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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 "HTMLElement.h"
#include "HTMLNames.h"
#include "Text.h"
#include "TextIterator.h"
#include "VisiblePosition.h"
#include "htmlediting.h"
#include "visible_units.h"
namespace WebCore {
using namespace HTMLNames;
ApplyBlockElementCommand::ApplyBlockElementCommand(Document* document, const QualifiedName& tagName, const AtomicString& className, const AtomicString& inlineStyle)
: CompositeEditCommand(document)
, m_tagName(tagName)
, m_className(className)
, m_inlineStyle(inlineStyle)
{
}
ApplyBlockElementCommand::ApplyBlockElementCommand(Document* document, const QualifiedName& tagName)
: CompositeEditCommand(document)
, m_tagName(tagName)
{
}
void ApplyBlockElementCommand::doApply()
{
if (!endingSelection().isNonOrphanedCaretOrRange())
return;
if (!endingSelection().rootEditableElement())
return;
VisiblePosition visibleEnd = endingSelection().visibleEnd();
VisiblePosition visibleStart = endingSelection().visibleStart();
// 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))
setEndingSelection(VisibleSelection(visibleStart, visibleEnd.previous(CannotCrossEditingBoundary)));
VisibleSelection selection = selectionForParagraphIteration(endingSelection());
VisiblePosition startOfSelection = selection.visibleStart();
VisiblePosition endOfSelection = selection.visibleEnd();
ASSERT(!startOfSelection.isNull());
ASSERT(!endOfSelection.isNull());
int startIndex = indexForVisiblePosition(startOfSelection);
int endIndex = indexForVisiblePosition(endOfSelection);
formatSelection(startOfSelection, endOfSelection);
updateLayout();
RefPtr<Range> startRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), startIndex, 0, true);
RefPtr<Range> endRange = TextIterator::rangeFromLocationAndLength(document()->documentElement(), endIndex, 0, true);
if (startRange && endRange)
setEndingSelection(VisibleSelection(startRange->startPosition(), endRange->startPosition(), DOWNSTREAM));
}
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)) {
RefPtr<Element> blockquote = createBlockElement();
insertNodeAt(blockquote, start);
RefPtr<Element> placeholder = createBreakElement(document());
appendNode(placeholder, blockquote);
setEndingSelection(VisibleSelection(positionBeforeNode(placeholder.get()), DOWNSTREAM));
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);
endOfCurrentParagraph = end;
Position afterEnd = end.next();
Node* enclosingCell = enclosingNodeOfType(start, &isTableCell);
VisiblePosition endOfNextParagraph = endOfNextParagrahSplittingTextNodesIfNeeded(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 = 0;
// 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()->inDocument())
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()->inDocument()) {
ASSERT_NOT_REACHED();
return;
}
endOfCurrentParagraph = endOfNextParagraph;
}
}
static bool isNewLineAtPosition(const Position& position)
{
if (position.anchorType() != Position::PositionIsOffsetInAnchor)
return false;
Node* textNode = position.containerNode();
int offset = position.offsetInContainerNode();
if (!textNode || !textNode->isTextNode() || offset < 0 || offset >= textNode->maxCharacterOffset())
return false;
ExceptionCode ec = 0;
String textAtPosition = static_cast<Text*>(textNode)->substringData(offset, 1, ec);
if (ec)
return false;
return textAtPosition[0] == '\n';
}
static RenderStyle* renderStyleOfEnclosingTextNode(const Position& position)
{
if (position.anchorType() != Position::PositionIsOffsetInAnchor
|| !position.containerNode()
|| !position.containerNode()->isTextNode()
|| !position.containerNode()->renderer())
return 0;
return position.containerNode()->renderer()->style();
}
void ApplyBlockElementCommand::rangeForParagraphSplittingTextNodesIfNeeded(const VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
{
start = startOfParagraph(endOfCurrentParagraph).deepEquivalent();
end = endOfCurrentParagraph.deepEquivalent();
RenderStyle* startStyle = renderStyleOfEnclosingTextNode(start);
bool isStartAndEndOnSameNode = false;
if (startStyle) {
isStartAndEndOnSameNode = renderStyleOfEnclosingTextNode(end) && start.deprecatedNode() == end.deprecatedNode();
bool isStartAndEndOfLastParagraphOnSameNode = renderStyleOfEnclosingTextNode(m_endOfLastParagraph) && start.deprecatedNode() == m_endOfLastParagraph.deprecatedNode();
// Avoid obtanining the start of next paragraph for start
if (startStyle->preserveNewline() && 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 (!startStyle->collapseWhiteSpace() && start.offsetInContainerNode() > 0) {
