Source/WebCore/dom/BoundaryPoint.h

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

#pragma once

#include "Node.h"

namespace WebCore {

struct BoundaryPoint {
    Ref<Node> container;
    unsigned offset { 0 };

    BoundaryPoint(Ref<Node>&&, unsigned);

    Document& document() const;
};

bool operator==(const BoundaryPoint&, const BoundaryPoint&);
bool operator!=(const BoundaryPoint&, const BoundaryPoint&);

WTF::TextStream& operator<<(WTF::TextStream&, const BoundaryPoint&);

template<TreeType = Tree> PartialOrdering treeOrder(const BoundaryPoint&, const BoundaryPoint&);

WEBCORE_EXPORT std::optional<BoundaryPoint> makeBoundaryPointBeforeNode(Node&);
WEBCORE_EXPORT std::optional<BoundaryPoint> makeBoundaryPointAfterNode(Node&);
BoundaryPoint makeBoundaryPointBeforeNodeContents(Node&);
BoundaryPoint makeBoundaryPointAfterNodeContents(Node&);

WEBCORE_EXPORT PartialOrdering treeOrderForTesting(TreeType, const BoundaryPoint&, const BoundaryPoint&);

inline BoundaryPoint::BoundaryPoint(Ref<Node>&& container, unsigned offset)
    : container(WTFMove(container))
    , offset(offset)
{
}

inline Document& BoundaryPoint::document() const
{
    return container->document();
}

inline bool operator==(const BoundaryPoint& a, const BoundaryPoint& b)
{
    return a.container.ptr() == b.container.ptr() && a.offset == b.offset;
}

inline BoundaryPoint makeBoundaryPointBeforeNodeContents(Node& node)
{
    return { node, 0 };
}

inline BoundaryPoint makeBoundaryPointAfterNodeContents(Node& node)
{
    return { node, node.length() };
}

}