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use crate::callback::IntoPyCallbackOutput;
use crate::derive_utils::TryFromPyCell;
use crate::err::PyResult;
use crate::{ffi, IntoPy, IntoPyPointer, PyClass, PyObject, Python};
#[allow(unused_variables)]
pub trait PyIterProtocol<'p>: PyClass {
fn __iter__(slf: Self::Receiver) -> Self::Result
where
Self: PyIterIterProtocol<'p>,
{
unimplemented!()
}
fn __next__(slf: Self::Receiver) -> Self::Result
where
Self: PyIterNextProtocol<'p>,
{
unimplemented!()
}
}
pub trait PyIterIterProtocol<'p>: PyIterProtocol<'p> {
type Receiver: TryFromPyCell<'p, Self>;
type Result: IntoPyCallbackOutput<PyObject>;
}
pub trait PyIterNextProtocol<'p>: PyIterProtocol<'p> {
type Receiver: TryFromPyCell<'p, Self>;
type Result: IntoPyCallbackOutput<PyIterNextOutput>;
}
py_unarys_func!(iter, PyIterIterProtocol, Self::__iter__);
py_unarys_func!(iternext, PyIterNextProtocol, Self::__next__);
pub enum IterNextOutput<T, U> {
Yield(T),
Return(U),
}
pub type PyIterNextOutput = IterNextOutput<PyObject, PyObject>;
impl IntoPyCallbackOutput<*mut ffi::PyObject> for PyIterNextOutput {
fn convert(self, _py: Python) -> PyResult<*mut ffi::PyObject> {
match self {
IterNextOutput::Yield(o) => Ok(o.into_ptr()),
IterNextOutput::Return(opt) => Err(crate::exceptions::PyStopIteration::new_err((opt,))),
}
}
}
impl<T, U> IntoPyCallbackOutput<PyIterNextOutput> for IterNextOutput<T, U>
where
T: IntoPy<PyObject>,
U: IntoPy<PyObject>,
{
fn convert(self, py: Python) -> PyResult<PyIterNextOutput> {
match self {
IterNextOutput::Yield(o) => Ok(IterNextOutput::Yield(o.into_py(py))),
IterNextOutput::Return(o) => Ok(IterNextOutput::Return(o.into_py(py))),
}
}
}
impl<T> IntoPyCallbackOutput<PyIterNextOutput> for Option<T>
where
T: IntoPy<PyObject>,
{
fn convert(self, py: Python) -> PyResult<PyIterNextOutput> {
match self {
Some(o) => Ok(PyIterNextOutput::Yield(o.into_py(py))),
None => Ok(PyIterNextOutput::Return(py.None())),
}
}
}