TextBreakIteratorQt.cpp [plain text]
#include "config.h"
#include "TextBreakIterator.h"
#if QT_VERSION >= 0x040400
#include <QtCore/qtextboundaryfinder.h>
#include <qdebug.h>
#ifdef DEBUG_TEXT_ITERATORS
#define DEBUG qDebug
#else
#define DEBUG if (1) {} else qDebug
#endif
namespace WebCore {
class TextBreakIterator : public QTextBoundaryFinder
{
};
static QTextBoundaryFinder* iterator = 0;
static unsigned char buffer[1024];
TextBreakIterator* wordBreakIterator(const UChar* string, int length)
{
if (!string)
return 0;
if (!iterator)
iterator = new QTextBoundaryFinder;
*iterator = QTextBoundaryFinder(QTextBoundaryFinder::Word, (const QChar *)string, length, buffer, sizeof(buffer));
return static_cast<TextBreakIterator*>(iterator);
}
TextBreakIterator* characterBreakIterator(const UChar* string, int length)
{
if (!string)
return 0;
if (!iterator)
iterator = new QTextBoundaryFinder;
*iterator = QTextBoundaryFinder(QTextBoundaryFinder::Grapheme, (const QChar *)string, length, buffer, sizeof(buffer));
return static_cast<TextBreakIterator*>(iterator);
}
TextBreakIterator* cursorMovementIterator(const UChar* string, int length)
{
return characterBreakIterator(string, length);
}
TextBreakIterator* lineBreakIterator(const UChar* string, int length)
{
static QTextBoundaryFinder *iterator = 0;
if (!string)
return 0;
if (!iterator)
iterator = new QTextBoundaryFinder;
*iterator = QTextBoundaryFinder(QTextBoundaryFinder::Line, (const QChar *)string, length, buffer, sizeof(buffer));
return static_cast<TextBreakIterator*>(iterator);
}
TextBreakIterator* sentenceBreakIterator(const UChar* string, int length)
{
if (!string)
return 0;
if (!iterator)
iterator = new QTextBoundaryFinder;
*iterator = QTextBoundaryFinder(QTextBoundaryFinder::Sentence, (const QChar *)string, length, buffer, sizeof(buffer));
return static_cast<TextBreakIterator*>(iterator);
}
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;
}
}
#else
#include <qtextlayout.h>
namespace WebCore {
class TextBreakIterator
{
public:
virtual int first() = 0;
virtual int next() = 0;
virtual int previous() = 0;
inline int following(int pos) {
currentPos = pos;
return next();
}
inline int preceding(int pos) {
currentPos = pos;
return previous();
}
int currentPos;
const UChar *string;
int length;
};
class WordBreakIteratorQt : public TextBreakIterator
{
public:
virtual int first();
virtual int next();
virtual int previous();
};
class CharBreakIteratorQt : public TextBreakIterator
{
public:
virtual int first();
virtual int next();
virtual int previous();
QTextLayout layout;
};
int WordBreakIteratorQt::first() {
currentPos = 0;
return currentPos;
}
int WordBreakIteratorQt::next() {
if (currentPos >= length) {
currentPos = -1;
return currentPos;
}
bool haveSpace = false;
while (currentPos < length) {
if (haveSpace && !QChar(string[currentPos]).isSpace())
break;
if (QChar(string[currentPos]).isSpace())
haveSpace = true;
++currentPos;
}
return currentPos;
}
int WordBreakIteratorQt::previous() {
if (currentPos <= 0) {
currentPos = -1;
return currentPos;
}
bool haveSpace = false;
while (currentPos > 0) {
if (haveSpace && !QChar(string[currentPos]).isSpace())
break;
if (QChar(string[currentPos]).isSpace())
haveSpace = true;
--currentPos;
}
return currentPos;
}
int CharBreakIteratorQt::first() {
currentPos = 0;
return currentPos;
}
int CharBreakIteratorQt::next() {
if (currentPos >= length)
return -1;
currentPos = layout.nextCursorPosition(currentPos);
return currentPos;
}
int CharBreakIteratorQt::previous() {
if (currentPos <= 0)
return -1;
currentPos = layout.previousCursorPosition(currentPos);
return currentPos;
}
TextBreakIterator* wordBreakIterator(const UChar* string, int length)
{
static WordBreakIteratorQt *iterator = 0;
if (!iterator)
iterator = new WordBreakIteratorQt;
iterator->string = string;
iterator->length = length;
iterator->currentPos = 0;
return iterator;
}
TextBreakIterator* characterBreakIterator(const UChar* string, int length)
{
static CharBreakIteratorQt *iterator = 0;
if (!iterator)
iterator = new CharBreakIteratorQt;
iterator->string = string;
iterator->length = length;
iterator->currentPos = 0;
iterator->layout.setText(QString(reinterpret_cast<const QChar*>(string), length));
return iterator;
}
TextBreakIterator* cursorMovementIterator(const UChar* string, int length)
{
return characterBreakIterator(string, length);
}
TextBreakIterator* lineBreakIterator(const UChar*, int)
{
return 0;
}
TextBreakIterator* sentenceBreakIterator(const UChar*, int)
{
return 0;
}
int textBreakFirst(TextBreakIterator* bi)
{
return bi->first();
}
int textBreakNext(TextBreakIterator* bi)
{
return bi->next();
}
int textBreakPreceding(TextBreakIterator* bi, int pos)
{
return bi->preceding(pos);
}
int textBreakFollowing(TextBreakIterator* bi, int pos)
{
return bi->following(pos);
}
int textBreakCurrent(TextBreakIterator* bi)
{
return bi->currentPos;
}
bool isTextBreak(TextBreakIterator*, int)
{
return true;
}
}
#endif