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/*
* Copyright (C) 2007, 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.
*/
#include "config.h"
#include "PositionIterator.h"
#include "Editing.h"
#include "HTMLBodyElement.h"
#include "HTMLElement.h"
#include "HTMLHtmlElement.h"
#include "HTMLNames.h"
#include "RenderBlockFlow.h"
#include "RenderFlexibleBox.h"
#include "RenderGrid.h"
#include "RenderText.h"
namespace WebCore {
using namespace HTMLNames;
PositionIterator::operator Position() const
{
if (m_nodeAfterPositionInAnchor) {
ASSERT(m_nodeAfterPositionInAnchor->parentNode() == m_anchorNode);
// FIXME: This check is inadaquete because any ancestor could be ignored by editing
if (positionBeforeOrAfterNodeIsCandidate(*m_anchorNode))
return positionBeforeNode(m_anchorNode);
return positionInParentBeforeNode(m_nodeAfterPositionInAnchor);
}
if (positionBeforeOrAfterNodeIsCandidate(*m_anchorNode))
return atStartOfNode() ? positionBeforeNode(m_anchorNode) : positionAfterNode(m_anchorNode);
if (m_anchorNode->hasChildNodes())
return lastPositionInOrAfterNode(m_anchorNode);
return makeDeprecatedLegacyPosition(m_anchorNode, m_offsetInAnchor);
}
void PositionIterator::increment()
{
if (!m_anchorNode)
return;
if (m_nodeAfterPositionInAnchor) {
m_anchorNode = m_nodeAfterPositionInAnchor;
m_nodeAfterPositionInAnchor = m_anchorNode->firstChild();
m_offsetInAnchor = 0;
return;
}
if (m_anchorNode->renderer() && !m_anchorNode->hasChildNodes() && m_offsetInAnchor < lastOffsetForEditing(*m_anchorNode))
m_offsetInAnchor = Position::uncheckedNextOffset(m_anchorNode, m_offsetInAnchor);
else {
m_nodeAfterPositionInAnchor = m_anchorNode;
m_anchorNode = m_nodeAfterPositionInAnchor->parentNode();
m_nodeAfterPositionInAnchor = m_nodeAfterPositionInAnchor->nextSibling();
m_offsetInAnchor = 0;
}
}
void PositionIterator::decrement()
{
if (!m_anchorNode)
return;
if (m_nodeAfterPositionInAnchor) {
m_anchorNode = m_nodeAfterPositionInAnchor->previousSibling();
if (m_anchorNode) {
m_nodeAfterPositionInAnchor = nullptr;
m_offsetInAnchor = m_anchorNode->hasChildNodes() ? 0 : lastOffsetForEditing(*m_anchorNode);
} else {
m_nodeAfterPositionInAnchor = m_nodeAfterPositionInAnchor->parentNode();
m_anchorNode = m_nodeAfterPositionInAnchor->parentNode();
m_offsetInAnchor = 0;
}
return;
}
if (m_anchorNode->hasChildNodes()) {
m_anchorNode = m_anchorNode->lastChild();
m_offsetInAnchor = m_anchorNode->hasChildNodes()? 0: lastOffsetForEditing(*m_anchorNode);
} else {
if (m_offsetInAnchor && m_anchorNode->renderer())
m_offsetInAnchor = Position::uncheckedPreviousOffset(m_anchorNode, m_offsetInAnchor);
else {
m_nodeAfterPositionInAnchor = m_anchorNode;
m_anchorNode = m_anchorNode->parentNode();
}
}
}
bool PositionIterator::atStart() const
{
if (!m_anchorNode)
return true;
if (m_anchorNode->parentNode())
return false;
return (!m_anchorNode->hasChildNodes() && !m_offsetInAnchor) || (m_nodeAfterPositionInAnchor && !m_nodeAfterPositionInAnchor->previousSibling());
}
bool PositionIterator::atEnd() const
{
if (!m_anchorNode)
return true;
if (m_nodeAfterPositionInAnchor)
return false;
return !m_anchorNode->parentNode() && (m_anchorNode->hasChildNodes() || m_offsetInAnchor >= lastOffsetForEditing(*m_anchorNode));
}
bool PositionIterator::atStartOfNode() const
{
if (!m_anchorNode)
return true;
if (!m_nodeAfterPositionInAnchor)
return !m_anchorNode->hasChildNodes() && !m_offsetInAnchor;
return !m_nodeAfterPositionInAnchor->previousSibling();
}
bool PositionIterator::atEndOfNode() const
{
if (!m_anchorNode)
return true;
if (m_nodeAfterPositionInAnchor)
return false;
return m_anchorNode->hasChildNodes() || m_offsetInAnchor >= lastOffsetForEditing(*m_anchorNode);
}
// This function should be kept in sync with Position::isCandidate().
bool PositionIterator::isCandidate() const
{
if (!m_anchorNode)
return false;
RenderObject* renderer = m_anchorNode->renderer();
if (!renderer)
return false;
if (renderer->style().visibility() != Visibility::Visible)
return false;
if (renderer->isBR())
return Position(*this).isCandidate();
if (is<RenderText>(*renderer))
return !Position::nodeIsUserSelectNone(m_anchorNode) && downcast<RenderText>(*renderer).containsCaretOffset(m_offsetInAnchor);
if (positionBeforeOrAfterNodeIsCandidate(*m_anchorNode))
return (atStartOfNode() || atEndOfNode()) && !Position::nodeIsUserSelectNone(m_anchorNode->parentNode());
if (is<HTMLHtmlElement>(*m_anchorNode))
return false;
if (is<RenderBlockFlow>(*renderer) || is<RenderGrid>(*renderer) || is<RenderFlexibleBox>(*renderer)) {
auto& block = downcast<RenderBlock>(*renderer);
if (block.logicalHeight() || is<HTMLBodyElement>(*m_anchorNode) || m_anchorNode->isRootEditableElement()) {
if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(block))
return atStartOfNode() && !Position::nodeIsUserSelectNone(m_anchorNode);
return m_anchorNode->hasEditableStyle() && !Position::nodeIsUserSelectNone(m_anchorNode) && Position(*this).atEditingBoundary();
}
return false;
}
return m_anchorNode->hasEditableStyle() && !Position::nodeIsUserSelectNone(m_anchorNode) && Position(*this).atEditingBoundary();
}
} // namespace WebCore