| 1 | /* |
| 2 | Formatting library for C++ |
| 3 | |
| 4 | Copyright (c) 2012 - present, Victor Zverovich |
| 5 | |
| 6 | Permission is hereby granted, free of charge, to any person obtaining |
| 7 | a copy of this software and associated documentation files (the |
| 8 | "Software"), to deal in the Software without restriction, including |
| 9 | without limitation the rights to use, copy, modify, merge, publish, |
| 10 | distribute, sublicense, and/or sell copies of the Software, and to |
| 11 | permit persons to whom the Software is furnished to do so, subject to |
| 12 | the following conditions: |
| 13 | |
| 14 | The above copyright notice and this permission notice shall be |
| 15 | included in all copies or substantial portions of the Software. |
| 16 | |
| 17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 18 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 19 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 20 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| 21 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| 22 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| 23 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 24 | |
| 25 | --- Optional exception to the license --- |
| 26 | |
| 27 | As an exception, if, as a result of your compiling your source code, portions |
| 28 | of this Software are embedded into a machine-executable object form of such |
| 29 | source code, you may redistribute such embedded portions in such object form |
| 30 | without including the above copyright and permission notices. |
| 31 | */ |
| 32 | |
| 33 | #ifndef FMT_FORMAT_H_ |
| 34 | #define FMT_FORMAT_H_ |
| 35 | |
| 36 | #include <cmath> // std::signbit |
| 37 | #include <cstdint> // uint32_t |
| 38 | #include <limits> // std::numeric_limits |
| 39 | #include <memory> // std::uninitialized_copy |
| 40 | #include <stdexcept> // std::runtime_error |
| 41 | #include <system_error> // std::system_error |
| 42 | #include <utility> // std::swap |
| 43 | |
| 44 | #ifdef __cpp_lib_bit_cast |
| 45 | # include <bit> // std::bitcast |
| 46 | #endif |
| 47 | |
| 48 | #include "core.h" |
| 49 | |
| 50 | #if FMT_GCC_VERSION |
| 51 | # define FMT_GCC_VISIBILITY_HIDDEN __attribute__((visibility("hidden"))) |
| 52 | #else |
| 53 | # define FMT_GCC_VISIBILITY_HIDDEN |
| 54 | #endif |
| 55 | |
| 56 | #ifdef __NVCC__ |
| 57 | # define FMT_CUDA_VERSION (__CUDACC_VER_MAJOR__ * 100 + __CUDACC_VER_MINOR__) |
| 58 | #else |
| 59 | # define FMT_CUDA_VERSION 0 |
| 60 | #endif |
| 61 | |
| 62 | #ifdef __has_builtin |
| 63 | # define FMT_HAS_BUILTIN(x) __has_builtin(x) |
| 64 | #else |
| 65 | # define FMT_HAS_BUILTIN(x) 0 |
| 66 | #endif |
| 67 | |
| 68 | #if FMT_GCC_VERSION || FMT_CLANG_VERSION |
| 69 | # define FMT_NOINLINE __attribute__((noinline)) |
| 70 | #else |
| 71 | # define FMT_NOINLINE |
| 72 | #endif |
| 73 | |
| 74 | #if FMT_MSC_VER |
| 75 | # define FMT_MSC_DEFAULT = default |
| 76 | #else |
| 77 | # define FMT_MSC_DEFAULT |
| 78 | #endif |
| 79 | |
| 80 | #ifndef FMT_THROW |
| 81 | # if FMT_EXCEPTIONS |
| 82 | # if FMT_MSC_VER || FMT_NVCC |
| 83 | FMT_BEGIN_NAMESPACE |
| 84 | namespace detail { |
| 85 | template <typename Exception> inline void do_throw(const Exception& x) { |
| 86 | // Silence unreachable code warnings in MSVC and NVCC because these |
| 87 | // are nearly impossible to fix in a generic code. |
| 88 | volatile bool b = true; |
| 89 | if (b) throw x; |
| 90 | } |
| 91 | } // namespace detail |
| 92 | FMT_END_NAMESPACE |
| 93 | # define FMT_THROW(x) detail::do_throw(x) |
| 94 | # else |
| 95 | # define FMT_THROW(x) throw x |
| 96 | # endif |
| 97 | # else |
| 98 | # define FMT_THROW(x) \ |
| 99 | do { \ |
| 100 | FMT_ASSERT(false, (x).what()); \ |
| 101 | } while (false) |
| 102 | # endif |
| 103 | #endif |
| 104 | |
| 105 | #if FMT_EXCEPTIONS |
| 106 | # define FMT_TRY try |
| 107 | # define FMT_CATCH(x) catch (x) |
| 108 | #else |
| 109 | # define FMT_TRY if (true) |
| 110 | # define FMT_CATCH(x) if (false) |
| 111 | #endif |
| 112 | |
| 113 | #ifndef FMT_MAYBE_UNUSED |
| 114 | # if FMT_HAS_CPP17_ATTRIBUTE(maybe_unused) |
| 115 | # define FMT_MAYBE_UNUSED [[maybe_unused]] |
| 116 | # else |
| 117 | # define FMT_MAYBE_UNUSED |
| 118 | # endif |
| 119 | #endif |
| 120 | |
| 121 | // Workaround broken [[deprecated]] in the Intel, PGI and NVCC compilers. |
| 122 | #if FMT_ICC_VERSION || defined(__PGI) || FMT_NVCC |
| 123 | # define FMT_DEPRECATED_ALIAS |
| 124 | #else |
| 125 | # define FMT_DEPRECATED_ALIAS FMT_DEPRECATED |
| 126 | #endif |
| 127 | |
| 128 | #ifndef FMT_USE_USER_DEFINED_LITERALS |
| 129 | // EDG based compilers (Intel, NVIDIA, Elbrus, etc), GCC and MSVC support UDLs. |
| 130 | # if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 407 || \ |
| 131 | FMT_MSC_VER >= 1900) && \ |
| 132 | (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= /* UDL feature */ 480) |
| 133 | # define FMT_USE_USER_DEFINED_LITERALS 1 |
| 134 | # else |
| 135 | # define FMT_USE_USER_DEFINED_LITERALS 0 |
| 136 | # endif |
| 137 | #endif |
| 138 | |
| 139 | // Defining FMT_REDUCE_INT_INSTANTIATIONS to 1, will reduce the number of |
| 140 | // integer formatter template instantiations to just one by only using the |
| 141 | // largest integer type. This results in a reduction in binary size but will |
| 142 | // cause a decrease in integer formatting performance. |
| 143 | #if !defined(FMT_REDUCE_INT_INSTANTIATIONS) |
| 144 | # define FMT_REDUCE_INT_INSTANTIATIONS 0 |
| 145 | #endif |
| 146 | |
| 147 | // __builtin_clz is broken in clang with Microsoft CodeGen: |
| 148 | // https://github.com/fmtlib/fmt/issues/519. |
| 149 | #if !FMT_MSC_VER |
| 150 | # if FMT_HAS_BUILTIN(__builtin_clz) || FMT_GCC_VERSION || FMT_ICC_VERSION |
| 151 | # define FMT_BUILTIN_CLZ(n) __builtin_clz(n) |
| 152 | # endif |
| 153 | # if FMT_HAS_BUILTIN(__builtin_clzll) || FMT_GCC_VERSION || FMT_ICC_VERSION |
| 154 | # define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n) |
| 155 | # endif |
| 156 | #endif |
| 157 | |
| 158 | // __builtin_ctz is broken in Intel Compiler Classic on Windows: |
| 159 | // https://github.com/fmtlib/fmt/issues/2510. |
| 160 | #ifndef __ICL |
| 161 | # if FMT_HAS_BUILTIN(__builtin_ctz) || FMT_GCC_VERSION || FMT_ICC_VERSION |
| 162 | # define FMT_BUILTIN_CTZ(n) __builtin_ctz(n) |
| 163 | # endif |
| 164 | # if FMT_HAS_BUILTIN(__builtin_ctzll) || FMT_GCC_VERSION || FMT_ICC_VERSION |
| 165 | # define FMT_BUILTIN_CTZLL(n) __builtin_ctzll(n) |
| 166 | # endif |
| 167 | #endif |
| 168 | |
| 169 | #if FMT_MSC_VER |
| 170 | # include <intrin.h> // _BitScanReverse[64], _BitScanForward[64], _umul128 |
| 171 | #endif |
| 172 | |
| 173 | // Some compilers masquerade as both MSVC and GCC-likes or otherwise support |
