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/*
* Copyright (C) 2005 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 "DeleteSelectionCommand.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DocumentMarkerController.h"
#include "EditingBoundary.h"
#include "Editor.h"
#include "EditorClient.h"
#include "Element.h"
#include "Frame.h"
#include "htmlediting.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "NodeTraversal.h"
#include "RenderTableCell.h"
#include "Text.h"
#include "VisibleUnits.h"
namespace WebCore {
using namespace HTMLNames;
static bool isTableRow(const Node* node)
{
return node && node->hasTagName(trTag);
}
static bool isTableCellEmpty(Node* cell)
{
ASSERT(isTableCell(cell));
return VisiblePosition(firstPositionInNode(cell)) == VisiblePosition(lastPositionInNode(cell));
}
static bool isTableRowEmpty(Node* row)
{
if (!isTableRow(row))
return false;
for (Node* child = row->firstChild(); child; child = child->nextSibling())
if (isTableCell(child) && !isTableCellEmpty(child))
return false;
return true;
}
DeleteSelectionCommand::DeleteSelectionCommand(Document *document, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup)
: CompositeEditCommand(document)
, m_hasSelectionToDelete(false)
, m_smartDelete(smartDelete)
, m_mergeBlocksAfterDelete(mergeBlocksAfterDelete)
, m_needPlaceholder(false)
, m_replace(replace)
, m_expandForSpecialElements(expandForSpecialElements)
, m_pruneStartBlockIfNecessary(false)
, m_startsAtEmptyLine(false)
, m_sanitizeMarkup(sanitizeMarkup)
, m_startBlock(0)
, m_endBlock(0)
, m_typingStyle(0)
, m_deleteIntoBlockquoteStyle(0)
{
}
DeleteSelectionCommand::DeleteSelectionCommand(const VisibleSelection& selection, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup)
: CompositeEditCommand(selection.start().anchorNode()->document())
, m_hasSelectionToDelete(true)
, m_smartDelete(smartDelete)
, m_mergeBlocksAfterDelete(mergeBlocksAfterDelete)
, m_needPlaceholder(false)
, m_replace(replace)
, m_expandForSpecialElements(expandForSpecialElements)
, m_pruneStartBlockIfNecessary(false)
, m_startsAtEmptyLine(false)
, m_sanitizeMarkup(sanitizeMarkup)
, m_selectionToDelete(selection)
, m_startBlock(0)
, m_endBlock(0)
, m_typingStyle(0)
, m_deleteIntoBlockquoteStyle(0)
{
}
void DeleteSelectionCommand::initializeStartEnd(Position& start, Position& end)
{
Node* startSpecialContainer = 0;
Node* endSpecialContainer = 0;
start = m_selectionToDelete.start();
end = m_selectionToDelete.end();
// For HRs, we'll get a position at (HR,1) when hitting delete from the beginning of the previous line, or (HR,0) when forward deleting,
// but in these cases, we want to delete it, so manually expand the selection
if (start.deprecatedNode()->hasTagName(hrTag))
start = positionBeforeNode(start.deprecatedNode());
else if (end.deprecatedNode()->hasTagName(hrTag))
end = positionAfterNode(end.deprecatedNode());
// FIXME: This is only used so that moveParagraphs can avoid the bugs in special element expansion.
if (!m_expandForSpecialElements)
return;
while (1) {
startSpecialContainer = 0;
endSpecialContainer = 0;
Position s = positionBeforeContainingSpecialElement(start, &startSpecialContainer);
Position e = positionAfterContainingSpecialElement(end, &endSpecialContainer);
if (!startSpecialContainer && !endSpecialContainer)
break;
if (VisiblePosition(start) != m_selectionToDelete.visibleStart() || VisiblePosition(end) != m_selectionToDelete.visibleEnd())
break;
// If we're going to expand to include the startSpecialContainer, it must be fully selected.
if (startSpecialContainer && !endSpecialContainer && comparePositions(positionInParentAfterNode(startSpecialContainer), end) > -1)
break;
// If we're going to expand to include the endSpecialContainer, it must be fully selected.
if (endSpecialContainer && !startSpecialContainer && comparePositions(start, positionInParentBeforeNode(endSpecialContainer)) > -1)
break;
if (startSpecialContainer && startSpecialContainer->isDescendantOf(endSpecialContainer))
// Don't adjust the end yet, it is the end of a special element that contains the start
// special element (which may or may not be fully selected).
start = s;
else if (endSpecialContainer && endSpecialContainer->isDescendantOf(startSpecialContainer))
// Don't adjust the start yet, it is the start of a special element that contains the end
// special element (which may or may not be fully selected).
