third_party/WebKit/Source/core/editing/commands/BreakBlockquoteCommand.cpp - chromium/src - Git at Google

 /*
  * 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 "core/editing/commands/BreakBlockquoteCommand.h"

 #include "core/HTMLNames.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLQuoteElement.h"
 #include "core/layout/LayoutListItem.h"

 namespace blink {

 using namespace HTMLNames;

 namespace {

 bool isFirstVisiblePositionInNode(const VisiblePosition& visiblePosition,
                                   const ContainerNode* node) {
   if (visiblePosition.isNull())
     return false;

   if (!visiblePosition.deepEquivalent().computeContainerNode()->isDescendantOf(
           node))
     return false;

   VisiblePosition previous = previousPositionOf(visiblePosition);
   return previous.isNull() ||
          !previous.deepEquivalent().anchorNode()->isDescendantOf(node);
 }

 bool isLastVisiblePositionInNode(const VisiblePosition& visiblePosition,
                                  const ContainerNode* node) {
   if (visiblePosition.isNull())
     return false;

   if (!visiblePosition.deepEquivalent().computeContainerNode()->isDescendantOf(
           node))
     return false;

   VisiblePosition next = nextPositionOf(visiblePosition);
   return next.isNull() ||
          !next.deepEquivalent().anchorNode()->isDescendantOf(node);
 }

 }  // namespace

 BreakBlockquoteCommand::BreakBlockquoteCommand(Document& document)
     : CompositeEditCommand(document) {}

 void BreakBlockquoteCommand::doApply(EditingState* editingState) {
   if (endingSelection().isNone())
     return;

   // Delete the current selection.
   if (endingSelection().isRange()) {
     deleteSelection(editingState, false, false);
     if (editingState->isAborted())
       return;
   }

   // This is a scenario that should never happen, but we want to
   // make sure we don't dereference a null pointer below.

   DCHECK(!endingSelection().isNone());

   if (endingSelection().isNone())
     return;

   VisiblePosition visiblePos = endingSelection().visibleStartDeprecated();

   // pos is a position equivalent to the caret.  We use downstream() so that pos
   // will be in the first node that we need to move (there are a few exceptions
   // to this, see below).
   Position pos = mostForwardCaretPosition(endingSelection().start());

   // Find the top-most blockquote from the start.
   HTMLQuoteElement* topBlockquote = toHTMLQuoteElement(
       highestEnclosingNodeOfType(pos, isMailHTMLBlockquoteElement));
   if (!topBlockquote || !topBlockquote->parentNode())
     return;

   HTMLBRElement* breakElement = HTMLBRElement::create(document());

   bool isLastVisPosInNode =
       isLastVisiblePositionInNode(visiblePos, topBlockquote);

   // If the position is at the beginning of the top quoted content, we don't
   // need to break the quote. Instead, insert the break before the blockquote,
   // unless the position is as the end of the the quoted content.
   if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) &&
       !isLastVisPosInNode) {
     insertNodeBefore(breakElement, topBlockquote, editingState);
     if (editingState->isAborted())
       return;
     setEndingSelection(createVisibleSelectionDeprecated(
         Position::beforeNode(breakElement), TextAffinity::Downstream,
         endingSelection().isDirectional()));
     rebalanceWhitespace();
     return;
   }

   // Insert a break after the top blockquote.
   insertNodeAfter(breakElement, topBlockquote, editingState);
   if (editingState->isAborted())
     return;

   // If we're inserting the break at the end of the quoted content, we don't
   // need to break the quote.
   if (isLastVisPosInNode) {
     setEndingSelection(createVisibleSelectionDeprecated(
         Position::beforeNode(breakElement), TextAffinity::Downstream,
         endingSelection().isDirectional()));
     rebalanceWhitespace();
     return;
   }

   // Don't move a line break just after the caret.  Doing so would create an
   // extra, empty paragraph in the new blockquote.
   if (lineBreakExistsAtVisiblePosition(visiblePos)) {
     pos = nextPositionOf(pos, PositionMoveType::GraphemeCluster);
   }

   // Adjust the position so we don't split at the beginning of a quote.
   while (isFirstVisiblePositionInNode(createVisiblePositionDeprecated(pos),
                                       toHTMLQuoteElement(enclosingNodeOfType(
                                           pos, isMailHTMLBlockquoteElement)))) {
     pos = previousPositionOf(pos, PositionMoveType::GraphemeCluster);
   }

