Source/WebCore/editing/IndentOutdentCommand.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2006, 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 "IndentOutdentCommand.h"

 #include "Document.h"
 #include "Editing.h"
 #include "ElementTraversal.h"
 #include "HTMLBRElement.h"
 #include "HTMLNames.h"
 #include "HTMLOListElement.h"
 #include "HTMLUListElement.h"
 #include "InsertLineBreakCommand.h"
 #include "InsertListCommand.h"
 #include "RenderElement.h"
 #include "SplitElementCommand.h"
 #include "Text.h"
 #include "VisibleUnits.h"

 namespace WebCore {

 using namespace HTMLNames;

 static bool isListOrIndentBlockquote(const Node* node)
 {
     return node && (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(blockquoteTag));
 }

 IndentOutdentCommand::IndentOutdentCommand(Document& document, EIndentType typeOfAction)
     : ApplyBlockElementCommand(document, blockquoteTag, "margin: 0 0 0 40px; border: none; padding: 0px;")
     , m_typeOfAction(typeOfAction)
 {
 }

 bool IndentOutdentCommand::tryIndentingAsListItem(const Position& start, const Position& end)
 {
     // If our selection is not inside a list, bail out.
     RefPtr lastNodeInSelectedParagraph = start.deprecatedNode();
     RefPtr<Element> listNode = enclosingList(lastNodeInSelectedParagraph.get());
     if (!listNode)
         return false;

     // Find the block that we want to indent.  If it's not a list item (e.g., a div inside a list item), we bail out.
     RefPtr<Element> selectedListItem = enclosingBlock(lastNodeInSelectedParagraph.get());

     if (!selectedListItem || !selectedListItem->hasTagName(liTag))
         return false;

     // FIXME: previousElementSibling does not ignore non-rendered content like <span></span>.  Should we?
     RefPtr<Element> previousList = ElementTraversal::previousSibling(*selectedListItem);
     RefPtr<Element> nextList = ElementTraversal::nextSibling(*selectedListItem);

     RefPtr<Element> newList;
     if (is<HTMLUListElement>(*listNode))
         newList = HTMLUListElement::create(document());
     else
         newList = HTMLOListElement::create(document());
     insertNodeBefore(*newList, *selectedListItem);

     moveParagraphWithClones(start, end, newList.get(), selectedListItem.get());

     if (canMergeLists(previousList.get(), newList.get()))
         mergeIdenticalElements(*previousList, *newList);
     if (canMergeLists(newList.get(), nextList.get()))
         mergeIdenticalElements(*newList, *nextList);

     return true;
 }

 void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, RefPtr<Element>& targetBlockquote)
 {
     RefPtr enclosingCell = enclosingNodeOfType(start, &isTableCell);
     auto nodeToSplitTo = [&]() -> RefPtr<Node> {
         if (enclosingCell)
             return enclosingCell;
         if (enclosingList(start.containerNode()))
             return enclosingBlock(start.containerNode());
         return editableRootForPosition(start);
     }();

     if (!nodeToSplitTo)
         return;

     RefPtr<Node> nodeAfterStart = start.computeNodeAfterPosition();
     RefPtr<Node> outerBlock = (start.containerNode() == nodeToSplitTo) ? start.containerNode() : splitTreeToNode(*start.containerNode(), *nodeToSplitTo);
     if (!outerBlock)
         return;

     VisiblePosition startOfContents = start;
     if (!targetBlockquote) {
         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
         // this by splitting all parents of the current paragraph up to that point.
         targetBlockquote = createBlockElement();
         if (outerBlock == nodeToSplitTo)
             insertNodeAt(*targetBlockquote, start);
         else
             insertNodeBefore(*targetBlockquote, *outerBlock);
         startOfContents = positionInParentAfterNode(targetBlockquote.get());
     }

     if (startOfContents.deepEquivalent().containerNode() && !startOfContents.deepEquivalent().containerNode()->isDescendantOf(outerBlock.get()) && startOfContents.deepEquivalent().containerNode()->parentNode() != outerBlock->parentNode())
         return;

     moveParagraphWithClones(startOfContents, end, targetBlockquote.get(), outerBlock.get());
 }

 void IndentOutdentCommand::outdentParagraph()
 {
     VisiblePosition visibleStartOfParagraph = startOfParagraph(endingSelection().visibleStart());
     VisiblePosition visibleEndOfParagraph = endOfParagraph(visibleStartOfParagraph);