end = e;
else {
start = s;
end = e;
}
}
}
void DeleteSelectionCommand::setStartingSelectionOnSmartDelete(const Position& start, const Position& end)
{
VisiblePosition newBase;
VisiblePosition newExtent;
if (startingSelection().isBaseFirst()) {
newBase = start;
newExtent = end;
} else {
newBase = end;
newExtent = start;
}
setStartingSelection(VisibleSelection(newBase, newExtent, startingSelection().isDirectional()));
}
void DeleteSelectionCommand::initializePositionData()
{
Position start, end;
initializeStartEnd(start, end);
m_upstreamStart = start.upstream();
m_downstreamStart = start.downstream();
m_upstreamEnd = end.upstream();
m_downstreamEnd = end.downstream();
m_startRoot = editableRootForPosition(start);
m_endRoot = editableRootForPosition(end);
m_startTableRow = enclosingNodeOfType(start, &isTableRow);
m_endTableRow = enclosingNodeOfType(end, &isTableRow);
// Don't move content out of a table cell.
// If the cell is non-editable, enclosingNodeOfType won't return it by default, so
// tell that function that we don't care if it returns non-editable nodes.
Node* startCell = enclosingNodeOfType(m_upstreamStart, &isTableCell, CanCrossEditingBoundary);
Node* endCell = enclosingNodeOfType(m_downstreamEnd, &isTableCell, CanCrossEditingBoundary);
// FIXME: This isn't right. A borderless table with two rows and a single column would appear as two paragraphs.
if (endCell && endCell != startCell)
m_mergeBlocksAfterDelete = false;
// Usually the start and the end of the selection to delete are pulled together as a result of the deletion.
// Sometimes they aren't (like when no merge is requested), so we must choose one position to hold the caret
// and receive the placeholder after deletion.
VisiblePosition visibleEnd(m_downstreamEnd);
if (m_mergeBlocksAfterDelete && !isEndOfParagraph(visibleEnd))
m_endingPosition = m_downstreamEnd;
else
m_endingPosition = m_downstreamStart;
// We don't want to merge into a block if it will mean changing the quote level of content after deleting
// selections that contain a whole number paragraphs plus a line break, since it is unclear to most users
// that such a selection actually ends at the start of the next paragraph. This matches TextEdit behavior
// for indented paragraphs.
// Only apply this rule if the endingSelection is a range selection. If it is a caret, then other operations have created
// the selection we're deleting (like the process of creating a selection to delete during a backspace), and the user isn't in the situation described above.
if (numEnclosingMailBlockquotes(start) != numEnclosingMailBlockquotes(end)
&& isStartOfParagraph(visibleEnd) && isStartOfParagraph(VisiblePosition(start))
&& endingSelection().isRange()) {
m_mergeBlocksAfterDelete = false;
m_pruneStartBlockIfNecessary = true;
}
// Handle leading and trailing whitespace, as well as smart delete adjustments to the selection
m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity());
m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY);
if (m_smartDelete) {
// skip smart delete if the selection to delete already starts or ends with whitespace
Position pos = VisiblePosition(m_upstreamStart, m_selectionToDelete.affinity()).deepEquivalent();
bool skipSmartDelete = pos.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull();
if (!skipSmartDelete)
skipSmartDelete = m_downstreamEnd.leadingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull();
// extend selection upstream if there is whitespace there
bool hasLeadingWhitespaceBeforeAdjustment = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity(), true).isNotNull();
if (!skipSmartDelete && hasLeadingWhitespaceBeforeAdjustment) {
VisiblePosition visiblePos = VisiblePosition(m_upstreamStart, VP_DEFAULT_AFFINITY).previous();
pos = visiblePos.deepEquivalent();
// Expand out one character upstream for smart delete and recalculate
// positions based on this change.
m_upstreamStart = pos.upstream();
m_downstreamStart = pos.downstream();
m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(visiblePos.affinity());
setStartingSelectionOnSmartDelete(m_upstreamStart, m_upstreamEnd);
}
// trailing whitespace is only considered for smart delete if there is no leading
// whitespace, as in the case where you double-click the first word of a paragraph.
if (!skipSmartDelete && !hasLeadingWhitespaceBeforeAdjustment && m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull()) {
// Expand out one character downstream for smart delete and recalculate
// positions based on this change.
pos = VisiblePosition(m_downstreamEnd, VP_DEFAULT_AFFINITY).next().deepEquivalent();
m_upstreamEnd = pos.upstream();
m_downstreamEnd = pos.downstream();
m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY);
setStartingSelectionOnSmartDelete(m_downstreamStart, m_downstreamEnd);
}
}
// We must pass call parentAnchoredEquivalent on the positions since some editing positions
// that appear inside their nodes aren't really inside them. [hr, 0] is one example.
