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.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2020-2022, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/Element.h>
+#include <LibWeb/Forward.h>
+
+namespace Web::HTML {
+
+class ListOfActiveFormattingElements {
+public:
+    ListOfActiveFormattingElements() = default;
+    ~ListOfActiveFormattingElements();
+
+    struct Entry {
+        bool is_marker() const { return !element; }
+
+        JS::GCPtr<DOM::Element> element;
+    };
+
+    bool is_empty() const { return m_entries.is_empty(); }
+    bool contains(const DOM::Element&) const;
+
+    void add(DOM::Element& element);
+    void add_marker();
+    void insert_at(size_t index, DOM::Element& element);
+
+    void replace(DOM::Element& to_remove, DOM::Element& to_add);
+
+    void remove(DOM::Element&);
+
+    Vector<Entry> const& entries() const { return m_entries; }
+    Vector<Entry>& entries() { return m_entries; }
+
+    DOM::Element* last_element_with_tag_name_before_marker(FlyString const& tag_name);
+
+    void clear_up_to_the_last_marker();
+
+    Optional<size_t> find_index(DOM::Element const&) const;
+
+    void visit_edges(JS::Cell::Visitor&);
+
+private:
+    Vector<Entry> m_entries;
+};
+
+}