346 lines
13 KiB
C++
346 lines
13 KiB
C++
#pragma once
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#define LOG_MULTITHREAD
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#include <iostream>
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#include <string>
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#include <concepts>
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#include <ranges>
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#include <unordered_map>
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#ifdef LOG_MULTITHREAD
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#include <mutex>
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#endif
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namespace gz {
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inline const char* boolToString(bool b) {
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return b ? "true" : "false";
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}
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const int logLength = 100;
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constexpr unsigned int TIMESTAMP_CHAR_COUNT = 22;
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constexpr unsigned int POSTPREFIX_CHAR_COUNT = 2;
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//
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// CONCEPTS
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//
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/// is std::string or convertible to std::string
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template<typename T>
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concept Stringy = std::same_as<T, std::string> || std::convertible_to<T, std::string_view>;
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/// has .to_string() member
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template<typename T>
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concept HasToString = !Stringy<T> && requires(T t) { { t.to_string() }-> Stringy; };
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/// works with std::to_string(), except bool
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template<typename T>
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concept WorksToString = !std::same_as<T, bool> && !Stringy<T> && !HasToString<T> && requires(T t) { { std::to_string(t) } -> Stringy; };
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/// string-like, has .to_string() member, works with std::to_string() or bool
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template<typename T>
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concept PrintableNoPtr = Stringy<T> || HasToString<T> || WorksToString<T> || std::same_as<T, bool>;
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template<typename T>
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concept Printable = PrintableNoPtr<T> || requires(T t) { { *(t.get()) } -> PrintableNoPtr; };
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/// Type having printable .x and .y members
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template<typename T>
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concept Vector2Printable = !Printable<T> &&
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requires(T t) { { t.x } -> Printable; { t.y } -> Printable; };
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/// Pair having printable elements
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template<typename T>
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concept PairPrintable = !Vector2Printable<T> && !Printable<T> &&
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requires(T p) { { p.first } -> Printable; } && (requires(T p){ { p.second } -> Printable; } || requires(T p){ { p.second } -> Vector2Printable; });
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/// Container having printable elements
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template<typename T>
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concept ContainerPrintable = !Printable<T> && !Vector2Printable<T> && !PairPrintable<T> &&
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std::ranges::forward_range<T> && (Printable<std::ranges::range_reference_t<T>> || Vector2Printable<std::ranges::range_reference_t<T>>);
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/// Container having printable pairs
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template<typename T>
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concept MapPrintable = !Printable<T> && !Vector2Printable<T> && !ContainerPrintable<T> &&
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std::ranges::forward_range<T> && PairPrintable<std::ranges::range_reference_t<T>>;
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template<typename T>
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concept LogableNotPointer = Printable<T> || Vector2Printable<T> || PairPrintable<T> || ContainerPrintable<T> || MapPrintable<T>;
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template<typename T>
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concept LogableSmartPointer = requires(T t) { { *(t.get()) } -> LogableNotPointer; };
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//
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// COLORS
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//
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/// Colors to be used in Log::clog
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enum Color {
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RESET, BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, BBLACK, BRED, BGREEN, BYELLOW, BBLUE, BMAGENTA, BCYAN, BWHITE
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};
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extern const char* COLORS[];
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//
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// LOG
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//
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/**
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* @brief Define types that can be logged with Log
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* @details
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* As of now you can log type T with instance t:
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* -# Any string-like type
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* -# Any type that works with std::to_string()
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* -# Any type that has a to_string() member that returns a string
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* -# Any type with t.x and t.y, provided t.x and t.y satisfy one of 1-3
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* -# Any type with t.first, t.second provided t.first satisfies one of 1-3 and t.second satisfies 1-4
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* -# Any type that has a forward_iterator which references any one of 1-5
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*
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* 1-6 include for example:
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* - int, float, bool...
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* - std::vector<std::string>, std::list<unsigned int>
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* - std::map<A, vec2<float>> if A.to_string() returns a string
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* - ...
