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****************************************************************************/

#ifndef QSTRINGBUILDER_H

#define QSTRINGBUILDER_H

#include <QtCore/qstring.h>

#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL)

#  if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ == 0)

#    include <QtCore/qmap.h>

#  endif

#endif

#include <string.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

// ### Qt 5: merge with QLatin1String

class QLatin1Literal

{

public:

    int size() const { return m_size; }

    const char *data() const { return m_data; }

    template <int N>

    QLatin1Literal(const char (&str)[N])

        : m_size(N - 1), m_data(str) {}

private:

    const int m_size;

};

struct Q_CORE_EXPORT QAbstractConcatenable

{

protected:

    static void convertFromAscii(const char *a, int len, QChar *&out);

    static inline void convertFromAscii(char a, QChar *&out)

    {

#ifndef QT_NO_TEXTCODEC

        if (QString::codecForCStrings)

            *out++ = QChar::fromAscii(a);

        else

#endif

            *out++ = QLatin1Char(a);

    }

};

template <typename T> struct QConcatenable {};

template <typename A, typename B>

class QStringBuilder

{

public:

    QStringBuilder(const A &a_, const B &b_) : a(a_), b(b_) {}

    operator QString() const

    {

        QString s(QConcatenable< QStringBuilder<A, B> >::size(*this),

            Qt::Uninitialized);

        QChar *d = s.data();

        QConcatenable< QStringBuilder<A, B> >::appendTo(*this, d);

        // this resize is necessary since we allocate a bit too much

        // when dealing with variable sized 8-bit encodings

        s.resize(d - s.data());

        return s;

    }

    QByteArray toLatin1() const { return QString(*this).toLatin1(); }

    const A &a;

    const B &b;

};

template <> struct QConcatenable<char> : private QAbstractConcatenable

{

    typedef char type;

    static int size(const char) { return 1; }

    static inline void appendTo(const char c, QChar *&out)

    {

        QAbstractConcatenable::convertFromAscii(c, out);

    }

};

template <> struct QConcatenable<QLatin1Char>

{

    typedef QLatin1Char type;

    static int size(const QLatin1Char) { return 1; }

    static inline void appendTo(const QLatin1Char c, QChar *&out)

    {

        *out++ = c;

    }

};

template <> struct QConcatenable<QChar>

{

    typedef QChar type;

    static int size(const QChar) { return 1; }

    static inline void appendTo(const QChar c, QChar *&out)

    {

        *out++ = c;

    }

};

template <> struct QConcatenable<QCharRef>

{

    typedef QCharRef type;

    static int size(const QCharRef &) { return 1; }

    static inline void appendTo(const QCharRef &c, QChar *&out)

    {

        *out++ = QChar(c);

    }

};

template <> struct QConcatenable<QLatin1String>

{

    typedef QLatin1String type;

    static int size(const QLatin1String &a) { return qstrlen(a.latin1()); }

    static inline void appendTo(const QLatin1String &a, QChar *&out)

    {

        for (const char *s = a.latin1(); *s; )

            *out++ = QLatin1Char(*s++);

    }

};

template <> struct QConcatenable<QLatin1Literal>

{

    typedef QLatin1Literal type;

    static int size(const QLatin1Literal &a) { return a.size(); }

    static inline void appendTo(const QLatin1Literal &a, QChar *&out)

    {

        for (const char *s = a.data(); *s; )

            *out++ = QLatin1Char(*s++);

    }

};

template <> struct QConcatenable<QString>

{

    typedef QString type;

    static int size(const QString &a) { return a.size(); }

    static inline void appendTo(const QString &a, QChar *&out)

    {

        const int n = a.size();

        memcpy(out, reinterpret_cast<const char*>(a.constData()), sizeof(QChar) * n);

        out += n;

    }

};

template <> struct QConcatenable<QStringRef>

{

    typedef QStringRef type;

    static int size(const QStringRef &a) { return a.size(); }

    static inline void appendTo(QStringRef a, QChar *&out)

    {

        const int n = a.size();

        memcpy(out, reinterpret_cast<const char*>(a.constData()), sizeof(QChar) * n);

        out += n;

    }

};

#ifndef QT_NO_CAST_FROM_ASCII

template <int N> struct QConcatenable<char[N]> : private QAbstractConcatenable

{

    typedef char type[N];

    static int size(const char[N])

    {

        return N - 1;

    }

    static inline void appendTo(const char a[N], QChar *&out)

    {

        QAbstractConcatenable::convertFromAscii(a, N, out);

    }

};

template <int N> struct QConcatenable<const char[N]> : private QAbstractConcatenable

{

    typedef const char type[N];

    static int size(const char[N]) { return N - 1; }

    static inline void appendTo(const char a[N], QChar *&out)

    {

        QAbstractConcatenable::convertFromAscii(a, N, out);

    }

};

template <> struct QConcatenable<const char *> : private QAbstractConcatenable

{

    typedef char const *type;

    static int size(const char *a) { return qstrlen(a); }

    static inline void appendTo(const char *a, QChar *&out)

    {

        QAbstractConcatenable::convertFromAscii(a, -1, out);

    }

};

template <> struct QConcatenable<QByteArray> : private QAbstractConcatenable

{

    typedef QByteArray type;

    static int size(const QByteArray &ba) { return qstrnlen(ba.constData(), ba.size()); }

    static inline void appendTo(const QByteArray &ba, QChar *&out)

    {

        QAbstractConcatenable::convertFromAscii(ba.constData(), -1, out);

    }

};

#endif

template <typename A, typename B>

struct QConcatenable< QStringBuilder<A, B> >

{

    typedef QStringBuilder<A, B> type;

    static int size(const type &p)

    {

        return QConcatenable<A>::size(p.a) + QConcatenable<B>::size(p.b);

    }

    static inline void appendTo(const QStringBuilder<A, B> &p, QChar *&out)

    {

        QConcatenable<A>::appendTo(p.a, out);

        QConcatenable<B>::appendTo(p.b, out);

    }

};

template <typename A, typename B>

QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>

operator%(const A &a, const B &b)

{

   return QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>(a, b);

}

#ifdef QT_USE_FAST_OPERATOR_PLUS

template <typename A, typename B>

QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>

operator+(const A &a, const B &b)

{

   return QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>(a, b);

}

#endif

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSTRINGBUILDER_H