third_party/WebKit/Source/core/editing/commands/IndentOutdentCommand.cpp - chromium/src - 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 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 (IndentOutdentCommandINCLUDING, 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 "core/editing/commands/IndentOutdentCommand.h"

 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/commands/InsertListCommand.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLElement.h"
 #include "core/layout/LayoutObject.h"

 namespace blink {

 using namespace HTMLNames;

 // Returns true if |node| is UL, OL, or BLOCKQUOTE with "display:block".
 // "Outdent" command considers <BLOCKQUOTE style="display:inline"> makes
 // indentation.
 static bool isHTMLListOrBlockquoteElement(const Node* node)
 {
     if (!node || !node->isHTMLElement())
         return false;
     if (!node->layoutObject() || !node->layoutObject()->isLayoutBlock())
         return false;
     const HTMLElement& element = toHTMLElement(*node);
     // TODO(yosin): We should check OL/UL element has "list-style-type" CSS
     // property to make sure they layout contents as list.
     return isHTMLUListElement(element) || isHTMLOListElement(element) || element.hasTagName(blockquoteTag);
 }

 static bool isInline(const Node* node)
 {
     return node && node->layoutObject() && node->layoutObject()->isInline();
 }


 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, EditingState* editingState)
 {
     // If our selection is not inside a list, bail out.
     Node* lastNodeInSelectedParagraph = start.anchorNode();
     HTMLElement* listElement = enclosingList(lastNodeInSelectedParagraph);
     if (!listElement)
         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.
     Element* selectedListItem = enclosingBlock(lastNodeInSelectedParagraph);

     // FIXME: we need to deal with the case where there is no li (malformed HTML)
     if (!isHTMLLIElement(selectedListItem))
         return false;

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

     // We should calculate visible range in list item because inserting new
     // list element will change visibility of list item, e.g. :first-child
     // CSS selector.
     HTMLElement* newList = toHTMLElement(document().createElement(listElement->tagQName(), CreatedByCloneNode));
     insertNodeBefore(newList, selectedListItem, editingState);
     if (editingState->isAborted())
         return false;

     // We should clone all the children of the list item for indenting purposes. However, in case the current
     // selection does not encompass all its children, we need to explicitally handle the same. The original
     // list item too would require proper deletion in that case.
     if (end.anchorNode() == selectedListItem || end.anchorNode()->isDescendantOf(selectedListItem->lastChild())) {
         moveParagraphWithClones(createVisiblePosition(start), createVisiblePosition(end), newList, selectedListItem, editingState);
     } else {
         moveParagraphWithClones(createVisiblePosition(start), createVisiblePosition(Position::afterNode(selectedListItem->lastChild())), newList, selectedListItem, editingState);
         if (editingState->isAborted())
             return false;
         removeNode(selectedListItem, editingState);
     }
     if (editingState->isAborted())
         return false;

     if (canMergeLists(previousList, newList)) {
         mergeIdenticalElements(previousList, newList, editingState);
         if (editingState->isAborted())
             return false;
     }
     if (canMergeLists(newList, nextList)) {
         mergeIdenticalElements(newList, nextList, editingState);
         if (editingState->isAborted())
             return false;
     }

     return true;
 }

 void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, HTMLElement*& targetBlockquote, EditingState* editingState)
 {
     Element* enclosingCell = toElement(enclosingNodeOfType(start, &isTableCell));
     Element* elementToSplitTo;
     if (enclosingCell)
         elementToSplitTo = enclosingCell;
     else if (enclosingList(start.computeContainerNode()))
         elementToSplitTo = enclosingBlock(start.computeContainerNode());
     else
         elementToSplitTo = rootEditableElementOf(start);

     if (!elementToSplitTo)
         return;

     Node* outerBlock = (start.computeContainerNode() == elementToSplitTo) ? start.computeContainerNode() : splitTreeToNode(start.computeContainerNode(), elementToSplitTo);

