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livetrax/libs/pbd/pbd/string_convert.h
Tim Mayberry c634daef6a Add locale independent and thread safe string conversion API with tests 
All conversions are performed as if in the "C" locale but without actually
changing locale.

This is a wrapper around printf/sscanf for int types which aren't affected by
locale and uses glib functions g_ascii_strtod and g_ascii_dtostr for
float/double types.

My first attempt at this used std::stringstream and
ios::imbue(std::locale::classic()) as it should be thread safe, but testing
shows it is not for gcc/mingw-w64 on Windows, and possibly also some versions
of macOS/OS X.

Use "yes" and "no" when converting a boolean in PBD::string_to<bool> as this
seems to be the convention used throughout libardour which will allow using
string_to<bool> in those cases.

Add accepted bool string values from PBD::string_is_affirmative to
PBD::string_to<bool>

Mark strings in pbd/string_convert.cc as not for translation

Add u/int16_t string conversions to pbd/string_convert.h and tests

Add DEBUG_TRACE output on conversion errors

Add int8_t/uint8_t conversions(using int16/uint16 types) to string_convert.h

Add support for converting an infinity expression to/from string

Follows the C99/C11 standard for strtof/strtod where subject sequence is an
optional plus or minus sign then INF or INFINITY, ignoring case.
2017-04-16 14:02:41 +10:00

