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Copy pathset.rs
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896 lines (782 loc) · 25.6 KB
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/*
* Builtin set type with a sequence of unique items.
*/
use super::{pytype::PyTypeRef, IterStatus, PyDictRef};
use crate::common::hash::PyHash;
use crate::common::rc::PyRc;
use crate::dictdatatype;
use crate::dictdatatype::DictSize;
use crate::function::{ArgIterable, FuncArgs, OptionalArg, PosArgs};
use crate::slots::{
Comparable, Hashable, Iterable, IteratorIterable, PyComparisonOp, PyIter, SlotConstructor,
Unhashable,
};
use crate::vm::{ReprGuard, VirtualMachine};
use crate::{
IdProtocol, PyClassImpl, PyComparisonValue, PyContext, PyObjectRef, PyRef, PyResult, PyValue,
TryFromObject, TypeProtocol,
};
use crossbeam_utils::atomic::AtomicCell;
use std::fmt;
pub type SetContentType = dictdatatype::Dict<()>;
/// set() -> new empty set object
/// set(iterable) -> new set object
///
/// Build an unordered collection of unique elements.
#[pyclass(module = false, name = "set")]
#[derive(Default)]
pub struct PySet {
inner: PySetInner,
}
pub type PySetRef = PyRef<PySet>;
/// frozenset() -> empty frozenset object
/// frozenset(iterable) -> frozenset object
///
/// Build an immutable unordered collection of unique elements.
#[pyclass(module = false, name = "frozenset")]
#[derive(Default)]
pub struct PyFrozenSet {
inner: PySetInner,
}
impl fmt::Debug for PySet {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// TODO: implement more detailed, non-recursive Debug formatter
f.write_str("set")
}
}
impl fmt::Debug for PyFrozenSet {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// TODO: implement more detailed, non-recursive Debug formatter
f.write_str("frozenset")
}
}
impl PyValue for PySet {
fn class(vm: &VirtualMachine) -> &PyTypeRef {
&vm.ctx.types.set_type
}
}
impl PyValue for PyFrozenSet {
fn class(vm: &VirtualMachine) -> &PyTypeRef {
&vm.ctx.types.frozenset_type
}
}
#[derive(Default, Clone)]
struct PySetInner {
content: PyRc<SetContentType>,
}
impl PySetInner {
fn new(iterable: ArgIterable, vm: &VirtualMachine) -> PyResult<PySetInner> {
let set = PySetInner::default();
for item in iterable.iter(vm)? {
set.add(item?, vm)?;
}
Ok(set)
}
fn len(&self) -> usize {
self.content.len()
}
fn sizeof(&self) -> usize {
self.content.sizeof()
}
fn copy(&self) -> PySetInner {
PySetInner {
content: PyRc::new((*self.content).clone()),
}
}
fn contains(&self, needle: &PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
self.retry_op_with_frozenset(needle, vm, |needle, vm| self.content.contains(vm, needle))
}
fn compare(
&self,
other: &PySetInner,
op: PyComparisonOp,
vm: &VirtualMachine,
) -> PyResult<bool> {
if op == PyComparisonOp::Ne {
return self.compare(other, PyComparisonOp::Eq, vm).map(|eq| !eq);
}
if !op.eval_ord(self.len().cmp(&other.len())) {
return Ok(false);
}
let (superset, subset) = if matches!(op, PyComparisonOp::Lt | PyComparisonOp::Le) {
(other, self)
} else {
(self, other)
};
for key in subset.elements() {
if !superset.contains(&key, vm)? {
return Ok(false);
}
}
Ok(true)
}
fn union(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<PySetInner> {
let set = self.clone();
for item in other.iter(vm)? {
set.add(item?, vm)?;
}
Ok(set)
}
fn intersection(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<PySetInner> {
let set = PySetInner::default();
for item in other.iter(vm)? {
let obj = item?;
if self.contains(&obj, vm)? {
set.add(obj, vm)?;
}
}
Ok(set)
}
fn difference(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<PySetInner> {
let set = self.copy();
for item in other.iter(vm)? {
set.content.delete_if_exists(vm, &item?)?;
}
Ok(set)
}
fn symmetric_difference(
&self,
other: ArgIterable,
vm: &VirtualMachine,
) -> PyResult<PySetInner> {
let new_inner = self.clone();
// We want to remove duplicates in other
let other_set = Self::new(other, vm)?;
for item in other_set.elements() {
new_inner.content.delete_or_insert(vm, &item, ())?
