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qt6-bb10/src/corelib/serialization/qtextstream.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
//#define QTEXTSTREAM_DEBUG
static const int QTEXTSTREAM_BUFFERSIZE = 16384;
/*!
\class QTextStream
\inmodule QtCore
\brief The QTextStream class provides a convenient interface for
reading and writing text.
\ingroup io
\ingroup string-processing
\ingroup qtserialization
\reentrant
QTextStream can operate on a QIODevice, a QByteArray or a
QString. Using QTextStream's streaming operators, you can
conveniently read and write words, lines and numbers. For
generating text, QTextStream supports formatting options for field
padding and alignment, and formatting of numbers. Example:
\snippet code/src_corelib_io_qtextstream.cpp 0
It's also common to use QTextStream to read console input and write
console output. QTextStream is locale aware, and will automatically decode
standard input using the correct encoding. Example:
\snippet code/src_corelib_io_qtextstream.cpp 1
Besides using QTextStream's constructors, you can also set the
device or string QTextStream operates on by calling setDevice() or
setString(). You can seek to a position by calling seek(), and
atEnd() will return true when there is no data left to be read. If
you call flush(), QTextStream will empty all data from its write
buffer into the device and call flush() on the device.
Internally, QTextStream uses a Unicode based buffer, and
QStringConverter is used by QTextStream to automatically support
different encodings. By default, UTF-8
is used for reading and writing, but you can also set the encoding by
calling setEncoding(). Automatic Unicode detection is also
supported. When this feature is enabled (the default behavior),
QTextStream will detect the UTF-8, UTF-16 or the UTF-32 BOM (Byte Order Mark) and
switch to the appropriate UTF encoding when reading. QTextStream
does not write a BOM by default, but you can enable this by calling
setGenerateByteOrderMark(true). When QTextStream operates on a QString
directly, the encoding is disabled.
There are three general ways to use QTextStream when reading text
files:
\list
\li Chunk by chunk, by calling readLine() or readAll().
\li Word by word. QTextStream supports streaming into \l {QString}s,
\l {QByteArray}s and char* buffers. Words are delimited by space, and
leading white space is automatically skipped.
\li Character by character, by streaming into QChar or char types.
This method is often used for convenient input handling when
parsing files, independent of character encoding and end-of-line
semantics. To skip white space, call skipWhiteSpace().
\endlist
Since the text stream uses a buffer, you should not read from
the stream using the implementation of a superclass. For instance,
if you have a QFile and read from it directly using
QFile::readLine() instead of using the stream, the text stream's
internal position will be out of sync with the file's position.
By default, when reading numbers from a stream of text,
QTextStream will automatically detect the number's base
representation. For example, if the number starts with "0x", it is
assumed to be in hexadecimal form. If it starts with the digits
1-9, it is assumed to be in decimal form, and so on. You can set
the integer base, thereby disabling the automatic detection, by
calling setIntegerBase(). Example:
\snippet code/src_corelib_io_qtextstream.cpp 2
QTextStream supports many formatting options for generating text.
You can set the field width and pad character by calling
setFieldWidth() and setPadChar(). Use setFieldAlignment() to set
the alignment within each field. For real numbers, call
setRealNumberNotation() and setRealNumberPrecision() to set the
notation (SmartNotation, ScientificNotation, FixedNotation) and precision in
digits of the generated number. Some extra number formatting
options are also available through setNumberFlags().
\target QTextStream manipulators
Like \c <iostream> in the standard C++ library, QTextStream also
defines several global manipulator functions:
\table
\header \li Manipulator \li Description
\row \li Qt::bin \li Same as setIntegerBase(2).
\row \li Qt::oct \li Same as setIntegerBase(8).
\row \li Qt::dec \li Same as setIntegerBase(10).
\row \li Qt::hex \li Same as setIntegerBase(16).
\row \li Qt::showbase \li Same as setNumberFlags(numberFlags() | ShowBase).
\row \li Qt::forcesign \li Same as setNumberFlags(numberFlags() | ForceSign).
\row \li Qt::forcepoint \li Same as setNumberFlags(numberFlags() | ForcePoint).
\row \li Qt::noshowbase \li Same as setNumberFlags(numberFlags() & ~ShowBase).
\row \li Qt::noforcesign \li Same as setNumberFlags(numberFlags() & ~ForceSign).
\row \li Qt::noforcepoint \li Same as setNumberFlags(numberFlags() & ~ForcePoint).
\row \li Qt::uppercasebase \li Same as setNumberFlags(numberFlags() | UppercaseBase).
\row \li Qt::uppercasedigits \li Same as setNumberFlags(numberFlags() | UppercaseDigits).
\row \li Qt::lowercasebase \li Same as setNumberFlags(numberFlags() & ~UppercaseBase).
\row \li Qt::lowercasedigits \li Same as setNumberFlags(numberFlags() & ~UppercaseDigits).
\row \li Qt::fixed \li Same as setRealNumberNotation(FixedNotation).
\row \li Qt::scientific \li Same as setRealNumberNotation(ScientificNotation).
\row \li Qt::left \li Same as setFieldAlignment(AlignLeft).
\row \li Qt::right \li Same as setFieldAlignment(AlignRight).
\row \li Qt::center \li Same as setFieldAlignment(AlignCenter).
\row \li Qt::endl \li Same as operator<<('\\n') and flush().
\row \li Qt::flush \li Same as flush().
\row \li Qt::reset \li Same as reset().
\row \li Qt::ws \li Same as skipWhiteSpace().
\row \li Qt::bom \li Same as setGenerateByteOrderMark(true).
\endtable
In addition, Qt provides three global manipulators that take a
parameter: qSetFieldWidth(), qSetPadChar(), and
qSetRealNumberPrecision().
\sa QDataStream, QIODevice, QFile, QBuffer, QTcpSocket
*/
/*! \enum QTextStream::RealNumberNotation
This enum specifies which notations to use for expressing \c
float and \c double as strings.
\value ScientificNotation Scientific notation (\c{printf()}'s \c %e flag).
\value FixedNotation Fixed-point notation (\c{printf()}'s \c %f flag).
\value SmartNotation Scientific or fixed-point notation, depending on which makes most sense (\c{printf()}'s \c %g flag).
\sa setRealNumberNotation()
*/
/*! \enum QTextStream::FieldAlignment
This enum specifies how to align text in fields when the field is
wider than the text that occupies it.
\value AlignLeft Pad on the right side of fields.
\value AlignRight Pad on the left side of fields.
\value AlignCenter Pad on both sides of field.
\value AlignAccountingStyle Same as AlignRight, except that the
sign of a number is flush left.
\sa setFieldAlignment()
*/
/*! \enum QTextStream::NumberFlag
This enum specifies various flags that can be set to affect the
output of integers, \c{float}s, and \c{double}s.
\value ShowBase Show the base as a prefix if the base
is 16 ("0x"), 8 ("0"), or 2 ("0b").
\value ForcePoint Always put the decimal separator in numbers, even if
there are no decimals.
\value ForceSign Always put the sign in numbers, even for positive numbers.
\value UppercaseBase Use uppercase versions of base prefixes ("0X", "0B").
\value UppercaseDigits Use uppercase letters for expressing
digits 10 to 35 instead of lowercase.
\sa setNumberFlags()
*/
/*! \enum QTextStream::Status
This enum describes the current status of the text stream.
\value Ok The text stream is operating normally.
\value ReadPastEnd The text stream has read past the end of the
data in the underlying device.
\value ReadCorruptData The text stream has read corrupt data.
\value WriteFailed The text stream cannot write to the underlying device.
\sa status()
*/
#include "qtextstream.h"
#include "private/qtextstream_p.h"
#include "qbuffer.h"
#include "qfile.h"
#include "qnumeric.h"
#include "qvarlengtharray.h"
#include <private/qdebug_p.h>
#include <private/qtools_p.h>
#include <locale.h>
#include "private/qlocale_p.h"
#include "private/qstringconverter_p.h"
#include <stdlib.h>
#include <limits.h>
#include <new>
// A precondition macro
#define Q_VOID
#define CHECK_VALID_STREAM(x) do { \
if (!d->string && !d->device) { \
qWarning("QTextStream: No device"); \
return x; \
} } while (0)
// Base implementations of operator>> for ints and reals
#define IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(type) do { \
Q_D(QTextStream); \
CHECK_VALID_STREAM(*this); \
qulonglong tmp; \
switch (d->getNumber(&tmp)) { \
case QTextStreamPrivate::npsOk: \
i = (type)tmp; \
break; \
case QTextStreamPrivate::npsMissingDigit: \
case QTextStreamPrivate::npsInvalidPrefix: \
i = (type)0; \
setStatus(atEnd() ? QTextStream::ReadPastEnd : QTextStream::ReadCorruptData); \
break; \
} \
return *this; } while (0)
#define IMPLEMENT_STREAM_RIGHT_REAL_OPERATOR(type) do { \
Q_D(QTextStream); \
CHECK_VALID_STREAM(*this); \
double tmp; \
if (d->getReal(&tmp)) { \
f = (type)tmp; \
} else { \
f = (type)0; \
setStatus(atEnd() ? QTextStream::ReadPastEnd : QTextStream::ReadCorruptData); \
} \
return *this; } while (0)
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
using namespace QtMiscUtils;
//-------------------------------------------------------------------
/*!
\internal
*/
QTextStreamPrivate::QTextStreamPrivate(QTextStream *q_ptr)
: readConverterSavedStateOffset(0),
locale(QLocale::c())
{
this->q_ptr = q_ptr;
reset();
}
/*!
