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/*
* Copyright (C) 2006 Lars Knoll <lars@trolltech.com>
*
* 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 "TextBreakIterator.h"
#include <QtCore/qtextboundaryfinder.h>
#include <algorithm>
#include <qdebug.h>
#include <wtf/Atomics.h>
#include <wtf/ThreadingPrimitives.h>
// #define DEBUG_TEXT_ITERATORS
#ifdef DEBUG_TEXT_ITERATORS
#define DEBUG qDebug
#else
#define DEBUG if (1) {} else qDebug
#endif
using namespace WTF;
using namespace std;
namespace WebCore {
class TextBreakIterator : public QTextBoundaryFinder {
public:
TextBreakIterator(QTextBoundaryFinder::BoundaryType type, const QString& string)
: QTextBoundaryFinder(type, string)
{ }
TextBreakIterator()
: QTextBoundaryFinder()
{ }
};
TextBreakIterator* setUpIterator(TextBreakIterator& iterator, QTextBoundaryFinder::BoundaryType type, const UChar* characters, int length)
{
if (!characters || !length)
return 0;
if (iterator.isValid() && type == iterator.type() && iterator.string() == QString::fromRawData(reinterpret_cast<const QChar*>(characters), length)) {
iterator.toStart();
return &iterator;
}
iterator = TextBreakIterator(type, QString(reinterpret_cast<const QChar*>(characters), length));
return &iterator;
}
TextBreakIterator* wordBreakIterator(const UChar* string, int length)
{
static TextBreakIterator staticWordBreakIterator;
return setUpIterator(staticWordBreakIterator, QTextBoundaryFinder::Word, string, length);
}
static TextBreakIterator* nonSharedCharacterBreakIterator;
static inline bool compareAndSwapNonSharedCharacterBreakIterator(TextBreakIterator* expected, TextBreakIterator* newValue)
{
#if ENABLE(COMPARE_AND_SWAP)
return weakCompareAndSwap(reinterpret_cast<void**>(&nonSharedCharacterBreakIterator), expected, newValue);
#else
DEFINE_STATIC_LOCAL(Mutex, nonSharedCharacterBreakIteratorMutex, ());
MutexLocker locker(nonSharedCharacterBreakIteratorMutex);
if (nonSharedCharacterBreakIterator != expected)
return false;
nonSharedCharacterBreakIterator = newValue;
return true;
#endif
}
NonSharedCharacterBreakIterator::NonSharedCharacterBreakIterator(const UChar* buffer, int length)
{
m_iterator = nonSharedCharacterBreakIterator;
bool createdIterator = m_iterator && compareAndSwapNonSharedCharacterBreakIterator(m_iterator, 0);
if (!createdIterator)
m_iterator = new TextBreakIterator();
if (!setUpIterator(*m_iterator, QTextBoundaryFinder::Grapheme, buffer, length)) {
delete m_iterator;
m_iterator = 0;
}
}
NonSharedCharacterBreakIterator::~NonSharedCharacterBreakIterator()
{
if (!compareAndSwapNonSharedCharacterBreakIterator(m_iterator, 0))
delete m_iterator;
}
TextBreakIterator* cursorMovementIterator(const UChar* string, int length)
{
static TextBreakIterator staticCursorMovementIterator;
return setUpIterator(staticCursorMovementIterator, QTextBoundaryFinder::Grapheme, string, length);
}
static TextBreakIterator* staticLineBreakIterator;
TextBreakIterator* acquireLineBreakIterator(const UChar* string, int length, const AtomicString&)
{
TextBreakIterator* lineBreakIterator = 0;
if (staticLineBreakIterator) {
setUpIterator(*staticLineBreakIterator, QTextBoundaryFinder::Line, string, length);
std::swap(staticLineBreakIterator, lineBreakIterator);
}
if (!lineBreakIterator && string && length)
lineBreakIterator = new TextBreakIterator(QTextBoundaryFinder::Line, QString(reinterpret_cast<const QChar*>(string), length));
return lineBreakIterator;
}
void releaseLineBreakIterator(TextBreakIterator* iterator)
{
ASSERT(iterator);
if (!staticLineBreakIterator)
staticLineBreakIterator = iterator;
else
delete iterator;
}
TextBreakIterator* sentenceBreakIterator(const UChar* string, int length)
{
static TextBreakIterator staticSentenceBreakIterator;
return setUpIterator(staticSentenceBreakIterator, QTextBoundaryFinder::Sentence, string, length);
}
int textBreakFirst(TextBreakIterator* bi)
{
bi->toStart();
DEBUG() << "textBreakFirst" << bi->position();
return bi->position();
}
int textBreakNext(TextBreakIterator* bi)
{
int pos = bi->toNextBoundary();
DEBUG() << "textBreakNext" << pos;
return pos;
}
int textBreakPreceding(TextBreakIterator* bi, int pos)
{
bi->setPosition(pos);
int newpos = bi->toPreviousBoundary();
DEBUG() << "textBreakPreceding" << pos << newpos;
return newpos;
}
int textBreakFollowing(TextBreakIterator* bi, int pos)
{
bi->setPosition(pos);
int newpos = bi->toNextBoundary();
DEBUG() << "textBreakFollowing" << pos << newpos;
return newpos;
}
int textBreakCurrent(TextBreakIterator* bi)
{
return bi->position();
}
bool isTextBreak(TextBreakIterator*, int)
{
return true;
}
bool isWordTextBreak(TextBreakIterator*)
{
return true;
}
}
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