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*/
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template<typename T>
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concept Logable = LogableNotPointer<T> || LogableSmartPointer<T>;
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template<typename T>
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class vec2; // defined in gz_math.hpp
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/**
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* @brief Manages printing messages to stdout and to logfiles.
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* @details
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* @subsection log_threads Thread safety
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* Log can use a static mutex for thread safety. To use this feature, you have to #define LOG_MULTITHREAD at the top of log.hpp.
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* Note that log uses the default std::cout buffer, so you should make sure it is not being used while logging something.
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*/
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class Log {
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public:
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/**
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* @brief Creates a log object, which can print messages to stdout and/or write them to a log file
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* @details By creating multiple instances with different parameters, logs can be easily turned on/off for different usages.
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*
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* @param logfile: Name of the file in the logs folder
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* @param showLog: Wether to print the messages to stdout
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* @param storeLog: Wether to save the messages to the logfile
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* @param prefix: A prefix that comes between the timestamp and the message. ": " is automatically appended to the prefix
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* @param prefixColor: The color of the prefix
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*
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* @note Colors will only be shown when written to stdout, not in the logfile.
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*/
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Log(std::string logfile="log.log", bool showLog=true, bool storeLog=true, std::string&& prefix="", Color prefixColor=RESET);
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~Log();
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/**
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* @brief Logs a message
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* @details Depending on the settings of the log instance, the message will be printed to stdout and/or written to the logfile.
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* The current date and time is placed before the message.
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* The message will look like this:
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* <time>: <prefix>: <message>
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* where time will be white, prefix in prefixColor and message white.
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* @param args Any number of arguments that satisfy concept Logable
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*
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*/
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template<Logable... Args>
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void log(Args&&... args) {
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#ifdef LOG_MULTITHREAD
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mtx.lock();
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#endif
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logArray[iter] = getTime();
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logArray[iter] += prefix;
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vlog(" ", std::forward<Args>(args)...);
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logArray[iter] += "\n";
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std::cout << std::string_view(logArray[iter].c_str(), TIMESTAMP_CHAR_COUNT - 1) <<
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COLORS[prefixColor] << prefix << COLORS[RESET] <<
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std::string_view(logArray[iter].begin() + prefixLength, logArray[iter].end());
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if (++iter >= logLength) {
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iter = 0;
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writeLog();
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}
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#ifdef LOG_MULTITHREAD
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mtx.unlock();
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#endif
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}
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/**
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* @brief Logs a message. Overload for convenience, same behavior as log()
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*/
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template<Logable... Args>
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void operator() (Args&&... args) {
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log(std::forward<Args>(args)...);
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}
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/**
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* @brief Log an error
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* @details Prints the message with a red "Error: " prefix.
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* The message will look like this:
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* <time>: <prefix>: Error: <message>
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* where time will be white, prefix in prefixColor, Error in red and message white.
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* @param args Any number of arguments that satisfy concept Logable
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*/
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template<Logable... Args>
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void error(Args&&... args) {
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clog(RED, "Error", WHITE, std::forward<Args>(args)...);
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}
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/**
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* @brief Log a warnign
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* @details Prints the message with a yellow "Warning: " prefix.
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* The message will look like this:
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* <time>: <prefix>: Warning: <message>
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* where time will be white, prefix in prefixColor, Warning in yellow and message white.