int startOffset = start.offsetInContainerNode();
splitTextNode(static_cast<Text*>(start.deprecatedNode()), startOffset);
start = firstPositionInOrBeforeNode(start.deprecatedNode());
if (isStartAndEndOnSameNode) {
ASSERT(end.offsetInContainerNode() >= startOffset);
end = Position(end.deprecatedNode(), end.offsetInContainerNode() - startOffset, Position::PositionIsOffsetInAnchor);
}
if (isStartAndEndOfLastParagraphOnSameNode) {
ASSERT(m_endOfLastParagraph.offsetInContainerNode() >= startOffset);
m_endOfLastParagraph = Position(m_endOfLastParagraph.deprecatedNode(), m_endOfLastParagraph.offsetInContainerNode() - startOffset,
Position::PositionIsOffsetInAnchor);
}
}
}
RenderStyle* endStyle = renderStyleOfEnclosingTextNode(end);
if (endStyle) {
bool isEndAndEndOfLastParagraphOnSameNode = renderStyleOfEnclosingTextNode(m_endOfLastParagraph) && end.deprecatedNode() == m_endOfLastParagraph.deprecatedNode();
// Include \n at the end of line if we're at an empty paragraph
if (endStyle->preserveNewline() && start == end
&& end.offsetInContainerNode() < end.containerNode()->maxCharacterOffset()) {
int endOffset = end.offsetInContainerNode();
if (!isNewLineAtPosition(end.previous()) && isNewLineAtPosition(end))
end = Position(end.deprecatedNode(), endOffset + 1, Position::PositionIsOffsetInAnchor);
if (isEndAndEndOfLastParagraphOnSameNode && end.offsetInContainerNode() >= m_endOfLastParagraph.offsetInContainerNode())
m_endOfLastParagraph = end;
}
// If end is in the middle of a text node, split.
if (!endStyle->collapseWhiteSpace() && end.offsetInContainerNode()
&& end.offsetInContainerNode() < end.containerNode()->maxCharacterOffset()) {
splitTextNode(static_cast<Text*>(end.deprecatedNode()), end.offsetInContainerNode());
if (isStartAndEndOnSameNode)
start = firstPositionInOrBeforeNode(end.deprecatedNode()->previousSibling());
if (isEndAndEndOfLastParagraphOnSameNode) {
if (m_endOfLastParagraph.offsetInContainerNode() == end.offsetInContainerNode())
m_endOfLastParagraph = lastPositionInNode(end.deprecatedNode()->previousSibling());
else
m_endOfLastParagraph = Position(end.deprecatedNode(), m_endOfLastParagraph.offsetInContainerNode() - end.offsetInContainerNode(),
Position::PositionIsOffsetInAnchor);
}
end = lastPositionInNode(end.deprecatedNode()->previousSibling());
}
}
}
VisiblePosition ApplyBlockElementCommand::endOfNextParagrahSplittingTextNodesIfNeeded(VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
{
VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
Position position = endOfNextParagraph.deepEquivalent();
RenderStyle* style = renderStyleOfEnclosingTextNode(position);
if (!style)
return endOfNextParagraph;
RefPtr<Node> containerNode = position.containerNode();
if (!style->preserveNewline() || !position.offsetInContainerNode()
|| !isNewLineAtPosition(Position(containerNode.get(), 0, Position::PositionIsOffsetInAnchor)))
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(static_cast<Text*>(containerNode.get()), 1);
if (start.anchorType() == Position::PositionIsOffsetInAnchor && containerNode.get() == start.containerNode()) {
ASSERT(start.offsetInContainerNode() < position.offsetInContainerNode());
start = Position(containerNode->previousSibling(), start.offsetInContainerNode(), Position::PositionIsOffsetInAnchor);
}
if (end.anchorType() == Position::PositionIsOffsetInAnchor && containerNode.get() == end.containerNode()) {
ASSERT(end.offsetInContainerNode() < position.offsetInContainerNode());
end = Position(containerNode->previousSibling(), end.offsetInContainerNode(), Position::PositionIsOffsetInAnchor);
}
if (m_endOfLastParagraph.anchorType() == Position::PositionIsOffsetInAnchor && containerNode.get() == m_endOfLastParagraph.containerNode()) {
if (m_endOfLastParagraph.offsetInContainerNode() < position.offsetInContainerNode())
m_endOfLastParagraph = Position(containerNode->previousSibling(), m_endOfLastParagraph.offsetInContainerNode(), Position::PositionIsOffsetInAnchor);
else
m_endOfLastParagraph = Position(containerNode, m_endOfLastParagraph.offsetInContainerNode() - 1, Position::PositionIsOffsetInAnchor);
}
return Position(containerNode.get(), position.offsetInContainerNode() - 1, Position::PositionIsOffsetInAnchor);
}
PassRefPtr<Element> ApplyBlockElementCommand::createBlockElement() const
{
RefPtr<Element> element = createHTMLElement(document(), m_tagName);
if (m_className.length())
element->setAttribute(classAttr, m_className);
if (m_inlineStyle.length())
element->setAttribute(styleAttr, m_inlineStyle);
return element.release();
}
}
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