Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 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 <chrono> |
| 12 | #include <ctime> |
| 13 | #include <locale> |
| 14 | #include <sstream> |
| 15 | |
| 16 | #include "format.h" |
| 17 | #include "locale.h" |
| 18 | |
| 19 | FMT_BEGIN_NAMESPACE |
| 20 | |
| 21 | // Enable safe chrono durations, unless explicitly disabled. |
| 22 | #ifndef FMT_SAFE_DURATION_CAST |
| 23 | # define FMT_SAFE_DURATION_CAST 1 |
| 24 | #endif |
| 25 | #if FMT_SAFE_DURATION_CAST |
| 26 | |
| 27 | // For conversion between std::chrono::durations without undefined |
| 28 | // behaviour or erroneous results. |
| 29 | // This is a stripped down version of duration_cast, for inclusion in fmt. |
| 30 | // See https://github.com/pauldreik/safe_duration_cast |
| 31 | // |
| 32 | // Copyright Paul Dreik 2019 |
| 33 | namespace safe_duration_cast { |
| 34 | |
| 35 | template <typename To, typename From, |
| 36 | FMT_ENABLE_IF(!std::is_same<From, To>::value && |
| 37 | std::numeric_limits<From>::is_signed == |
| 38 | std::numeric_limits<To>::is_signed)> |
| 39 | FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) { |
| 40 | ec = 0; |
| 41 | using F = std::numeric_limits<From>; |
| 42 | using T = std::numeric_limits<To>; |
| 43 | static_assert(F::is_integer, "From must be integral"); |
| 44 | static_assert(T::is_integer, "To must be integral"); |
| 45 | |
| 46 | // A and B are both signed, or both unsigned. |
| 47 | if (F::digits <= T::digits) { |
| 48 | // From fits in To without any problem. |
| 49 | } else { |
| 50 | // From does not always fit in To, resort to a dynamic check. |
| 51 | if (from < (T::min)() || from > (T::max)()) { |
| 52 | // outside range. |
| 53 | ec = 1; |
| 54 | return {}; |
| 55 | } |
| 56 | } |
| 57 | return static_cast<To>(from); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * converts From to To, without loss. If the dynamic value of from |
| 62 | * can't be converted to To without loss, ec is set. |
| 63 | */ |
| 64 | template <typename To, typename From, |
| 65 | FMT_ENABLE_IF(!std::is_same<From, To>::value && |
| 66 | std::numeric_limits<From>::is_signed != |
| 67 | std::numeric_limits<To>::is_signed)> |
| 68 | FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) { |
| 69 | ec = 0; |
| 70 | using F = std::numeric_limits<From>; |
| 71 | using T = std::numeric_limits<To>; |
| 72 | static_assert(F::is_integer, "From must be integral"); |
| 73 | static_assert(T::is_integer, "To must be integral"); |
| 74 | |
| 75 | if (detail::const_check(F::is_signed && !T::is_signed)) { |
| 76 | // From may be negative, not allowed! |
| 77 | if (fmt::detail::is_negative(from)) { |
| 78 | ec = 1; |
| 79 | return {}; |
| 80 | } |
| 81 | // From is positive. Can it always fit in To? |
| 82 | if (F::digits > T::digits && |
| 83 | from > static_cast<From>(detail::max_value<To>())) { |
| 84 | ec = 1; |
| 85 | return {}; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | if (!F::is_signed && T::is_signed && F::digits >= T::digits && |
| 90 | from > static_cast<From>(detail::max_value<To>())) { |
| 91 | ec = 1; |
| 92 | return {}; |
| 93 | } |
| 94 | return static_cast<To>(from); // Lossless conversion. |
| 95 | } |
| 96 | |
| 97 | template <typename To, typename From, |
| 98 | FMT_ENABLE_IF(std::is_same<From, To>::value)> |
| 99 | FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) { |
| 100 | ec = 0; |
| 101 | return from; |
| 102 | } // function |
| 103 | |
| 104 | // clang-format off |
| 105 | /** |
| 106 | * converts From to To if possible, otherwise ec is set. |
| 107 | * |
| 108 | * input | output |
| 109 | * ---------------------------------|--------------- |
| 110 | * NaN | NaN |
| 111 | * Inf | Inf |
| 112 | * normal, fits in output | converted (possibly lossy) |
| 113 | * normal, does not fit in output | ec is set |
| 114 | * subnormal | best effort |
| 115 | * -Inf | -Inf |
| 116 | */ |
| 117 | // clang-format on |
| 118 | template <typename To, typename From, |
| 119 | FMT_ENABLE_IF(!std::is_same<From, To>::value)> |
| 120 | FMT_CONSTEXPR To safe_float_conversion(const From from, int& ec) { |
| 121 | ec = 0; |
| 122 | using T = std::numeric_limits<To>; |
| 123 | static_assert(std::is_floating_point<From>::value, "From must be floating"); |
| 124 | static_assert(std::is_floating_point<To>::value, "To must be floating"); |
| 125 | |
| 126 | // catch the only happy case |
| 127 | if (std::isfinite(from)) { |
| 128 | if (from >= T::lowest() && from <= (T::max)()) { |
| 129 | return static_cast<To>(from); |
| 130 | } |
| 131 | // not within range. |
| 132 | ec = 1; |
| 133 | return {}; |
| 134 | } |
| 135 | |
| 136 | // nan and inf will be preserved |
| 137 | return static_cast<To>(from); |
| 138 | } // function |
| 139 | |
| 140 | template <typename To, typename From, |
| 141 | FMT_ENABLE_IF(std::is_same<From, To>::value)> |
| 142 | FMT_CONSTEXPR To safe_float_conversion(const From from, int& ec) { |
| 143 | ec = 0; |
| 144 | static_assert(std::is_floating_point<From>::value, "From must be floating"); |
| 145 | return from; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * safe duration cast between integral durations |
| 150 | */ |
| 151 | template <typename To, typename FromRep, typename FromPeriod, |
| 152 | FMT_ENABLE_IF(std::is_integral<FromRep>::value), |
