| 1 | // Formatting library for C++ - chrono support |
| 2 | // |
| 3 | // Copyright (c) 2012 - present, Victor Zverovich |
| 4 | // All rights reserved. |
| 5 | // |
| 6 | // For the license information refer to format.h. |
| 7 | |
| 8 | #ifndef FMT_CHRONO_H_ |
| 9 | #define FMT_CHRONO_H_ |
| 10 | |
| 11 | #include <algorithm> |
| 12 | #include <chrono> |
| 13 | #include <ctime> |
| 14 | #include <iterator> |
| 15 | #include <locale> |
| 16 | #include <ostream> |
| 17 | #include <type_traits> |
| 18 | |
| 19 | #include "format.h" |
| 20 | |
| 21 | FMT_BEGIN_NAMESPACE |
| 22 | |
| 23 | // Enable tzset. |
| 24 | #ifndef FMT_USE_TZSET |
| 25 | // UWP doesn't provide _tzset. |
| 26 | # if FMT_HAS_INCLUDE("winapifamily.h") |
| 27 | # include <winapifamily.h> |
| 28 | # endif |
| 29 | # if defined(_WIN32) && (!defined(WINAPI_FAMILY) || \ |
| 30 | (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)) |
| 31 | # define FMT_USE_TZSET 1 |
| 32 | # else |
| 33 | # define FMT_USE_TZSET 0 |
| 34 | # endif |
| 35 | #endif |
| 36 | |
| 37 | // Enable safe chrono durations, unless explicitly disabled. |
| 38 | #ifndef FMT_SAFE_DURATION_CAST |
| 39 | # define FMT_SAFE_DURATION_CAST 1 |
| 40 | #endif |
| 41 | #if FMT_SAFE_DURATION_CAST |
| 42 | |
| 43 | // For conversion between std::chrono::durations without undefined |
| 44 | // behaviour or erroneous results. |
| 45 | // This is a stripped down version of duration_cast, for inclusion in fmt. |
| 46 | // See https://github.com/pauldreik/safe_duration_cast |
| 47 | // |
| 48 | // Copyright Paul Dreik 2019 |
| 49 | namespace safe_duration_cast { |
| 50 | |
| 51 | template <typename To, typename From, |
| 52 | FMT_ENABLE_IF(!std::is_same<From, To>::value && |
| 53 | std::numeric_limits<From>::is_signed == |
| 54 | std::numeric_limits<To>::is_signed)> |
| 55 | FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) { |
| 56 | ec = 0; |
| 57 | using F = std::numeric_limits<From>; |
| 58 | using T = std::numeric_limits<To>; |
| 59 | static_assert(F::is_integer, "From must be integral"); |
| 60 | static_assert(T::is_integer, "To must be integral"); |
| 61 | |
| 62 | // A and B are both signed, or both unsigned. |
| 63 | if (detail::const_check(F::digits <= T::digits)) { |
| 64 | // From fits in To without any problem. |
| 65 | } else { |
| 66 | // From does not always fit in To, resort to a dynamic check. |
| 67 | if (from < (T::min)() || from > (T::max)()) { |
| 68 | // outside range. |
| 69 | ec = 1; |
| 70 | return {}; |
| 71 | } |
| 72 | } |
| 73 | return static_cast<To>(from); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * converts From to To, without loss. If the dynamic value of from |
| 78 | * can't be converted to To without loss, ec is set. |
| 79 | */ |
| 80 | template <typename To, typename From, |
| 81 | FMT_ENABLE_IF(!std::is_same<From, To>::value && |
| 82 | std::numeric_limits<From>::is_signed != |
| 83 | std::numeric_limits<To>::is_signed)> |
| 84 | FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) { |
| 85 | ec = 0; |
| 86 | using F = std::numeric_limits<From>; |
| 87 | using T = std::numeric_limits<To>; |
| 88 | static_assert(F::is_integer, "From must be integral"); |
| 89 | static_assert(T::is_integer, "To must be integral"); |
| 90 | |
| 91 | if (detail::const_check(F::is_signed && !T::is_signed)) { |
| 92 | // From may be negative, not allowed! |
| 93 | if (fmt::detail::is_negative(from)) { |
| 94 | ec = 1; |
| 95 | return {}; |
| 96 | } |
| 97 | // From is positive. Can it always fit in To? |
| 98 | if (detail::const_check(F::digits > T::digits) && |
| 99 | from > static_cast<From>(detail::max_value<To>())) { |
| 100 | ec = 1; |
| 101 | return {}; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | if (detail::const_check(!F::is_signed && T::is_signed && |
| 106 | F::digits >= T::digits) && |
| 107 | from > static_cast<From>(detail::max_value<To>())) { |
| 108 | ec = 1; |
| 109 | return {}; |
| 110 | } |
| 111 | return static_cast<To>(from); // Lossless conversion. |
| 112 | } |
| 113 | |
| 114 | template <typename To, typename From, |
| 115 | FMT_ENABLE_IF(std::is_same<From, To>::value)> |
| 116 | FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) { |
| 117 | ec = 0; |
| 118 | return from; |
| 119 | } // function |
| 120 | |
| 121 | // clang-format off |
| 122 | /** |
| 123 | * converts From to To if possible, otherwise ec is set. |
| 124 | * |
| 125 | * input | output |
| 126 | * ---------------------------------|--------------- |
| 127 | * NaN | NaN |
| 128 | * Inf | Inf |
| 129 | * normal, fits in output | converted (possibly lossy) |
| 130 | * normal, does not fit in output | ec is set |
| 131 | * subnormal | best effort |
| 132 | * -Inf | -Inf |
| 133 | */ |
| 134 | // clang-format on |
| 135 | template <typename To, typename From, |
| 136 | FMT_ENABLE_IF(!std::is_same<From, To>::value)> |
| 137 | FMT_CONSTEXPR To safe_float_conversion(const From from, int& ec) { |
| 138 | ec = 0; |
| 139 | using T = std::numeric_limits<To>; |
| 140 | static_assert(std::is_floating_point<From>::value, "From must be floating"); |
| 141 | static_assert(std::is_floating_point<To>::value, "To must be floating"); |
| 142 | |
| 143 | // catch the only happy case |
| 144 | if (std::isfinite(from)) { |
| 145 | if (from >= T::lowest() && from <= (T::max)()) { |
| 146 | return static_cast<To>(from); |
| 147 | } |
| 148 | // not within range. |
| 149 | ec = 1; |
| 150 | return {}; |
| 151 | } |
| 152 | |
| 153 | // nan and inf will be preserved |
| 154 | return static_cast<To>(from); |
| 155 | } // function |
| 156 | |
| 157 | template <typename To, typename From, |
| 158 | FMT_ENABLE_IF(std::is_same<From, To>::value)> |
| 159 | FMT_CONSTEXPR To safe_float_conversion(const From from, int& ec) { |
| 160 | ec = 0; |
| 161 | static_assert(std::is_floating_point<From>::value, "From must be floating"); |
| 162 | return from; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * safe duration cast between integral durations |
| 167 | */ |
| 168 | template <typename To, typename FromRep, typename FromPeriod, |
| 169 | FMT_ENABLE_IF(std::is_integral<FromRep>::value), |
| 170 | FMT_ENABLE_IF(std::is_integral<typename To::rep>::value)> |
| 171 | To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from, |
| 172 | int& ec) { |
| 173 | using From = std::chrono::duration<FromRep, FromPeriod>; |
| 174 | ec = 0; |
| 175 | // the basic idea is that we need to convert from count() in the from type |
| 176 | // to count() in the To type, by multiplying it with this: |
| 177 | struct Factor |
| 178 | : std::ratio_divide<typename From::period, typename To::period> {}; |
| 179 | |
| 180 | static_assert(Factor::num > 0, "num must be positive"); |
| 181 | static_assert(Factor::den > 0, "den must be positive"); |
| 182 | |
| 183 | // the conversion is like this: multiply from.count() with Factor::num |
| 184 | // /Factor::den and convert it to To::rep, all this without |
| 185 | // overflow/underflow. let's start by finding a suitable type that can hold |
| 186 | // both To, From and Factor::num |
| 187 | using IntermediateRep = |
| 188 | typename std::common_type<typename From::rep, typename To::rep, |
| 189 | decltype(Factor::num)>::type; |
| 190 | |
| 191 | // safe conversion to IntermediateRep |
| 192 | IntermediateRep count = |
| 193 | lossless_integral_conversion<IntermediateRep>(from.count(), ec); |
| 194 | if (ec) return {}; |
| 195 | // multiply with Factor::num without overflow or underflow |
| 196 | if (detail::const_check(Factor::num != 1)) { |
| 197 | const auto max1 = detail::max_value<IntermediateRep>() / Factor::num; |
| 198 | if (count > max1) { |
| 199 | ec = 1; |
| 200 | return {}; |
| 201 | } |
| 202 | const auto min1 = |
| 203 | (std::numeric_limits<IntermediateRep>::min)() / Factor::num; |
| 204 | if (count < min1) { |
| 205 | ec = 1; |
| 206 | return {}; |
| 207 | } |
| 208 | count *= Factor::num; |
| 209 | } |
| 210 | |
| 211 | if (detail::const_check(Factor::den != 1)) count /= Factor::den; |
| 212 | auto tocount = lossless_integral_conversion<typename To::rep>(count, ec); |
| 213 | return ec ? To() : To(tocount); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * safe duration_cast between floating point durations |
| 218 | */ |
| 219 | template <typename To, typename FromRep, typename FromPeriod, |
| 220 | FMT_ENABLE_IF(std::is_floating_point<FromRep>::value), |
| 221 | FMT_ENABLE_IF(std::is_floating_point<typename To::rep>::value)> |
| 222 | To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from, |
| 223 | int& ec) { |
| 224 | using From = std::chrono::duration<FromRep, FromPeriod>; |
| 225 | ec = 0; |
| 226 | if (std::isnan(from.count())) { |
| 227 | // nan in, gives nan out. easy. |
| 228 | return To{std::numeric_limits<typename To::rep>::quiet_NaN()}; |
| 229 | } |
| 230 | // maybe we should also check if from is denormal, and decide what to do about |
| 231 | // it. |
| 232 | |
| 233 | // +-inf should be preserved. |
| 234 | if (std::isinf(from.count())) { |
| 235 | return To{from.count()}; |
| 236 | } |
| 237 | |
| 238 | // the basic idea is that we need to convert from count() in the from type |
| 239 | // to count() in the To type, by multiplying it with this: |
| 240 | struct Factor |
| 241 | : std::ratio_divide<typename From::period, typename To::period> {}; |
| 242 | |
| 243 | static_assert(Factor::num > 0, "num must be positive"); |
| 244 | static_assert(Factor::den > 0, "den must be positive"); |
| 245 | |
| 246 | // the conversion is like this: multiply from.count() with Factor::num |
| 247 | // /Factor::den and convert it to To::rep, all this without |
| 248 | // overflow/underflow. let's start by finding a suitable type that can hold |
| 249 | // both To, From and Factor::num |
| 250 | using IntermediateRep = |
| 251 | typename std::common_type<typename From::rep, typename To::rep, |
| 252 | decltype(Factor::num)>::type; |
| 253 | |
| 254 | // force conversion of From::rep -> IntermediateRep to be safe, |
| 255 | // even if it will never happen be narrowing in this context. |
| 256 | IntermediateRep count = |
| 257 | safe_float_conversion<IntermediateRep>(from.count(), ec); |
| 258 | if (ec) { |
