pcsx2/common/StringUtil.h

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/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2021 PCSX2 Dev Team
*
* PCSX2 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 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 PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "Pcsx2Types.h"
#include <charconv>
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#include <cstdarg>
#include <cstddef>
#include <cstring>
#include <iomanip>
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#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>
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#include <sstream>
#ifdef __APPLE__
#include <Availability.h>
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#endif
#endif
namespace StringUtil
{
/// Constructs a std::string from a format string.
#ifdef __GNUC__
std::string StdStringFromFormat(const char* format, ...) __attribute__((format(printf, 1, 2)));
#else
std::string StdStringFromFormat(const char* format, ...);
#endif
std::string StdStringFromFormatV(const char* format, std::va_list ap);
/// Checks if a wildcard matches a search string.
bool WildcardMatch(const char* subject, const char* mask, bool case_sensitive = true);
/// Safe version of strlcpy.
std::size_t Strlcpy(char* dst, const char* src, std::size_t size);
/// Strlcpy from string_view.
std::size_t Strlcpy(char* dst, const std::string_view& src, std::size_t size);
/// Platform-independent strcasecmp
static inline int Strcasecmp(const char* s1, const char* s2)
{
#ifdef _MSC_VER
return _stricmp(s1, s2);
#else
return strcasecmp(s1, s2);
#endif
}
/// Platform-independent strcasecmp
static inline int Strncasecmp(const char* s1, const char* s2, std::size_t n)
{
#ifdef _MSC_VER
return _strnicmp(s1, s2, n);
#else
return strncasecmp(s1, s2, n);
#endif
}
/// Wrapper around std::from_chars
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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;
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;
return value;
}
template <typename T, std::enable_if_t<std::is_floating_point<T>::value, bool> = true>
inline std::optional<T> FromChars(const std::string_view& str)
{
T value;
const fast_float::from_chars_result result = fast_float::from_chars(str.data(), str.data() + str.length(), value);
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if (result.ec != std::errc())
return std::nullopt;
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;
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#else
std::ostringstream ss;
ss.imbue(std::locale::classic());
ss << std::setbase(base) << value;
return ss.str();
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#endif
}
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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
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}
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/// Explicit override for booleans
template <>
inline std::optional<bool> FromChars(const std::string_view& str, int base)
{
if (Strncasecmp("true", str.data(), str.length()) == 0 || Strncasecmp("yes", str.data(), str.length()) == 0 ||
Strncasecmp("on", str.data(), str.length()) == 0 || Strncasecmp("1", str.data(), str.length()) == 0 ||
Strncasecmp("enabled", str.data(), str.length()) == 0 || Strncasecmp("1", str.data(), str.length()) == 0)
{
return true;
}
if (Strncasecmp("false", str.data(), str.length()) == 0 || Strncasecmp("no", str.data(), str.length()) == 0 ||
Strncasecmp("off", str.data(), str.length()) == 0 || Strncasecmp("0", str.data(), str.length()) == 0 ||
Strncasecmp("disabled", str.data(), str.length()) == 0 || Strncasecmp("0", str.data(), str.length()) == 0)
{
return false;
}
return std::nullopt;
}
template <>
inline std::string ToChars(bool value, int base)
{
return std::string(value ? "true" : "false");
}
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/// Encode/decode hexadecimal byte buffers
std::optional<std::vector<u8>> DecodeHex(const std::string_view& str);
std::string EncodeHex(const u8* data, int length);
/// starts_with from C++20
static inline bool StartsWith(const std::string_view& str, const std::string_view& prefix)
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{
return (str.compare(0, prefix.length(), prefix) == 0);
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}
static inline bool EndsWith(const std::string_view& str, const std::string_view& suffix)
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{
const std::size_t suffix_length = suffix.length();
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return (str.length() >= suffix_length && str.compare(str.length() - suffix_length, suffix_length, suffix) == 0);
}
/// StartsWith/EndsWith variants which aren't case sensitive.
static inline bool StartsWithNoCase(const std::string_view& str, const std::string_view& prefix)
{
return (!str.empty() && Strncasecmp(str.data(), prefix.data(), prefix.length()) == 0);
}
static inline bool EndsWithNoCase(const std::string_view& str, const std::string_view& suffix)
{
const std::size_t suffix_length = suffix.length();
return (str.length() >= suffix_length && Strncasecmp(str.data() + (str.length() - suffix_length), suffix.data(), suffix_length) == 0);
}
/// Strip whitespace from the start/end of the string.