     VisiblePosition startOfContents = createVisiblePosition(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 == start.computeContainerNode())
             insertNodeAt(targetBlockquote, start, editingState);
         else
             insertNodeBefore(targetBlockquote, outerBlock, editingState);
         if (editingState->isAborted())
             return;
         startOfContents = VisiblePosition::inParentAfterNode(*targetBlockquote);
     }

     VisiblePosition endOfContents = createVisiblePosition(end);
     if (startOfContents.isNull() || endOfContents.isNull())
         return;
     moveParagraphWithClones(startOfContents, endOfContents, targetBlockquote, outerBlock, editingState);
 }

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

     HTMLElement* enclosingElement = toHTMLElement(enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isHTMLListOrBlockquoteElement));
     if (!enclosingElement || !enclosingElement->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
         return;

     // Use InsertListCommand to remove the selection from the list
     if (isHTMLOListElement(*enclosingElement)) {
         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::OrderedList), editingState);
         return;
     }
     if (isHTMLUListElement(*enclosingElement)) {
         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::UnorderedList), editingState);
         return;
     }

     // The selection is inside a blockquote i.e. enclosingNode is a blockquote
     VisiblePosition positionInEnclosingBlock = VisiblePosition::firstPositionInNode(enclosingElement);
     // If the blockquote is inline, the start of the enclosing block coincides with
     // positionInEnclosingBlock.
     VisiblePosition startOfEnclosingBlock = (enclosingElement->layoutObject() && enclosingElement->layoutObject()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
     VisiblePosition lastPositionInEnclosingBlock = VisiblePosition::lastPositionInNode(enclosingElement);
     VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
     if (visibleStartOfParagraph.deepEquivalent() == startOfEnclosingBlock.deepEquivalent()
         && visibleEndOfParagraph.deepEquivalent() == endOfEnclosingBlock.deepEquivalent()) {
         // The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
         Node* splitPoint = enclosingElement->nextSibling();
         removeNodePreservingChildren(enclosingElement, editingState);
         if (editingState->isAborted())
             return;
         // 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 (Element* splitPointParent = splitPoint->parentElement()) {
                 if (splitPointParent->hasTagName(blockquoteTag)
                     && !splitPoint->hasTagName(blockquoteTag)
                     && splitPointParent->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
                     splitElement(splitPointParent, splitPoint);
             }
         }

         document().updateStyleAndLayoutIgnorePendingStylesheets();
         visibleStartOfParagraph = createVisiblePosition(visibleStartOfParagraph.deepEquivalent());
         visibleEndOfParagraph = createVisiblePosition(visibleEndOfParagraph.deepEquivalent());
         if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph)) {
             insertNodeAt(HTMLBRElement::create(document()), visibleStartOfParagraph.deepEquivalent(), editingState);
             if (editingState->isAborted())
                 return;
         }
         if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
             insertNodeAt(HTMLBRElement::create(document()), visibleEndOfParagraph.deepEquivalent(), editingState);
         return;
     }
     Node* splitBlockquoteNode = enclosingElement;
     if (Element* enclosingBlockFlow = enclosingBlock(visibleStartOfParagraph.deepEquivalent().anchorNode())) {
         if (enclosingBlockFlow != enclosingElement) {
             splitBlockquoteNode = splitTreeToNode(enclosingBlockFlow, enclosingElement, true);
         } else {
             // We split the blockquote at where we start outdenting.
             Node* highestInlineNode = highestEnclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), isInline, CannotCrossEditingBoundary, enclosingBlockFlow);
             splitElement(enclosingElement, highestInlineNode ? highestInlineNode : visibleStartOfParagraph.deepEquivalent().anchorNode());
         }
     }
     VisiblePosition startOfParagraphToMove = startOfParagraph(visibleStartOfParagraph);
     VisiblePosition endOfParagraphToMove = endOfParagraph(visibleEndOfParagraph);
     if (startOfParagraphToMove.isNull() || endOfParagraphToMove.isNull())
         return;
     HTMLBRElement* placeholder = HTMLBRElement::create(document());
     insertNodeBefore(placeholder, splitBlockquoteNode, editingState);
     if (editingState->isAborted())
         return;
     moveParagraph(startOfParagraphToMove, endOfParagraphToMove, createVisiblePosition(Position::beforeNode(placeholder)), editingState, true);
 }

