1 /* 2 * Copyright (C) 2005 Apple Computer, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "core/editing/DeleteSelectionCommand.h" 28 29 #include "HTMLNames.h" 30 #include "core/dom/Document.h" 31 #include "core/dom/Element.h" 32 #include "core/dom/NodeTraversal.h" 33 #include "core/dom/Text.h" 34 #include "core/editing/EditingBoundary.h" 35 #include "core/editing/Editor.h" 36 #include "core/editing/VisibleUnits.h" 37 #include "core/editing/htmlediting.h" 38 #include "core/html/HTMLInputElement.h" 39 #include "core/html/HTMLTableElement.h" 40 #include "core/frame/Frame.h" 41 #include "core/rendering/RenderTableCell.h" 42 43 namespace WebCore { 44 45 using namespace HTMLNames; 46 47 static bool isTableRow(const Node* node) 48 { 49 return node && node->hasTagName(trTag); 50 } 51 52 static bool isTableCellEmpty(Node* cell) 53 { 54 ASSERT(isTableCell(cell)); 55 return VisiblePosition(firstPositionInNode(cell)) == VisiblePosition(lastPositionInNode(cell)); 56 } 57 58 static bool isTableRowEmpty(Node* row) 59 { 60 if (!isTableRow(row)) 61 return false; 62 63 for (Node* child = row->firstChild(); child; child = child->nextSibling()) 64 if (isTableCell(child) && !isTableCellEmpty(child)) 65 return false; 66 67 return true; 68 } 69 70 DeleteSelectionCommand::DeleteSelectionCommand(Document& document, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup) 71 : CompositeEditCommand(document) 72 , m_hasSelectionToDelete(false) 73 , m_smartDelete(smartDelete) 74 , m_mergeBlocksAfterDelete(mergeBlocksAfterDelete) 75 , m_needPlaceholder(false) 76 , m_replace(replace) 77 , m_expandForSpecialElements(expandForSpecialElements) 78 , m_pruneStartBlockIfNecessary(false) 79 , m_startsAtEmptyLine(false) 80 , m_sanitizeMarkup(sanitizeMarkup) 81 , m_startBlock(0) 82 , m_endBlock(0) 83 , m_typingStyle(0) 84 , m_deleteIntoBlockquoteStyle(0) 85 { 86 } 87 88 DeleteSelectionCommand::DeleteSelectionCommand(const VisibleSelection& selection, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup) 89 : CompositeEditCommand(*selection.start().document()) 90 , m_hasSelectionToDelete(true) 91 , m_smartDelete(smartDelete) 92 , m_mergeBlocksAfterDelete(mergeBlocksAfterDelete) 93 , m_needPlaceholder(false) 94 , m_replace(replace) 95 , m_expandForSpecialElements(expandForSpecialElements) 96 , m_pruneStartBlockIfNecessary(false) 97 , m_startsAtEmptyLine(false) 98 , m_sanitizeMarkup(sanitizeMarkup) 99 , m_selectionToDelete(selection) 100 , m_startBlock(0) 101 , m_endBlock(0) 102 , m_typingStyle(0) 103 , m_deleteIntoBlockquoteStyle(0) 104 { 105 } 106 107 void DeleteSelectionCommand::initializeStartEnd(Position& start, Position& end) 108 { 109 Node* startSpecialContainer = 0; 110 Node* endSpecialContainer = 0; 111 112 start = m_selectionToDelete.start(); 113 end = m_selectionToDelete.end(); 114 115 // For HRs, we'll get a position at (HR,1) when hitting delete from the beginning of the previous line, or (HR,0) when forward deleting, 116 // but in these cases, we want to delete it, so manually expand the selection 117 if (start.deprecatedNode()->hasTagName(hrTag)) 118 start = positionBeforeNode(start.deprecatedNode()); 119 else if (end.deprecatedNode()->hasTagName(hrTag)) 120 end = positionAfterNode(end.deprecatedNode()); 121 122 // FIXME: This is only used so that moveParagraphs can avoid the bugs in special element expansion. 123 if (!m_expandForSpecialElements) 124 return; 125 126 while (1) { 127 startSpecialContainer = 0; 128 endSpecialContainer = 0; 129 130 Position s = positionBeforeContainingSpecialElement(start, &startSpecialContainer); 131 Position e = positionAfterContainingSpecialElement(end, &endSpecialContainer); 132 133 if (!startSpecialContainer && !endSpecialContainer) 134 break; 135 136 if (VisiblePosition(start) != m_selectionToDelete.visibleStart() || VisiblePosition(end) != m_selectionToDelete.visibleEnd()) 137 break; 138 139 // If we're going to expand to include the startSpecialContainer, it must be fully selected. 140 if (startSpecialContainer && !endSpecialContainer && comparePositions(positionInParentAfterNode(startSpecialContainer), end) > -1) 141 break; 142 143 // If we're going to expand to include the endSpecialContainer, it must be fully selected. 144 if (endSpecialContainer && !startSpecialContainer && comparePositions(start, positionInParentBeforeNode(endSpecialContainer)) > -1) 145 break; 146 147 if (startSpecialContainer && startSpecialContainer->isDescendantOf(endSpecialContainer)) 148 // Don't adjust the end yet, it is the end of a special element that contains the start 149 // special element (which may or may not be fully selected). 