\internal
*/
QTextStreamPrivate::~QTextStreamPrivate()
{
if (deleteDevice) {
#ifndef QT_NO_QOBJECT
device->blockSignals(true);
#endif
delete device;
}
}
void QTextStreamPrivate::Params::reset()
{
realNumberPrecision = 6;
integerBase = 0;
fieldWidth = 0;
padChar = u' ';
fieldAlignment = QTextStream::AlignRight;
realNumberNotation = QTextStream::SmartNotation;
numberFlags = { };
}
/*!
\internal
*/
void QTextStreamPrivate::reset()
{
params.reset();
device = nullptr;
deleteDevice = false;
string = nullptr;
stringOffset = 0;
stringOpenMode = QTextStream::NotOpen;
readBufferOffset = 0;
readBufferStartDevicePos = 0;
lastTokenSize = 0;
hasWrittenData = false;
generateBOM = false;
encoding = QStringConverter::Utf8;
toUtf16 = QStringDecoder(encoding);
fromUtf16 = QStringEncoder(encoding);
autoDetectUnicode = true;
}
/*!
\internal
*/
bool QTextStreamPrivate::fillReadBuffer(qint64 maxBytes)
{
// no buffer next to the QString itself; this function should only
// be called internally, for devices.
Q_ASSERT(!string);
Q_ASSERT(device);
// handle text translation and bypass the Text flag in the device.
bool textModeEnabled = device->isTextModeEnabled();
if (textModeEnabled)
device->setTextModeEnabled(false);
// read raw data into a temporary buffer
char buf[QTEXTSTREAM_BUFFERSIZE];
qint64 bytesRead = 0;
#if defined(Q_OS_WIN)
// On Windows, there is no non-blocking stdin - so we fall back to reading
// lines instead. If there is no QOBJECT, we read lines for all sequential
// devices; otherwise, we read lines only for stdin.
QFile *file = 0;
Q_UNUSED(file);
if (device->isSequential()
#if !defined(QT_NO_QOBJECT)
&& (file = qobject_cast<QFile *>(device)) && file->handle() == 0
#endif
) {
if (maxBytes != -1)
bytesRead = device->readLine(buf, qMin<qint64>(sizeof(buf), maxBytes));
else
bytesRead = device->readLine(buf, sizeof(buf));
} else
#endif
{
if (maxBytes != -1)
bytesRead = device->read(buf, qMin<qint64>(sizeof(buf), maxBytes));
else
bytesRead = device->read(buf, sizeof(buf));
}
// reset the Text flag.
if (textModeEnabled)
device->setTextModeEnabled(true);
if (bytesRead <= 0)
return false;
if (autoDetectUnicode) {
autoDetectUnicode = false;
auto e = QStringConverter::encodingForData(QByteArrayView(buf, bytesRead));
// QStringConverter::Locale implies unknown, so keep the current encoding
if (e) {
encoding = *e;
toUtf16 = QStringDecoder(encoding);
fromUtf16 = QStringEncoder(encoding);
}
}
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::fillReadBuffer(), using %s encoding", QStringConverter::nameForEncoding(encoding));
#endif
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::fillReadBuffer(), device->read(\"%s\", %d) == %d",
QtDebugUtils::toPrintable(buf, bytesRead, 32).constData(), int(sizeof(buf)), int(bytesRead));
#endif
int oldReadBufferSize = readBuffer.size();
readBuffer += toUtf16(QByteArrayView(buf, bytesRead));
// remove all '\r\n' in the string.
if (readBuffer.size() > oldReadBufferSize && textModeEnabled) {
QChar CR = u'\r';
QChar *writePtr = readBuffer.data() + oldReadBufferSize;
QChar *readPtr = readBuffer.data() + oldReadBufferSize;
QChar *endPtr = readBuffer.data() + readBuffer.size();
int n = oldReadBufferSize;
if (readPtr < endPtr) {
// Cut-off to avoid unnecessary self-copying.
while (*readPtr++ != CR) {
++n;
if (++writePtr == endPtr)
break;
}
}
while (readPtr < endPtr) {
QChar ch = *readPtr++;
if (ch != CR) {
*writePtr++ = ch;
} else {
if (n < readBufferOffset)
--readBufferOffset;
--bytesRead;
}
++n;
}
readBuffer.resize(writePtr - readBuffer.data());
}
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::fillReadBuffer() read %d bytes from device. readBuffer = [%s]", int(bytesRead),
QtDebugUtils::toPrintable(readBuffer.toLatin1(), readBuffer.size(), readBuffer.size()).constData());
#endif
return true;
}
/*!
\internal
*/
void QTextStreamPrivate::resetReadBuffer()
{
readBuffer.clear();
readBufferOffset = 0;
readBufferStartDevicePos = (device ? device->pos() : 0);
}
/*!
\internal
*/
void QTextStreamPrivate::flushWriteBuffer()
{
// no buffer next to the QString itself; this function should only
// be called internally, for devices.
if (string || !device)
return;
// Stream went bye-bye already. Appending further data may succeed again,
// but would create a corrupted stream anyway.
if (status != QTextStream::Ok)
return;
if (writeBuffer.isEmpty())
return;
#if defined (Q_OS_WIN)
// handle text translation and bypass the Text flag in the device.
bool textModeEnabled = device->isTextModeEnabled();
if (textModeEnabled) {
device->setTextModeEnabled(false);
writeBuffer.replace(u'\n', "\r\n"_L1);
}
#endif
QByteArray data = fromUtf16(writeBuffer);
writeBuffer.clear();
hasWrittenData = true;
// write raw data to the device
qint64 bytesWritten = device->write(data);
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::flushWriteBuffer(), device->write(\"%s\") == %d",
QtDebugUtils::toPrintable(data.constData(), data.size(), 32).constData(), int(bytesWritten));
#endif
#if defined (Q_OS_WIN)
// reset the text flag
if (textModeEnabled)
device->setTextModeEnabled(true);
#endif
if (bytesWritten <= 0) {
status = QTextStream::WriteFailed;
return;
}
// flush the file
#ifndef QT_NO_QOBJECT
QFileDevice *file = qobject_cast<QFileDevice *>(device);
bool flushed = !file || file->flush();
#else
bool flushed = true;
#endif
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::flushWriteBuffer() wrote %d bytes",
int(bytesWritten));
#endif
if (!flushed || bytesWritten != qint64(data.size()))
status = QTextStream::WriteFailed;
}
QString QTextStreamPrivate::read(int maxlen)
{
QString ret;
if (string) {
lastTokenSize = qMin(maxlen, string->size() - stringOffset);
ret = string->mid(stringOffset, lastTokenSize);
} else {
while (readBuffer.size() - readBufferOffset < maxlen && fillReadBuffer()) ;
lastTokenSize = qMin(maxlen, readBuffer.size() - readBufferOffset);
ret = readBuffer.mid(readBufferOffset, lastTokenSize);
}
consumeLastToken();
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::read() maxlen = %d, token length = %d", maxlen, ret.length());
#endif
return ret;
}
/*!
\internal
Scans no more than \a maxlen QChars in the current buffer for the
first \a delimiter. Stores a pointer to the start offset of the
token in \a ptr, and the length in QChars in \a length.
*/
bool QTextStreamPrivate::scan(const QChar **ptr, int *length, int maxlen, TokenDelimiter delimiter)
{
int totalSize = 0;
int delimSize = 0;
bool consumeDelimiter = false;
bool foundToken = false;
int startOffset = device ? readBufferOffset : stringOffset;
QChar lastChar;
do {
int endOffset;
const QChar *chPtr;
if (device) {
chPtr = readBuffer.constData();
endOffset = readBuffer.size();
} else {
chPtr = string->constData();
endOffset = string->size();
}
chPtr += startOffset;
for (; !foundToken && startOffset < endOffset && (!maxlen || totalSize < maxlen); ++startOffset) {
const QChar ch = *chPtr++;
++totalSize;
switch (delimiter) {
case Space:
if (ch.isSpace()) {
foundToken = true;
delimSize = 1;
}
break;
case NotSpace:
if (!ch.isSpace()) {
foundToken = true;
delimSize = 1;
}
break;
case EndOfLine:
if (ch == u'\n') {
foundToken = true;
delimSize = (lastChar == u'\r') ? 2 : 1;
consumeDelimiter = true;
}
lastChar = ch;
break;
}
}
} while (!foundToken
&& (!maxlen || totalSize < maxlen)
&& device && fillReadBuffer());
if (totalSize == 0) {
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::scan() reached the end of input.");
#endif
return false;
}
// if we find a '\r' at the end of the data when reading lines,
// don't make it part of the line.
if (delimiter == EndOfLine && totalSize > 0 && !foundToken) {
if (((string && stringOffset + totalSize == string->size()) || (device && device->atEnd()))
&& lastChar == u'\r') {
consumeDelimiter = true;
++delimSize;
}
}
// set the read offset and length of the token
if (length)
*length = totalSize - delimSize;
if (ptr)
*ptr = readPtr();
// update last token size. the callee will call consumeLastToken() when
// done.
lastTokenSize = totalSize;
if (!consumeDelimiter)
lastTokenSize -= delimSize;
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::scan(%p, %p, %d, %x) token length = %d, delimiter = %d",
ptr, length, maxlen, (int)delimiter, totalSize - delimSize, delimSize);
#endif
return true;
}
/*!
\internal
*/
inline const QChar *QTextStreamPrivate::readPtr() const
{
Q_ASSERT(readBufferOffset <= readBuffer.size());
if (string)
return string->constData() + stringOffset;
return readBuffer.constData() + readBufferOffset;
}
/*!