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

     if (endOfCurrentParagraph.deepEquivalent() == endOfLastParagraph.deepEquivalent()) {
         outdentParagraph(editingState);
         return;
     }

     Position originalSelectionEnd = endingSelection().end();
     VisiblePosition endAfterSelection = endOfParagraph(nextPositionOf(endOfLastParagraph));

     while (endOfCurrentParagraph.deepEquivalent() != endAfterSelection.deepEquivalent()) {
         VisiblePosition endOfNextParagraph = endOfParagraph(nextPositionOf(endOfCurrentParagraph));
         if (endOfCurrentParagraph.deepEquivalent() == endOfLastParagraph.deepEquivalent())
             setEndingSelection(VisibleSelection(originalSelectionEnd, TextAffinity::Downstream));
         else
             setEndingSelection(endOfCurrentParagraph);

         outdentParagraph(editingState);
         if (editingState->isAborted())
             return;

         // 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().inShadowIncludingDocument())
             break;

         if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().inShadowIncludingDocument()) {
             endOfCurrentParagraph = createVisiblePosition(endingSelection().end());
             endOfNextParagraph = endOfParagraph(nextPositionOf(endOfCurrentParagraph));
         }
         endOfCurrentParagraph = endOfNextParagraph;
     }
 }

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

 void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, HTMLElement*& blockquoteForNextIndent, EditingState* editingState)
 {
     bool indentingAsListItemResult = tryIndentingAsListItem(start, end, editingState);
     if (editingState->isAborted())
         return;
     if (indentingAsListItemResult)
         blockquoteForNextIndent = nullptr;
     else
         indentIntoBlockquote(start, end, blockquoteForNextIndent, editingState);
 }

 } // namespace blink
	/*
	* 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 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 (IndentOutdentCommandINCLUDING, 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 "core/editing/commands/IndentOutdentCommand.h"

	#include "core/HTMLNames.h"
	#include "core/dom/Document.h"
	#include "core/dom/ElementTraversal.h"
	#include "core/editing/EditingUtilities.h"
	#include "core/editing/VisibleUnits.h"
	#include "core/editing/commands/InsertListCommand.h"
	#include "core/html/HTMLBRElement.h"
	#include "core/html/HTMLElement.h"
	#include "core/layout/LayoutObject.h"

	namespace blink {

	using namespace HTMLNames;

	// Returns true if \|node\| is UL, OL, or BLOCKQUOTE with "display:block".
	// "Outdent" command considers <BLOCKQUOTE style="display:inline"> makes
	// indentation.
	static bool isHTMLListOrBlockquoteElement(const Node* node)
	{
	if (!node \|\| !node->isHTMLElement())
	return false;
	if (!node->layoutObject() \|\| !node->layoutObject()->isLayoutBlock())
	return false;
	const HTMLElement& element = toHTMLElement(*node);
	// TODO(yosin): We should check OL/UL element has "list-style-type" CSS
	// property to make sure they layout contents as list.
	return isHTMLUListElement(element) \|\| isHTMLOListElement(element) \|\| element.hasTagName(blockquoteTag);
	}

	static bool isInline(const Node* node)
	{
	return node && node->layoutObject() && node->layoutObject()->isInline();
	}


	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, EditingState* editingState)
	{
	// If our selection is not inside a list, bail out.
	Node* lastNodeInSelectedParagraph = start.anchorNode();
	HTMLElement* listElement = enclosingList(lastNodeInSelectedParagraph);
	if (!listElement)
	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.
	Element* selectedListItem = enclosingBlock(lastNodeInSelectedParagraph);

	// FIXME: we need to deal with the case where there is no li (malformed HTML)
	if (!isHTMLLIElement(selectedListItem))
	return false;

