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/*
* Copyright (C) 2008 Apple Inc. 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 APPLE INC. ``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
* 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.
*/
#ifndef RangeBoundaryPoint_h
#define RangeBoundaryPoint_h
#include "Node.h"
#include "Position.h"
namespace WebCore {
class RangeBoundaryPoint {
public:
RangeBoundaryPoint();
explicit RangeBoundaryPoint(PassRefPtr<Node> container);
const Position& position() const;
Node* container() const;
int offset() const;
Node* childBefore() const;
void clear();
void set(PassRefPtr<Node> container, int offset, Node* childBefore);
void setOffset(int offset);
void setToChild(Node* child);
void setToStart(PassRefPtr<Node> container);
void setToEnd(PassRefPtr<Node> container);
void childBeforeWillBeRemoved();
void invalidateOffset() const;
private:
static const int invalidOffset = -1;
mutable Position m_position;
Node* m_childBefore;
};
inline RangeBoundaryPoint::RangeBoundaryPoint()
: m_childBefore(0)
{
}
inline RangeBoundaryPoint::RangeBoundaryPoint(PassRefPtr<Node> container)
: m_position(container, 0)
, m_childBefore(0)
{
}
inline Node* RangeBoundaryPoint::container() const
{
return m_position.container.get();
}
inline Node* RangeBoundaryPoint::childBefore() const
{
return m_childBefore;
}
inline const Position& RangeBoundaryPoint::position() const
{
if (m_position.posOffset >= 0)
return m_position;
ASSERT(m_childBefore);
m_position.posOffset = m_childBefore->nodeIndex() + 1;
return m_position;
}
inline int RangeBoundaryPoint::offset() const
{
return position().posOffset;
}
inline void RangeBoundaryPoint::clear()
{
m_position.clear();
m_childBefore = 0;
}
inline void RangeBoundaryPoint::set(PassRefPtr<Node> container, int offset, Node* childBefore)
{
ASSERT(offset >= 0);
ASSERT(childBefore == (offset ? container->childNode(offset - 1) : 0));
m_position.container = container;
m_position.posOffset = offset;
m_childBefore = childBefore;
}
inline void RangeBoundaryPoint::setOffset(int offset)
{
ASSERT(m_position.container);
ASSERT(m_position.container->offsetInCharacters());
ASSERT(m_position.posOffset >= 0);
ASSERT(!m_childBefore);
m_position.posOffset = offset;
}
inline void RangeBoundaryPoint::setToChild(Node* child)
{
ASSERT(child);
ASSERT(child->parentNode());
m_position.container = child->parentNode();
m_childBefore = child->previousSibling();
m_position.posOffset = m_childBefore ? invalidOffset : 0;
}
inline void RangeBoundaryPoint::setToStart(PassRefPtr<Node> container)
{
ASSERT(container);
m_position.container = container;
m_position.posOffset = 0;
m_childBefore = 0;
}
inline void RangeBoundaryPoint::setToEnd(PassRefPtr<Node> container)
{
ASSERT(container);
m_position.container = container;
if (m_position.container->offsetInCharacters()) {
m_position.posOffset = m_position.container->maxCharacterOffset();
m_childBefore = 0;
} else {
m_childBefore = m_position.container->lastChild();
m_position.posOffset = m_childBefore ? invalidOffset : 0;
}
}
inline void RangeBoundaryPoint::childBeforeWillBeRemoved()
{
ASSERT(m_position.posOffset);
m_childBefore = m_childBefore->previousSibling();
if (!m_childBefore)
m_position.posOffset = 0;
else if (m_position.posOffset > 0)
--m_position.posOffset;
}
inline void RangeBoundaryPoint::invalidateOffset() const
{
m_position.posOffset = invalidOffset;
}
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;
}
}
#endif
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