| 153 | FMT_ENABLE_IF(std::is_integral<typename To::rep>::value)> |
| 154 | To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from, |
| 155 | int& ec) { |
| 156 | using From = std::chrono::duration<FromRep, FromPeriod>; |
| 157 | ec = 0; |
| 158 | // the basic idea is that we need to convert from count() in the from type |
| 159 | // to count() in the To type, by multiplying it with this: |
| 160 | struct Factor |
| 161 | : std::ratio_divide<typename From::period, typename To::period> {}; |
| 162 | |
| 163 | static_assert(Factor::num > 0, "num must be positive"); |
| 164 | static_assert(Factor::den > 0, "den must be positive"); |
| 165 | |
| 166 | // the conversion is like this: multiply from.count() with Factor::num |
| 167 | // /Factor::den and convert it to To::rep, all this without |
| 168 | // overflow/underflow. let's start by finding a suitable type that can hold |
| 169 | // both To, From and Factor::num |
| 170 | using IntermediateRep = |
| 171 | typename std::common_type<typename From::rep, typename To::rep, |
| 172 | decltype(Factor::num)>::type; |
| 173 | |
| 174 | // safe conversion to IntermediateRep |
| 175 | IntermediateRep count = |
| 176 | lossless_integral_conversion<IntermediateRep>(from.count(), ec); |
| 177 | if (ec) return {}; |
| 178 | // multiply with Factor::num without overflow or underflow |
| 179 | if (detail::const_check(Factor::num != 1)) { |
| 180 | const auto max1 = detail::max_value<IntermediateRep>() / Factor::num; |
| 181 | if (count > max1) { |
| 182 | ec = 1; |
| 183 | return {}; |
| 184 | } |
| 185 | const auto min1 = |
| 186 | (std::numeric_limits<IntermediateRep>::min)() / Factor::num; |
| 187 | if (count < min1) { |
| 188 | ec = 1; |
| 189 | return {}; |
| 190 | } |
| 191 | count *= Factor::num; |
| 192 | } |
| 193 | |
| 194 | if (detail::const_check(Factor::den != 1)) count /= Factor::den; |
| 195 | auto tocount = lossless_integral_conversion<typename To::rep>(count, ec); |
| 196 | return ec ? To() : To(tocount); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * safe duration_cast between floating point durations |
| 201 | */ |
| 202 | template <typename To, typename FromRep, typename FromPeriod, |
| 203 | FMT_ENABLE_IF(std::is_floating_point<FromRep>::value), |
| 204 | FMT_ENABLE_IF(std::is_floating_point<typename To::rep>::value)> |
| 205 | To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from, |
| 206 | int& ec) { |
| 207 | using From = std::chrono::duration<FromRep, FromPeriod>; |
| 208 | ec = 0; |
| 209 | if (std::isnan(from.count())) { |
| 210 | // nan in, gives nan out. easy. |
| 211 | return To{std::numeric_limits<typename To::rep>::quiet_NaN()}; |
| 212 | } |
| 213 | // maybe we should also check if from is denormal, and decide what to do about |
| 214 | // it. |
| 215 | |
| 216 | // +-inf should be preserved. |
| 217 | if (std::isinf(from.count())) { |
| 218 | return To{from.count()}; |
| 219 | } |
| 220 | |
| 221 | // the basic idea is that we need to convert from count() in the from type |
| 222 | // to count() in the To type, by multiplying it with this: |
| 223 | struct Factor |
| 224 | : std::ratio_divide<typename From::period, typename To::period> {}; |
| 225 | |
| 226 | static_assert(Factor::num > 0, "num must be positive"); |
| 227 | static_assert(Factor::den > 0, "den must be positive"); |
| 228 | |
| 229 | // the conversion is like this: multiply from.count() with Factor::num |
| 230 | // /Factor::den and convert it to To::rep, all this without |
| 231 | // overflow/underflow. let's start by finding a suitable type that can hold |
| 232 | // both To, From and Factor::num |
| 233 | using IntermediateRep = |
| 234 | typename std::common_type<typename From::rep, typename To::rep, |
| 235 | decltype(Factor::num)>::type; |
| 236 | |
| 237 | // force conversion of From::rep -> IntermediateRep to be safe, |
| 238 | // even if it will never happen be narrowing in this context. |
| 239 | IntermediateRep count = |
| 240 | safe_float_conversion<IntermediateRep>(from.count(), ec); |
| 241 | if (ec) { |
| 242 | return {}; |
| 243 | } |
| 244 | |
| 245 | // multiply with Factor::num without overflow or underflow |
| 246 | if (Factor::num != 1) { |
| 247 | constexpr auto max1 = detail::max_value<IntermediateRep>() / |
| 248 | static_cast<IntermediateRep>(Factor::num); |
| 249 | if (count > max1) { |
| 250 | ec = 1; |
| 251 | return {}; |
| 252 | } |
| 253 | constexpr auto min1 = std::numeric_limits<IntermediateRep>::lowest() / |
| 254 | static_cast<IntermediateRep>(Factor::num); |
| 255 | if (count < min1) { |
| 256 | ec = 1; |
| 257 | return {}; |
| 258 | } |
| 259 | count *= static_cast<IntermediateRep>(Factor::num); |
| 260 | } |
| 261 | |
| 262 | // this can't go wrong, right? den>0 is checked earlier. |
| 263 | if (Factor::den != 1) { |
| 264 | using common_t = typename std::common_type<IntermediateRep, intmax_t>::type; |
| 265 | count /= static_cast<common_t>(Factor::den); |
| 266 | } |
| 267 | |
| 268 | // convert to the to type, safely |
| 269 | using ToRep = typename To::rep; |
| 270 | |
| 271 | const ToRep tocount = safe_float_conversion<ToRep>(count, ec); |
| 272 | if (ec) { |
| 273 | return {}; |
| 274 | } |
| 275 | return To{tocount}; |
| 276 | } |
| 277 | } // namespace safe_duration_cast |
| 278 | #endif |
| 279 | |
