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#pragma once
#include <functional>
#include <sstream>
#ifdef __cpp_lib_source_location
#include <source_location>
#endif
namespace OpenVic {
#ifndef __cpp_lib_source_location
#include <string>
//Implementation of std::source_location for compilers that do not support it
//Note: uses non-standard extensions that are supported by Clang, GCC, and MSVC
//https://clang.llvm.org/docs/LanguageExtensions.html#source-location-builtins
//https://stackoverflow.com/a/67970107
class source_location {
std::string _file;
int _line;
std::string _function;
public:
source_location(std::string f, int l, std::string n) : _file(f), _line(l), _function(n) {}
static source_location current(std::string f = __builtin_FILE(), int l = __builtin_LINE(), std::string n = __builtin_FUNCTION()) {
return source_location(f, l, n);
}
inline char const* file_name() const { return _file.c_str(); }
inline int line() const {return _line; }
inline char const* function_name() const { return _function.c_str(); }
};
#endif
class Logger {
using log_func_t = std::function<void(std::string&&)>;
#ifdef __cpp_lib_source_location
using source_location = std::source_location;
#else
using source_location = OpenVic::source_location;
#endif
static log_func_t info_func, error_func;
static char const* get_filename(char const* filepath);
template <typename... Ts>
struct log {
log(log_func_t log_func, Ts&&... ts, const source_location& location) {
if (log_func) {
std::stringstream stream;
stream << std::endl << get_filename(location.file_name()) << "(" << location.line() << ") `" << location.function_name() << "`: ";
((stream << std::forward<Ts>(ts)), ...);
stream << std::endl;
log_func(stream.str());
}
}
};
public:
static void set_info_func(log_func_t log_func);
static void set_error_func(log_func_t log_func);
template <typename... Ts>
struct info {
info(Ts&&... ts, const source_location& location = source_location::current()) {
log<Ts...>{ info_func, std::forward<Ts>(ts)..., location };
}
};
template <typename... Ts>
info(Ts&&...) -> info<Ts...>;
template <typename... Ts>
struct error {
error(Ts&&... ts, const source_location& location = source_location::current()) {
log<Ts...>{ error_func, std::forward<Ts>(ts)..., location };
}
};
template <typename... Ts>
error(Ts&&...) -> error<Ts...>;
};
}
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