715 lines
22 KiB
C++
715 lines
22 KiB
C++
// Formatting library for C++ - chrono support
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_CHRONO_H_
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#define FMT_CHRONO_H_
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#include "format.h"
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#include "locale.h"
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#include <chrono>
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#include <ctime>
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#include <locale>
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#include <sstream>
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FMT_BEGIN_NAMESPACE
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// Prevents expansion of a preceding token as a function-style macro.
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// Usage: f FMT_NOMACRO()
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#define FMT_NOMACRO
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namespace internal {
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inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); }
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inline null<> localtime_s(...) { return null<>(); }
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inline null<> gmtime_r(...) { return null<>(); }
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inline null<> gmtime_s(...) { return null<>(); }
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} // namespace internal
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// Thread-safe replacement for std::localtime
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inline std::tm localtime(std::time_t time) {
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struct dispatcher {
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std::time_t time_;
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std::tm tm_;
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dispatcher(std::time_t t) : time_(t) {}
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bool run() {
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using namespace fmt::internal;
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return handle(localtime_r(&time_, &tm_));
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}
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bool handle(std::tm* tm) { return tm != nullptr; }
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bool handle(internal::null<>) {
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using namespace fmt::internal;
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return fallback(localtime_s(&tm_, &time_));
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}
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bool fallback(int res) { return res == 0; }
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#if !FMT_MSC_VER
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bool fallback(internal::null<>) {
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using namespace fmt::internal;
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std::tm* tm = std::localtime(&time_);
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if (tm) tm_ = *tm;
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return tm != nullptr;
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}
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#endif
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};
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dispatcher lt(time);
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// Too big time values may be unsupported.
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if (!lt.run()) FMT_THROW(format_error("time_t value out of range"));
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return lt.tm_;
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}
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// Thread-safe replacement for std::gmtime
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inline std::tm gmtime(std::time_t time) {
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struct dispatcher {
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std::time_t time_;
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std::tm tm_;
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dispatcher(std::time_t t) : time_(t) {}
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bool run() {
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using namespace fmt::internal;
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return handle(gmtime_r(&time_, &tm_));
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}
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bool handle(std::tm* tm) { return tm != nullptr; }
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bool handle(internal::null<>) {
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using namespace fmt::internal;
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return fallback(gmtime_s(&tm_, &time_));
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}
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bool fallback(int res) { return res == 0; }
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#if !FMT_MSC_VER
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bool fallback(internal::null<>) {
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std::tm* tm = std::gmtime(&time_);
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if (tm) tm_ = *tm;
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return tm != nullptr;
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}
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#endif
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};
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dispatcher gt(time);
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// Too big time values may be unsupported.
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if (!gt.run()) FMT_THROW(format_error("time_t value out of range"));
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return gt.tm_;
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}
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namespace internal {
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inline std::size_t strftime(char* str, std::size_t count, const char* format,
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const std::tm* time) {
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return std::strftime(str, count, format, time);
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}
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inline std::size_t strftime(wchar_t* str, std::size_t count,
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const wchar_t* format, const std::tm* time) {
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return std::wcsftime(str, count, format, time);
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}
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} // namespace internal
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template <typename Char> struct formatter<std::tm, Char> {
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template <typename ParseContext>
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auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
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auto it = ctx.begin();
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if (it != ctx.end() && *it == ':') ++it;
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auto end = it;
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while (end != ctx.end() && *end != '}') ++end;
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tm_format.reserve(internal::to_unsigned(end - it + 1));
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tm_format.append(it, end);
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tm_format.push_back('\0');
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return end;
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}
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template <typename FormatContext>
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auto format(const std::tm& tm, FormatContext& ctx) -> decltype(ctx.out()) {
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basic_memory_buffer<Char> buf;
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std::size_t start = buf.size();
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for (;;) {
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std::size_t size = buf.capacity() - start;
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std::size_t count =
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internal::strftime(&buf[start], size, &tm_format[0], &tm);
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if (count != 0) {
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buf.resize(start + count);
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break;
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}
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if (size >= tm_format.size() * 256) {
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// If the buffer is 256 times larger than the format string, assume
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// that `strftime` gives an empty result. There doesn't seem to be a
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// better way to distinguish the two cases:
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// https://github.com/fmtlib/fmt/issues/367
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break;
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}
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const std::size_t MIN_GROWTH = 10;