     RefPtr enclosingNode = downcast<HTMLElement>(enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isListOrIndentBlockquote));
     if (!enclosingNode || !enclosingNode->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
         return;

     // Use InsertListCommand to remove the selection from the list
     if (enclosingNode->hasTagName(olTag)) {
         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::Type::OrderedList));
         return;
     }
     if (enclosingNode->hasTagName(ulTag)) {
         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::Type::UnorderedList));
         return;
     }

     // The selection is inside a blockquote i.e. enclosingNode is a blockquote
     VisiblePosition positionInEnclosingBlock = VisiblePosition(firstPositionInNode(enclosingNode.get()));
     // If the blockquote is inline, the start of the enclosing block coincides with
     // positionInEnclosingBlock.
     VisiblePosition startOfEnclosingBlock = (enclosingNode->renderer() && enclosingNode->renderer()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
     VisiblePosition lastPositionInEnclosingBlock = VisiblePosition(lastPositionInNode(enclosingNode.get()));
     VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
     if (visibleStartOfParagraph == startOfEnclosingBlock &&
         visibleEndOfParagraph == endOfEnclosingBlock) {
         // The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
         RefPtr splitPoint = enclosingNode->nextSibling();
         removeNodePreservingChildren(*enclosingNode);
         // outdentRegion() assumes it is operating on the first paragraph of an enclosing blockquote, but if there are multiply nested blockquotes and we've
         // just removed one, then this assumption isn't true. By splitting the next containing blockquote after this node, we keep this assumption true
         if (splitPoint) {
             if (ContainerNode* splitPointParent = splitPoint->parentNode()) {
                 if (splitPointParent->hasTagName(blockquoteTag)
                     && !splitPoint->hasTagName(blockquoteTag)
                     && splitPointParent->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
                     splitElement(downcast<Element>(*splitPointParent), *splitPoint);
             }
         }

         document().updateLayoutIgnorePendingStylesheets();
         visibleStartOfParagraph = VisiblePosition(visibleStartOfParagraph.deepEquivalent());
         visibleEndOfParagraph = VisiblePosition(visibleEndOfParagraph.deepEquivalent());
         if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph))
             insertNodeAt(HTMLBRElement::create(document()), visibleStartOfParagraph.deepEquivalent());
         if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
             insertNodeAt(HTMLBRElement::create(document()), visibleEndOfParagraph.deepEquivalent());

         return;
     }

     RefPtr startOfParagraphNode = visibleStartOfParagraph.deepEquivalent().deprecatedNode();
     RefPtr enclosingBlockFlow = enclosingBlock(startOfParagraphNode.get());
     RefPtr<Node> splitBlockquoteNode = enclosingNode;
     if (enclosingBlockFlow != enclosingNode)
         splitBlockquoteNode = splitTreeToNode(*startOfParagraphNode, *enclosingNode, true);
     else {
         // We split the blockquote at where we start outdenting.
         RefPtr highestInlineNode = highestEnclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), isInline, CannotCrossEditingBoundary, enclosingBlockFlow.get());
         splitElement(*enclosingNode, highestInlineNode ? *highestInlineNode : *visibleStartOfParagraph.deepEquivalent().deprecatedNode());
     }
     auto placeholder = HTMLBRElement::create(document());
     insertNodeBefore(placeholder, *splitBlockquoteNode);
     if (placeholder->isConnected())
         moveParagraph(startOfParagraph(visibleStartOfParagraph), endOfParagraph(visibleEndOfParagraph), positionBeforeNode(placeholder.ptr()), true);
 }