150 start = s; 151 else if (endSpecialContainer && endSpecialContainer->isDescendantOf(startSpecialContainer)) 152 // Don't adjust the start yet, it is the start of a special element that contains the end 153 // special element (which may or may not be fully selected). 154 end = e; 155 else { 156 start = s; 157 end = e; 158 } 159 } 160 } 161 162 void DeleteSelectionCommand::setStartingSelectionOnSmartDelete(const Position& start, const Position& end) 163 { 164 VisiblePosition newBase; 165 VisiblePosition newExtent; 166 if (startingSelection().isBaseFirst()) { 167 newBase = start; 168 newExtent = end; 169 } else { 170 newBase = end; 171 newExtent = start; 172 } 173 setStartingSelection(VisibleSelection(newBase, newExtent, startingSelection().isDirectional())); 174 } 175 176 void DeleteSelectionCommand::initializePositionData() 177 { 178 Position start, end; 179 initializeStartEnd(start, end); 180 181 m_upstreamStart = start.upstream(); 182 m_downstreamStart = start.downstream(); 183 m_upstreamEnd = end.upstream(); 184 m_downstreamEnd = end.downstream(); 185 186 m_startRoot = editableRootForPosition(start); 187 m_endRoot = editableRootForPosition(end); 188 189 m_startTableRow = enclosingNodeOfType(start, &isTableRow); 190 m_endTableRow = enclosingNodeOfType(end, &isTableRow); 191 192 // Don't move content out of a table cell. 193 // If the cell is non-editable, enclosingNodeOfType won't return it by default, so 194 // tell that function that we don't care if it returns non-editable nodes. 195 Node* startCell = enclosingNodeOfType(m_upstreamStart, &isTableCell, CanCrossEditingBoundary); 196 Node* endCell = enclosingNodeOfType(m_downstreamEnd, &isTableCell, CanCrossEditingBoundary); 197 // FIXME: This isn't right. A borderless table with two rows and a single column would appear as two paragraphs. 198 if (endCell && endCell != startCell) 199 m_mergeBlocksAfterDelete = false; 200 201 // Usually the start and the end of the selection to delete are pulled together as a result of the deletion. 202 // Sometimes they aren't (like when no merge is requested), so we must choose one position to hold the caret 203 // and receive the placeholder after deletion. 204 VisiblePosition visibleEnd(m_downstreamEnd); 205 if (m_mergeBlocksAfterDelete && !isEndOfParagraph(visibleEnd)) 206 m_endingPosition = m_downstreamEnd; 207 else 208 m_endingPosition = m_downstreamStart; 209 210 // We don't want to merge into a block if it will mean changing the quote level of content after deleting 211 // selections that contain a whole number paragraphs plus a line break, since it is unclear to most users 212 // that such a selection actually ends at the start of the next paragraph. This matches TextEdit behavior 213 // for indented paragraphs. 214 // Only apply this rule if the endingSelection is a range selection. If it is a caret, then other operations have created 215 // the selection we're deleting (like the process of creating a selection to delete during a backspace), and the user isn't in the situation described above. 216 if (numEnclosingMailBlockquotes(start) != numEnclosingMailBlockquotes(end) 217 && isStartOfParagraph(visibleEnd) && isStartOfParagraph(VisiblePosition(start)) 218 && endingSelection().isRange()) { 219 m_mergeBlocksAfterDelete = false; 220 m_pruneStartBlockIfNecessary = true; 221 } 222 223 // Handle leading and trailing whitespace, as well as smart delete adjustments to the selection 224 m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity()); 225 m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY); 226 227 if (m_smartDelete) { 228 229 // skip smart delete if the selection to delete already starts or ends with whitespace 230 Position pos = VisiblePosition(m_upstreamStart, m_selectionToDelete.affinity()).deepEquivalent(); 231 bool skipSmartDelete = pos.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull(); 232 if (!skipSmartDelete) 233 skipSmartDelete = m_downstreamEnd.leadingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull(); 234 235 // extend selection upstream if there is whitespace there 236 bool hasLeadingWhitespaceBeforeAdjustment = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity(), true).isNotNull(); 237 if (!skipSmartDelete && hasLeadingWhitespaceBeforeAdjustment) { 238 VisiblePosition visiblePos = VisiblePosition(m_upstreamStart, VP_DEFAULT_AFFINITY).previous(); 239 pos = visiblePos.deepEquivalent(); 240 // Expand out one character upstream for smart delete and recalculate 241 // positions based on this change. 242 m_upstreamStart = pos.upstream(); 243 m_downstreamStart = pos.downstream(); 244 m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(visiblePos.affinity()); 245 246 setStartingSelectionOnSmartDelete(m_upstreamStart, m_upstreamEnd); 247 } 248 249 // trailing whitespace is only considered for smart delete if there is no leading 250 // whitespace, as in the case where you double-click the first word of a paragraph. 