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buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
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}
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return std::copy(buf.begin(), buf.end(), ctx.out());
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}
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basic_memory_buffer<Char> tm_format;
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};
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namespace internal {
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template <typename Period> FMT_CONSTEXPR const char* get_units() {
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return nullptr;
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}
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template <> FMT_CONSTEXPR const char* get_units<std::atto>() { return "as"; }
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template <> FMT_CONSTEXPR const char* get_units<std::femto>() { return "fs"; }
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template <> FMT_CONSTEXPR const char* get_units<std::pico>() { return "ps"; }
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template <> FMT_CONSTEXPR const char* get_units<std::nano>() { return "ns"; }
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template <> FMT_CONSTEXPR const char* get_units<std::micro>() { return "µs"; }
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template <> FMT_CONSTEXPR const char* get_units<std::milli>() { return "ms"; }
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template <> FMT_CONSTEXPR const char* get_units<std::centi>() { return "cs"; }
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template <> FMT_CONSTEXPR const char* get_units<std::deci>() { return "ds"; }
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template <> FMT_CONSTEXPR const char* get_units<std::ratio<1>>() { return "s"; }
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template <> FMT_CONSTEXPR const char* get_units<std::deca>() { return "das"; }
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template <> FMT_CONSTEXPR const char* get_units<std::hecto>() { return "hs"; }
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template <> FMT_CONSTEXPR const char* get_units<std::kilo>() { return "ks"; }
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template <> FMT_CONSTEXPR const char* get_units<std::mega>() { return "Ms"; }
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template <> FMT_CONSTEXPR const char* get_units<std::giga>() { return "Gs"; }
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template <> FMT_CONSTEXPR const char* get_units<std::tera>() { return "Ts"; }
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template <> FMT_CONSTEXPR const char* get_units<std::peta>() { return "Ps"; }
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template <> FMT_CONSTEXPR const char* get_units<std::exa>() { return "Es"; }
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template <> FMT_CONSTEXPR const char* get_units<std::ratio<60>>() {
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return "m";
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}
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template <> FMT_CONSTEXPR const char* get_units<std::ratio<3600>>() {
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return "h";
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}
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enum class numeric_system {
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standard,
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// Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale.
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alternative
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};
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// Parses a put_time-like format string and invokes handler actions.
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template <typename Char, typename Handler>
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FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
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const Char* end,
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Handler&& handler) {
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auto ptr = begin;
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while (ptr != end) {
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auto c = *ptr;
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if (c == '}') break;
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if (c != '%') {
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++ptr;
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continue;
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}
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if (begin != ptr) handler.on_text(begin, ptr);
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++ptr; // consume '%'
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if (ptr == end) FMT_THROW(format_error("invalid format"));
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c = *ptr++;
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switch (c) {
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case '%':
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handler.on_text(ptr - 1, ptr);
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break;
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case 'n': {
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const char newline[] = "\n";
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handler.on_text(newline, newline + 1);
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break;
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}
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case 't': {
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const char tab[] = "\t";
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handler.on_text(tab, tab + 1);
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break;
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}
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// Day of the week:
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case 'a':
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handler.on_abbr_weekday();
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break;
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case 'A':
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handler.on_full_weekday();
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break;
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case 'w':
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handler.on_dec0_weekday(numeric_system::standard);
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break;
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case 'u':
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handler.on_dec1_weekday(numeric_system::standard);
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break;
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// Month:
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case 'b':
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handler.on_abbr_month();
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break;
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case 'B':
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handler.on_full_month();
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break;
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// Hour, minute, second:
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case 'H':
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handler.on_24_hour(numeric_system::standard);
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break;
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case 'I':
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handler.on_12_hour(numeric_system::standard);
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break;
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case 'M':
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handler.on_minute(numeric_system::standard);
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break;
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case 'S':
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handler.on_second(numeric_system::standard);
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break;
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// Other:
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case 'c':
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handler.on_datetime(numeric_system::standard);
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break;
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case 'x':
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handler.on_loc_date(numeric_system::standard);
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break;
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case 'X':
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handler.on_loc_time(numeric_system::standard);
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break;
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case 'D':
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handler.on_us_date();
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break;
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case 'F':
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handler.on_iso_date();
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break;
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case 'r':
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handler.on_12_hour_time();
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break;