}
Ok(new_inner)
}
fn issuperset(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
for item in other.iter(vm)? {
if !self.contains(&item?, vm)? {
return Ok(false);
}
}
Ok(true)
}
fn issubset(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
let other_set = PySetInner::new(other, vm)?;
self.compare(&other_set, PyComparisonOp::Le, vm)
}
fn isdisjoint(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
for item in other.iter(vm)? {
if self.contains(&item?, vm)? {
return Ok(false);
}
}
Ok(true)
}
fn iter(&self) -> PySetIterator {
PySetIterator {
dict: PyRc::clone(&self.content),
size: self.content.size(),
position: AtomicCell::new(0),
status: AtomicCell::new(IterStatus::Active),
}
}
fn repr(&self, vm: &VirtualMachine) -> PyResult<String> {
let mut str_parts = Vec::with_capacity(self.content.len());
for key in self.elements() {
let part = vm.to_repr(&key)?;
str_parts.push(part.as_str().to_owned());
}
Ok(format!("{{{}}}", str_parts.join(", ")))
}
fn add(&self, item: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
self.content.insert(vm, item, ())
}
fn remove(&self, item: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
self.retry_op_with_frozenset(&item, vm, |item, vm| self.content.delete(vm, item.clone()))
}
fn discard(&self, item: &PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
self.retry_op_with_frozenset(item, vm, |item, vm| self.content.delete_if_exists(vm, item))
}
fn clear(&self) {
self.content.clear()
}
fn elements(&self) -> Vec<PyObjectRef> {
self.content.keys()
}
fn pop(&self, vm: &VirtualMachine) -> PyResult {
// TODO: should be pop_front, but that requires rearranging every index
if let Some((key, _)) = self.content.pop_back() {
Ok(key)
} else {
let err_msg = vm
.ctx
.new_ascii_literal(crate::utils::ascii!("pop from an empty set"));
Err(vm.new_key_error(err_msg))
}
}
fn update(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<()> {
for iterable in others {
for item in iterable.iter(vm)? {
self.add(item?, vm)?;
}
}
Ok(())
}
fn intersection_update(
&self,
others: PosArgs<ArgIterable>,
vm: &VirtualMachine,
) -> PyResult<()> {
let mut temp_inner = self.copy();
self.clear();
for iterable in others {
for item in iterable.iter(vm)? {
let obj = item?;
if temp_inner.contains(&obj, vm)? {
self.add(obj, vm)?;
}
}
temp_inner = self.copy()
}
Ok(())
}
fn difference_update(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<()> {
for iterable in others {
for item in iterable.iter(vm)? {
self.content.delete_if_exists(vm, &item?)?;
}
}
Ok(())
}
fn symmetric_difference_update(
&self,
others: PosArgs<ArgIterable>,
vm: &VirtualMachine,
) -> PyResult<()> {
for iterable in others {
// We want to remove duplicates in iterable
let iterable_set = Self::new(iterable, vm)?;
for item in iterable_set.elements() {
self.content.delete_or_insert(vm, &item, ())?;
}
}
Ok(())
}
fn hash(&self, vm: &VirtualMachine) -> PyResult<PyHash> {
crate::utils::hash_iter_unordered(self.elements().iter(), vm)
}
// Run operation, on failure, if item is a set/set subclass, convert it
// into a frozenset and try the operation again. Propagates original error
// on failure to convert and restores item in KeyError on failure (remove).
fn retry_op_with_frozenset<T, F>(
&self,
item: &PyObjectRef,
vm: &VirtualMachine,
op: F,
) -> PyResult<T>
where
F: Fn(&PyObjectRef, &VirtualMachine) -> PyResult<T>,
{
op(item, vm).or_else(|original_err| {
item.payload_if_subclass::<PySet>(vm)
// Keep original error around.