251 if (!skipSmartDelete && !hasLeadingWhitespaceBeforeAdjustment && m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull()) { 252 // Expand out one character downstream for smart delete and recalculate 253 // positions based on this change. 254 pos = VisiblePosition(m_downstreamEnd, VP_DEFAULT_AFFINITY).next().deepEquivalent(); 255 m_upstreamEnd = pos.upstream(); 256 m_downstreamEnd = pos.downstream(); 257 m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY); 258 259 setStartingSelectionOnSmartDelete(m_downstreamStart, m_downstreamEnd); 260 } 261 } 262 263 // We must pass call parentAnchoredEquivalent on the positions since some editing positions 264 // that appear inside their nodes aren't really inside them. [hr, 0] is one example. 265 // FIXME: parentAnchoredEquivalent should eventually be moved into enclosing element getters 266 // like the one below, since editing functions should obviously accept editing positions. 267 // FIXME: Passing false to enclosingNodeOfType tells it that it's OK to return a non-editable 268 // node. This was done to match existing behavior, but it seems wrong. 269 m_startBlock = enclosingNodeOfType(m_downstreamStart.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary); 270 m_endBlock = enclosingNodeOfType(m_upstreamEnd.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary); 271 } 272 273 // We don't want to inherit style from an element which can't have contents. 274 static bool shouldNotInheritStyleFrom(const Node& node) 275 { 276 return !node.canContainRangeEndPoint(); 277 } 278 279 void DeleteSelectionCommand::saveTypingStyleState() 280 { 281 // A common case is deleting characters that are all from the same text node. In 282 // that case, the style at the start of the selection before deletion will be the 283 // same as the style at the start of the selection after deletion (since those 284 // two positions will be identical). Therefore there is no need to save the 285 // typing style at the start of the selection, nor is there a reason to 286 // compute the style at the start of the selection after deletion (see the 287 // early return in calculateTypingStyleAfterDelete). 288 if (m_upstreamStart.deprecatedNode() == m_downstreamEnd.deprecatedNode() && m_upstreamStart.deprecatedNode()->isTextNode()) 289 return; 290 291 if (shouldNotInheritStyleFrom(*m_selectionToDelete.start().anchorNode())) 292 return; 293 294 // Figure out the typing style in effect before the delete is done. 295 m_typingStyle = EditingStyle::create(m_selectionToDelete.start(), EditingStyle::EditingPropertiesInEffect); 296 m_typingStyle->removeStyleAddedByNode(enclosingAnchorElement(m_selectionToDelete.start())); 297 298 // If we're deleting into a Mail blockquote, save the style at end() instead of start() 299 // We'll use this later in computeTypingStyleAfterDelete if we end up outside of a Mail blockquote 300 if (enclosingNodeOfType(m_selectionToDelete.start(), isMailBlockquote)) 301 m_deleteIntoBlockquoteStyle = EditingStyle::create(m_selectionToDelete.end()); 302 else 303 m_deleteIntoBlockquoteStyle = 0; 304 } 305 306 bool DeleteSelectionCommand::handleSpecialCaseBRDelete() 307 { 308 Node* nodeAfterUpstreamStart = m_upstreamStart.computeNodeAfterPosition(); 309 Node* nodeAfterDownstreamStart = m_downstreamStart.computeNodeAfterPosition(); 310 // Upstream end will appear before BR due to canonicalization 311 Node* nodeAfterUpstreamEnd = m_upstreamEnd.computeNodeAfterPosition(); 312 313 if (!nodeAfterUpstreamStart || !nodeAfterDownstreamStart) 314 return false; 315 316 // Check for special-case where the selection contains only a BR on a line by itself after another BR. 317 bool upstreamStartIsBR = nodeAfterUpstreamStart->hasTagName(brTag); 318 bool downstreamStartIsBR = nodeAfterDownstreamStart->hasTagName(brTag); 319 bool isBROnLineByItself = upstreamStartIsBR && downstreamStartIsBR && nodeAfterDownstreamStart == nodeAfterUpstreamEnd; 320 if (isBROnLineByItself) { 321 removeNode(nodeAfterDownstreamStart); 322 return true; 323 } 324 325 // FIXME: This code doesn't belong in here. 326 // We detect the case where the start is an empty line consisting of BR not wrapped in a block element. 327 if (upstreamStartIsBR && downstreamStartIsBR && !