blob: 7315d16928152c4f03d094aec96509f69f202050 [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 "Text.h"
#include "Event.h"
#include "RenderCombineText.h"
#include "RenderSVGInlineText.h"
#include "RenderText.h"
#include "SVGElement.h"
#include "SVGNames.h"
#include "ScopedEventQueue.h"
#include "ShadowRoot.h"
#include "StyleInheritedData.h"
#include "StyleResolver.h"
#include "StyleUpdate.h"
#include "TextNodeTraversal.h"
#include <wtf/CheckedArithmetic.h>
#include <wtf/IsoMallocInlines.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(Text);
Ref<Text> Text::create(Document& document, const String& data)
{
return adoptRef(*new Text(document, data, CreateText));
}
Ref<Text> Text::createEditingText(Document& document, const String& data)
{
return adoptRef(*new Text(document, data, CreateEditingText));
}
Text::~Text() = default;
ExceptionOr<Ref<Text>> Text::splitText(unsigned offset)
{
if (offset > length())
return Exception { IndexSizeError };
EventQueueScope scope;
auto oldData = data();
auto newText = virtualCreate(oldData.substring(offset));
setDataWithoutUpdate(oldData.substring(0, offset));
dispatchModifiedEvent(oldData);
if (auto* parent = parentNode()) {
auto insertResult = parent->insertBefore(newText, nextSibling());
if (insertResult.hasException())
return insertResult.releaseException();
}
document().textNodeSplit(this);
if (renderer())
renderer()->setTextWithOffset(data(), 0, oldData.length());
return WTFMove(newText);
}
static const Text* earliestLogicallyAdjacentTextNode(const Text* text)
{
const Node* node = text;
while ((node = node->previousSibling())) {
if (!is<Text>(*node))
break;
text = downcast<Text>(node);
}
return text;
}
static const Text* latestLogicallyAdjacentTextNode(const Text* text)
{
const Node* node = text;
while ((node = node->nextSibling())) {
if (!is<Text>(*node))
break;
text = downcast<Text>(node);
}
return text;
}
String Text::wholeText() const
{
const Text* startText = earliestLogicallyAdjacentTextNode(this);
const Text* endText = latestLogicallyAdjacentTextNode(this);
ASSERT(endText);
const Node* onePastEndText = TextNodeTraversal::nextSibling(*endText);
StringBuilder result;
for (const Text* text = startText; text != onePastEndText; text = TextNodeTraversal::nextSibling(*text))
result.append(text->data());
return result.toString();
}
RefPtr<Text> Text::replaceWholeText(const String& newText)
{
// Remove all adjacent text nodes, and replace the contents of this one.
// Protect startText and endText against mutation event handlers removing the last ref
RefPtr<Text> startText = const_cast<Text*>(earliestLogicallyAdjacentTextNode(this));
RefPtr<Text> endText = const_cast<Text*>(latestLogicallyAdjacentTextNode(this));
RefPtr<Text> protectedThis(this); // Mutation event handlers could cause our last ref to go away
RefPtr<ContainerNode> parent = parentNode(); // Protect against mutation handlers moving this node during traversal
for (RefPtr<Node> n = startText; n && n != this && n->isTextNode() && n->parentNode() == parent;) {
Ref<Node> nodeToRemove(n.releaseNonNull());
n = nodeToRemove->nextSibling();
parent->removeChild(nodeToRemove);
}
if (this != endText) {
Node* onePastEndText = endText->nextSibling();
for (RefPtr<Node> n = nextSibling(); n && n != onePastEndText && n->isTextNode() && n->parentNode() == parent;) {
Ref<Node> nodeToRemove(n.releaseNonNull());
n = nodeToRemove->nextSibling();
parent->removeChild(nodeToRemove);
}
}
if (newText.isEmpty()) {
if (parent && parentNode() == parent)
parent->removeChild(*this);
return nullptr;
}
setData(newText);
return protectedThis;
}
String Text::nodeName() const
{
return ASCIILiteral("#text");
}
Node::NodeType Text::nodeType() const
{
return TEXT_NODE;
}
Ref<Node> Text::cloneNodeInternal(Document& targetDocument, CloningOperation)
{
return create(targetDocument, data());
}
static bool isSVGShadowText(Text* text)
{
Node* parentNode = text->parentNode();
ASSERT(parentNode);
return is<ShadowRoot>(*parentNode) && downcast<ShadowRoot>(*parentNode).host()->hasTagName(SVGNames::trefTag);
}
static bool isSVGText(Text* text)
{
Node* parentOrShadowHostNode = text->parentOrShadowHostNode();
return parentOrShadowHostNode->isSVGElement() && !parentOrShadowHostNode->hasTagName(SVGNames::foreignObjectTag);
}
RenderPtr<RenderText> Text::createTextRenderer(const RenderStyle& style)
{
if (isSVGText(this) || isSVGShadowText(this))
return createRenderer<RenderSVGInlineText>(*this, data());
if (style.hasTextCombine())
return createRenderer<RenderCombineText>(*this, data());
return createRenderer<RenderText>(*this, data());
}
bool Text::childTypeAllowed(NodeType) const
{
return false;
}
Ref<Text> Text::virtualCreate(const String& data)
{
return create(document(), data);
}
Ref<Text> Text::createWithLengthLimit(Document& document, const String& data, unsigned start, unsigned lengthLimit)
{
unsigned dataLength = data.length();
if (!start && dataLength <= lengthLimit)
return create(document, data);
Ref<Text> result = Text::create(document, String());
result->parserAppendData(data, start, lengthLimit);
return result;
}
void Text::updateRendererAfterContentChange(unsigned offsetOfReplacedData, unsigned lengthOfReplacedData)
{
ASSERT(parentNode());
if (styleValidity() >= Style::Validity::SubtreeAndRenderersInvalid)
return;
document().updateTextRenderer(*this, offsetOfReplacedData, lengthOfReplacedData);
}
#if ENABLE(TREE_DEBUGGING)
void Text::formatForDebugger(char* buffer, unsigned length) const
{
StringBuilder result;
String s;
result.append(nodeName());
s = data();
if (s.length() > 0) {
if (result.length())
result.appendLiteral("; ");
result.appendLiteral("length=");
result.appendNumber(s.length());
result.appendLiteral("; value=\"");
result.append(s);
result.append('"');
}
strncpy(buffer, result.toString().utf8().data(), length - 1);
buffer[length - 1] = '\0';
}
#endif
} // namespace WebCore