| 259 | return {}; |
| 260 | } |
| 261 | |
| 262 | // multiply with Factor::num without overflow or underflow |
| 263 | if (detail::const_check(Factor::num != 1)) { |
| 264 | constexpr auto max1 = detail::max_value<IntermediateRep>() / |
| 265 | static_cast<IntermediateRep>(Factor::num); |
| 266 | if (count > max1) { |
| 267 | ec = 1; |
| 268 | return {}; |
| 269 | } |
| 270 | constexpr auto min1 = std::numeric_limits<IntermediateRep>::lowest() / |
| 271 | static_cast<IntermediateRep>(Factor::num); |
| 272 | if (count < min1) { |
| 273 | ec = 1; |
| 274 | return {}; |
| 275 | } |
| 276 | count *= static_cast<IntermediateRep>(Factor::num); |
| 277 | } |
| 278 | |
| 279 | // this can't go wrong, right? den>0 is checked earlier. |
| 280 | if (detail::const_check(Factor::den != 1)) { |
| 281 | using common_t = typename std::common_type<IntermediateRep, intmax_t>::type; |
| 282 | count /= static_cast<common_t>(Factor::den); |
| 283 | } |
| 284 | |
| 285 | // convert to the to type, safely |
| 286 | using ToRep = typename To::rep; |
| 287 | |
| 288 | const ToRep tocount = safe_float_conversion<ToRep>(count, ec); |
| 289 | if (ec) { |
| 290 | return {}; |
| 291 | } |
| 292 | return To{tocount}; |
| 293 | } |
| 294 | } // namespace safe_duration_cast |
| 295 | #endif |
| 296 | |
| 297 | // Prevents expansion of a preceding token as a function-style macro. |
| 298 | // Usage: f FMT_NOMACRO() |
| 299 | #define FMT_NOMACRO |
| 300 | |
| 301 | namespace detail { |
| 302 | template <typename T = void> struct null {}; |
| 303 | inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); } |
| 304 | inline null<> localtime_s(...) { return null<>(); } |
| 305 | inline null<> gmtime_r(...) { return null<>(); } |
| 306 | inline null<> gmtime_s(...) { return null<>(); } |
| 307 | |
| 308 | inline const std::locale& get_classic_locale() { |
| 309 | static const auto& locale = std::locale::classic(); |
| 310 | return locale; |
| 311 | } |
| 312 | |
| 313 | template <typename CodeUnit> struct codecvt_result { |
| 314 | static constexpr const size_t max_size = 32; |
| 315 | CodeUnit buf[max_size]; |
| 316 | CodeUnit* end; |
| 317 | }; |
| 318 | template <typename CodeUnit> |
| 319 | constexpr const size_t codecvt_result<CodeUnit>::max_size; |
| 320 | |
| 321 | template <typename CodeUnit> |
| 322 | void write_codecvt(codecvt_result<CodeUnit>& out, string_view in_buf, |
| 323 | const std::locale& loc) { |
| 324 | using codecvt = std::codecvt<CodeUnit, char, std::mbstate_t>; |
| 325 | #if FMT_CLANG_VERSION |
| 326 | # pragma clang diagnostic push |
| 327 | # pragma clang diagnostic ignored "-Wdeprecated" |
| 328 | auto& f = std::use_facet<codecvt>(loc); |
| 329 | # pragma clang diagnostic pop |
| 330 | #else |
| 331 | auto& f = std::use_facet<codecvt>(loc); |
| 332 | #endif |
| 333 | auto mb = std::mbstate_t(); |
| 334 | const char* from_next = nullptr; |
| 335 | auto result = f.in(mb, in_buf.begin(), in_buf.end(), from_next, |
| 336 | std::begin(out.buf), std::end(out.buf), out.end); |
| 337 | if (result != std::codecvt_base::ok) |
| 338 | FMT_THROW(format_error("failed to format time")); |
| 339 | } |
| 340 | |
| 341 | template <typename OutputIt> |
| 342 | auto write_encoded_tm_str(OutputIt out, string_view in, const std::locale& loc) |
| 343 | -> OutputIt { |
| 344 | if (detail::is_utf8() && loc != get_classic_locale()) { |
| 345 | // char16_t and char32_t codecvts are broken in MSVC (linkage errors) and |
| 346 | // gcc-4. |
| 347 | #if FMT_MSC_VER != 0 || \ |
| 348 | (defined(__GLIBCXX__) && !defined(_GLIBCXX_USE_DUAL_ABI)) |
| 349 | // The _GLIBCXX_USE_DUAL_ABI macro is always defined in libstdc++ from gcc-5 |
| 350 | // and newer. |
| 351 | using code_unit = wchar_t; |
| 352 | #else |
| 353 | using code_unit = char32_t; |
| 354 | #endif |
| 355 | |
| 356 | using unit_t = codecvt_result<code_unit>; |
| 357 | unit_t unit; |
| 358 | write_codecvt(unit, in, loc); |
| 359 | // In UTF-8 is used one to four one-byte code units. |
| 360 | auto&& buf = basic_memory_buffer<char, unit_t::max_size * 4>(); |
| 361 | for (code_unit* p = unit.buf; p != unit.end; ++p) { |
| 362 | uint32_t c = static_cast<uint32_t>(*p); |
| 363 | if (sizeof(code_unit) == 2 && c >= 0xd800 && c <= 0xdfff) { |
| 364 | // surrogate pair |
| 365 | ++p; |
| 366 | if (p == unit.end || (c & 0xfc00) != 0xd800 || |
| 367 | (*p & 0xfc00) != 0xdc00) { |
| 368 | FMT_THROW(format_error("failed to format time")); |
| 369 | } |
| 370 | c = (c << 10) + static_cast<uint32_t>(*p) - 0x35fdc00; |
| 371 | } |
| 372 | if (c < 0x80) { |
| 373 | buf.push_back(static_cast<char>(c)); |
| 374 | } else if (c < 0x800) { |
| 375 | buf.push_back(static_cast<char>(0xc0 | (c >> 6))); |
| 376 | buf.push_back(static_cast<char>(0x80 | (c & 0x3f))); |
| 377 | } else if ((c >= 0x800 && c <= 0xd7ff) || (c >= 0xe000 && c <= 0xffff)) { |
| 378 | buf.push_back(static_cast<char>(0xe0 | (c >> 12))); |
| 379 | buf.push_back(static_cast<char>(0x80 | ((c & 0xfff) >> 6))); |
| 380 | buf.push_back(static_cast<char>(0x80 | (c & 0x3f))); |
| 381 | } else if (c >= 0x10000 && c <= 0x10ffff) { |
| 382 | buf.push_back(static_cast<char>(0xf0 | (c >> 18))); |
| 383 | buf.push_back(static_cast<char>(0x80 | ((c & 0x3ffff) >> 12))); |
| 384 | buf.push_back(static_cast<char>(0x80 | ((c & 0xfff) >> 6))); |
| 385 | buf.push_back(static_cast<char>(0x80 | (c & 0x3f))); |
| 386 | } else { |
| 387 | FMT_THROW(format_error("failed to format time")); |
| 388 | } |
| 389 | } |
| 390 | return copy_str<char>(buf.data(), buf.data() + buf.size(), out); |
| 391 | } |
| 392 | return copy_str<char>(in.data(), in.data() + in.size(), out); |
| 393 | } |
| 394 | |
| 395 | template <typename Char, typename OutputIt, |
| 396 | FMT_ENABLE_IF(!std::is_same<Char, char>::value)> |
| 397 | auto write_tm_str(OutputIt out, string_view sv, const std::locale& loc) |
| 398 | -> OutputIt { |
| 399 | codecvt_result<Char> unit; |
| 400 | write_codecvt(unit, sv, loc); |
| 401 | return copy_str<Char>(unit.buf, unit.end, out); |
| 402 | } |
| 403 | |
| 404 | template <typename Char, typename OutputIt, |
| 405 | FMT_ENABLE_IF(std::is_same<Char, char>::value)> |
| 406 | auto write_tm_str(OutputIt out, string_view sv, const std::locale& loc) |
| 407 | -> OutputIt { |
| 408 | return write_encoded_tm_str(out, sv, loc); |
| 409 | } |
| 410 | |
| 411 | template <typename Char> |
| 412 | inline void do_write(buffer<Char>& buf, const std::tm& time, |
| 413 | const std::locale& loc, char format, char modifier) { |
| 414 | auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf); |
| 415 | auto&& os = std::basic_ostream<Char>(&format_buf); |
| 416 | os.imbue(loc); |
| 417 | using iterator = std::ostreambuf_iterator<Char>; |
| 418 | const auto& facet = std::use_facet<std::time_put<Char, iterator>>(loc); |
| 419 | auto end = facet.put(os, os, Char(' '), &time, format, modifier); |
| 420 | if (end.failed()) FMT_THROW(format_error("failed to format time")); |
| 421 | } |
| 422 | |
| 423 | template <typename Char, typename OutputIt, |
| 424 | FMT_ENABLE_IF(!std::is_same<Char, char>::value)> |
| 425 | auto write(OutputIt out, const std::tm& time, const std::locale& loc, |
| 426 | char format, char modifier = 0) -> OutputIt { |
| 427 | auto&& buf = get_buffer<Char>(out); |
| 428 | do_write<Char>(buf, time, loc, format, modifier); |
| 429 | return buf.out(); |
| 430 | } |
| 431 | |
| 432 | template <typename Char, typename OutputIt, |
| 433 | FMT_ENABLE_IF(std::is_same<Char, char>::value)> |
| 434 | auto write(OutputIt out, const std::tm& time, const std::locale& loc, |
| 435 | char format, char modifier = 0) -> OutputIt { |
| 436 | auto&& buf = basic_memory_buffer<Char>(); |
| 437 | do_write<char>(buf, time, loc, format, modifier); |
| 438 | return write_encoded_tm_str(out, string_view(buf.data(), buf.size()), loc); |
| 439 | } |
| 440 | |
| 441 | } // namespace detail |
| 442 | |
| 443 | FMT_MODULE_EXPORT_BEGIN |
| 444 | |
| 445 | /** |
| 446 | Converts given time since epoch as ``std::time_t`` value into calendar time, |
| 447 | expressed in local time. Unlike ``std::localtime``, this function is |
| 448 | thread-safe on most platforms. |
| 449 | */ |
| 450 | inline std::tm localtime(std::time_t time) { |
| 451 | struct dispatcher { |
| 452 | std::time_t time_; |
| 453 | std::tm tm_; |
| 454 | |
| 455 | dispatcher(std::time_t t) : time_(t) {} |
| 456 | |
| 457 | bool run() { |
| 458 | using namespace fmt::detail; |
| 459 | return handle(localtime_r(&time_, &tm_)); |
| 460 | } |
| 461 | |
| 462 | bool handle(std::tm* tm) { return tm != nullptr; } |
| 463 | |
| 464 | bool handle(detail::null<>) { |
| 465 | using namespace fmt::detail; |
| 466 | return fallback(localtime_s(&tm_, &time_)); |
| 467 | } |
| 468 | |
| 469 | bool fallback(int res) { return res == 0; } |
| 470 | |
| 471 | #if !FMT_MSC_VER |
| 472 | bool fallback(detail::null<>) { |
| 473 | using namespace fmt::detail; |
| 474 | std::tm* tm = std::localtime(&time_); |
| 475 | if (tm) tm_ = *tm; |
| 476 | return tm != nullptr; |
| 477 | } |
| 478 | #endif |
| 479 | }; |
| 480 | dispatcher lt(time); |
| 481 | // Too big time values may be unsupported. |
| 482 | if (!lt.run()) FMT_THROW(format_error("time_t value out of range")); |
| 483 | return lt.tm_; |
| 484 | } |
| 485 | |
| 486 | inline std::tm localtime( |
| 487 | std::chrono::time_point<std::chrono::system_clock> time_point) { |
| 488 | return localtime(std::chrono::system_clock::to_time_t(time_point)); |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | Converts given time since epoch as ``std::time_t`` value into calendar time, |
| 493 | expressed in Coordinated Universal Time (UTC). Unlike ``std::gmtime``, this |
| 494 | function is thread-safe on most platforms. |
| 495 | */ |
| 496 | inline std::tm gmtime(std::time_t time) { |
| 497 | struct dispatcher { |
| 498 | std::time_t time_; |
| 499 | std::tm tm_; |
| 500 | |
| 501 | dispatcher(std::time_t t) : time_(t) {} |
| 502 | |
| 503 | bool run() { |
| 504 | using namespace fmt::detail; |
| 505 | return handle(gmtime_r(&time_, &tm_)); |
| 506 | } |
| 507 | |
| 508 | bool handle(std::tm* tm) { return tm != nullptr; } |
| 509 | |
| 510 | bool handle(detail::null<>) { |
