/*
* 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 "Text.h"
#include "CString.h"
#include "ExceptionCode.h"
#include "RenderText.h"
#include "TextBreakIterator.h"
#if ENABLE(SVG)
#include "RenderSVGInlineText.h"
#include "SVGNames.h"
#endif
#if ENABLE(WML)
#include "WMLDocument.h"
#include "WMLVariables.h"
#endif
using namespace std;
namespace WebCore {
Text::Text(Document* document, const String& data)
: CharacterData(document, data, CreateText)
{
}
PassRefPtr<Text> Text::create(Document* document, const String& data)
{
return adoptRef(new Text(document, data));
}
PassRefPtr<Text> Text::splitText(unsigned offset, ExceptionCode& ec)
{
ec = 0;
// INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than
// the number of 16-bit units in data.
if (offset > length()) {
ec = INDEX_SIZE_ERR;
return 0;
}
RefPtr<StringImpl> oldStr = dataImpl();
RefPtr<Text> newText = virtualCreate(oldStr->substring(offset));
setDataImpl(oldStr->substring(0, offset));
dispatchModifiedEvent(oldStr.get());
if (parentNode())
parentNode()->insertBefore(newText.get(), nextSibling(), ec);
if (ec)
return 0;
if (parentNode())
document()->textNodeSplit(this);
if (renderer())
toRenderText(renderer())->setTextWithOffset(dataImpl(), 0, oldStr->length());
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 = static_cast<const Text*>(n);
continue;
}
// We would need to visit EntityReference child text nodes if they existed
ASSERT(type != Node::ENTITY_REFERENCE_NODE || !n->hasChildNodes());
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 = static_cast<const Text*>(n);
continue;
}
// We would need to visit EntityReference child text nodes if they existed
ASSERT(type != Node::ENTITY_REFERENCE_NODE || !n->hasChildNodes());
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 Text* t = static_cast<const Text*>(n);
const String& data = t->data();
if (std::numeric_limits<unsigned>::max() - data.length() < resultLength)
CRASH();
resultLength += data.length();
}
UChar* resultData;
String result = String::createUninitialized(resultLength, resultData);
UChar* p = resultData;
for (const Node* n = startText; n != onePastEndText; n = n->nextSibling()) {
if (!n->isTextNode())
continue;
const Text* t = static_cast<const Text*>(n);
const String& data = t->data();
unsigned dataLength = data.length();
memcpy(p, data.characters(), dataLength * sizeof(UChar));
p += dataLength;
}
ASSERT(p == resultData + resultLength);
return result;
}
PassRefPtr<Text> Text::replaceWholeText(const String& newText, ExceptionCode&)
{
// 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
Node* parent = parentNode(); // Protect against mutation handlers moving this node during traversal
ExceptionCode ignored = 0;
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(), ignored);
}
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(), ignored);
}
}
if (newText.isEmpty()) {
if (parent && parentNode() == parent)
parent->removeChild(this, ignored);
return 0;
}
setData(newText, ignored);
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 create(document(), data());
}
bool Text::rendererIsNeeded(RenderStyle *style)
{
if (!CharacterData::rendererIsNeeded(style))
return false;
bool onlyWS = containsOnlyWhitespace();
if (!onlyWS)
return true;
RenderObject *par = parentNode()->renderer();
if (par->isTable() || par->isTableRow() || par->isTableSection() || par->isTableCol() || par->isFrameSet())
return false;
if (style->preserveNewline()) // pre/pre-wrap/pre-line always make renderers.
return true;
RenderObject *prev = previousRenderer();
if (prev && prev->isBR()) // <span><br/> <br/></span>
return false;
if (par->isRenderInline()) {
// <span><div/> <div/></span>
if (prev && !prev->isInline())
return false;
} else {
if (par->isRenderBlock() && !par->childrenInline() && (!prev || !prev->isInline()))
return false;
RenderObject *first = par->firstChild();
while (first && first->isFloatingOrPositioned())
first = first->nextSibling();
RenderObject *next = nextRenderer();
if (!first || next == 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;
}
RenderObject* Text::createRenderer(RenderArena* arena, RenderStyle*)
{
#if ENABLE(SVG)
if (parentNode()->isSVGElement()
#if ENABLE(SVG_FOREIGN_OBJECT)
&& !parentNode()->hasTagName(SVGNames::foreignObjectTag)
#endif
)
return new (arena) RenderSVGInlineText(this, dataImpl());
#endif
return new (arena) RenderText(this, dataImpl());
}
void Text::attach()
{
#if ENABLE(WML)
if (document()->isWMLDocument() && !containsOnlyWhitespace()) {
String text = data();
ASSERT(!text.isEmpty());
text = substituteVariableReferences(text, document());
ExceptionCode code = 0;
setData(text, code);
ASSERT(!code);
}
#endif
createRendererIfNeeded();
CharacterData::attach();
}
void Text::recalcStyle(StyleChange change)
{
if (change != NoChange && parentNode()) {
if (renderer())
renderer()->setStyle(parentNode()->renderer()->style());
}
if (needsStyleRecalc()) {
if (renderer()) {
if (renderer()->isText())
toRenderText(renderer())->setText(dataImpl());
} else {
if (attached())
detach();
attach();
}
}
setNeedsStyleRecalc(NoStyleChange);
}
bool Text::childTypeAllowed(NodeType)
{
return false;
}
PassRefPtr<Text> Text::virtualCreate(const String& data)
{
return create(document(), data);
}
PassRefPtr<Text> Text::createWithLengthLimit(Document* document, const String& data, unsigned& charsLeft, unsigned maxChars)
{
unsigned dataLength = data.length();
if (charsLeft == dataLength && charsLeft <= maxChars) {
charsLeft = 0;
return create(document, data);
}
unsigned start = dataLength - charsLeft;
unsigned end = start + min(charsLeft, maxChars);
// Check 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 (end < dataLength) {
TextBreakIterator* it = characterBreakIterator(data.characters() + start, (end + 2 > dataLength) ? dataLength - start : end - start + 2);
if (!isTextBreak(it, end - start))
end = textBreakPreceding(it, end - start) + start;
}
// If we have maxChars of unbreakable characters the above could lead to
// an infinite loop.
// FIXME: It would be better to just have the old value of end before calling
// textBreakPreceding rather than this, because this exceeds the length limit.
if (end <= start)
end = dataLength;
charsLeft = dataLength - end;
return create(document, data.substring(start, end - start));
}
#ifndef NDEBUG
void Text::formatForDebugger(char *buffer, unsigned length) const
{
String result;
String s;
s = nodeName();
if (s.length() > 0) {
result += s;
}
s = data();
if (s.length() > 0) {
if (result.length() > 0)
result += "; ";
result += "value=";
result += s;
}
strncpy(buffer, result.utf8().data(), length - 1);
}
#endif
} // namespace WebCore