| 280 | // Prevents expansion of a preceding token as a function-style macro. |
| 281 | // Usage: f FMT_NOMACRO() |
| 282 | #define FMT_NOMACRO |
| 283 | |
| 284 | namespace detail { |
| 285 | inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); } |
| 286 | inline null<> localtime_s(...) { return null<>(); } |
| 287 | inline null<> gmtime_r(...) { return null<>(); } |
| 288 | inline null<> gmtime_s(...) { return null<>(); } |
| 289 | } // namespace detail |
| 290 | |
| 291 | // Thread-safe replacement for std::localtime |
| 292 | inline std::tm localtime(std::time_t time) { |
| 293 | struct dispatcher { |
| 294 | std::time_t time_; |
| 295 | std::tm tm_; |
| 296 | |
| 297 | dispatcher(std::time_t t) : time_(t) {} |
| 298 | |
| 299 | bool run() { |
| 300 | using namespace fmt::detail; |
| 301 | return handle(localtime_r(&time_, &tm_)); |
| 302 | } |
| 303 | |
| 304 | bool handle(std::tm* tm) { return tm != nullptr; } |
| 305 | |
| 306 | bool handle(detail::null<>) { |
| 307 | using namespace fmt::detail; |
| 308 | return fallback(localtime_s(&tm_, &time_)); |
| 309 | } |
| 310 | |
| 311 | bool fallback(int res) { return res == 0; } |
| 312 | |
| 313 | #if !FMT_MSC_VER |
| 314 | bool fallback(detail::null<>) { |
| 315 | using namespace fmt::detail; |
| 316 | std::tm* tm = std::localtime(&time_); |
| 317 | if (tm) tm_ = *tm; |
| 318 | return tm != nullptr; |
| 319 | } |
| 320 | #endif |
| 321 | }; |
| 322 | dispatcher lt(time); |
| 323 | // Too big time values may be unsupported. |
| 324 | if (!lt.run()) FMT_THROW(format_error("time_t value out of range")); |
| 325 | return lt.tm_; |
| 326 | } |
| 327 | |
| 328 | inline std::tm localtime( |
| 329 | std::chrono::time_point<std::chrono::system_clock> time_point) { |
| 330 | return localtime(std::chrono::system_clock::to_time_t(time_point)); |
| 331 | } |
| 332 | |
| 333 | // Thread-safe replacement for std::gmtime |
| 334 | inline std::tm gmtime(std::time_t time) { |
| 335 | struct dispatcher { |
| 336 | std::time_t time_; |
| 337 | std::tm tm_; |
| 338 | |
| 339 | dispatcher(std::time_t t) : time_(t) {} |
| 340 | |
| 341 | bool run() { |
| 342 | using namespace fmt::detail; |
| 343 | return handle(gmtime_r(&time_, &tm_)); |
| 344 | } |
| 345 | |
| 346 | bool handle(std::tm* tm) { return tm != nullptr; } |
| 347 | |
| 348 | bool handle(detail::null<>) { |
| 349 | using namespace fmt::detail; |
| 350 | return fallback(gmtime_s(&tm_, &time_)); |
| 351 | } |
| 352 | |
| 353 | bool fallback(int res) { return res == 0; } |
| 354 | |
| 355 | #if !FMT_MSC_VER |
| 356 | bool fallback(detail::null<>) { |
| 357 | std::tm* tm = std::gmtime(&time_); |
| 358 | if (tm) tm_ = *tm; |
| 359 | return tm != nullptr; |
| 360 | } |
| 361 | #endif |
| 362 | }; |
| 363 | dispatcher gt(time); |
| 364 | // Too big time values may be unsupported. |
| 365 | if (!gt.run()) FMT_THROW(format_error("time_t value out of range")); |
| 366 | return gt.tm_; |
| 367 | } |
| 368 | |
| 369 | inline std::tm gmtime( |
| 370 | std::chrono::time_point<std::chrono::system_clock> time_point) { |
| 371 | return gmtime(std::chrono::system_clock::to_time_t(time_point)); |
| 372 | } |
| 373 | |
| 374 | namespace detail { |
| 375 | inline size_t strftime(char* str, size_t count, const char* format, |
| 376 | const std::tm* time) { |
| 377 | return std::strftime(str, count, format, time); |
| 378 | } |
| 379 | |
| 380 | inline size_t strftime(wchar_t* str, size_t count, const wchar_t* format, |
| 381 | const std::tm* time) { |
| 382 | return std::wcsftime(str, count, format, time); |
| 383 | } |
| 384 | } // namespace detail |
| 385 | |
| 386 | template <typename Char> |
| 387 | struct formatter<std::chrono::time_point<std::chrono::system_clock>, Char> |
| 388 | : formatter<std::tm, Char> { |
| 389 | template <typename FormatContext> |
| 390 | auto format(std::chrono::time_point<std::chrono::system_clock> val, |
| 391 | FormatContext& ctx) -> decltype(ctx.out()) { |
| 392 | std::tm time = localtime(val); |
| 393 | return formatter<std::tm, Char>::format(time, ctx); |
| 394 | } |
| 395 | }; |
| 396 | |
| 397 | template <typename Char> struct formatter<std::tm, Char> { |
| 398 | template <typename ParseContext> |
| 399 | auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 400 | auto it = ctx.begin(); |
| 401 | if (it != ctx.end() && *it == ':') ++it; |
| 402 | auto end = it; |
| 403 | while (end != ctx.end() && *end != '}') ++end; |
| 404 | tm_format.reserve(detail::to_unsigned(end - it + 1)); |
| 405 | tm_format.append(it, end); |
| 406 | tm_format.push_back('\0'); |
| 407 | return end; |
| 408 | } |
| 409 | |
| 410 | template <typename FormatContext> |
| 411 | auto format(const std::tm& tm, FormatContext& ctx) -> decltype(ctx.out()) { |
| 412 | basic_memory_buffer<Char> buf; |
| 413 | size_t start = buf.size(); |
| 414 | for (;;) { |
| 415 | size_t size = buf.capacity() - start; |
| 416 | size_t count = detail::strftime(&buf[start], size, &tm_format[0], &tm); |
| 417 | if (count != 0) { |
| 418 | buf.resize(start + count); |
| 419 | break; |
| 420 | } |
| 421 | if (size >= tm_format.size() * 256) { |
| 422 | // If the buffer is 256 times larger than the format string, assume |
| 423 | // that `strftime` gives an empty result. There doesn't seem to be a |
| 424 | // better way to distinguish the two cases: |
| 425 | // https://github.com/fmtlib/fmt/issues/367 |
