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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 193 insertions, 0 deletions

diff --git a/src/corelib/tools/qstringbuilder.cpp b/src/corelib/tools/qstringbuilder.cpp
new file mode 100644
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+++ b/src/corelib/tools/qstringbuilder.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qstringbuilder.h"
+#include <QtCore/qtextcodec.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QLatin1Literal
+    \internal
+    \reentrant
+    \since 4.6
+
+    \brief The QLatin1Literal class provides a thin wrapper around string
+    literals used in source code.
+
+    \ingroup tools
+    \ingroup shared
+    \ingroup string-processing
+
+
+    Unlike \c QLatin1String, a \c QLatin1Literal can retrieve its size
+    without iterating over the literal.
+
+    The main use of \c QLatin1Literal is in conjunction with \c QStringBuilder
+    to reduce the number of reallocations needed to build up a string from
+    smaller chunks.
+
+    \sa QStringBuilder, QLatin1String, QString, QStringRef
+*/
+
+/*! \fn int QLatin1Literal::size() const
+ 
+    Returns the number of characters in the literal \e{excluding} the trailing
+    NULL char.
+*/
+
+/*! \fn QLatin1Literal::QLatin1Literal(const char str)
+ 
+    Constructs a new literal from the string \a str.
+*/
+
+/*! \fn const char *QLatin1Literal::data() const
+ 
+    Returns a pointer to the first character of the string literal.
+    The string literal is terminated by a NUL character.
+*/
+
+/*!
+    \class QStringBuilder
+    \internal
+    \reentrant
+    \since 4.6
+
+    \brief The QStringBuilder class is a template class that provides a facility to build up QStrings from smaller chunks.
+
+    \ingroup tools
+    \ingroup shared
+    \ingroup string-processing
+
+
+    To build a QString by multiple concatenations, QString::operator+()
+    is typically used. This causes \e{n - 1} reallocations when building
+    a string from \e{n} chunks.
+
+    QStringBuilder uses expression templates to collect the individual
+    chunks, compute the total size, allocate the required amount of
+    memory for the final QString object, and copy the chunks into the
+    allocated memory.
+
+    The QStringBuilder class is not to be used explicitly in user
+    code.  Instances of the class are created as return values of the
+    operator%() function, acting on objects of type QString,
+    QLatin1String, QLatin1Literal, QStringRef, QChar, QCharRef,
+    QLatin1Char, and \c char.
+
+    Concatenating strings with operator%() generally yields better
+    performance then using \c QString::operator+() on the same chunks
+    if there are three or more of them, and performs equally well in other
+    cases.
+
+    \sa QLatin1Literal, QString
+*/
+
+/*! \fn QStringBuilder::QStringBuilder(const A &a, const B &b)
+  Constructs a QStringBuilder from \a a and \a b.
+ */
+
+/* \fn QStringBuilder::operator%(const A &a, const B &b)
+
+    Returns a \c QStringBuilder object that is converted to a QString object
+    when assigned to a variable of QString type or passed to a function that
+    takes a QString parameter.
+
+    This function is usable with arguments of type \c QString,
+    \c QLatin1String, \c QLatin1Literal, \c QStringRef, 
+    \c QChar, \c QCharRef, \c QLatin1Char, and \c char.
+*/
+
+/*! \fn QByteArray QStringBuilder::toLatin1() const
+  Returns a Latin-1 representation of the string as a QByteArray.  The
+  returned byte array is undefined if the string contains non-Latin1
+  characters.
+ */
+
+/*! \fn QStringBuilder::operator QString() const
+ 
+    Converts the \c QLatin1Literal into a \c QString object.
+*/
+
+/*! \internal
+   Note: The len contains the ending \0
+ */
+void QAbstractConcatenable::convertFromAscii(const char *a, int len, QChar *&out)
+{
+#ifndef QT_NO_TEXTCODEC
+    if (QString::codecForCStrings && len) {
+        QString tmp = QString::fromAscii(a, len > 0 ? len - 1 : -1);
+        memcpy(out, reinterpret_cast<const char *>(tmp.constData()), sizeof(QChar) * tmp.size());
+        out += tmp.length();
+        return;
+    }
+#endif
+    if (len == -1) {
+        while (*a)
+            *out++ = QLatin1Char(*a++);
+    } else {
+        for (int i = 0; i < len - 1; ++i)
+            *out++ = QLatin1Char(a[i]);
+    }
+}
+
+/*! \internal */
+void QAbstractConcatenable::convertToAscii(const QChar* a, int len, char*& out) 
+{
+#ifndef QT_NO_TEXTCODEC
+    if (QString::codecForCStrings) {
+        QByteArray tmp = QString::codecForCStrings->fromUnicode(a, len);
+        memcpy(out, tmp.constData(), tmp.size());
+        out += tmp.length();
+        return;
+    }
+#endif
+    if (len == -1) {
+        while (a->unicode())
+            convertToLatin1(*a++, out);
+    } else {
+        for (int i = 0; i < len; ++i)
+            convertToLatin1(a[i], out);
+    }
+}
+
+
+QT_END_NAMESPACE