// FIXME: parentAnchoredEquivalent should eventually be moved into enclosing element getters
// like the one below, since editing functions should obviously accept editing positions.
// FIXME: Passing false to enclosingNodeOfType tells it that it's OK to return a non-editable
// node. This was done to match existing behavior, but it seems wrong.
m_startBlock = enclosingNodeOfType(m_downstreamStart.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary);
m_endBlock = enclosingNodeOfType(m_upstreamEnd.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary);
}
void DeleteSelectionCommand::saveTypingStyleState()
{
// A common case is deleting characters that are all from the same text node. In
// that case, the style at the start of the selection before deletion will be the
// same as the style at the start of the selection after deletion (since those
// two positions will be identical). Therefore there is no need to save the
// typing style at the start of the selection, nor is there a reason to
// compute the style at the start of the selection after deletion (see the
// early return in calculateTypingStyleAfterDelete).
if (m_upstreamStart.deprecatedNode() == m_downstreamEnd.deprecatedNode() && m_upstreamStart.deprecatedNode()->isTextNode())
return;
// Figure out the typing style in effect before the delete is done.
m_typingStyle = EditingStyle::create(m_selectionToDelete.start());
m_typingStyle->removeStyleAddedByNode(enclosingAnchorElement(m_selectionToDelete.start()));
// If we're deleting into a Mail blockquote, save the style at end() instead of start()
// We'll use this later in computeTypingStyleAfterDelete if we end up outside of a Mail blockquote
if (enclosingNodeOfType(m_selectionToDelete.start(), isMailBlockquote))
m_deleteIntoBlockquoteStyle = EditingStyle::create(m_selectionToDelete.end());
else
m_deleteIntoBlockquoteStyle = 0;
}
bool DeleteSelectionCommand::handleSpecialCaseBRDelete()
{
Node* nodeAfterUpstreamStart = m_upstreamStart.computeNodeAfterPosition();
Node* nodeAfterDownstreamStart = m_downstreamStart.computeNodeAfterPosition();
// Upstream end will appear before BR due to canonicalization
Node* nodeAfterUpstreamEnd = m_upstreamEnd.computeNodeAfterPosition();
if (!nodeAfterUpstreamStart || !nodeAfterDownstreamStart)
return false;
// Check for special-case where the selection contains only a BR on a line by itself after another BR.
bool upstreamStartIsBR = nodeAfterUpstreamStart->hasTagName(brTag);
bool downstreamStartIsBR = nodeAfterDownstreamStart->hasTagName(brTag);
bool isBROnLineByItself = upstreamStartIsBR && downstreamStartIsBR && nodeAfterDownstreamStart == nodeAfterUpstreamEnd;
if (isBROnLineByItself) {
removeNode(nodeAfterDownstreamStart);
return true;
}
// FIXME: This code doesn't belong in here.
// We detect the case where the start is an empty line consisting of BR not wrapped in a block element.
if (upstreamStartIsBR && downstreamStartIsBR && !(isStartOfBlock(positionBeforeNode(nodeAfterUpstreamStart)) && isEndOfBlock(positionAfterNode(nodeAfterUpstreamStart)))) {
m_startsAtEmptyLine = true;
m_endingPosition = m_downstreamEnd;
}
return false;
}
static Position firstEditablePositionInNode(Node* node)
{
ASSERT(node);
Node* next = node;
while (next && !next->rendererIsEditable())
next = NodeTraversal::next(next, node);
return next ? firstPositionInOrBeforeNode(next) : Position();
}
void DeleteSelectionCommand::removeNode(PassRefPtr<Node> node, ShouldAssumeContentIsAlwaysEditable shouldAssumeContentIsAlwaysEditable)
{
if (!node)
return;
if (m_startRoot != m_endRoot && !(node->isDescendantOf(m_startRoot.get()) && node->isDescendantOf(m_endRoot.get()))) {
// If a node is not in both the start and end editable roots, remove it only if its inside an editable region.
if (!node->parentNode()->rendererIsEditable()) {
// Don't remove non-editable atomic nodes.
if (!node->firstChild())
return;
// Search this non-editable region for editable regions to empty.