   // startNode is the first node that we need to move to the new blockquote.
   Node* startNode = pos.anchorNode();
   DCHECK(startNode);

   // Split at pos if in the middle of a text node.
   if (startNode->isTextNode()) {
     Text* textNode = toText(startNode);
     int textOffset = pos.computeOffsetInContainerNode();
     if ((unsigned)textOffset >= textNode->length()) {
       startNode = NodeTraversal::next(*startNode);
       DCHECK(startNode);
     } else if (textOffset > 0) {
       splitTextNode(textNode, textOffset);
     }
   } else if (pos.computeEditingOffset() > 0) {
     Node* childAtOffset =
         NodeTraversal::childAt(*startNode, pos.computeEditingOffset());
     startNode = childAtOffset ? childAtOffset : NodeTraversal::next(*startNode);
     DCHECK(startNode);
   }

   // If there's nothing inside topBlockquote to move, we're finished.
   if (!startNode->isDescendantOf(topBlockquote)) {
     setEndingSelection(createVisibleSelectionDeprecated(
         createVisiblePositionDeprecated(firstPositionInOrBeforeNode(startNode)),
         endingSelection().isDirectional()));
     return;
   }

   // Build up list of ancestors in between the start node and the top
   // blockquote.
   HeapVector<Member<Element>> ancestors;
   for (Element* node = startNode->parentElement();
        node && node != topBlockquote; node = node->parentElement())
     ancestors.append(node);

   // Insert a clone of the top blockquote after the break.
   Element* clonedBlockquote = topBlockquote->cloneElementWithoutChildren();
   insertNodeAfter(clonedBlockquote, breakElement, editingState);
   if (editingState->isAborted())
     return;

   // Clone startNode's ancestors into the cloned blockquote.
   // On exiting this loop, clonedAncestor is the lowest ancestor
   // that was cloned (i.e. the clone of either ancestors.last()
   // or clonedBlockquote if ancestors is empty).
   Element* clonedAncestor = clonedBlockquote;
   for (size_t i = ancestors.size(); i != 0; --i) {
     Element* clonedChild = ancestors[i - 1]->cloneElementWithoutChildren();
     // Preserve list item numbering in cloned lists.
     if (isHTMLOListElement(*clonedChild)) {
       Node* listChildNode = i > 1 ? ancestors[i - 2].get() : startNode;
       // The first child of the cloned list might not be a list item element,
       // find the first one so that we know where to start numbering.
       while (listChildNode && !isHTMLLIElement(*listChildNode))
         listChildNode = listChildNode->nextSibling();
       if (isListItem(listChildNode))
         setNodeAttribute(
             clonedChild, startAttr,
             AtomicString::number(
                 toLayoutListItem(listChildNode->layoutObject())->value()));
     }

     appendNode(clonedChild, clonedAncestor, editingState);
     if (editingState->isAborted())
       return;
     clonedAncestor = clonedChild;
   }

   moveRemainingSiblingsToNewParent(startNode, 0, clonedAncestor, editingState);
   if (editingState->isAborted())
     return;

   if (!ancestors.isEmpty()) {
     // Split the tree up the ancestor chain until the topBlockquote
     // Throughout this loop, clonedParent is the clone of ancestor's parent.
     // This is so we can clone ancestor's siblings and place the clones
     // into the clone corresponding to the ancestor's parent.
     Element* ancestor = nullptr;
     Element* clonedParent = nullptr;
     for (ancestor = ancestors.first(),
         clonedParent = clonedAncestor->parentElement();
          ancestor && ancestor != topBlockquote;
          ancestor = ancestor->parentElement(),
         clonedParent = clonedParent->parentElement()) {
       moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, clonedParent,
                                        editingState);
       if (editingState->isAborted())
         return;
     }

     // If the startNode's original parent is now empty, remove it
     Element* originalParent = ancestors.first().get();
     if (!originalParent->hasChildren()) {
       removeNode(originalParent, editingState);
       if (editingState->isAborted())
         return;
     }
   }

   // Make sure the cloned block quote renders.
   addBlockPlaceholderIfNeeded(clonedBlockquote, editingState);
   if (editingState->isAborted())
     return;

   // Put the selection right before the break.
   setEndingSelection(createVisibleSelectionDeprecated(
       Position::beforeNode(breakElement), TextAffinity::Downstream,
       endingSelection().isDirectional()));
   rebalanceWhitespace();
 }

 }  // namespace blink
	/*
	* 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 "core/editing/commands/BreakBlockquoteCommand.h"

