324 lines
16 KiB
C++
324 lines
16 KiB
C++
/*
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* Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "ApplyBlockElementCommand.h"
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#include "Editing.h"
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#include "HTMLBRElement.h"
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#include "HTMLNames.h"
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#include "RenderElement.h"
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#include "RenderStyle.h"
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#include "Text.h"
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#include "VisibleUnits.h"
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namespace WebCore {
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using namespace HTMLNames;
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ApplyBlockElementCommand::ApplyBlockElementCommand(Document& document, const QualifiedName& tagName, const AtomString& inlineStyle)
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: CompositeEditCommand(document)
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, m_tagName(tagName)
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, m_inlineStyle(inlineStyle)
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{
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}
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ApplyBlockElementCommand::ApplyBlockElementCommand(Document& document, const QualifiedName& tagName)
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: CompositeEditCommand(document)
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, m_tagName(tagName)
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{
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}
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void ApplyBlockElementCommand::doApply()
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{
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if (!endingSelection().rootEditableElement())
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return;
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VisiblePosition visibleEnd = endingSelection().visibleEnd();
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VisiblePosition visibleStart = endingSelection().visibleStart();
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if (visibleStart.isNull() || visibleStart.isOrphan() || visibleEnd.isNull() || visibleEnd.isOrphan())
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return;
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// When a selection ends at the start of a paragraph, we rarely paint
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// the selection gap before that paragraph, because there often is no gap.
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// In a case like this, it's not obvious to the user that the selection
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// ends "inside" that paragraph, so it would be confusing if Indent/Outdent
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// operated on that paragraph.
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// FIXME: We paint the gap before some paragraphs that are indented with left
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// margin/padding, but not others. We should make the gap painting more consistent and
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// then use a left margin/padding rule here.
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if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd)) {
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VisibleSelection newSelection(visibleStart, visibleEnd.previous(CannotCrossEditingBoundary), endingSelection().isDirectional());
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if (newSelection.isNone())
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return;
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setEndingSelection(newSelection);
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}
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VisibleSelection selection = selectionForParagraphIteration(endingSelection());
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VisiblePosition startOfSelection = selection.visibleStart();
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VisiblePosition endOfSelection = selection.visibleEnd();
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ASSERT(!startOfSelection.isNull());
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ASSERT(!endOfSelection.isNull());
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RefPtr<ContainerNode> startScope;
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int startIndex = indexForVisiblePosition(startOfSelection, startScope);
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RefPtr<ContainerNode> endScope;
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int endIndex = indexForVisiblePosition(endOfSelection, endScope);
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formatSelection(startOfSelection, endOfSelection);
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document().updateLayoutIgnorePendingStylesheets();
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ASSERT(startScope == endScope);
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ASSERT(startIndex >= 0);
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ASSERT(startIndex <= endIndex);
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if (startScope == endScope && startIndex >= 0 && startIndex <= endIndex) {
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VisiblePosition start(visiblePositionForIndex(startIndex, startScope.get()));
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VisiblePosition end(visiblePositionForIndex(endIndex, endScope.get()));
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// Work around the fact indexForVisiblePosition can return a larger index due to TextIterator
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// using an extra newline to represent a large margin.
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// FIXME: Add a new TextIteratorBehavior to suppress it.
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if (start.isNotNull() && end.isNull())
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end = lastPositionInNode(endScope.get());
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if (start.isNotNull() && end.isNotNull())
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setEndingSelection(VisibleSelection(start, end, endingSelection().isDirectional()));
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}
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}
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void ApplyBlockElementCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
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{
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// Special case empty unsplittable elements because there's nothing to split
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// and there's nothing to move.
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Position start = startOfSelection.deepEquivalent().downstream();
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if (isAtUnsplittableElement(start) && startOfParagraph(start) == endOfParagraph(endOfSelection)) {
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auto blockquote = createBlockElement();
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insertNodeAt(blockquote.copyRef(), start);
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auto placeholder = HTMLBRElement::create(document());
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appendNode(placeholder.copyRef(), WTFMove(blockquote));
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setEndingSelection(VisibleSelection(positionBeforeNode(placeholder.ptr()), Affinity::Downstream, endingSelection().isDirectional()));
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return;
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}
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RefPtr<Element> blockquoteForNextIndent;
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VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
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VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());
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m_endOfLastParagraph = endOfParagraph(endOfSelection).deepEquivalent();
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bool atEnd = false;
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Position end;
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while (endOfCurrentParagraph != endAfterSelection && !atEnd) {
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if (endOfCurrentParagraph.deepEquivalent() == m_endOfLastParagraph)
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atEnd = true;
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rangeForParagraphSplittingTextNodesIfNeeded(endOfCurrentParagraph, start, end);
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if (start.isNull() || end.isNull())
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break;
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endOfCurrentParagraph = end;
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// FIXME: endOfParagraph can errornously return a position at the beginning of a block element
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// when the position passed into endOfParagraph is at the beginning of a block.