| 174 | // __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the |
| 175 | // MSVC intrinsics if the clz and clzll builtins are not available. |
| 176 | #if FMT_MSC_VER && !defined(FMT_BUILTIN_CLZLL) && !defined(FMT_BUILTIN_CTZLL) |
| 177 | FMT_BEGIN_NAMESPACE |
| 178 | namespace detail { |
| 179 | // Avoid Clang with Microsoft CodeGen's -Wunknown-pragmas warning. |
| 180 | # if !defined(__clang__) |
| 181 | # pragma intrinsic(_BitScanForward) |
| 182 | # pragma intrinsic(_BitScanReverse) |
| 183 | # if defined(_WIN64) |
| 184 | # pragma intrinsic(_BitScanForward64) |
| 185 | # pragma intrinsic(_BitScanReverse64) |
| 186 | # endif |
| 187 | # endif |
| 188 | |
| 189 | inline auto clz(uint32_t x) -> int { |
| 190 | unsigned long r = 0; |
| 191 | _BitScanReverse(&r, x); |
| 192 | FMT_ASSERT(x != 0, ""); |
| 193 | // Static analysis complains about using uninitialized data |
| 194 | // "r", but the only way that can happen is if "x" is 0, |
| 195 | // which the callers guarantee to not happen. |
| 196 | FMT_MSC_WARNING(suppress : 6102) |
| 197 | return 31 ^ static_cast<int>(r); |
| 198 | } |
| 199 | # define FMT_BUILTIN_CLZ(n) detail::clz(n) |
| 200 | |
| 201 | inline auto clzll(uint64_t x) -> int { |
| 202 | unsigned long r = 0; |
| 203 | # ifdef _WIN64 |
| 204 | _BitScanReverse64(&r, x); |
| 205 | # else |
| 206 | // Scan the high 32 bits. |
| 207 | if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32))) return 63 ^ (r + 32); |
| 208 | // Scan the low 32 bits. |
| 209 | _BitScanReverse(&r, static_cast<uint32_t>(x)); |
| 210 | # endif |
| 211 | FMT_ASSERT(x != 0, ""); |
| 212 | FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning. |
| 213 | return 63 ^ static_cast<int>(r); |
| 214 | } |
| 215 | # define FMT_BUILTIN_CLZLL(n) detail::clzll(n) |
| 216 | |
| 217 | inline auto ctz(uint32_t x) -> int { |
| 218 | unsigned long r = 0; |
| 219 | _BitScanForward(&r, x); |
| 220 | FMT_ASSERT(x != 0, ""); |
| 221 | FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning. |
| 222 | return static_cast<int>(r); |
| 223 | } |
| 224 | # define FMT_BUILTIN_CTZ(n) detail::ctz(n) |
| 225 | |
| 226 | inline auto ctzll(uint64_t x) -> int { |
| 227 | unsigned long r = 0; |
| 228 | FMT_ASSERT(x != 0, ""); |
| 229 | FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning. |
| 230 | # ifdef _WIN64 |
| 231 | _BitScanForward64(&r, x); |
| 232 | # else |
| 233 | // Scan the low 32 bits. |
| 234 | if (_BitScanForward(&r, static_cast<uint32_t>(x))) return static_cast<int>(r); |
| 235 | // Scan the high 32 bits. |
| 236 | _BitScanForward(&r, static_cast<uint32_t>(x >> 32)); |
| 237 | r += 32; |
| 238 | # endif |
| 239 | return static_cast<int>(r); |
| 240 | } |
| 241 | # define FMT_BUILTIN_CTZLL(n) detail::ctzll(n) |
| 242 | } // namespace detail |
| 243 | FMT_END_NAMESPACE |
| 244 | #endif |
| 245 | |
| 246 | #ifdef FMT_HEADER_ONLY |
| 247 | # define FMT_HEADER_ONLY_CONSTEXPR20 FMT_CONSTEXPR20 |
| 248 | #else |
| 249 | # define FMT_HEADER_ONLY_CONSTEXPR20 |
| 250 | #endif |
| 251 | |
| 252 | FMT_BEGIN_NAMESPACE |
| 253 | namespace detail { |
| 254 | |
| 255 | template <typename Streambuf> class formatbuf : public Streambuf { |
| 256 | private: |
| 257 | using char_type = typename Streambuf::char_type; |
| 258 | using streamsize = decltype(std::declval<Streambuf>().sputn(nullptr, 0)); |
| 259 | using int_type = typename Streambuf::int_type; |
| 260 | using traits_type = typename Streambuf::traits_type; |
| 261 | |
| 262 | buffer<char_type>& buffer_; |
| 263 | |
| 264 | public: |
| 265 | explicit formatbuf(buffer<char_type>& buf) : buffer_(buf) {} |
| 266 | |
| 267 | protected: |
| 268 | // The put area is always empty. This makes the implementation simpler and has |
| 269 | // the advantage that the streambuf and the buffer are always in sync and |
| 270 | // sputc never writes into uninitialized memory. A disadvantage is that each |
| 271 | // call to sputc always results in a (virtual) call to overflow. There is no |
| 272 | // disadvantage here for sputn since this always results in a call to xsputn. |
| 273 | |
| 274 | auto overflow(int_type ch) -> int_type override { |
| 275 | if (!traits_type::eq_int_type(ch, traits_type::eof())) |
| 276 | buffer_.push_back(static_cast<char_type>(ch)); |
| 277 | return ch; |
| 278 | } |
| 279 | |
| 280 | auto xsputn(const char_type* s, streamsize count) -> streamsize override { |
| 281 | buffer_.append(s, s + count); |
| 282 | return count; |
| 283 | } |
| 284 | }; |
| 285 | |
| 286 | // Implementation of std::bit_cast for pre-C++20. |
| 287 | template <typename To, typename From> |
| 288 | FMT_CONSTEXPR20 auto bit_cast(const From& from) -> To { |
| 289 | static_assert(sizeof(To) == sizeof(From), "size mismatch"); |
| 290 | #ifdef __cpp_lib_bit_cast |
| 291 | if (is_constant_evaluated()) return std::bit_cast<To>(from); |
| 292 | #endif |
| 293 | auto to = To(); |
| 294 | std::memcpy(&to, &from, sizeof(to)); |
| 295 | return to; |
| 296 | } |
| 297 | |
| 298 | inline auto is_big_endian() -> bool { |
| 299 | #ifdef _WIN32 |
| 300 | return false; |
| 301 | #elif defined(__BIG_ENDIAN__) |
| 302 | return true; |
| 303 | #elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) |
| 304 | return __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__; |
| 305 | #else |
| 306 | struct bytes { |
| 307 | char data[sizeof(int)]; |
| 308 | }; |
| 309 | return bit_cast<bytes>(1).data[0] == 0; |
| 310 | #endif |
| 311 | } |
| 312 | |
| 313 | // A fallback implementation of uintptr_t for systems that lack it. |
| 314 | struct fallback_uintptr { |
| 315 | unsigned char value[sizeof(void*)]; |
| 316 | |
| 317 | fallback_uintptr() = default; |
| 318 | explicit fallback_uintptr(const void* p) { |
| 319 | *this = bit_cast<fallback_uintptr>(p); |
| 320 | if (const_check(is_big_endian())) { |
| 321 | for (size_t i = 0, j = sizeof(void*) - 1; i < j; ++i, --j) |
| 322 | std::swap(value[i], value[j]); |
| 323 | } |
| 324 | } |
| 325 | }; |
| 326 | #ifdef UINTPTR_MAX |
| 327 | using uintptr_t = ::uintptr_t; |
| 328 | inline auto to_uintptr(const void* p) -> uintptr_t { |
| 329 | return bit_cast<uintptr_t>(p); |
| 330 | } |
| 331 | #else |
| 332 | using uintptr_t = fallback_uintptr; |
| 333 | inline auto to_uintptr(const void* p) -> fallback_uintptr { |
| 334 | return fallback_uintptr(p); |
| 335 | } |
| 336 | #endif |
| 337 | |
| 338 | // Returns the largest possible value for type T. Same as |
| 339 | // std::numeric_limits<T>::max() but shorter and not affected by the max macro. |
| 340 | template <typename T> constexpr auto max_value() -> T { |
| 341 | return (std::numeric_limits<T>::max)(); |
| 342 | } |
| 343 | template <typename T> constexpr auto num_bits() -> int { |
| 344 | return std::numeric_limits<T>::digits; |
| 345 | } |
| 346 | // std::numeric_limits<T>::digits may return 0 for 128-bit ints. |