	#include "core/HTMLNames.h"
	#include "core/dom/NodeTraversal.h"
	#include "core/dom/Text.h"
	#include "core/editing/EditingUtilities.h"
	#include "core/editing/VisiblePosition.h"
	#include "core/html/HTMLBRElement.h"
	#include "core/html/HTMLElement.h"
	#include "core/html/HTMLQuoteElement.h"
	#include "core/layout/LayoutListItem.h"

	namespace blink {

	using namespace HTMLNames;

	namespace {

	bool isFirstVisiblePositionInNode(const VisiblePosition& visiblePosition,
	const ContainerNode* node) {
	if (visiblePosition.isNull())
	return false;

	if (!visiblePosition.deepEquivalent().computeContainerNode()->isDescendantOf(
	node))
	return false;

	VisiblePosition previous = previousPositionOf(visiblePosition);
	return previous.isNull() \|\|
	!previous.deepEquivalent().anchorNode()->isDescendantOf(node);
	}

	bool isLastVisiblePositionInNode(const VisiblePosition& visiblePosition,
	const ContainerNode* node) {
	if (visiblePosition.isNull())
	return false;

	if (!visiblePosition.deepEquivalent().computeContainerNode()->isDescendantOf(
	node))
	return false;

	VisiblePosition next = nextPositionOf(visiblePosition);
	return next.isNull() \|\|
	!next.deepEquivalent().anchorNode()->isDescendantOf(node);
	}

	} // namespace

	BreakBlockquoteCommand::BreakBlockquoteCommand(Document& document)
	: CompositeEditCommand(document) {}

	void BreakBlockquoteCommand::doApply(EditingState* editingState) {
	if (endingSelection().isNone())
	return;

	// Delete the current selection.
	if (endingSelection().isRange()) {
	deleteSelection(editingState, false, false);
	if (editingState->isAborted())
	return;
	}

	// This is a scenario that should never happen, but we want to
	// make sure we don't dereference a null pointer below.

	DCHECK(!endingSelection().isNone());

	if (endingSelection().isNone())
	return;

	VisiblePosition visiblePos = endingSelection().visibleStartDeprecated();

	// pos is a position equivalent to the caret. We use downstream() so that pos
	// will be in the first node that we need to move (there are a few exceptions
	// to this, see below).
	Position pos = mostForwardCaretPosition(endingSelection().start());

	// Find the top-most blockquote from the start.
	HTMLQuoteElement* topBlockquote = toHTMLQuoteElement(
	highestEnclosingNodeOfType(pos, isMailHTMLBlockquoteElement));
	if (!topBlockquote \|\| !topBlockquote->parentNode())
	return;

	HTMLBRElement* breakElement = HTMLBRElement::create(document());

	bool isLastVisPosInNode =
	isLastVisiblePositionInNode(visiblePos, topBlockquote);

	// If the position is at the beginning of the top quoted content, we don't
	// need to break the quote. Instead, insert the break before the blockquote,
	// unless the position is as the end of the the quoted content.
	if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) &&
	!isLastVisPosInNode) {
	insertNodeBefore(breakElement, topBlockquote, editingState);
	if (editingState->isAborted())
	return;
	setEndingSelection(createVisibleSelectionDeprecated(
	Position::beforeNode(breakElement), TextAffinity::Downstream,
	endingSelection().isDirectional()));
	rebalanceWhitespace();
	return;
	}

	// Insert a break after the top blockquote.
	insertNodeAfter(breakElement, topBlockquote, editingState);
	if (editingState->isAborted())
	return;

	// If we're inserting the break at the end of the quoted content, we don't
	// need to break the quote.
	if (isLastVisPosInNode) {
	setEndingSelection(createVisibleSelectionDeprecated(
	Position::beforeNode(breakElement), TextAffinity::Downstream,
	endingSelection().isDirectional()));
	rebalanceWhitespace();
	return;
	}

	// Don't move a line break just after the caret. Doing so would create an
	// extra, empty paragraph in the new blockquote.
	if (lineBreakExistsAtVisiblePosition(visiblePos)) {
	pos = nextPositionOf(pos, PositionMoveType::GraphemeCluster);
	}

	// Adjust the position so we don't split at the beginning of a quote.
	while (isFirstVisiblePositionInNode(createVisiblePositionDeprecated(pos),
	toHTMLQuoteElement(enclosingNodeOfType(
	pos, isMailHTMLBlockquoteElement)))) {
	pos = previousPositionOf(pos, PositionMoveType::GraphemeCluster);
	}