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// Work around this bug here because too much of the existing code depends on the current behavior of endOfParagraph.
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if (start == end && startOfBlock(start) != endOfBlock(start) && !isEndOfBlock(end) && start == startOfParagraph(endOfBlock(start))) {
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endOfCurrentParagraph = endOfBlock(end);
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end = endOfCurrentParagraph.deepEquivalent();
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}
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Position afterEnd = end.next();
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RefPtr enclosingCell = enclosingNodeOfType(start, &isTableCell);
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VisiblePosition endOfNextParagraph = endOfNextParagraphSplittingTextNodesIfNeeded(endOfCurrentParagraph, start, end);
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formatRange(start, end, m_endOfLastParagraph, blockquoteForNextIndent);
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// Don't put the next paragraph in the blockquote we just created for this paragraph unless
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// the next paragraph is in the same cell.
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if (enclosingCell && enclosingCell != enclosingNodeOfType(endOfNextParagraph.deepEquivalent(), &isTableCell))
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blockquoteForNextIndent = nullptr;
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// indentIntoBlockquote could move more than one paragraph if the paragraph
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// is in a list item or a table. As a result, endAfterSelection could refer to a position
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// no longer in the document.
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if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().anchorNode()->isConnected())
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break;
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// Sanity check: Make sure our moveParagraph calls didn't remove endOfNextParagraph.deepEquivalent().deprecatedNode()
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// If somehow we did, return to prevent crashes.
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if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().anchorNode()->isConnected()) {
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ASSERT_NOT_REACHED();
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return;
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}
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endOfCurrentParagraph = endOfNextParagraph;
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}
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}
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static bool isNewLineAtPosition(const Position& position)
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{
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RefPtr textNode = position.containerNode();
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unsigned offset = position.offsetInContainerNode();
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if (!is<Text>(textNode) || offset >= downcast<Text>(*textNode).length())
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return false;
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return downcast<Text>(*textNode).data()[offset] == '\n';
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}
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const RenderStyle* ApplyBlockElementCommand::renderStyleOfEnclosingTextNode(const Position& position)
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{
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if (position.anchorType() != Position::PositionIsOffsetInAnchor
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|| !position.containerNode()
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|| !position.containerNode()->isTextNode())
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return nullptr;
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document().updateStyleIfNeeded();
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RenderObject* renderer = position.containerNode()->renderer();
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if (!renderer)
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return nullptr;
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return &renderer->style();
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}
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void ApplyBlockElementCommand::rangeForParagraphSplittingTextNodesIfNeeded(const VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
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{
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start = startOfParagraph(endOfCurrentParagraph).deepEquivalent();
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end = endOfCurrentParagraph.deepEquivalent();
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bool isStartAndEndOnSameNode = false;
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if (auto* startStyle = renderStyleOfEnclosingTextNode(start)) {
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isStartAndEndOnSameNode = renderStyleOfEnclosingTextNode(end) && start.containerNode() == end.containerNode();
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bool isStartAndEndOfLastParagraphOnSameNode = renderStyleOfEnclosingTextNode(m_endOfLastParagraph) && start.containerNode() == m_endOfLastParagraph.containerNode();
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bool preservesNewLine = startStyle->preserveNewline();
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bool collapsesWhiteSpace = startStyle->collapseWhiteSpace();
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startStyle = nullptr;
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// Avoid obtanining the start of next paragraph for start
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if (preservesNewLine && isNewLineAtPosition(start) && !isNewLineAtPosition(start.previous()) && start.offsetInContainerNode() > 0)
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start = startOfParagraph(end.previous()).deepEquivalent();
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// If start is in the middle of a text node, split.
