TextBreakIteratorQt.cpp [plain text]
#include "config.h"
#include "TextBreakIterator.h"
#include <QtCore/qtextboundaryfinder.h>
#include <algorithm>
#include <qdebug.h>
#ifdef DEBUG_TEXT_ITERATORS
#define DEBUG qDebug
#else
#define DEBUG if (1) {} else qDebug
#endif
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);
}
TextBreakIterator* characterBreakIterator(const UChar* string, int length)
{
static TextBreakIterator staticCharacterBreakIterator;
return setUpIterator(staticCharacterBreakIterator, QTextBoundaryFinder::Grapheme, string, length);
}
TextBreakIterator* cursorMovementIterator(const UChar* string, int length)
{
return characterBreakIterator(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;
}
}