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case 'R':
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handler.on_24_hour_time();
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break;
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case 'T':
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handler.on_iso_time();
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break;
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case 'p':
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handler.on_am_pm();
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break;
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case 'Q':
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handler.on_duration_value();
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break;
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case 'q':
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handler.on_duration_unit();
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break;
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case 'z':
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handler.on_utc_offset();
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break;
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case 'Z':
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handler.on_tz_name();
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break;
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// Alternative representation:
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case 'E': {
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if (ptr == end) FMT_THROW(format_error("invalid format"));
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c = *ptr++;
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switch (c) {
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case 'c':
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handler.on_datetime(numeric_system::alternative);
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break;
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case 'x':
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handler.on_loc_date(numeric_system::alternative);
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break;
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case 'X':
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handler.on_loc_time(numeric_system::alternative);
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break;
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default:
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FMT_THROW(format_error("invalid format"));
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}
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break;
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}
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case 'O':
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if (ptr == end) FMT_THROW(format_error("invalid format"));
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c = *ptr++;
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switch (c) {
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case 'w':
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handler.on_dec0_weekday(numeric_system::alternative);
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break;
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case 'u':
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handler.on_dec1_weekday(numeric_system::alternative);
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break;
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case 'H':
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handler.on_24_hour(numeric_system::alternative);
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break;
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case 'I':
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handler.on_12_hour(numeric_system::alternative);
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break;
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case 'M':
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handler.on_minute(numeric_system::alternative);
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break;
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case 'S':
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handler.on_second(numeric_system::alternative);
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break;
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default:
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FMT_THROW(format_error("invalid format"));
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}
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break;
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default:
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FMT_THROW(format_error("invalid format"));
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}
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begin = ptr;
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}
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if (begin != ptr) handler.on_text(begin, ptr);
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return ptr;
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}
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struct chrono_format_checker {
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FMT_NORETURN void report_no_date() { FMT_THROW(format_error("no date")); }
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template <typename Char> void on_text(const Char*, const Char*) {}
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FMT_NORETURN void on_abbr_weekday() { report_no_date(); }
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FMT_NORETURN void on_full_weekday() { report_no_date(); }
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FMT_NORETURN void on_dec0_weekday(numeric_system) { report_no_date(); }
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FMT_NORETURN void on_dec1_weekday(numeric_system) { report_no_date(); }
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FMT_NORETURN void on_abbr_month() { report_no_date(); }
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FMT_NORETURN void on_full_month() { report_no_date(); }
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void on_24_hour(numeric_system) {}
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void on_12_hour(numeric_system) {}
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void on_minute(numeric_system) {}
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void on_second(numeric_system) {}
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FMT_NORETURN void on_datetime(numeric_system) { report_no_date(); }
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FMT_NORETURN void on_loc_date(numeric_system) { report_no_date(); }
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FMT_NORETURN void on_loc_time(numeric_system) { report_no_date(); }
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FMT_NORETURN void on_us_date() { report_no_date(); }
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FMT_NORETURN void on_iso_date() { report_no_date(); }
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void on_12_hour_time() {}
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void on_24_hour_time() {}
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void on_iso_time() {}
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void on_am_pm() {}
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void on_duration_value() {}
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void on_duration_unit() {}
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FMT_NORETURN void on_utc_offset() { report_no_date(); }
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FMT_NORETURN void on_tz_name() { report_no_date(); }
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};
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
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inline bool isnan(T) {
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return false;
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}
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template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
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inline bool isnan(T value) {
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return std::isnan(value);
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}
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template <typename T> inline int to_int(T value) {
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FMT_ASSERT(isnan(value) || (value >= (std::numeric_limits<int>::min)() &&
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value <= (std::numeric_limits<int>::max)()),
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"invalid value");
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return static_cast<int>(value);
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}
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
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inline T mod(T x, int y) {
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return x % y;
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}
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template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
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inline T mod(T x, int y) {
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return std::fmod(x, y);
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}
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// If T is an integral type, maps T to its unsigned counterpart, otherwise
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// leaves it unchanged (unlike std::make_unsigned).