std::string_view StripWhitespace(const std::string_view& str);
void StripWhitespace(std::string* str);
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/// Splits a string based on a single character delimiter.
std::vector<std::string_view> SplitString(const std::string_view& str, char delimiter, bool skip_empty = true);
/// Joins a string together using the specified delimiter.
template <typename T>
static inline std::string JoinString(const T& start, const T& end, char delimiter)
{
std::string ret;
for (auto it = start; it != end; ++it)
{
if (it != start)
ret += delimiter;
ret.append(*it);
}
return ret;
}
template <typename T>
static inline std::string JoinString(const T& start, const T& end, const std::string_view& delimiter)
{
std::string ret;
for (auto it = start; it != end; ++it)
{
if (it != start)
ret.append(delimiter);
ret.append(*it);
}
return ret;
}
/// Replaces all instances of search in subject with replacement.
std::string ReplaceAll(const std::string_view& subject, const std::string_view& search, const std::string_view& replacement);
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void ReplaceAll(std::string* subject, const std::string_view& search, const std::string_view& replacement);
/// Parses an assignment string (Key = Value) into its two components.
bool ParseAssignmentString(const std::string_view& str, std::string_view* key, std::string_view* value);
/// Appends a UTF-16/UTF-32 codepoint to a UTF-8 string.
void AppendUTF16CharacterToUTF8(std::string& s, u16 ch);
/// Appends a UTF-16/UTF-32 codepoint to a UTF-8 string.
void EncodeAndAppendUTF8(std::string& s, char32_t ch);
/// Decodes UTF-8 to a single codepoint, updating the position parameter.
/// Returns the number of bytes the codepoint took in the original string.
size_t DecodeUTF8(const void* bytes, size_t length, char32_t* ch);
size_t DecodeUTF8(const std::string_view& str, size_t offset, char32_t* ch);
size_t DecodeUTF8(const std::string& str, size_t offset, char32_t* ch);
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/// Strided memcpy/memcmp.
static inline void StrideMemCpy(void* dst, std::size_t dst_stride, const void* src, std::size_t src_stride,
std::size_t copy_size, std::size_t count)
{
if (src_stride == dst_stride && src_stride == copy_size)
{
std::memcpy(dst, src, src_stride * count);
return;
}
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const u8* src_ptr = static_cast<const u8*>(src);
u8* dst_ptr = static_cast<u8*>(dst);
for (std::size_t i = 0; i < count; i++)
{
std::memcpy(dst_ptr, src_ptr, copy_size);
src_ptr += src_stride;
dst_ptr += dst_stride;
}
}
static inline int StrideMemCmp(const void* p1, std::size_t p1_stride, const void* p2, std::size_t p2_stride,
std::size_t copy_size, std::size_t count)
{
if (p1_stride == p2_stride && p1_stride == copy_size)
return std::memcmp(p1, p2, p1_stride * count);
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const u8* p1_ptr = static_cast<const u8*>(p1);
const u8* p2_ptr = static_cast<const u8*>(p2);
for (std::size_t i = 0; i < count; i++)
{
int result = std::memcmp(p1_ptr, p2_ptr, copy_size);
if (result != 0)
return result;
p2_ptr += p2_stride;
p1_ptr += p1_stride;
}
return 0;
}
std::string toLower(const std::string_view& str);
std::string toUpper(const std::string_view& str);
bool compareNoCase(const std::string_view& str1, const std::string_view& str2);
std::vector<std::string> splitOnNewLine(const std::string& str);
#ifdef _WIN32
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/// Converts the specified UTF-8 string to a wide string.
std::wstring UTF8StringToWideString(const std::string_view& str);
bool UTF8StringToWideString(std::wstring& dest, const std::string_view& str);
/// Converts the specified wide string to a UTF-8 string.
std::string WideStringToUTF8String(const std::wstring_view& str);
bool WideStringToUTF8String(std::string& dest, const std::wstring_view& str);
#endif
/// Converts unsigned 128-bit data to string.
std::string U128ToString(const u128& u);
std::string& AppendU128ToString(const u128& u, std::string& s);
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} // namespace StringUtil