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/*
Copyright (C) 2015 Tim Mayberry
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef PBD_STRING_CONVERT_H
#define PBD_STRING_CONVERT_H
#include <string>
#include <stdint.h>
#include "pbd/libpbd_visibility.h"
/**
* Locale independent and thread-safe string conversion utility functions.
*
* All conversions are done as if they were performed in the C locale without
* actually changing the current locale.
*/
namespace PBD {
LIBPBD_API bool bool_to_string (bool val, std::string& str);
LIBPBD_API bool int16_to_string (int16_t val, std::string& str);
LIBPBD_API bool uint16_to_string (uint16_t val, std::string& str);
LIBPBD_API bool int32_to_string (int32_t val, std::string& str);
LIBPBD_API bool uint32_to_string (uint32_t val, std::string& str);
LIBPBD_API bool int64_to_string (int64_t val, std::string& str);
LIBPBD_API bool uint64_to_string (uint64_t val, std::string& str);
LIBPBD_API bool float_to_string (float val, std::string& str);
LIBPBD_API bool double_to_string (double val, std::string& str);
LIBPBD_API bool string_to_bool (const std::string& str, bool& val);
LIBPBD_API bool string_to_int16 (const std::string& str, int16_t& val);
LIBPBD_API bool string_to_uint16 (const std::string& str, uint16_t& val);
LIBPBD_API bool string_to_int32 (const std::string& str, int32_t& val);
LIBPBD_API bool string_to_uint32 (const std::string& str, uint32_t& val);
LIBPBD_API bool string_to_int64 (const std::string& str, int64_t& val);
LIBPBD_API bool string_to_uint64 (const std::string& str, uint64_t& val);
LIBPBD_API bool string_to_float (const std::string& str, float& val);
LIBPBD_API bool string_to_double (const std::string& str, double& val);
template <class T>
inline bool to_string (T val, std::string& str)
{
// This will cause a compile time error if this function is ever
// instantiated, which is useful to catch unintended conversions
typename T::TO_STRING_TEMPLATE_NOT_DEFINED_FOR_THIS_TYPE invalid_type;
return false;
}
template <class T>
inline bool to_string (bool val, std::string& str)
{
return bool_to_string (val, str);
}
template <class T>
inline bool to_string (int8_t val, std::string& str)
{
return int16_to_string (val, str);
}
template <class T>
inline bool to_string (uint8_t val, std::string& str)
{
return uint16_to_string (val, str);
}
template <class T>
inline bool to_string (int16_t val, std::string& str)
{
return int16_to_string (val, str);
}
template <class T>
inline bool to_string (uint16_t val, std::string& str)
{
return uint16_to_string (val, str);
}
template <class T>
inline bool to_string (int32_t val, std::string& str)
{
return int32_to_string (val, str);
}
template <class T>
inline bool to_string (uint32_t val, std::string& str)
{
return uint32_to_string (val, str);
}
template <class T>
inline bool to_string (int64_t val, std::string& str)
{
return int64_to_string (val, str);
}
template <class T>
inline bool to_string (uint64_t val, std::string& str)
{
return uint64_to_string (val, str);
}
template <class T>
inline bool to_string (float val, std::string& str)
{
return float_to_string (val, str);
}
template <class T>
inline bool to_string (double val, std::string& str)
{
return double_to_string (val, str);
}
template <class T>
inline bool string_to (const std::string& str, T& val)
{
// This will cause a compile time error if this function is ever
// instantiated, which is useful to catch unintended conversions
typename T::TO_STRING_TEMPLATE_NOT_DEFINED_FOR_THIS_TYPE invalid_type;
return false;
}
template <class T>
inline bool string_to (const std::string& str, bool& val)
{
return string_to_bool (str, val);
}
template <class T>
inline bool string_to (const std::string& str, int8_t& val)
{
int16_t tmp = val;
bool success = string_to_int16 (str, tmp);
if (!success) return false;
val = tmp;
return true;
}
template <class T>
inline bool string_to (const std::string& str, uint8_t& val)
{
uint16_t tmp = val;
bool success = string_to_uint16 (str, tmp);
if (!success) return false;
val = tmp;
return true;
}
template <class T>
inline bool string_to (const std::string& str, int16_t& val)
{
return string_to_int16 (str, val);
}
template <class T>
inline bool string_to (const std::string& str, uint16_t& val)
{
return string_to_uint16 (str, val);
}
template <class T>
inline bool string_to (const std::string& str, int32_t& val)
{
return string_to_int32 (str, val);
}
template <class T>
inline bool string_to (const std::string& str, uint32_t& val)
{
return string_to_uint32 (str, val);
}
template <class T>
inline bool string_to (const std::string& str, int64_t& val)
{
return string_to_int64 (str, val);
}
template <class T>
inline bool string_to (const std::string& str, uint64_t& val)
{
return string_to_uint64 (str, val);
}
template <class T>
inline bool string_to (const std::string& str, float& val)
{
return string_to_float (str, val);
}
template <class T>
inline bool string_to (const std::string& str, double& val)
{
return string_to_double (str, val);
}
////////////////////////////////////////////////////////////////
// Variation that disregards conversion errors
////////////////////////////////////////////////////////////////
template <class T>
inline std::string to_string (T val)
{
// This will cause a compile time error if this function is ever
// instantiated, which is useful to catch unintended conversions
typename T::TO_STRING_TEMPLATE_NOT_DEFINED_FOR_THIS_TYPE invalid_type;
return std::string();
}
template <>
inline std::string to_string (bool val)
{
std::string tmp;
bool_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (int8_t val)
{
std::string tmp;
int16_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (uint8_t val)
{
std::string tmp;
uint16_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (int16_t val)
{
std::string tmp;
int16_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (uint16_t val)
{
std::string tmp;
uint16_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (int32_t val)
{
std::string tmp;
int32_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (uint32_t val)
{
std::string tmp;
uint32_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (int64_t val)
{
std::string tmp;
int64_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (uint64_t val)
{
std::string tmp;
uint64_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (float val)
{
std::string tmp;
float_to_string (val, tmp);
return tmp;
}
template <>
inline std::string to_string (double val)
{
std::string tmp;
double_to_string (val, tmp);
return tmp;
}
template <class T>
inline T string_to (const std::string& str)
{
// This will cause a compile time error if this function is ever
// instantiated, which is useful to catch unintended conversions
typename T::STRING_TO_TEMPLATE_NOT_DEFINED_FOR_THIS_TYPE invalid_type;
return T();
}
template <>
inline bool string_to (const std::string& str)
{
bool tmp;
string_to_bool (str, tmp);
return tmp;
}
template <>
inline int8_t string_to (const std::string& str)
{
int16_t tmp;
string_to_int16 (str, tmp);
return tmp;
}
template <>
inline uint8_t string_to (const std::string& str)
{
uint16_t tmp;
string_to_uint16 (str, tmp);
return tmp;
}
template <>
inline int16_t string_to (const std::string& str)
{
int16_t tmp;
string_to_int16 (str, tmp);
return tmp;
}
template <>
inline uint16_t string_to (const std::string& str)
{
uint16_t tmp;
string_to_uint16 (str, tmp);
return tmp;
}
template <>
inline int32_t string_to (const std::string& str)
{
int32_t tmp;
string_to_int32 (str, tmp);
return tmp;
}
template <>
inline uint32_t string_to (const std::string& str)
{
uint32_t tmp;
string_to_uint32 (str, tmp);
return tmp;
}
template <>
inline int64_t string_to (const std::string& str)
{
int64_t tmp;
string_to_int64 (str, tmp);
return tmp;
}
template <>
inline uint64_t string_to (const std::string& str)
{
uint64_t tmp;
string_to_uint64 (str, tmp);
return tmp;
}
template <>
inline float string_to (const std::string& str)
{
float tmp;
string_to_float (str, tmp);
return tmp;
}
template <>
inline double string_to (const std::string& str)
{
double tmp;
string_to_double (str, tmp);
return tmp;
}
} // namespace PBD
#endif // PBD_STRING_CONVERT_H
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