RefPtr<Node> child = node->firstChild();
while (child) {
RefPtr<Node> nextChild = child->nextSibling();
removeNode(child.get(), shouldAssumeContentIsAlwaysEditable);
// Bail if nextChild is no longer node's child.
if (nextChild && nextChild->parentNode() != node)
return;
child = nextChild;
}
// Don't remove editable regions that are inside non-editable ones, just clear them.
return;
}
}
if (isTableStructureNode(node.get()) || node->isRootEditableElement()) {
// Do not remove an element of table structure; remove its contents.
// Likewise for the root editable element.
Node* child = node->firstChild();
while (child) {
Node* remove = child;
child = child->nextSibling();
removeNode(remove, shouldAssumeContentIsAlwaysEditable);
}
// Make sure empty cell has some height, if a placeholder can be inserted.
document()->updateLayoutIgnorePendingStylesheets();
RenderObject *r = node->renderer();
if (r && r->isTableCell() && toRenderTableCell(r)->contentHeight() <= 0) {
Position firstEditablePosition = firstEditablePositionInNode(node.get());
if (firstEditablePosition.isNotNull())
insertBlockPlaceholder(firstEditablePosition);
}
return;
}
if (node == m_startBlock && !isEndOfBlock(VisiblePosition(firstPositionInNode(m_startBlock.get())).previous()))
m_needPlaceholder = true;
else if (node == m_endBlock && !isStartOfBlock(VisiblePosition(lastPositionInNode(m_startBlock.get())).next()))
m_needPlaceholder = true;
// FIXME: Update the endpoints of the range being deleted.
updatePositionForNodeRemoval(m_endingPosition, node.get());
updatePositionForNodeRemoval(m_leadingWhitespace, node.get());
updatePositionForNodeRemoval(m_trailingWhitespace, node.get());
CompositeEditCommand::removeNode(node, shouldAssumeContentIsAlwaysEditable);
}
static void updatePositionForTextRemoval(Node* node, int offset, int count, Position& position)
{
if (position.anchorType() != Position::PositionIsOffsetInAnchor || position.containerNode() != node)
return;
if (position.offsetInContainerNode() > offset + count)
position.moveToOffset(position.offsetInContainerNode() - count);
else if (position.offsetInContainerNode() > offset)
position.moveToOffset(offset);
}
void DeleteSelectionCommand::deleteTextFromNode(PassRefPtr<Text> node, unsigned offset, unsigned count)
{
// FIXME: Update the endpoints of the range being deleted.
updatePositionForTextRemoval(node.get(), offset, count, m_endingPosition);
updatePositionForTextRemoval(node.get(), offset, count, m_leadingWhitespace);
updatePositionForTextRemoval(node.get(), offset, count, m_trailingWhitespace);
updatePositionForTextRemoval(node.get(), offset, count, m_downstreamEnd);
CompositeEditCommand::deleteTextFromNode(node, offset, count);
}
void DeleteSelectionCommand::makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss()
{
RefPtr<Range> range = m_selectionToDelete.toNormalizedRange();
RefPtr<Node> node = range->firstNode();
while (node && node != range->pastLastNode()) {
RefPtr<Node> nextNode = NodeTraversal::next(node.get());
if ((node->hasTagName(styleTag) && !(toElement(node.get())->hasAttribute(scopedAttr))) || node->hasTagName(linkTag)) {
nextNode = NodeTraversal::nextSkippingChildren(node.get());
RefPtr<ContainerNode> rootEditableElement = node->rootEditableElement();
removeNode(node);
appendNode(node, rootEditableElement);
}
node = nextNode;
}
}
void DeleteSelectionCommand::handleGeneralDelete()
{
if (m_upstreamStart.isNull())
return;
int startOffset = m_upstreamStart.deprecatedEditingOffset();
Node* startNode = m_upstreamStart.deprecatedNode();
makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss();
// Never remove the start block unless it's a table, in which case we won't merge content in.
if (startNode == m_startBlock && startOffset == 0 && canHaveChildrenForEditing(startNode) && !startNode->hasTagName(tableTag)) {
startOffset = 0;
startNode = NodeTraversal::next(startNode);
if (!startNode)
return;
}
if (startOffset >= caretMaxOffset(startNode) && startNode->isTextNode()) {
Text* text = toText(startNode);
if (text->length() > (unsigned)caretMaxOffset(startNode))
deleteTextFromNode(text, caretMaxOffset(startNode), text->length() - caretMaxOffset(startNode));
}
if (startOffset >= lastOffsetForEditing(startNode)) {
startNode = NodeTraversal::nextSkippingChildren(startNode);
startOffset = 0;
}
// Done adjusting the start. See if we're all done.
