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Copy pathprotocol.rs
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262 lines (231 loc) · 6.73 KB
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use super::IntoFuncArgs;
use crate::{
AsObject, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject, VirtualMachine,
builtins::{PyAnyDict, PyDictRef, iter::PySequenceIterator},
convert::ToPyObject,
object::{Traverse, TraverseFn},
protocol::{PyIter, PyIterIter, PyMapping},
types::GenericMethod,
};
use core::{borrow::Borrow, marker::PhantomData};
#[derive(Clone, Traverse)]
pub struct ArgCallable {
obj: PyObjectRef,
#[pytraverse(skip)]
call: GenericMethod,
}
impl ArgCallable {
#[inline(always)]
pub fn invoke(&self, args: impl IntoFuncArgs, vm: &VirtualMachine) -> PyResult {
let args = args.into_args(vm);
(self.call)(&self.obj, args, vm)
}
}
impl core::fmt::Debug for ArgCallable {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.debug_struct("ArgCallable")
.field("obj", &self.obj)
.field("call", &format!("{:08x}", self.call as usize))
.finish()
}
}
impl Borrow<PyObject> for ArgCallable {
#[inline(always)]
fn borrow(&self) -> &PyObject {
&self.obj
}
}
impl AsRef<PyObject> for ArgCallable {
#[inline(always)]
fn as_ref(&self) -> &PyObject {
&self.obj
}
}
impl From<ArgCallable> for PyObjectRef {
#[inline(always)]
fn from(value: ArgCallable) -> Self {
value.obj
}
}
impl TryFromObject for ArgCallable {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let Some(callable) = obj.to_callable() else {
return Err(vm.new_type_error(format!(
"'{}' object is not callable",
obj.class().slot_name()
)));
};
let call = callable.call;
Ok(Self { obj, call })
}
}
/// An iterable Python object.
///
/// `ArgIterable` implements `FromArgs` so that a built-in function can accept
/// an object that is required to conform to the Python iterator protocol.
///
/// ArgIterable can optionally perform type checking and conversions on iterated
/// objects using a generic type parameter that implements `TryFromObject`.
pub struct ArgIterable<T = PyObjectRef> {
iterable: PyObjectRef,
iter_fn: Option<crate::types::IterFunc>,
_item: PhantomData<T>,
}
unsafe impl<T: Traverse> Traverse for ArgIterable<T> {
fn traverse(&self, tracer_fn: &mut TraverseFn<'_>) {
self.iterable.traverse(tracer_fn)
}
}
impl<T> ArgIterable<T> {
#[must_use]
pub(crate) fn as_object(&self) -> &PyObject {
&self.iterable
}
/// This object's iterator.
///
/// This operation may fail if an exception is raised while invoking the
/// `__iter__` method of the iterable object.
fn get_iter(&self, vm: &VirtualMachine) -> PyResult<PyIter> {
Ok(PyIter::new(match self.iter_fn {
Some(f) => f(self.iterable.clone(), vm)?,
None => PySequenceIterator::new(self.iterable.clone(), vm)?.into_pyobject(vm),
}))
}
/// Returns an iterator over this sequence of objects. See [`PyIter::iter`]
/// for why it does not ask how long the iterator is.
///
/// This operation may fail if an exception is raised while invoking the
/// `__iter__` method of the iterable object.
pub fn iter<'a>(&self, vm: &'a VirtualMachine) -> PyResult<PyIterIter<'a, T>> {
Ok(self.get_iter(vm)?.into_iter(vm))
}
/// [`Self::iter`] for a caller that fills a sized container from the
/// iterator, the way `PySequence_Fast()` does.
pub fn iter_sized<'a>(&self, vm: &'a VirtualMachine) -> PyResult<PyIterIter<'a, T>> {
self.get_iter(vm)?.into_iter_sized(vm)
}
}
impl<T> TryFromObject for ArgIterable<T>
where
T: TryFromObject,
{
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let cls = obj.class();
let iter_fn = cls.slots.iter.load();
if iter_fn.is_none() && !cls.has_attr(identifier!(vm, __getitem__)) {
return Err(vm.new_type_error(format!("'{}' object is not iterable", cls.slot_name())));
}
Ok(Self {
iterable: obj,
iter_fn,
_item: PhantomData,
})
}
}
#[derive(Debug, Clone, Traverse)]
pub struct ArgMapping {
obj: PyObjectRef,
}
impl ArgMapping {
#[inline]
#[must_use]
pub const fn new(obj: PyObjectRef) -> Self {
Self { obj }
}
#[inline(always)]
#[must_use]
pub fn from_dict_exact(dict: PyDictRef) -> Self {
Self { obj: dict.into() }
}
#[inline(always)]
#[must_use]
pub fn from_anydict_exact(dict: PyRef<PyAnyDict>) -> Self {
Self { obj: dict.into() }
}
#[inline(always)]
#[must_use]
pub fn obj(&self) -> &PyObject {
&self.obj
}
#[inline(always)]
#[must_use]
pub fn mapping(&self) -> PyMapping<'_> {
self.obj.mapping_unchecked()
}
}
impl Borrow<PyObject> for ArgMapping {
#[inline(always)]
fn borrow(&self) -> &PyObject {
&self.obj
}
}
impl AsRef<PyObject> for ArgMapping {
#[inline(always)]
fn as_ref(&self) -> &PyObject {
&self.obj
}
}
impl From<ArgMapping> for PyObjectRef {
#[inline(always)]
fn from(value: ArgMapping) -> Self {
value.obj
}
}
impl ToPyObject for ArgMapping {
#[inline(always)]
fn to_pyobject(self, _vm: &VirtualMachine) -> PyObjectRef {
self.obj
}
}
impl TryFromObject for ArgMapping {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let _mapping = obj.try_mapping(vm)?;
Ok(Self { obj })
}
}
// this is not strictly related to PySequence protocol.
#[derive(Clone)]
pub struct ArgSequence<T = PyObjectRef>(Vec<T>);
unsafe impl<T: Traverse> Traverse for ArgSequence<T> {
fn traverse(&self, tracer_fn: &mut TraverseFn<'_>) {
self.0.traverse(tracer_fn);
}
}
impl<T> ArgSequence<T> {
#[inline(always)]
#[must_use]
pub fn into_vec(self) -> Vec<T> {
self.0
}
#[inline(always)]
#[must_use]
pub fn as_slice(&self) -> &[T] {
&self.0
}
}
impl<T> core::ops::Deref for ArgSequence<T> {
type Target = [T];
#[inline(always)]
fn deref(&self) -> &[T] {
self.as_slice()
}
}
impl<'a, T> IntoIterator for &'a ArgSequence<T> {
type Item = &'a T;
type IntoIter = core::slice::Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<T> IntoIterator for ArgSequence<T> {
type Item = T;
type IntoIter = alloc::vec::IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl<T: TryFromObject> TryFromObject for ArgSequence<T> {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
obj.try_to_value(vm).map(Self)
}
}