 // FIXME: We should merge this function with ApplyBlockElementCommand::formatSelection
 void IndentOutdentCommand::outdentRegion(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
 {
     VisiblePosition endOfLastParagraph = endOfParagraph(endOfSelection);

     if (endOfParagraph(startOfSelection) == endOfLastParagraph) {
         outdentParagraph();
         return;
     }

     Position originalSelectionEnd = endingSelection().end();
     VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
     VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());

     while (endOfCurrentParagraph != endAfterSelection) {
         VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
         if (endOfCurrentParagraph == endOfLastParagraph)
             setEndingSelection(VisibleSelection(originalSelectionEnd));
         else
             setEndingSelection(endOfCurrentParagraph);

         outdentParagraph();

         // outdentParagraph could move more than one paragraph if the paragraph
         // is in a list item. As a result, endAfterSelection and endOfNextParagraph
         // could refer to positions no longer in the document.
         if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().anchorNode()->isConnected())
             break;

         if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().anchorNode()->isConnected()) {
             endOfCurrentParagraph = endingSelection().end();
             endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
         }
         endOfCurrentParagraph = endOfNextParagraph;

         if (endOfCurrentParagraph.isNull()) {
             // If the end of the current paragraph is null, we'll end up looping infinitely, since the end of the next paragraph
             // (and the paragraph after that, and so on) will always be null. To avoid this infinite loop, just bail.
             break;
         }
     }
 }

 void IndentOutdentCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
 {
     if (m_typeOfAction == Indent)
         ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
     else
         outdentRegion(startOfSelection, endOfSelection);
 }

 void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, RefPtr<Element>& blockquoteForNextIndent)
 {
     if (tryIndentingAsListItem(start, end))
         blockquoteForNextIndent = nullptr;
     else
         indentIntoBlockquote(start, end, blockquoteForNextIndent);
 }

 }
	/*
	* Copyright (C) 2006, 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 "IndentOutdentCommand.h"

	#include "Document.h"
	#include "Editing.h"
	#include "ElementTraversal.h"
	#include "HTMLBRElement.h"
	#include "HTMLNames.h"
	#include "HTMLOListElement.h"
	#include "HTMLUListElement.h"
	#include "InsertLineBreakCommand.h"
	#include "InsertListCommand.h"
	#include "RenderElement.h"
	#include "SplitElementCommand.h"
	#include "Text.h"
	#include "VisibleUnits.h"

	namespace WebCore {

	using namespace HTMLNames;

	static bool isListOrIndentBlockquote(const Node* node)
	{
	return node && (node->hasTagName(ulTag) \|\| node->hasTagName(olTag) \|\| node->hasTagName(blockquoteTag));
	}

	IndentOutdentCommand::IndentOutdentCommand(Document& document, EIndentType typeOfAction)
	: ApplyBlockElementCommand(document, blockquoteTag, "margin: 0 0 0 40px; border: none; padding: 0px;")
	, m_typeOfAction(typeOfAction)
	{
	}

	bool IndentOutdentCommand::tryIndentingAsListItem(const Position& start, const Position& end)
	{
	// If our selection is not inside a list, bail out.
	RefPtr lastNodeInSelectedParagraph = start.deprecatedNode();
	RefPtr<Element> listNode = enclosingList(lastNodeInSelectedParagraph.get());
	if (!listNode)
	return false;

	// Find the block that we want to indent. If it's not a list item (e.g., a div inside a list item), we bail out.
	RefPtr<Element> selectedListItem = enclosingBlock(lastNodeInSelectedParagraph.get());

	if (!selectedListItem \|\| !selectedListItem->hasTagName(liTag))
	return false;

	// FIXME: previousElementSibling does not ignore non-rendered content like <span></span>. Should we?
	RefPtr<Element> previousList = ElementTraversal::previousSibling(*selectedListItem);
	RefPtr<Element> nextList = ElementTraversal::nextSibling(*selectedListItem);