| 511 | using namespace fmt::detail; |
| 512 | return fallback(gmtime_s(&tm_, &time_)); |
| 513 | } |
| 514 | |
| 515 | bool fallback(int res) { return res == 0; } |
| 516 | |
| 517 | #if !FMT_MSC_VER |
| 518 | bool fallback(detail::null<>) { |
| 519 | std::tm* tm = std::gmtime(&time_); |
| 520 | if (tm) tm_ = *tm; |
| 521 | return tm != nullptr; |
| 522 | } |
| 523 | #endif |
| 524 | }; |
| 525 | dispatcher gt(time); |
| 526 | // Too big time values may be unsupported. |
| 527 | if (!gt.run()) FMT_THROW(format_error("time_t value out of range")); |
| 528 | return gt.tm_; |
| 529 | } |
| 530 | |
| 531 | inline std::tm gmtime( |
| 532 | std::chrono::time_point<std::chrono::system_clock> time_point) { |
| 533 | return gmtime(std::chrono::system_clock::to_time_t(time_point)); |
| 534 | } |
| 535 | |
| 536 | FMT_BEGIN_DETAIL_NAMESPACE |
| 537 | |
| 538 | // Writes two-digit numbers a, b and c separated by sep to buf. |
| 539 | // The method by Pavel Novikov based on |
| 540 | // https://johnnylee-sde.github.io/Fast-unsigned-integer-to-time-string/. |
| 541 | inline void write_digit2_separated(char* buf, unsigned a, unsigned b, |
| 542 | unsigned c, char sep) { |
| 543 | unsigned long long digits = |
| 544 | a | (b << 24) | (static_cast<unsigned long long>(c) << 48); |
| 545 | // Convert each value to BCD. |
| 546 | // We have x = a * 10 + b and we want to convert it to BCD y = a * 16 + b. |
| 547 | // The difference is |
| 548 | // y - x = a * 6 |
| 549 | // a can be found from x: |
| 550 | // a = floor(x / 10) |
| 551 | // then |
| 552 | // y = x + a * 6 = x + floor(x / 10) * 6 |
| 553 | // floor(x / 10) is (x * 205) >> 11 (needs 16 bits). |
| 554 | digits += (((digits * 205) >> 11) & 0x000f00000f00000f) * 6; |
| 555 | // Put low nibbles to high bytes and high nibbles to low bytes. |
| 556 | digits = ((digits & 0x00f00000f00000f0) >> 4) | |
| 557 | ((digits & 0x000f00000f00000f) << 8); |
| 558 | auto usep = static_cast<unsigned long long>(sep); |
| 559 | // Add ASCII '0' to each digit byte and insert separators. |
| 560 | digits |= 0x3030003030003030 | (usep << 16) | (usep << 40); |
| 561 | |
| 562 | constexpr const size_t len = 8; |
| 563 | if (const_check(is_big_endian())) { |
| 564 | char tmp[len]; |
| 565 | memcpy(tmp, &digits, len); |
| 566 | std::reverse_copy(tmp, tmp + len, buf); |
| 567 | } else { |
| 568 | memcpy(buf, &digits, len); |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | template <typename Period> FMT_CONSTEXPR inline const char* get_units() { |
| 573 | if (std::is_same<Period, std::atto>::value) return "as"; |
| 574 | if (std::is_same<Period, std::femto>::value) return "fs"; |
| 575 | if (std::is_same<Period, std::pico>::value) return "ps"; |
| 576 | if (std::is_same<Period, std::nano>::value) return "ns"; |
| 577 | if (std::is_same<Period, std::micro>::value) return "µs"; |
| 578 | if (std::is_same<Period, std::milli>::value) return "ms"; |
| 579 | if (std::is_same<Period, std::centi>::value) return "cs"; |
| 580 | if (std::is_same<Period, std::deci>::value) return "ds"; |
| 581 | if (std::is_same<Period, std::ratio<1>>::value) return "s"; |
| 582 | if (std::is_same<Period, std::deca>::value) return "das"; |
| 583 | if (std::is_same<Period, std::hecto>::value) return "hs"; |
| 584 | if (std::is_same<Period, std::kilo>::value) return "ks"; |
| 585 | if (std::is_same<Period, std::mega>::value) return "Ms"; |
| 586 | if (std::is_same<Period, std::giga>::value) return "Gs"; |
| 587 | if (std::is_same<Period, std::tera>::value) return "Ts"; |
| 588 | if (std::is_same<Period, std::peta>::value) return "Ps"; |
| 589 | if (std::is_same<Period, std::exa>::value) return "Es"; |
| 590 | if (std::is_same<Period, std::ratio<60>>::value) return "m"; |
| 591 | if (std::is_same<Period, std::ratio<3600>>::value) return "h"; |
| 592 | return nullptr; |
| 593 | } |
| 594 | |
| 595 | enum class numeric_system { |
| 596 | standard, |
| 597 | // Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale. |
| 598 | alternative |
| 599 | }; |
| 600 | |
| 601 | // Parses a put_time-like format string and invokes handler actions. |
| 602 | template <typename Char, typename Handler> |
| 603 | FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin, |
| 604 | const Char* end, |
| 605 | Handler&& handler) { |
| 606 | auto ptr = begin; |
| 607 | while (ptr != end) { |
| 608 | auto c = *ptr; |
| 609 | if (c == '}') break; |
| 610 | if (c != '%') { |
| 611 | ++ptr; |
| 612 | continue; |
| 613 | } |
| 614 | if (begin != ptr) handler.on_text(begin, ptr); |
| 615 | ++ptr; // consume '%' |
| 616 | if (ptr == end) FMT_THROW(format_error("invalid format")); |
| 617 | c = *ptr++; |
| 618 | switch (c) { |
| 619 | case '%': |
| 620 | handler.on_text(ptr - 1, ptr); |
| 621 | break; |
| 622 | case 'n': { |
| 623 | const Char newline[] = {'\n'}; |
| 624 | handler.on_text(newline, newline + 1); |
| 625 | break; |
| 626 | } |
| 627 | case 't': { |
| 628 | const Char tab[] = {'\t'}; |
| 629 | handler.on_text(tab, tab + 1); |
| 630 | break; |
| 631 | } |
| 632 | // Year: |
| 633 | case 'Y': |
| 634 | handler.on_year(numeric_system::standard); |
| 635 | break; |
| 636 | case 'y': |
| 637 | handler.on_short_year(numeric_system::standard); |
| 638 | break; |
| 639 | case 'C': |
| 640 | handler.on_century(numeric_system::standard); |
| 641 | break; |
| 642 | case 'G': |
| 643 | handler.on_iso_week_based_year(); |
| 644 | break; |
| 645 | case 'g': |
| 646 | handler.on_iso_week_based_short_year(); |
| 647 | break; |
| 648 | // Day of the week: |
| 649 | case 'a': |
| 650 | handler.on_abbr_weekday(); |
| 651 | break; |
| 652 | case 'A': |
| 653 | handler.on_full_weekday(); |
| 654 | break; |
| 655 | case 'w': |
| 656 | handler.on_dec0_weekday(numeric_system::standard); |
| 657 | break; |
| 658 | case 'u': |
| 659 | handler.on_dec1_weekday(numeric_system::standard); |
| 660 | break; |
| 661 | // Month: |
| 662 | case 'b': |
| 663 | case 'h': |
| 664 | handler.on_abbr_month(); |
| 665 | break; |
| 666 | case 'B': |
| 667 | handler.on_full_month(); |
| 668 | break; |
| 669 | case 'm': |
| 670 | handler.on_dec_month(numeric_system::standard); |
| 671 | break; |
| 672 | // Day of the year/month: |
| 673 | case 'U': |
| 674 | handler.on_dec0_week_of_year(numeric_system::standard); |
| 675 | break; |
| 676 | case 'W': |
| 677 | handler.on_dec1_week_of_year(numeric_system::standard); |
| 678 | break; |
| 679 | case 'V': |
| 680 | handler.on_iso_week_of_year(numeric_system::standard); |
| 681 | break; |
| 682 | case 'j': |
| 683 | handler.on_day_of_year(); |
| 684 | break; |
| 685 | case 'd': |
| 686 | handler.on_day_of_month(numeric_system::standard); |
| 687 | break; |
| 688 | case 'e': |
| 689 | handler.on_day_of_month_space(numeric_system::standard); |
| 690 | break; |
| 691 | // Hour, minute, second: |
| 692 | case 'H': |
| 693 | handler.on_24_hour(numeric_system::standard); |
| 694 | break; |
| 695 | case 'I': |
| 696 | handler.on_12_hour(numeric_system::standard); |
| 697 | break; |
| 698 | case 'M': |
| 699 | handler.on_minute(numeric_system::standard); |
| 700 | break; |
| 701 | case 'S': |
| 702 | handler.on_second(numeric_system::standard); |
| 703 | break; |
| 704 | // Other: |
| 705 | case 'c': |
| 706 | handler.on_datetime(numeric_system::standard); |
| 707 | break; |
| 708 | case 'x': |
| 709 | handler.on_loc_date(numeric_system::standard); |
| 710 | break; |
| 711 | case 'X': |
| 712 | handler.on_loc_time(numeric_system::standard); |
| 713 | break; |
| 714 | case 'D': |
| 715 | handler.on_us_date(); |
| 716 | break; |
| 717 | case 'F': |
| 718 | handler.on_iso_date(); |
| 719 | break; |
| 720 | case 'r': |
| 721 | handler.on_12_hour_time(); |
| 722 | break; |
| 723 | case 'R': |
| 724 | handler.on_24_hour_time(); |
| 725 | break; |
| 726 | case 'T': |
| 727 | handler.on_iso_time(); |
| 728 | break; |
| 729 | case 'p': |
| 730 | handler.on_am_pm(); |
| 731 | break; |
| 732 | case 'Q': |
| 733 | handler.on_duration_value(); |
| 734 | break; |
| 735 | case 'q': |
| 736 | handler.on_duration_unit(); |
| 737 | break; |
| 738 | case 'z': |
| 739 | handler.on_utc_offset(); |
| 740 | break; |
| 741 | case 'Z': |
| 742 | handler.on_tz_name(); |
| 743 | break; |
| 744 | // Alternative representation: |
| 745 | case 'E': { |
| 746 | if (ptr == end) FMT_THROW(format_error("invalid format")); |
| 747 | c = *ptr++; |
| 748 | switch (c) { |
| 749 | case 'Y': |
| 750 | handler.on_year(numeric_system::alternative); |
| 751 | break; |
| 752 | case 'y': |
| 753 | handler.on_offset_year(); |
| 754 | break; |
| 755 | case 'C': |
| 756 | handler.on_century(numeric_system::alternative); |
| 757 | break; |
| 758 | case 'c': |
| 759 | handler.on_datetime(numeric_system::alternative); |
| 760 | break; |
| 761 | case 'x': |
| 762 | handler.on_loc_date(numeric_system::alternative); |
| 763 | break; |
| 764 | case 'X': |
| 765 | handler.on_loc_time(numeric_system::alternative); |
| 766 | break; |
| 767 | default: |
| 768 | FMT_THROW(format_error("invalid format")); |
| 769 | } |
| 770 | break; |
| 771 | } |
| 772 | case 'O': |
| 773 | if (ptr == end) FMT_THROW(format_error("invalid format")); |
| 774 | c = *ptr++; |
| 775 | switch (c) { |
| 776 | case 'y': |
| 777 | handler.on_short_year(numeric_system::alternative); |
| 778 | break; |
| 779 | case 'm': |
| 780 | handler.on_dec_month(numeric_system::alternative); |
| 781 | break; |
| 782 | case 'U': |
| 783 | handler.on_dec0_week_of_year(numeric_system::alternative); |
| 784 | break; |
| 785 | case 'W': |
| 786 | handler.on_dec1_week_of_year(numeric_system::alternative); |
| 787 | break; |
| 788 | case 'V': |
| 789 | handler.on_iso_week_of_year(numeric_system::alternative); |
| 790 | break; |
| 791 | case 'd': |
| 792 | handler.on_day_of_month(numeric_system::alternative); |
| 793 | break; |
| 794 | case 'e': |
| 795 | handler.on_day_of_month_space(numeric_system::alternative); |
| 796 | break; |
| 797 | case 'w': |
| 798 | handler.on_dec0_weekday(numeric_system::alternative); |
| 799 | break; |
| 800 | case 'u': |
| 801 | handler.on_dec1_weekday(numeric_system::alternative); |
| 802 | break; |
| 803 | case 'H': |
| 804 | handler.on_24_hour(numeric_system::alternative); |
| 805 | break; |