(isStartOfBlock(positionBeforeNode(nodeAfterUpstreamStart)) && isEndOfBlock(positionAfterNode(nodeAfterUpstreamStart)))) { 328 m_startsAtEmptyLine = true; 329 m_endingPosition = m_downstreamEnd; 330 } 331 332 return false; 333 } 334 335 static Position firstEditablePositionInNode(Node* node) 336 { 337 ASSERT(node); 338 Node* next = node; 339 while (next && !next->rendererIsEditable()) 340 next = NodeTraversal::next(*next, node); 341 return next ? firstPositionInOrBeforeNode(next) : Position(); 342 } 343 344 void DeleteSelectionCommand::removeNode(PassRefPtr<Node> node, ShouldAssumeContentIsAlwaysEditable shouldAssumeContentIsAlwaysEditable) 345 { 346 if (!node) 347 return; 348 349 if (m_startRoot != m_endRoot && !(node->isDescendantOf(m_startRoot.get()) && node->isDescendantOf(m_endRoot.get()))) { 350 // If a node is not in both the start and end editable roots, remove it only if its inside an editable region. 351 if (!node->parentNode()->rendererIsEditable()) { 352 // Don't remove non-editable atomic nodes. 353 if (!node->firstChild()) 354 return; 355 // Search this non-editable region for editable regions to empty. 356 RefPtr<Node> child = node->firstChild(); 357 while (child) { 358 RefPtr<Node> nextChild = child->nextSibling(); 359 removeNode(child.get(), shouldAssumeContentIsAlwaysEditable); 360 // Bail if nextChild is no longer node's child. 361 if (nextChild && nextChild->parentNode() != node) 362 return; 363 child = nextChild; 364 } 365 366 // Don't remove editable regions that are inside non-editable ones, just clear them. 367 return; 368 } 369 } 370 371 if (isTableStructureNode(node.get()) || node->isRootEditableElement()) { 372 // Do not remove an element of table structure; remove its contents. 373 // Likewise for the root editable element. 374 Node* child = node->firstChild(); 375 while (child) { 376 Node* remove = child; 377 child = child->nextSibling(); 378 removeNode(remove, shouldAssumeContentIsAlwaysEditable); 379 } 380 381 // Make sure empty cell has some height, if a placeholder can be inserted. 382 document().updateLayoutIgnorePendingStylesheets(); 383 RenderObject *r = node->renderer(); 384 if (r && r->isTableCell() && toRenderTableCell(r)->contentHeight() <= 0) { 385 Position firstEditablePosition = firstEditablePositionInNode(node.get()); 386 if (firstEditablePosition.isNotNull()) 387 insertBlockPlaceholder(firstEditablePosition); 388 } 389 return; 390 } 391 392 if (node == m_startBlock && !isEndOfBlock(VisiblePosition(firstPositionInNode(m_startBlock.get())).previous())) 393 m_needPlaceholder = true; 394 else if (node == m_endBlock && !isStartOfBlock(VisiblePosition(lastPositionInNode(m_startBlock.get())).next())) 395 m_needPlaceholder = true; 396 397 // FIXME: Update the endpoints of the range being deleted. 398 updatePositionForNodeRemoval(m_endingPosition, node.get()); 399 updatePositionForNodeRemoval(m_leadingWhitespace, node.get()); 400 updatePositionForNodeRemoval(m_trailingWhitespace, node.get()); 401 402 CompositeEditCommand::removeNode(node, shouldAssumeContentIsAlwaysEditable); 403 } 404 405 static void updatePositionForTextRemoval(Node* node, int offset, int count, Position& position) 406 { 407 if (position.anchorType() != Position::PositionIsOffsetInAnchor || position.containerNode() != node) 408 return; 409 410 if (position.offsetInContainerNode() > offset + count) 411 position.moveToOffset(position.offsetInContainerNode() - count); 412 else if (position.offsetInContainerNode() > offset) 413 position.moveToOffset(offset); 414 } 415 416 void DeleteSelectionCommand::deleteTextFromNode(PassRefPtr<Text> node, unsigned offset, unsigned count) 417 { 418 // FIXME: Update the endpoints of the range being deleted. 419 updatePositionForTextRemoval(node.get(), offset, count, m_endingPosition); 420 updatePositionForTextRemoval(node.get(), offset, count, m_leadingWhitespace); 421 updatePositionForTextRemoval(node.get(), offset, count, m_trailingWhitespace); 422 updatePositionForTextRemoval(node.get(), offset, count, m_downstreamEnd); 423 424 CompositeEditCommand::deleteTextFromNode(node, offset, count); 425 } 426 427 void DeleteSelectionCommand::makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss() 428 { 429 RefPtr<Range> range = m_selectionToDelete.toNormalizedRange(); 430 RefPtr<Node> node = range->firstNode(); 431 while (node && node != range->pastLastNode()) { 432 RefPtr<Node> nextNode = NodeTraversal::next(*node); 433 if ((node->hasTagName(styleTag) && !