| 426 | break; |
| 427 | } |
| 428 | const size_t MIN_GROWTH = 10; |
| 429 | buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH)); |
| 430 | } |
| 431 | return std::copy(buf.begin(), buf.end(), ctx.out()); |
| 432 | } |
| 433 | |
| 434 | basic_memory_buffer<Char> tm_format; |
| 435 | }; |
| 436 | |
| 437 | namespace detail { |
| 438 | template <typename Period> FMT_CONSTEXPR const char* get_units() { |
| 439 | return nullptr; |
| 440 | } |
| 441 | template <> FMT_CONSTEXPR const char* get_units<std::atto>() { return "as"; } |
| 442 | template <> FMT_CONSTEXPR const char* get_units<std::femto>() { return "fs"; } |
| 443 | template <> FMT_CONSTEXPR const char* get_units<std::pico>() { return "ps"; } |
| 444 | template <> FMT_CONSTEXPR const char* get_units<std::nano>() { return "ns"; } |
| 445 | template <> FMT_CONSTEXPR const char* get_units<std::micro>() { return "µs"; } |
| 446 | template <> FMT_CONSTEXPR const char* get_units<std::milli>() { return "ms"; } |
| 447 | template <> FMT_CONSTEXPR const char* get_units<std::centi>() { return "cs"; } |
| 448 | template <> FMT_CONSTEXPR const char* get_units<std::deci>() { return "ds"; } |
| 449 | template <> FMT_CONSTEXPR const char* get_units<std::ratio<1>>() { return "s"; } |
| 450 | template <> FMT_CONSTEXPR const char* get_units<std::deca>() { return "das"; } |
| 451 | template <> FMT_CONSTEXPR const char* get_units<std::hecto>() { return "hs"; } |
| 452 | template <> FMT_CONSTEXPR const char* get_units<std::kilo>() { return "ks"; } |
| 453 | template <> FMT_CONSTEXPR const char* get_units<std::mega>() { return "Ms"; } |
| 454 | template <> FMT_CONSTEXPR const char* get_units<std::giga>() { return "Gs"; } |
| 455 | template <> FMT_CONSTEXPR const char* get_units<std::tera>() { return "Ts"; } |
| 456 | template <> FMT_CONSTEXPR const char* get_units<std::peta>() { return "Ps"; } |
| 457 | template <> FMT_CONSTEXPR const char* get_units<std::exa>() { return "Es"; } |
| 458 | template <> FMT_CONSTEXPR const char* get_units<std::ratio<60>>() { |
| 459 | return "m"; |
| 460 | } |
| 461 | template <> FMT_CONSTEXPR const char* get_units<std::ratio<3600>>() { |
| 462 | return "h"; |
| 463 | } |
| 464 | |
| 465 | enum class numeric_system { |
| 466 | standard, |
| 467 | // Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale. |
| 468 | alternative |
| 469 | }; |
| 470 | |
| 471 | // Parses a put_time-like format string and invokes handler actions. |
| 472 | template <typename Char, typename Handler> |
| 473 | FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin, |
| 474 | const Char* end, |
| 475 | Handler&& handler) { |
| 476 | auto ptr = begin; |
| 477 | while (ptr != end) { |
| 478 | auto c = *ptr; |
| 479 | if (c == '}') break; |
| 480 | if (c != '%') { |
| 481 | ++ptr; |
| 482 | continue; |
| 483 | } |
| 484 | if (begin != ptr) handler.on_text(begin, ptr); |
| 485 | ++ptr; // consume '%' |
| 486 | if (ptr == end) FMT_THROW(format_error("invalid format")); |
| 487 | c = *ptr++; |
| 488 | switch (c) { |
| 489 | case '%': |
| 490 | handler.on_text(ptr - 1, ptr); |
| 491 | break; |
| 492 | case 'n': { |
| 493 | const Char newline[] = {'\n'}; |
| 494 | handler.on_text(newline, newline + 1); |
| 495 | break; |
| 496 | } |
| 497 | case 't': { |
| 498 | const Char tab[] = {'\t'}; |
| 499 | handler.on_text(tab, tab + 1); |
| 500 | break; |
| 501 | } |
| 502 | // Day of the week: |
| 503 | case 'a': |
| 504 | handler.on_abbr_weekday(); |
| 505 | break; |
| 506 | case 'A': |
| 507 | handler.on_full_weekday(); |
| 508 | break; |
| 509 | case 'w': |
| 510 | handler.on_dec0_weekday(numeric_system::standard); |
| 511 | break; |
| 512 | case 'u': |
| 513 | handler.on_dec1_weekday(numeric_system::standard); |
| 514 | break; |
| 515 | // Month: |
| 516 | case 'b': |
| 517 | handler.on_abbr_month(); |
| 518 | break; |
| 519 | case 'B': |
| 520 | handler.on_full_month(); |
| 521 | break; |
| 522 | // Hour, minute, second: |
| 523 | case 'H': |
| 524 | handler.on_24_hour(numeric_system::standard); |
| 525 | break; |
| 526 | case 'I': |
| 527 | handler.on_12_hour(numeric_system::standard); |
| 528 | break; |
| 529 | case 'M': |
| 530 | handler.on_minute(numeric_system::standard); |
| 531 | break; |
| 532 | case 'S': |
| 533 | handler.on_second(numeric_system::standard); |
| 534 | break; |
| 535 | // Other: |
| 536 | case 'c': |
| 537 | handler.on_datetime(numeric_system::standard); |
| 538 | break; |
| 539 | case 'x': |
| 540 | handler.on_loc_date(numeric_system::standard); |
| 541 | break; |
| 542 | case 'X': |
| 543 | handler.on_loc_time(numeric_system::standard); |
| 544 | break; |
| 545 | case 'D': |
| 546 | handler.on_us_date(); |
| 547 | break; |
| 548 | case 'F': |
| 549 | handler.on_iso_date(); |
| 550 | break; |
| 551 | case 'r': |
| 552 | handler.on_12_hour_time(); |
| 553 | break; |
| 554 | case 'R': |
| 555 | handler.on_24_hour_time(); |
| 556 | break; |
| 557 | case 'T': |
| 558 | handler.on_iso_time(); |
| 559 | break; |
| 560 | case 'p': |
| 561 | handler.on_am_pm(); |
| 562 | break; |
| 563 | case 'Q': |
| 564 | handler.on_duration_value(); |
| 565 | break; |
| 566 | case 'q': |
| 567 | handler.on_duration_unit(); |
| 568 | break; |
| 569 | case 'z': |
| 570 | handler.on_utc_offset(); |
| 571 | break; |
| 572 | case 'Z': |
| 573 | handler.on_tz_name(); |