| 806 | case 'I': |
| 807 | handler.on_12_hour(numeric_system::alternative); |
| 808 | break; |
| 809 | case 'M': |
| 810 | handler.on_minute(numeric_system::alternative); |
| 811 | break; |
| 812 | case 'S': |
| 813 | handler.on_second(numeric_system::alternative); |
| 814 | break; |
| 815 | default: |
| 816 | FMT_THROW(format_error("invalid format")); |
| 817 | } |
| 818 | break; |
| 819 | default: |
| 820 | FMT_THROW(format_error("invalid format")); |
| 821 | } |
| 822 | begin = ptr; |
| 823 | } |
| 824 | if (begin != ptr) handler.on_text(begin, ptr); |
| 825 | return ptr; |
| 826 | } |
| 827 | |
| 828 | template <typename Derived> struct null_chrono_spec_handler { |
| 829 | FMT_CONSTEXPR void unsupported() { |
| 830 | static_cast<Derived*>(this)->unsupported(); |
| 831 | } |
| 832 | FMT_CONSTEXPR void on_year(numeric_system) { unsupported(); } |
| 833 | FMT_CONSTEXPR void on_short_year(numeric_system) { unsupported(); } |
| 834 | FMT_CONSTEXPR void on_offset_year() { unsupported(); } |
| 835 | FMT_CONSTEXPR void on_century(numeric_system) { unsupported(); } |
| 836 | FMT_CONSTEXPR void on_iso_week_based_year() { unsupported(); } |
| 837 | FMT_CONSTEXPR void on_iso_week_based_short_year() { unsupported(); } |
| 838 | FMT_CONSTEXPR void on_abbr_weekday() { unsupported(); } |
| 839 | FMT_CONSTEXPR void on_full_weekday() { unsupported(); } |
| 840 | FMT_CONSTEXPR void on_dec0_weekday(numeric_system) { unsupported(); } |
| 841 | FMT_CONSTEXPR void on_dec1_weekday(numeric_system) { unsupported(); } |
| 842 | FMT_CONSTEXPR void on_abbr_month() { unsupported(); } |
| 843 | FMT_CONSTEXPR void on_full_month() { unsupported(); } |
| 844 | FMT_CONSTEXPR void on_dec_month(numeric_system) { unsupported(); } |
| 845 | FMT_CONSTEXPR void on_dec0_week_of_year(numeric_system) { unsupported(); } |
| 846 | FMT_CONSTEXPR void on_dec1_week_of_year(numeric_system) { unsupported(); } |
| 847 | FMT_CONSTEXPR void on_iso_week_of_year(numeric_system) { unsupported(); } |
| 848 | FMT_CONSTEXPR void on_day_of_year() { unsupported(); } |
| 849 | FMT_CONSTEXPR void on_day_of_month(numeric_system) { unsupported(); } |
| 850 | FMT_CONSTEXPR void on_day_of_month_space(numeric_system) { unsupported(); } |
| 851 | FMT_CONSTEXPR void on_24_hour(numeric_system) { unsupported(); } |
| 852 | FMT_CONSTEXPR void on_12_hour(numeric_system) { unsupported(); } |
| 853 | FMT_CONSTEXPR void on_minute(numeric_system) { unsupported(); } |
| 854 | FMT_CONSTEXPR void on_second(numeric_system) { unsupported(); } |
| 855 | FMT_CONSTEXPR void on_datetime(numeric_system) { unsupported(); } |
| 856 | FMT_CONSTEXPR void on_loc_date(numeric_system) { unsupported(); } |
| 857 | FMT_CONSTEXPR void on_loc_time(numeric_system) { unsupported(); } |
| 858 | FMT_CONSTEXPR void on_us_date() { unsupported(); } |
| 859 | FMT_CONSTEXPR void on_iso_date() { unsupported(); } |
| 860 | FMT_CONSTEXPR void on_12_hour_time() { unsupported(); } |
| 861 | FMT_CONSTEXPR void on_24_hour_time() { unsupported(); } |
| 862 | FMT_CONSTEXPR void on_iso_time() { unsupported(); } |
| 863 | FMT_CONSTEXPR void on_am_pm() { unsupported(); } |
| 864 | FMT_CONSTEXPR void on_duration_value() { unsupported(); } |
| 865 | FMT_CONSTEXPR void on_duration_unit() { unsupported(); } |
| 866 | FMT_CONSTEXPR void on_utc_offset() { unsupported(); } |
| 867 | FMT_CONSTEXPR void on_tz_name() { unsupported(); } |
| 868 | }; |
| 869 | |
| 870 | struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> { |
| 871 | FMT_NORETURN void unsupported() { FMT_THROW(format_error("no format")); } |
| 872 | |
| 873 | template <typename Char> |
| 874 | FMT_CONSTEXPR void on_text(const Char*, const Char*) {} |
| 875 | FMT_CONSTEXPR void on_year(numeric_system) {} |
| 876 | FMT_CONSTEXPR void on_short_year(numeric_system) {} |
| 877 | FMT_CONSTEXPR void on_offset_year() {} |
| 878 | FMT_CONSTEXPR void on_century(numeric_system) {} |
| 879 | FMT_CONSTEXPR void on_iso_week_based_year() {} |
| 880 | FMT_CONSTEXPR void on_iso_week_based_short_year() {} |
| 881 | FMT_CONSTEXPR void on_abbr_weekday() {} |
| 882 | FMT_CONSTEXPR void on_full_weekday() {} |
| 883 | FMT_CONSTEXPR void on_dec0_weekday(numeric_system) {} |
| 884 | FMT_CONSTEXPR void on_dec1_weekday(numeric_system) {} |
| 885 | FMT_CONSTEXPR void on_abbr_month() {} |
| 886 | FMT_CONSTEXPR void on_full_month() {} |
| 887 | FMT_CONSTEXPR void on_dec_month(numeric_system) {} |
| 888 | FMT_CONSTEXPR void on_dec0_week_of_year(numeric_system) {} |
| 889 | FMT_CONSTEXPR void on_dec1_week_of_year(numeric_system) {} |
| 890 | FMT_CONSTEXPR void on_iso_week_of_year(numeric_system) {} |
| 891 | FMT_CONSTEXPR void on_day_of_year() {} |
| 892 | FMT_CONSTEXPR void on_day_of_month(numeric_system) {} |
| 893 | FMT_CONSTEXPR void on_day_of_month_space(numeric_system) {} |
| 894 | FMT_CONSTEXPR void on_24_hour(numeric_system) {} |
| 895 | FMT_CONSTEXPR void on_12_hour(numeric_system) {} |
| 896 | FMT_CONSTEXPR void on_minute(numeric_system) {} |
| 897 | FMT_CONSTEXPR void on_second(numeric_system) {} |
| 898 | FMT_CONSTEXPR void on_datetime(numeric_system) {} |
| 899 | FMT_CONSTEXPR void on_loc_date(numeric_system) {} |
| 900 | FMT_CONSTEXPR void on_loc_time(numeric_system) {} |
| 901 | FMT_CONSTEXPR void on_us_date() {} |
| 902 | FMT_CONSTEXPR void on_iso_date() {} |
| 903 | FMT_CONSTEXPR void on_12_hour_time() {} |
| 904 | FMT_CONSTEXPR void on_24_hour_time() {} |
| 905 | FMT_CONSTEXPR void on_iso_time() {} |
| 906 | FMT_CONSTEXPR void on_am_pm() {} |
| 907 | FMT_CONSTEXPR void on_utc_offset() {} |
| 908 | FMT_CONSTEXPR void on_tz_name() {} |
| 909 | }; |
| 910 | |
| 911 | inline const char* tm_wday_full_name(int wday) { |
| 912 | static constexpr const char* full_name_list[] = { |
| 913 | "Sunday", "Monday", "Tuesday", "Wednesday", |
| 914 | "Thursday", "Friday", "Saturday"}; |
| 915 | return wday >= 0 && wday <= 6 ? full_name_list[wday] : "?"; |
| 916 | } |
| 917 | inline const char* tm_wday_short_name(int wday) { |
| 918 | static constexpr const char* short_name_list[] = {"Sun", "Mon", "Tue", "Wed", |
| 919 | "Thu", "Fri", "Sat"}; |
| 920 | return wday >= 0 && wday <= 6 ? short_name_list[wday] : "???"; |
| 921 | } |
| 922 | |
| 923 | inline const char* tm_mon_full_name(int mon) { |
| 924 | static constexpr const char* full_name_list[] = { |
| 925 | "January", "February", "March", "April", "May", "June", |
| 926 | "July", "August", "September", "October", "November", "December"}; |
| 927 | return mon >= 0 && mon <= 11 ? full_name_list[mon] : "?"; |
| 928 | } |
| 929 | inline const char* tm_mon_short_name(int mon) { |
| 930 | static constexpr const char* short_name_list[] = { |
| 931 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 932 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", |
| 933 | }; |
| 934 | return mon >= 0 && mon <= 11 ? short_name_list[mon] : "???"; |
| 935 | } |
| 936 | |
| 937 | template <typename T, typename = void> |
| 938 | struct has_member_data_tm_gmtoff : std::false_type {}; |
| 939 | template <typename T> |
| 940 | struct has_member_data_tm_gmtoff<T, void_t<decltype(T::tm_gmtoff)>> |
| 941 | : std::true_type {}; |
| 942 | |
| 943 | template <typename T, typename = void> |
| 944 | struct has_member_data_tm_zone : std::false_type {}; |
| 945 | template <typename T> |
| 946 | struct has_member_data_tm_zone<T, void_t<decltype(T::tm_zone)>> |
| 947 | : std::true_type {}; |
| 948 | |
| 949 | #if FMT_USE_TZSET |
| 950 | inline void tzset_once() { |
| 951 | static bool init = []() -> bool { |
| 952 | _tzset(); |
| 953 | return true; |
| 954 | }(); |
| 955 | ignore_unused(init); |
| 956 | } |
| 957 | #endif |
| 958 | |
| 959 | template <typename OutputIt, typename Char> class tm_writer { |
| 960 | private: |
| 961 | static constexpr int days_per_week = 7; |
| 962 | |
| 963 | const std::locale& loc_; |
| 964 | const bool is_classic_; |
| 965 | OutputIt out_; |
| 966 | const std::tm& tm_; |
| 967 | |
| 968 | auto tm_sec() const noexcept -> int { |
| 969 | FMT_ASSERT(tm_.tm_sec >= 0 && tm_.tm_sec <= 61, ""); |
| 970 | return tm_.tm_sec; |
| 971 | } |
| 972 | auto tm_min() const noexcept -> int { |
| 973 | FMT_ASSERT(tm_.tm_min >= 0 && tm_.tm_min <= 59, ""); |
| 974 | return tm_.tm_min; |
| 975 | } |
| 976 | auto tm_hour() const noexcept -> int { |
| 977 | FMT_ASSERT(tm_.tm_hour >= 0 && tm_.tm_hour <= 23, ""); |
| 978 | return tm_.tm_hour; |
| 979 | } |
| 980 | auto tm_mday() const noexcept -> int { |
| 981 | FMT_ASSERT(tm_.tm_mday >= 1 && tm_.tm_mday <= 31, ""); |
| 982 | return tm_.tm_mday; |
| 983 | } |
| 984 | auto tm_mon() const noexcept -> int { |
| 985 | FMT_ASSERT(tm_.tm_mon >= 0 && tm_.tm_mon <= 11, ""); |
| 986 | return tm_.tm_mon; |
| 987 | } |
| 988 | auto tm_year() const noexcept -> long long { return 1900ll + tm_.tm_year; } |
| 989 | auto tm_wday() const noexcept -> int { |
| 990 | FMT_ASSERT(tm_.tm_wday >= 0 && tm_.tm_wday <= 6, ""); |
| 991 | return tm_.tm_wday; |
| 992 | } |
| 993 | auto tm_yday() const noexcept -> int { |
| 994 | FMT_ASSERT(tm_.tm_yday >= 0 && tm_.tm_yday <= 365, ""); |
| 995 | return tm_.tm_yday; |
| 996 | } |
| 997 | |
| 998 | auto tm_hour12() const noexcept -> int { |
| 999 | const auto h = tm_hour(); |
| 1000 | const auto z = h < 12 ? h : h - 12; |
| 1001 | return z == 0 ? 12 : z; |
| 1002 | } |
| 1003 | |
| 1004 | // POSIX and the C Standard are unclear or inconsistent about what %C and %y |
| 1005 | // do if the year is negative or exceeds 9999. Use the convention that %C |
| 1006 | // concatenated with %y yields the same output as %Y, and that %Y contains at |
| 1007 | // least 4 characters, with more only if necessary. |
| 1008 | auto split_year_lower(long long year) const noexcept -> int { |
| 1009 | auto l = year % 100; |
| 1010 | if (l < 0) l = -l; // l in [0, 99] |
| 1011 | return static_cast<int>(l); |
| 1012 | } |
| 1013 | |
| 1014 | // Algorithm: |
| 1015 | // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_the_week_number_from_a_month_and_day_of_the_month_or_ordinal_date |
| 1016 | auto iso_year_weeks(long long curr_year) const noexcept -> int { |
| 1017 | const auto prev_year = curr_year - 1; |
| 1018 | const auto curr_p = |
| 1019 | (curr_year + curr_year / 4 - curr_year / 100 + curr_year / 400) % |