| 347 | template <> constexpr auto num_bits<int128_t>() -> int { return 128; } |
| 348 | template <> constexpr auto num_bits<uint128_t>() -> int { return 128; } |
| 349 | template <> constexpr auto num_bits<fallback_uintptr>() -> int { |
| 350 | return static_cast<int>(sizeof(void*) * |
| 351 | std::numeric_limits<unsigned char>::digits); |
| 352 | } |
| 353 | |
| 354 | FMT_INLINE void assume(bool condition) { |
| 355 | (void)condition; |
| 356 | #if FMT_HAS_BUILTIN(__builtin_assume) |
| 357 | __builtin_assume(condition); |
| 358 | #endif |
| 359 | } |
| 360 | |
| 361 | // An approximation of iterator_t for pre-C++20 systems. |
| 362 | template <typename T> |
| 363 | using iterator_t = decltype(std::begin(std::declval<T&>())); |
| 364 | template <typename T> using sentinel_t = decltype(std::end(std::declval<T&>())); |
| 365 | |
| 366 | // A workaround for std::string not having mutable data() until C++17. |
| 367 | template <typename Char> |
| 368 | inline auto get_data(std::basic_string<Char>& s) -> Char* { |
| 369 | return &s[0]; |
| 370 | } |
| 371 | template <typename Container> |
| 372 | inline auto get_data(Container& c) -> typename Container::value_type* { |
| 373 | return c.data(); |
| 374 | } |
| 375 | |
| 376 | #if defined(_SECURE_SCL) && _SECURE_SCL |
| 377 | // Make a checked iterator to avoid MSVC warnings. |
| 378 | template <typename T> using checked_ptr = stdext::checked_array_iterator<T*>; |
| 379 | template <typename T> |
| 380 | constexpr auto make_checked(T* p, size_t size) -> checked_ptr<T> { |
| 381 | return {p, size}; |
| 382 | } |
| 383 | #else |
| 384 | template <typename T> using checked_ptr = T*; |
| 385 | template <typename T> constexpr auto make_checked(T* p, size_t) -> T* { |
| 386 | return p; |
| 387 | } |
| 388 | #endif |
| 389 | |
| 390 | // Attempts to reserve space for n extra characters in the output range. |
| 391 | // Returns a pointer to the reserved range or a reference to it. |
| 392 | template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)> |
| 393 | #if FMT_CLANG_VERSION >= 307 && !FMT_ICC_VERSION |
| 394 | __attribute__((no_sanitize("undefined"))) |
| 395 | #endif |
| 396 | inline auto |
| 397 | reserve(std::back_insert_iterator<Container> it, size_t n) |
| 398 | -> checked_ptr<typename Container::value_type> { |
| 399 | Container& c = get_container(it); |
| 400 | size_t size = c.size(); |
| 401 | c.resize(size + n); |
| 402 | return make_checked(get_data(c) + size, n); |
| 403 | } |
| 404 | |
| 405 | template <typename T> |
| 406 | inline auto reserve(buffer_appender<T> it, size_t n) -> buffer_appender<T> { |
| 407 | buffer<T>& buf = get_container(it); |
| 408 | buf.try_reserve(buf.size() + n); |
| 409 | return it; |
| 410 | } |
| 411 | |
| 412 | template <typename Iterator> |
| 413 | constexpr auto reserve(Iterator& it, size_t) -> Iterator& { |
| 414 | return it; |
| 415 | } |
| 416 | |
| 417 | template <typename OutputIt> |
| 418 | using reserve_iterator = |
| 419 | remove_reference_t<decltype(reserve(std::declval<OutputIt&>(), 0))>; |
| 420 | |
| 421 | template <typename T, typename OutputIt> |
| 422 | constexpr auto to_pointer(OutputIt, size_t) -> T* { |
| 423 | return nullptr; |
| 424 | } |
| 425 | template <typename T> auto to_pointer(buffer_appender<T> it, size_t n) -> T* { |
| 426 | buffer<T>& buf = get_container(it); |
| 427 | auto size = buf.size(); |
| 428 | if (buf.capacity() < size + n) return nullptr; |
| 429 | buf.try_resize(size + n); |
| 430 | return buf.data() + size; |
| 431 | } |
| 432 | |
| 433 | template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)> |
| 434 | inline auto base_iterator(std::back_insert_iterator<Container>& it, |
| 435 | checked_ptr<typename Container::value_type>) |
| 436 | -> std::back_insert_iterator<Container> { |
| 437 | return it; |
| 438 | } |
| 439 | |
| 440 | template <typename Iterator> |
| 441 | constexpr auto base_iterator(Iterator, Iterator it) -> Iterator { |
| 442 | return it; |
| 443 | } |
| 444 | |
| 445 | // <algorithm> is spectacularly slow to compile in C++20 so use a simple fill_n |
| 446 | // instead (#1998). |
| 447 | template <typename OutputIt, typename Size, typename T> |
| 448 | FMT_CONSTEXPR auto fill_n(OutputIt out, Size count, const T& value) |
| 449 | -> OutputIt { |
| 450 | for (Size i = 0; i < count; ++i) *out++ = value; |
| 451 | return out; |
| 452 | } |
| 453 | template <typename T, typename Size> |
| 454 | FMT_CONSTEXPR20 auto fill_n(T* out, Size count, char value) -> T* { |
| 455 | if (is_constant_evaluated()) { |
| 456 | return fill_n<T*, Size, T>(out, count, value); |
| 457 | } |
| 458 | std::memset(out, value, to_unsigned(count)); |
| 459 | return out + count; |
| 460 | } |
| 461 | |
| 462 | #ifdef __cpp_char8_t |
| 463 | using char8_type = char8_t; |
| 464 | #else |
| 465 | enum char8_type : unsigned char {}; |
| 466 | #endif |
| 467 | |
| 468 | template <typename OutChar, typename InputIt, typename OutputIt> |
| 469 | FMT_CONSTEXPR FMT_NOINLINE auto copy_str_noinline(InputIt begin, InputIt end, |
| 470 | OutputIt out) -> OutputIt { |
| 471 | return copy_str<OutChar>(begin, end, out); |
| 472 | } |
| 473 | |
| 474 | // A public domain branchless UTF-8 decoder by Christopher Wellons: |
| 475 | // https://github.com/skeeto/branchless-utf8 |
| 476 | /* Decode the next character, c, from s, reporting errors in e. |
| 477 | * |
| 478 | * Since this is a branchless decoder, four bytes will be read from the |
| 479 | * buffer regardless of the actual length of the next character. This |
| 480 | * means the buffer _must_ have at least three bytes of zero padding |
| 481 | * following the end of the data stream. |
| 482 | * |
| 483 | * Errors are reported in e, which will be non-zero if the parsed |
| 484 | * character was somehow invalid: invalid byte sequence, non-canonical |
| 485 | * encoding, or a surrogate half. |
| 486 | * |
| 487 | * The function returns a pointer to the next character. When an error |
| 488 | * occurs, this pointer will be a guess that depends on the particular |
| 489 | * error, but it will always advance at least one byte. |
| 490 | */ |
| 491 | FMT_CONSTEXPR inline auto utf8_decode(const char* s, uint32_t* c, int* e) |
| 492 | -> const char* { |
| 493 | constexpr const int masks[] = {0x00, 0x7f, 0x1f, 0x0f, 0x07}; |
| 494 | constexpr const uint32_t mins[] = {4194304, 0, 128, 2048, 65536}; |
| 495 | constexpr const int shiftc[] = {0, 18, 12, 6, 0}; |
| 496 | constexpr const int shifte[] = {0, 6, 4, 2, 0}; |
| 497 | |
| 498 | int len = code_point_length(s); |
| 499 | const char* next = s + len; |
| 500 | |
| 501 | // Assume a four-byte character and load four bytes. Unused bits are |
| 502 | // shifted out. |
| 503 | *c = uint32_t(s[0] & masks[len]) << 18; |