	// startNode is the first node that we need to move to the new blockquote.
	Node* startNode = pos.anchorNode();
	DCHECK(startNode);

	// Split at pos if in the middle of a text node.
	if (startNode->isTextNode()) {
	Text* textNode = toText(startNode);
	int textOffset = pos.computeOffsetInContainerNode();
	if ((unsigned)textOffset >= textNode->length()) {
	startNode = NodeTraversal::next(*startNode);
	DCHECK(startNode);
	} else if (textOffset > 0) {
	splitTextNode(textNode, textOffset);
	}
	} else if (pos.computeEditingOffset() > 0) {
	Node* childAtOffset =
	NodeTraversal::childAt(*startNode, pos.computeEditingOffset());
	startNode = childAtOffset ? childAtOffset : NodeTraversal::next(*startNode);
	DCHECK(startNode);
	}

	// If there's nothing inside topBlockquote to move, we're finished.
	if (!startNode->isDescendantOf(topBlockquote)) {
	setEndingSelection(createVisibleSelectionDeprecated(
	createVisiblePositionDeprecated(firstPositionInOrBeforeNode(startNode)),
	endingSelection().isDirectional()));
	return;
	}

	// Build up list of ancestors in between the start node and the top
	// blockquote.
	HeapVector<Member<Element>> ancestors;
	for (Element* node = startNode->parentElement();
	node && node != topBlockquote; node = node->parentElement())
	ancestors.append(node);

	// Insert a clone of the top blockquote after the break.
	Element* clonedBlockquote = topBlockquote->cloneElementWithoutChildren();
	insertNodeAfter(clonedBlockquote, breakElement, editingState);
	if (editingState->isAborted())
	return;

	// Clone startNode's ancestors into the cloned blockquote.
	// On exiting this loop, clonedAncestor is the lowest ancestor
	// that was cloned (i.e. the clone of either ancestors.last()
	// or clonedBlockquote if ancestors is empty).
	Element* clonedAncestor = clonedBlockquote;
	for (size_t i = ancestors.size(); i != 0; --i) {
	Element* clonedChild = ancestors[i - 1]->cloneElementWithoutChildren();
	// Preserve list item numbering in cloned lists.
	if (isHTMLOListElement(*clonedChild)) {
	Node* listChildNode = i > 1 ? ancestors[i - 2].get() : startNode;
	// The first child of the cloned list might not be a list item element,
	// find the first one so that we know where to start numbering.
	while (listChildNode && !isHTMLLIElement(*listChildNode))
	listChildNode = listChildNode->nextSibling();
	if (isListItem(listChildNode))
	setNodeAttribute(
	clonedChild, startAttr,
	AtomicString::number(
	toLayoutListItem(listChildNode->layoutObject())->value()));
	}

	appendNode(clonedChild, clonedAncestor, editingState);
	if (editingState->isAborted())
	return;
	clonedAncestor = clonedChild;
	}

	moveRemainingSiblingsToNewParent(startNode, 0, clonedAncestor, editingState);
	if (editingState->isAborted())
	return;

	if (!ancestors.isEmpty()) {
	// Split the tree up the ancestor chain until the topBlockquote
	// Throughout this loop, clonedParent is the clone of ancestor's parent.
	// This is so we can clone ancestor's siblings and place the clones
	// into the clone corresponding to the ancestor's parent.
	Element* ancestor = nullptr;
	Element* clonedParent = nullptr;
	for (ancestor = ancestors.first(),
	clonedParent = clonedAncestor->parentElement();
	ancestor && ancestor != topBlockquote;
	ancestor = ancestor->parentElement(),
	clonedParent = clonedParent->parentElement()) {
	moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, clonedParent,
	editingState);
	if (editingState->isAborted())
	return;
	}

	// If the startNode's original parent is now empty, remove it
	Element* originalParent = ancestors.first().get();
	if (!originalParent->hasChildren()) {
	removeNode(originalParent, editingState);
	if (editingState->isAborted())
	return;
	}
	}

	// Make sure the cloned block quote renders.
	addBlockPlaceholderIfNeeded(clonedBlockquote, editingState);
	if (editingState->isAborted())
	return;

	// Put the selection right before the break.
	setEndingSelection(createVisibleSelectionDeprecated(
	Position::beforeNode(breakElement), TextAffinity::Downstream,
	endingSelection().isDirectional()));
	rebalanceWhitespace();
	}

	} // namespace blink