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Common: Add StringUtil::ToChars() wrapper

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This commit is contained in:
Connor McLaughlin
2022-09-25 16:23:14 +10:00
committed by lightningterror
parent b3590430c9
commit af646e4496
10 changed files with 158 additions and 25 deletions
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85
common/StringUtil.h
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@@ -15,6 +15,7 @@
#pragma once
#include "Pcsx2Types.h"
#include <charconv>
#include <cstdarg>
#include <cstddef>
#include <cstring>
@@ -24,13 +25,16 @@
#include <string_view>
#include <vector>
#if defined(__has_include) && __has_include(<charconv>)
#include <charconv>
#ifndef _MSC_VER
#include "fast_float/fast_float.h"
// Older versions of libstdc++ are missing support for from_chars() with floats, and was only recently
// merged in libc++. So, just fall back to stringstream (yuck!) on everywhere except MSVC.
#if !defined(_MSC_VER)
#include <locale>
#include <sstream>
#ifdef __APPLE__
#include <Availability.h>
#endif
#else
#include <sstream>
#endif
namespace StringUtil
@@ -72,23 +76,15 @@ namespace StringUtil
#endif
}
/// Wrapper arond std::from_chars
/// Wrapper around std::from_chars
template <typename T, std::enable_if_t<std::is_integral<T>::value, bool> = true>
inline std::optional<T> FromChars(const std::string_view& str, int base = 10)
{
T value;
#if defined(__has_include) && __has_include(<charconv>)
const std::from_chars_result result = std::from_chars(str.data(), str.data() + str.length(), value, base);
if (result.ec != std::errc())
return std::nullopt;
#else
std::string temp(str);
std::istringstream ss(temp);
ss >> std::setbase(base) >> value;
if (ss.fail())
return std::nullopt;
#endif
return value;
}
@@ -98,22 +94,57 @@ namespace StringUtil
{
T value;
#if defined(__has_include) && __has_include(<charconv>) && defined(_MSC_VER)
const std::from_chars_result result = std::from_chars(str.data(), str.data() + str.length(), value);
const fast_float::from_chars_result result = fast_float::from_chars(str.data(), str.data() + str.length(), value);
if (result.ec != std::errc())
return std::nullopt;
#else
/// libstdc++ does not support from_chars with floats yet
std::string temp(str);
std::istringstream ss(temp);
ss >> value;
if (ss.fail())
return std::nullopt;
#endif
return value;
}
/// Wrapper around std::to_chars
template <typename T, std::enable_if_t<std::is_integral<T>::value, bool> = true>
inline std::string ToChars(T value, int base = 10)
{
// to_chars() requires macOS 10.15+.
#if !defined(__APPLE__) || MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_15
constexpr size_t MAX_SIZE = 32;
char buf[MAX_SIZE];
std::string ret;
const std::to_chars_result result = std::to_chars(buf, buf + MAX_SIZE, value, base);
if (result.ec == std::errc())
ret.append(buf, result.ptr - buf);
return ret;
#else
std::ostringstream ss;
ss.imbue(std::locale::classic());
ss << std::setbase(base) << value;
return ss.str();
#endif
}
template <typename T, std::enable_if_t<std::is_floating_point<T>::value, bool> = true>
inline std::string ToChars(T value)
{
// No to_chars() in older versions of libstdc++/libc++.
#ifdef _MSC_VER
constexpr size_t MAX_SIZE = 64;
char buf[MAX_SIZE];
std::string ret;
const std::to_chars_result result = std::to_chars(buf, buf + MAX_SIZE, value);
if (result.ec == std::errc())
ret.append(buf, result.ptr - buf);
return ret;
#else
std::ostringstream ss;
ss.imbue(std::locale::classic());
ss << value;
return ss.str();
#endif
}
/// Explicit override for booleans
template <>
inline std::optional<bool> FromChars(const std::string_view& str, int base)
@@ -135,6 +166,12 @@ namespace StringUtil
return std::nullopt;
}
template <>
inline std::string ToChars(bool value, int base)
{
return std::string(value ? "true" : "false");
}
/// Encode/decode hexadecimal byte buffers
std::optional<std::vector<u8>> DecodeHex(const std::string_view& str);
std::string EncodeHex(const u8* data, int length);