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

	// We should calculate visible range in list item because inserting new
	// list element will change visibility of list item, e.g. :first-child
	// CSS selector.
	HTMLElement* newList = toHTMLElement(document().createElement(listElement->tagQName(), CreatedByCloneNode));
	insertNodeBefore(newList, selectedListItem, editingState);
	if (editingState->isAborted())
	return false;

	// We should clone all the children of the list item for indenting purposes. However, in case the current
	// selection does not encompass all its children, we need to explicitally handle the same. The original
	// list item too would require proper deletion in that case.
	if (end.anchorNode() == selectedListItem \|\| end.anchorNode()->isDescendantOf(selectedListItem->lastChild())) {
	moveParagraphWithClones(createVisiblePosition(start), createVisiblePosition(end), newList, selectedListItem, editingState);
	} else {
	moveParagraphWithClones(createVisiblePosition(start), createVisiblePosition(Position::afterNode(selectedListItem->lastChild())), newList, selectedListItem, editingState);
	if (editingState->isAborted())
	return false;
	removeNode(selectedListItem, editingState);
	}
	if (editingState->isAborted())
	return false;

	if (canMergeLists(previousList, newList)) {
	mergeIdenticalElements(previousList, newList, editingState);
	if (editingState->isAborted())
	return false;
	}
	if (canMergeLists(newList, nextList)) {
	mergeIdenticalElements(newList, nextList, editingState);
	if (editingState->isAborted())
	return false;
	}

	return true;
	}

	void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, HTMLElement& targetBlockquote, EditingState editingState)
	{
	Element* enclosingCell = toElement(enclosingNodeOfType(start, &isTableCell));
	Element* elementToSplitTo;
	if (enclosingCell)
	elementToSplitTo = enclosingCell;
	else if (enclosingList(start.computeContainerNode()))
	elementToSplitTo = enclosingBlock(start.computeContainerNode());
	else
	elementToSplitTo = rootEditableElementOf(start);

	if (!elementToSplitTo)
	return;

	Node* outerBlock = (start.computeContainerNode() == elementToSplitTo) ? start.computeContainerNode() : splitTreeToNode(start.computeContainerNode(), elementToSplitTo);

	VisiblePosition startOfContents = createVisiblePosition(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 == start.computeContainerNode())
	insertNodeAt(targetBlockquote, start, editingState);
	else
	insertNodeBefore(targetBlockquote, outerBlock, editingState);
	if (editingState->isAborted())
	return;
	startOfContents = VisiblePosition::inParentAfterNode(*targetBlockquote);
	}

	VisiblePosition endOfContents = createVisiblePosition(end);
	if (startOfContents.isNull() \|\| endOfContents.isNull())
	return;
	moveParagraphWithClones(startOfContents, endOfContents, targetBlockquote, outerBlock, editingState);
	}

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

	HTMLElement* enclosingElement = toHTMLElement(enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isHTMLListOrBlockquoteElement));
	if (!enclosingElement \|\| !enclosingElement->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
	return;

	// Use InsertListCommand to remove the selection from the list
	if (isHTMLOListElement(*enclosingElement)) {
	applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::OrderedList), editingState);
	return;
	}
	if (isHTMLUListElement(*enclosingElement)) {
	applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::UnorderedList), editingState);
	return;
	}

	// The selection is inside a blockquote i.e. enclosingNode is a blockquote
	VisiblePosition positionInEnclosingBlock = VisiblePosition::firstPositionInNode(enclosingElement);
	// If the blockquote is inline, the start of the enclosing block coincides with
	// positionInEnclosingBlock.
	VisiblePosition startOfEnclosingBlock = (enclosingElement->layoutObject() && enclosingElement->layoutObject()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
	VisiblePosition lastPositionInEnclosingBlock = VisiblePosition::lastPositionInNode(enclosingElement);
	VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
	if (visibleStartOfParagraph.deepEquivalent() == startOfEnclosingBlock.deepEquivalent()
	&& visibleEndOfParagraph.deepEquivalent() == endOfEnclosingBlock.deepEquivalent()) {
	// The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
	Node* splitPoint = enclosingElement->nextSibling();
	removeNodePreservingChildren(enclosingElement, editingState);
	if (editingState->isAborted())
	return;
	// 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 (Element* splitPointParent = splitPoint->parentElement()) {
	if (splitPointParent->hasTagName(blockquoteTag)
	&& !splitPoint->hasTagName(blockquoteTag)
	&& splitPointParent->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
	splitElement(splitPointParent, splitPoint);
	}
	}

