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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef TRINITY_STRINGCONVERT_H
#define TRINITY_STRINGCONVERT_H
#include "Define.h"
#include "Errors.h"
#include "Optional.h"
#include "Types.h"
#include "Util.h"
#include <charconv>
#include <string>
#include <string_view>
#include <type_traits>
namespace Trinity::Impl::StringConvertImpl
{
template <typename T, typename = void> struct For
{
static_assert(Trinity::dependant_false_v<T>, "Unsupported type used for ToString or StringTo");
/*
static Optional<T> FromString(std::string_view str, ...);
static std::string ToString(T&& val, ...);
*/
};
// @todo relax this once proper std::from_chars support exists
template <typename T>
struct For<T, std::enable_if_t<std::is_integral_v<T> && !std::is_same_v<T, bool>>>
{
static Optional<T> FromString(std::string_view str, int base = 10)
{
if (base == 0)
{
if (StringEqualI(str.substr(0, 2), "0x"))
{
base = 16;
str.remove_prefix(2);
}
else if (StringEqualI(str.substr(0, 2), "0b"))
{
base = 2;
str.remove_prefix(2);
}
else
base = 10;
if (str.empty())
return std::nullopt;
}
char const* const start = str.data();
char const* const end = (start + str.length());
T val;
std::from_chars_result const res = std::from_chars(start, end, val, base);
if (res.ptr == end)
return val;
else
return std::nullopt;
}
static std::string ToString(T val)
{
std::string buf(20,'\0'); /* 2^64 is 20 decimal characters, -(2^63) is 20 including the sign */
char* const start = buf.data();
char* const end = (start + buf.length());
std::to_chars_result const res = std::to_chars(start, end, val);
ASSERT(res.ec == std::errc());
buf.resize(res.ptr - start);
return buf;
}
};
#ifdef TRINITY_NEED_CHARCONV_WORKAROUND
/*
If this is defined, std::from_chars will cause linkage errors for 64-bit types.
(This is a bug in clang-7.)
If the clang requirement is bumped to >= clang-8, remove this ifdef block and its
associated check in cmake/compiler/clang/settings.cmake
*/
template <>
struct For<uint64, void>
{
static Optional<uint64> FromString(std::string_view str, int base = 10)
{
if (str.empty())
return std::nullopt;
try
{
size_t n;
uint64 val = std::stoull(std::string(str), &n, base);
if (n != str.length())
return std::nullopt;
return val;
}
catch (...) { return std::nullopt; }
}
static std::string ToString(uint64 val)
{
return std::to_string(val);
}
};
template <>
struct For<int64, void>
{
static Optional<int64> FromString(std::string_view str, int base = 10)
{
try {
if (str.empty())
return std::nullopt;
size_t n;
int64 val = std::stoll(std::string(str), &n, base);
if (n != str.length())
return std::nullopt;
return val;
}
catch (...) { return std::nullopt; }
}
static std::string ToString(int64 val)
{
return std::to_string(val);
}
};
#endif
template <>
struct For<bool, void>
{
static Optional<bool> FromString(std::string_view str)
{
if ((str == "1") || StringEqualI(str, "y") || StringEqualI(str, "on") || StringEqualI(str, "yes") || StringEqualI(str, "true"))
return true;
if ((str == "0") || StringEqualI(str, "n") || StringEqualI(str, "off") || StringEqualI(str, "no") || StringEqualI(str, "false"))
return false;
return std::nullopt;
}
static std::string ToString(bool val)
{
return (val ? "1" : "0");
}
};
}
namespace Trinity
{
template <typename Result, typename... Params>
Optional<Result> StringTo(std::string_view str, Params&&... params)
{
return Trinity::Impl::StringConvertImpl::For<Result>::FromString(str, std::forward<Params>(params)...);
}
template <typename Type, typename... Params>
std::string ToString(Type&& val, Params&&... params)
{
return Trinity::Impl::StringConvertImpl::For<std::decay_t<Type>>::ToString(std::forward<Type>(val), std::forward<Params>(params)...);
}
}
#endif
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