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/*
* Copyright (C) 2005 Apple 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 APPLE INC. ``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 APPLE INC. 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 "InsertTextCommand.h"
#include "Document.h"
#include "Editing.h"
#include "Editor.h"
#include "Frame.h"
#include "HTMLElement.h"
#include "HTMLInterchange.h"
#include "Text.h"
#include "VisibleUnits.h"
namespace WebCore {
InsertTextCommand::InsertTextCommand(Document& document, const String& text, bool selectInsertedText, RebalanceType rebalanceType, EditAction editingAction)
: CompositeEditCommand(document, editingAction)
, m_text(text)
, m_selectInsertedText(selectInsertedText)
, m_rebalanceType(rebalanceType)
{
}
InsertTextCommand::InsertTextCommand(Document& document, const String& text, Ref<TextInsertionMarkerSupplier>&& markerSupplier, EditAction editingAction)
: CompositeEditCommand(document, editingAction)
, m_text(text)
, m_selectInsertedText(false)
, m_rebalanceType(RebalanceLeadingAndTrailingWhitespaces)
, m_markerSupplier(WTFMove(markerSupplier))
{
}
Position InsertTextCommand::positionInsideTextNode(const Position& p)
{
Position pos = p;
if (isTabSpanTextNode(pos.anchorNode())) {
auto textNode = document().createEditingTextNode(emptyString());
auto* textNodePtr = textNode.ptr();
insertNodeAtTabSpanPosition(WTFMove(textNode), pos);
return firstPositionInNode(textNodePtr);
}
// Prepare for text input by looking at the specified position.
// It may be necessary to insert a text node to receive characters.
if (!pos.containerNode()->isTextNode()) {
auto textNode = document().createEditingTextNode(emptyString());
auto* textNodePtr = textNode.ptr();
insertNodeAt(WTFMove(textNode), pos);
return firstPositionInNode(textNodePtr);
}
return pos;
}
void InsertTextCommand::setEndingSelectionWithoutValidation(const Position& startPosition, const Position& endPosition)
{
// We could have inserted a part of composed character sequence,
// so we are basically treating ending selection as a range to avoid validation.
// <http://bugs.webkit.org/show_bug.cgi?id=15781>
VisibleSelection forcedEndingSelection;
forcedEndingSelection.setWithoutValidation(startPosition, endPosition);
forcedEndingSelection.setIsDirectional(endingSelection().isDirectional());
setEndingSelection(forcedEndingSelection);
}
// This avoids the expense of a full fledged delete operation, and avoids a layout that typically results
// from text removal.
bool InsertTextCommand::performTrivialReplace(const String& text, bool selectInsertedText)
{
if (!endingSelection().isRange())
return false;
if (text.contains('\t') || text.contains(' ') || text.contains('\n'))
return false;
Position start = endingSelection().start();
Position endPosition = replaceSelectedTextInNode(text);
if (endPosition.isNull())
return false;
setEndingSelectionWithoutValidation(start, endPosition);
if (!selectInsertedText)
setEndingSelection(VisibleSelection(endingSelection().visibleEnd(), endingSelection().isDirectional()));
return true;
}
bool InsertTextCommand::performOverwrite(const String& text, bool selectInsertedText)
{
Position start = endingSelection().start();
RefPtr<Text> textNode = start.containerText();
if (!textNode)
return false;
unsigned count = std::min(text.length(), textNode->length() - start.offsetInContainerNode());
if (!count)
return false;
replaceTextInNode(*textNode, start.offsetInContainerNode(), count, text);
Position endPosition = Position(textNode.get(), start.offsetInContainerNode() + text.length());
setEndingSelectionWithoutValidation(start, endPosition);
if (!selectInsertedText)
setEndingSelection(VisibleSelection(endingSelection().visibleEnd(), endingSelection().isDirectional()));
return true;
}
void InsertTextCommand::doApply()
{
ASSERT(m_text.find('\n') == notFound);
if (endingSelection().isNoneOrOrphaned())
return;
// Delete the current selection.
// FIXME: This delete operation blows away the typing style.
if (endingSelection().isRange()) {
if (performTrivialReplace(m_text, m_selectInsertedText))
return;
deleteSelection(false, true, true, false, false);
// deleteSelection eventually makes a new endingSelection out of a Position. If that Position doesn't have
// a renderer (e.g. it is on a <frameset> in the DOM), the VisibleSelection cannot be canonicalized to
// anything other than NoSelection. The rest of this function requires a real endingSelection, so bail out.
if (endingSelection().isNone())
return;
} else if (frame().editor().isOverwriteModeEnabled()) {
if (performOverwrite(m_text, m_selectInsertedText))
return;
}
Position startPosition(endingSelection().start());
Position placeholder;
// We want to remove preserved newlines and brs that will collapse (and thus become unnecessary) when content
// is inserted just before them.
