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27 #include "core/editing/InsertListCommand.h"
29 #include "HTMLNames.h"
30 #include "bindings/v8/ExceptionStatePlaceholder.h"
31 #include "core/dom/Element.h"
32 #include "core/editing/TextIterator.h"
33 #include "core/editing/VisibleUnits.h"
34 #include "core/editing/htmlediting.h"
35 #include "core/html/HTMLElement.h"
39 using namespace HTMLNames;
41 static Node* enclosingListChild(Node* node, Node* listNode)
43 Node* listChild = enclosingListChild(node);
44 while (listChild && enclosingList(listChild) != listNode)
45 listChild = enclosingListChild(listChild->parentNode());
49 PassRefPtr<HTMLElement> InsertListCommand::insertList(Document& document, Type type)
51 RefPtr<InsertListCommand> insertCommand = create(document, type);
52 insertCommand->apply();
53 return insertCommand->m_listElement;
56 HTMLElement* InsertListCommand::fixOrphanedListChild(Node* node)
58 RefPtr<HTMLElement> listElement = createUnorderedListElement(document());
59 insertNodeBefore(listElement, node);
61 appendNode(node, listElement);
62 m_listElement = listElement;
63 return listElement.get();
66 PassRefPtr<HTMLElement> InsertListCommand::mergeWithNeighboringLists(PassRefPtr<HTMLElement> passedList)
68 RefPtr<HTMLElement> list = passedList;
69 Element* previousList = list->previousElementSibling();
70 if (canMergeLists(previousList, list.get()))
71 mergeIdenticalElements(previousList, list);
73 if (!list || !list->nextElementSibling() || !list->nextElementSibling()->isHTMLElement())
74 return list.release();
76 RefPtr<HTMLElement> nextList = toHTMLElement(list->nextElementSibling());
77 if (canMergeLists(list.get(), nextList.get())) {
78 mergeIdenticalElements(list, nextList);
79 return nextList.release();
81 return list.release();
84 bool InsertListCommand::selectionHasListOfType(const VisibleSelection& selection, const QualifiedName& listTag)
86 VisiblePosition start = selection.visibleStart();
88 if (!enclosingList(start.deepEquivalent().deprecatedNode()))
91 VisiblePosition end = startOfParagraph(selection.visibleEnd());
92 while (start.isNotNull() && start != end) {
93 Element* listNode = enclosingList(start.deepEquivalent().deprecatedNode());
94 if (!listNode || !listNode->hasTagName(listTag))
96 start = startOfNextParagraph(start);
102 InsertListCommand::InsertListCommand(Document& document, Type type)
103 : CompositeEditCommand(document), m_type(type)
107 void InsertListCommand::doApply()
109 if (!endingSelection().isNonOrphanedCaretOrRange())
112 if (!endingSelection().rootEditableElement())
115 VisiblePosition visibleEnd = endingSelection().visibleEnd();
116 VisiblePosition visibleStart = endingSelection().visibleStart();
117 // When a selection ends at the start of a paragraph, we rarely paint
118 // the selection gap before that paragraph, because there often is no gap.
119 // In a case like this, it's not obvious to the user that the selection
120 // ends "inside" that paragraph, so it would be confusing if InsertUn{Ordered}List
121 // operated on that paragraph.
122 // FIXME: We paint the gap before some paragraphs that are indented with left
123 // margin/padding, but not others. We should make the gap painting more consistent and
124 // then use a left margin/padding rule here.
125 if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd, CanSkipOverEditingBoundary))
126 setEndingSelection(VisibleSelection(visibleStart, visibleEnd.previous(CannotCrossEditingBoundary), endingSelection().isDirectional()));
128 const QualifiedName& listTag = (m_type == OrderedList) ? olTag : ulTag;
129 if (endingSelection().isRange()) {
130 VisibleSelection selection = selectionForParagraphIteration(endingSelection());
131 ASSERT(selection.isRange());
132 VisiblePosition startOfSelection = selection.visibleStart();
133 VisiblePosition endOfSelection = selection.visibleEnd();
134 VisiblePosition startOfLastParagraph = startOfParagraph(endOfSelection, CanSkipOverEditingBoundary);
136 if (startOfParagraph(startOfSelection, CanSkipOverEditingBoundary) != startOfLastParagraph) {
137 bool forceCreateList = !selectionHasListOfType(selection, listTag);
139 RefPtr<Range> currentSelection = endingSelection().firstRange();
140 VisiblePosition startOfCurrentParagraph = startOfSelection;
141 while (!inSameParagraph(startOfCurrentParagraph, startOfLastParagraph, CanCrossEditingBoundary)) {
142 // doApply() may operate on and remove the last paragraph of the selection from the document
143 // if it's in the same list item as startOfCurrentParagraph. Return early to avoid an
144 // infinite loop and because there is no more work to be done.
