use crate::{ffi, PyAny, PyDowncastError, PyTryFrom, Python};
#[repr(transparent)]
pub struct PyEllipsis(PyAny);
pyobject_native_type_named!(PyEllipsis);
pyobject_native_type_extract!(PyEllipsis);
impl PyEllipsis {
#[inline]
pub fn get(py: Python<'_>) -> &PyEllipsis {
unsafe { py.from_borrowed_ptr(ffi::Py_Ellipsis()) }
}
}
impl<'v> PyTryFrom<'v> for PyEllipsis {
fn try_from<V: Into<&'v PyAny>>(value: V) -> Result<&'v Self, crate::PyDowncastError<'v>> {
let value: &PyAny = value.into();
if unsafe { ffi::Py_Ellipsis() == value.as_ptr() } {
return unsafe { Ok(value.downcast_unchecked()) };
}
Err(PyDowncastError::new(value, "ellipsis"))
}
fn try_from_exact<V: Into<&'v PyAny>>(
value: V,
) -> Result<&'v Self, crate::PyDowncastError<'v>> {
value.into().downcast()
}
unsafe fn try_from_unchecked<V: Into<&'v PyAny>>(value: V) -> &'v Self {
let ptr = value.into() as *const _ as *const PyEllipsis;
&*ptr
}
}
#[cfg(test)]
mod tests {
use crate::types::{PyDict, PyEllipsis};
use crate::Python;
#[test]
fn test_ellipsis_is_itself() {
Python::with_gil(|py| {
assert!(PyEllipsis::get(py)
.downcast::<PyEllipsis>()
.unwrap()
.is_ellipsis());
})
}
#[test]
fn test_dict_is_not_ellipsis() {
Python::with_gil(|py| {
assert!(PyDict::new(py).downcast::<PyEllipsis>().is_err());
})
}
}