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458 lines
14 KiB
C++
458 lines
14 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QSTRINGBUILDER_H
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#define QSTRINGBUILDER_H
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#include <QtCore/qstring.h>
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#include <QtCore/qbytearray.h>
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#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL)
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# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ == 0)
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# include <QtCore/qmap.h>
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# endif
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#endif
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#include <string.h>
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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// ### Qt 5: merge with QLatin1String
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class QLatin1Literal
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{
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public:
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int size() const { return m_size; }
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const char *data() const { return m_data; }
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template <int N>
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QLatin1Literal(const char (&str)[N])
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: m_size(N - 1), m_data(str) {}
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private:
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const int m_size;
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const char * const m_data;
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};
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struct Q_CORE_EXPORT QAbstractConcatenable
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{
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protected:
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static void convertFromAscii(const char *a, int len, QChar *&out);
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static void convertToAscii(const QChar *a, int len, char *&out);
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static inline void convertFromAscii(char a, QChar *&out)
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{
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#ifndef QT_NO_TEXTCODEC
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if (QString::codecForCStrings)
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*out++ = QChar::fromAscii(a);
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else
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#endif
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*out++ = QLatin1Char(a);
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}
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static inline void convertToAscii(QChar a, char *&out)
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{
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#ifndef QT_NO_TEXTCODEC
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if (QString::codecForCStrings)
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*out++ = a.toAscii(); //###
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else
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#endif
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convertToLatin1(a, out);
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}
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static inline void convertToLatin1(QChar a, char *&out)
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{
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*out++ = a.unicode() > 0xff ? '?' : char(a.unicode());
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}
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};
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template <typename T> struct QConcatenable {};
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template <typename A, typename B>
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class QStringBuilder
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{
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public:
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QStringBuilder(const A &a_, const B &b_) : a(a_), b(b_) {}
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private:
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friend class QByteArray;
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friend class QString;
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template <typename T> T convertTo() const
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{
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const uint len = QConcatenable< QStringBuilder<A, B> >::size(*this);
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T s(len, Qt::Uninitialized);
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typename T::iterator d = s.data();
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typename T::const_iterator const start = d;
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QConcatenable< QStringBuilder<A, B> >::appendTo(*this, d);
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if (!QConcatenable< QStringBuilder<A, B> >::ExactSize && int(len) != d - start) {
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// this resize is necessary since we allocate a bit too much
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// when dealing with variable sized 8-bit encodings
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s.resize(d - start);
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}
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return s;
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}
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typedef QConcatenable<QStringBuilder<A, B> > Concatenable;
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typedef typename Concatenable::ConvertTo ConvertTo;
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public:
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operator ConvertTo() const { return convertTo<ConvertTo>(); }
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QByteArray toLatin1() const { return convertTo<QString>().toLatin1(); }
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int size() const { return Concatenable::size(*this); }
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const A &a;
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const B &b;
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};
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template <>
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class QStringBuilder <QString, QString>
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{
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public:
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QStringBuilder(const QString &a_, const QString &b_) : a(a_), b(b_) {}
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operator QString() const
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{ QString r(a); r += b; return r; }
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QByteArray toLatin1() const { return QString(*this).toLatin1(); }
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const QString &a;
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const QString &b;
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};
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template <>
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class QStringBuilder <QByteArray, QByteArray>
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{
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public:
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QStringBuilder(const QByteArray &a_, const QByteArray &b_) : a(a_), b(b_) {}
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operator QByteArray() const
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{ QByteArray r(a); r += b; return r; }
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const QByteArray &a;
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const QByteArray &b;
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};
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template <> struct QConcatenable<char> : private QAbstractConcatenable
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{
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typedef char type;
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typedef QByteArray ConvertTo;
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enum { ExactSize = true };
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static int size(const char) { return 1; }
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#ifndef QT_NO_CAST_FROM_ASCII
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static inline QT_ASCII_CAST_WARN void appendTo(const char c, QChar *&out)
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{
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QAbstractConcatenable::convertFromAscii(c, out);
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}
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#endif
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static inline void appendTo(const char c, char *&out)
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{ *out++ = c; }
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};
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template <> struct QConcatenable<QLatin1Char>
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{