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if (!collapsesWhiteSpace && start.offsetInContainerNode() > 0) {
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int startOffset = start.offsetInContainerNode();
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RefPtr startText = start.containerText();
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ASSERT(startText);
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splitTextNode(*startText, startOffset);
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start = firstPositionInNode(startText.get());
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if (isStartAndEndOnSameNode) {
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ASSERT(end.offsetInContainerNode() >= startOffset);
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end = Position(startText.get(), end.offsetInContainerNode() - startOffset);
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}
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if (isStartAndEndOfLastParagraphOnSameNode) {
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ASSERT(m_endOfLastParagraph.offsetInContainerNode() >= startOffset);
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m_endOfLastParagraph = Position(startText.get(), m_endOfLastParagraph.offsetInContainerNode() - startOffset);
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}
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}
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}
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if (auto* endStyle = renderStyleOfEnclosingTextNode(end)) {
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bool isEndAndEndOfLastParagraphOnSameNode = renderStyleOfEnclosingTextNode(m_endOfLastParagraph) && end.deprecatedNode() == m_endOfLastParagraph.deprecatedNode();
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// Include \n at the end of line if we're at an empty paragraph
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unsigned endOffset = end.offsetInContainerNode();
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bool preservesNewLine = endStyle->preserveNewline();
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bool collapseWhiteSpace = endStyle->collapseWhiteSpace();
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auto userModify = endStyle->userModify();
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endStyle = nullptr;
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if (preservesNewLine && start == end && endOffset < end.containerNode()->length()) {
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if (!isNewLineAtPosition(end.previous()) && isNewLineAtPosition(end))
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end = Position(end.containerText(), ++endOffset);
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if (isEndAndEndOfLastParagraphOnSameNode && end.offsetInContainerNode() >= m_endOfLastParagraph.offsetInContainerNode())
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m_endOfLastParagraph = end;
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}
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// If end is in the middle of a text node and the text node is editable, split.
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if (userModify != UserModify::ReadOnly && !collapseWhiteSpace && endOffset && endOffset < end.containerNode()->length()) {
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RefPtr<Text> endContainer = end.containerText();
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splitTextNode(*endContainer, endOffset);
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if (is<Text>(endContainer) && !endContainer->previousSibling()) {
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start = { };
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end = { };
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return;
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}
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if (isStartAndEndOnSameNode)
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start = firstPositionInOrBeforeNode(endContainer->previousSibling());
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if (isEndAndEndOfLastParagraphOnSameNode) {
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if (static_cast<unsigned>(m_endOfLastParagraph.offsetInContainerNode()) == endOffset)
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m_endOfLastParagraph = lastPositionInOrAfterNode(endContainer->previousSibling());
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else
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m_endOfLastParagraph = Position(endContainer.get(), m_endOfLastParagraph.offsetInContainerNode() - endOffset);
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}
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end = lastPositionInNode(endContainer->previousSibling());
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}
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}
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}
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VisiblePosition ApplyBlockElementCommand::endOfNextParagraphSplittingTextNodesIfNeeded(VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
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{
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VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
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Position position = endOfNextParagraph.deepEquivalent();
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auto* style = renderStyleOfEnclosingTextNode(position);
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if (!style)
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return endOfNextParagraph;
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bool preserveNewLine = style->preserveNewline();
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style = nullptr;
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RefPtr<Text> text = position.containerText();
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if (!preserveNewLine || !position.offsetInContainerNode() || !isNewLineAtPosition(firstPositionInNode(text.get())))
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return endOfNextParagraph;
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// \n at the beginning of the text node immediately following the current paragraph is trimmed by moveParagraphWithClones.
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// If endOfNextParagraph was pointing at this same text node, endOfNextParagraph will be shifted by one paragraph.
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// Avoid this by splitting "\n"
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splitTextNode(*text, 1);
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auto previousSiblingOfText = makeRefPtr(text->previousSibling());
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if (text == start.containerNode() && previousSiblingOfText && is<Text>(previousSiblingOfText)) {
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ASSERT(start.offsetInContainerNode() < position.offsetInContainerNode());
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start = Position(downcast<Text>(text->previousSibling()), start.offsetInContainerNode());
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}
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if (text == end.containerNode() && previousSiblingOfText && is<Text>(previousSiblingOfText)) {
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ASSERT(end.offsetInContainerNode() < position.offsetInContainerNode());
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end = Position(downcast<Text>(text->previousSibling()), end.offsetInContainerNode());
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}
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if (text == m_endOfLastParagraph.containerNode()) {
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if (m_endOfLastParagraph.offsetInContainerNode() < position.offsetInContainerNode()) {
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// We can only fix endOfLastParagraph if the previous node was still text and hasn't been modified by script.
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if (previousSiblingOfText && is<Text>(previousSiblingOfText)
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&& static_cast<unsigned>(m_endOfLastParagraph.offsetInContainerNode()) <= downcast<Text>(text->previousSibling())->length())
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m_endOfLastParagraph = Position(downcast<Text>(text->previousSibling()), m_endOfLastParagraph.offsetInContainerNode());
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} else
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m_endOfLastParagraph = Position(text.get(), m_endOfLastParagraph.offsetInContainerNode() - 1);
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}
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return Position(text.get(), position.offsetInContainerNode() - 1);
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}
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Ref<HTMLElement> ApplyBlockElementCommand::createBlockElement()
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{
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auto element = createHTMLElement(document(), m_tagName);
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if (m_inlineStyle.length())
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element->setAttribute(styleAttr, m_inlineStyle);
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return element;
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}
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}
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