277 lines
8.2 KiB
C++
277 lines
8.2 KiB
C++
/*
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 1999 Antti Koivisto (koivisto@kde.org)
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* Copyright (C) 2003-2018 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "Text.h"
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#include "Event.h"
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#include "RenderCombineText.h"
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#include "RenderSVGInlineText.h"
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#include "RenderText.h"
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#include "SVGElement.h"
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#include "SVGNames.h"
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#include "ScopedEventQueue.h"
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#include "ShadowRoot.h"
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#include "StyleInheritedData.h"
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#include "StyleResolver.h"
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#include "StyleUpdate.h"
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#include "TextManipulationController.h"
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#include "TextNodeTraversal.h"
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#include <wtf/CheckedArithmetic.h>
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#include <wtf/IsoMallocInlines.h>
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#include <wtf/text/CString.h>
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#include <wtf/text/StringBuilder.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(Text);
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Ref<Text> Text::create(Document& document, const String& data)
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{
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return adoptRef(*new Text(document, data, CreateText));
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}
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Ref<Text> Text::createEditingText(Document& document, const String& data)
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{
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return adoptRef(*new Text(document, data, CreateEditingText));
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}
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Text::~Text() = default;
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ExceptionOr<Ref<Text>> Text::splitText(unsigned offset)
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{
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if (offset > length())
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return Exception { IndexSizeError };
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EventQueueScope scope;
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auto oldData = data();
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auto newText = virtualCreate(oldData.substring(offset));
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setDataWithoutUpdate(oldData.substring(0, offset));
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dispatchModifiedEvent(oldData);
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if (auto* parent = parentNode()) {
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auto insertResult = parent->insertBefore(newText, nextSibling());
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if (insertResult.hasException())
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return insertResult.releaseException();
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}
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document().textNodeSplit(*this);
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updateRendererAfterContentChange(0, oldData.length());
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return newText;
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}
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static const Text* earliestLogicallyAdjacentTextNode(const Text* text)
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{
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const Node* node = text;
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while ((node = node->previousSibling())) {
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if (!is<Text>(*node))
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break;
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text = downcast<Text>(node);
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}
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return text;
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}
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static const Text* latestLogicallyAdjacentTextNode(const Text* text)
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{
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const Node* node = text;
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while ((node = node->nextSibling())) {
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if (!is<Text>(*node))
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break;
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text = downcast<Text>(node);
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}
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return text;
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}
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String Text::wholeText() const
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{
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const Text* startText = earliestLogicallyAdjacentTextNode(this);
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const Text* endText = latestLogicallyAdjacentTextNode(this);
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ASSERT(endText);
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const Node* onePastEndText = TextNodeTraversal::nextSibling(*endText);
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StringBuilder result;
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for (const Text* text = startText; text != onePastEndText; text = TextNodeTraversal::nextSibling(*text))
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result.append(text->data());
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return result.toString();
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}
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RefPtr<Text> Text::replaceWholeText(const String& newText)
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{
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// Remove all adjacent text nodes, and replace the contents of this one.
