157 lines
4.6 KiB
C++
157 lines
4.6 KiB
C++
/**
|
|
* @file stringize.h
|
|
* @author Nat Goodspeed
|
|
* @date 2008-12-17
|
|
* @brief stringize(item) template function and STRINGIZE(expression) macro
|
|
*
|
|
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
|
|
* Second Life Viewer Source Code
|
|
* Copyright (C) 2010, Linden Research, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation;
|
|
* version 2.1 of the License only.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
|
|
* $/LicenseInfo$
|
|
*/
|
|
|
|
#if ! defined(LL_STRINGIZE_H)
|
|
#define LL_STRINGIZE_H
|
|
|
|
#include <sstream>
|
|
#include <llstring.h>
|
|
|
|
/**
|
|
* gstringize(item) encapsulates an idiom we use constantly, using
|
|
* operator<<(std::ostringstream&, TYPE) followed by std::ostringstream::str()
|
|
* or their wstring equivalents
|
|
* to render a string expressing some item.
|
|
*/
|
|
template <typename CHARTYPE, typename T>
|
|
std::basic_string<CHARTYPE> gstringize(const T& item)
|
|
{
|
|
std::basic_ostringstream<CHARTYPE> out;
|
|
out << item;
|
|
return out.str();
|
|
}
|
|
|
|
/**
|
|
*partial specialization of stringize for handling wstring
|
|
*TODO: we should have similar specializations for wchar_t[] but not until it is needed.
|
|
*/
|
|
inline std::string stringize(const std::wstring& item)
|
|
{
|
|
return wstring_to_utf8str(item);
|
|
}
|
|
|
|
/**
|
|
* Specialization of gstringize for std::string return types
|
|
*/
|
|
template <typename T>
|
|
std::string stringize(const T& item)
|
|
{
|
|
return gstringize<char>(item);
|
|
}
|
|
|
|
/**
|
|
* Specialization for generating wstring from string.
|
|
* Both a convenience function and saves a miniscule amount of overhead.
|
|
*/
|
|
inline std::wstring wstringize(const std::string& item)
|
|
{
|
|
// utf8str_to_wstring() returns LLWString, which isn't necessarily the
|
|
// same as std::wstring
|
|
LLWString s(utf8str_to_wstring(item));
|
|
return std::wstring(s.begin(), s.end());
|
|
}
|
|
|
|
/**
|
|
* Specialization of gstringize for std::wstring return types
|
|
*/
|
|
template <typename T>
|
|
std::wstring wstringize(const T& item)
|
|
{
|
|
return gstringize<wchar_t>(item);
|
|
}
|
|
|
|
/**
|
|
* stringize_f(functor)
|
|
*/
|
|
template <typename CHARTYPE, typename Functor>
|
|
std::basic_string<CHARTYPE> stringize_f(Functor const & f)
|
|
{
|
|
std::basic_ostringstream<CHARTYPE> out;
|
|
f(out);
|
|
return out.str();
|
|
}
|
|
|
|
/**
|
|
* STRINGIZE(item1 << item2 << item3 ...) effectively expands to the
|
|
* following:
|
|
* @code
|
|
* std::ostringstream out;
|
|
* out << item1 << item2 << item3 ... ;
|
|
* return out.str();
|
|
* @endcode
|
|
*/
|
|
#define STRINGIZE(EXPRESSION) (stringize_f<char>([&](std::ostream& out){ out << EXPRESSION; }))
|
|
|
|
/**
|
|
* WSTRINGIZE() is the wstring equivalent of STRINGIZE()
|
|
*/
|
|
#define WSTRINGIZE(EXPRESSION) (stringize_f<wchar_t>([&](std::wostream& out){ out << EXPRESSION; }))
|
|
|
|
/**
|
|
* destringize(str)
|
|
* defined for symmetry with stringize
|
|
* @NOTE - this has distinct behavior from boost::lexical_cast<T> regarding
|
|
* leading/trailing whitespace and handling of bad_lexical_cast exceptions
|
|
* @NOTE - no need for dewstringize(), since passing std::wstring will Do The
|
|
* Right Thing
|
|
*/
|
|
template <typename T, typename CHARTYPE>
|
|
T destringize(std::basic_string<CHARTYPE> const & str)
|
|
{
|
|
T val;
|
|
std::basic_istringstream<CHARTYPE> in(str);
|
|
in >> val;
|
|
return val;
|
|
}
|
|
|
|
/**
|
|
* destringize_f(str, functor)
|
|
*/
|
|
template <typename CHARTYPE, typename Functor>
|
|
void destringize_f(std::basic_string<CHARTYPE> const & str, Functor const & f)
|
|
{
|
|
std::basic_istringstream<CHARTYPE> in(str);
|
|
f(in);
|
|
}
|
|
|
|
/**
|
|
* DESTRINGIZE(str, item1 >> item2 >> item3 ...) effectively expands to the
|
|
* following:
|
|
* @code
|
|
* std::istringstream in(str);
|
|
* in >> item1 >> item2 >> item3 ... ;
|
|
* @endcode
|
|
* @NOTE - once we get generic lambdas, we shouldn't need DEWSTRINGIZE() any
|
|
* more since DESTRINGIZE() should do the right thing with a std::wstring. But
|
|
* until then, the lambda we pass must accept the right std::basic_istream.
|
|
*/
|
|
#define DESTRINGIZE(STR, EXPRESSION) (destringize_f((STR), [&](std::istream& in){in >> EXPRESSION;}))
|
|
#define DEWSTRINGIZE(STR, EXPRESSION) (destringize_f((STR), [&](std::wistream& in){in >> EXPRESSION;}))
|
|
|
|
#endif /* ! defined(LL_STRINGIZE_H) */
|