if (!startNode)
return;
if (startNode == m_downstreamEnd.deprecatedNode()) {
if (m_downstreamEnd.deprecatedEditingOffset() - startOffset > 0) {
if (startNode->isTextNode()) {
// in a text node that needs to be trimmed
Text* text = toText(startNode);
deleteTextFromNode(text, startOffset, m_downstreamEnd.deprecatedEditingOffset() - startOffset);
} else {
removeChildrenInRange(startNode, startOffset, m_downstreamEnd.deprecatedEditingOffset());
m_endingPosition = m_upstreamStart;
}
}
// The selection to delete is all in one node.
if (!startNode->renderer() || (!startOffset && m_downstreamEnd.atLastEditingPositionForNode()))
removeNode(startNode);
}
else {
bool startNodeWasDescendantOfEndNode = m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode());
// The selection to delete spans more than one node.
RefPtr<Node> node(startNode);
if (startOffset > 0) {
if (startNode->isTextNode()) {
// in a text node that needs to be trimmed
Text* text = toText(node.get());
deleteTextFromNode(text, startOffset, text->length() - startOffset);
node = NodeTraversal::next(node.get());
} else {
node = startNode->childNode(startOffset);
}
} else if (startNode == m_upstreamEnd.deprecatedNode() && startNode->isTextNode()) {
Text* text = toText(m_upstreamEnd.deprecatedNode());
deleteTextFromNode(text, 0, m_upstreamEnd.deprecatedEditingOffset());
}
// handle deleting all nodes that are completely selected
while (node && node != m_downstreamEnd.deprecatedNode()) {
if (comparePositions(firstPositionInOrBeforeNode(node.get()), m_downstreamEnd) >= 0) {
// NodeTraversal::nextSkippingChildren just blew past the end position, so stop deleting
node = 0;
} else if (!m_downstreamEnd.deprecatedNode()->isDescendantOf(node.get())) {
RefPtr<Node> nextNode = NodeTraversal::nextSkippingChildren(node.get());
// if we just removed a node from the end container, update end position so the
// check above will work
updatePositionForNodeRemoval(m_downstreamEnd, node.get());
removeNode(node.get());
node = nextNode.get();
} else {
Node* n = node->lastDescendant();
if (m_downstreamEnd.deprecatedNode() == n && m_downstreamEnd.deprecatedEditingOffset() >= caretMaxOffset(n)) {
removeNode(node.get());
node = 0;
} else
node = NodeTraversal::next(node.get());
}
}
if (m_downstreamEnd.deprecatedNode() != startNode && !m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode()) && m_downstreamEnd.anchorNode()->inDocument() && m_downstreamEnd.deprecatedEditingOffset() >= caretMinOffset(m_downstreamEnd.deprecatedNode())) {
if (m_downstreamEnd.atLastEditingPositionForNode() && !canHaveChildrenForEditing(m_downstreamEnd.deprecatedNode())) {
// The node itself is fully selected, not just its contents. Delete it.
removeNode(m_downstreamEnd.deprecatedNode());
} else {
if (m_downstreamEnd.deprecatedNode()->isTextNode()) {
// in a text node that needs to be trimmed
Text* text = toText(m_downstreamEnd.deprecatedNode());
if (m_downstreamEnd.deprecatedEditingOffset() > 0) {
deleteTextFromNode(text, 0, m_downstreamEnd.deprecatedEditingOffset());
}
// Remove children of m_downstreamEnd.deprecatedNode() that come after m_upstreamStart.
// Don't try to remove children if m_upstreamStart was inside m_downstreamEnd.deprecatedNode()
// and m_upstreamStart has been removed from the document, because then we don't
// know how many children to remove.
// FIXME: Make m_upstreamStart a position we update as we remove content, then we can
// always know which children to remove.
