rpcs3/Utilities/StrFmt.h

111 lines
3.0 KiB
C++

#pragma once
#include <string>
#include <vector>
#include <ostream>
#include <sstream>
#include <cstdio>
#if defined(_MSC_VER)
#define snprintf _snprintf
#endif
namespace fmt{
using std::string;
using std::ostream;
using std::ostringstream;
struct empty_t{};
extern const string placeholder;
// write `fmt` from `pos` to the first occurence of `fmt::placeholder` to
// the stream `os`. Then write `arg` to to the stream. If there's no
// `fmt::placeholder` after `pos` everything in `fmt` after pos is written
// to `os`. Then `arg` is written to `os` after appending a space character
template<typename T>
empty_t write(const string &fmt, ostream &os, string::size_type &pos, T &&arg)
{
string::size_type ins = fmt.find(placeholder, pos);
if (ins == string::npos)
{
os.write(fmt.data() + pos, fmt.size() - pos);
os << ' ' << arg;
pos = fmt.size();
}
else
{
os.write(fmt.data() + pos, ins - pos);
os << arg;
pos = ins + placeholder.size();
}
return{};
}
// typesafe version of a sprintf-like function. Returns the printed to
// string. To mark positions where the arguments are supposed to be
// inserted use `fmt::placeholder`. If there's not enough placeholders
// the rest of the arguments are appended at the end, seperated by spaces
template<typename ... Args>
string SFormat(const string &fmt, Args&& ... parameters)
{
ostringstream os;
string::size_type pos = 0;
std::initializer_list<empty_t> { write(fmt, os, pos, parameters)... };
if (!fmt.empty())
{
os.write(fmt.data() + pos, fmt.size() - pos);
}
string result = os.str();
return result;
}
//small wrapper used to deal with bitfields
template<typename T>
T by_value(T x) { return x; }
//wrapper to deal with advance sprintf formating options with automatic length finding
//can't take strings by reference because of "va_start", so overload it with char *
string FormatV(const char *fmt, va_list args);
string FormatV(string fmt, va_list args);
//wrapper to deal with advance sprintf formating options with automatic length finding
template<typename ... Args>
string Format(const string &fmt, Args&& ... parameters)
{
int length = 256;
string str;
for (;;)
{
std::vector<char> buffptr(length);
size_t printlen = snprintf(buffptr.data(), length, fmt.c_str(), std::forward<Args>(parameters)...);
if (printlen >= 0 && printlen < length)
{
str = string(buffptr.data(), printlen);
break;
}
length *= 2;
}
return str;
}
//convert a wxString to a std::string encoded in utf8
//CAUTION, only use this to interface with wxWidgets classes
std::string ToUTF8(const wxString& right);
//convert a std::string encoded in utf8 to a wxString
//CAUTION, only use this to interface with wxWidgets classes
wxString FromUTF8(const string& right);
//TODO: remove this after every snippet that uses it is gone
//WARNING: not fully compatible with CmpNoCase from wxString
int CmpNoCase(const std::string& a, const std::string& b);
}