| 504 | *c |= uint32_t(s[1] & 0x3f) << 12; |
| 505 | *c |= uint32_t(s[2] & 0x3f) << 6; |
| 506 | *c |= uint32_t(s[3] & 0x3f) << 0; |
| 507 | *c >>= shiftc[len]; |
| 508 | |
| 509 | // Accumulate the various error conditions. |
| 510 | using uchar = unsigned char; |
| 511 | *e = (*c < mins[len]) << 6; // non-canonical encoding |
| 512 | *e |= ((*c >> 11) == 0x1b) << 7; // surrogate half? |
| 513 | *e |= (*c > 0x10FFFF) << 8; // out of range? |
| 514 | *e |= (uchar(s[1]) & 0xc0) >> 2; |
| 515 | *e |= (uchar(s[2]) & 0xc0) >> 4; |
| 516 | *e |= uchar(s[3]) >> 6; |
| 517 | *e ^= 0x2a; // top two bits of each tail byte correct? |
| 518 | *e >>= shifte[len]; |
| 519 | |
| 520 | return next; |
| 521 | } |
| 522 | |
| 523 | constexpr uint32_t invalid_code_point = ~uint32_t(); |
| 524 | |
| 525 | // Invokes f(cp, sv) for every code point cp in s with sv being the string view |
| 526 | // corresponding to the code point. cp is invalid_code_point on error. |
| 527 | template <typename F> |
| 528 | FMT_CONSTEXPR void for_each_codepoint(string_view s, F f) { |
| 529 | auto decode = [f](const char* buf_ptr, const char* ptr) { |
| 530 | auto cp = uint32_t(); |
| 531 | auto error = 0; |
| 532 | auto end = utf8_decode(buf_ptr, &cp, &error); |
| 533 | bool result = f(error ? invalid_code_point : cp, |
| 534 | string_view(ptr, to_unsigned(end - buf_ptr))); |
| 535 | return result ? end : nullptr; |
| 536 | }; |
| 537 | auto p = s.data(); |
| 538 | const size_t block_size = 4; // utf8_decode always reads blocks of 4 chars. |
| 539 | if (s.size() >= block_size) { |
| 540 | for (auto end = p + s.size() - block_size + 1; p < end;) { |
| 541 | p = decode(p, p); |
| 542 | if (!p) return; |
| 543 | } |
| 544 | } |
| 545 | if (auto num_chars_left = s.data() + s.size() - p) { |
| 546 | char buf[2 * block_size - 1] = {}; |
| 547 | copy_str<char>(p, p + num_chars_left, buf); |
| 548 | const char* buf_ptr = buf; |
| 549 | do { |
| 550 | auto end = decode(buf_ptr, p); |
| 551 | if (!end) return; |
| 552 | p += end - buf_ptr; |
| 553 | buf_ptr = end; |
| 554 | } while (buf_ptr - buf < num_chars_left); |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | template <typename Char> |
| 559 | inline auto compute_width(basic_string_view<Char> s) -> size_t { |
| 560 | return s.size(); |
| 561 | } |
| 562 | |
| 563 | // Computes approximate display width of a UTF-8 string. |
| 564 | FMT_CONSTEXPR inline size_t compute_width(string_view s) { |
| 565 | size_t num_code_points = 0; |
| 566 | // It is not a lambda for compatibility with C++14. |
| 567 | struct count_code_points { |
| 568 | size_t* count; |
| 569 | FMT_CONSTEXPR auto operator()(uint32_t cp, string_view) const -> bool { |
| 570 | *count += detail::to_unsigned( |
| 571 | 1 + |
| 572 | (cp >= 0x1100 && |
| 573 | (cp <= 0x115f || // Hangul Jamo init. consonants |
| 574 | cp == 0x2329 || // LEFT-POINTING ANGLE BRACKET |
| 575 | cp == 0x232a || // RIGHT-POINTING ANGLE BRACKET |
| 576 | // CJK ... Yi except IDEOGRAPHIC HALF FILL SPACE: |
| 577 | (cp >= 0x2e80 && cp <= 0xa4cf && cp != 0x303f) || |
| 578 | (cp >= 0xac00 && cp <= 0xd7a3) || // Hangul Syllables |
| 579 | (cp >= 0xf900 && cp <= 0xfaff) || // CJK Compatibility Ideographs |
| 580 | (cp >= 0xfe10 && cp <= 0xfe19) || // Vertical Forms |
| 581 | (cp >= 0xfe30 && cp <= 0xfe6f) || // CJK Compatibility Forms |
| 582 | (cp >= 0xff00 && cp <= 0xff60) || // Fullwidth Forms |
| 583 | (cp >= 0xffe0 && cp <= 0xffe6) || // Fullwidth Forms |
| 584 | (cp >= 0x20000 && cp <= 0x2fffd) || // CJK |
| 585 | (cp >= 0x30000 && cp <= 0x3fffd) || |
| 586 | // Miscellaneous Symbols and Pictographs + Emoticons: |
| 587 | (cp >= 0x1f300 && cp <= 0x1f64f) || |
| 588 | // Supplemental Symbols and Pictographs: |
| 589 | (cp >= 0x1f900 && cp <= 0x1f9ff)))); |
| 590 | return true; |
| 591 | } |
| 592 | }; |
| 593 | for_each_codepoint(s, count_code_points{&num_code_points}); |
| 594 | return num_code_points; |
| 595 | } |
| 596 | |
| 597 | inline auto compute_width(basic_string_view<char8_type> s) -> size_t { |
| 598 | return compute_width(basic_string_view<char>( |
| 599 | reinterpret_cast<const char*>(s.data()), s.size())); |
| 600 | } |
| 601 | |
| 602 | template <typename Char> |
| 603 | inline auto code_point_index(basic_string_view<Char> s, size_t n) -> size_t { |
| 604 | size_t size = s.size(); |
| 605 | return n < size ? n : size; |
| 606 | } |
| 607 | |
| 608 | // Calculates the index of the nth code point in a UTF-8 string. |
| 609 | inline auto code_point_index(basic_string_view<char8_type> s, size_t n) |
| 610 | -> size_t { |
| 611 | const char8_type* data = s.data(); |
| 612 | size_t num_code_points = 0; |
| 613 | for (size_t i = 0, size = s.size(); i != size; ++i) { |
| 614 | if ((data[i] & 0xc0) != 0x80 && ++num_code_points > n) return i; |
| 615 | } |
| 616 | return s.size(); |
| 617 | } |
| 618 | |
| 619 | template <typename T, bool = std::is_floating_point<T>::value> |
| 620 | struct is_fast_float : bool_constant<std::numeric_limits<T>::is_iec559 && |
| 621 | sizeof(T) <= sizeof(double)> {}; |
| 622 | template <typename T> struct is_fast_float<T, false> : std::false_type {}; |
| 623 | |
| 624 | #ifndef FMT_USE_FULL_CACHE_DRAGONBOX |
| 625 | # define FMT_USE_FULL_CACHE_DRAGONBOX 0 |
| 626 | #endif |
| 627 | |
| 628 | template <typename T> |
| 629 | template <typename U> |
| 630 | void buffer<T>::append(const U* begin, const U* end) { |
| 631 | while (begin != end) { |
| 632 | auto count = to_unsigned(end - begin); |
| 633 | try_reserve(size_ + count); |
| 634 | auto free_cap = capacity_ - size_; |
| 635 | if (free_cap < count) count = free_cap; |
| 636 | std::uninitialized_copy_n(begin, count, make_checked(ptr_ + size_, count)); |
| 637 | size_ += count; |
| 638 | begin += count; |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | template <typename T, typename Enable = void> |
| 643 | struct is_locale : std::false_type {}; |
| 644 | template <typename T> |
| 645 | struct is_locale<T, void_t<decltype(T::classic())>> : std::true_type {}; |
| 646 | } // namespace detail |
| 647 | |
| 648 | FMT_MODULE_EXPORT_BEGIN |
| 649 | |
| 650 | // The number of characters to store in the basic_memory_buffer object itself |
| 651 | // to avoid dynamic memory allocation. |
| 652 | enum { inline_buffer_size = 500 }; |
| 653 | |
| 654 | /** |
| 655 | \rst |
| 656 | A dynamically growing memory buffer for trivially copyable/constructible types |
| 657 | with the first ``SIZE`` elements stored in the object itself. |
| 658 | |
| 659 | You can use the ``memory_buffer`` type alias for ``char`` instead. |
| 660 | |
| 661 | **Example**:: |
| 662 | |
| 663 | auto out = fmt::memory_buffer(); |
| 664 | format_to(std::back_inserter(out), "The answer is {}.", 42); |
| 665 | |
| 666 | This will append the following output to the ``out`` object: |