(toElement(node)->hasAttribute(scopedAttr))) || node->hasTagName(linkTag)) { 434 nextNode = NodeTraversal::nextSkippingChildren(*node); 435 RefPtr<ContainerNode> rootEditableElement = node->rootEditableElement(); 436 if (rootEditableElement.get()) { 437 removeNode(node); 438 appendNode(node, rootEditableElement); 439 } 440 } 441 node = nextNode; 442 } 443 } 444 445 void DeleteSelectionCommand::handleGeneralDelete() 446 { 447 if (m_upstreamStart.isNull()) 448 return; 449 450 int startOffset = m_upstreamStart.deprecatedEditingOffset(); 451 Node* startNode = m_upstreamStart.deprecatedNode(); 452 ASSERT(startNode); 453 454 makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss(); 455 456 // Never remove the start block unless it's a table, in which case we won't merge content in. 457 if (startNode->isSameNode(m_startBlock.get()) && !startOffset && canHaveChildrenForEditing(startNode) && !isHTMLTableElement(startNode)) { 458 startOffset = 0; 459 startNode = NodeTraversal::next(*startNode); 460 if (!startNode) 461 return; 462 } 463 464 if (startOffset >= caretMaxOffset(startNode) && startNode->isTextNode()) { 465 Text* text = toText(startNode); 466 if (text->length() > (unsigned)caretMaxOffset(startNode)) 467 deleteTextFromNode(text, caretMaxOffset(startNode), text->length() - caretMaxOffset(startNode)); 468 } 469 470 if (startOffset >= lastOffsetForEditing(startNode)) { 471 startNode = NodeTraversal::nextSkippingChildren(*startNode); 472 startOffset = 0; 473 } 474 475 // Done adjusting the start. See if we're all done. 476 if (!startNode) 477 return; 478 479 if (startNode == m_downstreamEnd.deprecatedNode()) { 480 if (m_downstreamEnd.deprecatedEditingOffset() - startOffset > 0) { 481 if (startNode->isTextNode()) { 482 // in a text node that needs to be trimmed 483 Text* text = toText(startNode); 484 deleteTextFromNode(text, startOffset, m_downstreamEnd.deprecatedEditingOffset() - startOffset); 485 } else { 486 removeChildrenInRange(startNode, startOffset, m_downstreamEnd.deprecatedEditingOffset()); 487 m_endingPosition = m_upstreamStart; 488 } 489 } 490 491 // The selection to delete is all in one node. 492 if (!startNode->renderer() || (!startOffset && m_downstreamEnd.atLastEditingPositionForNode())) 493 removeNode(startNode); 494 } 495 else { 496 bool startNodeWasDescendantOfEndNode = m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode()); 497 // The selection to delete spans more than one node. 498 RefPtr<Node> node(startNode); 499 500 if (startOffset > 0) { 501 if (startNode->isTextNode()) { 502 // in a text node that needs to be trimmed 503 Text* text = toText(node); 504 deleteTextFromNode(text, startOffset, text->length() - startOffset); 505 node = NodeTraversal::next(*node); 506 } else { 507 node = startNode->childNode(startOffset); 508 } 509 } else if (startNode == m_upstreamEnd.deprecatedNode() && startNode->isTextNode()) { 510 Text* text = toText(m_upstreamEnd.deprecatedNode()); 511 deleteTextFromNode(text, 0, m_upstreamEnd.deprecatedEditingOffset()); 512 } 513 514 // handle deleting all nodes that are completely selected 515 while (node && node != m_downstreamEnd.deprecatedNode()) { 516 if (comparePositions(firstPositionInOrBeforeNode(node.get()), m_downstreamEnd) >= 0) { 517 // NodeTraversal::nextSkippingChildren just blew past the end position, so stop deleting 518 node = 0; 519 } else if (!m_downstreamEnd.deprecatedNode()->isDescendantOf(node.get())) { 520 RefPtr<Node> nextNode = NodeTraversal::nextSkippingChildren(*node); 521 // if we just removed a node from the end container, update end position so the 522 // check above will work 523 updatePositionForNodeRemoval(m_downstreamEnd, node.get()); 524 removeNode(node.get()); 525 node = nextNode.get(); 526 } else { 527 Node& n = node->lastDescendant(); 528 if (m_downstreamEnd.deprecatedNode() == n && m_downstreamEnd.deprecatedEditingOffset() >= caretMaxOffset(&n)) { 529 removeNode(node.get()); 530 node = 0; 531 } else { 532 node = NodeTraversal::next(*node); 533 } 534 } 535 } 536 537 if (m_downstreamEnd.deprecatedNode() != startNode && !m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode()) && m_downstreamEnd.inDocument() && m_downstreamEnd.deprecatedEditingOffset() >= caretMinOffset(m_downstreamEnd.deprecatedNode())) { 538 if (m_downstreamEnd.atLastEditingPositionForNode() && !canHaveChildrenForEditing(m_downstreamEnd.deprecatedNode())) { 539 // The node itself is fully selected, not just its contents. Delete it. 540 removeNode(m_downstreamEnd.deprecatedNode()); 541 } else { 542 if (m_downstreamEnd.deprecatedNode()->isTextNode()) { 543 // in a text node that needs to be trimmed 544 Text* text = toText(m_downstreamEnd.deprecatedNode()); 545 if (m_downstreamEnd.deprecatedEditingOffset() > 0) { 546 deleteTextFromNode(text, 0, m_downstreamEnd.deprecatedEditingOffset()); 547 } 548 // Remove children of m_downstreamEnd.deprecatedNode() that come after m_upstreamStart. 549 // Don't try to remove children if m_upstreamStart was inside m_downstreamEnd.deprecatedNode() 550 // and m_upstreamStart has been removed from the document, because then we don't 551 // know how many children to remove. 552 // FIXME: Make m_upstreamStart a position we update as we remove content, then we can 553 // always know which children to remove. 