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#ifndef COMPONENTS_MISC_STRINGS_CONVERSION_H
#define COMPONENTS_MISC_STRINGS_CONVERSION_H
#include <charconv>
#include <cstdint>
#include <optional>
#include <string>
#include <system_error>
#if !(defined(_MSC_VER) && (_MSC_VER >= 1924)) && !(defined(__GNUC__) && __GNUC__ >= 11) || defined(__clang__) \
|| defined(__apple_build_version__)
#include <ios>
#include <locale>
#include <sstream>
#endif
namespace Misc::StringUtils
{
inline const char* u8StringToString(const char8_t* str)
{
return reinterpret_cast<const char*>(str);
}
inline char* u8StringToString(char8_t* str)
{
return reinterpret_cast<char*>(str);
}
inline std::string u8StringToString(std::u8string_view str)
{
return { str.begin(), str.end() };
}
inline std::string u8StringToString(std::u8string&& str)
{
return { str.begin(), str.end() };
}
inline const char8_t* stringToU8String(const char* str)
{
return reinterpret_cast<const char8_t*>(
str); // Undefined behavior if the contents of "char" aren't UTF8 or ASCII.
}
inline char8_t* stringToU8String(char* str)
{
return reinterpret_cast<char8_t*>(str); // Undefined behavior if the contents of "char" aren't UTF8 or ASCII.
}
inline std::u8string stringToU8String(std::string_view str)
{
return { str.begin(), str.end() }; // Undefined behavior if the contents of "char" aren't UTF8 or ASCII.
}
inline std::u8string stringToU8String(std::string&& str)
{
return { str.begin(), str.end() }; // Undefined behavior if the contents of "char" aren't UTF8 or ASCII.
}
template <typename T>
inline std::optional<T> toNumeric(std::string_view s)
{
T result{};
auto [ptr, ec]{ std::from_chars(s.data(), s.data() + s.size(), result) };
if (ec == std::errc())
{
return result;
}
return std::nullopt;
}
template <typename T>
inline T toNumeric(std::string_view s, T defaultValue)
{
if (auto numeric = toNumeric<T>(s))
{
return *numeric;
}
return defaultValue;
}
// support for std::from_chars as of 2023-02-27
// - Visual Studio 2019 version 16.4 (1924)
// - GCC 11
// - Clang does not support floating points yet
// - Apples Clang does not support floating points yet
#if !(defined(_MSC_VER) && (_MSC_VER >= 1924)) && !(defined(__GNUC__) && __GNUC__ >= 11) || defined(__clang__) \
|| defined(__apple_build_version__)
template <>
inline std::optional<float> toNumeric<float>(std::string_view s)
{
if (!s.empty())
{
std::istringstream iss(s.data());
iss.imbue(std::locale::classic());
float value;
if (iss >> value)
{
return value;
}
}
return std::nullopt;
}
template <>
inline std::optional<double> toNumeric<double>(std::string_view s)
{
if (!s.empty())
{
std::istringstream iss(s.data());
iss.imbue(std::locale::classic());
double value;
if (iss >> value)
{
return value;
}
}
return std::nullopt;
}
#endif
inline std::string toHex(std::string_view value)
{
std::string buffer(value.size() * 2, '0');
char* out = buffer.data();
for (const char v : value)
{
const std::ptrdiff_t space = static_cast<std::ptrdiff_t>(static_cast<std::uint8_t>(v) <= 0xf);
const auto [ptr, ec] = std::to_chars(out + space, out + space + 2, static_cast<std::uint8_t>(v), 16);
if (ec != std::errc())
throw std::system_error(std::make_error_code(ec));
out += 2;
}
return buffer;
}
}
#endif // COMPONENTS_MISC_STRINGS_CONVERSION_H
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