| 667 | |
| 668 | .. code-block:: none |
| 669 | |
| 670 | The answer is 42. |
| 671 | |
| 672 | The output can be converted to an ``std::string`` with ``to_string(out)``. |
| 673 | \endrst |
| 674 | */ |
| 675 | template <typename T, size_t SIZE = inline_buffer_size, |
| 676 | typename Allocator = std::allocator<T>> |
| 677 | class basic_memory_buffer final : public detail::buffer<T> { |
| 678 | private: |
| 679 | T store_[SIZE]; |
| 680 | |
| 681 | // Don't inherit from Allocator avoid generating type_info for it. |
| 682 | Allocator alloc_; |
| 683 | |
| 684 | // Deallocate memory allocated by the buffer. |
| 685 | FMT_CONSTEXPR20 void deallocate() { |
| 686 | T* data = this->data(); |
| 687 | if (data != store_) alloc_.deallocate(data, this->capacity()); |
| 688 | } |
| 689 | |
| 690 | protected: |
| 691 | FMT_CONSTEXPR20 void grow(size_t size) override; |
| 692 | |
| 693 | public: |
| 694 | using value_type = T; |
| 695 | using const_reference = const T&; |
| 696 | |
| 697 | FMT_CONSTEXPR20 explicit basic_memory_buffer( |
| 698 | const Allocator& alloc = Allocator()) |
| 699 | : alloc_(alloc) { |
| 700 | this->set(store_, SIZE); |
| 701 | if (detail::is_constant_evaluated()) { |
| 702 | detail::fill_n(store_, SIZE, T{}); |
| 703 | } |
| 704 | } |
| 705 | FMT_CONSTEXPR20 ~basic_memory_buffer() { deallocate(); } |
| 706 | |
| 707 | private: |
| 708 | // Move data from other to this buffer. |
| 709 | FMT_CONSTEXPR20 void move(basic_memory_buffer& other) { |
| 710 | alloc_ = std::move(other.alloc_); |
| 711 | T* data = other.data(); |
| 712 | size_t size = other.size(), capacity = other.capacity(); |
| 713 | if (data == other.store_) { |
| 714 | this->set(store_, capacity); |
| 715 | if (detail::is_constant_evaluated()) { |
| 716 | detail::copy_str<T>(other.store_, other.store_ + size, |
| 717 | detail::make_checked(store_, capacity)); |
| 718 | } else { |
| 719 | std::uninitialized_copy(other.store_, other.store_ + size, |
| 720 | detail::make_checked(store_, capacity)); |
| 721 | } |
| 722 | } else { |
| 723 | this->set(data, capacity); |
| 724 | // Set pointer to the inline array so that delete is not called |
| 725 | // when deallocating. |
| 726 | other.set(other.store_, 0); |
| 727 | } |
| 728 | this->resize(size); |
| 729 | } |
| 730 | |
| 731 | public: |
| 732 | /** |
| 733 | \rst |
| 734 | Constructs a :class:`fmt::basic_memory_buffer` object moving the content |
| 735 | of the other object to it. |
| 736 | \endrst |
| 737 | */ |
| 738 | FMT_CONSTEXPR20 basic_memory_buffer(basic_memory_buffer&& other) |
| 739 | FMT_NOEXCEPT { |
| 740 | move(other); |
| 741 | } |
| 742 | |
| 743 | /** |
| 744 | \rst |
| 745 | Moves the content of the other ``basic_memory_buffer`` object to this one. |
| 746 | \endrst |
| 747 | */ |
| 748 | auto operator=(basic_memory_buffer&& other) FMT_NOEXCEPT |
| 749 | -> basic_memory_buffer& { |
| 750 | FMT_ASSERT(this != &other, ""); |
| 751 | deallocate(); |
| 752 | move(other); |
| 753 | return *this; |
| 754 | } |
| 755 | |
| 756 | // Returns a copy of the allocator associated with this buffer. |
| 757 | auto get_allocator() const -> Allocator { return alloc_; } |
| 758 | |
| 759 | /** |
| 760 | Resizes the buffer to contain *count* elements. If T is a POD type new |
| 761 | elements may not be initialized. |
| 762 | */ |
| 763 | FMT_CONSTEXPR20 void resize(size_t count) { this->try_resize(count); } |
| 764 | |
| 765 | /** Increases the buffer capacity to *new_capacity*. */ |
| 766 | void reserve(size_t new_capacity) { this->try_reserve(new_capacity); } |
| 767 | |
| 768 | // Directly append data into the buffer |
| 769 | using detail::buffer<T>::append; |
| 770 | template <typename ContiguousRange> |
| 771 | void append(const ContiguousRange& range) { |
| 772 | append(range.data(), range.data() + range.size()); |
| 773 | } |
| 774 | }; |
| 775 | |
| 776 | template <typename T, size_t SIZE, typename Allocator> |
| 777 | FMT_CONSTEXPR20 void basic_memory_buffer<T, SIZE, Allocator>::grow( |
| 778 | size_t size) { |
| 779 | #ifdef FMT_FUZZ |
| 780 | if (size > 5000) throw std::runtime_error("fuzz mode - won't grow that much"); |
| 781 | #endif |
| 782 | const size_t max_size = std::allocator_traits<Allocator>::max_size(alloc_); |
| 783 | size_t old_capacity = this->capacity(); |
| 784 | size_t new_capacity = old_capacity + old_capacity / 2; |
| 785 | if (size > new_capacity) |
| 786 | new_capacity = size; |
| 787 | else if (new_capacity > max_size) |
| 788 | new_capacity = size > max_size ? size : max_size; |
| 789 | T* old_data = this->data(); |
| 790 | T* new_data = |
| 791 | std::allocator_traits<Allocator>::allocate(alloc_, new_capacity); |
| 792 | // The following code doesn't throw, so the raw pointer above doesn't leak. |
| 793 | std::uninitialized_copy(old_data, old_data + this->size(), |
| 794 | detail::make_checked(new_data, new_capacity)); |
| 795 | this->set(new_data, new_capacity); |
| 796 | // deallocate must not throw according to the standard, but even if it does, |
| 797 | // the buffer already uses the new storage and will deallocate it in |
| 798 | // destructor. |
| 799 | if (old_data != store_) alloc_.deallocate(old_data, old_capacity); |
| 800 | } |
| 801 | |
| 802 | using memory_buffer = basic_memory_buffer<char>; |
| 803 | |
| 804 | template <typename T, size_t SIZE, typename Allocator> |
| 805 | struct is_contiguous<basic_memory_buffer<T, SIZE, Allocator>> : std::true_type { |
| 806 | }; |
| 807 | |
| 808 | namespace detail { |
| 809 | FMT_API void print(std::FILE*, string_view); |
| 810 | } |
| 811 | |
| 812 | /** A formatting error such as invalid format string. */ |
| 813 | FMT_CLASS_API |
| 814 | class FMT_API format_error : public std::runtime_error { |
| 815 | public: |
| 816 | explicit format_error(const char* message) : std::runtime_error(message) {} |
| 817 | explicit format_error(const std::string& message) |
| 818 | : std::runtime_error(message) {} |
| 819 | format_error(const format_error&) = default; |
| 820 | format_error& operator=(const format_error&) = default; |
| 821 | format_error(format_error&&) = default; |
| 822 | format_error& operator=(format_error&&) = default; |
| 823 | ~format_error() FMT_NOEXCEPT override FMT_MSC_DEFAULT; |
| 824 | }; |
| 825 | |
| 826 | /** |
| 827 | \rst |
| 828 | Constructs a `~fmt::format_arg_store` object that contains references |
| 829 | to arguments and can be implicitly converted to `~fmt::format_args`. |
| 830 | If ``fmt`` is a compile-time string then `make_args_checked` checks |
| 831 | its validity at compile time. |
| 832 | \endrst |
| 833 | */ |
| 834 | template <typename... Args, typename S, typename Char = char_t<S>> |
| 835 | FMT_INLINE auto make_args_checked(const S& fmt, |
| 836 | const remove_reference_t<Args>&... args) |