145 // FIXME(<rdar://problem/5983974>): The endingSelection() may be incorrect here. Compute
146 // the new location of endOfSelection and use it as the end of the new selection.
147 if (!startOfLastParagraph.deepEquivalent().inDocument())
149 setEndingSelection(startOfCurrentParagraph);
151 // Save and restore endOfSelection and startOfLastParagraph when necessary
152 // since moveParagraph and movePragraphWithClones can remove nodes.
153 // FIXME: This is an inefficient way to keep selection alive because indexForVisiblePosition walks from
154 // the beginning of the document to the endOfSelection everytime this code is executed.
155 // But not using index is hard because there are so many ways we can lose selection inside doApplyForSingleParagraph.
156 RefPtr<ContainerNode> scope;
157 int indexForEndOfSelection = indexForVisiblePosition(endOfSelection, scope);
158 doApplyForSingleParagraph(forceCreateList, listTag, currentSelection.get());
159 if (endOfSelection.isNull() || endOfSelection.isOrphan() || startOfLastParagraph.isNull() || startOfLastParagraph.isOrphan()) {
160 endOfSelection = visiblePositionForIndex(indexForEndOfSelection, scope.get());
161 // If endOfSelection is null, then some contents have been deleted from the document.
162 // This should never happen and if it did, exit early immediately because we've lost the loop invariant.
163 ASSERT(endOfSelection.isNotNull());
164 if (endOfSelection.isNull())
166 startOfLastParagraph = startOfParagraph(endOfSelection, CanSkipOverEditingBoundary);
169 // Fetch the start of the selection after moving the first paragraph,
170 // because moving the paragraph will invalidate the original start.
171 // We'll use the new start to restore the original selection after
172 // we modified all selected paragraphs.
173 if (startOfCurrentParagraph == startOfSelection)
174 startOfSelection = endingSelection().visibleStart();
176 startOfCurrentParagraph = startOfNextParagraph(endingSelection().visibleStart());
178 setEndingSelection(endOfSelection);
179 doApplyForSingleParagraph(forceCreateList, listTag, currentSelection.get());
180 // Fetch the end of the selection, for the reason mentioned above.
181 endOfSelection = endingSelection().visibleEnd();
182 setEndingSelection(VisibleSelection(startOfSelection, endOfSelection, endingSelection().isDirectional()));
187 doApplyForSingleParagraph(false, listTag, endingSelection().firstRange().get());
190 void InsertListCommand::doApplyForSingleParagraph(bool forceCreateList, const QualifiedName& listTag, Range* currentSelection)
192 // FIXME: This will produce unexpected results for a selection that starts just before a
193 // table and ends inside the first cell, selectionForParagraphIteration should probably
194 // be renamed and deployed inside setEndingSelection().
195 Node* selectionNode = endingSelection().start().deprecatedNode();
196 Node* listChildNode = enclosingListChild(selectionNode);
197 bool switchListType = false;
199 // Remove the list chlild.
200 RefPtr<HTMLElement> listNode = enclosingList(listChildNode);
202 listNode = fixOrphanedListChild(listChildNode);
203 listNode = mergeWithNeighboringLists(listNode);
205 if (!listNode->hasTagName(listTag))
206 // listChildNode will be removed from the list and a list of type m_type will be created.
207 switchListType = true;
209 // If the list is of the desired type, and we are not removing the list, then exit early.
210 if (!switchListType && forceCreateList)
213 // If the entire list is selected, then convert the whole list.
