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#pragma once
#include <asl/format.hpp>
#include <asl/utility.hpp>
#include <asl/box.hpp>
namespace asl::log
{
enum level : uint8_t
{
kDebug = 0,
kInfo,
kWarning,
kError,
};
struct message
{
level level;
string_view message;
source_location location;
};
// @Todo Write and use an intrusive doubly-linked list
class Logger
{
Logger* m_next{};
public:
Logger() = default;
ASL_DEFAULT_COPY_MOVE(Logger);
virtual ~Logger() = default;
virtual void log(const message&) = 0;
friend void register_logger(box<Logger>);
constexpr Logger* next_logger() const { return m_next; }
};
// @Todo Make a deref_as trait & deref utility
// @Todo Accept writer as box, pointer, reference, or value
class DefaultLogger : public Logger
{
Writer* m_writer;
public:
explicit constexpr DefaultLogger(Writer* writer) : m_writer{writer} {}
void log(const message&) override;
};
void register_logger(box<Logger>);
// @Todo Add a way to remove loggers (including all)
template<typename T, typename... Args>
requires constructible_from<T, Args&&...> && convertible_from<Logger*, T*>
void register_logger(Args&&... args)
{
register_logger(make_box<T>(ASL_FWD(args)...));
}
void log_inner(level l, string_view fmt, span<const format_internals::type_erased_arg> args, const source_location& sl);
template<formattable... Args>
void log(level l, const source_location& sl, string_view fmt, const Args&... args)
{
format_internals::type_erased_arg type_erased_args[] = {
format_internals::type_erased_arg(args)...
};
log_inner(l, fmt, type_erased_args, sl);
}
} // namespace asl::log
// @Todo Compile-time configuration of logging
#define ASL_LOG_DEBUG(...) ::asl::log::log(::asl::log::kDebug, ::asl::source_location{}, __VA_ARGS__)
#define ASL_LOG_INFO(...) ::asl::log::log(::asl::log::kInfo, ::asl::source_location{}, __VA_ARGS__)
#define ASL_LOG_WARNING(...) ::asl::log::log(::asl::log::kWarning, ::asl::source_location{}, __VA_ARGS__)
#define ASL_LOG_ERROR(...) ::asl::log::log(::asl::log::kError, ::asl::source_location{}, __VA_ARGS__)
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