| 574 | break; |
| 575 | // Alternative representation: |
| 576 | case 'E': { |
| 577 | if (ptr == end) FMT_THROW(format_error("invalid format")); |
| 578 | c = *ptr++; |
| 579 | switch (c) { |
| 580 | case 'c': |
| 581 | handler.on_datetime(numeric_system::alternative); |
| 582 | break; |
| 583 | case 'x': |
| 584 | handler.on_loc_date(numeric_system::alternative); |
| 585 | break; |
| 586 | case 'X': |
| 587 | handler.on_loc_time(numeric_system::alternative); |
| 588 | break; |
| 589 | default: |
| 590 | FMT_THROW(format_error("invalid format")); |
| 591 | } |
| 592 | break; |
| 593 | } |
| 594 | case 'O': |
| 595 | if (ptr == end) FMT_THROW(format_error("invalid format")); |
| 596 | c = *ptr++; |
| 597 | switch (c) { |
| 598 | case 'w': |
| 599 | handler.on_dec0_weekday(numeric_system::alternative); |
| 600 | break; |
| 601 | case 'u': |
| 602 | handler.on_dec1_weekday(numeric_system::alternative); |
| 603 | break; |
| 604 | case 'H': |
| 605 | handler.on_24_hour(numeric_system::alternative); |
| 606 | break; |
| 607 | case 'I': |
| 608 | handler.on_12_hour(numeric_system::alternative); |
| 609 | break; |
| 610 | case 'M': |
| 611 | handler.on_minute(numeric_system::alternative); |
| 612 | break; |
| 613 | case 'S': |
| 614 | handler.on_second(numeric_system::alternative); |
| 615 | break; |
| 616 | default: |
| 617 | FMT_THROW(format_error("invalid format")); |
| 618 | } |
| 619 | break; |
| 620 | default: |
| 621 | FMT_THROW(format_error("invalid format")); |
| 622 | } |
| 623 | begin = ptr; |
| 624 | } |
| 625 | if (begin != ptr) handler.on_text(begin, ptr); |
| 626 | return ptr; |
| 627 | } |
| 628 | |
| 629 | struct chrono_format_checker { |
| 630 | FMT_NORETURN void report_no_date() { FMT_THROW(format_error("no date")); } |
| 631 | |
| 632 | template <typename Char> void on_text(const Char*, const Char*) {} |
| 633 | FMT_NORETURN void on_abbr_weekday() { report_no_date(); } |
| 634 | FMT_NORETURN void on_full_weekday() { report_no_date(); } |
| 635 | FMT_NORETURN void on_dec0_weekday(numeric_system) { report_no_date(); } |
| 636 | FMT_NORETURN void on_dec1_weekday(numeric_system) { report_no_date(); } |
| 637 | FMT_NORETURN void on_abbr_month() { report_no_date(); } |
| 638 | FMT_NORETURN void on_full_month() { report_no_date(); } |
| 639 | void on_24_hour(numeric_system) {} |
| 640 | void on_12_hour(numeric_system) {} |
| 641 | void on_minute(numeric_system) {} |
| 642 | void on_second(numeric_system) {} |
| 643 | FMT_NORETURN void on_datetime(numeric_system) { report_no_date(); } |
| 644 | FMT_NORETURN void on_loc_date(numeric_system) { report_no_date(); } |
| 645 | FMT_NORETURN void on_loc_time(numeric_system) { report_no_date(); } |
| 646 | FMT_NORETURN void on_us_date() { report_no_date(); } |
| 647 | FMT_NORETURN void on_iso_date() { report_no_date(); } |
| 648 | void on_12_hour_time() {} |
| 649 | void on_24_hour_time() {} |
| 650 | void on_iso_time() {} |
| 651 | void on_am_pm() {} |
| 652 | void on_duration_value() {} |
| 653 | void on_duration_unit() {} |
| 654 | FMT_NORETURN void on_utc_offset() { report_no_date(); } |
| 655 | FMT_NORETURN void on_tz_name() { report_no_date(); } |
| 656 | }; |
| 657 | |
| 658 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 659 | inline bool isnan(T) { |
| 660 | return false; |
| 661 | } |
| 662 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 663 | inline bool isnan(T value) { |
| 664 | return std::isnan(value); |
| 665 | } |
| 666 | |
| 667 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 668 | inline bool isfinite(T) { |
| 669 | return true; |
| 670 | } |
| 671 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 672 | inline bool isfinite(T value) { |
| 673 | return std::isfinite(value); |
| 674 | } |
| 675 | |
| 676 | // Converts value to int and checks that it's in the range [0, upper). |
| 677 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 678 | inline int to_nonnegative_int(T value, int upper) { |
| 679 | FMT_ASSERT(value >= 0 && value <= upper, "invalid value"); |
| 680 | (void)upper; |
| 681 | return static_cast<int>(value); |
| 682 | } |
| 683 | template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 684 | inline int to_nonnegative_int(T value, int upper) { |
| 685 | FMT_ASSERT( |
| 686 | std::isnan(value) || (value >= 0 && value <= static_cast<T>(upper)), |
| 687 | "invalid value"); |
| 688 | (void)upper; |
| 689 | return static_cast<int>(value); |
| 690 | } |
| 691 | |
| 692 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 693 | inline T mod(T x, int y) { |
| 694 | return x % static_cast<T>(y); |
| 695 | } |
| 696 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 697 | inline T mod(T x, int y) { |
| 698 | return std::fmod(x, static_cast<T>(y)); |
| 699 | } |
| 700 | |
| 701 | // If T is an integral type, maps T to its unsigned counterpart, otherwise |
| 702 | // leaves it unchanged (unlike std::make_unsigned). |
| 703 | template <typename T, bool INTEGRAL = std::is_integral<T>::value> |
| 704 | struct make_unsigned_or_unchanged { |
| 705 | using type = T; |
| 706 | }; |
| 707 | |
| 708 | template <typename T> struct make_unsigned_or_unchanged<T, true> { |
| 709 | using type = typename std::make_unsigned<T>::type; |
| 710 | }; |
| 711 | |
| 712 | #if FMT_SAFE_DURATION_CAST |
| 713 | // throwing version of safe_duration_cast |