| 1020 | days_per_week; |
| 1021 | const auto prev_p = |
| 1022 | (prev_year + prev_year / 4 - prev_year / 100 + prev_year / 400) % |
| 1023 | days_per_week; |
| 1024 | return 52 + ((curr_p == 4 || prev_p == 3) ? 1 : 0); |
| 1025 | } |
| 1026 | auto iso_week_num(int tm_yday, int tm_wday) const noexcept -> int { |
| 1027 | return (tm_yday + 11 - (tm_wday == 0 ? days_per_week : tm_wday)) / |
| 1028 | days_per_week; |
| 1029 | } |
| 1030 | auto tm_iso_week_year() const noexcept -> long long { |
| 1031 | const auto year = tm_year(); |
| 1032 | const auto w = iso_week_num(tm_yday(), tm_wday()); |
| 1033 | if (w < 1) return year - 1; |
| 1034 | if (w > iso_year_weeks(year)) return year + 1; |
| 1035 | return year; |
| 1036 | } |
| 1037 | auto tm_iso_week_of_year() const noexcept -> int { |
| 1038 | const auto year = tm_year(); |
| 1039 | const auto w = iso_week_num(tm_yday(), tm_wday()); |
| 1040 | if (w < 1) return iso_year_weeks(year - 1); |
| 1041 | if (w > iso_year_weeks(year)) return 1; |
| 1042 | return w; |
| 1043 | } |
| 1044 | |
| 1045 | void write1(int value) { |
| 1046 | *out_++ = static_cast<char>('0' + to_unsigned(value) % 10); |
| 1047 | } |
| 1048 | void write2(int value) { |
| 1049 | const char* d = digits2(to_unsigned(value) % 100); |
| 1050 | *out_++ = *d++; |
| 1051 | *out_++ = *d; |
| 1052 | } |
| 1053 | |
| 1054 | void write_year_extended(long long year) { |
| 1055 | // At least 4 characters. |
| 1056 | int width = 4; |
| 1057 | if (year < 0) { |
| 1058 | *out_++ = '-'; |
| 1059 | year = 0 - year; |
| 1060 | --width; |
| 1061 | } |
| 1062 | uint32_or_64_or_128_t<long long> n = to_unsigned(year); |
| 1063 | const int num_digits = count_digits(n); |
| 1064 | if (width > num_digits) out_ = std::fill_n(out_, width - num_digits, '0'); |
| 1065 | out_ = format_decimal<Char>(out_, n, num_digits).end; |
| 1066 | } |
| 1067 | void write_year(long long year) { |
| 1068 | if (year >= 0 && year < 10000) { |
| 1069 | write2(static_cast<int>(year / 100)); |
| 1070 | write2(static_cast<int>(year % 100)); |
| 1071 | } else { |
| 1072 | write_year_extended(year); |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | void write_utc_offset(long offset) { |
| 1077 | if (offset < 0) { |
| 1078 | *out_++ = '-'; |
| 1079 | offset = -offset; |
| 1080 | } else { |
| 1081 | *out_++ = '+'; |
| 1082 | } |
| 1083 | offset /= 60; |
| 1084 | write2(static_cast<int>(offset / 60)); |
| 1085 | write2(static_cast<int>(offset % 60)); |
| 1086 | } |
| 1087 | template <typename T, FMT_ENABLE_IF(has_member_data_tm_gmtoff<T>::value)> |
| 1088 | void format_utc_offset_impl(const T& tm) { |
| 1089 | write_utc_offset(tm.tm_gmtoff); |
| 1090 | } |
| 1091 | template <typename T, FMT_ENABLE_IF(!has_member_data_tm_gmtoff<T>::value)> |
| 1092 | void format_utc_offset_impl(const T& tm) { |
| 1093 | #if defined(_WIN32) && defined(_UCRT) |
| 1094 | # if FMT_USE_TZSET |
| 1095 | tzset_once(); |
| 1096 | # endif |
| 1097 | long offset = 0; |
| 1098 | _get_timezone(&offset); |
| 1099 | if (tm.tm_isdst) { |
| 1100 | long dstbias = 0; |
| 1101 | _get_dstbias(&dstbias); |
| 1102 | offset += dstbias; |
| 1103 | } |
| 1104 | write_utc_offset(-offset); |
| 1105 | #else |
| 1106 | ignore_unused(tm); |
| 1107 | format_localized('z'); |
| 1108 | #endif |
| 1109 | } |
| 1110 | |
| 1111 | template <typename T, FMT_ENABLE_IF(has_member_data_tm_zone<T>::value)> |
| 1112 | void format_tz_name_impl(const T& tm) { |
| 1113 | if (is_classic_) |
| 1114 | out_ = write_tm_str<Char>(out_, tm.tm_zone, loc_); |
| 1115 | else |
| 1116 | format_localized('Z'); |
| 1117 | } |
| 1118 | template <typename T, FMT_ENABLE_IF(!has_member_data_tm_zone<T>::value)> |
| 1119 | void format_tz_name_impl(const T&) { |
| 1120 | format_localized('Z'); |
| 1121 | } |
| 1122 | |
| 1123 | void format_localized(char format, char modifier = 0) { |
| 1124 | out_ = write<Char>(out_, tm_, loc_, format, modifier); |
| 1125 | } |
| 1126 | |
| 1127 | public: |
| 1128 | tm_writer(const std::locale& loc, OutputIt out, const std::tm& tm) |
| 1129 | : loc_(loc), |
| 1130 | is_classic_(loc_ == get_classic_locale()), |
| 1131 | out_(out), |
| 1132 | tm_(tm) {} |
| 1133 | |
| 1134 | OutputIt out() const { return out_; } |
| 1135 | |
| 1136 | FMT_CONSTEXPR void on_text(const Char* begin, const Char* end) { |
| 1137 | out_ = copy_str<Char>(begin, end, out_); |
| 1138 | } |
| 1139 | |
| 1140 | void on_abbr_weekday() { |
| 1141 | if (is_classic_) |
| 1142 | out_ = write(out_, tm_wday_short_name(tm_wday())); |
| 1143 | else |
| 1144 | format_localized('a'); |
| 1145 | } |
| 1146 | void on_full_weekday() { |
| 1147 | if (is_classic_) |
| 1148 | out_ = write(out_, tm_wday_full_name(tm_wday())); |
| 1149 | else |
| 1150 | format_localized('A'); |
| 1151 | } |
| 1152 | void on_dec0_weekday(numeric_system ns) { |
| 1153 | if (is_classic_ || ns == numeric_system::standard) return write1(tm_wday()); |
| 1154 | format_localized('w', 'O'); |
| 1155 | } |
| 1156 | void on_dec1_weekday(numeric_system ns) { |
| 1157 | if (is_classic_ || ns == numeric_system::standard) { |
| 1158 | auto wday = tm_wday(); |
| 1159 | write1(wday == 0 ? days_per_week : wday); |
| 1160 | } else { |
| 1161 | format_localized('u', 'O'); |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | void on_abbr_month() { |
| 1166 | if (is_classic_) |
| 1167 | out_ = write(out_, tm_mon_short_name(tm_mon())); |
| 1168 | else |
| 1169 | format_localized('b'); |
| 1170 | } |
| 1171 | void on_full_month() { |
| 1172 | if (is_classic_) |
| 1173 | out_ = write(out_, tm_mon_full_name(tm_mon())); |
| 1174 | else |
| 1175 | format_localized('B'); |
| 1176 | } |
| 1177 | |
| 1178 | void on_datetime(numeric_system ns) { |
| 1179 | if (is_classic_) { |
| 1180 | on_abbr_weekday(); |
| 1181 | *out_++ = ' '; |
| 1182 | on_abbr_month(); |
| 1183 | *out_++ = ' '; |
| 1184 | on_day_of_month_space(numeric_system::standard); |
| 1185 | *out_++ = ' '; |
| 1186 | on_iso_time(); |
| 1187 | *out_++ = ' '; |
| 1188 | on_year(numeric_system::standard); |
| 1189 | } else { |
| 1190 | format_localized('c', ns == numeric_system::standard ? '\0' : 'E'); |
| 1191 | } |
| 1192 | } |
| 1193 | void on_loc_date(numeric_system ns) { |
| 1194 | if (is_classic_) |
| 1195 | on_us_date(); |
| 1196 | else |
| 1197 | format_localized('x', ns == numeric_system::standard ? '\0' : 'E'); |
| 1198 | } |
| 1199 | void on_loc_time(numeric_system ns) { |
| 1200 | if (is_classic_) |
| 1201 | on_iso_time(); |
| 1202 | else |
| 1203 | format_localized('X', ns == numeric_system::standard ? '\0' : 'E'); |
| 1204 | } |
| 1205 | void on_us_date() { |
| 1206 | char buf[8]; |
| 1207 | write_digit2_separated(buf, to_unsigned(tm_mon() + 1), |
| 1208 | to_unsigned(tm_mday()), |
| 1209 | to_unsigned(split_year_lower(tm_year())), '/'); |
| 1210 | out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_); |
| 1211 | } |
| 1212 | void on_iso_date() { |
| 1213 | auto year = tm_year(); |
| 1214 | char buf[10]; |
| 1215 | size_t offset = 0; |
| 1216 | if (year >= 0 && year < 10000) { |
| 1217 | copy2(buf, digits2(to_unsigned(year / 100))); |
| 1218 | } else { |
| 1219 | offset = 4; |
| 1220 | write_year_extended(year); |
| 1221 | year = 0; |
| 1222 | } |
| 1223 | write_digit2_separated(buf + 2, static_cast<unsigned>(year % 100), |
| 1224 | to_unsigned(tm_mon() + 1), to_unsigned(tm_mday()), |
| 1225 | '-'); |
| 1226 | out_ = copy_str<Char>(std::begin(buf) + offset, std::end(buf), out_); |
| 1227 | } |
| 1228 | |
| 1229 | void on_utc_offset() { format_utc_offset_impl(tm_); } |
| 1230 | void on_tz_name() { format_tz_name_impl(tm_); } |
| 1231 | |
| 1232 | void on_year(numeric_system ns) { |
| 1233 | if (is_classic_ || ns == numeric_system::standard) |
| 1234 | return write_year(tm_year()); |
| 1235 | format_localized('Y', 'E'); |
| 1236 | } |
| 1237 | void on_short_year(numeric_system ns) { |
| 1238 | if (is_classic_ || ns == numeric_system::standard) |
| 1239 | return write2(split_year_lower(tm_year())); |
| 1240 | format_localized('y', 'O'); |
| 1241 | } |
| 1242 | void on_offset_year() { |
| 1243 | if (is_classic_) return write2(split_year_lower(tm_year())); |
| 1244 | format_localized('y', 'E'); |
| 1245 | } |
| 1246 | |
| 1247 | void on_century(numeric_system ns) { |
| 1248 | if (is_classic_ || ns == numeric_system::standard) { |
| 1249 | auto year = tm_year(); |
| 1250 | auto upper = year / 100; |
| 1251 | if (year >= -99 && year < 0) { |
| 1252 | // Zero upper on negative year. |
| 1253 | *out_++ = '-'; |
| 1254 | *out_++ = '0'; |
| 1255 | } else if (upper >= 0 && upper < 100) { |
| 1256 | write2(static_cast<int>(upper)); |
| 1257 | } else { |
| 1258 | out_ = write<Char>(out_, upper); |
| 1259 | } |
| 1260 | } else { |
| 1261 | format_localized('C', 'E'); |
| 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | void on_dec_month(numeric_system ns) { |
| 1266 | if (is_classic_ || ns == numeric_system::standard) |
| 1267 | return write2(tm_mon() + 1); |
| 1268 | format_localized('m', 'O'); |
| 1269 | } |
| 1270 | |
| 1271 | void on_dec0_week_of_year(numeric_system ns) { |
| 1272 | if (is_classic_ || ns == numeric_system::standard) |
| 1273 | return write2((tm_yday() + days_per_week - tm_wday()) / days_per_week); |
| 1274 | format_localized('U', 'O'); |
| 1275 | } |
| 1276 | void on_dec1_week_of_year(numeric_system ns) { |
| 1277 | if (is_classic_ || ns == numeric_system::standard) { |
| 1278 | auto wday = tm_wday(); |
| 1279 | write2((tm_yday() + days_per_week - |
| 1280 | (wday == 0 ? (days_per_week - 1) : (wday - 1))) / |
| 1281 | days_per_week); |
| 1282 | } else { |
| 1283 | format_localized('W', 'O'); |
| 1284 | } |
| 1285 | } |
| 1286 | void on_iso_week_of_year(numeric_system ns) { |
| 1287 | if (is_classic_ || ns == numeric_system::standard) |
| 1288 | return write2(tm_iso_week_of_year()); |
| 1289 | format_localized('V', 'O'); |
| 1290 | } |
| 1291 | |
| 1292 | void on_iso_week_based_year() { write_year(tm_iso_week_year()); } |
| 1293 | void on_iso_week_based_short_year() { |
| 1294 | write2(split_year_lower(tm_iso_week_year())); |
| 1295 | } |
| 1296 | |
| 1297 | void on_day_of_year() { |
| 1298 | auto yday = tm_yday() + 1; |
| 1299 | write1(yday / 100); |