554 } else if (!(startNodeWasDescendantOfEndNode && !m_upstreamStart.inDocument())) { 555 int offset = 0; 556 if (m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode())) { 557 Node* n = m_upstreamStart.deprecatedNode(); 558 while (n && n->parentNode() != m_downstreamEnd.deprecatedNode()) 559 n = n->parentNode(); 560 if (n) 561 offset = n->nodeIndex() + 1; 562 } 563 removeChildrenInRange(m_downstreamEnd.deprecatedNode(), offset, m_downstreamEnd.deprecatedEditingOffset()); 564 m_downstreamEnd = createLegacyEditingPosition(m_downstreamEnd.deprecatedNode(), offset); 565 } 566 } 567 } 568 } 569 } 570 571 void DeleteSelectionCommand::fixupWhitespace() 572 { 573 document().updateLayoutIgnorePendingStylesheets(); 574 // FIXME: isRenderedCharacter should be removed, and we should use VisiblePosition::characterAfter and VisiblePosition::characterBefore 575 if (m_leadingWhitespace.isNotNull() && !m_leadingWhitespace.isRenderedCharacter() && m_leadingWhitespace.deprecatedNode()->isTextNode()) { 576 Text* textNode = toText(m_leadingWhitespace.deprecatedNode()); 577 ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace()); 578 replaceTextInNodePreservingMarkers(textNode, m_leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString()); 579 } 580 if (m_trailingWhitespace.isNotNull() && !m_trailingWhitespace.isRenderedCharacter() && m_trailingWhitespace.deprecatedNode()->isTextNode()) { 581 Text* textNode = toText(m_trailingWhitespace.deprecatedNode()); 582 ASSERT(!textNode->renderer() ||textNode->renderer()->style()->collapseWhiteSpace()); 583 replaceTextInNodePreservingMarkers(textNode, m_trailingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString()); 584 } 585 } 586 587 // If a selection starts in one block and ends in another, we have to merge to bring content before the 588 // start together with content after the end. 589 void DeleteSelectionCommand::mergeParagraphs() 590 { 591 if (!m_mergeBlocksAfterDelete) { 592 if (m_pruneStartBlockIfNecessary) { 593 // We aren't going to merge into the start block, so remove it if it's empty. 594 prune(m_startBlock); 595 // Removing the start block during a deletion is usually an indication that we need 596 // a placeholder, but not in this case. 597 m_needPlaceholder = false; 598 } 599 return; 600 } 601 602 // It shouldn't have been asked to both try and merge content into the start block and prune it. 603 ASSERT(!m_pruneStartBlockIfNecessary); 604 605 // FIXME: Deletion should adjust selection endpoints as it removes nodes so that we never get into this state (4099839). 606 if (!m_downstreamEnd.inDocument() || !m_upstreamStart.inDocument()) 607 return; 608 609 // FIXME: The deletion algorithm shouldn't let this happen. 610 if (comparePositions(m_upstreamStart, m_downstreamEnd) > 0) 611 return; 612 613 // There's nothing to merge. 614 if (m_upstreamStart == m_downstreamEnd) 615 return; 616 617 VisiblePosition startOfParagraphToMove(m_downstreamEnd); 618 VisiblePosition mergeDestination(m_upstreamStart); 619 620 // m_downstreamEnd's block has been emptied out by deletion. There is no content inside of it to 621 // move, so just remove it. 622 Element* endBlock = enclosingBlock(m_downstreamEnd.deprecatedNode()); 623 if (!endBlock || !endBlock->contains(startOfParagraphToMove.deepEquivalent().deprecatedNode()) || !startOfParagraphToMove.deepEquivalent().deprecatedNode()) { 624 removeNode(enclosingBlock(m_downstreamEnd.deprecatedNode())); 625 return; 626 } 627 628 // We need to merge into m_upstreamStart's block, but it's been emptied out and collapsed by deletion. 629 if (!mergeDestination.deepEquivalent().deprecatedNode() || (!mergeDestination.deepEquivalent().deprecatedNode()->isDescendantOf(enclosingBlock(m_upstreamStart.containerNode())) && (!mergeDestination.deepEquivalent().anchorNode()->firstChild() || !m_upstreamStart.containerNode()->firstChild())) || (m_startsAtEmptyLine && mergeDestination != startOfParagraphToMove)) { 630 insertNodeAt(createBreakElement(document()).get(), m_upstreamStart); 631 mergeDestination = VisiblePosition(m_upstreamStart); 632 } 633 634 if (mergeDestination == startOfParagraphToMove) 635 return; 636 637 VisiblePosition endOfParagraphToMove = endOfParagraph(startOfParagraphToMove); 638 639 if (mergeDestination == endOfParagraphToMove) 640 return; 641 642 // The rule for merging into an empty block is: only do so if its farther to the right. 