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typedef QLatin1Char type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QLatin1Char) { return 1; }
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static inline void appendTo(const QLatin1Char c, QChar *&out)
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{ *out++ = c; }
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static inline void appendTo(const QLatin1Char c, char *&out)
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{ *out++ = c.toLatin1(); }
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};
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template <> struct QConcatenable<QChar> : private QAbstractConcatenable
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{
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typedef QChar type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QChar) { return 1; }
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static inline void appendTo(const QChar c, QChar *&out)
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{ *out++ = c; }
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#ifndef QT_NO_CAST_TO_ASCII
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static inline QT_ASCII_CAST_WARN void appendTo(const QChar c, char *&out)
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{ convertToAscii(c, out); }
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#endif
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};
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template <> struct QConcatenable<QCharRef> : private QAbstractConcatenable
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{
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typedef QCharRef type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QCharRef &) { return 1; }
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static inline void appendTo(const QCharRef &c, QChar *&out)
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{ *out++ = QChar(c); }
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#ifndef QT_NO_CAST_TO_ASCII
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static inline QT_ASCII_CAST_WARN void appendTo(const QCharRef &c, char *&out)
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{ convertToAscii(c, out); }
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#endif
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};
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template <> struct QConcatenable<QLatin1String>
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{
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typedef QLatin1String type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QLatin1String &a) { return qstrlen(a.latin1()); }
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static inline void appendTo(const QLatin1String &a, QChar *&out)
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{
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for (const char *s = a.latin1(); *s; )
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*out++ = QLatin1Char(*s++);
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}
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static inline void appendTo(const QLatin1String &a, char *&out)
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{
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for (const char *s = a.latin1(); *s; )
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*out++ = *s++;
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}
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};
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template <> struct QConcatenable<QLatin1Literal>
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{
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typedef QLatin1Literal type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QLatin1Literal &a) { return a.size(); }
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static inline void appendTo(const QLatin1Literal &a, QChar *&out)
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{
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for (const char *s = a.data(); *s; )
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*out++ = QLatin1Char(*s++);
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}
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static inline void appendTo(const QLatin1Literal &a, char *&out)
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{
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for (const char *s = a.data(); *s; )
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*out++ = *s++;
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}
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};
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template <> struct QConcatenable<QString> : private QAbstractConcatenable
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{
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typedef QString type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QString &a) { return a.size(); }
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static inline void appendTo(const QString &a, QChar *&out)
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{
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const int n = a.size();
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memcpy(out, reinterpret_cast<const char*>(a.constData()), sizeof(QChar) * n);
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out += n;
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}
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#ifndef QT_NO_CAST_TO_ASCII
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static inline QT_ASCII_CAST_WARN void appendTo(const QString &a, char *&out)
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{ convertToAscii(a.constData(), a.length(), out); }
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#endif
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};
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template <> struct QConcatenable<QStringRef> : private QAbstractConcatenable
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{
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typedef QStringRef type;
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typedef QString ConvertTo;
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enum { ExactSize = true };
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static int size(const QStringRef &a) { return a.size(); }
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static inline void appendTo(const QStringRef &a, QChar *&out)
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{
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const int n = a.size();
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memcpy(out, reinterpret_cast<const char*>(a.constData()), sizeof(QChar) * n);
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out += n;
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}
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#ifndef QT_NO_CAST_TO_ASCII
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static inline QT_ASCII_CAST_WARN void appendTo(const QStringRef &a, char *&out)
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{ convertToAscii(a.constData(), a.length(), out); }
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#endif
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};
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template <int N> struct QConcatenable<char[N]> : private QAbstractConcatenable
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{
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typedef char type[N];
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typedef QByteArray ConvertTo;
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enum { ExactSize = false };
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static int size(const char[N]) { return N - 1; }
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#ifndef QT_NO_CAST_FROM_ASCII
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static inline void QT_ASCII_CAST_WARN appendTo(const char a[N], QChar *&out)
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{
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QAbstractConcatenable::convertFromAscii(a, N, out);
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}
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#endif
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static inline void appendTo(const char a[N], char *&out)
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{
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while (*a)
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*out++ = *a++;
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}
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};
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template <int N> struct QConcatenable<const char[N]> : private QAbstractConcatenable
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{
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typedef const char type[N];
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typedef QByteArray ConvertTo;
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enum { ExactSize = false };
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static int size(const char[N]) { return N - 1; }
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#ifndef QT_NO_CAST_FROM_ASCII
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static inline void QT_ASCII_CAST_WARN appendTo(const char a[N], QChar *&out)
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{
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QAbstractConcatenable::convertFromAscii(a, N, out);