| 1300 | write2(yday % 100); |
| 1301 | } |
| 1302 | void on_day_of_month(numeric_system ns) { |
| 1303 | if (is_classic_ || ns == numeric_system::standard) return write2(tm_mday()); |
| 1304 | format_localized('d', 'O'); |
| 1305 | } |
| 1306 | void on_day_of_month_space(numeric_system ns) { |
| 1307 | if (is_classic_ || ns == numeric_system::standard) { |
| 1308 | auto mday = to_unsigned(tm_mday()) % 100; |
| 1309 | const char* d2 = digits2(mday); |
| 1310 | *out_++ = mday < 10 ? ' ' : d2[0]; |
| 1311 | *out_++ = d2[1]; |
| 1312 | } else { |
| 1313 | format_localized('e', 'O'); |
| 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | void on_24_hour(numeric_system ns) { |
| 1318 | if (is_classic_ || ns == numeric_system::standard) return write2(tm_hour()); |
| 1319 | format_localized('H', 'O'); |
| 1320 | } |
| 1321 | void on_12_hour(numeric_system ns) { |
| 1322 | if (is_classic_ || ns == numeric_system::standard) |
| 1323 | return write2(tm_hour12()); |
| 1324 | format_localized('I', 'O'); |
| 1325 | } |
| 1326 | void on_minute(numeric_system ns) { |
| 1327 | if (is_classic_ || ns == numeric_system::standard) return write2(tm_min()); |
| 1328 | format_localized('M', 'O'); |
| 1329 | } |
| 1330 | void on_second(numeric_system ns) { |
| 1331 | if (is_classic_ || ns == numeric_system::standard) return write2(tm_sec()); |
| 1332 | format_localized('S', 'O'); |
| 1333 | } |
| 1334 | |
| 1335 | void on_12_hour_time() { |
| 1336 | if (is_classic_) { |
| 1337 | char buf[8]; |
| 1338 | write_digit2_separated(buf, to_unsigned(tm_hour12()), |
| 1339 | to_unsigned(tm_min()), to_unsigned(tm_sec()), ':'); |
| 1340 | out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_); |
| 1341 | *out_++ = ' '; |
| 1342 | on_am_pm(); |
| 1343 | } else { |
| 1344 | format_localized('r'); |
| 1345 | } |
| 1346 | } |
| 1347 | void on_24_hour_time() { |
| 1348 | write2(tm_hour()); |
| 1349 | *out_++ = ':'; |
| 1350 | write2(tm_min()); |
| 1351 | } |
| 1352 | void on_iso_time() { |
| 1353 | char buf[8]; |
| 1354 | write_digit2_separated(buf, to_unsigned(tm_hour()), to_unsigned(tm_min()), |
| 1355 | to_unsigned(tm_sec()), ':'); |
| 1356 | out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_); |
| 1357 | } |
| 1358 | |
| 1359 | void on_am_pm() { |
| 1360 | if (is_classic_) { |
| 1361 | *out_++ = tm_hour() < 12 ? 'A' : 'P'; |
| 1362 | *out_++ = 'M'; |
| 1363 | } else { |
| 1364 | format_localized('p'); |
| 1365 | } |
| 1366 | } |
| 1367 | |
| 1368 | // These apply to chrono durations but not tm. |
| 1369 | void on_duration_value() {} |
| 1370 | void on_duration_unit() {} |
| 1371 | }; |
| 1372 | |
| 1373 | struct chrono_format_checker : null_chrono_spec_handler<chrono_format_checker> { |
| 1374 | FMT_NORETURN void unsupported() { FMT_THROW(format_error("no date")); } |
| 1375 | |
| 1376 | template <typename Char> |
| 1377 | FMT_CONSTEXPR void on_text(const Char*, const Char*) {} |
| 1378 | FMT_CONSTEXPR void on_24_hour(numeric_system) {} |
| 1379 | FMT_CONSTEXPR void on_12_hour(numeric_system) {} |
| 1380 | FMT_CONSTEXPR void on_minute(numeric_system) {} |
| 1381 | FMT_CONSTEXPR void on_second(numeric_system) {} |
| 1382 | FMT_CONSTEXPR void on_12_hour_time() {} |
| 1383 | FMT_CONSTEXPR void on_24_hour_time() {} |
| 1384 | FMT_CONSTEXPR void on_iso_time() {} |
| 1385 | FMT_CONSTEXPR void on_am_pm() {} |
| 1386 | FMT_CONSTEXPR void on_duration_value() {} |
| 1387 | FMT_CONSTEXPR void on_duration_unit() {} |
| 1388 | }; |
| 1389 | |
| 1390 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 1391 | inline bool isnan(T) { |
| 1392 | return false; |
| 1393 | } |
| 1394 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 1395 | inline bool isnan(T value) { |
| 1396 | return std::isnan(value); |
| 1397 | } |
| 1398 | |
| 1399 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 1400 | inline bool isfinite(T) { |
| 1401 | return true; |
| 1402 | } |
| 1403 | |
| 1404 | // Converts value to Int and checks that it's in the range [0, upper). |
| 1405 | template <typename T, typename Int, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 1406 | inline Int to_nonnegative_int(T value, Int upper) { |
| 1407 | FMT_ASSERT(value >= 0 && to_unsigned(value) <= to_unsigned(upper), |
| 1408 | "invalid value"); |
| 1409 | (void)upper; |
| 1410 | return static_cast<Int>(value); |
| 1411 | } |
| 1412 | template <typename T, typename Int, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 1413 | inline Int to_nonnegative_int(T value, Int upper) { |
| 1414 | if (value < 0 || value > static_cast<T>(upper)) |
| 1415 | FMT_THROW(format_error("invalid value")); |
| 1416 | return static_cast<Int>(value); |
| 1417 | } |
| 1418 | |
| 1419 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 1420 | inline T mod(T x, int y) { |
| 1421 | return x % static_cast<T>(y); |
| 1422 | } |
| 1423 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 1424 | inline T mod(T x, int y) { |
| 1425 | return std::fmod(x, static_cast<T>(y)); |
| 1426 | } |
| 1427 | |
| 1428 | // If T is an integral type, maps T to its unsigned counterpart, otherwise |
| 1429 | // leaves it unchanged (unlike std::make_unsigned). |
| 1430 | template <typename T, bool INTEGRAL = std::is_integral<T>::value> |
| 1431 | struct make_unsigned_or_unchanged { |
| 1432 | using type = T; |
| 1433 | }; |
| 1434 | |
| 1435 | template <typename T> struct make_unsigned_or_unchanged<T, true> { |
| 1436 | using type = typename std::make_unsigned<T>::type; |
| 1437 | }; |
| 1438 | |
| 1439 | #if FMT_SAFE_DURATION_CAST |
| 1440 | // throwing version of safe_duration_cast |
| 1441 | template <typename To, typename FromRep, typename FromPeriod> |
| 1442 | To fmt_safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from) { |
| 1443 | int ec; |
| 1444 | To to = safe_duration_cast::safe_duration_cast<To>(from, ec); |
| 1445 | if (ec) FMT_THROW(format_error("cannot format duration")); |
| 1446 | return to; |
| 1447 | } |
| 1448 | #endif |
| 1449 | |
| 1450 | template <typename Rep, typename Period, |
| 1451 | FMT_ENABLE_IF(std::is_integral<Rep>::value)> |
| 1452 | inline std::chrono::duration<Rep, std::milli> get_milliseconds( |
| 1453 | std::chrono::duration<Rep, Period> d) { |
| 1454 | // this may overflow and/or the result may not fit in the |
| 1455 | // target type. |
| 1456 | #if FMT_SAFE_DURATION_CAST |
| 1457 | using CommonSecondsType = |
| 1458 | typename std::common_type<decltype(d), std::chrono::seconds>::type; |
| 1459 | const auto d_as_common = fmt_safe_duration_cast<CommonSecondsType>(d); |
| 1460 | const auto d_as_whole_seconds = |
| 1461 | fmt_safe_duration_cast<std::chrono::seconds>(d_as_common); |
| 1462 | // this conversion should be nonproblematic |
| 1463 | const auto diff = d_as_common - d_as_whole_seconds; |
| 1464 | const auto ms = |
| 1465 | fmt_safe_duration_cast<std::chrono::duration<Rep, std::milli>>(diff); |
| 1466 | return ms; |
| 1467 | #else |
| 1468 | auto s = std::chrono::duration_cast<std::chrono::seconds>(d); |
| 1469 | return std::chrono::duration_cast<std::chrono::milliseconds>(d - s); |
| 1470 | #endif |
| 1471 | } |
| 1472 | |
| 1473 | // Returns the number of fractional digits in the range [0, 18] according to the |
| 1474 | // C++20 spec. If more than 18 fractional digits are required then returns 6 for |
| 1475 | // microseconds precision. |
| 1476 | constexpr int count_fractional_digits(long long num, long long den, int n = 0) { |
| 1477 | return num % den == 0 |
| 1478 | ? n |
| 1479 | : (n > 18 ? 6 : count_fractional_digits(num * 10, den, n + 1)); |
| 1480 | } |
| 1481 | |
| 1482 | constexpr long long pow10(std::uint32_t n) { |
| 1483 | return n == 0 ? 1 : 10 * pow10(n - 1); |
| 1484 | } |
| 1485 | |
| 1486 | template <class Rep, class Period, |
| 1487 | FMT_ENABLE_IF(std::numeric_limits<Rep>::is_signed)> |
| 1488 | constexpr std::chrono::duration<Rep, Period> abs( |
| 1489 | std::chrono::duration<Rep, Period> d) { |
| 1490 | // We need to compare the duration using the count() method directly |
| 1491 | // due to a compiler bug in clang-11 regarding the spaceship operator, |
| 1492 | // when -Wzero-as-null-pointer-constant is enabled. |
| 1493 | // In clang-12 the bug has been fixed. See |
| 1494 | // https://bugs.llvm.org/show_bug.cgi?id=46235 and the reproducible example: |
| 1495 | // https://www.godbolt.org/z/Knbb5joYx. |
| 1496 | return d.count() >= d.zero().count() ? d : -d; |
| 1497 | } |
| 1498 | |
| 1499 | template <class Rep, class Period, |
| 1500 | FMT_ENABLE_IF(!std::numeric_limits<Rep>::is_signed)> |
| 1501 | constexpr std::chrono::duration<Rep, Period> abs( |
| 1502 | std::chrono::duration<Rep, Period> d) { |
| 1503 | return d; |
| 1504 | } |
| 1505 | |
| 1506 | template <typename Char, typename Rep, typename OutputIt, |
| 1507 | FMT_ENABLE_IF(std::is_integral<Rep>::value)> |
| 1508 | OutputIt format_duration_value(OutputIt out, Rep val, int) { |
| 1509 | return write<Char>(out, val); |
| 1510 | } |
| 1511 | |
| 1512 | template <typename Char, typename Rep, typename OutputIt, |
| 1513 | FMT_ENABLE_IF(std::is_floating_point<Rep>::value)> |
| 1514 | OutputIt format_duration_value(OutputIt out, Rep val, int precision) { |
| 1515 | auto specs = basic_format_specs<Char>(); |
| 1516 | specs.precision = precision; |
| 1517 | specs.type = precision >= 0 ? presentation_type::fixed_lower |
| 1518 | : presentation_type::general_lower; |
| 1519 | return write<Char>(out, val, specs); |
| 1520 | } |
| 1521 | |
| 1522 | template <typename Char, typename OutputIt> |
| 1523 | OutputIt copy_unit(string_view unit, OutputIt out, Char) { |
| 1524 | return std::copy(unit.begin(), unit.end(), out); |
| 1525 | } |
| 1526 | |
| 1527 | template <typename OutputIt> |
| 1528 | OutputIt copy_unit(string_view unit, OutputIt out, wchar_t) { |
| 1529 | // This works when wchar_t is UTF-32 because units only contain characters |
| 1530 | // that have the same representation in UTF-16 and UTF-32. |
| 1531 | utf8_to_utf16 u(unit); |
| 1532 | return std::copy(u.c_str(), u.c_str() + u.size(), out); |
| 1533 | } |
| 1534 | |
| 1535 | template <typename Char, typename Period, typename OutputIt> |
| 1536 | OutputIt format_duration_unit(OutputIt out) { |