\internal
*/
inline void QTextStreamPrivate::consumeLastToken()
{
if (lastTokenSize)
consume(lastTokenSize);
lastTokenSize = 0;
}
/*!
\internal
*/
inline void QTextStreamPrivate::consume(int size)
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStreamPrivate::consume(%d)", size);
#endif
if (string) {
stringOffset += size;
if (stringOffset > string->size())
stringOffset = string->size();
} else {
readBufferOffset += size;
if (readBufferOffset >= readBuffer.size()) {
readBufferOffset = 0;
readBuffer.clear();
saveConverterState(device->pos());
} else if (readBufferOffset > QTEXTSTREAM_BUFFERSIZE) {
readBuffer = readBuffer.remove(0,readBufferOffset);
readConverterSavedStateOffset += readBufferOffset;
readBufferOffset = 0;
}
}
}
/*!
\internal
*/
inline void QTextStreamPrivate::saveConverterState(qint64 newPos)
{
// ### Hack, FIXME
memcpy((void *)&savedToUtf16, (void *)&toUtf16, sizeof(QStringDecoder));
readBufferStartDevicePos = newPos;
readConverterSavedStateOffset = 0;
}
/*!
\internal
*/
inline void QTextStreamPrivate::restoreToSavedConverterState()
{
if (savedToUtf16.isValid())
memcpy((void *)&toUtf16, (void *)&savedToUtf16, sizeof(QStringDecoder));
else
toUtf16.resetState();
savedToUtf16 = QStringDecoder();
}
/*!
\internal
*/
void QTextStreamPrivate::write(const QChar *data, qsizetype len)
{
if (string) {
// ### What about seek()??
string->append(data, len);
} else {
writeBuffer.append(data, len);
if (writeBuffer.size() > QTEXTSTREAM_BUFFERSIZE)
flushWriteBuffer();
}
}
/*!
\internal
*/
inline void QTextStreamPrivate::write(QChar ch)
{
if (string) {
// ### What about seek()??
string->append(ch);
} else {
writeBuffer += ch;
if (writeBuffer.size() > QTEXTSTREAM_BUFFERSIZE)
flushWriteBuffer();
}
}
/*!
\internal
*/
void QTextStreamPrivate::write(QLatin1StringView data)
{
if (string) {
// ### What about seek()??
string->append(data);
} else {
writeBuffer += data;
if (writeBuffer.size() > QTEXTSTREAM_BUFFERSIZE)
flushWriteBuffer();
}
}
/*!
\internal
*/
void QTextStreamPrivate::writePadding(qsizetype len)
{
if (string) {
// ### What about seek()??
string->resize(string->size() + len, params.padChar);
} else {
writeBuffer.resize(writeBuffer.size() + len, params.padChar);
if (writeBuffer.size() > QTEXTSTREAM_BUFFERSIZE)
flushWriteBuffer();
}
}
/*!
\internal
*/
inline bool QTextStreamPrivate::getChar(QChar *ch)
{
if ((string && stringOffset == string->size())
|| (device && readBuffer.isEmpty() && !fillReadBuffer())) {
if (ch)
*ch = QChar();
return false;
}
if (ch)
*ch = *readPtr();
consume(1);
return true;
}
/*!
\internal
*/
inline void QTextStreamPrivate::ungetChar(QChar ch)
{
if (string) {
if (stringOffset == 0)
string->prepend(ch);
else
(*string)[--stringOffset] = ch;
return;
}
if (readBufferOffset == 0) {
readBuffer.prepend(ch);
return;
}
readBuffer[--readBufferOffset] = ch;
}
/*!
\internal
*/
inline void QTextStreamPrivate::putChar(QChar ch)
{
if (params.fieldWidth > 0)
putString(&ch, 1);
else
write(ch);
}
/*!
\internal
*/
QTextStreamPrivate::PaddingResult QTextStreamPrivate::padding(qsizetype len) const
{
Q_ASSERT(params.fieldWidth > len); // calling padding() when no padding is needed is an error
int left = 0, right = 0;
const int padSize = params.fieldWidth - len;
switch (params.fieldAlignment) {
case QTextStream::AlignLeft:
right = padSize;
break;
case QTextStream::AlignRight:
case QTextStream::AlignAccountingStyle:
left = padSize;
break;
case QTextStream::AlignCenter:
left = padSize/2;
right = padSize - padSize/2;
break;
}
return { left, right };
}
/*!
\internal
*/
void QTextStreamPrivate::putString(const QChar *data, qsizetype len, bool number)
{
if (Q_UNLIKELY(params.fieldWidth > len)) {
// handle padding:
const PaddingResult pad = padding(len);
if (params.fieldAlignment == QTextStream::AlignAccountingStyle && number) {
const QChar sign = len > 0 ? data[0] : QChar();
if (sign == locale.negativeSign() || sign == locale.positiveSign()) {
// write the sign before the padding, then skip it later
write(&sign, 1);
++data;
--len;
}
}
writePadding(pad.left);
write(data, len);
writePadding(pad.right);
} else {
write(data, len);
}
}
/*!
\internal
*/
void QTextStreamPrivate::putString(QLatin1StringView data, bool number)
{
if (Q_UNLIKELY(params.fieldWidth > data.size())) {
// handle padding
const PaddingResult pad = padding(data.size());
if (params.fieldAlignment == QTextStream::AlignAccountingStyle && number) {
const QChar sign = data.size() > 0 ? QLatin1Char(*data.data()) : QChar();
if (sign == locale.negativeSign() || sign == locale.positiveSign()) {
// write the sign before the padding, then skip it later
write(&sign, 1);
data = QLatin1StringView(data.data() + 1, data.size() - 1);
}
}
writePadding(pad.left);
write(data);
writePadding(pad.right);
} else {
write(data);
}
}
void QTextStreamPrivate::putString(QUtf8StringView data, bool number)
{
putString(data.toString(), number);
}
/*!
Constructs a QTextStream. Before you can use it for reading or
writing, you must assign a device or a string.
\sa setDevice(), setString()
*/
QTextStream::QTextStream()
: d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::QTextStream()");
#endif
Q_D(QTextStream);
d->status = Ok;
}
/*!
Constructs a QTextStream that operates on \a device.
*/
QTextStream::QTextStream(QIODevice *device)
: d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::QTextStream(QIODevice *device == *%p)",
device);
#endif
Q_D(QTextStream);
d->device = device;
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
d->status = Ok;
}
/*!
Constructs a QTextStream that operates on \a string, using \a
openMode to define the open mode.
*/
QTextStream::QTextStream(QString *string, OpenMode openMode)
: d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::QTextStream(QString *string == *%p, openMode = %d)",
string, int(openMode));
#endif
Q_D(QTextStream);
d->string = string;
d->stringOpenMode = openMode;
d->status = Ok;
}
/*!
Constructs a QTextStream that operates on \a array, using \a
openMode to define the open mode. Internally, the array is wrapped
by a QBuffer.
*/
QTextStream::QTextStream(QByteArray *array, OpenMode openMode)
: d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::QTextStream(QByteArray *array == *%p, openMode = %d)",
array, int(openMode));
#endif
Q_D(QTextStream);
d->device = new QBuffer(array);
d->device->open(openMode);
d->deleteDevice = true;
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
d->status = Ok;
}
/*!
Constructs a QTextStream that operates on \a array, using \a
openMode to define the open mode. The array is accessed as
read-only, regardless of the values in \a openMode.
This constructor is convenient for working on constant
strings. Example:
\snippet code/src_corelib_io_qtextstream.cpp 3
*/
QTextStream::QTextStream(const QByteArray &array, OpenMode openMode)
: d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::QTextStream(const QByteArray &array == *(%p), openMode = %d)",
&array, int(openMode));
#endif
QBuffer *buffer = new QBuffer;
buffer->setData(array);
buffer->open(openMode);
Q_D(QTextStream);
d->device = buffer;
d->deleteDevice = true;
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
d->status = Ok;
}
/*!
Constructs a QTextStream that operates on \a fileHandle, using \a
openMode to define the open mode. Internally, a QFile is created
to handle the FILE pointer.
This constructor is useful for working directly with the common
FILE based input and output streams: stdin, stdout and stderr. Example:
\snippet code/src_corelib_io_qtextstream.cpp 4
*/
QTextStream::QTextStream(FILE *fileHandle, OpenMode openMode)
: d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::QTextStream(FILE *fileHandle = %p, openMode = %d)",
fileHandle, int(openMode));
#endif
QFile *file = new QFile;
file->open(fileHandle, openMode);
Q_D(QTextStream);
d->device = file;
d->deleteDevice = true;
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
d->status = Ok;
}
/*!
Destroys the QTextStream.
If the stream operates on a device, flush() will be called
implicitly. Otherwise, the device is unaffected.
*/
QTextStream::~QTextStream()
{
Q_D(QTextStream);
#if defined (QTEXTSTREAM_DEBUG)
qDebug("QTextStream::~QTextStream()");
#endif
if (!d->writeBuffer.isEmpty())
d->flushWriteBuffer();
}
/*!
Resets QTextStream's formatting options, bringing it back to its
original constructed state. The device, string and any buffered
data is left untouched.
*/
void QTextStream::reset()
{
Q_D(QTextStream);
d->params.reset();
}
/*!
Flushes any buffered data waiting to be written to the device.
If QTextStream operates on a string, this function does nothing.
*/
void QTextStream::flush()
{
Q_D(QTextStream);
d->flushWriteBuffer();
}
/*!