.ok_or(original_err)
.and_then(|set| {
op(
&PyFrozenSet {
inner: set.inner.copy(),
}
.into_object(vm),
vm,
)
// If operation raised KeyError, report original set (set.remove)
.map_err(|op_err| {
if op_err.isinstance(&vm.ctx.exceptions.key_error) {
vm.new_key_error(item.clone())
} else {
op_err
}
})
})
})
}
}
fn extract_set(obj: &PyObjectRef) -> Option<&PySetInner> {
match_class!(match obj {
ref set @ PySet => Some(&set.inner),
ref frozen @ PyFrozenSet => Some(&frozen.inner),
_ => None,
})
}
fn reduce_set(
zelf: &PyObjectRef,
vm: &VirtualMachine,
) -> PyResult<(PyTypeRef, PyObjectRef, Option<PyDictRef>)> {
Ok((
zelf.clone_class(),
vm.ctx.new_tuple(vec![vm.ctx.new_list(
extract_set(zelf)
.unwrap_or(&PySetInner::default())
.elements(),
)]),
zelf.dict(),
))
}
macro_rules! multi_args_set {
($vm:expr, $others:expr, $zelf:expr, $op:tt) => {{
let mut res = $zelf.inner.copy();
for other in $others {
res = res.$op(other, $vm)?
}
Ok(Self { inner: res })
}};
}
#[pyimpl(with(Hashable, Comparable, Iterable), flags(BASETYPE))]
impl PySet {
#[pyslot]
fn tp_new(cls: PyTypeRef, _args: FuncArgs, vm: &VirtualMachine) -> PyResult {
PySet::default().into_pyresult_with_type(vm, cls)
}
#[pymethod(magic)]
fn init(&self, iterable: OptionalArg<ArgIterable>, vm: &VirtualMachine) -> PyResult<()> {
if self.len() > 0 {
self.clear();
}
if let OptionalArg::Present(it) = iterable {
self.update(PosArgs::new(vec![it]), vm)?;
}
Ok(())
}
#[pymethod(magic)]
fn len(&self) -> usize {
self.inner.len()
}
#[pymethod(magic)]
fn sizeof(&self) -> usize {
std::mem::size_of::<Self>() + self.inner.sizeof()
}
#[pymethod]
fn copy(&self) -> Self {
Self {
inner: self.inner.copy(),
}
}
#[pymethod(magic)]
fn contains(&self, needle: PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.contains(&needle, vm)
}
#[pymethod]
fn union(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<Self> {
multi_args_set!(vm, others, self, union)
}
#[pymethod]
fn intersection(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<Self> {
multi_args_set!(vm, others, self, intersection)
}
#[pymethod]
fn difference(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<Self> {
multi_args_set!(vm, others, self, difference)
}
#[pymethod]
fn symmetric_difference(
&self,
others: PosArgs<ArgIterable>,
vm: &VirtualMachine,
) -> PyResult<Self> {
multi_args_set!(vm, others, self, symmetric_difference)
}
#[pymethod]
fn issubset(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.issubset(other, vm)
}
#[pymethod]
fn issuperset(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.issuperset(other, vm)
}
#[pymethod]
fn isdisjoint(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.isdisjoint(other, vm)
}
#[pymethod(name = "__ror__")]
#[pymethod(magic)]
fn or(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.union(other.iterable, vm)
}
#[pymethod(name = "__rand__")]
#[pymethod(magic)]
fn and(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.intersection(other.iterable, vm)
}
#[pymethod(magic)]
fn sub(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.difference(other.iterable, vm)
}
#[pymethod(magic)]
fn rsub(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.sub(other, vm)
}
#[pymethod(name = "__rxor__")]
#[pymethod(magic)]
fn xor(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.symmetric_difference(other.iterable, vm)
}
#[pymethod(magic)]
fn repr(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult {
let s = if zelf.inner.len() == 0 {
"set()".to_owned()
} else if let Some(_guard) = ReprGuard::enter(vm, zelf.as_object()) {
zelf.inner.repr(vm)?
