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

 /*
  * Copyright (C) 2005 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 "BreakBlockquoteCommand.h"

 #include "Editing.h"
 #include "HTMLBRElement.h"
 #include "HTMLNames.h"
 #include "NodeTraversal.h"
 #include "RenderListItem.h"
 #include "Text.h"

 namespace WebCore {

 using namespace HTMLNames;

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

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

     // Delete the current selection.
     if (endingSelection().isRange())
         deleteSelection(false, false);

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

     ASSERT(!endingSelection().isNone());

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

     VisiblePosition visiblePos = endingSelection().visibleStart();

     // 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 = endingSelection().start().downstream();

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

     auto breakNode = 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 quoted content.
     if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) {
         insertNodeBefore(breakNode.copyRef(), *topBlockquote);
         setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.ptr()), DOWNSTREAM, endingSelection().isDirectional()));
         rebalanceWhitespace();
         return;
     }

     // Insert a break after the top blockquote.
     insertNodeAfter(breakNode.copyRef(), *topBlockquote);

     // If we're inserting the break at the end of the quoted content, we don't need to break the quote.
     if (isLastVisPosInNode) {
         setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.ptr()), 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 = pos.next();

     // Adjust the position so we don't split at the beginning of a quote.
     while (isFirstVisiblePositionInNode(VisiblePosition(pos), enclosingNodeOfType(pos, isMailBlockquote)))
         pos = pos.previous();

     // startNode is the first node that we need to move to the new blockquote.
     Node* startNode = pos.deprecatedNode();
     ASSERT(startNode);
     // Split at pos if in the middle of a text node.
     if (is<Text>(*startNode)) {
         Text& textNode = downcast<Text>(*startNode);
         if ((unsigned)pos.deprecatedEditingOffset() >= textNode.length()) {
             startNode = NodeTraversal::next(*startNode);
             ASSERT(startNode);
         } else if (pos.deprecatedEditingOffset() > 0)
             splitTextNode(textNode, pos.deprecatedEditingOffset());
     } else if (pos.deprecatedEditingOffset() > 0) {
         Node* childAtOffset = startNode->traverseToChildAt(pos.deprecatedEditingOffset());
         startNode = childAtOffset ? childAtOffset : NodeTraversal::next(*startNode);
         ASSERT(startNode);
     }

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

     // Build up list of ancestors in between the start node and the top blockquote.
     Vector<RefPtr<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.
     auto clonedBlockquote = downcast<Element>(*topBlockquote).cloneElementWithoutChildren(document());
     insertNodeAfter(clonedBlockquote.copyRef(), breakNode);

     // 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).
     RefPtr<Element> clonedAncestor = clonedBlockquote.copyRef();
     for (size_t i = ancestors.size(); i != 0; --i) {
         auto clonedChild = ancestors[i - 1]->cloneElementWithoutChildren(document());
         // Preserve list item numbering in cloned lists.
         if (clonedChild->isElementNode() && clonedChild->hasTagName(olTag)) {
             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 && !listChildNode->hasTagName(liTag))
                 listChildNode = listChildNode->nextSibling();
             if (listChildNode && is<RenderListItem>(listChildNode->renderer()))
                 setNodeAttribute(clonedChild, startAttr, AtomString::number(downcast<RenderListItem>(*listChildNode->renderer()).value()));
         }

         appendNode(clonedChild.copyRef(), clonedAncestor.releaseNonNull());
         clonedAncestor = WTFMove(clonedChild);
     }

     moveRemainingSiblingsToNewParent(startNode, 0, *clonedAncestor);

     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.
         RefPtr<Element> ancestor;
         RefPtr<Element> clonedParent;
         for (ancestor = ancestors.first(), clonedParent = clonedAncestor->parentElement();
              ancestor && ancestor != topBlockquote;
              ancestor = ancestor->parentElement(), clonedParent = clonedParent->parentElement())
             moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, *clonedParent);

         // If the startNode's original parent is now empty, remove it
         Node* originalParent = ancestors.first().get();
         if (!originalParent->hasChildNodes())
             removeNode(*originalParent);
     }

     // Make sure the cloned block quote renders.
     addBlockPlaceholderIfNeeded(clonedBlockquote.ptr());

     // Put the selection right before the break.
     setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.ptr()), DOWNSTREAM, endingSelection().isDirectional()));
     rebalanceWhitespace();
 }