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template <typename T, bool INTEGRAL = std::is_integral<T>::value>
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struct make_unsigned_or_unchanged {
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using type = T;
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};
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template <typename T> struct make_unsigned_or_unchanged<T, true> {
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using type = typename std::make_unsigned<T>::type;
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};
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template <typename Rep, typename Period,
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typename std::enable_if<std::is_integral<Rep>::value, int>::type = 0>
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inline std::chrono::duration<Rep, std::milli> get_milliseconds(
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std::chrono::duration<Rep, Period> d) {
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auto s = std::chrono::duration_cast<std::chrono::seconds>(d);
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return std::chrono::duration_cast<std::chrono::milliseconds>(d - s);
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}
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template <
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typename Rep, typename Period,
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typename std::enable_if<std::is_floating_point<Rep>::value, int>::type = 0>
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inline std::chrono::duration<Rep, std::milli> get_milliseconds(
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std::chrono::duration<Rep, Period> d) {
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return std::chrono::duration<Rep, std::milli>(
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mod(d.count() * Period::num / Period::den * 1000, 1000));
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}
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template <typename Rep, typename OutputIt>
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OutputIt format_chrono_duration_value(OutputIt out, Rep val, int precision) {
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if (precision >= 0) return format_to(out, "{:.{}f}", val, precision);
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return format_to(out, std::is_floating_point<Rep>::value ? "{:g}" : "{}",
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val);
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}
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template <typename Period, typename OutputIt>
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static OutputIt format_chrono_duration_unit(OutputIt out) {
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if (const char* unit = get_units<Period>()) return format_to(out, "{}", unit);
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if (Period::den == 1) return format_to(out, "[{}]s", Period::num);
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return format_to(out, "[{}/{}]s", Period::num, Period::den);
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}
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template <typename FormatContext, typename OutputIt, typename Rep,
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typename Period>
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struct chrono_formatter {
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FormatContext& context;
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OutputIt out;
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int precision;
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// rep is unsigned to avoid overflow.
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using rep =
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conditional_t<std::is_integral<Rep>::value && sizeof(Rep) < sizeof(int),
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unsigned, typename make_unsigned_or_unchanged<Rep>::type>;
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rep val;
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typedef std::chrono::duration<rep> seconds;
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seconds s;
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typedef std::chrono::duration<rep, std::milli> milliseconds;
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bool negative;
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typedef typename FormatContext::char_type char_type;
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explicit chrono_formatter(FormatContext& ctx, OutputIt o,
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std::chrono::duration<Rep, Period> d)
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: context(ctx), out(o), val(d.count()), negative(false) {
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if (d.count() < 0) {
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val = -val;
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negative = true;
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}
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s = std::chrono::duration_cast<seconds>(
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std::chrono::duration<rep, Period>(val));
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}
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Rep hour() const { return mod((s.count() / 3600), 24); }
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Rep hour12() const {
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Rep hour = mod((s.count() / 3600), 12);
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return hour <= 0 ? 12 : hour;
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}
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Rep minute() const { return mod((s.count() / 60), 60); }
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Rep second() const { return mod(s.count(), 60); }
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std::tm time() const {
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auto time = std::tm();
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time.tm_hour = to_int(hour());
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time.tm_min = to_int(minute());
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time.tm_sec = to_int(second());
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return time;
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}
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void write_sign() {
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if (negative) {
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*out++ = '-';
|
|
negative = false;
|
|
}
|
|
}
|
|
|
|
void write(Rep value, int width) {
|
|
write_sign();
|
|
if (isnan(value)) return write_nan();
|
|
typedef typename int_traits<int>::main_type main_type;
|
|
main_type n = to_unsigned(to_int(value));
|
|
int num_digits = internal::count_digits(n);
|
|
if (width > num_digits) out = std::fill_n(out, width - num_digits, '0');
|
|
out = format_decimal<char_type>(out, n, num_digits);
|
|
}
|
|
|
|
void write_nan() { std::copy_n("nan", 3, out); }
|
|
|
|
void format_localized(const tm& time, const char* format) {
|
|
if (isnan(val)) return write_nan();
|
|
auto locale = context.locale().template get<std::locale>();
|
|
auto& facet = std::use_facet<std::time_put<char_type>>(locale);
|
|
std::basic_ostringstream<char_type> os;
|
|
os.imbue(locale);
|
|
facet.put(os, os, ' ', &time, format, format + std::strlen(format));
|
|
auto str = os.str();
|
|
std::copy(str.begin(), str.end(), out);
|
|
}
|
|
|
|
void on_text(const char_type* begin, const char_type* end) {
|
|
std::copy(begin, end, out);
|
|
}
|
|
|
|
// These are not implemented because durations don't have date information.