	RefPtr<Element> newList;
	if (is<HTMLUListElement>(*listNode))
	newList = HTMLUListElement::create(document());
	else
	newList = HTMLOListElement::create(document());
	insertNodeBefore(newList, selectedListItem);

	moveParagraphWithClones(start, end, newList.get(), selectedListItem.get());

	if (canMergeLists(previousList.get(), newList.get()))
	mergeIdenticalElements(previousList, newList);
	if (canMergeLists(newList.get(), nextList.get()))
	mergeIdenticalElements(newList, nextList);

	return true;
	}

	void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, RefPtr<Element>& targetBlockquote)
	{
	RefPtr enclosingCell = enclosingNodeOfType(start, &isTableCell);
	auto nodeToSplitTo = [&]() -> RefPtr<Node> {
	if (enclosingCell)
	return enclosingCell;
	if (enclosingList(start.containerNode()))
	return enclosingBlock(start.containerNode());
	return editableRootForPosition(start);
	}();

	if (!nodeToSplitTo)
	return;

	RefPtr<Node> nodeAfterStart = start.computeNodeAfterPosition();
	RefPtr<Node> outerBlock = (start.containerNode() == nodeToSplitTo) ? start.containerNode() : splitTreeToNode(start.containerNode(), nodeToSplitTo);
	if (!outerBlock)
	return;

	VisiblePosition startOfContents = start;
	if (!targetBlockquote) {
	// Create a new blockquote and insert it as a child of the root editable element. We accomplish
	// this by splitting all parents of the current paragraph up to that point.
	targetBlockquote = createBlockElement();
	if (outerBlock == nodeToSplitTo)
	insertNodeAt(*targetBlockquote, start);
	else
	insertNodeBefore(targetBlockquote, outerBlock);
	startOfContents = positionInParentAfterNode(targetBlockquote.get());
	}

	if (startOfContents.deepEquivalent().containerNode() && !startOfContents.deepEquivalent().containerNode()->isDescendantOf(outerBlock.get()) && startOfContents.deepEquivalent().containerNode()->parentNode() != outerBlock->parentNode())
	return;

	moveParagraphWithClones(startOfContents, end, targetBlockquote.get(), outerBlock.get());
	}

	void IndentOutdentCommand::outdentParagraph()
	{
	VisiblePosition visibleStartOfParagraph = startOfParagraph(endingSelection().visibleStart());
	VisiblePosition visibleEndOfParagraph = endOfParagraph(visibleStartOfParagraph);

	RefPtr enclosingNode = downcast<HTMLElement>(enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isListOrIndentBlockquote));
	if (!enclosingNode \|\| !enclosingNode->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
	return;

	// Use InsertListCommand to remove the selection from the list
	if (enclosingNode->hasTagName(olTag)) {
	applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::Type::OrderedList));
	return;
	}
	if (enclosingNode->hasTagName(ulTag)) {
	applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::Type::UnorderedList));
	return;
	}

	// The selection is inside a blockquote i.e. enclosingNode is a blockquote
	VisiblePosition positionInEnclosingBlock = VisiblePosition(firstPositionInNode(enclosingNode.get()));
	// If the blockquote is inline, the start of the enclosing block coincides with
	// positionInEnclosingBlock.
	VisiblePosition startOfEnclosingBlock = (enclosingNode->renderer() && enclosingNode->renderer()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
	VisiblePosition lastPositionInEnclosingBlock = VisiblePosition(lastPositionInNode(enclosingNode.get()));
	VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
	if (visibleStartOfParagraph == startOfEnclosingBlock &&
	visibleEndOfParagraph == endOfEnclosingBlock) {
	// The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
	RefPtr splitPoint = enclosingNode->nextSibling();
	removeNodePreservingChildren(*enclosingNode);
	// outdentRegion() assumes it is operating on the first paragraph of an enclosing blockquote, but if there are multiply nested blockquotes and we've
	// just removed one, then this assumption isn't true. By splitting the next containing blockquote after this node, we keep this assumption true
	if (splitPoint) {
	if (ContainerNode* splitPointParent = splitPoint->parentNode()) {
	if (splitPointParent->hasTagName(blockquoteTag)
	&& !splitPoint->hasTagName(blockquoteTag)
	&& splitPointParent->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
	splitElement(downcast<Element>(splitPointParent), splitPoint);
	}
	}