} else if (!(startNodeWasDescendantOfEndNode && !m_upstreamStart.anchorNode()->inDocument())) {
int offset = 0;
if (m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode())) {
Node* n = m_upstreamStart.deprecatedNode();
while (n && n->parentNode() != m_downstreamEnd.deprecatedNode())
n = n->parentNode();
if (n)
offset = n->nodeIndex() + 1;
}
removeChildrenInRange(m_downstreamEnd.deprecatedNode(), offset, m_downstreamEnd.deprecatedEditingOffset());
m_downstreamEnd = createLegacyEditingPosition(m_downstreamEnd.deprecatedNode(), offset);
}
}
}
}
}
void DeleteSelectionCommand::fixupWhitespace()
{
document()->updateLayoutIgnorePendingStylesheets();
// FIXME: isRenderedCharacter should be removed, and we should use VisiblePosition::characterAfter and VisiblePosition::characterBefore
if (m_leadingWhitespace.isNotNull() && !m_leadingWhitespace.isRenderedCharacter() && m_leadingWhitespace.deprecatedNode()->isTextNode()) {
Text* textNode = toText(m_leadingWhitespace.deprecatedNode());
ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
replaceTextInNodePreservingMarkers(textNode, m_leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
}
if (m_trailingWhitespace.isNotNull() && !m_trailingWhitespace.isRenderedCharacter() && m_trailingWhitespace.deprecatedNode()->isTextNode()) {
Text* textNode = toText(m_trailingWhitespace.deprecatedNode());
ASSERT(!textNode->renderer() ||textNode->renderer()->style()->collapseWhiteSpace());
replaceTextInNodePreservingMarkers(textNode, m_trailingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
}
}
// If a selection starts in one block and ends in another, we have to merge to bring content before the
// start together with content after the end.
void DeleteSelectionCommand::mergeParagraphs()
{
if (!m_mergeBlocksAfterDelete) {
if (m_pruneStartBlockIfNecessary) {
// We aren't going to merge into the start block, so remove it if it's empty.
prune(m_startBlock);
// Removing the start block during a deletion is usually an indication that we need
// a placeholder, but not in this case.
m_needPlaceholder = false;
}
return;
}
// It shouldn't have been asked to both try and merge content into the start block and prune it.
ASSERT(!m_pruneStartBlockIfNecessary);
// FIXME: Deletion should adjust selection endpoints as it removes nodes so that we never get into this state (4099839).
if (!m_downstreamEnd.anchorNode()->inDocument() || !m_upstreamStart.anchorNode()->inDocument())
return;
// FIXME: The deletion algorithm shouldn't let this happen.
if (comparePositions(m_upstreamStart, m_downstreamEnd) > 0)
return;
// There's nothing to merge.
if (m_upstreamStart == m_downstreamEnd)
return;
VisiblePosition startOfParagraphToMove(m_downstreamEnd);
VisiblePosition mergeDestination(m_upstreamStart);
// m_downstreamEnd's block has been emptied out by deletion. There is no content inside of it to
// move, so just remove it.
Element* endBlock = enclosingBlock(m_downstreamEnd.deprecatedNode());
if (!endBlock || !endBlock->contains(startOfParagraphToMove.deepEquivalent().deprecatedNode()) || !startOfParagraphToMove.deepEquivalent().deprecatedNode()) {
removeNode(enclosingBlock(m_downstreamEnd.deprecatedNode()));
return;
}
// We need to merge into m_upstreamStart's block, but it's been emptied out and collapsed by deletion.
if (!mergeDestination.deepEquivalent().deprecatedNode() || !mergeDestination.deepEquivalent().deprecatedNode()->isDescendantOf(enclosingBlock(m_upstreamStart.containerNode())) || m_startsAtEmptyLine) {
insertNodeAt(createBreakElement(document()).get(), m_upstreamStart);
mergeDestination = VisiblePosition(m_upstreamStart);
}
if (mergeDestination == startOfParagraphToMove)
return;
VisiblePosition endOfParagraphToMove = endOfParagraph(startOfParagraphToMove);
if (mergeDestination == endOfParagraphToMove)
return;
// The rule for merging into an empty block is: only do so if its farther to the right.
// FIXME: Consider RTL.
if (!m_startsAtEmptyLine && isStartOfParagraph(mergeDestination) && startOfParagraphToMove.absoluteCaretBounds().x() > mergeDestination.absoluteCaretBounds().x()) {
if (mergeDestination.deepEquivalent().downstream().deprecatedNode()->hasTagName(brTag)) {
removeNodeAndPruneAncestors(mergeDestination.deepEquivalent().downstream().deprecatedNode());
m_endingPosition = startOfParagraphToMove.deepEquivalent();
return;
}
}
// Block images, tables and horizontal rules cannot be made inline with content at mergeDestination. If there is
// any (!isStartOfParagraph(mergeDestination)), don't merge, just move the caret to just before the selection we deleted.
