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27 #include "core/editing/InsertParagraphSeparatorCommand.h"
29 #include "HTMLNames.h"
30 #include "core/dom/Document.h"
31 #include "core/dom/NodeTraversal.h"
32 #include "core/dom/Text.h"
33 #include "core/editing/EditingStyle.h"
34 #include "core/editing/InsertLineBreakCommand.h"
35 #include "core/editing/VisibleUnits.h"
36 #include "core/editing/htmlediting.h"
37 #include "core/html/HTMLElement.h"
38 #include "core/rendering/RenderObject.h"
42 using namespace HTMLNames;
44 // When inserting a new line, we want to avoid nesting empty divs if we can. Otherwise, when
45 // pasting, it's easy to have each new line be a div deeper than the previous. E.g., in the case
46 // below, we want to insert at ^ instead of |.
47 // <div>foo<div>bar</div>|</div>^
48 static Element* highestVisuallyEquivalentDivBelowRoot(Element* startBlock)
50 Element* curBlock = startBlock;
51 // We don't want to return a root node (if it happens to be a div, e.g., in a document fragment) because there are no
52 // siblings for us to append to.
53 while (!curBlock->nextSibling() && curBlock->parentElement()->hasTagName(divTag) && curBlock->parentElement()->parentElement()) {
54 if (curBlock->parentElement()->hasAttributes())
56 curBlock = curBlock->parentElement();
61 InsertParagraphSeparatorCommand::InsertParagraphSeparatorCommand(Document& document, bool mustUseDefaultParagraphElement, bool pasteBlockqutoeIntoUnquotedArea)
62 : CompositeEditCommand(document)
63 , m_mustUseDefaultParagraphElement(mustUseDefaultParagraphElement)
64 , m_pasteBlockqutoeIntoUnquotedArea(pasteBlockqutoeIntoUnquotedArea)
68 bool InsertParagraphSeparatorCommand::preservesTypingStyle() const
73 void InsertParagraphSeparatorCommand::calculateStyleBeforeInsertion(const Position &pos)
75 // It is only important to set a style to apply later if we're at the boundaries of
76 // a paragraph. Otherwise, content that is moved as part of the work of the command
77 // will lend their styles to the new paragraph without any extra work needed.
78 VisiblePosition visiblePos(pos, VP_DEFAULT_AFFINITY);
79 if (!isStartOfParagraph(visiblePos) && !isEndOfParagraph(visiblePos))
82 ASSERT(pos.isNotNull());
83 m_style = EditingStyle::create(pos);
84 m_style->mergeTypingStyle(pos.document());
87 void InsertParagraphSeparatorCommand::applyStyleAfterInsertion(Node* originalEnclosingBlock)
89 // Not only do we break out of header tags, but we also do not preserve the typing style,
90 // in order to match other browsers.
91 if (originalEnclosingBlock->hasTagName(h1Tag) ||
92 originalEnclosingBlock->hasTagName(h2Tag) ||
93 originalEnclosingBlock->hasTagName(h3Tag) ||
94 originalEnclosingBlock->hasTagName(h4Tag) ||
95 originalEnclosingBlock->hasTagName(h5Tag))
101 m_style->prepareToApplyAt(endingSelection().start());
102 if (!m_style->isEmpty())
103 applyStyle(m_style.get());
106 bool InsertParagraphSeparatorCommand::shouldUseDefaultParagraphElement(Node* enclosingBlock) const
108 if (m_mustUseDefaultParagraphElement)
111 // Assumes that if there was a range selection, it was already deleted.
112 if (!isEndOfBlock(endingSelection().visibleStart()))
115 return enclosingBlock->hasTagName(h1Tag) ||
116 enclosingBlock->hasTagName(h2Tag) ||
117 enclosingBlock->hasTagName(h3Tag) ||
118 enclosingBlock->hasTagName(h4Tag) ||
119 enclosingBlock->hasTagName(h5Tag);
122 void InsertParagraphSeparatorCommand::getAncestorsInsideBlock(const Node* insertionNode, Element* outerBlock, Vector<RefPtr<Element> >& ancestors)
126 // Build up list of ancestors elements between the insertion node and the outer block.
127 if (insertionNode != outerBlock) {
128 for (Element* n = insertionNode->parentElement(); n && n != outerBlock; n = n->parentElement())
133 PassRefPtr<Element> InsertParagraphSeparatorCommand::cloneHierarchyUnderNewBlock(const Vector<RefPtr<Element> >& ancestors, PassRefPtr<Element> blockToInsert)
135 // Make clones of ancestors in between the start node and the start block.
