187 lines
6.9 KiB
C++
187 lines
6.9 KiB
C++
/*
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* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "PositionIterator.h"
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#include "Editing.h"
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#include "HTMLBodyElement.h"
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#include "HTMLElement.h"
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#include "HTMLHtmlElement.h"
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#include "HTMLNames.h"
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#include "RenderBlockFlow.h"
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#include "RenderFlexibleBox.h"
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#include "RenderGrid.h"
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#include "RenderText.h"
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namespace WebCore {
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using namespace HTMLNames;
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PositionIterator::operator Position() const
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{
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if (m_nodeAfterPositionInAnchor) {
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ASSERT(m_nodeAfterPositionInAnchor->parentNode() == m_anchorNode);
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// FIXME: This check is inadaquete because any ancestor could be ignored by editing
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if (positionBeforeOrAfterNodeIsCandidate(*m_anchorNode))
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return positionBeforeNode(m_anchorNode);
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return positionInParentBeforeNode(m_nodeAfterPositionInAnchor);
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}
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if (positionBeforeOrAfterNodeIsCandidate(*m_anchorNode))
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return atStartOfNode() ? positionBeforeNode(m_anchorNode) : positionAfterNode(m_anchorNode);
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if (m_anchorNode->hasChildNodes())
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return lastPositionInOrAfterNode(m_anchorNode);
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return makeDeprecatedLegacyPosition(m_anchorNode, m_offsetInAnchor);
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}
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void PositionIterator::increment()
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{
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if (!m_anchorNode)
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return;
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if (m_nodeAfterPositionInAnchor) {
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m_anchorNode = m_nodeAfterPositionInAnchor;
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m_nodeAfterPositionInAnchor = m_anchorNode->firstChild();
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m_offsetInAnchor = 0;
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return;
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}
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if (m_anchorNode->renderer() && !m_anchorNode->hasChildNodes() && m_offsetInAnchor < lastOffsetForEditing(*m_anchorNode))
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m_offsetInAnchor = Position::uncheckedNextOffset(m_anchorNode, m_offsetInAnchor);
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else {
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m_nodeAfterPositionInAnchor = m_anchorNode;
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m_anchorNode = m_nodeAfterPositionInAnchor->parentNode();
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m_nodeAfterPositionInAnchor = m_nodeAfterPositionInAnchor->nextSibling();
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m_offsetInAnchor = 0;
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}
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}
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void PositionIterator::decrement()
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{
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if (!m_anchorNode)
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return;
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if (m_nodeAfterPositionInAnchor) {
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m_anchorNode = m_nodeAfterPositionInAnchor->previousSibling();
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if (m_anchorNode) {
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m_nodeAfterPositionInAnchor = nullptr;
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m_offsetInAnchor = m_anchorNode->hasChildNodes() ? 0 : lastOffsetForEditing(*m_anchorNode);
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} else {
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m_nodeAfterPositionInAnchor = m_nodeAfterPositionInAnchor->parentNode();
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m_anchorNode = m_nodeAfterPositionInAnchor->parentNode();
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m_offsetInAnchor = 0;
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}
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return;
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}
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if (m_anchorNode->hasChildNodes()) {
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m_anchorNode = m_anchorNode->lastChild();
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m_offsetInAnchor = m_anchorNode->hasChildNodes()? 0: lastOffsetForEditing(*m_anchorNode);
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} else {
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if (m_offsetInAnchor && m_anchorNode->renderer())
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m_offsetInAnchor = Position::uncheckedPreviousOffset(m_anchorNode, m_offsetInAnchor);
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else {
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m_nodeAfterPositionInAnchor = m_anchorNode;
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m_anchorNode = m_anchorNode->parentNode();
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}
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}
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}
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bool PositionIterator::atStart() const
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{
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if (!m_anchorNode)
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return true;
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if (m_anchorNode->parentNode())
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return false;
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return (!m_anchorNode->hasChildNodes() && !m_offsetInAnchor) || (m_nodeAfterPositionInAnchor && !m_nodeAfterPositionInAnchor->previousSibling());
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}
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bool PositionIterator::atEnd() const
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{
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if (!m_anchorNode)
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return true;
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if (m_nodeAfterPositionInAnchor)
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return false;
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return !m_anchorNode->parentNode() && (m_anchorNode->hasChildNodes() || m_offsetInAnchor >= lastOffsetForEditing(*m_anchorNode));
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}
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bool PositionIterator::atStartOfNode() const
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{
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if (!m_anchorNode)
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return true;
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if (!m_nodeAfterPositionInAnchor)
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return !m_anchorNode->hasChildNodes() && !m_offsetInAnchor;
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return !m_nodeAfterPositionInAnchor->previousSibling();
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}
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bool PositionIterator::atEndOfNode() const
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{
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if (!m_anchorNode)
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return true;
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if (m_nodeAfterPositionInAnchor)
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return false;
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return m_anchorNode->hasChildNodes() || m_offsetInAnchor >= lastOffsetForEditing(*m_anchorNode);
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}
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// This function should be kept in sync with Position::isCandidate().
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bool PositionIterator::isCandidate() const
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{
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if (!m_anchorNode)
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return false;
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RenderObject* renderer = m_anchorNode->renderer();
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if (!renderer)
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return false;
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if (renderer->style().visibility() != Visibility::Visible)
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return false;
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if (renderer->isBR())
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return Position(*this).isCandidate();
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if (is<RenderText>(*renderer))
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return !Position::nodeIsUserSelectNone(m_anchorNode) && downcast<RenderText>(*renderer).containsCaretOffset(m_offsetInAnchor);
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if (positionBeforeOrAfterNodeIsCandidate(*m_anchorNode))
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return (atStartOfNode() || atEndOfNode()) && !Position::nodeIsUserSelectNone(m_anchorNode->parentNode());
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if (is<HTMLHtmlElement>(*m_anchorNode))
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return false;
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if (is<RenderBlockFlow>(*renderer) || is<RenderGrid>(*renderer) || is<RenderFlexibleBox>(*renderer)) {
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auto& block = downcast<RenderBlock>(*renderer);
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if (block.logicalHeight() || is<HTMLBodyElement>(*m_anchorNode) || m_anchorNode->isRootEditableElement()) {
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if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(block))
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return atStartOfNode() && !Position::nodeIsUserSelectNone(m_anchorNode);
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return m_anchorNode->hasEditableStyle() && !Position::nodeIsUserSelectNone(m_anchorNode) && Position(*this).atEditingBoundary();
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}
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return false;
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}
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return m_anchorNode->hasEditableStyle() && !Position::nodeIsUserSelectNone(m_anchorNode) && Position(*this).atEditingBoundary();
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}
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} // namespace WebCore
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