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* @param args Any number of arguments that satisfy concept Logable
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*/
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template<Logable... Args>
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void warning(Args&&... args) {
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clog(YELLOW, "Warning", WHITE, std::forward<Args>(args)...);
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}
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/**
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* @brief Log a message in a certain color and with a colored type
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* @details
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* The message will look like this:
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* <time>: <prefix>: <type>: <message>
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* where time will be white, prefix in prefixColor, type in typeColor and message in messageColor
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* @param args Any number of arguments that satisfy concept Logable
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*/
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template<Logable... Args>
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void clog(Color typeColor, std::string&& type, Color messageColor, Args&&... args) {
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#ifdef LOG_MULTITHREAD
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mtx.lock();
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#endif
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logArray[iter] = getTime();
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logArray[iter] += prefix + ": " + type + ": ";
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vlog(" ", std::forward<Args>(args)...);
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logArray[iter] += "\n";
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std::cout << std::string_view(logArray[iter].c_str(), TIMESTAMP_CHAR_COUNT - 1) <<
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COLORS[prefixColor] << prefix << COLORS[typeColor] <<
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std::string_view(logArray[iter].begin() + prefixLength + POSTPREFIX_CHAR_COUNT, logArray[iter].begin() + prefixLength + type.size() + 2 * POSTPREFIX_CHAR_COUNT) <<
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COLORS[messageColor] << std::string_view(logArray[iter].begin() + prefixLength + type.size() + 2 * POSTPREFIX_CHAR_COUNT, logArray[iter].end()) << COLORS[RESET];
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if (++iter >= logLength) {
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iter = 0;
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writeLog();
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}
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#ifdef LOG_MULTITHREAD
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mtx.unlock();
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#endif
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}
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private:
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template<Stringy T, Logable... Args>
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void vlog(const char* appendChars, T&& t, Args&&... args) {
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logArray[iter] += t;
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<HasToString T, Logable... Args>
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void vlog(const char* appendChars, T&& t, Args&&... args) {
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logArray[iter] += t.to_string();
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<WorksToString T, Logable... Args>
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void vlog(const char* appendChars, T&& t, Args&&... args) {
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logArray[iter] += std::to_string(t);
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<typename T, Logable... Args>
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requires(std::same_as<T, bool>)
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void vlog(const char* appendChars, T&& b, Args&&... args) {
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logArray[iter] += boolToString(b);
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<Vector2Printable V, Logable... Args>
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void vlog(const char* appendChars, V&& v, Args&&... args) {
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logArray[iter] += "(";
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vlog("", v.x);
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logArray[iter] += ", ";
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vlog("", v.y);
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logArray[iter] += ")";
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<PairPrintable P, Logable... Args>
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void vlog(const char* appendChars, P&& p, Args&&... args) {
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logArray[iter] += "(";
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vlog("", p.first);
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logArray[iter] += ", ";
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vlog("" ,p.second);
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logArray[iter] += ")";
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<ContainerPrintable T, Logable... Args>
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void vlog(const char* appendChars, T&& t, Args&&... args) {;
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logArray[iter] += "[";
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for (auto it = t.begin(); it != t.end(); it++) {
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vlog(", ", *it);
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}
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logArray[iter] += "]";
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logArray[iter] += appendChars;
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vlog(" ", std::forward< Args>(args)...);
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}
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template<MapPrintable T, Logable... Args>
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void vlog(const char* appendChars, T&& t, Args&&... args) {
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logArray[iter] += "{";
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for (const auto& [k, v] : t) {
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vlog(": ", k);
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vlog(", ", v);
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}
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logArray[iter] += "}";
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logArray[iter] += appendChars;
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vlog(" ", std::forward<Args>(args)...);
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}
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/// Log any logable element that is stored in a pointer
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template<LogableSmartPointer T, Logable... Args>
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void vlog(const char* appendChars, T&& t, Args&&... args) {
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vlog("", *t);
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vlog(" ", std::forward<Args>(args)...);
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}
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void vlog(const char* appendChars) {};
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private:
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std::array<std::string, logLength> logArray;
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size_t iter;
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std::string logFile;
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bool showLog;
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bool storeLog;
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void writeLog();
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Color prefixColor;
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std::string prefix;
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std::string::size_type prefixLength;
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char time[TIMESTAMP_CHAR_COUNT];
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char* getTime();
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#ifdef LOG_MULTITHREAD
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static std::mutex mtx;
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#endif
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};
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extern Log genLog;
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extern Log gameLog;
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extern Log engLog;
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}
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/**
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* @file
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* @brief A logger capable of logging lots of different types and containers to stdout and/or a logfile.
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*/
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