| 714 | template <typename To, typename FromRep, typename FromPeriod> |
| 715 | To fmt_safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from) { |
| 716 | int ec; |
| 717 | To to = safe_duration_cast::safe_duration_cast<To>(from, ec); |
| 718 | if (ec) FMT_THROW(format_error("cannot format duration")); |
| 719 | return to; |
| 720 | } |
| 721 | #endif |
| 722 | |
| 723 | template <typename Rep, typename Period, |
| 724 | FMT_ENABLE_IF(std::is_integral<Rep>::value)> |
| 725 | inline std::chrono::duration<Rep, std::milli> get_milliseconds( |
| 726 | std::chrono::duration<Rep, Period> d) { |
| 727 | // this may overflow and/or the result may not fit in the |
| 728 | // target type. |
| 729 | #if FMT_SAFE_DURATION_CAST |
| 730 | using CommonSecondsType = |
| 731 | typename std::common_type<decltype(d), std::chrono::seconds>::type; |
| 732 | const auto d_as_common = fmt_safe_duration_cast<CommonSecondsType>(d); |
| 733 | const auto d_as_whole_seconds = |
| 734 | fmt_safe_duration_cast<std::chrono::seconds>(d_as_common); |
| 735 | // this conversion should be nonproblematic |
| 736 | const auto diff = d_as_common - d_as_whole_seconds; |
| 737 | const auto ms = |
| 738 | fmt_safe_duration_cast<std::chrono::duration<Rep, std::milli>>(diff); |
| 739 | return ms; |
| 740 | #else |
| 741 | auto s = std::chrono::duration_cast<std::chrono::seconds>(d); |
| 742 | return std::chrono::duration_cast<std::chrono::milliseconds>(d - s); |
| 743 | #endif |
| 744 | } |
| 745 | |
| 746 | template <typename Rep, typename Period, |
| 747 | FMT_ENABLE_IF(std::is_floating_point<Rep>::value)> |
| 748 | inline std::chrono::duration<Rep, std::milli> get_milliseconds( |
| 749 | std::chrono::duration<Rep, Period> d) { |
| 750 | using common_type = typename std::common_type<Rep, std::intmax_t>::type; |
| 751 | auto ms = mod(d.count() * static_cast<common_type>(Period::num) / |
| 752 | static_cast<common_type>(Period::den) * 1000, |
| 753 | 1000); |
| 754 | return std::chrono::duration<Rep, std::milli>(static_cast<Rep>(ms)); |
| 755 | } |
| 756 | |
| 757 | template <typename Char, typename Rep, typename OutputIt> |
| 758 | OutputIt format_duration_value(OutputIt out, Rep val, int precision) { |
| 759 | const Char pr_f[] = {'{', ':', '.', '{', '}', 'f', '}', 0}; |
| 760 | if (precision >= 0) return format_to(out, pr_f, val, precision); |
| 761 | const Char fp_f[] = {'{', ':', 'g', '}', 0}; |
| 762 | const Char format[] = {'{', '}', 0}; |
| 763 | return format_to(out, std::is_floating_point<Rep>::value ? fp_f : format, |
| 764 | val); |
| 765 | } |
| 766 | template <typename Char, typename OutputIt> |
| 767 | OutputIt copy_unit(string_view unit, OutputIt out, Char) { |
| 768 | return std::copy(unit.begin(), unit.end(), out); |
| 769 | } |
| 770 | |
| 771 | template <typename OutputIt> |
| 772 | OutputIt copy_unit(string_view unit, OutputIt out, wchar_t) { |
| 773 | // This works when wchar_t is UTF-32 because units only contain characters |
| 774 | // that have the same representation in UTF-16 and UTF-32. |
| 775 | utf8_to_utf16 u(unit); |
| 776 | return std::copy(u.c_str(), u.c_str() + u.size(), out); |
| 777 | } |
| 778 | |
| 779 | template <typename Char, typename Period, typename OutputIt> |
| 780 | OutputIt format_duration_unit(OutputIt out) { |
| 781 | if (const char* unit = get_units<Period>()) |
| 782 | return copy_unit(string_view(unit), out, Char()); |
| 783 | const Char num_f[] = {'[', '{', '}', ']', 's', 0}; |
| 784 | if (const_check(Period::den == 1)) return format_to(out, num_f, Period::num); |
| 785 | const Char num_def_f[] = {'[', '{', '}', '/', '{', '}', ']', 's', 0}; |
| 786 | return format_to(out, num_def_f, Period::num, Period::den); |
| 787 | } |
| 788 | |
| 789 | template <typename FormatContext, typename OutputIt, typename Rep, |
| 790 | typename Period> |
| 791 | struct chrono_formatter { |
| 792 | FormatContext& context; |
| 793 | OutputIt out; |
| 794 | int precision; |
| 795 | // rep is unsigned to avoid overflow. |
| 796 | using rep = |
| 797 | conditional_t<std::is_integral<Rep>::value && sizeof(Rep) < sizeof(int), |
| 798 | unsigned, typename make_unsigned_or_unchanged<Rep>::type>; |
| 799 | rep val; |
| 800 | using seconds = std::chrono::duration<rep>; |
| 801 | seconds s; |
| 802 | using milliseconds = std::chrono::duration<rep, std::milli>; |
| 803 | bool negative; |
| 804 | |
| 805 | using char_type = typename FormatContext::char_type; |
| 806 | |
| 807 | explicit chrono_formatter(FormatContext& ctx, OutputIt o, |
| 808 | std::chrono::duration<Rep, Period> d) |
| 809 | : context(ctx), |
| 810 | out(o), |
| 811 | val(static_cast<rep>(d.count())), |
| 812 | negative(false) { |
| 813 | if (d.count() < 0) { |
| 814 | val = 0 - val; |
| 815 | negative = true; |
| 816 | } |
| 817 | |
| 818 | // this may overflow and/or the result may not fit in the |
| 819 | // target type. |
| 820 | #if FMT_SAFE_DURATION_CAST |
| 821 | // might need checked conversion (rep!=Rep) |
| 822 | auto tmpval = std::chrono::duration<rep, Period>(val); |
| 823 | s = fmt_safe_duration_cast<seconds>(tmpval); |
| 824 | #else |
| 825 | s = std::chrono::duration_cast<seconds>( |
| 826 | std::chrono::duration<rep, Period>(val)); |
| 827 | #endif |
| 828 | } |
| 829 | |
| 830 | // returns true if nan or inf, writes to out. |
| 831 | bool handle_nan_inf() { |