643 // FIXME: Consider RTL. 644 if (!m_startsAtEmptyLine && isStartOfParagraph(mergeDestination) && startOfParagraphToMove.absoluteCaretBounds().x() > mergeDestination.absoluteCaretBounds().x()) { 645 if (mergeDestination.deepEquivalent().downstream().deprecatedNode()->hasTagName(brTag)) { 646 removeNodeAndPruneAncestors(mergeDestination.deepEquivalent().downstream().deprecatedNode()); 647 m_endingPosition = startOfParagraphToMove.deepEquivalent(); 648 return; 649 } 650 } 651 652 // Block images, tables and horizontal rules cannot be made inline with content at mergeDestination. If there is 653 // any (!isStartOfParagraph(mergeDestination)), don't merge, just move the caret to just before the selection we deleted. 654 // See https://bugs.webkit.org/show_bug.cgi?id=25439 655 if (isRenderedAsNonInlineTableImageOrHR(startOfParagraphToMove.deepEquivalent().deprecatedNode()) && !isStartOfParagraph(mergeDestination)) { 656 m_endingPosition = m_upstreamStart; 657 return; 658 } 659 660 // moveParagraphs will insert placeholders if it removes blocks that would require their use, don't let block 661 // removals that it does cause the insertion of *another* placeholder. 662 bool needPlaceholder = m_needPlaceholder; 663 bool paragraphToMergeIsEmpty = (startOfParagraphToMove == endOfParagraphToMove); 664 moveParagraph(startOfParagraphToMove, endOfParagraphToMove, mergeDestination, false, !paragraphToMergeIsEmpty); 665 m_needPlaceholder = needPlaceholder; 666 // The endingPosition was likely clobbered by the move, so recompute it (moveParagraph selects the moved paragraph). 667 m_endingPosition = endingSelection().start(); 668 } 669 670 void DeleteSelectionCommand::removePreviouslySelectedEmptyTableRows() 671 { 672 if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow) { 673 Node* row = m_endTableRow->previousSibling(); 674 while (row && row != m_startTableRow) { 675 RefPtr<Node> previousRow = row->previousSibling(); 676 if (isTableRowEmpty(row)) 677 // Use a raw removeNode, instead of DeleteSelectionCommand's, because 678 // that won't remove rows, it only empties them in preparation for this function. 679 CompositeEditCommand::removeNode(row); 680 row = previousRow.get(); 681 } 682 } 683 684 // Remove empty rows after the start row. 685 if (m_startTableRow && m_startTableRow->inDocument() && m_startTableRow != m_endTableRow) { 686 Node* row = m_startTableRow->nextSibling(); 687 while (row && row != m_endTableRow) { 688 RefPtr<Node> nextRow = row->nextSibling(); 689 if (isTableRowEmpty(row)) 690 CompositeEditCommand::removeNode(row); 691 row = nextRow.get(); 692 } 693 } 694 695 if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow) 696 if (isTableRowEmpty(m_endTableRow.get())) { 697 // Don't remove m_endTableRow if it's where we're putting the ending selection. 698 if (!m_endingPosition.deprecatedNode()->isDescendantOf(m_endTableRow.get())) { 699 // FIXME: We probably shouldn't remove m_endTableRow unless it's fully selected, even if it is empty. 700 // We'll need to start adjusting the selection endpoints during deletion to know whether or not m_endTableRow 701 // was fully selected here. 702 CompositeEditCommand::removeNode(m_endTableRow.get()); 703 } 704 } 705 } 706 707 void DeleteSelectionCommand::calculateTypingStyleAfterDelete() 708 { 709 // Clearing any previously set typing style and doing an early return. 710 if (!m_typingStyle) { 711 document().frame()->selection().clearTypingStyle(); 712 return; 713 } 714 715 // Compute the difference between the style before the delete and the style now 716 // after the delete has been done. Set this style on the frame, so other editing 717 // commands being composed with this one will work, and also cache it on the command, 718 // so the Frame::appliedEditing can set it after the whole composite command 719 // has completed. 720 721 // If we deleted into a blockquote, but are now no longer in a blockquote, use the alternate typing style 722 if (m_deleteIntoBlockquoteStyle && !enclosingNodeOfType(m_endingPosition, isMailBlockquote, CanCrossEditingBoundary)) 723 m_typingStyle = m_deleteIntoBlockquoteStyle; 724 m_deleteIntoBlockquoteStyle = 0; 725 726 m_typingStyle->prepareToApplyAt(m_endingPosition); 727 if (m_typingStyle->isEmpty()) 728 m_typingStyle = 0; 729 // This is where we've deleted all traces of a style but not a whole paragraph (that's handled above). 730 // In this case if we start typing, the new characters should have the same style as the just deleted ones, 731 // but, if we change the selection, come back and start typing that style should be lost. Also see 732 // preserveTypingStyle() below. 