|
|
void on_abbr_weekday() {}
|
|
void on_full_weekday() {}
|
|
void on_dec0_weekday(numeric_system) {}
|
|
void on_dec1_weekday(numeric_system) {}
|
|
void on_abbr_month() {}
|
|
void on_full_month() {}
|
|
void on_datetime(numeric_system) {}
|
|
void on_loc_date(numeric_system) {}
|
|
void on_loc_time(numeric_system) {}
|
|
void on_us_date() {}
|
|
void on_iso_date() {}
|
|
void on_utc_offset() {}
|
|
void on_tz_name() {}
|
|
|
|
void on_24_hour(numeric_system ns) {
|
|
if (ns == numeric_system::standard) return write(hour(), 2);
|
|
auto time = tm();
|
|
time.tm_hour = to_int(hour());
|
|
format_localized(time, "%OH");
|
|
}
|
|
|
|
void on_12_hour(numeric_system ns) {
|
|
if (ns == numeric_system::standard) return write(hour12(), 2);
|
|
auto time = tm();
|
|
time.tm_hour = hour12();
|
|
format_localized(time, "%OI");
|
|
}
|
|
|
|
void on_minute(numeric_system ns) {
|
|
if (ns == numeric_system::standard) return write(minute(), 2);
|
|
auto time = tm();
|
|
time.tm_min = minute();
|
|
format_localized(time, "%OM");
|
|
}
|
|
|
|
void on_second(numeric_system ns) {
|
|
if (ns == numeric_system::standard) {
|
|
write(second(), 2);
|
|
auto ms = get_milliseconds(std::chrono::duration<Rep, Period>(val));
|
|
if (ms != std::chrono::milliseconds(0)) {
|
|
*out++ = '.';
|
|
write(ms.count(), 3);
|
|
}
|
|
return;
|
|
}
|
|
auto time = tm();
|
|
time.tm_sec = second();
|
|
format_localized(time, "%OS");
|
|
}
|
|
|
|
void on_12_hour_time() { format_localized(time(), "%r"); }
|
|
|
|
void on_24_hour_time() {
|
|
write(hour(), 2);
|
|
*out++ = ':';
|
|
write(minute(), 2);
|
|
}
|
|
|
|
void on_iso_time() {
|
|
on_24_hour_time();
|
|
*out++ = ':';
|
|
write(second(), 2);
|
|
}
|
|
|
|
void on_am_pm() { format_localized(time(), "%p"); }
|
|
|
|
void on_duration_value() {
|
|
write_sign();
|
|
out = format_chrono_duration_value(out, val, precision);
|
|
}
|
|
|
|
void on_duration_unit() { out = format_chrono_duration_unit<Period>(out); }
|
|
};
|
|
} // namespace internal
|
|
|
|
template <typename Rep, typename Period, typename Char>
|
|
struct formatter<std::chrono::duration<Rep, Period>, Char> {
|
|
private:
|
|
align_spec spec;
|
|
int precision;
|
|
typedef internal::arg_ref<Char> arg_ref_type;
|
|
arg_ref_type width_ref;
|
|
arg_ref_type precision_ref;
|
|
mutable basic_string_view<Char> format_str;
|
|
typedef std::chrono::duration<Rep, Period> duration;
|
|
|
|
struct spec_handler {
|
|
formatter& f;
|
|
basic_parse_context<Char>& context;
|
|
basic_string_view<Char> format_str;
|
|
|
|
template <typename Id> FMT_CONSTEXPR arg_ref_type make_arg_ref(Id arg_id) {
|
|
context.check_arg_id(arg_id);
|
|
return arg_ref_type(arg_id);
|
|
}
|
|
|
|
FMT_CONSTEXPR arg_ref_type make_arg_ref(basic_string_view<Char> arg_id) {
|
|
context.check_arg_id(arg_id);
|
|
const auto str_val = internal::string_view_metadata(format_str, arg_id);
|
|
return arg_ref_type(str_val);
|
|
}
|
|
|
|
FMT_CONSTEXPR arg_ref_type make_arg_ref(internal::auto_id) {
|
|
return arg_ref_type(context.next_arg_id());