| 832 | if (isfinite(val)) { |
| 833 | return false; |
| 834 | } |
| 835 | if (isnan(val)) { |
| 836 | write_nan(); |
| 837 | return true; |
| 838 | } |
| 839 | // must be +-inf |
| 840 | if (val > 0) { |
| 841 | write_pinf(); |
| 842 | } else { |
| 843 | write_ninf(); |
| 844 | } |
| 845 | return true; |
| 846 | } |
| 847 | |
| 848 | Rep hour() const { return static_cast<Rep>(mod((s.count() / 3600), 24)); } |
| 849 | |
| 850 | Rep hour12() const { |
| 851 | Rep hour = static_cast<Rep>(mod((s.count() / 3600), 12)); |
| 852 | return hour <= 0 ? 12 : hour; |
| 853 | } |
| 854 | |
| 855 | Rep minute() const { return static_cast<Rep>(mod((s.count() / 60), 60)); } |
| 856 | Rep second() const { return static_cast<Rep>(mod(s.count(), 60)); } |
| 857 | |
| 858 | std::tm time() const { |
| 859 | auto time = std::tm(); |
| 860 | time.tm_hour = to_nonnegative_int(hour(), 24); |
| 861 | time.tm_min = to_nonnegative_int(minute(), 60); |
| 862 | time.tm_sec = to_nonnegative_int(second(), 60); |
| 863 | return time; |
| 864 | } |
| 865 | |
| 866 | void write_sign() { |
| 867 | if (negative) { |
| 868 | *out++ = '-'; |
| 869 | negative = false; |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | void write(Rep value, int width) { |
| 874 | write_sign(); |
| 875 | if (isnan(value)) return write_nan(); |
| 876 | uint32_or_64_or_128_t<int> n = |
| 877 | to_unsigned(to_nonnegative_int(value, max_value<int>())); |
| 878 | int num_digits = detail::count_digits(n); |
| 879 | if (width > num_digits) out = std::fill_n(out, width - num_digits, '0'); |
| 880 | out = format_decimal<char_type>(out, n, num_digits).end; |
| 881 | } |
| 882 | |
| 883 | void write_nan() { std::copy_n("nan", 3, out); } |
| 884 | void write_pinf() { std::copy_n("inf", 3, out); } |
| 885 | void write_ninf() { std::copy_n("-inf", 4, out); } |
| 886 | |
| 887 | void format_localized(const tm& time, char format, char modifier = 0) { |
| 888 | if (isnan(val)) return write_nan(); |
| 889 | auto locale = context.locale().template get<std::locale>(); |
| 890 | auto& facet = std::use_facet<std::time_put<char_type>>(locale); |
| 891 | std::basic_ostringstream<char_type> os; |
| 892 | os.imbue(locale); |
| 893 | facet.put(os, os, ' ', &time, format, modifier); |
| 894 | auto str = os.str(); |
| 895 | std::copy(str.begin(), str.end(), out); |
| 896 | } |
| 897 | |
| 898 | void on_text(const char_type* begin, const char_type* end) { |
| 899 | std::copy(begin, end, out); |
| 900 | } |
| 901 | |
| 902 | // These are not implemented because durations don't have date information. |
| 903 | void on_abbr_weekday() {} |
| 904 | void on_full_weekday() {} |
| 905 | void on_dec0_weekday(numeric_system) {} |
| 906 | void on_dec1_weekday(numeric_system) {} |
| 907 | void on_abbr_month() {} |
| 908 | void on_full_month() {} |
| 909 | void on_datetime(numeric_system) {} |
| 910 | void on_loc_date(numeric_system) {} |
| 911 | void on_loc_time(numeric_system) {} |
| 912 | void on_us_date() {} |
| 913 | void on_iso_date() {} |
| 914 | void on_utc_offset() {} |
| 915 | void on_tz_name() {} |
| 916 | |
| 917 | void on_24_hour(numeric_system ns) { |
| 918 | if (handle_nan_inf()) return; |
| 919 | |
| 920 | if (ns == numeric_system::standard) return write(hour(), 2); |
| 921 | auto time = tm(); |
| 922 | time.tm_hour = to_nonnegative_int(hour(), 24); |
| 923 | format_localized(time, 'H', 'O'); |
| 924 | } |
| 925 | |
| 926 | void on_12_hour(numeric_system ns) { |
| 927 | if (handle_nan_inf()) return; |
| 928 | |
| 929 | if (ns == numeric_system::standard) return write(hour12(), 2); |
| 930 | auto time = tm(); |
| 931 | time.tm_hour = to_nonnegative_int(hour12(), 12); |
| 932 | format_localized(time, 'I', 'O'); |
| 933 | } |
| 934 | |
| 935 | void on_minute(numeric_system ns) { |
| 936 | if (handle_nan_inf()) return; |
| 937 | |
| 938 | if (ns == numeric_system::standard) return write(minute(), 2); |
| 939 | auto time = tm(); |
| 940 | time.tm_min = to_nonnegative_int(minute(), 60); |
| 941 | format_localized(time, 'M', 'O'); |
| 942 | } |
| 943 | |
| 944 | void on_second(numeric_system ns) { |
| 945 | if (handle_nan_inf()) return; |
| 946 | |
| 947 | if (ns == numeric_system::standard) { |
| 948 | write(second(), 2); |
| 949 | #if FMT_SAFE_DURATION_CAST |
| 950 | // convert rep->Rep |
| 951 | using duration_rep = std::chrono::duration<rep, Period>; |
| 952 | using duration_Rep = std::chrono::duration<Rep, Period>; |
| 953 | auto tmpval = fmt_safe_duration_cast<duration_Rep>(duration_rep{val}); |
| 954 | #else |
| 955 | auto tmpval = std::chrono::duration<Rep, Period>(val); |
| 956 | #endif |
| 957 | auto ms = get_milliseconds(tmpval); |
| 958 | if (ms != std::chrono::milliseconds(0)) { |
| 959 | *out++ = '.'; |
| 960 | write(ms.count(), 3); |
| 961 | } |
| 962 | return; |
| 963 | } |
| 964 | auto time = tm(); |
| 965 | time.tm_sec = to_nonnegative_int(second(), 60); |
| 966 | format_localized(time, 'S', 'O'); |
| 967 | } |
| 968 | |
| 969 | void on_12_hour_time() { |
| 970 | if (handle_nan_inf()) return; |
| 971 | format_localized(time(), 'r'); |
| 972 | } |
| 973 | |
| 974 | void on_24_hour_time() { |
| 975 | if (handle_nan_inf()) { |
| 976 | *out++ = ':'; |
| 977 | handle_nan_inf(); |
| 978 | return; |
| 979 | } |
| 980 | |
| 981 | write(hour(), 2); |
| 982 | *out++ = ':'; |
| 983 | write(minute(), 2); |
