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fmt.display.h
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// !!!deprecated use #include "fmt/full.h" or #include "fmt/display.h"
// fmt::display.h
#ifndef FMT_DISPLAY_H
#define FMT_DISPLAY_H
// #define FMT_DISPLAY_COMPILE_TIME_ERROR // NOT RECOMMENDED [as hard to find error location] uncomment if you want to use runtime type checking...
#include <sstream> // For std::ostringstream
#include <type_traits> // ?
#include <typeinfo> // ?
#include <memory>
#include <stdexcept>
#include <iostream>
namespace ansi {
// ANSI styles
constexpr auto reset = "\033[0m";
constexpr auto bold = "\033[1m";
constexpr auto italic = "\033[3m";
constexpr auto underline = "\033[4m";
constexpr auto blink = "\033[5m";
constexpr auto reverse = "\033[7m";
constexpr auto hidden = "\033[8m";
constexpr auto strikethrough = "\033[9m";
// ANSI text colors
constexpr auto black = "\033[30m";
constexpr auto red = "\033[31m";
constexpr auto green = "\033[32m";
constexpr auto yellow = "\033[33m";
constexpr auto blue = "\033[34m";
constexpr auto magenta = "\033[35m";
constexpr auto cyan = "\033[36m";
constexpr auto white = "\033[37m";
// ANSI background colors
constexpr auto bg_black = "\033[40m";
constexpr auto bg_red = "\033[41m";
constexpr auto bg_green = "\033[42m";
constexpr auto bg_yellow = "\033[43m";
constexpr auto bg_blue = "\033[44m";
constexpr auto bg_magenta = "\033[45m";
constexpr auto bg_cyan = "\033[46m";
constexpr auto bg_white = "\033[47m";
}
namespace fmt {
template<typename ... Args>
std::string string_format( const std::string& format, Args ... args ){
int size_s = std::snprintf( nullptr, 0, format.c_str(), args ... ) + 1; // Extra space for '\0'
if( size_s <= 0 ){ throw std::runtime_error("\033[31mError during formatting.\033[0m"); }
auto size = static_cast<size_t>( size_s );
std::unique_ptr<char[]> buf( new char[ size ] );
std::snprintf( buf.get(), size, format.c_str(), args ... );
return std::string( buf.get(), buf.get() + size - 1 ); // We don't want the '\0' inside
}
template<typename T>
struct Display {
void print(const T &data){
std::cout<<"Not implemented yet"<<std::endl;
}
};
namespace detail {
// Helper trait to check if a type has an operator<< for std::ostream
template<typename T, typename = void>
struct is_printable : std::false_type {};
template<typename T>
struct is_printable<T, std::void_t<decltype(std::declval<std::ostream&>() << std::declval<T>())>> : std::true_type {};
template<typename T>
struct has_display {
private:
// Helper type for SFINAE to detect the presence of Display<T>::print
template<typename U>
static auto test(int) -> decltype(Display<U>::print(std::declval<U>()), std::true_type{});
template<typename>
static std::false_type test(...);
public:
static constexpr bool value = decltype(test<T>(0))::value;
};
// Helper trait to check if a type should be printed
template<typename T>
struct ShouldPrint {
static constexpr bool value = has_display<T>::value;
};
// Implementation for types that should be printed
template<typename T>
inline void print_impl(const T& arg) {
#ifdef FMT_DISPLAY_COMPILE_TIME_ERROR
static_assert(ShouldPrint<T>::value || is_printable<T>::value,
"\033[34m\n\n \
\n********************************************************************** \033[0m\033[31m \
\nError: fmt::Display is not implemented for some type \
\nPlease implement the appropriate traits for this type. \
\nIf you are using a custom type, consider adding fmt::Display<T> specialization. \
\n\033[34m********************************************************************** \
\n\n\033[0m");
#endif
if constexpr (ShouldPrint<T>::value) {
std::cout << Display<T>::print(arg);
}else{
#ifdef FMT_DISPLAY_COMPILE_TIME_ERROR
std::cout << arg;
#else
if constexpr (is_printable<T>::value) {
std::cout << arg;
} else {
std::cout << std::endl << std::endl << ansi::red << "Error : fmt::Display is not implemented for type : " << typeid(T).name() << ansi::reset << std::endl << std::endl ; // Red Error message
throw std::runtime_error( "fmt::Display is not implemented yet" );
}
#endif
}
}
// Implementation for types that should be printed
