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128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/HTML/Parser/ListOfActiveFormattingElements.h>
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namespace Web::HTML {
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static constexpr size_t NoahsArkCapacity = 3;
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ListOfActiveFormattingElements::~ListOfActiveFormattingElements() = default;
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void ListOfActiveFormattingElements::visit_edges(JS::Cell::Visitor& visitor)
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{
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for (auto& entry : m_entries)
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visitor.visit(entry.element);
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}
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void ListOfActiveFormattingElements::ensure_noahs_ark_clause(DOM::Element& element)
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{
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Vector<Entry> possible_matches;
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for (size_t i = m_entries.size(); i > 0;) {
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i--;
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auto& entry = m_entries[i];
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if (entry.is_marker())
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break;
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if (entry.element->local_name() == element.local_name()
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&& entry.element->namespace_uri() == element.namespace_uri()
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&& entry.element->attribute_list_size() == element.attribute_list_size())
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possible_matches.append(entry);
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}
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if (possible_matches.size() < NoahsArkCapacity)
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return;
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// FIXME: the attributes should be compared as they where created by the parser
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element.for_each_attribute([&](auto& name, auto& value) {
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possible_matches.remove_all_matching([&](auto& entry) {
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auto attr = entry.element->get_attribute(name);
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return !attr.has_value() || attr != value;
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});
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});
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if (possible_matches.size() < NoahsArkCapacity)
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return;
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remove(*possible_matches.last().element);
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}
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// https://html.spec.whatwg.org/multipage/parsing.html#push-onto-the-list-of-active-formatting-elements
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void ListOfActiveFormattingElements::add(DOM::Element& element)
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{
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// 1. If there are already three elements in the list of active formatting elements after the last marker, if any, or anywhere in the list if there are no markers,
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// that have the same tag name, namespace, and attributes as element, then remove the earliest such element from the list of active formatting elements.
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// For these purposes, the attributes must be compared as they were when the elements were created by the parser; two elements have the same attributes if all their parsed attributes
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// can be paired such that the two attributes in each pair have identical names, namespaces, and values (the order of the attributes does not matter).
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ensure_noahs_ark_clause(element);
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// 2. Add element to the list of active formatting elements.
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m_entries.append({ element });
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}
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void ListOfActiveFormattingElements::add_marker()
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{
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m_entries.append({ nullptr });
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}
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bool ListOfActiveFormattingElements::contains(DOM::Element const& element) const
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{
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for (auto& entry : m_entries) {
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if (entry.element.ptr() == &element)
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return true;
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}
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return false;
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}
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DOM::Element* ListOfActiveFormattingElements::last_element_with_tag_name_before_marker(FlyString const& tag_name)
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{
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for (ssize_t i = m_entries.size() - 1; i >= 0; --i) {
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auto& entry = m_entries[i];
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if (entry.is_marker())
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return nullptr;
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if (entry.element->local_name() == tag_name)
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return entry.element.ptr();
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}
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return nullptr;
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}
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void ListOfActiveFormattingElements::remove(DOM::Element& element)
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{
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m_entries.remove_first_matching([&](auto& entry) {
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return entry.element.ptr() == &element;
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});
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}
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void ListOfActiveFormattingElements::clear_up_to_the_last_marker()
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{
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while (!m_entries.is_empty()) {
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auto entry = m_entries.take_last();
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if (entry.is_marker())
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break;
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}
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}
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Optional<size_t> ListOfActiveFormattingElements::find_index(DOM::Element const& element) const
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{
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for (size_t i = 0; i < m_entries.size(); i++) {
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if (m_entries[i].element.ptr() == &element)
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return i;
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}
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return {};
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}
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void ListOfActiveFormattingElements::replace(DOM::Element& to_remove, DOM::Element& to_add)
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{
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for (size_t i = 0; i < m_entries.size(); i++) {
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if (m_entries[i].element.ptr() == &to_remove)
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m_entries[i].element = GC::make_root(to_add);
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}
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}
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void ListOfActiveFormattingElements::insert_at(size_t index, DOM::Element& element)
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{
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m_entries.insert(index, { element });
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}
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}
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