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132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
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// -*- C++ -*-
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/**
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* \file qstring_helpers.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Dekel Tsur
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef QSTRING_HELPERS_H
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#define QSTRING_HELPERS_H
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#include "support/docstring.h"
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#include <QChar>
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#include <QString>
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#include <boost/assert.hpp>
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namespace lyx {
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/**
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* toqstr - convert a UTF8 encoded char * into a QString
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*
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* This should not be used, since all possibly non-ASCII stuff should be
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* stored in a docstring.
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*/
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inline QString const toqstr(char const * str)
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{
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return QString::fromUtf8(str);
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}
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/**
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* toqstr - convert a UTF8 encoded std::string into a QString
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*
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* This should not be used, since all possibly non-ASCII stuff should be
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* stored in a docstring.
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*/
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inline QString const toqstr(std::string const & str)
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{
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return toqstr(str.c_str());
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}
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/**
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* Convert a QChar into a UCS4 character.
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* This is a hack (it does only make sense for the common part of the UCS4
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* and UTF16 encodings) and should not be used.
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* This does only exist because of performance reasons (a real conversion
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* using iconv is too slow on windows).
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*/
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inline char_type const qchar_to_ucs4(QChar const & qchar)
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{
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return static_cast<char_type>(qchar.unicode());
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}
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/**
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* Convert a UCS4 character into a QChar.
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* This is a hack (it does only make sense for the common part of the UCS4
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* and UTF16 encodings) and should not be used.
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* This does only exist because of performance reasons (a real conversion
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* using iconv is too slow on windows).
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*/
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inline QChar const ucs4_to_qchar(char_type const ucs4)
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{
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// FIXME: The following cast is not a real conversion but it work
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// for the ucs2 subrange of unicode. Instead of an assertion we should
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// return some special characters that indicates that its display is
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// not supported.
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BOOST_ASSERT(ucs4 < 65536);
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return QChar(static_cast<unsigned short>(ucs4));
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}
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/**
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* toqstr - convert a UCS4 encoded docstring into a QString
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*
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* This is the preferred method of converting anything that possibly
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* contains non-ASCII stuff to QString.
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*/
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#if QT_VERSION >= 0x040200
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inline QString const toqstr(docstring const & ucs4)
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{
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// If possible we let qt do the work, since this version does not
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// need to be superfast.
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return QString::fromUcs4(reinterpret_cast<uint const *>(ucs4.data()), ucs4.length());
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}
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#else
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QString const toqstr(docstring const & ucs4);
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#endif
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/**
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* ucs4_to_qstring - convert a UCS4 encoded char_type * into a QString
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*
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* This is a hack for the painter and font metrics and should not be used
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* elsewhere. Since it uses ucs4_to_qchar it has the same limitations.
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*/
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inline void ucs4_to_qstring(char_type const * str, size_t ls, QString & s)
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{
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int i = static_cast<int>(ls);
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s.resize(i);
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for (; --i >= 0;)
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s[i] = ucs4_to_qchar(str[i]);
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}
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/**
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* qstring_to_ucs4 - convert a QString into a UCS4 encoded docstring
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*
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* This is the preferred method of converting anything that possibly
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* contains non-ASCII stuff to docstring.
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*/
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docstring const qstring_to_ucs4(QString const & qstr);
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/**
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* fromqstr - convert a QString into a UTF8 encoded std::string
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*
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* This should not be used except for output to lyxerr, since all possibly
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* non-ASCII stuff should be stored in a docstring.
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*/
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std::string const fromqstr(QString const & str);
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} // namespace lyx
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#endif // QSTRING_HELPERS_H
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