| 837 | -> format_arg_store<buffer_context<Char>, remove_reference_t<Args>...> { |
| 838 | static_assert( |
| 839 | detail::count<( |
| 840 | std::is_base_of<detail::view, remove_reference_t<Args>>::value && |
| 841 | std::is_reference<Args>::value)...>() == 0, |
| 842 | "passing views as lvalues is disallowed"); |
| 843 | detail::check_format_string<Args...>(fmt); |
| 844 | return {args...}; |
| 845 | } |
| 846 | |
| 847 | // compile-time support |
| 848 | namespace detail_exported { |
| 849 | #if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS |
| 850 | template <typename Char, size_t N> struct fixed_string { |
| 851 | constexpr fixed_string(const Char (&str)[N]) { |
| 852 | detail::copy_str<Char, const Char*, Char*>(static_cast<const Char*>(str), |
| 853 | str + N, data); |
| 854 | } |
| 855 | Char data[N]{}; |
| 856 | }; |
| 857 | #endif |
| 858 | |
| 859 | // Converts a compile-time string to basic_string_view. |
| 860 | template <typename Char, size_t N> |
| 861 | constexpr auto compile_string_to_view(const Char (&s)[N]) |
| 862 | -> basic_string_view<Char> { |
| 863 | // Remove trailing NUL character if needed. Won't be present if this is used |
| 864 | // with a raw character array (i.e. not defined as a string). |
| 865 | return {s, N - (std::char_traits<Char>::to_int_type(s[N - 1]) == 0 ? 1 : 0)}; |
| 866 | } |
| 867 | template <typename Char> |
| 868 | constexpr auto compile_string_to_view(detail::std_string_view<Char> s) |
| 869 | -> basic_string_view<Char> { |
| 870 | return {s.data(), s.size()}; |
| 871 | } |
| 872 | } // namespace detail_exported |
| 873 | |
| 874 | FMT_BEGIN_DETAIL_NAMESPACE |
| 875 | |
| 876 | template <typename T> struct is_integral : std::is_integral<T> {}; |
| 877 | template <> struct is_integral<int128_t> : std::true_type {}; |
| 878 | template <> struct is_integral<uint128_t> : std::true_type {}; |
| 879 | |
| 880 | template <typename T> |
| 881 | using is_signed = |
| 882 | std::integral_constant<bool, std::numeric_limits<T>::is_signed || |
| 883 | std::is_same<T, int128_t>::value>; |
| 884 | |
| 885 | // Returns true if value is negative, false otherwise. |
| 886 | // Same as `value < 0` but doesn't produce warnings if T is an unsigned type. |
| 887 | template <typename T, FMT_ENABLE_IF(is_signed<T>::value)> |
| 888 | FMT_CONSTEXPR auto is_negative(T value) -> bool { |
| 889 | return value < 0; |
| 890 | } |
| 891 | template <typename T, FMT_ENABLE_IF(!is_signed<T>::value)> |
| 892 | FMT_CONSTEXPR auto is_negative(T) -> bool { |
| 893 | return false; |
| 894 | } |
| 895 | |
| 896 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 897 | FMT_CONSTEXPR auto is_supported_floating_point(T) -> uint16_t { |
| 898 | return (std::is_same<T, float>::value && FMT_USE_FLOAT) || |
| 899 | (std::is_same<T, double>::value && FMT_USE_DOUBLE) || |
| 900 | (std::is_same<T, long double>::value && FMT_USE_LONG_DOUBLE); |
| 901 | } |
| 902 | |
| 903 | // Smallest of uint32_t, uint64_t, uint128_t that is large enough to |
| 904 | // represent all values of an integral type T. |
| 905 | template <typename T> |
| 906 | using uint32_or_64_or_128_t = |
| 907 | conditional_t<num_bits<T>() <= 32 && !FMT_REDUCE_INT_INSTANTIATIONS, |
| 908 | uint32_t, |
| 909 | conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>>; |
| 910 | template <typename T> |
| 911 | using uint64_or_128_t = conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>; |
| 912 | |
| 913 | #define FMT_POWERS_OF_10(factor) \ |
| 914 | factor * 10, (factor)*100, (factor)*1000, (factor)*10000, (factor)*100000, \ |
| 915 | (factor)*1000000, (factor)*10000000, (factor)*100000000, \ |
| 916 | (factor)*1000000000 |
| 917 | |
| 918 | // Converts value in the range [0, 100) to a string. |
| 919 | constexpr const char* digits2(size_t value) { |
| 920 | // GCC generates slightly better code when value is pointer-size. |
| 921 | return &"0001020304050607080910111213141516171819" |
| 922 | "2021222324252627282930313233343536373839" |
| 923 | "4041424344454647484950515253545556575859" |
| 924 | "6061626364656667686970717273747576777879" |
| 925 | "8081828384858687888990919293949596979899"[value * 2]; |
| 926 | } |
| 927 | |
| 928 | // Sign is a template parameter to workaround a bug in gcc 4.8. |
| 929 | template <typename Char, typename Sign> constexpr Char sign(Sign s) { |
| 930 | #if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 604 |
| 931 | static_assert(std::is_same<Sign, sign_t>::value, ""); |
| 932 | #endif |
| 933 | return static_cast<Char>("\0-+ "[s]); |
| 934 | } |
| 935 | |
| 936 | template <typename T> FMT_CONSTEXPR auto count_digits_fallback(T n) -> int { |
| 937 | int count = 1; |
| 938 | for (;;) { |
| 939 | // Integer division is slow so do it for a group of four digits instead |
| 940 | // of for every digit. The idea comes from the talk by Alexandrescu |
| 941 | // "Three Optimization Tips for C++". See speed-test for a comparison. |
| 942 | if (n < 10) return count; |
| 943 | if (n < 100) return count + 1; |
| 944 | if (n < 1000) return count + 2; |
| 945 | if (n < 10000) return count + 3; |
| 946 | n /= 10000u; |
| 947 | count += 4; |
| 948 | } |
| 949 | } |
| 950 | #if FMT_USE_INT128 |
| 951 | FMT_CONSTEXPR inline auto count_digits(uint128_t n) -> int { |
| 952 | return count_digits_fallback(n); |
| 953 | } |
| 954 | #endif |
| 955 | |
| 956 | #ifdef FMT_BUILTIN_CLZLL |
| 957 | // It is a separate function rather than a part of count_digits to workaround |
| 958 | // the lack of static constexpr in constexpr functions. |
| 959 | inline auto do_count_digits(uint64_t n) -> int { |
| 960 | // This has comparable performance to the version by Kendall Willets |
| 961 | // (https://github.com/fmtlib/format-benchmark/blob/master/digits10) |
| 962 | // but uses smaller tables. |
| 963 | // Maps bsr(n) to ceil(log10(pow(2, bsr(n) + 1) - 1)). |
| 964 | static constexpr uint8_t bsr2log10[] = { |
| 965 | 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, |
| 966 | 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, |
| 967 | 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15, |
| 968 | 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 20}; |
| 969 | auto t = bsr2log10[FMT_BUILTIN_CLZLL(n | 1) ^ 63]; |
| 970 | static constexpr const uint64_t zero_or_powers_of_10[] = { |
| 971 | 0, 0, FMT_POWERS_OF_10(1U), FMT_POWERS_OF_10(1000000000ULL), |
| 972 | 10000000000000000000ULL}; |
| 973 | return t - (n < zero_or_powers_of_10[t]); |
| 974 | } |
| 975 | #endif |
| 976 | |
| 977 | // Returns the number of decimal digits in n. Leading zeros are not counted |
| 978 | // except for n == 0 in which case count_digits returns 1. |
| 979 | FMT_CONSTEXPR20 inline auto count_digits(uint64_t n) -> int { |
| 980 | #ifdef FMT_BUILTIN_CLZLL |
| 981 | if (!is_constant_evaluated()) { |
