check);
fn get_name(name: &str) -> PyResult<&'static CStr> {
let cstr = CString::new(name)
.map_err(|_| PyValueError::new_err("Function name cannot contain contain NULL byte."))?;
Ok(Box::leak(cstr.into_boxed_c_str()))
}
fn get_doc(doc: &str) -> PyResult<&'static CStr> {
let cstr = CString::new(doc)
.map_err(|_| PyValueError::new_err("Document cannot contain contain NULL byte."))?;
Ok(Box::leak(cstr.into_boxed_c_str()))
}
impl PyCFunction {
pub fn new_with_keywords<'a>(
fun: ffi::PyCFunctionWithKeywords,
name: &str,
doc: &str,
py_or_module: PyFunctionArguments<'a>,
) -> PyResult<&'a Self> {
Self::internal_new(
get_name(name)?,
get_doc(doc)?,
PyMethodType::PyCFunctionWithKeywords(fun),
ffi::METH_VARARGS | ffi::METH_KEYWORDS,
py_or_module,
)
}
pub fn new<'a>(
fun: ffi::PyCFunction,
name: &str,
doc: &str,
py_or_module: PyFunctionArguments<'a>,
) -> PyResult<&'a Self> {
Self::internal_new(
get_name(name)?,
get_doc(doc)?,
PyMethodType::PyCFunction(fun),
ffi::METH_NOARGS,
py_or_module,
)
}
#[doc(hidden)]
pub fn internal_new<'a>(
name: &'static CStr,
doc: &'static CStr,
method_type: PyMethodType,
flags: std::os::raw::c_int,
py_or_module: PyFunctionArguments<'a>,
) -> PyResult<&'a Self> {
let (py, module) = py_or_module.into_py_and_maybe_module();
let method_def = PyMethodDef {
ml_name: name,
ml_meth: method_type,
ml_flags: flags,
ml_doc: doc,
};
let def = method_def.as_method_def();
let (mod_ptr, module_name) = if let Some(m) = module {
let mod_ptr = m.as_ptr();
let name = m.name()?.into_py(py);
(mod_ptr, name.as_ptr())
} else {
(std::ptr::null_mut(), std::ptr::null_mut())
};
unsafe {
py.from_owned_ptr_or_err::<PyCFunction>(ffi::PyCFunction_NewEx(
Box::into_raw(Box::new(def)),
mod_ptr,
module_name,
))
}
}
}
#[repr(transparent)]
pub struct PyFunction(PyAny);
#[cfg(not(Py_LIMITED_API))]
pyobject_native_var_type!(PyFunction, ffi::PyFunction_Type, ffi::PyFunction_Check);