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LibWeb: Maintain a mapping for fast lookup in getElementById()

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With this change we maintain a data structure that maps ids to
corresponding elements. This allows us to avoid tree traversal in
getElementById() in all cases except ones when lookup happens for
unconnected elements.
This commit is contained in:
Aliaksandr Kalenik 2025-03-25 17:30:52 +00:00 • committed by Andreas Kling
commit 8cae20af1b
Notes: github-actions[bot] 2025-03-26 08:37:18 +00:00
15 changed files with 157 additions and 51 deletions
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39
Libraries/LibWeb/DOM/ElementByIdMap.cpp Normal file
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/*
* Copyright (c) 2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/DOM/ElementByIdMap.h>
namespace Web::DOM {
void ElementByIdMap::add(FlyString const& element_id, Element& element)
{
auto& elements_with_id = m_map.ensure(element_id, [] { return Vector<WeakPtr<Element>> {}; });
// Remove all elements that were deallocated.
elements_with_id.remove_all_matching([](WeakPtr<Element>& element) {
return !element.has_value();
});
VERIFY(!elements_with_id.contains_slow(element));
elements_with_id.insert_before_matching(element, [&](auto& another_element) {
return element.is_before(*another_element);
});
}
void ElementByIdMap::remove(FlyString const& element_id, Element& element)
{
auto maybe_elements_with_id = m_map.get(element_id);
if (!maybe_elements_with_id.has_value())
return;
auto& elements_with_id = *maybe_elements_with_id;
elements_with_id.remove_all_matching([&](auto& another_element) {
if (!another_element.has_value())
return true;
return &element == another_element.ptr();
});
}
}