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Diffstat (limited to 'src/corelib/tools/qstringbuilder.h')
| -rw-r--r-- | src/corelib/tools/qstringbuilder.h | 455 |
1 files changed, 455 insertions, 0 deletions
diff --git a/src/corelib/tools/qstringbuilder.h b/src/corelib/tools/qstringbuilder.h new file mode 100644 index 0000000000..2d3475fed9 --- /dev/null +++ b/src/corelib/tools/qstringbuilder.h @@ -0,0 +1,455 @@ +/**************************************************************************** +** +** 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. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QSTRINGBUILDER_H +#define QSTRINGBUILDER_H + +#include <QtCore/qstring.h> +#include <QtCore/qbytearray.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; + const char * const m_data; +}; + +struct Q_CORE_EXPORT QAbstractConcatenable +{ +protected: + static void convertFromAscii(const char *a, int len, QChar *&out); + static void convertToAscii(const QChar *a, int len, char *&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); + } + + static inline void convertToAscii(QChar a, char *&out) + { +#ifndef QT_NO_TEXTCODEC + if (QString::codecForCStrings) + *out++ = a.toAscii(); //### + else +#endif + convertToLatin1(a, out); + } + + static inline void convertToLatin1(QChar a, char *&out) + { + *out++ = a.unicode() > 0xff ? '?' : char(a.unicode()); + } +}; + +template <typename T> struct QConcatenable {}; + +template <typename A, typename B> +class QStringBuilder +{ +public: + QStringBuilder(const A &a_, const B &b_) : a(a_), b(b_) {} +private: + friend class QByteArray; + friend class QString; + template <typename T> T convertTo() const + { + const uint len = QConcatenable< QStringBuilder<A, B> >::size(*this); + T s(len, Qt::Uninitialized); + + typename T::iterator d = s.data(); + typename T::const_iterator const start = d; + QConcatenable< QStringBuilder<A, B> >::appendTo(*this, d); + + if (!QConcatenable< QStringBuilder<A, B> >::ExactSize && int(len) != d - start) { + // this resize is necessary since we allocate a bit too much + // when dealing with variable sized 8-bit encodings + s.resize(d - start); + } + return s; + } + + typedef QConcatenable<QStringBuilder<A, B> > Concatenable; + typedef typename Concatenable::ConvertTo ConvertTo; +public: + operator ConvertTo() const { return convertTo<ConvertTo>(); } + + QByteArray toLatin1() const { return convertTo<QString>().toLatin1(); } + int size() const { return Concatenable::size(*this); } + + const A &a; + const B &b; +}; + +template <> +class QStringBuilder <QString, QString> +{ + public: + QStringBuilder(const QString &a_, const QString &b_) : a(a_), b(b_) {} + + operator QString() const + { QString r(a); r += b; return r; } + QByteArray toLatin1() const { return QString(*this).toLatin1(); } + + const QString &a; + const QString &b; +}; + +template <> +class QStringBuilder <QByteArray, QByteArray> +{ + public: + QStringBuilder(const QByteArray &a_, const QByteArray &b_) : a(a_), b(b_) {} + + operator QByteArray() const + { QByteArray r(a); r += b; return r; } + + const QByteArray &a; + const QByteArray &b; +}; + + +template <> struct QConcatenable<char> : private QAbstractConcatenable +{ + typedef char type; + typedef QByteArray ConvertTo; + enum { ExactSize = true }; + static int size(const char) { return 1; } +#ifndef QT_NO_CAST_FROM_ASCII + static inline QT_ASCII_CAST_WARN void appendTo(const char c, QChar *&out) + { + QAbstractConcatenable::convertFromAscii(c, out); + } +#endif + static inline void appendTo(const char c, char *&out) + { *out++ = c; } +}; + +template <> struct QConcatenable<QLatin1Char> +{ + typedef QLatin1Char type; + typedef QString ConvertTo; + enum { ExactSize = true }; + static int size(const QLatin1Char) { return 1; } + static inline void appendTo(const QLatin1Char c, QChar *&out) + { *out++ = c; } + static inline void appendTo(const QLatin1Char c, char *&out) + { *out++ = c.toLatin1(); } +}; + +template <> struct QConcatenable<QChar> : private QAbstractConcatenable +{ + typedef QChar type; + typedef QString ConvertTo; + enum { ExactSize = true }; + static int size(const QChar) { return 1; } + static inline void appendTo(const QChar c, QChar *&out) + { *out++ = c; } +#ifndef QT_NO_CAST_TO_ASCII + static inline QT_ASCII_CAST_WARN void appendTo(const QChar c, char *&out) + { convertToAscii(c, out); } +#endif +}; + +template <> struct QConcatenable<QCharRef> : private QAbstractConcatenable +{ + typedef QCharRef type; + typedef QString ConvertTo; + enum { ExactSize = true }; + static int size(const QCharRef &) { return 1; } + static inline void appendTo(const QCharRef &c, QChar *&out) + { *out++ = QChar(c); } +#ifndef QT_NO_CAST_TO_ASCII + static inline QT_ASCII_CAST_WARN void appendTo(const QCharRef &c, char *&out) + { convertToAscii(c, out); } +#endif +}; + +template <> struct QConcatenable<QLatin1String> +{ + typedef QLatin1String type; + typedef QString ConvertTo; + enum { ExactSize = true }; + 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++); + } + static inline void appendTo(const QLatin1String &a, char *&out) + { + for (const char *s = a.latin1(); *s; ) + *out++ = *s++; + } +}; + +template <> struct QConcatenable<QLatin1Literal> +{ + typedef QLatin1Literal type; + typedef