Seeks to the position \a pos in the device. Returns \c true on
success; otherwise returns \c false.
*/
bool QTextStream::seek(qint64 pos)
{
Q_D(QTextStream);
d->lastTokenSize = 0;
if (d->device) {
// Empty the write buffer
d->flushWriteBuffer();
if (!d->device->seek(pos))
return false;
d->resetReadBuffer();
d->toUtf16.resetState();
d->fromUtf16.resetState();
return true;
}
// string
if (d->string && pos <= d->string->size()) {
d->stringOffset = int(pos);
return true;
}
return false;
}
/*!
\since 4.2
Returns the device position corresponding to the current position of the
stream, or -1 if an error occurs (e.g., if there is no device or string,
or if there's a device error).
Because QTextStream is buffered, this function may have to
seek the device to reconstruct a valid device position. This
operation can be expensive, so you may want to avoid calling this
function in a tight loop.
\sa seek()
*/
qint64 QTextStream::pos() const
{
Q_D(const QTextStream);
if (d->device) {
// Cutoff
if (d->readBuffer.isEmpty())
return d->device->pos();
if (d->device->isSequential())
return 0;
// Seek the device
if (!d->device->seek(d->readBufferStartDevicePos))
return qint64(-1);
// Reset the read buffer
QTextStreamPrivate *thatd = const_cast<QTextStreamPrivate *>(d);
thatd->readBuffer.clear();
thatd->restoreToSavedConverterState();
if (d->readBufferStartDevicePos == 0)
thatd->autoDetectUnicode = true;
// Rewind the device to get to the current position Ensure that
// readBufferOffset is unaffected by fillReadBuffer()
int oldReadBufferOffset = d->readBufferOffset + d->readConverterSavedStateOffset;
while (d->readBuffer.size() < oldReadBufferOffset) {
if (!thatd->fillReadBuffer(1))
return qint64(-1);
}
thatd->readBufferOffset = oldReadBufferOffset;
thatd->readConverterSavedStateOffset = 0;
// Return the device position.
return d->device->pos();
}
if (d->string)
return d->stringOffset;
qWarning("QTextStream::pos: no device");
return qint64(-1);
}
/*!
Reads and discards whitespace from the stream until either a
non-space character is detected, or until atEnd() returns
true. This function is useful when reading a stream character by
character.
Whitespace characters are all characters for which
QChar::isSpace() returns \c true.
\sa operator>>()
*/
void QTextStream::skipWhiteSpace()
{
Q_D(QTextStream);
CHECK_VALID_STREAM(Q_VOID);
d->scan(nullptr, nullptr, 0, QTextStreamPrivate::NotSpace);
d->consumeLastToken();
}
/*!
Sets the current device to \a device. If a device has already been
assigned, QTextStream will call flush() before the old device is
replaced.
\note This function resets locale to the default locale ('C')
and encoding to the default encoding, UTF-8.
\sa device(), setString()
*/
void QTextStream::setDevice(QIODevice *device)
{
Q_D(QTextStream);
flush();
if (d->deleteDevice) {
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.disconnect();
#endif
delete d->device;
d->deleteDevice = false;
}
d->reset();
d->status = Ok;
d->device = device;
d->resetReadBuffer();
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
}
/*!
Returns the current device associated with the QTextStream,
or \nullptr if no device has been assigned.
\sa setDevice(), string()
*/
QIODevice *QTextStream::device() const
{
Q_D(const QTextStream);
return d->device;
}
/*!
Sets the current string to \a string, using the given \a
openMode. If a device has already been assigned, QTextStream will
call flush() before replacing it.
\sa string(), setDevice()
*/
void QTextStream::setString(QString *string, OpenMode openMode)
{
Q_D(QTextStream);
flush();
if (d->deleteDevice) {
#ifndef QT_NO_QOBJECT
d->deviceClosedNotifier.disconnect();
d->device->blockSignals(true);
#endif
delete d->device;
d->deleteDevice = false;
}
d->reset();
d->status = Ok;
d->string = string;
d->stringOpenMode = openMode;
}
/*!
Returns the current string assigned to the QTextStream, or
\nullptr if no string has been assigned.
\sa setString(), device()
*/
QString *QTextStream::string() const
{
Q_D(const QTextStream);
return d->string;
}
/*!
Sets the field alignment to \a mode. When used together with
setFieldWidth(), this function allows you to generate formatted
output with text aligned to the left, to the right or center
aligned.
\sa fieldAlignment(), setFieldWidth()
*/
void QTextStream::setFieldAlignment(FieldAlignment mode)
{
Q_D(QTextStream);
d->params.fieldAlignment = mode;
}
/*!
Returns the current field alignment.
\sa setFieldAlignment(), fieldWidth()
*/
QTextStream::FieldAlignment QTextStream::fieldAlignment() const
{
Q_D(const QTextStream);
return d->params.fieldAlignment;
}
/*!
Sets the pad character to \a ch. The default value is the ASCII
space character (' '), or QChar(0x20). This character is used to
fill in the space in fields when generating text.
Example:
\snippet code/src_corelib_io_qtextstream.cpp 5
The string \c s contains:
\snippet code/src_corelib_io_qtextstream.cpp 6
\sa padChar(), setFieldWidth()
*/
void QTextStream::setPadChar(QChar ch)
{
Q_D(QTextStream);
d->params.padChar = ch;
}
/*!
Returns the current pad character.
\sa setPadChar(), setFieldWidth()
*/
QChar QTextStream::padChar() const
{
Q_D(const QTextStream);
return d->params.padChar;
}
/*!
Sets the current field width to \a width. If \a width is 0 (the
default), the field width is equal to the length of the generated
text.
\note The field width applies to every element appended to this
stream after this function has been called (e.g., it also pads
endl). This behavior is different from similar classes in the STL,
where the field width only applies to the next element.
\sa fieldWidth(), setPadChar()
*/
void QTextStream::setFieldWidth(int width)
{
Q_D(QTextStream);
d->params.fieldWidth = width;
}
/*!
Returns the current field width.
\sa setFieldWidth()
*/
int QTextStream::fieldWidth() const
{
Q_D(const QTextStream);
return d->params.fieldWidth;
}
/*!
Sets the current number flags to \a flags. \a flags is a set of
flags from the NumberFlag enum, and describes options for
formatting generated code (e.g., whether or not to always write
the base or sign of a number).
\sa numberFlags(), setIntegerBase(), setRealNumberNotation()
*/
void QTextStream::setNumberFlags(NumberFlags flags)
{
Q_D(QTextStream);
d->params.numberFlags = flags;
}
/*!
Returns the current number flags.
\sa setNumberFlags(), integerBase(), realNumberNotation()
*/
QTextStream::NumberFlags QTextStream::numberFlags() const
{
Q_D(const QTextStream);
return d->params.numberFlags;
}
/*!
Sets the base of integers to \a base, both for reading and for
generating numbers. \a base can be either 2 (binary), 8 (octal),
10 (decimal) or 16 (hexadecimal). If \a base is 0, QTextStream
will attempt to detect the base by inspecting the data on the
stream. When generating numbers, QTextStream assumes base is 10
unless the base has been set explicitly.
\sa integerBase(), QString::number(), setNumberFlags()
*/
void QTextStream::setIntegerBase(int base)
{
Q_D(QTextStream);
d->params.integerBase = base;
}
/*!
Returns the current base of integers. 0 means that the base is
detected when reading, or 10 (decimal) when generating numbers.
\sa setIntegerBase(), QString::number(), numberFlags()
*/
int QTextStream::integerBase() const
{
Q_D(const QTextStream);
return d->params.integerBase;
}
/*!
Sets the real number notation to \a notation (SmartNotation,
FixedNotation, ScientificNotation). When reading and generating
numbers, QTextStream uses this value to detect the formatting of
real numbers.
\sa realNumberNotation(), setRealNumberPrecision(), setNumberFlags(), setIntegerBase()
*/
void QTextStream::setRealNumberNotation(RealNumberNotation notation)
{
Q_D(QTextStream);
d->params.realNumberNotation = notation;
}
/*!
Returns the current real number notation.
\sa setRealNumberNotation(), realNumberPrecision(), numberFlags(), integerBase()
*/
QTextStream::RealNumberNotation QTextStream::realNumberNotation() const
{
Q_D(const QTextStream);
return d->params.realNumberNotation;
}
/*!
Sets the precision of real numbers to \a precision. This value
describes the number of fraction digits QTextStream should
write when generating real numbers (FixedNotation, ScientificNotation), or
the maximum number of significant digits (SmartNotation).
The precision cannot be a negative value. The default value is 6.
\sa realNumberPrecision(), setRealNumberNotation()
*/
void QTextStream::setRealNumberPrecision(int precision)
{
Q_D(QTextStream);
if (precision < 0) {
qWarning("QTextStream::setRealNumberPrecision: Invalid precision (%d)", precision);
d->params.realNumberPrecision = 6;
return;
}
d->params.realNumberPrecision = precision;
}
/*!
Returns the current real number precision, or the number of fraction
digits QTextStream will write when generating real numbers
(FixedNotation, ScientificNotation), or the maximum number of significant
digits (SmartNotation).
\sa setRealNumberNotation(), realNumberNotation(), numberFlags(), integerBase()
*/
int QTextStream::realNumberPrecision() const
{
Q_D(const QTextStream);
return d->params.realNumberPrecision;
}
/*!
Returns the status of the text stream.