| 1537 | if (const char* unit = get_units<Period>()) |
| 1538 | return copy_unit(string_view(unit), out, Char()); |
| 1539 | *out++ = '['; |
| 1540 | out = write<Char>(out, Period::num); |
| 1541 | if (const_check(Period::den != 1)) { |
| 1542 | *out++ = '/'; |
| 1543 | out = write<Char>(out, Period::den); |
| 1544 | } |
| 1545 | *out++ = ']'; |
| 1546 | *out++ = 's'; |
| 1547 | return out; |
| 1548 | } |
| 1549 | |
| 1550 | class get_locale { |
| 1551 | private: |
| 1552 | union { |
| 1553 | std::locale locale_; |
| 1554 | }; |
| 1555 | bool has_locale_ = false; |
| 1556 | |
| 1557 | public: |
| 1558 | get_locale(bool localized, locale_ref loc) : has_locale_(localized) { |
| 1559 | if (localized) |
| 1560 | ::new (&locale_) std::locale(loc.template get<std::locale>()); |
| 1561 | } |
| 1562 | ~get_locale() { |
| 1563 | if (has_locale_) locale_.~locale(); |
| 1564 | } |
| 1565 | operator const std::locale&() const { |
| 1566 | return has_locale_ ? locale_ : get_classic_locale(); |
| 1567 | } |
| 1568 | }; |
| 1569 | |
| 1570 | template <typename FormatContext, typename OutputIt, typename Rep, |
| 1571 | typename Period> |
| 1572 | struct chrono_formatter { |
| 1573 | FormatContext& context; |
| 1574 | OutputIt out; |
| 1575 | int precision; |
| 1576 | bool localized = false; |
| 1577 | // rep is unsigned to avoid overflow. |
| 1578 | using rep = |
| 1579 | conditional_t<std::is_integral<Rep>::value && sizeof(Rep) < sizeof(int), |
| 1580 | unsigned, typename make_unsigned_or_unchanged<Rep>::type>; |
| 1581 | rep val; |
| 1582 | using seconds = std::chrono::duration<rep>; |
| 1583 | seconds s; |
| 1584 | using milliseconds = std::chrono::duration<rep, std::milli>; |
| 1585 | bool negative; |
| 1586 | |
| 1587 | using char_type = typename FormatContext::char_type; |
| 1588 | using tm_writer_type = tm_writer<OutputIt, char_type>; |
| 1589 | |
| 1590 | chrono_formatter(FormatContext& ctx, OutputIt o, |
| 1591 | std::chrono::duration<Rep, Period> d) |
| 1592 | : context(ctx), |
| 1593 | out(o), |
| 1594 | val(static_cast<rep>(d.count())), |
| 1595 | negative(false) { |
| 1596 | if (d.count() < 0) { |
| 1597 | val = 0 - val; |
| 1598 | negative = true; |
| 1599 | } |
| 1600 | |
| 1601 | // this may overflow and/or the result may not fit in the |
| 1602 | // target type. |
| 1603 | #if FMT_SAFE_DURATION_CAST |
| 1604 | // might need checked conversion (rep!=Rep) |
| 1605 | auto tmpval = std::chrono::duration<rep, Period>(val); |
| 1606 | s = fmt_safe_duration_cast<seconds>(tmpval); |
| 1607 | #else |
| 1608 | s = std::chrono::duration_cast<seconds>( |
| 1609 | std::chrono::duration<rep, Period>(val)); |
| 1610 | #endif |
| 1611 | } |
| 1612 | |
| 1613 | // returns true if nan or inf, writes to out. |
| 1614 | bool handle_nan_inf() { |
| 1615 | if (isfinite(val)) { |
| 1616 | return false; |
| 1617 | } |
| 1618 | if (isnan(val)) { |
| 1619 | write_nan(); |
| 1620 | return true; |
| 1621 | } |
| 1622 | // must be +-inf |
| 1623 | if (val > 0) { |
| 1624 | write_pinf(); |
| 1625 | } else { |
| 1626 | write_ninf(); |
| 1627 | } |
| 1628 | return true; |
| 1629 | } |
| 1630 | |
| 1631 | Rep hour() const { return static_cast<Rep>(mod((s.count() / 3600), 24)); } |
| 1632 | |
| 1633 | Rep hour12() const { |
| 1634 | Rep hour = static_cast<Rep>(mod((s.count() / 3600), 12)); |
| 1635 | return hour <= 0 ? 12 : hour; |
| 1636 | } |
| 1637 | |
| 1638 | Rep minute() const { return static_cast<Rep>(mod((s.count() / 60), 60)); } |
| 1639 | Rep second() const { return static_cast<Rep>(mod(s.count(), 60)); } |
| 1640 | |
| 1641 | std::tm time() const { |
| 1642 | auto time = std::tm(); |
| 1643 | time.tm_hour = to_nonnegative_int(hour(), 24); |
| 1644 | time.tm_min = to_nonnegative_int(minute(), 60); |
| 1645 | time.tm_sec = to_nonnegative_int(second(), 60); |
| 1646 | return time; |
| 1647 | } |
| 1648 | |
| 1649 | void write_sign() { |
| 1650 | if (negative) { |
| 1651 | *out++ = '-'; |
| 1652 | negative = false; |
| 1653 | } |
| 1654 | } |
| 1655 | |
| 1656 | void write(Rep value, int width) { |
| 1657 | write_sign(); |
| 1658 | if (isnan(value)) return write_nan(); |
| 1659 | uint32_or_64_or_128_t<int> n = |
| 1660 | to_unsigned(to_nonnegative_int(value, max_value<int>())); |
| 1661 | int num_digits = detail::count_digits(n); |
| 1662 | if (width > num_digits) out = std::fill_n(out, width - num_digits, '0'); |
| 1663 | out = format_decimal<char_type>(out, n, num_digits).end; |
| 1664 | } |
| 1665 | |
| 1666 | template <class Duration> void write_fractional_seconds(Duration d) { |
| 1667 | constexpr auto num_fractional_digits = |
| 1668 | count_fractional_digits(Duration::period::num, Duration::period::den); |
| 1669 | |
| 1670 | using subsecond_precision = std::chrono::duration< |
| 1671 | typename std::common_type<typename Duration::rep, |
| 1672 | std::chrono::seconds::rep>::type, |
| 1673 | std::ratio<1, detail::pow10(num_fractional_digits)>>; |
| 1674 | if (std::ratio_less<typename subsecond_precision::period, |
| 1675 | std::chrono::seconds::period>::value) { |
| 1676 | *out++ = '.'; |
| 1677 | // Don't convert long double to integer seconds to avoid overflow. |
| 1678 | using sec = conditional_t< |
| 1679 | std::is_same<typename Duration::rep, long double>::value, |
| 1680 | std::chrono::duration<long double>, std::chrono::seconds>; |
| 1681 | auto fractional = detail::abs(d) - std::chrono::duration_cast<sec>(d); |
| 1682 | const auto subseconds = |
| 1683 | std::chrono::treat_as_floating_point< |
| 1684 | typename subsecond_precision::rep>::value |
| 1685 | ? fractional.count() |
| 1686 | : std::chrono::duration_cast<subsecond_precision>(fractional) |
| 1687 | .count(); |
| 1688 | uint32_or_64_or_128_t<long long> n = |
| 1689 | to_unsigned(to_nonnegative_int(subseconds, max_value<long long>())); |
| 1690 | int num_digits = detail::count_digits(n); |
| 1691 | if (num_fractional_digits > num_digits) |
| 1692 | out = std::fill_n(out, num_fractional_digits - num_digits, '0'); |
| 1693 | out = format_decimal<char_type>(out, n, num_digits).end; |
| 1694 | } |
| 1695 | } |
| 1696 | |
| 1697 | void write_nan() { std::copy_n("nan", 3, out); } |
| 1698 | void write_pinf() { std::copy_n("inf", 3, out); } |
| 1699 | void write_ninf() { std::copy_n("-inf", 4, out); } |
| 1700 | |
| 1701 | template <typename Callback, typename... Args> |
| 1702 | void format_tm(const tm& time, Callback cb, Args... args) { |
| 1703 | if (isnan(val)) return write_nan(); |
| 1704 | get_locale loc(localized, context.locale()); |
| 1705 | auto w = tm_writer_type(loc, out, time); |
| 1706 | (w.*cb)(args...); |
| 1707 | out = w.out(); |
| 1708 | } |
| 1709 | |
| 1710 | void on_text(const char_type* begin, const char_type* end) { |
| 1711 | std::copy(begin, end, out); |
| 1712 | } |
| 1713 | |
| 1714 | // These are not implemented because durations don't have date information. |
| 1715 | void on_abbr_weekday() {} |
| 1716 | void on_full_weekday() {} |
| 1717 | void on_dec0_weekday(numeric_system) {} |
| 1718 | void on_dec1_weekday(numeric_system) {} |
| 1719 | void on_abbr_month() {} |
| 1720 | void on_full_month() {} |
| 1721 | void on_datetime(numeric_system) {} |
| 1722 | void on_loc_date(numeric_system) {} |
| 1723 | void on_loc_time(numeric_system) {} |
| 1724 | void on_us_date() {} |
| 1725 | void on_iso_date() {} |
| 1726 | void on_utc_offset() {} |
| 1727 | void on_tz_name() {} |
| 1728 | void on_year(numeric_system) {} |
| 1729 | void on_short_year(numeric_system) {} |
| 1730 | void on_offset_year() {} |
| 1731 | void on_century(numeric_system) {} |
| 1732 | void on_iso_week_based_year() {} |
| 1733 | void on_iso_week_based_short_year() {} |
| 1734 | void on_dec_month(numeric_system) {} |
| 1735 | void on_dec0_week_of_year(numeric_system) {} |
| 1736 | void on_dec1_week_of_year(numeric_system) {} |
| 1737 | void on_iso_week_of_year(numeric_system) {} |
| 1738 | void on_day_of_year() {} |
| 1739 | void on_day_of_month(numeric_system) {} |
| 1740 | void on_day_of_month_space(numeric_system) {} |
| 1741 | |
| 1742 | void on_24_hour(numeric_system ns) { |
| 1743 | if (handle_nan_inf()) return; |
| 1744 | |
| 1745 | if (ns == numeric_system::standard) return write(hour(), 2); |
| 1746 | auto time = tm(); |
| 1747 | time.tm_hour = to_nonnegative_int(hour(), 24); |
| 1748 | format_tm(time, &tm_writer_type::on_24_hour, ns); |
| 1749 | } |
| 1750 | |
| 1751 | void on_12_hour(numeric_system ns) { |
| 1752 | if (handle_nan_inf()) return; |
| 1753 | |
| 1754 | if (ns == numeric_system::standard) return write(hour12(), 2); |
| 1755 | auto time = tm(); |
| 1756 | time.tm_hour = to_nonnegative_int(hour12(), 12); |
| 1757 | format_tm(time, &tm_writer_type::on_12_hour, ns); |
| 1758 | } |
| 1759 | |
| 1760 | void on_minute(numeric_system ns) { |
| 1761 | if (handle_nan_inf()) return; |
| 1762 | |
| 1763 | if (ns == numeric_system::standard) return write(minute(), 2); |
| 1764 | auto time = tm(); |
| 1765 | time.tm_min = to_nonnegative_int(minute(), 60); |
| 1766 | format_tm(time, &tm_writer_type::on_minute, ns); |
| 1767 | } |
| 1768 | |
| 1769 | void on_second(numeric_system ns) { |
| 1770 | if (handle_nan_inf()) return; |
| 1771 | |
| 1772 | if (ns == numeric_system::standard) { |
| 1773 | write(second(), 2); |
| 1774 | write_fractional_seconds(std::chrono::duration<rep, Period>{val}); |
| 1775 | return; |
| 1776 | } |
| 1777 | auto time = tm(); |
| 1778 | time.tm_sec = to_nonnegative_int(second(), 60); |
| 1779 | format_tm(time, &tm_writer_type::on_second, ns); |
| 1780 | } |
| 1781 | |
| 1782 | void on_12_hour_time() { |
| 1783 | if (handle_nan_inf()) return; |
| 1784 | format_tm(time(), &tm_writer_type::on_12_hour_time); |
| 1785 | } |
| 1786 | |
| 1787 | void on_24_hour_time() { |
| 1788 | if (handle_nan_inf()) { |
| 1789 | *out++ = ':'; |
| 1790 | handle_nan_inf(); |
| 1791 | return; |
| 1792 | } |
| 1793 | |
| 1794 | write(hour(), 2); |
| 1795 | *out++ = ':'; |
| 1796 | write(minute(), 2); |
| 1797 | } |
| 1798 | |
| 1799 | void on_iso_time() { |
| 1800 | on_24_hour_time(); |
| 1801 | *out++ = ':'; |
| 1802 | if (handle_nan_inf()) return; |
| 1803 | on_second(numeric_system::standard); |
| 1804 | } |
| 1805 | |
| 1806 | void on_am_pm() { |