| 982 | return do_count_digits(n); |
| 983 | } |
| 984 | #endif |
| 985 | return count_digits_fallback(n); |
| 986 | } |
| 987 | |
| 988 | // Counts the number of digits in n. BITS = log2(radix). |
| 989 | template <int BITS, typename UInt> |
| 990 | FMT_CONSTEXPR auto count_digits(UInt n) -> int { |
| 991 | #ifdef FMT_BUILTIN_CLZ |
| 992 | if (num_bits<UInt>() == 32) |
| 993 | return (FMT_BUILTIN_CLZ(static_cast<uint32_t>(n) | 1) ^ 31) / BITS + 1; |
| 994 | #endif |
| 995 | // Lambda avoids unreachable code warnings from NVHPC. |
| 996 | return [](UInt m) { |
| 997 | int num_digits = 0; |
| 998 | do { |
| 999 | ++num_digits; |
| 1000 | } while ((m >>= BITS) != 0); |
| 1001 | return num_digits; |
| 1002 | }(n); |
| 1003 | } |
| 1004 | |
| 1005 | template <> auto count_digits<4>(detail::fallback_uintptr n) -> int; |
| 1006 | |
| 1007 | #ifdef FMT_BUILTIN_CLZ |
| 1008 | // It is a separate function rather than a part of count_digits to workaround |
| 1009 | // the lack of static constexpr in constexpr functions. |
| 1010 | FMT_INLINE auto do_count_digits(uint32_t n) -> int { |
| 1011 | // An optimization by Kendall Willets from https://bit.ly/3uOIQrB. |
| 1012 | // This increments the upper 32 bits (log10(T) - 1) when >= T is added. |
| 1013 | # define FMT_INC(T) (((sizeof(# T) - 1ull) << 32) - T) |
| 1014 | static constexpr uint64_t table[] = { |
| 1015 | FMT_INC(0), FMT_INC(0), FMT_INC(0), // 8 |
| 1016 | FMT_INC(10), FMT_INC(10), FMT_INC(10), // 64 |
| 1017 | FMT_INC(100), FMT_INC(100), FMT_INC(100), // 512 |
| 1018 | FMT_INC(1000), FMT_INC(1000), FMT_INC(1000), // 4096 |
| 1019 | FMT_INC(10000), FMT_INC(10000), FMT_INC(10000), // 32k |
| 1020 | FMT_INC(100000), FMT_INC(100000), FMT_INC(100000), // 256k |
| 1021 | FMT_INC(1000000), FMT_INC(1000000), FMT_INC(1000000), // 2048k |
| 1022 | FMT_INC(10000000), FMT_INC(10000000), FMT_INC(10000000), // 16M |
| 1023 | FMT_INC(100000000), FMT_INC(100000000), FMT_INC(100000000), // 128M |
| 1024 | FMT_INC(1000000000), FMT_INC(1000000000), FMT_INC(1000000000), // 1024M |
| 1025 | FMT_INC(1000000000), FMT_INC(1000000000) // 4B |
| 1026 | }; |
| 1027 | auto inc = table[FMT_BUILTIN_CLZ(n | 1) ^ 31]; |
| 1028 | return static_cast<int>((n + inc) >> 32); |
| 1029 | } |
| 1030 | #endif |
| 1031 | |
| 1032 | // Optional version of count_digits for better performance on 32-bit platforms. |
| 1033 | FMT_CONSTEXPR20 inline auto count_digits(uint32_t n) -> int { |
| 1034 | #ifdef FMT_BUILTIN_CLZ |
| 1035 | if (!is_constant_evaluated()) { |
| 1036 | return do_count_digits(n); |
| 1037 | } |
| 1038 | #endif |
| 1039 | return count_digits_fallback(n); |
| 1040 | } |
| 1041 | |
| 1042 | template <typename Int> constexpr auto digits10() FMT_NOEXCEPT -> int { |
| 1043 | return std::numeric_limits<Int>::digits10; |
| 1044 | } |
| 1045 | template <> constexpr auto digits10<int128_t>() FMT_NOEXCEPT -> int { |
| 1046 | return 38; |
| 1047 | } |
| 1048 | template <> constexpr auto digits10<uint128_t>() FMT_NOEXCEPT -> int { |
| 1049 | return 38; |
| 1050 | } |
| 1051 | |
| 1052 | template <typename Char> struct thousands_sep_result { |
| 1053 | std::string grouping; |
| 1054 | Char thousands_sep; |
| 1055 | }; |
| 1056 | |
| 1057 | template <typename Char> |
| 1058 | FMT_API auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result<Char>; |
| 1059 | template <typename Char> |
| 1060 | inline auto thousands_sep(locale_ref loc) -> thousands_sep_result<Char> { |
| 1061 | auto result = thousands_sep_impl<char>(loc); |
| 1062 | return {result.grouping, Char(result.thousands_sep)}; |
| 1063 | } |
| 1064 | template <> |
| 1065 | inline auto thousands_sep(locale_ref loc) -> thousands_sep_result<wchar_t> { |
| 1066 | return thousands_sep_impl<wchar_t>(loc); |
| 1067 | } |
| 1068 | |
| 1069 | template <typename Char> |
| 1070 | FMT_API auto decimal_point_impl(locale_ref loc) -> Char; |
| 1071 | template <typename Char> inline auto decimal_point(locale_ref loc) -> Char { |
| 1072 | return Char(decimal_point_impl<char>(loc)); |
| 1073 | } |
| 1074 | template <> inline auto decimal_point(locale_ref loc) -> wchar_t { |
| 1075 | return decimal_point_impl<wchar_t>(loc); |
| 1076 | } |
| 1077 | |
| 1078 | // Compares two characters for equality. |
| 1079 | template <typename Char> auto equal2(const Char* lhs, const char* rhs) -> bool { |
| 1080 | return lhs[0] == Char(rhs[0]) && lhs[1] == Char(rhs[1]); |
| 1081 | } |
| 1082 | inline auto equal2(const char* lhs, const char* rhs) -> bool { |
| 1083 | return memcmp(lhs, rhs, 2) == 0; |
| 1084 | } |
| 1085 | |
| 1086 | // Copies two characters from src to dst. |
| 1087 | template <typename Char> |
| 1088 | FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) { |
| 1089 | if (!is_constant_evaluated() && sizeof(Char) == sizeof(char)) { |
| 1090 | memcpy(dst, src, 2); |
| 1091 | return; |
| 1092 | } |
| 1093 | *dst++ = static_cast<Char>(*src++); |
| 1094 | *dst = static_cast<Char>(*src); |
| 1095 | } |
| 1096 | |
| 1097 | template <typename Iterator> struct format_decimal_result { |
| 1098 | Iterator begin; |
| 1099 | Iterator end; |
| 1100 | }; |
| 1101 | |
| 1102 | // Formats a decimal unsigned integer value writing into out pointing to a |
| 1103 | // buffer of specified size. The caller must ensure that the buffer is large |
| 1104 | // enough. |
| 1105 | template <typename Char, typename UInt> |
| 1106 | FMT_CONSTEXPR20 auto format_decimal(Char* out, UInt value, int size) |
| 1107 | -> format_decimal_result<Char*> { |
| 1108 | FMT_ASSERT(size >= count_digits(value), "invalid digit count"); |
| 1109 | out += size; |
| 1110 | Char* end = out; |
| 1111 | while (value >= 100) { |
| 1112 | // Integer division is slow so do it for a group of two digits instead |
| 1113 | // of for every digit. The idea comes from the talk by Alexandrescu |
| 1114 | // "Three Optimization Tips for C++". See speed-test for a comparison. |
| 1115 | out -= 2; |
| 1116 | copy2(out, digits2(static_cast<size_t>(value % 100))); |
| 1117 | value /= 100; |
| 1118 | } |
| 1119 | if (value < 10) { |
| 1120 | *--out = static_cast<Char>('0' + value); |
| 1121 | return {out, end}; |
| 1122 | } |
| 1123 | out -= 2; |
| 1124 | copy2(out, digits2(static_cast<size_t>(value))); |
| 1125 | return {out, end}; |
| 1126 | } |
| 1127 | |
| 1128 | template <typename Char, typename UInt, typename Iterator, |
| 1129 | FMT_ENABLE_IF(!std::is_pointer<remove_cvref_t<Iterator>>::value)> |
| 1130 | inline auto format_decimal(Iterator out, UInt value, int size) |
| 1131 | -> format_decimal_result<Iterator> { |
| 1132 | // Buffer is large enough to hold all digits (digits10 + 1). |
| 1133 | Char buffer[digits10<UInt>() + 1]; |
| 1134 | auto end = format_decimal(buffer, value, size).end; |
| 1135 | return {out, detail::copy_str_noinline<Char>(buffer, end, out)}; |