\sa QTextStream::Status, setStatus(), resetStatus()
*/
QTextStream::Status QTextStream::status() const
{
Q_D(const QTextStream);
return d->status;
}
/*!
\since 4.1
Resets the status of the text stream.
\sa QTextStream::Status, status(), setStatus()
*/
void QTextStream::resetStatus()
{
Q_D(QTextStream);
d->status = Ok;
}
/*!
\since 4.1
Sets the status of the text stream to the \a status given.
Subsequent calls to setStatus() are ignored until resetStatus()
is called.
\sa Status, status(), resetStatus()
*/
void QTextStream::setStatus(Status status)
{
Q_D(QTextStream);
if (d->status == Ok)
d->status = status;
}
/*!
Returns \c true if there is no more data to be read from the
QTextStream; otherwise returns \c false. This is similar to, but not
the same as calling QIODevice::atEnd(), as QTextStream also takes
into account its internal Unicode buffer.
*/
bool QTextStream::atEnd() const
{
Q_D(const QTextStream);
CHECK_VALID_STREAM(true);
if (d->string)
return d->string->size() == d->stringOffset;
return d->readBuffer.isEmpty() && d->device->atEnd();
}
/*!
Reads the entire content of the stream, and returns it as a
QString. Avoid this function when working on large files, as it
will consume a significant amount of memory.
Calling \l {QTextStream::readLine()}{readLine()} is better if you do not know how much data is
available.
\sa readLine()
*/
QString QTextStream::readAll()
{
Q_D(QTextStream);
CHECK_VALID_STREAM(QString());
return d->read(INT_MAX);
}
/*!
Reads one line of text from the stream, and returns it as a
QString. The maximum allowed line length is set to \a maxlen. If
the stream contains lines longer than this, then the lines will be
split after \a maxlen characters and returned in parts.
If \a maxlen is 0, the lines can be of any length.
The returned line has no trailing end-of-line characters ("\\n"
or "\\r\\n"), so calling QString::trimmed() can be unnecessary.
If the stream has read to the end of the file, \l {QTextStream::readLine()}{readLine()}
will return a null QString. For strings, or for devices that support it,
you can explicitly test for the end of the stream using atEnd().
\sa readAll(), QIODevice::readLine()
*/
QString QTextStream::readLine(qint64 maxlen)
{
QString line;
readLineInto(&line, maxlen);
return line;
}
/*!
\since 5.5
Reads one line of text from the stream into \a line.
If \a line is \nullptr, the read line is not stored.
The maximum allowed line length is set to \a maxlen. If
the stream contains lines longer than this, then the lines will be
split after \a maxlen characters and returned in parts.
If \a maxlen is 0, the lines can be of any length.
The resulting line has no trailing end-of-line characters ("\\n"
or "\\r\\n"), so calling QString::trimmed() can be unnecessary.
If \a line has sufficient capacity for the data that is about to be
read, this function may not need to allocate new memory. Because of
this, it can be faster than readLine().
Returns \c false if the stream has read to the end of the file or
an error has occurred; otherwise returns \c true. The contents in
\a line before the call are discarded in any case.
\sa readAll(), QIODevice::readLine()
*/
bool QTextStream::readLineInto(QString *line, qint64 maxlen)
{
Q_D(QTextStream);
// keep in sync with CHECK_VALID_STREAM
if (!d->string && !d->device) {
qWarning("QTextStream: No device");
if (line && !line->isNull())
line->resize(0);
return false;
}
const QChar *readPtr;
int length;
if (!d->scan(&readPtr, &length, int(maxlen), QTextStreamPrivate::EndOfLine)) {
if (line && !line->isNull())
line->resize(0);
return false;
}
if (Q_LIKELY(line))
line->setUnicode(readPtr, length);
d->consumeLastToken();
return true;
}
/*!
\since 4.1
Reads at most \a maxlen characters from the stream, and returns the data
read as a QString.
\sa readAll(), readLine(), QIODevice::read()
*/
QString QTextStream::read(qint64 maxlen)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(QString());
if (maxlen <= 0)
return QString::fromLatin1(""); // empty, not null
return d->read(int(maxlen));
}
/*!
\internal
*/
QTextStreamPrivate::NumberParsingStatus QTextStreamPrivate::getNumber(qulonglong *ret)
{
scan(nullptr, nullptr, 0, NotSpace);
consumeLastToken();
// detect int encoding
int base = params.integerBase;
if (base == 0) {
QChar ch;
if (!getChar(&ch))
return npsInvalidPrefix;
if (ch == u'0') {
QChar ch2;
if (!getChar(&ch2)) {
// Result is the number 0
*ret = 0;
return npsOk;
}
ch2 = ch2.toLower();
if (ch2 == u'x') {
base = 16;
} else if (ch2 == u'b') {
base = 2;
} else if (ch2.isDigit() && ch2.digitValue() >= 0 && ch2.digitValue() <= 7) {
base = 8;
} else {
base = 10;
}
ungetChar(ch2);
} else if (ch == locale.negativeSign() || ch == locale.positiveSign() || ch.isDigit()) {
base = 10;
} else {
ungetChar(ch);
return npsInvalidPrefix;
}
ungetChar(ch);
// State of the stream is now the same as on entry
// (cursor is at prefix),
// and local variable 'base' has been set appropriately.
}
qulonglong val=0;
switch (base) {
case 2: {
QChar pf1, pf2, dig;
// Parse prefix '0b'
if (!getChar(&pf1) || pf1 != u'0')
return npsInvalidPrefix;
if (!getChar(&pf2) || pf2.toLower() != u'b')
return npsInvalidPrefix;
// Parse digits
int ndigits = 0;
while (getChar(&dig)) {
int n = dig.toLower().unicode();
if (n == '0' || n == '1') {
val <<= 1;
val += n - '0';
} else {
ungetChar(dig);
break;
}
ndigits++;
}
if (ndigits == 0) {
// Unwind the prefix and abort
ungetChar(pf2);
ungetChar(pf1);
return npsMissingDigit;
}
break;
}
case 8: {
QChar pf, dig;
// Parse prefix '0'
if (!getChar(&pf) || pf != u'0')
return npsInvalidPrefix;
// Parse digits
int ndigits = 0;
while (getChar(&dig)) {
int n = dig.toLower().unicode();
if (isOctalDigit(n)) {
val *= 8;
val += n - '0';
} else {
ungetChar(dig);
break;
}
ndigits++;
}
if (ndigits == 0) {
// Unwind the prefix and abort
ungetChar(pf);
return npsMissingDigit;
}
break;
}
case 10: {
// Parse sign (or first digit)
QChar sign;
int ndigits = 0;
if (!getChar(&sign))
return npsMissingDigit;
if (sign != locale.negativeSign() && sign != locale.positiveSign()) {
if (!sign.isDigit()) {
ungetChar(sign);
return npsMissingDigit;
}
val += sign.digitValue();
ndigits++;
}
// Parse digits
QChar ch;
while (getChar(&ch)) {
if (ch.isDigit()) {
val *= 10;
val += ch.digitValue();
} else if (locale != QLocale::c() && ch == locale.groupSeparator()) {
continue;
} else {
ungetChar(ch);
break;
}
ndigits++;
}
if (ndigits == 0)
return npsMissingDigit;
if (sign == locale.negativeSign()) {
qlonglong ival = qlonglong(val);
if (ival > 0)
ival = -ival;
val = qulonglong(ival);
}
break;
}
case 16: {
QChar pf1, pf2, dig;
// Parse prefix ' 0x'
if (!getChar(&pf1) || pf1 != u'0')
return npsInvalidPrefix;
if (!getChar(&pf2) || pf2.toLower() != u'x')
return npsInvalidPrefix;
// Parse digits
int ndigits = 0;
while (getChar(&dig)) {
const int h = fromHex(dig.unicode());
if (h != -1) {
val <<= 4;
val += h;
} else {
ungetChar(dig);
break;
}
ndigits++;
}
if (ndigits == 0) {
return npsMissingDigit;
}
break;
}
default:
// Unsupported integerBase
return npsInvalidPrefix;
}
if (ret)
*ret = val;
return npsOk;
}
/*!
\internal
(hihi)
*/
bool QTextStreamPrivate::getReal(double *f)
{
// We use a table-driven FSM to parse floating point numbers
// strtod() cannot be used directly since we may be reading from a
// QIODevice.