733 document().frame()->selection().setTypingStyle(m_typingStyle); 734 } 735 736 void DeleteSelectionCommand::clearTransientState() 737 { 738 m_selectionToDelete = VisibleSelection(); 739 m_upstreamStart.clear(); 740 m_downstreamStart.clear(); 741 m_upstreamEnd.clear(); 742 m_downstreamEnd.clear(); 743 m_endingPosition.clear(); 744 m_leadingWhitespace.clear(); 745 m_trailingWhitespace.clear(); 746 } 747 748 // This method removes div elements with no attributes that have only one child or no children at all. 749 void DeleteSelectionCommand::removeRedundantBlocks() 750 { 751 Node* node = m_endingPosition.containerNode(); 752 Node* rootNode = node->rootEditableElement(); 753 754 while (node != rootNode) { 755 if (isRemovableBlock(node)) { 756 if (node == m_endingPosition.anchorNode()) 757 updatePositionForNodeRemovalPreservingChildren(m_endingPosition, node); 758 759 CompositeEditCommand::removeNodePreservingChildren(node); 760 node = m_endingPosition.anchorNode(); 761 } else 762 node = node->parentNode(); 763 } 764 } 765 766 void DeleteSelectionCommand::doApply() 767 { 768 // If selection has not been set to a custom selection when the command was created, 769 // use the current ending selection. 770 if (!m_hasSelectionToDelete) 771 m_selectionToDelete = endingSelection(); 772 773 if (!m_selectionToDelete.isNonOrphanedRange()) 774 return; 775 776 // save this to later make the selection with 777 EAffinity affinity = m_selectionToDelete.affinity(); 778 779 Position downstreamEnd = m_selectionToDelete.end().downstream(); 780 bool rootWillStayOpenWithoutPlaceholder = downstreamEnd.containerNode() == downstreamEnd.containerNode()->rootEditableElement() 781 || (downstreamEnd.containerNode()->isTextNode() && downstreamEnd.containerNode()->parentNode() == downstreamEnd.containerNode()->rootEditableElement()); 782 bool lineBreakAtEndOfSelectionToDelete = lineBreakExistsAtVisiblePosition(m_selectionToDelete.visibleEnd()); 783 m_needPlaceholder = !rootWillStayOpenWithoutPlaceholder 784 && isStartOfParagraph(m_selectionToDelete.visibleStart(), CanCrossEditingBoundary) 785 && isEndOfParagraph(m_selectionToDelete.visibleEnd(), CanCrossEditingBoundary) 786 && !lineBreakAtEndOfSelectionToDelete; 787 if (m_needPlaceholder) { 788 // Don't need a placeholder when deleting a selection that starts just before a table 789 // and ends inside it (we do need placeholders to hold open empty cells, but that's 790 // handled elsewhere). 791 if (Node* table = isLastPositionBeforeTable(m_selectionToDelete.visibleStart())) 792 if (m_selectionToDelete.end().deprecatedNode()->isDescendantOf(table)) 793 m_needPlaceholder = false; 794 } 795 796 797 // set up our state 798 initializePositionData(); 799 800 bool lineBreakBeforeStart = lineBreakExistsAtVisiblePosition(VisiblePosition(m_upstreamStart).previous()); 801 802 // Delete any text that may hinder our ability to fixup whitespace after the delete 803 deleteInsignificantTextDownstream(m_trailingWhitespace); 804 805 saveTypingStyleState(); 806 807 // deleting just a BR is handled specially, at least because we do not 808 // want to replace it with a placeholder BR! 809 if (handleSpecialCaseBRDelete()) { 810 calculateTypingStyleAfterDelete(); 811 setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional())); 812 clearTransientState(); 813 rebalanceWhitespace(); 814 return; 815 } 816 817 handleGeneralDelete(); 818 819 fixupWhitespace(); 820 821 mergeParagraphs(); 822 823 removePreviouslySelectedEmptyTableRows(); 824 825 if (!m_needPlaceholder && rootWillStayOpenWithoutPlaceholder) { 826 VisiblePosition visualEnding(m_endingPosition); 827 bool hasPlaceholder = lineBreakExistsAtVisiblePosition(visualEnding) 828 && visualEnding.next(CannotCrossEditingBoundary).isNull(); 829 m_needPlaceholder = hasPlaceholder && lineBreakBeforeStart && !lineBreakAtEndOfSelectionToDelete; 830 } 831 832 RefPtr<Node> placeholder = m_needPlaceholder ? createBreakElement(document()).get() : 0; 833 834 if (placeholder) { 835 if (m_sanitizeMarkup) 836 removeRedundantBlocks(); 837 insertNodeAt(placeholder.get(), m_endingPosition); 838 } 839 840 rebalanceWhitespaceAt(m_endingPosition); 841 842 calculateTypingStyleAfterDelete(); 843 844 setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional())); 845 clearTransientState(); 846 } 847 848 EditAction DeleteSelectionCommand::editingAction() const 849 { 850 // Note that DeleteSelectionCommand is also used when the user presses the Delete key, 851 // but in that case there's a TypingCommand that supplies the editingAction(), so 852 // the Undo menu correctly shows "Undo Typing" 853 return EditActionCut; 854 } 855 856 // Normally deletion doesn't preserve the typing style that was present before it. For example, 857 // type a character, Bold, then delete the character and start typing. The Bold typing style shouldn't 858 // stick around. Deletion should preserve a typing style that *it* sets, however. 859 bool DeleteSelectionCommand::preservesTypingStyle() const 860 { 861 return m_typingStyle; 862 } 863 864 } // namespace WebCore 865