 } // namespace WebCore
	/*
	* Copyright (C) 2005 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 "BreakBlockquoteCommand.h"

	#include "Editing.h"
	#include "HTMLBRElement.h"
	#include "HTMLNames.h"
	#include "NodeTraversal.h"
	#include "RenderListItem.h"
	#include "Text.h"

	namespace WebCore {

	using namespace HTMLNames;

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

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

	// Delete the current selection.
	if (endingSelection().isRange())
	deleteSelection(false, false);

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

	ASSERT(!endingSelection().isNone());

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

	VisiblePosition visiblePos = endingSelection().visibleStart();

	// 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 = endingSelection().start().downstream();

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

	auto breakNode = 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 quoted content.
	if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) {
	insertNodeBefore(breakNode.copyRef(), *topBlockquote);
	setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.ptr()), DOWNSTREAM, endingSelection().isDirectional()));
	rebalanceWhitespace();
	return;
	}

	// Insert a break after the top blockquote.
	insertNodeAfter(breakNode.copyRef(), *topBlockquote);

	// If we're inserting the break at the end of the quoted content, we don't need to break the quote.
	if (isLastVisPosInNode) {
	setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.ptr()), 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 = pos.next();

	// Adjust the position so we don't split at the beginning of a quote.
	while (isFirstVisiblePositionInNode(VisiblePosition(pos), enclosingNodeOfType(pos, isMailBlockquote)))
	pos = pos.previous();

	// startNode is the first node that we need to move to the new blockquote.
	Node* startNode = pos.deprecatedNode();
	ASSERT(startNode);
	// Split at pos if in the middle of a text node.
	if (is<Text>(*startNode)) {
	Text& textNode = downcast<Text>(*startNode);
	if ((unsigned)pos.deprecatedEditingOffset() >= textNode.length()) {
	startNode = NodeTraversal::next(*startNode);
	ASSERT(startNode);
	} else if (pos.deprecatedEditingOffset() > 0)
	splitTextNode(textNode, pos.deprecatedEditingOffset());
	} else if (pos.deprecatedEditingOffset() > 0) {
	Node* childAtOffset = startNode->traverseToChildAt(pos.deprecatedEditingOffset());
	startNode = childAtOffset ? childAtOffset : NodeTraversal::next(*startNode);
	ASSERT(startNode);
	}

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

	// Build up list of ancestors in between the start node and the top blockquote.
	Vector<RefPtr<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.
	auto clonedBlockquote = downcast<Element>(*topBlockquote).cloneElementWithoutChildren(document());
	insertNodeAfter(clonedBlockquote.copyRef(), breakNode);

	// 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).
	RefPtr<Element> clonedAncestor = clonedBlockquote.copyRef();
	for (size_t i = ancestors.size(); i != 0; --i) {
	auto clonedChild = ancestors[i - 1]->cloneElementWithoutChildren(document());
	// Preserve list item numbering in cloned lists.
	if (clonedChild->isElementNode() && clonedChild->hasTagName(olTag)) {
	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 && !listChildNode->hasTagName(liTag))
	listChildNode = listChildNode->nextSibling();
	if (listChildNode && is<RenderListItem>(listChildNode->renderer()))
	setNodeAttribute(clonedChild, startAttr, AtomString::number(downcast<RenderListItem>(*listChildNode->renderer()).value()));
	}

	appendNode(clonedChild.copyRef(), clonedAncestor.releaseNonNull());
	clonedAncestor = WTFMove(clonedChild);
	}

	moveRemainingSiblingsToNewParent(startNode, 0, *clonedAncestor);

	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.
	RefPtr<Element> ancestor;
	RefPtr<Element> clonedParent;
	for (ancestor = ancestors.first(), clonedParent = clonedAncestor->parentElement();
	ancestor && ancestor != topBlockquote;
	ancestor = ancestor->parentElement(), clonedParent = clonedParent->parentElement())
	moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, *clonedParent);

	// If the startNode's original parent is now empty, remove it
	Node* originalParent = ancestors.first().get();
	if (!originalParent->hasChildNodes())
	removeNode(*originalParent);
	}

	// Make sure the cloned block quote renders.
	addBlockPlaceholderIfNeeded(clonedBlockquote.ptr());

	// Put the selection right before the break.
	setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.ptr()), DOWNSTREAM, endingSelection().isDirectional()));
	rebalanceWhitespace();
	}

	} // namespace WebCore