enum ParserState {
Init = 0,
Sign = 1,
Mantissa = 2,
Dot = 3,
Abscissa = 4,
ExpMark = 5,
ExpSign = 6,
Exponent = 7,
Nan1 = 8,
Nan2 = 9,
Inf1 = 10,
Inf2 = 11,
NanInf = 12,
Done = 13
};
enum InputToken {
None = 0,
InputSign = 1,
InputDigit = 2,
InputDot = 3,
InputExp = 4,
InputI = 5,
InputN = 6,
InputF = 7,
InputA = 8,
InputT = 9
};
static const uchar table[13][10] = {
// None InputSign InputDigit InputDot InputExp InputI InputN InputF InputA InputT
{ 0, Sign, Mantissa, Dot, 0, Inf1, Nan1, 0, 0, 0 }, // 0 Init
{ 0, 0, Mantissa, Dot, 0, Inf1, Nan1, 0, 0, 0 }, // 1 Sign
{ Done, Done, Mantissa, Dot, ExpMark, 0, 0, 0, 0, 0 }, // 2 Mantissa
{ 0, 0, Abscissa, 0, 0, 0, 0, 0, 0, 0 }, // 3 Dot
{ Done, Done, Abscissa, Done, ExpMark, 0, 0, 0, 0, 0 }, // 4 Abscissa
{ 0, ExpSign, Exponent, 0, 0, 0, 0, 0, 0, 0 }, // 5 ExpMark
{ 0, 0, Exponent, 0, 0, 0, 0, 0, 0, 0 }, // 6 ExpSign
{ Done, Done, Exponent, Done, Done, 0, 0, 0, 0, 0 }, // 7 Exponent
{ 0, 0, 0, 0, 0, 0, 0, 0, Nan2, 0 }, // 8 Nan1
{ 0, 0, 0, 0, 0, 0, NanInf, 0, 0, 0 }, // 9 Nan2
{ 0, 0, 0, 0, 0, 0, Inf2, 0, 0, 0 }, // 10 Inf1
{ 0, 0, 0, 0, 0, 0, 0, NanInf, 0, 0 }, // 11 Inf2
{ Done, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // 11 NanInf
};
ParserState state = Init;
InputToken input = None;
scan(nullptr, nullptr, 0, NotSpace);
consumeLastToken();
const int BufferSize = 128;
char buf[BufferSize];
int i = 0;
QChar c;
while (getChar(&c)) {
switch (c.unicode()) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
input = InputDigit;
break;
case 'i': case 'I':
input = InputI;
break;
case 'n': case 'N':
input = InputN;
break;
case 'f': case 'F':
input = InputF;
break;
case 'a': case 'A':
input = InputA;
break;
case 't': case 'T':
input = InputT;
break;
default: {
QChar lc = c.toLower();
if (lc == locale.decimalPoint().toLower())
input = InputDot;
else if (lc == locale.exponential().toLower())
input = InputExp;
else if (lc == locale.negativeSign().toLower()
|| lc == locale.positiveSign().toLower())
input = InputSign;
else if (locale != QLocale::c() // backward-compatibility
&& lc == locale.groupSeparator().toLower())
input = InputDigit; // well, it isn't a digit, but no one cares.
else
input = None;
}
break;
}
state = ParserState(table[state][input]);
if (state == Init || state == Done || i > (BufferSize - 5)) {
ungetChar(c);
if (i > (BufferSize - 5)) { // ignore rest of digits
while (getChar(&c)) {
if (!c.isDigit()) {
ungetChar(c);
break;
}
}
}
break;
}
buf[i++] = c.toLatin1();
}
if (i == 0)
return false;
if (!f)
return true;
buf[i] = '\0';
// backward-compatibility. Old implementation supported +nan/-nan
// for some reason. QLocale only checks for lower-case
// nan/+inf/-inf, so here we also check for uppercase and mixed
// case versions.
if (!qstricmp(buf, "nan") || !qstricmp(buf, "+nan") || !qstricmp(buf, "-nan")) {
*f = qQNaN();
return true;
} else if (!qstricmp(buf, "+inf") || !qstricmp(buf, "inf")) {
*f = qInf();
return true;
} else if (!qstricmp(buf, "-inf")) {
*f = -qInf();
return true;
}
bool ok;
*f = locale.toDouble(QString::fromLatin1(buf), &ok);
return ok;
}
/*!
Reads a character from the stream and stores it in \a c. Returns a
reference to the QTextStream, so several operators can be
nested. Example:
\snippet code/src_corelib_io_qtextstream.cpp 7
Whitespace is \e not skipped.
*/
QTextStream &QTextStream::operator>>(QChar &c)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->scan(nullptr, nullptr, 0, QTextStreamPrivate::NotSpace);
if (!d->getChar(&c))
setStatus(ReadPastEnd);
return *this;
}
/*!
\overload
Reads a character from the stream and stores it in \a c. The
character from the stream is converted to ISO-5589-1 before it is
stored.
\sa QChar::toLatin1()
*/
QTextStream &QTextStream::operator>>(char &c)
{
QChar ch;
*this >> ch;
c = ch.toLatin1();
return *this;
}
/*!
\fn QTextStream &QTextStream::operator>>(char16_t &c)
\overload
\since 6.4
Reads a character from the stream and stores it in \a c.
*/
/*!
Reads an integer from the stream and stores it in \a i, then
returns a reference to the QTextStream. The number is cast to
the correct type before it is stored. If no number was detected on
the stream, \a i is set to 0.
By default, QTextStream will attempt to detect the base of the
number using the following rules:
\table
\header \li Prefix \li Base
\row \li "0b" or "0B" \li 2 (binary)
\row \li "0" followed by "0-7" \li 8 (octal)
\row \li "0" otherwise \li 10 (decimal)
\row \li "0x" or "0X" \li 16 (hexadecimal)
\row \li "1" to "9" \li 10 (decimal)
\endtable
By calling setIntegerBase(), you can specify the integer base
explicitly. This will disable the auto-detection, and speed up
QTextStream slightly.
Leading whitespace is skipped.
*/
QTextStream &QTextStream::operator>>(signed short &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(signed short);
}
/*!
\overload
Stores the integer in the unsigned short \a i.
*/
QTextStream &QTextStream::operator>>(unsigned short &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(unsigned short);
}
/*!
\overload
Stores the integer in the signed int \a i.
*/
QTextStream &QTextStream::operator>>(signed int &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(signed int);
}
/*!
\overload
Stores the integer in the unsigned int \a i.
*/
QTextStream &QTextStream::operator>>(unsigned int &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(unsigned int);
}
/*!
\overload
Stores the integer in the signed long \a i.
*/
QTextStream &QTextStream::operator>>(signed long &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(signed long);
}
/*!
\overload
Stores the integer in the unsigned long \a i.
*/
QTextStream &QTextStream::operator>>(unsigned long &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(unsigned long);
}
/*!
\overload
Stores the integer in the qlonglong \a i.
*/
QTextStream &QTextStream::operator>>(qlonglong &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(qlonglong);
}
/*!
\overload
Stores the integer in the qulonglong \a i.
*/
QTextStream &QTextStream::operator>>(qulonglong &i)
{
IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(qulonglong);
}
/*!
Reads a real number from the stream and stores it in \a f, then
returns a reference to the QTextStream. The number is cast to
the correct type. If no real number is detect on the stream, \a f
is set to 0.0.
As a special exception, QTextStream allows the strings "nan" and "inf" to
represent NAN and INF floats or doubles.
Leading whitespace is skipped.
*/
QTextStream &QTextStream::operator>>(float &f)
{
IMPLEMENT_STREAM_RIGHT_REAL_OPERATOR(float);
}
/*!
\overload
Stores the real number in the double \a f.
*/
QTextStream &QTextStream::operator>>(double &f)
{
IMPLEMENT_STREAM_RIGHT_REAL_OPERATOR(double);
}
/*!
Reads a word from the stream and stores it in \a str, then returns
a reference to the stream. Words are separated by whitespace
(i.e., all characters for which QChar::isSpace() returns \c true).
Leading whitespace is skipped.
*/
QTextStream &QTextStream::operator>>(QString &str)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
str.clear();
d->scan(nullptr, nullptr, 0, QTextStreamPrivate::NotSpace);
d->consumeLastToken();
const QChar *ptr;
int length;
if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
setStatus(ReadPastEnd);
return *this;
}
str = QString(ptr, length);
d->consumeLastToken();
return *this;
}
/*!
\overload
Converts the word to UTF-8, then stores it in \a array.
\sa QString::toLatin1()
*/
QTextStream &QTextStream::operator>>(QByteArray &array)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->scan(nullptr, nullptr, 0, QTextStreamPrivate::NotSpace);
d->consumeLastToken();
const QChar *ptr;
int length;
if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
setStatus(ReadPastEnd);
array.clear();
return *this;
}
array = QStringView(ptr, length).toUtf8();
d->consumeLastToken();
return *this;
}
/*!
\overload
Converts the word to UTF-8 and stores it in \a c, terminated by a '\\0'
character. If no word is available, only the '\\0' character is stored.
Warning: Although convenient, this operator is dangerous and must
be used with care. QTextStream assumes that \a c points to a
buffer with enough space to hold the word. If the buffer is too
small, your application may crash. For a word consisting of \c{n} QChars,
the buffer needs to be at least \c{3*n+1} characters long.
If possible, use the QByteArray operator instead.
*/
QTextStream &QTextStream::operator>>(char *c)
{
Q_D(QTextStream);
*c = 0;
CHECK_VALID_STREAM(*this);
d->scan(nullptr, nullptr, 0, QTextStreamPrivate::NotSpace);
d->consumeLastToken();
const QChar *ptr;
int length;
if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
setStatus(ReadPastEnd);
return *this;
}
QStringEncoder encoder(QStringConverter::Utf8);
char *e = encoder.appendToBuffer(c, QStringView(ptr, length));
*e = '\0';
d->consumeLastToken();
return *this;
}
/*!
