RangeBoundaryPoint.h [plain text]
#pragma once
#include "Node.h"
#include "Position.h"
namespace WebCore {
class RangeBoundaryPoint {
public:
explicit RangeBoundaryPoint(Node* container);
explicit RangeBoundaryPoint(const RangeBoundaryPoint&);
const Position toPosition() const;
Node* container() const;
unsigned offset() const;
Node* childBefore() const;
void clear();
void set(Ref<Node>&& container, unsigned offset, Node* childBefore);
void setOffset(unsigned);
void setToBeforeChild(Node&);
void setToAfterChild(Node&);
void setToStartOfNode(Ref<Node>&&);
void setToEndOfNode(Ref<Node>&&);
void childBeforeWillBeRemoved();
void invalidateOffset() const;
void ensureOffsetIsValid() const;
private:
RefPtr<Node> m_containerNode;
mutable std::optional<unsigned> m_offsetInContainer { 0 };
RefPtr<Node> m_childBeforeBoundary;
};
inline RangeBoundaryPoint::RangeBoundaryPoint(Node* container)
: m_containerNode(container)
{
ASSERT(m_containerNode);
}
inline RangeBoundaryPoint::RangeBoundaryPoint(const RangeBoundaryPoint& other)
: m_containerNode(other.container())
, m_offsetInContainer(other.offset())
, m_childBeforeBoundary(other.childBefore())
{
}
inline Node* RangeBoundaryPoint::container() const
{
return m_containerNode.get();
}
inline Node* RangeBoundaryPoint::childBefore() const
{
return m_childBeforeBoundary.get();
}
inline void RangeBoundaryPoint::ensureOffsetIsValid() const
{
if (m_offsetInContainer)
return;
ASSERT(m_childBeforeBoundary);
m_offsetInContainer = m_childBeforeBoundary->computeNodeIndex() + 1;
}
inline const Position RangeBoundaryPoint::toPosition() const
{
ensureOffsetIsValid();
return createLegacyEditingPosition(m_containerNode.get(), m_offsetInContainer.value());
}
inline unsigned RangeBoundaryPoint::offset() const
{
ensureOffsetIsValid();
return m_offsetInContainer.value();
}
inline void RangeBoundaryPoint::clear()
{
m_containerNode = nullptr;
m_offsetInContainer = 0;
m_childBeforeBoundary = nullptr;
}
inline void RangeBoundaryPoint::set(Ref<Node>&& container, unsigned offset, Node* childBefore)
{
ASSERT(childBefore == (offset ? container->traverseToChildAt(offset - 1) : 0));
m_containerNode = WTFMove(container);
m_offsetInContainer = offset;
m_childBeforeBoundary = childBefore;
}
inline void RangeBoundaryPoint::setOffset(unsigned offset)
{
ASSERT(m_containerNode);
ASSERT(m_containerNode->offsetInCharacters());
ASSERT(m_offsetInContainer);
ASSERT(!m_childBeforeBoundary);
m_offsetInContainer = offset;
}
inline void RangeBoundaryPoint::setToBeforeChild(Node& child)
{
ASSERT(child.parentNode());
m_childBeforeBoundary = child.previousSibling();
m_containerNode = child.parentNode();
m_offsetInContainer = m_childBeforeBoundary ? std::nullopt : std::optional<unsigned>(0);
}
inline void RangeBoundaryPoint::setToAfterChild(Node& child)
{
ASSERT(child.parentNode());
m_childBeforeBoundary = &child;
m_containerNode = child.parentNode();
m_offsetInContainer = m_childBeforeBoundary ? std::nullopt : std::optional<unsigned>(0);
}
inline void RangeBoundaryPoint::setToStartOfNode(Ref<Node>&& container)
{
m_containerNode = WTFMove(container);
m_offsetInContainer = 0;
m_childBeforeBoundary = nullptr;
}
inline void RangeBoundaryPoint::setToEndOfNode(Ref<Node>&& container)
{
m_containerNode = WTFMove(container);
if (m_containerNode->offsetInCharacters()) {
m_offsetInContainer = m_containerNode->maxCharacterOffset();
m_childBeforeBoundary = nullptr;
} else {
m_childBeforeBoundary = m_containerNode->lastChild();
m_offsetInContainer = m_childBeforeBoundary ? std::nullopt : std::optional<unsigned>(0);
}
}
inline void RangeBoundaryPoint::childBeforeWillBeRemoved()
{
ASSERT(!m_offsetInContainer || m_offsetInContainer.value());
m_childBeforeBoundary = m_childBeforeBoundary->previousSibling();
if (!m_childBeforeBoundary)
m_offsetInContainer = 0;
else if (m_offsetInContainer && m_offsetInContainer.value() > 0)
--(m_offsetInContainer.value());
}
inline void RangeBoundaryPoint::invalidateOffset() const
{
m_offsetInContainer = std::nullopt;
}
inline bool operator==(const RangeBoundaryPoint& a, const RangeBoundaryPoint& b)
{
if (a.container() != b.container())
return false;
if (a.childBefore() || b.childBefore()) {
if (a.childBefore() != b.childBefore())
return false;
} else {
if (a.offset() != b.offset())
return false;
}
return true;
}
}