blob: 2d5d6d30ff46e20dc8c1995da0b12ab5249cd882 [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 "core/dom/Text.h"
#include "SVGNames.h"
#include "bindings/v8/ExceptionMessages.h"
#include "bindings/v8/ExceptionState.h"
#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/NodeRenderStyle.h"
#include "core/dom/NodeRenderingContext.h"
#include "core/dom/NodeTraversal.h"
#include "core/events/ScopedEventQueue.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/rendering/RenderCombineText.h"
#include "core/rendering/RenderText.h"
#include "core/rendering/svg/RenderSVGInlineText.h"
#include "wtf/text/CString.h"
#include "wtf/text/StringBuilder.h"
using namespace std;
namespace WebCore {
PassRefPtr<Text> Text::create(Document& document, const String& data)
{
return adoptRef(new Text(document, data, CreateText));
}
PassRefPtr<Text> Text::createEditingText(Document& document, const String& data)
{
return adoptRef(new Text(document, data, CreateEditingText));
}
PassRefPtr<Node> Text::mergeNextSiblingNodesIfPossible()
{
RefPtr<Node> protect(this);
// Remove empty text nodes.
if (!length()) {
// Care must be taken to get the next node before removing the current node.
RefPtr<Node> nextNode(NodeTraversal::nextPostOrder(this));
remove(IGNORE_EXCEPTION);
return nextNode.release();
}
// Merge text nodes.
while (Node* nextSibling = this->nextSibling()) {
if (nextSibling->nodeType() != TEXT_NODE)
break;
RefPtr<Text> nextText = toText(nextSibling);
// Remove empty text nodes.
if (!nextText->length()) {
nextText->remove(IGNORE_EXCEPTION);
continue;
}
// Both non-empty text nodes. Merge them.
unsigned offset = length();
String nextTextData = nextText->data();
String oldTextData = data();
setDataWithoutUpdate(data() + nextTextData);
updateTextRenderer(oldTextData.length(), 0);
// Empty nextText for layout update.
nextText->setDataWithoutUpdate(emptyString());
document().didMergeTextNodes(nextText.get(), offset);
// Restore nextText for mutation event.
nextText->setDataWithoutUpdate(nextTextData);
document().incDOMTreeVersion();
didModifyData(oldTextData);
nextText->remove(IGNORE_EXCEPTION);
}
return NodeTraversal::nextPostOrder(this);
}
PassRefPtr<Text> Text::splitText(unsigned offset, ExceptionState& es)
{
// IndexSizeError: Raised if the specified offset is negative or greater than
// the number of 16-bit units in data.
if (offset > length()) {
es.throwDOMException(IndexSizeError, ExceptionMessages::failedToExecute("splitText", "Text", "The offset " + String::number(offset) + " is larger than the Text node's length."));
return 0;
}
EventQueueScope scope;
String oldStr = data();
RefPtr<Text> newText = cloneWithData(oldStr.substring(offset));
setDataWithoutUpdate(oldStr.substring(0, offset));
didModifyData(oldStr);
if (parentNode())
parentNode()->insertBefore(newText.get(), nextSibling(), es);
if (es.hadException())
return 0;
if (renderer())
toRenderText(renderer())->setTextWithOffset(dataImpl(), 0, oldStr.length());
if (parentNode())
document().didSplitTextNode(this);
return newText.release();
}
static const Text* earliestLogicallyAdjacentTextNode(const Text* t)
{
const Node* n = t;
while ((n = n->previousSibling())) {
Node::NodeType type = n->nodeType();
if (type == Node::TEXT_NODE || type == Node::CDATA_SECTION_NODE) {
t = toText(n);
continue;
}
break;
}
return t;
}
static const Text* latestLogicallyAdjacentTextNode(const Text* t)
{
const Node* n = t;
while ((n = n->nextSibling())) {
Node::NodeType type = n->nodeType();
if (type == Node::TEXT_NODE || type == Node::CDATA_SECTION_NODE) {
t = toText(n);
continue;
}
break;
}
return t;
}
String Text::wholeText() const
{
const Text* startText = earliestLogicallyAdjacentTextNode(this);
const Text* endText = latestLogicallyAdjacentTextNode(this);
Node* onePastEndText = endText->nextSibling();
unsigned resultLength = 0;
for (const Node* n = startText; n != onePastEndText; n = n->nextSibling()) {
if (!n->isTextNode())
continue;
const String& data = toText(n)->data();
if (std::numeric_limits<unsigned>::max() - data.length() < resultLength)
CRASH();
resultLength += data.length();
}
StringBuilder result;
result.reserveCapacity(resultLength);
for (const Node* n = startText; n != onePastEndText; n = n->nextSibling()) {
if (!n->isTextNode())
continue;
result.append(toText(n)->data());
}
ASSERT(result.length() == resultLength);
return result.toString();
}
PassRefPtr<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;) {
RefPtr<Node> nodeToRemove(n.release());
n = nodeToRemove->nextSibling();
parent->removeChild(nodeToRemove.get(), IGNORE_EXCEPTION);
}
if (this != endText) {
Node* onePastEndText = endText->nextSibling();
for (RefPtr<Node> n = nextSibling(); n && n != onePastEndText && n->isTextNode() && n->parentNode() == parent;) {
RefPtr<Node> nodeToRemove(n.release());
n = nodeToRemove->nextSibling();
parent->removeChild(nodeToRemove.get(), IGNORE_EXCEPTION);
}
}
if (newText.isEmpty()) {
if (parent && parentNode() == parent)
parent->removeChild(this, IGNORE_EXCEPTION);
return 0;
}
setData(newText);
return protectedThis.release();
}
String Text::nodeName() const
{
return textAtom.string();
}
Node::NodeType Text::nodeType() const
{
return TEXT_NODE;
}
PassRefPtr<Node> Text::cloneNode(bool /*deep*/)
{
return cloneWithData(data());
}
bool Text::textRendererIsNeeded(const NodeRenderingContext& context)
{
if (isEditingText())
return true;
if (!length())
return false;
if (context.style()->display() == NONE)
return false;
if (!containsOnlyWhitespace())
return true;
RenderObject* parent = context.parentRenderer();
if (!parent->canHaveWhitespaceChildren())
return false;
if (context.style()->preserveNewline()) // pre/pre-wrap/pre-line always make renderers.