// FIXME: We shouldn't really have to do this, but removing placeholders is a workaround for 9661.
// If the caret is just before a placeholder, downstream will normalize the caret to it.
Position downstream(startPosition.downstream());
if (lineBreakExistsAtPosition(downstream)) {
// FIXME: This doesn't handle placeholders at the end of anonymous blocks.
VisiblePosition caret(startPosition);
if (isEndOfBlock(caret) && isStartOfParagraph(caret))
placeholder = downstream;
// Don't remove the placeholder yet, otherwise the block we're inserting into would collapse before
// we get a chance to insert into it. We check for a placeholder now, though, because doing so requires
// the creation of a VisiblePosition, and if we did that post-insertion it would force a layout.
}
// Insert the character at the leftmost candidate.
startPosition = startPosition.upstream();
// It is possible for the node that contains startPosition to contain only unrendered whitespace,
// and so deleteInsignificantText could remove it. Save the position before the node in case that happens.
Position positionBeforeStartNode(positionInParentBeforeNode(startPosition.containerNode()));
deleteInsignificantText(startPosition.upstream(), startPosition.downstream());
if (!startPosition.anchorNode()->isConnected())
startPosition = positionBeforeStartNode;
if (!startPosition.isCandidate())
startPosition = startPosition.downstream();
startPosition = positionAvoidingSpecialElementBoundary(startPosition);
Position endPosition;
if (m_text == "\t") {
endPosition = insertTab(startPosition);
startPosition = endPosition.previous();
if (placeholder.isNotNull())
removePlaceholderAt(placeholder);
} else {
// Make sure the document is set up to receive m_text
startPosition = positionInsideTextNode(startPosition);
ASSERT(startPosition.anchorType() == Position::PositionIsOffsetInAnchor);
ASSERT(startPosition.containerNode());
ASSERT(startPosition.containerNode()->isTextNode());
if (placeholder.isNotNull())
removePlaceholderAt(placeholder);
RefPtr<Text> textNode = startPosition.containerText();
const unsigned offset = startPosition.offsetInContainerNode();
insertTextIntoNode(*textNode, offset, m_text);
endPosition = Position(textNode.get(), offset + m_text.length());
if (m_markerSupplier)
m_markerSupplier->addMarkersToTextNode(textNode.get(), offset, m_text);
if (m_rebalanceType == RebalanceLeadingAndTrailingWhitespaces) {
// The insertion may require adjusting adjacent whitespace, if it is present.
rebalanceWhitespaceAt(endPosition);
// Rebalancing on both sides isn't necessary if we've inserted only spaces.
if (!shouldRebalanceLeadingWhitespaceFor(m_text))
rebalanceWhitespaceAt(startPosition);
} else {
ASSERT(m_rebalanceType == RebalanceAllWhitespaces);
if (canRebalance(startPosition) && canRebalance(endPosition))
rebalanceWhitespaceOnTextSubstring(*textNode, startPosition.offsetInContainerNode(), endPosition.offsetInContainerNode());
}
}
setEndingSelectionWithoutValidation(startPosition, endPosition);
// Handle the case where there is a typing style.
if (RefPtr<EditingStyle> typingStyle = frame().selection().typingStyle()) {
typingStyle->prepareToApplyAt(endPosition, EditingStyle::PreserveWritingDirection);
if (!typingStyle->isEmpty())
applyStyle(typingStyle.get());
}
if (!m_selectInsertedText)
setEndingSelection(VisibleSelection(endingSelection().end(), endingSelection().affinity(), endingSelection().isDirectional()));
}
Position InsertTextCommand::insertTab(const Position& pos)
{
Position insertPos = VisiblePosition(pos, DOWNSTREAM).deepEquivalent();
if (insertPos.isNull())
return pos;
Node* node = insertPos.containerNode();
unsigned int offset = node->isTextNode() ? insertPos.offsetInContainerNode() : 0;
// keep tabs coalesced in tab span
if (isTabSpanTextNode(node)) {
Ref<Text> textNode = downcast<Text>(*node);
insertTextIntoNode(textNode, offset, "\t");
return Position(textNode.ptr(), offset + 1);
}
// create new tab span
auto spanNode = createTabSpanElement(document());
auto* spanNodePtr = spanNode.ptr();
// place it
if (!is<Text>(*node))
insertNodeAt(WTFMove(spanNode), insertPos);
else {
Ref<Text> textNode = downcast<Text>(*node);
if (offset >= textNode->length())
insertNodeAfter(WTFMove(spanNode), textNode);
else {
// split node to make room for the span
// NOTE: splitTextNode uses textNode for the
// second node in the split, so we need to
// insert the span before it.
if (offset > 0)
splitTextNode(textNode, offset);
insertNodeBefore(WTFMove(spanNode), textNode);
}
}
// return the position following the new tab
return lastPositionInNode(spanNodePtr);
}
}