// See https://bugs.webkit.org/show_bug.cgi?id=25439
if (isRenderedAsNonInlineTableImageOrHR(startOfParagraphToMove.deepEquivalent().deprecatedNode()) && !isStartOfParagraph(mergeDestination)) {
m_endingPosition = m_upstreamStart;
return;
}
RefPtr<Range> range = Range::create(document(), startOfParagraphToMove.deepEquivalent().parentAnchoredEquivalent(), endOfParagraphToMove.deepEquivalent().parentAnchoredEquivalent());
RefPtr<Range> rangeToBeReplaced = Range::create(document(), mergeDestination.deepEquivalent().parentAnchoredEquivalent(), mergeDestination.deepEquivalent().parentAnchoredEquivalent());
if (!document()->frame()->editor().client()->shouldMoveRangeAfterDelete(range.get(), rangeToBeReplaced.get()))
return;
// moveParagraphs will insert placeholders if it removes blocks that would require their use, don't let block
// removals that it does cause the insertion of *another* placeholder.
bool needPlaceholder = m_needPlaceholder;
bool paragraphToMergeIsEmpty = (startOfParagraphToMove == endOfParagraphToMove);
moveParagraph(startOfParagraphToMove, endOfParagraphToMove, mergeDestination, false, !paragraphToMergeIsEmpty);
m_needPlaceholder = needPlaceholder;
// The endingPosition was likely clobbered by the move, so recompute it (moveParagraph selects the moved paragraph).
m_endingPosition = endingSelection().start();
}
void DeleteSelectionCommand::removePreviouslySelectedEmptyTableRows()
{
if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow) {
Node* row = m_endTableRow->previousSibling();
while (row && row != m_startTableRow) {
RefPtr<Node> previousRow = row->previousSibling();
if (isTableRowEmpty(row))
// Use a raw removeNode, instead of DeleteSelectionCommand's, because
// that won't remove rows, it only empties them in preparation for this function.
CompositeEditCommand::removeNode(row);
row = previousRow.get();
}
}
// Remove empty rows after the start row.
if (m_startTableRow && m_startTableRow->inDocument() && m_startTableRow != m_endTableRow) {
Node* row = m_startTableRow->nextSibling();
while (row && row != m_endTableRow) {
RefPtr<Node> nextRow = row->nextSibling();
if (isTableRowEmpty(row))
CompositeEditCommand::removeNode(row);
row = nextRow.get();
}
}
if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow)
if (isTableRowEmpty(m_endTableRow.get())) {
// Don't remove m_endTableRow if it's where we're putting the ending selection.
if (!m_endingPosition.deprecatedNode()->isDescendantOf(m_endTableRow.get())) {
// FIXME: We probably shouldn't remove m_endTableRow unless it's fully selected, even if it is empty.
// We'll need to start adjusting the selection endpoints during deletion to know whether or not m_endTableRow
// was fully selected here.
CompositeEditCommand::removeNode(m_endTableRow.get());
}
}
}
void DeleteSelectionCommand::calculateTypingStyleAfterDelete()
{
if (!m_typingStyle)
return;
// Compute the difference between the style before the delete and the style now
// after the delete has been done. Set this style on the frame, so other editing
// commands being composed with this one will work, and also cache it on the command,
// so the Frame::appliedEditing can set it after the whole composite command
// has completed.
// If we deleted into a blockquote, but are now no longer in a blockquote, use the alternate typing style
if (m_deleteIntoBlockquoteStyle && !enclosingNodeOfType(m_endingPosition, isMailBlockquote, CanCrossEditingBoundary))
m_typingStyle = m_deleteIntoBlockquoteStyle;
m_deleteIntoBlockquoteStyle = 0;
m_typingStyle->prepareToApplyAt(m_endingPosition);
if (m_typingStyle->isEmpty())
m_typingStyle = 0;
// This is where we've deleted all traces of a style but not a whole paragraph (that's handled above).
// In this case if we start typing, the new characters should have the same style as the just deleted ones,
// but, if we change the selection, come back and start typing that style should be lost. Also see
// preserveTypingStyle() below.
document()->frame()->selection()->setTypingStyle(m_typingStyle);
}
void DeleteSelectionCommand::clearTransientState()
{
m_selectionToDelete = VisibleSelection();
m_upstreamStart.clear();
m_downstreamStart.clear();
m_upstreamEnd.clear();
m_downstreamEnd.clear();
m_endingPosition.clear();
m_leadingWhitespace.clear();
m_trailingWhitespace.clear();
}
String DeleteSelectionCommand::originalStringForAutocorrectionAtBeginningOfSelection()
{
if (!m_selectionToDelete.isRange())
return String();
VisiblePosition startOfSelection = m_selectionToDelete.start();
if (!isStartOfWord(startOfSelection))
return String();
VisiblePosition nextPosition = startOfSelection.next();
if (nextPosition.isNull())
return String();
RefPtr<Range> rangeOfFirstCharacter = Range::create(document(), startOfSelection.deepEquivalent(), nextPosition.deepEquivalent());
Vector<DocumentMarker*> markers = document()->markers()->markersInRange(rangeOfFirstCharacter.get(), DocumentMarker::Autocorrected);
for (size_t i = 0; i < markers.size(); ++i) {
const DocumentMarker* marker = markers[i];
int startOffset = marker->startOffset();
if (startOffset == startOfSelection.deepEquivalent().offsetInContainerNode())
return marker->description();
}
return String();
}
// This method removes div elements with no attributes that have only one child or no children at all.