} else {
"set(...)".to_owned()
};
Ok(vm.ctx.new_utf8_str(s))
}
#[pymethod]
pub fn add(&self, item: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
self.inner.add(item, vm)?;
Ok(())
}
#[pymethod]
fn remove(&self, item: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
self.inner.remove(item, vm)
}
#[pymethod]
fn discard(&self, item: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
self.inner.discard(&item, vm)?;
Ok(())
}
#[pymethod]
fn clear(&self) {
self.inner.clear()
}
#[pymethod]
fn pop(&self, vm: &VirtualMachine) -> PyResult {
self.inner.pop(vm)
}
#[pymethod(magic)]
fn ior(zelf: PyRef<Self>, iterable: SetIterable, vm: &VirtualMachine) -> PyResult {
zelf.inner.update(iterable.iterable, vm)?;
Ok(zelf.as_object().clone())
}
#[pymethod]
fn update(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<()> {
self.inner.update(others, vm)?;
Ok(())
}
#[pymethod]
fn intersection_update(
&self,
others: PosArgs<ArgIterable>,
vm: &VirtualMachine,
) -> PyResult<()> {
self.inner.intersection_update(others, vm)?;
Ok(())
}
#[pymethod(magic)]
fn iand(zelf: PyRef<Self>, iterable: SetIterable, vm: &VirtualMachine) -> PyResult {
zelf.inner.intersection_update(iterable.iterable, vm)?;
Ok(zelf.as_object().clone())
}
#[pymethod]
fn difference_update(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<()> {
self.inner.difference_update(others, vm)?;
Ok(())
}
#[pymethod(magic)]
fn isub(zelf: PyRef<Self>, iterable: SetIterable, vm: &VirtualMachine) -> PyResult {
zelf.inner.difference_update(iterable.iterable, vm)?;
Ok(zelf.as_object().clone())
}
#[pymethod]
fn symmetric_difference_update(
&self,
others: PosArgs<ArgIterable>,
vm: &VirtualMachine,
) -> PyResult<()> {
self.inner.symmetric_difference_update(others, vm)?;
Ok(())
}
#[pymethod(magic)]
fn ixor(zelf: PyRef<Self>, iterable: SetIterable, vm: &VirtualMachine) -> PyResult {
zelf.inner
.symmetric_difference_update(iterable.iterable, vm)?;
Ok(zelf.as_object().clone())
}
#[pymethod(magic)]
fn reduce(
zelf: PyRef<Self>,
vm: &VirtualMachine,
) -> PyResult<(PyTypeRef, PyObjectRef, Option<PyDictRef>)> {
reduce_set(&zelf.into_object(), vm)
}
}
impl Comparable for PySet {
fn cmp(
zelf: &PyRef<Self>,
other: &PyObjectRef,
op: PyComparisonOp,
vm: &VirtualMachine,
) -> PyResult<PyComparisonValue> {
extract_set(other).map_or(Ok(PyComparisonValue::NotImplemented), |other| {
Ok(zelf.inner.compare(other, op, vm)?.into())
})
}
}
impl Unhashable for PySet {}
impl Iterable for PySet {
fn iter(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult {
Ok(zelf.inner.iter().into_object(vm))
}
}
macro_rules! multi_args_frozenset {
($vm:expr, $others:expr, $zelf:expr, $op:tt) => {{
let mut res = $zelf.inner.copy();
for other in $others {
res = res.$op(other, $vm)?