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// Protect startText and endText against mutation event handlers removing the last ref
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RefPtr<Text> startText = const_cast<Text*>(earliestLogicallyAdjacentTextNode(this));
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RefPtr<Text> endText = const_cast<Text*>(latestLogicallyAdjacentTextNode(this));
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RefPtr<Text> protectedThis(this); // Mutation event handlers could cause our last ref to go away
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RefPtr<ContainerNode> parent = parentNode(); // Protect against mutation handlers moving this node during traversal
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for (RefPtr<Node> n = startText; n && n != this && n->isTextNode() && n->parentNode() == parent;) {
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Ref<Node> nodeToRemove(n.releaseNonNull());
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n = nodeToRemove->nextSibling();
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parent->removeChild(nodeToRemove);
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}
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if (this != endText) {
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Node* onePastEndText = endText->nextSibling();
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for (RefPtr<Node> n = nextSibling(); n && n != onePastEndText && n->isTextNode() && n->parentNode() == parent;) {
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Ref<Node> nodeToRemove(n.releaseNonNull());
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n = nodeToRemove->nextSibling();
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parent->removeChild(nodeToRemove);
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}
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}
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if (newText.isEmpty()) {
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if (parent && parentNode() == parent)
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parent->removeChild(*this);
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return nullptr;
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}
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setData(newText);
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return protectedThis;
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}
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String Text::nodeName() const
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{
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return "#text"_s;
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}
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Node::NodeType Text::nodeType() const
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{
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return TEXT_NODE;
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}
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Ref<Node> Text::cloneNodeInternal(Document& targetDocument, CloningOperation)
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{
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return create(targetDocument, data());
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}
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static bool isSVGShadowText(Text* text)
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{
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Node* parentNode = text->parentNode();
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ASSERT(parentNode);
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return is<ShadowRoot>(*parentNode) && downcast<ShadowRoot>(*parentNode).host()->hasTagName(SVGNames::trefTag);
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}
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static bool isSVGText(Text* text)
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{
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Node* parentOrShadowHostNode = text->parentOrShadowHostNode();
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return parentOrShadowHostNode->isSVGElement() && !parentOrShadowHostNode->hasTagName(SVGNames::foreignObjectTag);
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}
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RenderPtr<RenderText> Text::createTextRenderer(const RenderStyle& style)
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{
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if (isSVGText(this) || isSVGShadowText(this))
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return createRenderer<RenderSVGInlineText>(*this, data());
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if (style.hasTextCombine())
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return createRenderer<RenderCombineText>(*this, data());
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return createRenderer<RenderText>(*this, data());
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}
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bool Text::childTypeAllowed(NodeType) const
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{
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return false;
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}
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Ref<Text> Text::virtualCreate(const String& data)
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{
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return create(document(), data);
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}
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Ref<Text> Text::createWithLengthLimit(Document& document, const String& data, unsigned start, unsigned lengthLimit)
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{
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unsigned dataLength = data.length();
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if (!start && dataLength <= lengthLimit)
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return create(document, data);
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Ref<Text> result = Text::create(document, String());
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result->parserAppendData(data, start, lengthLimit);
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return result;
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}
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void Text::updateRendererAfterContentChange(unsigned offsetOfReplacedData, unsigned lengthOfReplacedData)
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{
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if (!isConnected())
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return;
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if (styleValidity() >= Style::Validity::SubtreeAndRenderersInvalid)
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return;
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document().updateTextRenderer(*this, offsetOfReplacedData, lengthOfReplacedData);
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}
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static void appendTextRepresentation(StringBuilder& builder, const Text& text)
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{
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String value = text.data();
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builder.append(" length="_s, value.length());
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value.replaceWithLiteral('\\', "\\\\");
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value.replaceWithLiteral('\n', "\\n");
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const size_t maxDumpLength = 30;
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if (value.length() > maxDumpLength) {
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value.truncate(maxDumpLength - 10);
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value.append("..."_s);
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}
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builder.append(" \"", value, '\"');
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}
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String Text::description() const
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{
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StringBuilder builder;
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builder.append(CharacterData::description());
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appendTextRepresentation(builder, *this);
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return builder.toString();
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}
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String Text::debugDescription() const
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{
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StringBuilder builder;
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builder.append(CharacterData::debugDescription());
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appendTextRepresentation(builder, *this);
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return builder.toString();
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}
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void Text::setDataAndUpdate(const String& newData, unsigned offsetOfReplacedData, unsigned oldLength, unsigned newLength, UpdateLiveRanges updateLiveRanges)
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{
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auto oldData = data();
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CharacterData::setDataAndUpdate(newData, offsetOfReplacedData, oldLength, newLength, updateLiveRanges);
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// FIXME: Does not seem correct to do this for 0 offset only.
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if (!offsetOfReplacedData) {
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auto* textManipulationController = document().textManipulationControllerIfExists();
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if (UNLIKELY(textManipulationController && oldData != newData))
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textManipulationController->didUpdateContentForText(*this);
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}
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}
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} // namespace WebCore
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