136 RefPtr<Element> parent = blockToInsert;
137 for (size_t i = ancestors.size(); i != 0; --i) {
138 RefPtr<Element> child = ancestors[i - 1]->cloneElementWithoutChildren();
139 // It should always be okay to remove id from the cloned elements, since the originals are not deleted.
140 child->removeAttribute(idAttr);
141 appendNode(child, parent);
142 parent = child.release();
145 return parent.release();
148 void InsertParagraphSeparatorCommand::doApply()
150 if (!endingSelection().isNonOrphanedCaretOrRange())
153 Position insertionPosition = endingSelection().start();
155 EAffinity affinity = endingSelection().affinity();
157 // Delete the current selection.
158 if (endingSelection().isRange()) {
159 calculateStyleBeforeInsertion(insertionPosition);
160 deleteSelection(false, true);
161 insertionPosition = endingSelection().start();
162 affinity = endingSelection().affinity();
165 // FIXME: The parentAnchoredEquivalent conversion needs to be moved into enclosingBlock.
166 RefPtr<Element> startBlock = enclosingBlock(insertionPosition.parentAnchoredEquivalent().containerNode());
167 Node* listChildNode = enclosingListChild(insertionPosition.parentAnchoredEquivalent().containerNode());
168 RefPtr<Element> listChild = listChildNode && listChildNode->isHTMLElement() ? toHTMLElement(listChildNode) : 0;
169 Position canonicalPos = VisiblePosition(insertionPosition).deepEquivalent();
171 || !startBlock->nonShadowBoundaryParentNode()
172 || isTableCell(startBlock.get())
173 || startBlock->hasTagName(formTag)
174 // FIXME: If the node is hidden, we don't have a canonical position so we will do the wrong thing for tables and <hr>. https://bugs.webkit.org/show_bug.cgi?id=40342
175 || (!canonicalPos.isNull() && canonicalPos.deprecatedNode()->renderer() && canonicalPos.deprecatedNode()->renderer()->isTable())
176 || (!canonicalPos.isNull() && canonicalPos.deprecatedNode()->hasTagName(hrTag))) {
177 applyCommandToComposite(InsertLineBreakCommand::create(document()));
181 // Use the leftmost candidate.
182 insertionPosition = insertionPosition.upstream();
183 if (!insertionPosition.isCandidate())
184 insertionPosition = insertionPosition.downstream();
186 // Adjust the insertion position after the delete
187 insertionPosition = positionAvoidingSpecialElementBoundary(insertionPosition);
188 VisiblePosition visiblePos(insertionPosition, affinity);
189 calculateStyleBeforeInsertion(insertionPosition);
191 //---------------------------------------------------------------------
192 // Handle special case of typing return on an empty list item
193 if (breakOutOfEmptyListItem())
196 //---------------------------------------------------------------------
197 // Prepare for more general cases.
199 bool isFirstInBlock = isStartOfBlock(visiblePos);
200 bool isLastInBlock = isEndOfBlock(visiblePos);
201 bool nestNewBlock = false;
203 // Create block to be inserted.
204 RefPtr<Element> blockToInsert;
205 if (startBlock->isRootEditableElement()) {
206 blockToInsert = createDefaultParagraphElement(document());
208 } else if (shouldUseDefaultParagraphElement(startBlock.get())) {
209 blockToInsert = createDefaultParagraphElement(document());
211 blockToInsert = startBlock->cloneElementWithoutChildren();
214 //---------------------------------------------------------------------
215 // Handle case when position is in the last visible position in its block,
216 // including when the block is empty.
219 if (isFirstInBlock && !lineBreakExistsAtVisiblePosition(visiblePos)) {
220 // The block is empty. Create an empty block to
221 // represent the paragraph that we're leaving.
222 RefPtr<Element> extraBlock = createDefaultParagraphElement(document());
223 appendNode(extraBlock, startBlock);
224 appendBlockPlaceholder(extraBlock);
226 appendNode(blockToInsert, startBlock);
228 // We can get here if we pasted a copied portion of a blockquote with a newline at the end and are trying to paste it
229 // into an unquoted area. We then don't want the newline within the blockquote or else it will also be quoted.
230 if (m_pasteBlockqutoeIntoUnquotedArea) {
231 if (Node* highestBlockquote = highestEnclosingNodeOfType(canonicalPos, &isMailBlockquote))
232 startBlock = toElement(highestBlockquote);
235 if (listChild && listChild != startBlock) {
236 RefPtr<Element> listChildToInsert = listChild->cloneElementWithoutChildren();
237 appendNode(blockToInsert, listChildToInsert.get());
238 insertNodeAfter(listChildToInsert.get(), listChild);
240 // Most of the time we want to stay at the nesting level of the startBlock (e.g., when nesting within lists). However,
241 // for div nodes, this can result in nested div tags that are hard to break out of.
