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