| 1807 | if (handle_nan_inf()) return; |
| 1808 | format_tm(time(), &tm_writer_type::on_am_pm); |
| 1809 | } |
| 1810 | |
| 1811 | void on_duration_value() { |
| 1812 | if (handle_nan_inf()) return; |
| 1813 | write_sign(); |
| 1814 | out = format_duration_value<char_type>(out, val, precision); |
| 1815 | } |
| 1816 | |
| 1817 | void on_duration_unit() { |
| 1818 | out = format_duration_unit<char_type, Period>(out); |
| 1819 | } |
| 1820 | }; |
| 1821 | |
| 1822 | FMT_END_DETAIL_NAMESPACE |
| 1823 | |
| 1824 | #if defined(__cpp_lib_chrono) && __cpp_lib_chrono >= 201907 |
| 1825 | using weekday = std::chrono::weekday; |
| 1826 | #else |
| 1827 | // A fallback version of weekday. |
| 1828 | class weekday { |
| 1829 | private: |
| 1830 | unsigned char value; |
| 1831 | |
| 1832 | public: |
| 1833 | weekday() = default; |
| 1834 | explicit constexpr weekday(unsigned wd) noexcept |
| 1835 | : value(static_cast<unsigned char>(wd != 7 ? wd : 0)) {} |
| 1836 | constexpr unsigned c_encoding() const noexcept { return value; } |
| 1837 | }; |
| 1838 | |
| 1839 | class year_month_day {}; |
| 1840 | #endif |
| 1841 | |
| 1842 | // A rudimentary weekday formatter. |
| 1843 | template <typename Char> struct formatter<weekday, Char> { |
| 1844 | private: |
| 1845 | bool localized = false; |
| 1846 | |
| 1847 | public: |
| 1848 | FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx) |
| 1849 | -> decltype(ctx.begin()) { |
| 1850 | auto begin = ctx.begin(), end = ctx.end(); |
| 1851 | if (begin != end && *begin == 'L') { |
| 1852 | ++begin; |
| 1853 | localized = true; |
| 1854 | } |
| 1855 | return begin; |
| 1856 | } |
| 1857 | |
| 1858 | template <typename FormatContext> |
| 1859 | auto format(weekday wd, FormatContext& ctx) const -> decltype(ctx.out()) { |
| 1860 | auto time = std::tm(); |
| 1861 | time.tm_wday = static_cast<int>(wd.c_encoding()); |
| 1862 | detail::get_locale loc(localized, ctx.locale()); |
| 1863 | auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), time); |
| 1864 | w.on_abbr_weekday(); |
| 1865 | return w.out(); |
| 1866 | } |
| 1867 | }; |
| 1868 | |
| 1869 | template <typename Rep, typename Period, typename Char> |
| 1870 | struct formatter<std::chrono::duration<Rep, Period>, Char> { |
| 1871 | private: |
| 1872 | basic_format_specs<Char> specs; |
| 1873 | int precision = -1; |
| 1874 | using arg_ref_type = detail::arg_ref<Char>; |
| 1875 | arg_ref_type width_ref; |
| 1876 | arg_ref_type precision_ref; |
| 1877 | bool localized = false; |
| 1878 | basic_string_view<Char> format_str; |
| 1879 | using duration = std::chrono::duration<Rep, Period>; |
| 1880 | |
| 1881 | struct spec_handler { |
| 1882 | formatter& f; |
| 1883 | basic_format_parse_context<Char>& context; |
| 1884 | basic_string_view<Char> format_str; |
| 1885 | |
| 1886 | template <typename Id> FMT_CONSTEXPR arg_ref_type make_arg_ref(Id arg_id) { |
| 1887 | context.check_arg_id(arg_id); |
| 1888 | return arg_ref_type(arg_id); |
| 1889 | } |
| 1890 | |
| 1891 | FMT_CONSTEXPR arg_ref_type make_arg_ref(basic_string_view<Char> arg_id) { |
| 1892 | context.check_arg_id(arg_id); |
| 1893 | return arg_ref_type(arg_id); |
| 1894 | } |
| 1895 | |
| 1896 | FMT_CONSTEXPR arg_ref_type make_arg_ref(detail::auto_id) { |
| 1897 | return arg_ref_type(context.next_arg_id()); |
| 1898 | } |
| 1899 | |
| 1900 | void on_error(const char* msg) { FMT_THROW(format_error(msg)); } |
| 1901 | FMT_CONSTEXPR void on_fill(basic_string_view<Char> fill) { |
| 1902 | f.specs.fill = fill; |
| 1903 | } |
| 1904 | FMT_CONSTEXPR void on_align(align_t align) { f.specs.align = align; } |
| 1905 | FMT_CONSTEXPR void on_width(int width) { f.specs.width = width; } |
| 1906 | FMT_CONSTEXPR void on_precision(int _precision) { |
| 1907 | f.precision = _precision; |
| 1908 | } |
| 1909 | FMT_CONSTEXPR void end_precision() {} |
| 1910 | |
| 1911 | template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
| 1912 | f.width_ref = make_arg_ref(arg_id); |
| 1913 | } |
| 1914 | |
| 1915 | template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
| 1916 | f.precision_ref = make_arg_ref(arg_id); |
| 1917 | } |
| 1918 | }; |
| 1919 | |
| 1920 | using iterator = typename basic_format_parse_context<Char>::iterator; |
| 1921 | struct parse_range { |
| 1922 | iterator begin; |
| 1923 | iterator end; |
| 1924 | }; |
| 1925 | |
| 1926 | FMT_CONSTEXPR parse_range do_parse(basic_format_parse_context<Char>& ctx) { |
| 1927 | auto begin = ctx.begin(), end = ctx.end(); |
| 1928 | if (begin == end || *begin == '}') return {begin, begin}; |
| 1929 | spec_handler handler{*this, ctx, format_str}; |
| 1930 | begin = detail::parse_align(begin, end, handler); |
| 1931 | if (begin == end) return {begin, begin}; |
| 1932 | begin = detail::parse_width(begin, end, handler); |
| 1933 | if (begin == end) return {begin, begin}; |
| 1934 | if (*begin == '.') { |
| 1935 | if (std::is_floating_point<Rep>::value) |
| 1936 | begin = detail::parse_precision(begin, end, handler); |
| 1937 | else |
| 1938 | handler.on_error("precision not allowed for this argument type"); |
| 1939 | } |
| 1940 | if (begin != end && *begin == 'L') { |
| 1941 | ++begin; |
| 1942 | localized = true; |
| 1943 | } |
| 1944 | end = detail::parse_chrono_format(begin, end, |
| 1945 | detail::chrono_format_checker()); |
| 1946 | return {begin, end}; |
| 1947 | } |
| 1948 | |
| 1949 | public: |
| 1950 | FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx) |
| 1951 | -> decltype(ctx.begin()) { |
| 1952 | auto range = do_parse(ctx); |
| 1953 | format_str = basic_string_view<Char>( |
| 1954 | &*range.begin, detail::to_unsigned(range.end - range.begin)); |
| 1955 | return range.end; |
| 1956 | } |
| 1957 | |
| 1958 | template <typename FormatContext> |
| 1959 | auto format(const duration& d, FormatContext& ctx) const |
| 1960 | -> decltype(ctx.out()) { |
| 1961 | auto specs_copy = specs; |
| 1962 | auto precision_copy = precision; |
| 1963 | auto begin = format_str.begin(), end = format_str.end(); |
| 1964 | // As a possible future optimization, we could avoid extra copying if width |
| 1965 | // is not specified. |
| 1966 | basic_memory_buffer<Char> buf; |
| 1967 | auto out = std::back_inserter(buf); |
| 1968 | detail::handle_dynamic_spec<detail::width_checker>(specs_copy.width, |
| 1969 | width_ref, ctx); |
| 1970 | detail::handle_dynamic_spec<detail::precision_checker>(precision_copy, |
| 1971 | precision_ref, ctx); |
| 1972 | if (begin == end || *begin == '}') { |
| 1973 | out = detail::format_duration_value<Char>(out, d.count(), precision_copy); |
| 1974 | detail::format_duration_unit<Char, Period>(out); |
| 1975 | } else { |
| 1976 | detail::chrono_formatter<FormatContext, decltype(out), Rep, Period> f( |
| 1977 | ctx, out, d); |
| 1978 | f.precision = precision_copy; |
| 1979 | f.localized = localized; |
| 1980 | detail::parse_chrono_format(begin, end, f); |
| 1981 | } |
| 1982 | return detail::write( |
| 1983 | ctx.out(), basic_string_view<Char>(buf.data(), buf.size()), specs_copy); |
| 1984 | } |
| 1985 | }; |
| 1986 | |
| 1987 | template <typename Char, typename Duration> |
| 1988 | struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>, |
| 1989 | Char> : formatter<std::tm, Char> { |
| 1990 | FMT_CONSTEXPR formatter() { |
| 1991 | this->do_parse(default_specs, |
| 1992 | default_specs + sizeof(default_specs) / sizeof(Char)); |
| 1993 | } |
| 1994 | |
| 1995 | template <typename ParseContext> |
| 1996 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 1997 | return this->do_parse(ctx.begin(), ctx.end(), true); |
| 1998 | } |
| 1999 | |
| 2000 | template <typename FormatContext> |
| 2001 | auto format(std::chrono::time_point<std::chrono::system_clock> val, |
| 2002 | FormatContext& ctx) const -> decltype(ctx.out()) { |
| 2003 | return formatter<std::tm, Char>::format(localtime(val), ctx); |
| 2004 | } |
| 2005 | |
| 2006 | static constexpr const Char default_specs[] = {'%', 'F', ' ', '%', 'T'}; |
| 2007 | }; |
| 2008 | |
| 2009 | template <typename Char, typename Duration> |
| 2010 | constexpr const Char |
| 2011 | formatter<std::chrono::time_point<std::chrono::system_clock, Duration>, |
| 2012 | Char>::default_specs[]; |
| 2013 | |
| 2014 | template <typename Char> struct formatter<std::tm, Char> { |
| 2015 | private: |
| 2016 | enum class spec { |
| 2017 | unknown, |
| 2018 | year_month_day, |
| 2019 | hh_mm_ss, |
| 2020 | }; |
| 2021 | spec spec_ = spec::unknown; |
| 2022 | basic_string_view<Char> specs; |
| 2023 | |
| 2024 | protected: |
| 2025 | template <typename It> |
| 2026 | FMT_CONSTEXPR auto do_parse(It begin, It end, bool with_default = false) |
| 2027 | -> It { |
| 2028 | if (begin != end && *begin == ':') ++begin; |
| 2029 | end = detail::parse_chrono_format(begin, end, detail::tm_format_checker()); |
| 2030 | if (!with_default || end != begin) |
| 2031 | specs = {begin, detail::to_unsigned(end - begin)}; |
| 2032 | // basic_string_view<>::compare isn't constexpr before C++17. |
| 2033 | if (specs.size() == 2 && specs[0] == Char('%')) { |
| 2034 | if (specs[1] == Char('F')) |
| 2035 | spec_ = spec::year_month_day; |
| 2036 | else if (specs[1] == Char('T')) |
| 2037 | spec_ = spec::hh_mm_ss; |
| 2038 | } |
| 2039 | return end; |
| 2040 | } |
| 2041 | |
| 2042 | public: |
| 2043 | template <typename ParseContext> |
| 2044 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 2045 | return this->do_parse(ctx.begin(), ctx.end()); |
| 2046 | } |
| 2047 | |
| 2048 | template <typename FormatContext> |
| 2049 | auto format(const std::tm& tm, FormatContext& ctx) const |
| 2050 | -> decltype(ctx.out()) { |
| 2051 | const auto loc_ref = ctx.locale(); |
| 2052 | detail::get_locale loc(static_cast<bool>(loc_ref), loc_ref); |
| 2053 | auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), tm); |
| 2054 | if (spec_ == spec::year_month_day) |
| 2055 | w.on_iso_date(); |
| 2056 | else if (spec_ == spec::hh_mm_ss) |
| 2057 | w.on_iso_time(); |
| 2058 | else |
| 2059 | detail::parse_chrono_format(specs.begin(), specs.end(), w); |
| 2060 | return w.out(); |
| 2061 | } |
| 2062 | }; |
| 2063 | |
| 2064 | FMT_MODULE_EXPORT_END |
| 2065 | FMT_END_NAMESPACE |
| 2066 | |
| 2067 | #endif // FMT_CHRONO_H_ |