214 if (switchListType && isNodeVisiblyContainedWithin(listNode.get(), currentSelection)) {
215 bool rangeStartIsInList = visiblePositionBeforeNode(listNode.get()) == currentSelection->startPosition();
216 bool rangeEndIsInList = visiblePositionAfterNode(listNode.get()) == currentSelection->endPosition();
218 RefPtr<HTMLElement> newList = createHTMLElement(document(), listTag);
219 insertNodeBefore(newList, listNode);
221 Node* firstChildInList = enclosingListChild(VisiblePosition(firstPositionInNode(listNode.get())).deepEquivalent().deprecatedNode(), listNode.get());
222 Node* outerBlock = firstChildInList->isBlockFlowElement() ? firstChildInList : listNode.get();
224 moveParagraphWithClones(firstPositionInNode(listNode.get()), lastPositionInNode(listNode.get()), newList.get(), outerBlock);
226 // Manually remove listNode because moveParagraphWithClones sometimes leaves it behind in the document.
227 // See the bug 33668 and editing/execCommand/insert-list-orphaned-item-with-nested-lists.html.
228 // FIXME: This might be a bug in moveParagraphWithClones or deleteSelection.
229 if (listNode && listNode->inDocument())
230 removeNode(listNode);
232 newList = mergeWithNeighboringLists(newList);
234 // Restore the start and the end of current selection if they started inside listNode
235 // because moveParagraphWithClones could have removed them.
236 if (rangeStartIsInList && newList)
237 currentSelection->setStart(newList, 0, IGNORE_EXCEPTION);
238 if (rangeEndIsInList && newList)
239 currentSelection->setEnd(newList, lastOffsetInNode(newList.get()), IGNORE_EXCEPTION);
241 setEndingSelection(VisiblePosition(firstPositionInNode(newList.get())));
246 unlistifyParagraph(endingSelection().visibleStart(), listNode.get(), listChildNode);
249 if (!listChildNode || switchListType || forceCreateList)
250 m_listElement = listifyParagraph(endingSelection().visibleStart(), listTag);
253 void InsertListCommand::unlistifyParagraph(const VisiblePosition& originalStart, HTMLElement* listNode, Node* listChildNode)
256 Node* previousListChild;
257 VisiblePosition start;
259 if (listChildNode->hasTagName(liTag)) {
260 start = firstPositionInNode(listChildNode);
261 end = lastPositionInNode(listChildNode);
262 nextListChild = listChildNode->nextSibling();
263 previousListChild = listChildNode->previousSibling();
265 // A paragraph is visually a list item minus a list marker. The paragraph will be moved.
266 start = startOfParagraph(originalStart, CanSkipOverEditingBoundary);
267 end = endOfParagraph(start, CanSkipOverEditingBoundary);
268 nextListChild = enclosingListChild(end.next().deepEquivalent().deprecatedNode(), listNode);
269 ASSERT(nextListChild != listChildNode);
270 previousListChild = enclosingListChild(start.previous().deepEquivalent().deprecatedNode(), listNode);
271 ASSERT(previousListChild != listChildNode);
273 // When removing a list, we must always create a placeholder to act as a point of insertion
274 // for the list content being removed.
275 RefPtr<Element> placeholder = createBreakElement(document());
276 RefPtr<Element> nodeToInsert = placeholder;
277 // If the content of the list item will be moved into another list, put it in a list item
278 // so that we don't create an orphaned list child.
279 if (enclosingList(listNode)) {
280 nodeToInsert = createListItemElement(document());
281 appendNode(placeholder, nodeToInsert);
284 if (nextListChild && previousListChild) {
285 // We want to pull listChildNode out of listNode, and place it before nextListChild
286 // and after previousListChild, so we split listNode and insert it between the two lists.
287 // But to split listNode, we must first split ancestors of listChildNode between it and listNode,
289 // FIXME: We appear to split at nextListChild as opposed to listChildNode so that when we remove
290 // listChildNode below in moveParagraphs, previousListChild will be removed along with it if it is
291 // unrendered. But we ought to remove nextListChild too, if it is unrendered.
292 splitElement(listNode, splitTreeToNode(nextListChild, listNode));
293 insertNodeBefore(nodeToInsert, listNode);
294 } else if (nextListChild || listChildNode->parentNode() != listNode) {
295 // Just because listChildNode has no previousListChild doesn't mean there isn't any content
296 // in listNode that comes before listChildNode, as listChildNode could have ancestors
297 // between it and listNode. So, we split up to listNode before inserting the placeholder
298 // where we're about to move listChildNode to.