\internal
*/
void QTextStreamPrivate::putNumber(qulonglong number, bool negative)
{
QString result;
unsigned flags = 0;
const QTextStream::NumberFlags numberFlags = params.numberFlags;
if (numberFlags & QTextStream::ShowBase)
flags |= QLocaleData::ShowBase;
if (numberFlags & QTextStream::ForceSign)
flags |= QLocaleData::AlwaysShowSign;
if (numberFlags & QTextStream::UppercaseBase)
flags |= QLocaleData::UppercaseBase;
if (numberFlags & QTextStream::UppercaseDigits)
flags |= QLocaleData::CapitalEorX;
// add thousands group separators. For backward compatibility we
// don't add a group separator for C locale.
if (locale != QLocale::c() && !locale.numberOptions().testFlag(QLocale::OmitGroupSeparator))
flags |= QLocaleData::GroupDigits;
const QLocaleData *dd = locale.d->m_data;
int base = params.integerBase ? params.integerBase : 10;
if (negative && base == 10) {
result = dd->longLongToString(-static_cast<qlonglong>(number), -1,
base, -1, flags);
} else if (negative) {
// Workaround for backward compatibility for writing negative
// numbers in octal and hex:
// QTextStream(result) << Qt::showbase << Qt::hex << -1 << oct << -1
// should output: -0x1 -0b1
result = dd->unsLongLongToString(number, -1, base, -1, flags);
result.prepend(locale.negativeSign());
} else {
result = dd->unsLongLongToString(number, -1, base, -1, flags);
// workaround for backward compatibility - in octal form with
// ShowBase flag set zero should be written as '00'
if (number == 0 && base == 8 && params.numberFlags & QTextStream::ShowBase
&& result == "0"_L1) {
result.prepend(u'0');
}
}
putString(result, true);
}
/*!
Writes the character \a c to the stream, then returns a reference
to the QTextStream.
\sa setFieldWidth()
*/
QTextStream &QTextStream::operator<<(QChar c)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putChar(c);
return *this;
}
/*!
\overload
Converts \a c from ASCII to a QChar, then writes it to the stream.
*/
QTextStream &QTextStream::operator<<(char c)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putChar(QChar::fromLatin1(c));
return *this;
}
/*!
\fn QTextStream &QTextStream::operator<<(char16_t c)
\overload
\since 6.3.1
Writes the Unicode character \a c to the stream, then returns a
reference to the QTextStream.
*/
/*!
Writes the integer number \a i to the stream, then returns a
reference to the QTextStream. By default, the number is stored in
decimal form, but you can also set the base by calling
setIntegerBase().
\sa setFieldWidth(), setNumberFlags()
*/
QTextStream &QTextStream::operator<<(signed short i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
return *this;
}
/*!
\overload
Writes the unsigned short \a i to the stream.
*/
QTextStream &QTextStream::operator<<(unsigned short i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)i, false);
return *this;
}
/*!
\overload
Writes the signed int \a i to the stream.
*/
QTextStream &QTextStream::operator<<(signed int i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
return *this;
}
/*!
\overload
Writes the unsigned int \a i to the stream.
*/
QTextStream &QTextStream::operator<<(unsigned int i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)i, false);
return *this;
}
/*!
\overload
Writes the signed long \a i to the stream.
*/
QTextStream &QTextStream::operator<<(signed long i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
return *this;
}
/*!
\overload
Writes the unsigned long \a i to the stream.
*/
QTextStream &QTextStream::operator<<(unsigned long i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)i, false);
return *this;
}
/*!
\overload
Writes the qlonglong \a i to the stream.
*/
QTextStream &QTextStream::operator<<(qlonglong i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber((qulonglong)qAbs(i), i < 0);
return *this;
}
/*!
\overload
Writes the qulonglong \a i to the stream.
*/
QTextStream &QTextStream::operator<<(qulonglong i)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putNumber(i, false);
return *this;
}
/*!
Writes the real number \a f to the stream, then returns a
reference to the QTextStream. By default, QTextStream stores it
using SmartNotation, with up to 6 digits of precision. You can
change the textual representation QTextStream will use for real
numbers by calling setRealNumberNotation(),
setRealNumberPrecision() and setNumberFlags().
\sa setFieldWidth(), setRealNumberNotation(),
setRealNumberPrecision(), setNumberFlags()
*/
QTextStream &QTextStream::operator<<(float f)
{
return *this << double(f);
}
/*!
\overload
Writes the double \a f to the stream.
*/
QTextStream &QTextStream::operator<<(double f)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
QLocaleData::DoubleForm form = QLocaleData::DFDecimal;
switch (realNumberNotation()) {
case FixedNotation:
form = QLocaleData::DFDecimal;
break;
case ScientificNotation:
form = QLocaleData::DFExponent;
break;
case SmartNotation:
form = QLocaleData::DFSignificantDigits;
break;
}
uint flags = 0;
const QLocale::NumberOptions numberOptions = locale().numberOptions();
if (numberFlags() & ShowBase)
flags |= QLocaleData::ShowBase;
if (numberFlags() & ForceSign)
flags |= QLocaleData::AlwaysShowSign;
if (numberFlags() & UppercaseBase)
flags |= QLocaleData::UppercaseBase;
if (numberFlags() & UppercaseDigits)
flags |= QLocaleData::CapitalEorX;
if (numberFlags() & ForcePoint) {
flags |= QLocaleData::ForcePoint;
// Only for backwards compatibility
flags |= QLocaleData::AddTrailingZeroes | QLocaleData::ShowBase;
}
if (locale() != QLocale::c() && !(numberOptions & QLocale::OmitGroupSeparator))
flags |= QLocaleData::GroupDigits;
if (!(numberOptions & QLocale::OmitLeadingZeroInExponent))
flags |= QLocaleData::ZeroPadExponent;
if (numberOptions & QLocale::IncludeTrailingZeroesAfterDot)
flags |= QLocaleData::AddTrailingZeroes;
const QLocaleData *dd = d->locale.d->m_data;
QString num = dd->doubleToString(f, d->params.realNumberPrecision, form, -1, flags);
d->putString(num, true);
return *this;
}
/*!
Writes the string \a string to the stream, and returns a reference
to the QTextStream. The string is first encoded using the assigned
encoding (the default is UTF-8) before it is written to the stream.
\sa setFieldWidth(), setEncoding()
*/
QTextStream &QTextStream::operator<<(const QString &string)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putString(string);
return *this;
}
/*!
\overload
Writes \a string to the stream, and returns a reference to the
QTextStream.
\since 5.12
*/
QTextStream &QTextStream::operator<<(QStringView string)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putString(string.cbegin(), int(string.size()));
return *this;
}
/*!
\overload
Writes \a string to the stream, and returns a reference to the
QTextStream.
*/
QTextStream &QTextStream::operator<<(QLatin1StringView string)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putString(string);
return *this;
}
/*!
\overload
Writes \a array to the stream. The contents of \a array are
converted with QString::fromUtf8().
*/
QTextStream &QTextStream::operator<<(const QByteArray &array)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putString(QString::fromUtf8(array.constData(), array.size()));
return *this;
}
/*!
\overload
Writes the constant string pointed to by \a string to the stream. \a
string is assumed to be in UTF-8 encoding. This operator
is convenient when working with constant string data. Example:
\snippet code/src_corelib_io_qtextstream.cpp 8
Warning: QTextStream assumes that \a string points to a string of
text, terminated by a '\\0' character. If there is no terminating
'\\0' character, your application may crash.
*/
QTextStream &QTextStream::operator<<(const char *string)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
d->putString(QUtf8StringView(string));
return *this;
}
/*!
\overload
Writes \a ptr to the stream as a hexadecimal number with a base.
*/
QTextStream &QTextStream::operator<<(const void *ptr)
{
Q_D(QTextStream);
CHECK_VALID_STREAM(*this);
const int oldBase = d->params.integerBase;
const NumberFlags oldFlags = d->params.numberFlags;
d->params.integerBase = 16;
d->params.numberFlags |= ShowBase;
d->putNumber(reinterpret_cast<quintptr>(ptr), false);
d->params.integerBase = oldBase;
d->params.numberFlags = oldFlags;
return *this;
}
namespace Qt {
/*!
Calls QTextStream::setIntegerBase(2) on \a stream and returns \a
stream.
\since 5.14
\sa oct(), dec(), hex(), {QTextStream manipulators}
*/
QTextStream &bin(QTextStream &stream)
{
stream.setIntegerBase(2);
return stream;
}
/*!
Calls QTextStream::setIntegerBase(8) on \a stream and returns \a
stream.
\since 5.14
\sa bin(), dec(), hex(), {QTextStream manipulators}
*/
QTextStream &oct(QTextStream &stream)
{
stream.setIntegerBase(8);
return stream;
}
/*!
Calls QTextStream::setIntegerBase(10) on \a stream and returns \a
stream.
\since 5.14
\sa bin(), oct(), hex(), {QTextStream manipulators}
*/
QTextStream &dec(QTextStream &stream)
{
stream.setIntegerBase(10);
return stream;
}
/*!
Calls QTextStream::setIntegerBase(16) on \a stream and returns \a
stream.
\since 5.14
\note The hex modifier can only be used for writing to streams.
\sa bin(), oct(), dec(), {QTextStream manipulators}
*/
QTextStream &hex(QTextStream &stream)
{
stream.setIntegerBase(16);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
QTextStream::ShowBase) on \a stream and returns \a stream.
\since 5.14
\sa noshowbase(), forcesign(), forcepoint(), {QTextStream manipulators}
*/
QTextStream &showbase(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() | QTextStream::ShowBase);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
QTextStream::ForceSign) on \a stream and returns \a stream.
\since 5.14
\sa noforcesign(), forcepoint(), showbase(), {QTextStream manipulators}
*/
QTextStream &forcesign(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() | QTextStream::ForceSign);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
QTextStream::ForcePoint) on \a stream and returns \a stream.
\since 5.14
\sa noforcepoint(), forcesign(), showbase(), {QTextStream manipulators}
*/
QTextStream &forcepoint(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() | QTextStream::ForcePoint);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
~QTextStream::ShowBase) on \a stream and returns \a stream.
\since 5.14
\sa showbase(), noforcesign(), noforcepoint(), {QTextStream manipulators}
*/
QTextStream &noshowbase(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ShowBase);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
~QTextStream::ForceSign) on \a stream and returns \a stream.