|
|
}
|
|
|
|
void on_error(const char* msg) { FMT_THROW(format_error(msg)); }
|
|
void on_fill(Char fill) { f.spec.fill_ = fill; }
|
|
void on_align(alignment align) { f.spec.align_ = align; }
|
|
void on_width(unsigned width) { f.spec.width_ = width; }
|
|
void on_precision(unsigned precision) { f.precision = precision; }
|
|
void end_precision() {}
|
|
|
|
template <typename Id> void on_dynamic_width(Id arg_id) {
|
|
f.width_ref = make_arg_ref(arg_id);
|
|
}
|
|
|
|
template <typename Id> void on_dynamic_precision(Id arg_id) {
|
|
f.precision_ref = make_arg_ref(arg_id);
|
|
}
|
|
};
|
|
|
|
typedef typename basic_parse_context<Char>::iterator iterator;
|
|
struct parse_range {
|
|
iterator begin;
|
|
iterator end;
|
|
};
|
|
|
|
FMT_CONSTEXPR parse_range do_parse(basic_parse_context<Char>& ctx) {
|
|
auto begin = ctx.begin(), end = ctx.end();
|
|
if (begin == end || *begin == '}') return {begin, begin};
|
|
spec_handler handler{*this, ctx, format_str};
|
|
begin = internal::parse_align(begin, end, handler);
|
|
if (begin == end) return {begin, begin};
|
|
begin = internal::parse_width(begin, end, handler);
|
|
if (begin == end) return {begin, begin};
|
|
if (*begin == '.') {
|
|
if (std::is_floating_point<Rep>::value)
|
|
begin = internal::parse_precision(begin, end, handler);
|
|
else
|
|
handler.on_error("precision not allowed for this argument type");
|
|
}
|
|
end = parse_chrono_format(begin, end, internal::chrono_format_checker());
|
|
return {begin, end};
|
|
}
|
|
|
|
public:
|
|
formatter() : spec(), precision(-1) {}
|
|
|
|
FMT_CONSTEXPR auto parse(basic_parse_context<Char>& ctx)
|
|
-> decltype(ctx.begin()) {
|
|
auto range = do_parse(ctx);
|
|
format_str = basic_string_view<Char>(
|
|
&*range.begin, internal::to_unsigned(range.end - range.begin));
|
|
return range.end;
|
|
}
|
|
|
|
template <typename FormatContext>
|
|
auto format(const duration& d, FormatContext& ctx) -> decltype(ctx.out()) {
|
|
auto begin = format_str.begin(), end = format_str.end();
|
|
// As a possible future optimization, we could avoid extra copying if width
|
|
// is not specified.
|
|
basic_memory_buffer<Char> buf;
|
|
auto out = std::back_inserter(buf);
|
|
typedef output_range<decltype(ctx.out()), Char> range;
|
|
basic_writer<range> w(range(ctx.out()));
|
|
internal::handle_dynamic_spec<internal::width_checker>(
|
|
spec.width_, width_ref, ctx, format_str.begin());
|
|
internal::handle_dynamic_spec<internal::precision_checker>(
|
|
precision, precision_ref, ctx, format_str.begin());
|
|
if (begin == end || *begin == '}') {
|
|
out = internal::format_chrono_duration_value(out, d.count(), precision);
|
|
internal::format_chrono_duration_unit<Period>(out);
|
|
} else {
|
|
internal::chrono_formatter<FormatContext, decltype(out), Rep, Period> f(
|
|
ctx, out, d);
|
|
f.precision = precision;
|
|
parse_chrono_format(begin, end, f);
|
|
}
|
|
w.write(buf.data(), buf.size(), spec);
|
|
return w.out();
|
|
}
|
|
};
|
|
|
|
FMT_END_NAMESPACE
|
|
|
|
#endif // FMT_CHRONO_H_
|