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Merged
merged 1 commit into from
Apr 25, 2024
Merged

GetANext #5270

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37 changes: 33 additions & 4 deletions vm/src/frame.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -994,11 +994,40 @@ impl ExecutingFrame<'_> {
}
bytecode::Instruction::GetANext => {
let aiter = self.top_value();
let awaitable = vm.call_special_method(aiter, identifier!(vm, __anext__), ())?;
let awaitable = if awaitable.payload_is::<PyCoroutine>() {
awaitable
let awaitable = if aiter.class().is(vm.ctx.types.async_generator) {
vm.call_special_method(aiter, identifier!(vm, __anext__), ())?
} else {
vm.call_special_method(&awaitable, identifier!(vm, __await__), ())?
if !aiter.has_attr("__anext__", vm).unwrap_or(false) {
// TODO: __anext__ must be protocol
let msg = format!(
"'async for' requires an iterator with __anext__ method, got {:.100}",
aiter.class().name()
);
return Err(vm.new_type_error(msg));
}
let next_iter =
vm.call_special_method(aiter, identifier!(vm, __anext__), ())?;

// _PyCoro_GetAwaitableIter in CPython
fn get_awaitable_iter(next_iter: &PyObject, vm: &VirtualMachine) -> PyResult {
let gen_is_coroutine = |_| {
// TODO: cpython gen_is_coroutine
true
};
if next_iter.class().is(vm.ctx.types.coroutine_type)
|| gen_is_coroutine(next_iter)
{
return Ok(next_iter.to_owned());
}
// TODO: error handling
vm.call_special_method(next_iter, identifier!(vm, __await__), ())
}
get_awaitable_iter(&next_iter, vm).map_err(|_| {
vm.new_type_error(format!(
"'async for' received an invalid object from __anext__: {:.200}",
next_iter.class().name()
))
})?
};
self.push_value(awaitable);
Ok(None)
Expand Down