\since 5.14
\sa forcesign(), noforcepoint(), noshowbase(), {QTextStream manipulators}
*/
QTextStream &noforcesign(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ForceSign);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
~QTextStream::ForcePoint) on \a stream and returns \a stream.
\since 5.14
\sa forcepoint(), noforcesign(), noshowbase(), {QTextStream manipulators}
*/
QTextStream &noforcepoint(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ForcePoint);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
QTextStream::UppercaseBase) on \a stream and returns \a stream.
\since 5.14
\sa lowercasebase(), uppercasedigits(), {QTextStream manipulators}
*/
QTextStream &uppercasebase(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() | QTextStream::UppercaseBase);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
QTextStream::UppercaseDigits) on \a stream and returns \a stream.
\since 5.14
\sa lowercasedigits(), uppercasebase(), {QTextStream manipulators}
*/
QTextStream &uppercasedigits(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() | QTextStream::UppercaseDigits);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
~QTextStream::UppercaseBase) on \a stream and returns \a stream.
\since 5.14
\sa uppercasebase(), lowercasedigits(), {QTextStream manipulators}
*/
QTextStream &lowercasebase(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() & ~QTextStream::UppercaseBase);
return stream;
}
/*!
Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
~QTextStream::UppercaseDigits) on \a stream and returns \a stream.
\since 5.14
\sa uppercasedigits(), lowercasebase(), {QTextStream manipulators}
*/
QTextStream &lowercasedigits(QTextStream &stream)
{
stream.setNumberFlags(stream.numberFlags() & ~QTextStream::UppercaseDigits);
return stream;
}
/*!
Calls QTextStream::setRealNumberNotation(QTextStream::FixedNotation)
on \a stream and returns \a stream.
\since 5.14
\sa scientific(), {QTextStream manipulators}
*/
QTextStream &fixed(QTextStream &stream)
{
stream.setRealNumberNotation(QTextStream::FixedNotation);
return stream;
}
/*!
Calls QTextStream::setRealNumberNotation(QTextStream::ScientificNotation)
on \a stream and returns \a stream.
\since 5.14
\sa fixed(), {QTextStream manipulators}
*/
QTextStream &scientific(QTextStream &stream)
{
stream.setRealNumberNotation(QTextStream::ScientificNotation);
return stream;
}
/*!
Calls QTextStream::setFieldAlignment(QTextStream::AlignLeft)
on \a stream and returns \a stream.
\since 5.14
\sa right(), center(), {QTextStream manipulators}
*/
QTextStream &left(QTextStream &stream)
{
stream.setFieldAlignment(QTextStream::AlignLeft);
return stream;
}
/*!
Calls QTextStream::setFieldAlignment(QTextStream::AlignRight)
on \a stream and returns \a stream.
\since 5.14
\sa left(), center(), {QTextStream manipulators}
*/
QTextStream &right(QTextStream &stream)
{
stream.setFieldAlignment(QTextStream::AlignRight);
return stream;
}
/*!
Calls QTextStream::setFieldAlignment(QTextStream::AlignCenter)
on \a stream and returns \a stream.
\since 5.14
\sa left(), right(), {QTextStream manipulators}
*/
QTextStream &center(QTextStream &stream)
{
stream.setFieldAlignment(QTextStream::AlignCenter);
return stream;
}
/*!
Writes '\\n' to the \a stream and flushes the stream.
Equivalent to
\snippet code/src_corelib_io_qtextstream.cpp 9
Note: On Windows, all '\\n' characters are written as '\\r\\n' if
QTextStream's device or string is opened using the QIODevice::Text flag.
\since 5.14
\sa flush(), reset(), {QTextStream manipulators}
*/
QTextStream &endl(QTextStream &stream)
{
return stream << '\n'_L1 << Qt::flush;
}
/*!
Calls QTextStream::flush() on \a stream and returns \a stream.
\since 5.14
\sa endl(), reset(), {QTextStream manipulators}
*/
QTextStream &flush(QTextStream &stream)
{
stream.flush();
return stream;
}
/*!
Calls QTextStream::reset() on \a stream and returns \a stream.
\since 5.14
\sa flush(), {QTextStream manipulators}
*/
QTextStream &reset(QTextStream &stream)
{
stream.reset();
return stream;
}
/*!
Calls \l {QTextStream::}{skipWhiteSpace()} on \a stream and returns \a stream.
\since 5.14
\sa {QTextStream manipulators}
*/
QTextStream &ws(QTextStream &stream)
{
stream.skipWhiteSpace();
return stream;
}
} // namespace Qt
/*!
\fn QTextStreamManipulator qSetFieldWidth(int width)
\relates QTextStream
Equivalent to QTextStream::setFieldWidth(\a width).
*/
/*!
\fn QTextStreamManipulator qSetPadChar(QChar ch)
\relates QTextStream
Equivalent to QTextStream::setPadChar(\a ch).
*/
/*!
\fn QTextStreamManipulator qSetRealNumberPrecision(int precision)
\relates QTextStream
Equivalent to QTextStream::setRealNumberPrecision(\a precision).
*/
namespace Qt {
/*!
Toggles insertion of the Byte Order Mark on \a stream when QTextStream is
used with a UTF encoding.
\since 5.14
\sa QTextStream::setGenerateByteOrderMark(), {QTextStream manipulators}
*/
QTextStream &bom(QTextStream &stream)
{
stream.setGenerateByteOrderMark(true);
return stream;
}
} // namespace Qt
/*!
Sets the encoding for this stream to \a encoding. The encoding is used for
decoding any data that is read from the assigned device, and for
encoding any data that is written. By default,
QStringConverter::Utf8 is used, and automatic unicode
detection is enabled.
If QTextStream operates on a string, this function does nothing.
\warning If you call this function while the text stream is reading
from an open sequential socket, the internal buffer may still contain
text decoded using the old encoding.
\sa encoding(), setAutoDetectUnicode(), setLocale()
*/
void QTextStream::setEncoding(QStringConverter::Encoding encoding)
{
Q_D(QTextStream);
if (d->encoding == encoding)
return;
qint64 seekPos = -1;
if (!d->readBuffer.isEmpty()) {
if (!d->device->isSequential()) {
seekPos = pos();
}
}
d->encoding = encoding;
d->toUtf16 = QStringDecoder(d->encoding);
bool generateBOM = !d->hasWrittenData && d->generateBOM;
d->fromUtf16 = QStringEncoder(d->encoding,
generateBOM ? QStringEncoder::Flag::WriteBom : QStringEncoder::Flag::Default);
if (seekPos >=0 && !d->readBuffer.isEmpty())
seek(seekPos);
}
/*!
Returns the encoding that is current assigned to the stream.
\sa setEncoding(), setAutoDetectUnicode(), locale()
*/
QStringConverter::Encoding QTextStream::encoding() const
{
Q_D(const QTextStream);
return d->encoding;
}
/*!
If \a enabled is true, QTextStream will attempt to detect Unicode encoding
by peeking into the stream data to see if it can find the UTF-8, UTF-16, or
UTF-32 Byte Order Mark (BOM). If this mark is found, QTextStream will
replace the current encoding with the UTF encoding.
This function can be used together with setEncoding(). It is common
to set the encoding to UTF-8, and then enable UTF-16 detection.
\sa autoDetectUnicode(), setEncoding()
*/
void QTextStream::setAutoDetectUnicode(bool enabled)
{
Q_D(QTextStream);
d->autoDetectUnicode = enabled;
}
/*!
Returns \c true if automatic Unicode detection is enabled, otherwise
returns \c false. Automatic Unicode detection is enabled by default.
\sa setAutoDetectUnicode(), setEncoding()
*/
bool QTextStream::autoDetectUnicode() const
{
Q_D(const QTextStream);
return d->autoDetectUnicode;
}
/*!
If \a generate is true and a UTF encoding is used, QTextStream will insert
the BOM (Byte Order Mark) before any data has been written to the
device. If \a generate is false, no BOM will be inserted. This function
must be called before any data is written. Otherwise, it does nothing.
\sa generateByteOrderMark(), {Qt::}{bom()}
*/
void QTextStream::setGenerateByteOrderMark(bool generate)
{
Q_D(QTextStream);
if (d->hasWrittenData || d->generateBOM == generate)
return;
d->generateBOM = generate;
d->fromUtf16 = QStringEncoder(d->encoding, generate ? QStringConverter::Flag::WriteBom : QStringConverter::Flag::Default);
}
/*!
Returns \c true if QTextStream is set to generate the UTF BOM (Byte Order
Mark) when using a UTF encoding; otherwise returns \c false. UTF BOM generation is
set to false by default.
\sa setGenerateByteOrderMark()
*/
bool QTextStream::generateByteOrderMark() const
{
Q_D(const QTextStream);
return d->generateBOM;
}
/*!
\since 4.5
Sets the locale for this stream to \a locale. The specified locale is
used for conversions between numbers and their string representations.
The default locale is C and it is a special case - the thousands
group separator is not used for backward compatibility reasons.
\sa locale()
*/
void QTextStream::setLocale(const QLocale &locale)
{
Q_D(QTextStream);
d->locale = locale;
}
/*!
\since 4.5
Returns the locale for this stream. The default locale is C.
\sa setLocale()
*/
QLocale QTextStream::locale() const
{
Q_D(const QTextStream);
return d->locale;
}
QT_END_NAMESPACE
#ifndef QT_NO_QOBJECT
#include "moc_qtextstream_p.cpp"
#endif
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