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use crate::{
builtins::{function::make_builtin_fn, iterable::create_iter_result_object, Array, JsValue},
object::{JsObject, ObjectData},
property::{PropertyDescriptor, PropertyNameKind},
symbol::WellKnownSymbols,
BoaProfiler, Context, JsResult,
};
use gc::{Finalize, Trace};
use super::ordered_map::MapLock;
#[derive(Debug, Clone, Finalize, Trace)]
pub struct MapIterator {
iterated_map: Option<JsObject>,
map_next_index: usize,
map_iteration_kind: PropertyNameKind,
lock: MapLock,
}
impl MapIterator {
pub(crate) const NAME: &'static str = "MapIterator";
pub(crate) fn create_map_iterator(
map: &JsValue,
kind: PropertyNameKind,
context: &mut Context,
) -> JsResult<JsValue> {
if let Some(map_obj) = map.as_object() {
if let Some(map) = map_obj.borrow_mut().as_map_mut() {
let lock = map.lock(map_obj.clone());
let iter = MapIterator {
iterated_map: Some(map_obj.clone()),
map_next_index: 0,
map_iteration_kind: kind,
lock,
};
let map_iterator = JsValue::new_object(context);
map_iterator.set_data(ObjectData::map_iterator(iter));
map_iterator
.as_object()
.expect("map iterator object")
.set_prototype_instance(context.iterator_prototypes().map_iterator().into());
return Ok(map_iterator);
}
}
context.throw_type_error("`this` is not a Map")
}
pub(crate) fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
let iterator_object = match this {
JsValue::Object(obj) if obj.borrow().is_map_iterator() => obj,
_ => return context.throw_type_error("`this` is not a MapIterator"),
};
let mut iterator_object = iterator_object.borrow_mut();
let map_iterator = iterator_object
.as_map_iterator_mut()
.expect("checked that obj was a map iterator");
let mut index = map_iterator.map_next_index;
let item_kind = map_iterator.map_iteration_kind;
if let Some(obj) = map_iterator.iterated_map.take() {
let map = obj.borrow();
let entries = map.as_map_ref().expect("iterator should only iterate maps");
let num_entries = entries.full_len();
while index < num_entries {
let e = entries.get_index(index);
index += 1;
map_iterator.map_next_index = index;
if let Some((key, value)) = e {
let item = match item_kind {
PropertyNameKind::Key => {
Ok(create_iter_result_object(key.clone(), false, context))
}
PropertyNameKind::Value => {
Ok(create_iter_result_object(value.clone(), false, context))
}
PropertyNameKind::KeyAndValue => {
let result = Array::create_array_from_list(
[key.clone(), value.clone()],
context,
);
Ok(create_iter_result_object(result.into(), false, context))
}
};
drop(map);
map_iterator.iterated_map = Some(obj);
return item;
}
}
}
Ok(create_iter_result_object(
JsValue::undefined(),
true,
context,
))
}
pub(crate) fn create_prototype(iterator_prototype: JsValue, context: &mut Context) -> JsObject {
let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
let map_iterator = context.construct_object();
make_builtin_fn(Self::next, "next", &map_iterator, 0, context);
map_iterator.set_prototype_instance(iterator_prototype);
let to_string_tag = WellKnownSymbols::to_string_tag();
let to_string_tag_property = PropertyDescriptor::builder()
.value("Map Iterator")
.writable(false)
.enumerable(false)
.configurable(true);
map_iterator.insert(to_string_tag, to_string_tag_property);
map_iterator
}
}