	document().updateLayoutIgnorePendingStylesheets();
	visibleStartOfParagraph = VisiblePosition(visibleStartOfParagraph.deepEquivalent());
	visibleEndOfParagraph = VisiblePosition(visibleEndOfParagraph.deepEquivalent());
	if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph))
	insertNodeAt(HTMLBRElement::create(document()), visibleStartOfParagraph.deepEquivalent());
	if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
	insertNodeAt(HTMLBRElement::create(document()), visibleEndOfParagraph.deepEquivalent());

	return;
	}

	RefPtr startOfParagraphNode = visibleStartOfParagraph.deepEquivalent().deprecatedNode();
	RefPtr enclosingBlockFlow = enclosingBlock(startOfParagraphNode.get());
	RefPtr<Node> splitBlockquoteNode = enclosingNode;
	if (enclosingBlockFlow != enclosingNode)
	splitBlockquoteNode = splitTreeToNode(startOfParagraphNode, enclosingNode, true);
	else {
	// We split the blockquote at where we start outdenting.
	RefPtr highestInlineNode = highestEnclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), isInline, CannotCrossEditingBoundary, enclosingBlockFlow.get());
	splitElement(enclosingNode, highestInlineNode ? highestInlineNode : *visibleStartOfParagraph.deepEquivalent().deprecatedNode());
	}
	auto placeholder = HTMLBRElement::create(document());
	insertNodeBefore(placeholder, *splitBlockquoteNode);
	if (placeholder->isConnected())
	moveParagraph(startOfParagraph(visibleStartOfParagraph), endOfParagraph(visibleEndOfParagraph), positionBeforeNode(placeholder.ptr()), true);
	}

	// FIXME: We should merge this function with ApplyBlockElementCommand::formatSelection
	void IndentOutdentCommand::outdentRegion(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
	{
	VisiblePosition endOfLastParagraph = endOfParagraph(endOfSelection);

	if (endOfParagraph(startOfSelection) == endOfLastParagraph) {
	outdentParagraph();
	return;
	}

	Position originalSelectionEnd = endingSelection().end();
	VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
	VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());

	while (endOfCurrentParagraph != endAfterSelection) {
	VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
	if (endOfCurrentParagraph == endOfLastParagraph)
	setEndingSelection(VisibleSelection(originalSelectionEnd));
	else
	setEndingSelection(endOfCurrentParagraph);

	outdentParagraph();

	// outdentParagraph could move more than one paragraph if the paragraph
	// is in a list item. As a result, endAfterSelection and endOfNextParagraph
	// could refer to positions no longer in the document.
	if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().anchorNode()->isConnected())
	break;

	if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().anchorNode()->isConnected()) {
	endOfCurrentParagraph = endingSelection().end();
	endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
	}
	endOfCurrentParagraph = endOfNextParagraph;

	if (endOfCurrentParagraph.isNull()) {
	// If the end of the current paragraph is null, we'll end up looping infinitely, since the end of the next paragraph
	// (and the paragraph after that, and so on) will always be null. To avoid this infinite loop, just bail.
	break;
	}
	}
	}

	void IndentOutdentCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
	{
	if (m_typeOfAction == Indent)
	ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
	else
	outdentRegion(startOfSelection, endOfSelection);
	}

	void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, RefPtr<Element>& blockquoteForNextIndent)
	{
	if (tryIndentingAsListItem(start, end))
	blockquoteForNextIndent = nullptr;
	else
	indentIntoBlockquote(start, end, blockquoteForNextIndent);
	}

	}