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}
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#endif
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static inline void appendTo(const char a[N], char *&out)
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{
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while (*a)
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*out++ = *a++;
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}
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};
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template <> struct QConcatenable<const char *> : private QAbstractConcatenable
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{
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typedef char const *type;
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typedef QByteArray ConvertTo;
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enum { ExactSize = false };
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static int size(const char *a) { return qstrlen(a); }
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#ifndef QT_NO_CAST_FROM_ASCII
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static inline void QT_ASCII_CAST_WARN appendTo(const char *a, QChar *&out)
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{ QAbstractConcatenable::convertFromAscii(a, -1, out); }
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#endif
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static inline void appendTo(const char *a, char *&out)
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{
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if (!a)
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return;
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while (*a)
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*out++ = *a++;
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}
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};
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template <> struct QConcatenable<QByteArray> : private QAbstractConcatenable
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{
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typedef QByteArray type;
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typedef QByteArray ConvertTo;
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enum { ExactSize = false };
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static int size(const QByteArray &ba) { return ba.size(); }
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#ifndef QT_NO_CAST_FROM_ASCII
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static inline void appendTo(const QByteArray &ba, QChar *&out)
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{
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// adding 1 because convertFromAscii expects the size including the null-termination
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QAbstractConcatenable::convertFromAscii(ba.constData(), ba.size() + 1, out);
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}
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#endif
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static inline void appendTo(const QByteArray &ba, char *&out)
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{
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const char *a = ba.constData();
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const char * const end = ba.end();
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while (a != end)
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*out++ = *a++;
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}
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};
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namespace QtStringBuilder {
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template <typename A, typename B> struct ConvertToTypeHelper
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{ typedef A ConvertTo; };
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template <typename T> struct ConvertToTypeHelper<T, QString>
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{ typedef QString ConvertTo; };
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}
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template <typename A, typename B>
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struct QConcatenable< QStringBuilder<A, B> >
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{
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typedef QStringBuilder<A, B> type;
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typedef typename QtStringBuilder::ConvertToTypeHelper<typename QConcatenable<A>::ConvertTo, typename QConcatenable<B>::ConvertTo>::ConvertTo ConvertTo;
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enum { ExactSize = QConcatenable<A>::ExactSize && QConcatenable<B>::ExactSize };
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static int size(const type &p)
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{
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return QConcatenable<A>::size(p.a) + QConcatenable<B>::size(p.b);
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}
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template<typename T> static inline void appendTo(const type &p, T *&out)
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{
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QConcatenable<A>::appendTo(p.a, out);
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QConcatenable<B>::appendTo(p.b, out);
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}
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};
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template <typename A, typename B>
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QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>
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operator%(const A &a, const B &b)
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{
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return QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>(a, b);
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}
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// QT_USE_FAST_OPERATOR_PLUS was introduced in 4.7, QT_USE_QSTRINGBUILDER is to be used from 4.8 onwards
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// QT_USE_FAST_OPERATOR_PLUS does not remove the normal operator+ for QByteArray
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#if defined(QT_USE_FAST_OPERATOR_PLUS) || defined(QT_USE_QSTRINGBUILDER)
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template <typename A, typename B>
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QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>
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operator+(const A &a, const B &b)
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{
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return QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>(a, b);
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}
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#endif
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template <typename A, typename B>
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QByteArray &operator+=(QByteArray &a, const QStringBuilder<A, B> &b)
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{
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#ifndef QT_NO_CAST_TO_ASCII
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if (sizeof(typename QConcatenable< QStringBuilder<A, B> >::ConvertTo::value_type) == sizeof(QChar)) {
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//it is not save to optimize as in utf8 it is not possible to compute the size
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return a += QString(b);
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}
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#endif
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int len = a.size() + QConcatenable< QStringBuilder<A, B> >::size(b);
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a.reserve(len);
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char *it = a.data() + a.size();
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QConcatenable< QStringBuilder<A, B> >::appendTo(b, it);
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a.resize(len); //we need to resize after the appendTo for the case str+=foo+str
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return a;
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}
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template <typename A, typename B>
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QString &operator+=(QString &a, const QStringBuilder<A, B> &b)
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{
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int len = a.size() + QConcatenable< QStringBuilder<A, B> >::size(b);
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a.reserve(len);
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QChar *it = a.data() + a.size();
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QConcatenable< QStringBuilder<A, B> >::appendTo(b, it);
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a.resize(it - a.constData()); //may be smaller than len if there was conversion from utf8
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return a;
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}
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QT_END_NAMESPACE
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QT_END_HEADER
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#endif // QSTRINGBUILDER_H
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