return true;
RenderObject* prev = context.previousRenderer();
if (prev && prev->isBR()) // <span><br/> <br/></span>
return false;
if (parent->isRenderInline()) {
// <span><div/> <div/></span>
if (prev && !prev->isInline())
return false;
} else {
if (parent->isRenderBlock() && !parent->childrenInline() && (!prev || !prev->isInline()))
return false;
// Avoiding creation of a Renderer for the text node is a non-essential memory optimization.
// So to avoid blowing up on very wide DOMs, we limit the number of siblings to visit.
unsigned maxSiblingsToVisit = 50;
RenderObject* first = parent->firstChild();
while (first && first->isFloatingOrOutOfFlowPositioned() && maxSiblingsToVisit--)
first = first->nextSibling();
if (!first || context.nextRenderer() == first)
// Whitespace at the start of a block just goes away. Don't even
// make a render object for this text.
return false;
}
return true;
}
static bool isSVGText(Text* text)
{
Node* parentOrShadowHostNode = text->parentOrShadowHostNode();
return parentOrShadowHostNode->isSVGElement() && !parentOrShadowHostNode->hasTagName(SVGNames::foreignObjectTag);
}
RenderText* Text::createTextRenderer(RenderStyle* style)
{
if (isSVGText(this))
return new RenderSVGInlineText(this, dataImpl());
if (style->hasTextCombine())
return new RenderCombineText(this, dataImpl());
return new RenderText(this, dataImpl());
}
void Text::attach(const AttachContext& context)
{
NodeRenderingContext(this, context.resolvedStyle).createRendererForTextIfNeeded();
CharacterData::attach(context);
}
bool Text::recalcTextStyle(StyleRecalcChange change)
{
if (RenderText* renderer = toRenderText(this->renderer())) {
if (change != NoChange || needsStyleRecalc())
renderer->setStyle(document().styleResolver()->styleForText(this));
if (needsStyleRecalc())
renderer->setText(dataImpl());
clearNeedsStyleRecalc();
} else if (needsStyleRecalc() || needsWhitespaceRenderer()) {
reattach();
return true;
}
return false;
}
// If a whitespace node had no renderer and goes through a recalcStyle it may
// need to create one if the parent style now has white-space: pre.
bool Text::needsWhitespaceRenderer()
{
ASSERT(!renderer());
if (RenderStyle* style = parentRenderStyle())
return style->preserveNewline();
return false;
}
void Text::updateTextRenderer(unsigned offsetOfReplacedData, unsigned lengthOfReplacedData, RecalcStyleBehavior recalcStyleBehavior)
{
if (!inActiveDocument())
return;
RenderText* textRenderer = toRenderText(renderer());
if (!textRenderer || !textRendererIsNeeded(NodeRenderingContext(this, textRenderer->style()))) {
lazyReattachIfAttached();
// FIXME: Editing should be updated so this is not neccesary.
if (recalcStyleBehavior == DeprecatedRecalcStyleImmediatlelyForEditing)
document().updateStyleIfNeeded();
return;
}
textRenderer->setTextWithOffset(dataImpl(), offsetOfReplacedData, lengthOfReplacedData);
}
bool Text::childTypeAllowed(NodeType) const
{
return false;
}
PassRefPtr<Text> Text::cloneWithData(const String& data)
{
return create(document(), data);
}
#ifndef NDEBUG
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("value=");
result.append(s);
}
strncpy(buffer, result.toString().utf8().data(), length - 1);
}
#endif
} // namespace WebCore