| 984 | } |
| 985 | |
| 986 | void on_iso_time() { |
| 987 | on_24_hour_time(); |
| 988 | *out++ = ':'; |
| 989 | if (handle_nan_inf()) return; |
| 990 | write(second(), 2); |
| 991 | } |
| 992 | |
| 993 | void on_am_pm() { |
| 994 | if (handle_nan_inf()) return; |
| 995 | format_localized(time(), 'p'); |
| 996 | } |
| 997 | |
| 998 | void on_duration_value() { |
| 999 | if (handle_nan_inf()) return; |
| 1000 | write_sign(); |
| 1001 | out = format_duration_value<char_type>(out, val, precision); |
| 1002 | } |
| 1003 | |
| 1004 | void on_duration_unit() { |
| 1005 | out = format_duration_unit<char_type, Period>(out); |
| 1006 | } |
| 1007 | }; |
| 1008 | } // namespace detail |
| 1009 | |
| 1010 | template <typename Rep, typename Period, typename Char> |
| 1011 | struct formatter<std::chrono::duration<Rep, Period>, Char> { |
| 1012 | private: |
| 1013 | basic_format_specs<Char> specs; |
| 1014 | int precision; |
| 1015 | using arg_ref_type = detail::arg_ref<Char>; |
| 1016 | arg_ref_type width_ref; |
| 1017 | arg_ref_type precision_ref; |
| 1018 | mutable basic_string_view<Char> format_str; |
| 1019 | using duration = std::chrono::duration<Rep, Period>; |
| 1020 | |
| 1021 | struct spec_handler { |
| 1022 | formatter& f; |
| 1023 | basic_format_parse_context<Char>& context; |
| 1024 | basic_string_view<Char> format_str; |
| 1025 | |
| 1026 | template <typename Id> FMT_CONSTEXPR arg_ref_type make_arg_ref(Id arg_id) { |
| 1027 | context.check_arg_id(arg_id); |
| 1028 | return arg_ref_type(arg_id); |
| 1029 | } |
| 1030 | |
| 1031 | FMT_CONSTEXPR arg_ref_type make_arg_ref(basic_string_view<Char> arg_id) { |
| 1032 | context.check_arg_id(arg_id); |
| 1033 | return arg_ref_type(arg_id); |
| 1034 | } |
| 1035 | |
| 1036 | FMT_CONSTEXPR arg_ref_type make_arg_ref(detail::auto_id) { |
| 1037 | return arg_ref_type(context.next_arg_id()); |
| 1038 | } |
| 1039 | |
| 1040 | void on_error(const char* msg) { FMT_THROW(format_error(msg)); } |
| 1041 | void on_fill(basic_string_view<Char> fill) { f.specs.fill = fill; } |
| 1042 | void on_align(align_t align) { f.specs.align = align; } |
| 1043 | void on_width(int width) { f.specs.width = width; } |
| 1044 | void on_precision(int _precision) { f.precision = _precision; } |
| 1045 | void end_precision() {} |
| 1046 | |
| 1047 | template <typename Id> void on_dynamic_width(Id arg_id) { |
| 1048 | f.width_ref = make_arg_ref(arg_id); |
| 1049 | } |
| 1050 | |
| 1051 | template <typename Id> void on_dynamic_precision(Id arg_id) { |
| 1052 | f.precision_ref = make_arg_ref(arg_id); |
| 1053 | } |
| 1054 | }; |
| 1055 | |
| 1056 | using iterator = typename basic_format_parse_context<Char>::iterator; |
| 1057 | struct parse_range { |
| 1058 | iterator begin; |
| 1059 | iterator end; |
| 1060 | }; |
| 1061 | |
| 1062 | FMT_CONSTEXPR parse_range do_parse(basic_format_parse_context<Char>& ctx) { |
| 1063 | auto begin = ctx.begin(), end = ctx.end(); |
| 1064 | if (begin == end || *begin == '}') return {begin, begin}; |
| 1065 | spec_handler handler{*this, ctx, format_str}; |
| 1066 | begin = detail::parse_align(begin, end, handler); |
| 1067 | if (begin == end) return {begin, begin}; |
| 1068 | begin = detail::parse_width(begin, end, handler); |
| 1069 | if (begin == end) return {begin, begin}; |
| 1070 | if (*begin == '.') { |
| 1071 | if (std::is_floating_point<Rep>::value) |
| 1072 | begin = detail::parse_precision(begin, end, handler); |
| 1073 | else |
| 1074 | handler.on_error("precision not allowed for this argument type"); |
| 1075 | } |
| 1076 | end = parse_chrono_format(begin, end, detail::chrono_format_checker()); |
| 1077 | return {begin, end}; |
| 1078 | } |
| 1079 | |
| 1080 | public: |
| 1081 | formatter() : precision(-1) {} |
| 1082 | |
| 1083 | FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx) |
| 1084 | -> decltype(ctx.begin()) { |
| 1085 | auto range = do_parse(ctx); |
| 1086 | format_str = basic_string_view<Char>( |
| 1087 | &*range.begin, detail::to_unsigned(range.end - range.begin)); |
| 1088 | return range.end; |
| 1089 | } |
| 1090 | |
| 1091 | template <typename FormatContext> |
| 1092 | auto format(const duration& d, FormatContext& ctx) -> decltype(ctx.out()) { |
| 1093 | auto begin = format_str.begin(), end = format_str.end(); |
| 1094 | // As a possible future optimization, we could avoid extra copying if width |
| 1095 | // is not specified. |
| 1096 | basic_memory_buffer<Char> buf; |
| 1097 | auto out = std::back_inserter(buf); |
| 1098 | detail::handle_dynamic_spec<detail::width_checker>(specs.width, width_ref, |
| 1099 | ctx); |
| 1100 | detail::handle_dynamic_spec<detail::precision_checker>(precision, |
| 1101 | precision_ref, ctx); |
| 1102 | if (begin == end || *begin == '}') { |
| 1103 | out = detail::format_duration_value<Char>(out, d.count(), precision); |
| 1104 | detail::format_duration_unit<Char, Period>(out); |
| 1105 | } else { |
| 1106 | detail::chrono_formatter<FormatContext, decltype(out), Rep, Period> f( |
| 1107 | ctx, out, d); |
| 1108 | f.precision = precision; |
| 1109 | parse_chrono_format(begin, end, f); |
| 1110 | } |
| 1111 | return detail::write( |
| 1112 | ctx.out(), basic_string_view<Char>(buf.data(), buf.size()), specs); |
| 1113 | } |
| 1114 | }; |
| 1115 | |
| 1116 | FMT_END_NAMESPACE |
| 1117 | |
| 1118 | #endif // FMT_CHRONO_H_ |