QString ConvertTo; + enum { ExactSize = true }; + 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++); + } + static inline void appendTo(const QLatin1Literal &a, char *&out) + { + for (const char *s = a.data(); *s; ) + *out++ = *s++; + } +}; + +template <> struct QConcatenable<QString> : private QAbstractConcatenable +{ + typedef QString type; + typedef QString ConvertTo; + enum { ExactSize = true }; + 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; + } +#ifndef QT_NO_CAST_TO_ASCII + static inline QT_ASCII_CAST_WARN void appendTo(const QString &a, char *&out) + { convertToAscii(a.constData(), a.length(), out); } +#endif +}; + +template <> struct QConcatenable<QStringRef> : private QAbstractConcatenable +{ + typedef QStringRef type; + typedef QString ConvertTo; + enum { ExactSize = true }; + static int size(const QStringRef &a) { return a.size(); } + static inline void appendTo(const 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_TO_ASCII + static inline QT_ASCII_CAST_WARN void appendTo(const QStringRef &a, char *&out) + { convertToAscii(a.constData(), a.length(), out); } +#endif + +}; + +template <int N> struct QConcatenable<char[N]> : private QAbstractConcatenable +{ + typedef char type[N]; + typedef QByteArray ConvertTo; + enum { ExactSize = false }; + static int size(const char[N]) { return N - 1; } +#ifndef QT_NO_CAST_FROM_ASCII + static inline void QT_ASCII_CAST_WARN appendTo(const char a[N], QChar *&out) + { + QAbstractConcatenable::convertFromAscii(a, N, out); + } +#endif + static inline void appendTo(const char a[N], char *&out) + { + while (*a) + *out++ = *a++; + } +}; + +template <int N> struct QConcatenable<const char[N]> : private QAbstractConcatenable +{ + typedef const char type[N]; + typedef QByteArray ConvertTo; + enum { ExactSize = false }; + static int size(const char[N]) { return N - 1; } +#ifndef QT_NO_CAST_FROM_ASCII + static inline void QT_ASCII_CAST_WARN appendTo(const char a[N], QChar *&out) + { + QAbstractConcatenable::convertFromAscii(a, N, out); + } +#endif + static inline void appendTo(const char a[N], char *&out) + { + while (*a) + *out++ = *a++; + } +}; + +template <> struct QConcatenable<const char *> : private QAbstractConcatenable +{ + typedef char const *type; + typedef QByteArray ConvertTo; + enum { ExactSize = false }; + static int size(const char *a) { return qstrlen(a); } +#ifndef QT_NO_CAST_FROM_ASCII + static inline void QT_ASCII_CAST_WARN appendTo(const char *a, QChar *&out) + { QAbstractConcatenable::convertFromAscii(a, -1, out); } +#endif + static inline void appendTo(const char *a, char *&out) + { + while (*a) + *out++ = *a++; + } +}; + +template <> struct QConcatenable<QByteArray> : private QAbstractConcatenable +{ + typedef QByteArray type; + typedef QByteArray ConvertTo; + enum { ExactSize = false }; + static int size(const QByteArray &ba) { return ba.size(); } +#ifndef QT_NO_CAST_FROM_ASCII + static inline void appendTo(const QByteArray &ba, QChar *&out) + { + // adding 1 because convertFromAscii expects the size including the null-termination + QAbstractConcatenable::convertFromAscii(ba.constData(), ba.size() + 1, out); + } +#endif + static inline void appendTo(const QByteArray &ba, char *&out) + { + const char *a = ba.constData(); + const char * const end = ba.end(); + while (a != end) + *out++ = *a++; + } +}; + +namespace QtStringBuilder { + template <typename A, typename B> struct ConvertToTypeHelper + { typedef A ConvertTo; }; + template <typename T> struct ConvertToTypeHelper<T, QString> + { typedef QString ConvertTo; }; +} + +template <typename A, typename B> +struct QConcatenable< QStringBuilder<A, B> > +{ + typedef QStringBuilder<A, B> type; + typedef typename QtStringBuilder::ConvertToTypeHelper<typename QConcatenable<A>::ConvertTo, typename QConcatenable<B>::ConvertTo>::ConvertTo ConvertTo; + enum { ExactSize = QConcatenable<A>::ExactSize && QConcatenable<B>::ExactSize }; + static int size(const type &p) + { + return QConcatenable<A>::size(p.a) + QConcatenable<B>::size(p.b); + } + template<typename T> static inline void appendTo(const type &p, T *&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 + +template <typename A, typename B> +QByteArray &operator+=(QByteArray &a, const QStringBuilder<A, B> &b) +{ +#ifndef QT_NO_CAST_TO_ASCII + if (sizeof(typename QConcatenable< QStringBuilder<A, B> >::ConvertTo::value_type) == sizeof(QChar)) { + //it is not save to optimize as in utf8 it is not possible to compute the size + return a += QString(b); + } +#endif + int len = a.size() + QConcatenable< QStringBuilder<A, B> >::size(b); + a.reserve(len); + char *it = a.data() + a.size(); + QConcatenable< QStringBuilder<A, B> >::appendTo(b, it); + a.resize(len); //we need to resize after the appendTo for the case str+=foo+str + return a; +} + +template <typename A, typename B> +QString &operator+=(QString &a, const QStringBuilder<A, B> &b) +{ + int len = a.size() + QConcatenable< QStringBuilder<A, B> >::size(b); + a.reserve(len); + QChar *it = a.data() + a.size(); + QConcatenable< QStringBuilder<A, B> >::appendTo(b, it); + a.resize(it - a.constData()); //may be smaller than len if there was conversion from utf8 + return a; +} + + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif // QSTRINGBUILDER_H |