blob: 43aeb39a48ff566662344746cbb7e801fa71d36e [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003-2018 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CharacterData.h"
#include "Attr.h"
#include "ElementTraversal.h"
#include "EventNames.h"
#include "FrameSelection.h"
#include "InspectorInstrumentation.h"
#include "MutationEvent.h"
#include "MutationObserverInterestGroup.h"
#include "MutationRecord.h"
#include "ProcessingInstruction.h"
#include "RenderText.h"
#include "StyleInheritedData.h"
#include <unicode/ubrk.h>
#include <wtf/IsoMallocInlines.h>
#include <wtf/Ref.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(CharacterData);
static bool canUseSetDataOptimization(const CharacterData& node)
{
auto& document = node.document();
return !document.hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER) && !document.hasMutationObserversOfType(MutationObserver::CharacterData)
&& !document.hasListenerType(Document::DOMSUBTREEMODIFIED_LISTENER);
}
void CharacterData::setData(const String& data)
{
const String& nonNullData = !data.isNull() ? data : emptyString();
unsigned oldLength = length();
if (m_data == nonNullData && canUseSetDataOptimization(*this)) {
document().textRemoved(this, 0, oldLength);
if (document().frame())
document().frame()->selection().textWasReplaced(this, 0, oldLength, oldLength);
return;
}
Ref<CharacterData> protectedThis(*this);
setDataAndUpdate(nonNullData, 0, oldLength, nonNullData.length());
document().textRemoved(this, 0, oldLength);
}
ExceptionOr<String> CharacterData::substringData(unsigned offset, unsigned count)
{
if (offset > length())
return Exception { IndexSizeError };
return m_data.substring(offset, count);
}
unsigned CharacterData::parserAppendData(const String& string, unsigned offset, unsigned lengthLimit)
{
unsigned oldLength = m_data.length();
ASSERT(lengthLimit >= oldLength);
unsigned characterLength = string.length() - offset;
unsigned characterLengthLimit = std::min(characterLength, lengthLimit - oldLength);
// Check that we are not on an unbreakable boundary.
// Some text break iterator implementations work best if the passed buffer is as small as possible,
// see <https://bugs.webkit.org/show_bug.cgi?id=29092>.
// We need at least two characters look-ahead to account for UTF-16 surrogates.
if (characterLengthLimit < characterLength) {
NonSharedCharacterBreakIterator it(StringView(string).substring(offset, (characterLengthLimit + 2 > characterLength) ? characterLength : characterLengthLimit + 2));
if (!ubrk_isBoundary(it, characterLengthLimit))
characterLengthLimit = ubrk_preceding(it, characterLengthLimit);
}
if (!characterLengthLimit)
return 0;
if (string.is8Bit())
m_data.append(string.characters8() + offset, characterLengthLimit);
else
m_data.append(string.characters16() + offset, characterLengthLimit);
ASSERT(!renderer() || is<Text>(*this));
if (is<Text>(*this) && parentNode())
downcast<Text>(*this).updateRendererAfterContentChange(oldLength, 0);
notifyParentAfterChange(ContainerNode::ChildChangeSource::Parser);
return characterLengthLimit;
}
void CharacterData::appendData(const String& data)
{
String newStr = m_data;
newStr.append(data);
setDataAndUpdate(newStr, m_data.length(), 0, data.length());
// FIXME: Should we call textInserted here?
}
ExceptionOr<void> CharacterData::insertData(unsigned offset, const String& data)
{
if (offset > length())
return Exception { IndexSizeError };
String newStr = m_data;
newStr.insert(data, offset);
setDataAndUpdate(newStr, offset, 0, data.length());
document().textInserted(this, offset, data.length());
return { };
}
ExceptionOr<void> CharacterData::deleteData(unsigned offset, unsigned count)
{
if (offset > length())
return Exception { IndexSizeError };
count = std::min(count, length() - offset);
String newStr = m_data;
newStr.remove(offset, count);
setDataAndUpdate(newStr, offset, count, 0);
document().textRemoved(this, offset, count);
return { };
}
ExceptionOr<void> CharacterData::replaceData(unsigned offset, unsigned count, const String& data)
{
if (offset > length())
return Exception { IndexSizeError };
count = std::min(count, length() - offset);
String newStr = m_data;
newStr.remove(offset, count);
newStr.insert(data, offset);
setDataAndUpdate(newStr, offset, count, data.length());
// update the markers for spell checking and grammar checking
document().textRemoved(this, offset, count);
document().textInserted(this, offset, data.length());
return { };
}
String CharacterData::nodeValue() const
{
return m_data;
}
ExceptionOr<void> CharacterData::setNodeValue(const String& nodeValue)
{
setData(nodeValue);
return { };
}
void CharacterData::setDataAndUpdate(const String& newData, unsigned offsetOfReplacedData, unsigned oldLength, unsigned newLength)
{
String oldData = m_data;
m_data = newData;
ASSERT(!renderer() || is<Text>(*this));
if (is<Text>(*this) && parentNode())
downcast<Text>(*this).updateRendererAfterContentChange(offsetOfReplacedData, oldLength);
if (is<ProcessingInstruction>(*this))
downcast<ProcessingInstruction>(*this).checkStyleSheet();
if (document().frame())
document().frame()->selection().textWasReplaced(this, offsetOfReplacedData, oldLength, newLength);
notifyParentAfterChange(ContainerNode::ChildChangeSource::API);
dispatchModifiedEvent(oldData);
}
void CharacterData::notifyParentAfterChange(ContainerNode::ChildChangeSource source)
{
document().incDOMTreeVersion();
if (!parentNode())
return;
ContainerNode::ChildChange change = {
ContainerNode::TextChanged,
ElementTraversal::previousSibling(*this),
ElementTraversal::nextSibling(*this),
source
};
parentNode()->childrenChanged(change);
}
void CharacterData::dispatchModifiedEvent(const String& oldData)
{
if (auto mutationRecipients = MutationObserverInterestGroup::createForCharacterDataMutation(*this))
mutationRecipients->enqueueMutationRecord(MutationRecord::createCharacterData(*this, oldData));
if (!isInShadowTree()) {
if (document().hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER))
dispatchScopedEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, true, nullptr, oldData, m_data));
dispatchSubtreeModifiedEvent();
}
InspectorInstrumentation::characterDataModified(document(), *this);
}
int CharacterData::maxCharacterOffset() const
{
return static_cast<int>(length());
}
bool CharacterData::offsetInCharacters() const
{
return true;
}
} // namespace WebCore