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LibJS: Add the MapIterator built-in and the key/values/entries methods

While this implementation should be complete it is based on HashMap's
iterator, which currently follows bucket-order instead of the required
insertion order. This can be simply fixed by replacing the underlying
HashMap member in Map with an enhanced one that maintains a linked
list in insertion order.
This commit is contained in:
Idan Horowitz 2021-06-12 23:58:03 +03:00 committed by Linus Groh
parent 6c0d5163a1
commit 322c8a3995
12 changed files with 286 additions and 0 deletions

View file

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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/MapIterator.h>
namespace JS {
MapIterator* MapIterator::create(GlobalObject& global_object, Map& map, Object::PropertyKind iteration_kind)
{
return global_object.heap().allocate<MapIterator>(global_object, *global_object.map_iterator_prototype(), map, iteration_kind);
}
MapIterator::MapIterator(Object& prototype, Map& map, Object::PropertyKind iteration_kind)
: Object(prototype)
, m_map(map)
, m_iteration_kind(iteration_kind)
, m_iterator(map.entries().begin())
{
}
MapIterator::~MapIterator()
{
}
void MapIterator::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(&m_map);
}
}