template<typename T>
inline void print_impl_oss(const T& arg, std::ostringstream &oss) {
#ifdef FMT_DISPLAY_COMPILE_TIME_ERROR
static_assert(ShouldPrint<T>::value || is_printable<T>::value,
"\033[34m\n\n \
\n********************************************************************** \033[0m\033[31m \
\nError: fmt::Display is not implemented for some type \
\nPlease implement the appropriate traits for this type. \
\nIf you are using a custom type, consider adding fmt::Display<T> specialization. \
\n\033[34m********************************************************************** \
\n\n\033[0m");
#endif
if constexpr (ShouldPrint<T>::value) {
oss << Display<T>::print(arg);
}else{
#ifdef FMT_DISPLAY_COMPILE_TIME_ERROR
oss << arg;
#else
if constexpr (is_printable<T>::value) {
oss << arg;
} else {
// oss << ansi::red << "Error : fmt::Display is not implemented yet" << ansi::reset; // Red Warning message
std::cout << std::endl << std::endl << ansi::red << "Error : fmt::Display is not implemented for type : " << typeid(T).name() << ansi::reset << std::endl << std::endl ; // Red Error message
throw std::runtime_error( "fmt::Display is not implemented yet" );
}
#endif
}
}
}
template<typename... Args>
inline void print(const Args&... args) {
(detail::print_impl(args), ...);
}
template<typename... Args>
inline void println(const Args&... args) {
(detail::print_impl(args), ...);
std::cout << std::endl;
}
template<typename... Args>
inline std::string sprint(const Args&... args) {
std::ostringstream oss;
(detail::print_impl_oss(args, oss), ...);
return oss.str();
}
template<typename... Args>
inline std::string sprintln(const Args&... args) {
std::ostringstream oss;
(detail::print_impl_oss(args, oss), ...);
oss << std::endl;
return oss.str();
}
class fmtout{
std::ostringstream oss;
public:
fmtout(){}
template<typename T>
fmtout(const T &str){oss<<str;}
template<typename T>
fmtout& operator<<(const T& value) {
detail::print_impl_oss(value, oss);
return *this;
}
template<typename... Args>
inline void print(const Args&... args) {
(detail::print_impl_oss(args, oss), ...);
}
template<typename... Args>
inline void println(const Args&... args) {
(detail::print_impl_oss(args, oss), ...);
oss << std::endl;
}
std::string str() const { return oss.str(); }
void clear() { oss.str(""); oss.clear(); }
};
}
template<>
struct fmt::Display<fmt::fmtout> {
static std::string print(const fmt::fmtout &data) {
return data.str();
}
};
template<>
struct fmt::Display<bool> {
static std::string print(const bool &data) {
if (data) return "True";
else return "False";
}
};
// Display specializations for standard containers
#include <vector> // for vector printing
template<typename T>
struct fmt::Display<std::vector<T>> {
static std::string print(const std::vector<T> &data) {
fmt::fmtout result;
result.print('[');
bool first = true;
for (const auto& item : data) {
if (!first) result.print(", ");
result.print(item);
first = false;
}
result.print(']');
return result.str();
}
};
#include <map>
template<typename K, typename V>
struct fmt::Display<std::map<K, V>> {
static std::string print(const std::map<K, V>& map) {
fmt::fmtout out;
out << "{";
bool first = true;
for (const auto& [key, value] : map) {
if (!first) out << ", ";
out << key << ": " << value;
first = false;
}
out << "}";
return out.str();
}
};
#include <set>
template<typename T>
struct fmt::Display<std::set<T>> {
static std::string print(const std::set<T>& set) {
fmtout out;
out << "{";
bool first = true;
for (const auto& value : set) {
if (!first) out << ", ";
out << value;
first = false;
}
out << "}";
return out.str();
}
};
#if __cplusplus >= 201703L // C++17 or newer
#include <optional>
template<typename T>
struct fmt::Display<std::optional<T>> {
static std::string print(const std::optional<T>& opt) {
if (opt) return sprint("Some(", *opt, ")");
else return "None";
}
};
#include <variant>
template<typename... Types>
struct fmt::Display<std::variant<Types...>> {
static std::string print(const std::variant<Types...>& var) {
return std::visit([](const auto& value) {
return sprint("Variant(", value, ")");
}, var);
}
};
#endif // __cplusplus >= 201703L
#endif