void DeleteSelectionCommand::removeRedundantBlocks()
{
Node* node = m_endingPosition.containerNode();
Node* rootNode = node->rootEditableElement();
while (node != rootNode) {
if (isRemovableBlock(node)) {
if (node == m_endingPosition.anchorNode())
updatePositionForNodeRemovalPreservingChildren(m_endingPosition, node);
CompositeEditCommand::removeNodePreservingChildren(node);
node = m_endingPosition.anchorNode();
} else
node = node->parentNode();
}
}
void DeleteSelectionCommand::doApply()
{
// If selection has not been set to a custom selection when the command was created,
// use the current ending selection.
if (!m_hasSelectionToDelete)
m_selectionToDelete = endingSelection();
if (!m_selectionToDelete.isNonOrphanedRange())
return;
String originalString = originalStringForAutocorrectionAtBeginningOfSelection();
// If the deletion is occurring in a text field, and we're not deleting to replace the selection, then let the frame call across the bridge to notify the form delegate.
if (!m_replace) {
Element* textControl = enclosingTextFormControl(m_selectionToDelete.start());
if (textControl && textControl->focused())
document()->frame()->editor().textWillBeDeletedInTextField(textControl);
}
// save this to later make the selection with
EAffinity affinity = m_selectionToDelete.affinity();
Position downstreamEnd = m_selectionToDelete.end().downstream();
m_needPlaceholder = isStartOfParagraph(m_selectionToDelete.visibleStart(), CanCrossEditingBoundary)
&& isEndOfParagraph(m_selectionToDelete.visibleEnd(), CanCrossEditingBoundary)
&& !lineBreakExistsAtVisiblePosition(m_selectionToDelete.visibleEnd());
if (m_needPlaceholder) {
// Don't need a placeholder when deleting a selection that starts just before a table
// and ends inside it (we do need placeholders to hold open empty cells, but that's
// handled elsewhere).
if (Node* table = isLastPositionBeforeTable(m_selectionToDelete.visibleStart()))
if (m_selectionToDelete.end().deprecatedNode()->isDescendantOf(table))
m_needPlaceholder = false;
}
// set up our state
initializePositionData();
// Delete any text that may hinder our ability to fixup whitespace after the delete
deleteInsignificantTextDownstream(m_trailingWhitespace);
saveTypingStyleState();
// deleting just a BR is handled specially, at least because we do not
// want to replace it with a placeholder BR!
if (handleSpecialCaseBRDelete()) {
calculateTypingStyleAfterDelete();
setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional()));
clearTransientState();
rebalanceWhitespace();
return;
}
handleGeneralDelete();
fixupWhitespace();
mergeParagraphs();
removePreviouslySelectedEmptyTableRows();
RefPtr<Node> placeholder = m_needPlaceholder ? createBreakElement(document()).get() : 0;
if (placeholder) {
if (m_sanitizeMarkup)
removeRedundantBlocks();
insertNodeAt(placeholder.get(), m_endingPosition);
}
rebalanceWhitespaceAt(m_endingPosition);
calculateTypingStyleAfterDelete();
if (!originalString.isEmpty()) {
if (Frame* frame = document()->frame())
frame->editor().deletedAutocorrectionAtPosition(m_endingPosition, originalString);
}
setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional()));
clearTransientState();
}
EditAction DeleteSelectionCommand::editingAction() const
{
// Note that DeleteSelectionCommand is also used when the user presses the Delete key,
// but in that case there's a TypingCommand that supplies the editingAction(), so
// the Undo menu correctly shows "Undo Typing"
return EditActionCut;
}
// Normally deletion doesn't preserve the typing style that was present before it. For example,
// type a character, Bold, then delete the character and start typing. The Bold typing style shouldn't
// stick around. Deletion should preserve a typing style that *it* sets, however.
bool DeleteSelectionCommand::preservesTypingStyle() const
{
return m_typingStyle;
}
} // namespace WebCore