242 Element* siblingNode = startBlock.get();
243 if (blockToInsert->hasTagName(divTag))
244 siblingNode = highestVisuallyEquivalentDivBelowRoot(startBlock.get());
245 insertNodeAfter(blockToInsert, siblingNode);
249 // Recreate the same structure in the new paragraph.
251 Vector<RefPtr<Element> > ancestors;
252 getAncestorsInsideBlock(positionOutsideTabSpan(insertionPosition).deprecatedNode(), startBlock.get(), ancestors);
253 RefPtr<Element> parent = cloneHierarchyUnderNewBlock(ancestors, blockToInsert);
255 appendBlockPlaceholder(parent);
257 setEndingSelection(VisibleSelection(firstPositionInNode(parent.get()), DOWNSTREAM, endingSelection().isDirectional()));
262 //---------------------------------------------------------------------
263 // Handle case when position is in the first visible position in its block, and
264 // similar case where previous position is in another, presumeably nested, block.
265 if (isFirstInBlock || !inSameBlock(visiblePos, visiblePos.previous())) {
267 insertionPosition = positionOutsideTabSpan(insertionPosition);
269 if (isFirstInBlock && !nestNewBlock) {
270 if (listChild && listChild != startBlock) {
271 RefPtr<Element> listChildToInsert = listChild->cloneElementWithoutChildren();
272 appendNode(blockToInsert, listChildToInsert.get());
273 insertNodeBefore(listChildToInsert.get(), listChild);
275 refNode = startBlock.get();
277 } else if (isFirstInBlock && nestNewBlock) {
278 // startBlock should always have children, otherwise isLastInBlock would be true and it's handled above.
279 ASSERT(startBlock->firstChild());
280 refNode = startBlock->firstChild();
282 else if (insertionPosition.deprecatedNode() == startBlock && nestNewBlock) {
283 refNode = startBlock->childNode(insertionPosition.deprecatedEditingOffset());
284 ASSERT(refNode); // must be true or we'd be in the end of block case
286 refNode = insertionPosition.deprecatedNode();
288 // find ending selection position easily before inserting the paragraph
289 insertionPosition = insertionPosition.downstream();
292 insertNodeBefore(blockToInsert, refNode);
294 // Recreate the same structure in the new paragraph.
296 Vector<RefPtr<Element> > ancestors;
297 getAncestorsInsideBlock(positionAvoidingSpecialElementBoundary(positionOutsideTabSpan(insertionPosition)).deprecatedNode(), startBlock.get(), ancestors);
299 appendBlockPlaceholder(cloneHierarchyUnderNewBlock(ancestors, blockToInsert));
301 // In this case, we need to set the new ending selection.
302 setEndingSelection(VisibleSelection(insertionPosition, DOWNSTREAM, endingSelection().isDirectional()));
306 //---------------------------------------------------------------------
307 // Handle the (more complicated) general case,
309 // All of the content in the current block after visiblePos is
310 // about to be wrapped in a new paragraph element. Add a br before
311 // it if visiblePos is at the start of a paragraph so that the
312 // content will move down a line.
313 if (isStartOfParagraph(visiblePos)) {
314 RefPtr<Element> br = createBreakElement(document());
315 insertNodeAt(br.get(), insertionPosition);
316 insertionPosition = positionInParentAfterNode(br.get());
317 // If the insertion point is a break element, there is nothing else
319 if (visiblePos.deepEquivalent().anchorNode()->renderer()->isBR()) {
320 setEndingSelection(VisibleSelection(insertionPosition, DOWNSTREAM, endingSelection().isDirectional()));
325 // Move downstream. Typing style code will take care of carrying along the
326 // style of the upstream position.
327 insertionPosition = insertionPosition.downstream();
329 // At this point, the insertionPosition's node could be a container, and we want to make sure we include
330 // all of the correct nodes when building the ancestor list. So this needs to be the deepest representation of the position
331 // before we walk the DOM tree.
332 insertionPosition = positionOutsideTabSpan(VisiblePosition(insertionPosition).deepEquivalent());
334 // If the returned position lies either at the end or at the start of an element that is ignored by editing
335 // we should move to its upstream or downstream position.
336 if (editingIgnoresContent(insertionPosition.deprecatedNode())) {
337 if (insertionPosition.atLastEditingPositionForNode())
338 insertionPosition = insertionPosition.downstream();
339 else if (insertionPosition.atFirstEditingPositionForNode())
340 insertionPosition = insertionPosition.upstream();
343 // Make sure we do not cause a rendered space to become unrendered.
