LibWeb: Rename directory LibHTML => LibWeb

Let's rename this to LibWeb since it aims to provide more parts of the
web platform than just HTML. :^)

Libraries/LibWeb/Layout/LayoutPosition.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/RefPtr.h>
+
+namespace Web {
+
+class LayoutNode;
+
+struct LayoutPosition {
+    bool operator>=(const LayoutPosition& other) const
+    {
+        if (layout_node == other.layout_node)
+            return index_in_node >= other.index_in_node;
+
+        // FIXME: Implement.
+        return true;
+    }
+
+    bool operator<=(const LayoutPosition& other) const
+    {
+        if (layout_node == other.layout_node)
+            return index_in_node <= other.index_in_node;
+
+        // FIXME: Implement.
+        return false;
+    }
+
+    RefPtr<LayoutNode> layout_node;
+    int index_in_node { 0 };
+};
+
+class LayoutRange {
+public:
+    LayoutRange() {}
+    LayoutRange(const LayoutPosition& start, const LayoutPosition& end)
+        : m_start(start)
+        , m_end(end)
+    {
+    }
+
+    bool is_valid() const { return m_start.layout_node && m_end.layout_node; }
+
+    void set(const LayoutPosition& start, const LayoutPosition& end)
+    {
+        m_start = start;
+        m_end = end;
+    }
+
+    void set_start(const LayoutPosition& start) { m_start = start; }
+    void set_end(const LayoutPosition& end) { m_end = end; }
+
+    const LayoutPosition& start() const { return m_start; }
+    const LayoutPosition& end() const { return m_end; }
+
+private:
+    LayoutPosition m_start;
+    LayoutPosition m_end;
+};
+
+}