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#pragma once
#include <functional>
#include <queue>
#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 final {
using log_func_t = std::function<void(std::string&&)>;
using log_queue_t = std::queue<std::string>;
#ifdef __cpp_lib_source_location
using source_location = std::source_location;
#else
using source_location = OpenVic::source_location;
#endif
public:
static void set_logger_funcs();
static char const* get_filename(char const* filepath, char const* default_path = nullptr);
private:
struct log_channel_t {
log_func_t func;
log_queue_t queue;
};
template<typename... Ts>
struct log {
log(log_channel_t& log_channel, Ts&&... ts, source_location const& location) {
std::stringstream stream;
stream << "\n" << get_filename(location.file_name()) << "("
//<< location.line() << ") `" << location.function_name() << "`: ";
<< location.line() << "): ";
((stream << std::forward<Ts>(ts)), ...);
stream << std::endl;
log_channel.queue.push(stream.str());
if (log_channel.func) {
do {
log_channel.func(std::move(log_channel.queue.front()));
log_channel.queue.pop();
} while (!log_channel.queue.empty());
}
}
};
#define LOG_FUNC(name) \
private: \
static inline log_channel_t name##_channel{}; \
public: \
static inline void set_##name##_func(log_func_t log_func) { \
name##_channel.func = log_func; \
} \
template<typename... Ts> \
struct name { \
name(Ts&&... ts, source_location const& location = source_location::current()) { \
log<Ts...>{ name##_channel, std::forward<Ts>(ts)..., location }; \
} \
}; \
template<typename... Ts> \
name(Ts&&...) -> name<Ts...>;
LOG_FUNC(info)
LOG_FUNC(warning)
LOG_FUNC(error)
#undef LOG_FUNC
};
}
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