344 // FIXME: We need the affinity for pos, but pos.downstream() does not give it
345 Position leadingWhitespace = insertionPosition.leadingWhitespacePosition(VP_DEFAULT_AFFINITY);
346 // FIXME: leadingWhitespacePosition is returning the position before preserved newlines for positions
347 // after the preserved newline, causing the newline to be turned into a nbsp.
348 if (leadingWhitespace.isNotNull() && leadingWhitespace.deprecatedNode()->isTextNode()) {
349 Text* textNode = toText(leadingWhitespace.deprecatedNode());
350 ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
351 replaceTextInNodePreservingMarkers(textNode, leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
354 // Split at pos if in the middle of a text node.
355 Position positionAfterSplit;
356 if (insertionPosition.anchorType() == Position::PositionIsOffsetInAnchor && insertionPosition.containerNode()->isTextNode()) {
357 RefPtr<Text> textNode = toText(insertionPosition.containerNode());
358 bool atEnd = static_cast<unsigned>(insertionPosition.offsetInContainerNode()) >= textNode->length();
359 if (insertionPosition.deprecatedEditingOffset() > 0 && !atEnd) {
360 splitTextNode(textNode, insertionPosition.offsetInContainerNode());
361 positionAfterSplit = firstPositionInNode(textNode.get());
362 insertionPosition.moveToPosition(textNode->previousSibling(), insertionPosition.offsetInContainerNode());
363 visiblePos = VisiblePosition(insertionPosition);
367 // If we got detached due to mutation events, just bail out.
368 if (!startBlock->parentNode())
371 // Put the added block in the tree.
373 appendNode(blockToInsert.get(), startBlock);
374 } else if (listChild && listChild != startBlock) {
375 RefPtr<Element> listChildToInsert = listChild->cloneElementWithoutChildren();
376 appendNode(blockToInsert.get(), listChildToInsert.get());
377 insertNodeAfter(listChildToInsert.get(), listChild);
379 insertNodeAfter(blockToInsert.get(), startBlock);
382 document().updateLayoutIgnorePendingStylesheets();
384 // If the paragraph separator was inserted at the end of a paragraph, an empty line must be
385 // created. All of the nodes, starting at visiblePos, are about to be added to the new paragraph
386 // element. If the first node to be inserted won't be one that will hold an empty line open, add a br.
387 if (isEndOfParagraph(visiblePos) && !lineBreakExistsAtVisiblePosition(visiblePos))
388 appendNode(createBreakElement(document()).get(), blockToInsert.get());
390 // Move the start node and the siblings of the start node.
391 if (VisiblePosition(insertionPosition) != VisiblePosition(positionBeforeNode(blockToInsert.get()))) {
393 if (insertionPosition.containerNode() == startBlock)
394 n = insertionPosition.computeNodeAfterPosition();
396 Node* splitTo = insertionPosition.containerNode();
397 if (splitTo->isTextNode() && insertionPosition.offsetInContainerNode() >= caretMaxOffset(splitTo))
398 splitTo = NodeTraversal::next(splitTo, startBlock.get());
400 splitTreeToNode(splitTo, startBlock.get());
402 for (n = startBlock->firstChild(); n; n = n->nextSibling()) {
403 VisiblePosition beforeNodePosition = positionBeforeNode(n);
404 if (!beforeNodePosition.isNull() && comparePositions(VisiblePosition(insertionPosition), beforeNodePosition) <= 0)
409 moveRemainingSiblingsToNewParent(n, blockToInsert.get(), blockToInsert);
412 // Handle whitespace that occurs after the split
413 if (positionAfterSplit.isNotNull()) {
414 document().updateLayoutIgnorePendingStylesheets();
415 if (!positionAfterSplit.isRenderedCharacter()) {
416 // Clear out all whitespace and insert one non-breaking space
417 ASSERT(!positionAfterSplit.containerNode()->renderer() || positionAfterSplit.containerNode()->renderer()->style()->collapseWhiteSpace());
418 deleteInsignificantTextDownstream(positionAfterSplit);
419 if (positionAfterSplit.deprecatedNode()->isTextNode())
420 insertTextIntoNode(toText(positionAfterSplit.containerNode()), 0, nonBreakingSpaceString());
424 setEndingSelection(VisibleSelection(firstPositionInNode(blockToInsert.get()), DOWNSTREAM, endingSelection().isDirectional()));
425 applyStyleAfterInsertion(startBlock.get());
428 } // namespace WebCore