	document().updateStyleAndLayoutIgnorePendingStylesheets();
	visibleStartOfParagraph = createVisiblePosition(visibleStartOfParagraph.deepEquivalent());
	visibleEndOfParagraph = createVisiblePosition(visibleEndOfParagraph.deepEquivalent());
	if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph)) {
	insertNodeAt(HTMLBRElement::create(document()), visibleStartOfParagraph.deepEquivalent(), editingState);
	if (editingState->isAborted())
	return;
	}
	if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
	insertNodeAt(HTMLBRElement::create(document()), visibleEndOfParagraph.deepEquivalent(), editingState);
	return;
	}
	Node* splitBlockquoteNode = enclosingElement;
	if (Element* enclosingBlockFlow = enclosingBlock(visibleStartOfParagraph.deepEquivalent().anchorNode())) {
	if (enclosingBlockFlow != enclosingElement) {
	splitBlockquoteNode = splitTreeToNode(enclosingBlockFlow, enclosingElement, true);
	} else {
	// We split the blockquote at where we start outdenting.
	Node* highestInlineNode = highestEnclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), isInline, CannotCrossEditingBoundary, enclosingBlockFlow);
	splitElement(enclosingElement, highestInlineNode ? highestInlineNode : visibleStartOfParagraph.deepEquivalent().anchorNode());
	}
	}
	VisiblePosition startOfParagraphToMove = startOfParagraph(visibleStartOfParagraph);
	VisiblePosition endOfParagraphToMove = endOfParagraph(visibleEndOfParagraph);
	if (startOfParagraphToMove.isNull() \|\| endOfParagraphToMove.isNull())
	return;
	HTMLBRElement* placeholder = HTMLBRElement::create(document());
	insertNodeBefore(placeholder, splitBlockquoteNode, editingState);
	if (editingState->isAborted())
	return;
	moveParagraph(startOfParagraphToMove, endOfParagraphToMove, createVisiblePosition(Position::beforeNode(placeholder)), editingState, true);
	}

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

	if (endOfCurrentParagraph.deepEquivalent() == endOfLastParagraph.deepEquivalent()) {
	outdentParagraph(editingState);
	return;
	}

	Position originalSelectionEnd = endingSelection().end();
	VisiblePosition endAfterSelection = endOfParagraph(nextPositionOf(endOfLastParagraph));

	while (endOfCurrentParagraph.deepEquivalent() != endAfterSelection.deepEquivalent()) {
	VisiblePosition endOfNextParagraph = endOfParagraph(nextPositionOf(endOfCurrentParagraph));
	if (endOfCurrentParagraph.deepEquivalent() == endOfLastParagraph.deepEquivalent())
	setEndingSelection(VisibleSelection(originalSelectionEnd, TextAffinity::Downstream));
	else
	setEndingSelection(endOfCurrentParagraph);

	outdentParagraph(editingState);
	if (editingState->isAborted())
	return;

	// 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().inShadowIncludingDocument())
	break;

	if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().inShadowIncludingDocument()) {
	endOfCurrentParagraph = createVisiblePosition(endingSelection().end());
	endOfNextParagraph = endOfParagraph(nextPositionOf(endOfCurrentParagraph));
	}
	endOfCurrentParagraph = endOfNextParagraph;
	}
	}

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

	void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, HTMLElement& blockquoteForNextIndent, EditingState editingState)
	{
	bool indentingAsListItemResult = tryIndentingAsListItem(start, end, editingState);
	if (editingState->isAborted())
	return;
	if (indentingAsListItemResult)
	blockquoteForNextIndent = nullptr;
	else
	indentIntoBlockquote(start, end, blockquoteForNextIndent, editingState);
	}

	} // namespace blink