Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/HTML/Parser/ListOfActiveFormattingElements.cpp

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2020-2022, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/DOM/Element.h>
+#include <LibWeb/HTML/Parser/ListOfActiveFormattingElements.h>
+
+namespace Web::HTML {
+
+ListOfActiveFormattingElements::~ListOfActiveFormattingElements() = default;
+
+void ListOfActiveFormattingElements::visit_edges(JS::Cell::Visitor& visitor)
+{
+    for (auto& entry : m_entries)
+        visitor.visit(entry.element);
+}
+
+void ListOfActiveFormattingElements::add(DOM::Element& element)
+{
+    // FIXME: Implement the Noah's Ark clause https://html.spec.whatwg.org/multipage/parsing.html#push-onto-the-list-of-active-formatting-elements
+    m_entries.append({ element });
+}
+
+void ListOfActiveFormattingElements::add_marker()
+{
+    m_entries.append({ nullptr });
+}
+
+bool ListOfActiveFormattingElements::contains(const DOM::Element& element) const
+{
+    for (auto& entry : m_entries) {
+        if (entry.element.ptr() == &element)
+            return true;
+    }
+    return false;
+}
+
+DOM::Element* ListOfActiveFormattingElements::last_element_with_tag_name_before_marker(FlyString const& tag_name)
+{
+    for (ssize_t i = m_entries.size() - 1; i >= 0; --i) {
+        auto& entry = m_entries[i];
+        if (entry.is_marker())
+            return nullptr;
+        if (entry.element->local_name() == tag_name)
+            return entry.element.ptr();
+    }
+    return nullptr;
+}
+
+void ListOfActiveFormattingElements::remove(DOM::Element& element)
+{
+    m_entries.remove_first_matching([&](auto& entry) {
+        return entry.element.ptr() == &element;
+    });
+}
+
+void ListOfActiveFormattingElements::clear_up_to_the_last_marker()
+{
+    while (!m_entries.is_empty()) {
+        auto entry = m_entries.take_last();
+        if (entry.is_marker())
+            break;
+    }
+}
+
+Optional<size_t> ListOfActiveFormattingElements::find_index(DOM::Element const& element) const
+{
+    for (size_t i = 0; i < m_entries.size(); i++) {
+        if (m_entries[i].element.ptr() == &element)
+            return i;
+    }
+    return {};
+}
+
+void ListOfActiveFormattingElements::replace(DOM::Element& to_remove, DOM::Element& to_add)
+{
+    for (size_t i = 0; i < m_entries.size(); i++) {
+        if (m_entries[i].element.ptr() == &to_remove)
+            m_entries[i].element = JS::make_handle(to_add);
+    }
+}
+
+void ListOfActiveFormattingElements::insert_at(size_t index, DOM::Element& element)
+{
+    m_entries.insert(index, { element });
+}
+
+}