299 if (listChildNode->parentNode() != listNode)
300 splitElement(listNode, splitTreeToNode(listChildNode, listNode).get());
301 insertNodeBefore(nodeToInsert, listNode);
303 insertNodeAfter(nodeToInsert, listNode);
305 VisiblePosition insertionPoint = VisiblePosition(positionBeforeNode(placeholder.get()));
306 moveParagraphs(start, end, insertionPoint, /* preserveSelection */ true, /* preserveStyle */ true, listChildNode);
309 static Element* adjacentEnclosingList(const VisiblePosition& pos, const VisiblePosition& adjacentPos, const QualifiedName& listTag)
311 Element* listNode = outermostEnclosingList(adjacentPos.deepEquivalent().deprecatedNode());
316 Node* previousCell = enclosingTableCell(pos.deepEquivalent());
317 Node* currentCell = enclosingTableCell(adjacentPos.deepEquivalent());
319 if (!listNode->hasTagName(listTag)
320 || listNode->contains(pos.deepEquivalent().deprecatedNode())
321 || previousCell != currentCell
322 || enclosingList(listNode) != enclosingList(pos.deepEquivalent().deprecatedNode()))
328 PassRefPtr<HTMLElement> InsertListCommand::listifyParagraph(const VisiblePosition& originalStart, const QualifiedName& listTag)
330 VisiblePosition start = startOfParagraph(originalStart, CanSkipOverEditingBoundary);
331 VisiblePosition end = endOfParagraph(start, CanSkipOverEditingBoundary);
333 if (start.isNull() || end.isNull())
336 // Check for adjoining lists.
337 RefPtr<HTMLElement> listItemElement = createListItemElement(document());
338 RefPtr<HTMLElement> placeholder = createBreakElement(document());
339 appendNode(placeholder, listItemElement);
341 // Place list item into adjoining lists.
342 Element* previousList = adjacentEnclosingList(start.deepEquivalent(), start.previous(CannotCrossEditingBoundary), listTag);
343 Element* nextList = adjacentEnclosingList(start.deepEquivalent(), end.next(CannotCrossEditingBoundary), listTag);
344 RefPtr<HTMLElement> listElement;
346 appendNode(listItemElement, previousList);
348 insertNodeAt(listItemElement, positionBeforeNode(nextList));
351 listElement = createHTMLElement(document(), listTag);
352 appendNode(listItemElement, listElement);
354 if (start == end && isBlock(start.deepEquivalent().deprecatedNode())) {
355 // Inserting the list into an empty paragraph that isn't held open
356 // by a br or a '\n', will invalidate start and end. Insert
357 // a placeholder and then recompute start and end.
358 RefPtr<Node> placeholder = insertBlockPlaceholder(start.deepEquivalent());
359 start = positionBeforeNode(placeholder.get());
363 // Insert the list at a position visually equivalent to start of the
364 // paragraph that is being moved into the list.
365 // Try to avoid inserting it somewhere where it will be surrounded by
366 // inline ancestors of start, since it is easier for editing to produce
367 // clean markup when inline elements are pushed down as far as possible.
368 Position insertionPos(start.deepEquivalent().upstream());
369 // Also avoid the containing list item.
370 Node* listChild = enclosingListChild(insertionPos.deprecatedNode());
371 if (listChild && listChild->hasTagName(liTag))
372 insertionPos = positionInParentBeforeNode(listChild);
374 insertNodeAt(listElement, insertionPos);
376 // We inserted the list at the start of the content we're about to move
377 // Update the start of content, so we don't try to move the list into itself. bug 19066
378 // Layout is necessary since start's node's inline renderers may have been destroyed by the insertion
379 // The end of the content may have changed after the insertion and layout so update it as well.
380 if (insertionPos == start.deepEquivalent()) {
381 listElement->document().updateLayoutIgnorePendingStylesheets();
382 start = startOfParagraph(originalStart, CanSkipOverEditingBoundary);
383 end = endOfParagraph(start, CanSkipOverEditingBoundary);
387 moveParagraph(start, end, positionBeforeNode(placeholder.get()), true);
390 return mergeWithNeighboringLists(listElement);
392 if (canMergeLists(previousList, nextList))
393 mergeIdenticalElements(previousList, nextList);