}
Ok(Self { inner: res })
}};
}
impl SlotConstructor for PyFrozenSet {
type Args = OptionalArg<PyObjectRef>;
fn py_new(cls: PyTypeRef, iterable: Self::Args, vm: &VirtualMachine) -> PyResult {
let elements = if let OptionalArg::Present(iterable) = iterable {
let iterable = if cls.is(&vm.ctx.types.frozenset_type) {
match iterable.downcast_exact::<Self>(vm) {
Ok(fs) => return Ok(fs.into_object()),
Err(iterable) => iterable,
}
} else {
iterable
};
vm.extract_elements(&iterable)?
} else {
vec![]
};
// Return empty fs if iterable passed is empty and only for exact fs types.
if elements.is_empty() && cls.is(&vm.ctx.types.frozenset_type) {
Ok(vm.ctx.empty_frozenset.clone().into_object())
} else {
Self::from_iter(vm, elements).and_then(|o| o.into_pyresult_with_type(vm, cls))
}
}
}
#[pyimpl(flags(BASETYPE), with(Hashable, Comparable, Iterable, SlotConstructor))]
impl PyFrozenSet {
// Also used by ssl.rs windows.
pub(crate) fn from_iter(
vm: &VirtualMachine,
it: impl IntoIterator<Item = PyObjectRef>,
) -> PyResult<Self> {
let inner = PySetInner::default();
for elem in it {
inner.add(elem, vm)?;
}
Ok(Self { inner })
}
#[pymethod(magic)]
fn len(&self) -> usize {
self.inner.len()
}
#[pymethod(magic)]
fn sizeof(&self) -> usize {
std::mem::size_of::<Self>() + self.inner.sizeof()
}
#[pymethod]
fn copy(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyRef<Self> {
if zelf.class().is(&vm.ctx.types.frozenset_type) {
zelf
} else {
Self {
inner: zelf.inner.copy(),
}
.into_ref(vm)
}
}
#[pymethod(magic)]
fn contains(&self, needle: PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.contains(&needle, vm)
}
#[pymethod]
fn union(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<Self> {
multi_args_frozenset!(vm, others, self, union)
}
#[pymethod]
fn intersection(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<Self> {
multi_args_frozenset!(vm, others, self, intersection)
}
#[pymethod]
fn difference(&self, others: PosArgs<ArgIterable>, vm: &VirtualMachine) -> PyResult<Self> {
multi_args_frozenset!(vm, others, self, difference)
}
#[pymethod]
fn symmetric_difference(
&self,
others: PosArgs<ArgIterable>,
vm: &VirtualMachine,
) -> PyResult<Self> {
multi_args_frozenset!(vm, others, self, symmetric_difference)
}
#[pymethod]
fn issubset(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.issubset(other, vm)
}
#[pymethod]
fn issuperset(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.issuperset(other, vm)
}
#[pymethod]
fn isdisjoint(&self, other: ArgIterable, vm: &VirtualMachine) -> PyResult<bool> {
self.inner.isdisjoint(other, vm)
}
#[pymethod(name = "__ror__")]
#[pymethod(magic)]
fn or(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.union(other.iterable, vm)
}
#[pymethod(name = "__rand__")]
#[pymethod(magic)]
fn and(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.intersection(other.iterable, vm)
}
#[pymethod(magic)]
fn sub(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.difference(other.iterable, vm)
}
#[pymethod(magic)]
fn rsub(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.sub(other, vm)
}
#[pymethod(name = "__rxor__")]
#[pymethod(magic)]
fn xor(&self, other: SetIterable, vm: &VirtualMachine) -> PyResult<Self> {
self.symmetric_difference(other.iterable, vm)
}
#[pymethod(magic)]
fn repr(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult {
let inner = &zelf.inner;
let s = if inner.len() == 0 {
"frozenset()".to_owned()
} else if let Some(_guard) = ReprGuard::enter(vm, zelf.as_object()) {
format!("frozenset({})", inner.repr(vm)?)
} else {
"frozenset(...)".to_owned()
};
Ok(vm.ctx.new_utf8_str(s))
}
#[pymethod(magic)]
fn reduce(
zelf: PyRef<Self>,
vm: &VirtualMachine,
) -> PyResult<(PyTypeRef, PyObjectRef, Option<PyDictRef>)> {
reduce_set(&zelf.into_object(), vm)
}
}
impl Hashable for PyFrozenSet {
fn hash(zelf: &PyRef<Self>, vm: &VirtualMachine) -> PyResult<PyHash> {
zelf.inner.hash(vm)
}
}
impl Comparable for PyFrozenSet {
fn cmp(
zelf: &PyRef<Self>,
other: &PyObjectRef,
op: PyComparisonOp,
vm: &VirtualMachine,
) -> PyResult<PyComparisonValue> {
extract_set(other).map_or(Ok(PyComparisonValue::NotImplemented), |other| {
Ok(zelf.inner.compare(other, op, vm)?.into())
})
}
}
impl Iterable for PyFrozenSet {
fn iter(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult {
Ok(zelf.inner.iter().into_object(vm))
}
}
struct SetIterable {
iterable: PosArgs<ArgIterable>,
}
impl TryFromObject for SetIterable {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let class = obj.class();
if class.issubclass(&vm.ctx.types.set_type)
|| class.issubclass(&vm.ctx.types.frozenset_type)
{
// the class lease needs to be drop to be able to return the object
drop(class);
Ok(SetIterable {
iterable: PosArgs::new(vec![ArgIterable::try_from_object(vm, obj)?]),
})
} else {
Err(vm.new_type_error(format!("{} is not a subtype of set or frozenset", class)))
}
}
}
#[pyclass(module = false, name = "set_iterator")]
pub(crate) struct PySetIterator {
dict: PyRc<SetContentType>,
size: DictSize,
position: AtomicCell<usize>,
status: AtomicCell<IterStatus>,
}
impl fmt::Debug for PySetIterator {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// TODO: implement more detailed, non-recursive Debug formatter
f.write_str("set_iterator")
}
}
impl PyValue for PySetIterator {
fn class(vm: &VirtualMachine) -> &PyTypeRef {
&vm.ctx.types.set_iterator_type
}
}
#[pyimpl(with(PyIter))]
impl PySetIterator {
#[pymethod(magic)]
fn length_hint(&self) -> usize {
if let IterStatus::Exhausted = self.status.load() {
0
} else {
self.dict.len_from_entry_index(self.position.load())
}
}
#[pymethod(magic)]
fn reduce(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult<(PyObjectRef, (PyObjectRef,))> {
Ok((
vm.get_attribute(vm.builtins.clone(), "iter")?,
(vm.ctx.new_list(match zelf.status.load() {
IterStatus::Exhausted => vec![],
IterStatus::Active => zelf
.dict
.keys()
.into_iter()
.skip(zelf.position.load())
.collect(),
}),),
))
}
}
impl IteratorIterable for PySetIterator {}
impl PyIter for PySetIterator {
fn next(zelf: &PyRef<Self>, vm: &VirtualMachine) -> PyResult {
match zelf.status.load() {
IterStatus::Exhausted => Err(vm.new_stop_iteration()),
IterStatus::Active => {
if zelf.dict.has_changed_size(&zelf.size) {
zelf.status.store(IterStatus::Exhausted);
return Err(
vm.new_runtime_error("set changed size during iteration".to_owned())
);
}
match zelf.dict.next_entry_atomic(&zelf.position) {
Some((key, _)) => Ok(key),
None => {
zelf.status.store(IterStatus::Exhausted);
Err(vm.new_stop_iteration())
}
}
}
}
}
}
pub fn init(context: &PyContext) {
PySet::extend_class(context, &context.types.set_type);
PyFrozenSet::extend_class(context, &context.types.frozenset_type);
PySetIterator::extend_class(context, &context.types.set_iterator_type);
}