| 1136 | } |
| 1137 | |
| 1138 | template <unsigned BASE_BITS, typename Char, typename UInt> |
| 1139 | FMT_CONSTEXPR auto format_uint(Char* buffer, UInt value, int num_digits, |
| 1140 | bool upper = false) -> Char* { |
| 1141 | buffer += num_digits; |
| 1142 | Char* end = buffer; |
| 1143 | do { |
| 1144 | const char* digits = upper ? "0123456789ABCDEF" : "0123456789abcdef"; |
| 1145 | unsigned digit = (value & ((1 << BASE_BITS) - 1)); |
| 1146 | *--buffer = static_cast<Char>(BASE_BITS < 4 ? static_cast<char>('0' + digit) |
| 1147 | : digits[digit]); |
| 1148 | } while ((value >>= BASE_BITS) != 0); |
| 1149 | return end; |
| 1150 | } |
| 1151 | |
| 1152 | template <unsigned BASE_BITS, typename Char> |
| 1153 | auto format_uint(Char* buffer, detail::fallback_uintptr n, int num_digits, |
| 1154 | bool = false) -> Char* { |
| 1155 | auto char_digits = std::numeric_limits<unsigned char>::digits / 4; |
| 1156 | int start = (num_digits + char_digits - 1) / char_digits - 1; |
| 1157 | if (int start_digits = num_digits % char_digits) { |
| 1158 | unsigned value = n.value[start--]; |
| 1159 | buffer = format_uint<BASE_BITS>(buffer, value, start_digits); |
| 1160 | } |
| 1161 | for (; start >= 0; --start) { |
| 1162 | unsigned value = n.value[start]; |
| 1163 | buffer += char_digits; |
| 1164 | auto p = buffer; |
| 1165 | for (int i = 0; i < char_digits; ++i) { |
| 1166 | unsigned digit = (value & ((1 << BASE_BITS) - 1)); |
| 1167 | *--p = static_cast<Char>("0123456789abcdef"[digit]); |
| 1168 | value >>= BASE_BITS; |
| 1169 | } |
| 1170 | } |
| 1171 | return buffer; |
| 1172 | } |
| 1173 | |
| 1174 | template <unsigned BASE_BITS, typename Char, typename It, typename UInt> |
| 1175 | inline auto format_uint(It out, UInt value, int num_digits, bool upper = false) |
| 1176 | -> It { |
| 1177 | if (auto ptr = to_pointer<Char>(out, to_unsigned(num_digits))) { |
| 1178 | format_uint<BASE_BITS>(ptr, value, num_digits, upper); |
| 1179 | return out; |
| 1180 | } |
| 1181 | // Buffer should be large enough to hold all digits (digits / BASE_BITS + 1). |
| 1182 | char buffer[num_bits<UInt>() / BASE_BITS + 1]; |
| 1183 | format_uint<BASE_BITS>(buffer, value, num_digits, upper); |
| 1184 | return detail::copy_str_noinline<Char>(buffer, buffer + num_digits, out); |
| 1185 | } |
| 1186 | |
| 1187 | // A converter from UTF-8 to UTF-16. |
| 1188 | class utf8_to_utf16 { |
| 1189 | private: |
| 1190 | basic_memory_buffer<wchar_t> buffer_; |
| 1191 | |
| 1192 | public: |
| 1193 | FMT_API explicit utf8_to_utf16(string_view s); |
| 1194 | operator basic_string_view<wchar_t>() const { return {&buffer_[0], size()}; } |
| 1195 | auto size() const -> size_t { return buffer_.size() - 1; } |
| 1196 | auto c_str() const -> const wchar_t* { return &buffer_[0]; } |
| 1197 | auto str() const -> std::wstring { return {&buffer_[0], size()}; } |
| 1198 | }; |
| 1199 | |
| 1200 | namespace dragonbox { |
| 1201 | |
| 1202 | // Type-specific information that Dragonbox uses. |
| 1203 | template <class T> struct float_info; |
| 1204 | |
| 1205 | template <> struct float_info<float> { |
| 1206 | using carrier_uint = uint32_t; |
| 1207 | static const int significand_bits = 23; |
| 1208 | static const int exponent_bits = 8; |
| 1209 | static const int min_exponent = -126; |
| 1210 | static const int max_exponent = 127; |
| 1211 | static const int exponent_bias = -127; |
| 1212 | static const int decimal_digits = 9; |
| 1213 | static const int kappa = 1; |
| 1214 | static const int big_divisor = 100; |
| 1215 | static const int small_divisor = 10; |
| 1216 | static const int min_k = -31; |
| 1217 | static const int max_k = 46; |
| 1218 | static const int cache_bits = 64; |
| 1219 | static const int divisibility_check_by_5_threshold = 39; |
| 1220 | static const int case_fc_pm_half_lower_threshold = -1; |
| 1221 | static const int case_fc_pm_half_upper_threshold = 6; |
| 1222 | static const int case_fc_lower_threshold = -2; |
| 1223 | static const int case_fc_upper_threshold = 6; |
| 1224 | static const int case_shorter_interval_left_endpoint_lower_threshold = 2; |
| 1225 | static const int case_shorter_interval_left_endpoint_upper_threshold = 3; |
| 1226 | static const int shorter_interval_tie_lower_threshold = -35; |
| 1227 | static const int shorter_interval_tie_upper_threshold = -35; |
| 1228 | static const int max_trailing_zeros = 7; |
| 1229 | }; |
| 1230 | |
| 1231 | template <> struct float_info<double> { |
| 1232 | using carrier_uint = uint64_t; |
| 1233 | static const int significand_bits = 52; |
| 1234 | static const int exponent_bits = 11; |
| 1235 | static const int min_exponent = -1022; |
| 1236 | static const int max_exponent = 1023; |
| 1237 | static const int exponent_bias = -1023; |
| 1238 | static const int decimal_digits = 17; |
| 1239 | static const int kappa = 2; |
| 1240 | static const int big_divisor = 1000; |
| 1241 | static const int small_divisor = 100; |
| 1242 | static const int min_k = -292; |
| 1243 | static const int max_k = 326; |
| 1244 | static const int cache_bits = 128; |
| 1245 | static const int divisibility_check_by_5_threshold = 86; |
| 1246 | static const int case_fc_pm_half_lower_threshold = -2; |
| 1247 | static const int case_fc_pm_half_upper_threshold = 9; |
| 1248 | static const int case_fc_lower_threshold = -4; |
| 1249 | static const int case_fc_upper_threshold = 9; |
| 1250 | static const int case_shorter_interval_left_endpoint_lower_threshold = 2; |
| 1251 | static const int case_shorter_interval_left_endpoint_upper_threshold = 3; |
| 1252 | static const int shorter_interval_tie_lower_threshold = -77; |
| 1253 | static const int shorter_interval_tie_upper_threshold = -77; |
| 1254 | static const int max_trailing_zeros = 16; |
| 1255 | }; |
| 1256 | |
| 1257 | template <typename T> struct decimal_fp { |
| 1258 | using significand_type = typename float_info<T>::carrier_uint; |
| 1259 | significand_type significand; |
| 1260 | int exponent; |
| 1261 | }; |
| 1262 | |
| 1263 | template <typename T> |
| 1264 | FMT_API auto to_decimal(T x) FMT_NOEXCEPT -> decimal_fp<T>; |
| 1265 | } // namespace dragonbox |
| 1266 | |
| 1267 | template <typename T> |
| 1268 | constexpr auto exponent_mask() -> |
| 1269 | typename dragonbox::float_info<T>::carrier_uint { |
| 1270 | using uint = typename dragonbox::float_info<T>::carrier_uint; |
| 1271 | return ((uint(1) << dragonbox::float_info<T>::exponent_bits) - 1) |
| 1272 | << dragonbox::float_info<T>::significand_bits; |
| 1273 | } |
| 1274 | |
| 1275 | // Writes the exponent exp in the form "[+-]d{2,3}" to buffer. |
| 1276 | template <typename Char, typename It> |
| 1277 | FMT_CONSTEXPR auto write_exponent(int exp, It it) -> It { |
| 1278 | FMT_ASSERT(-10000 < exp && exp < 10000, "exponent out of range"); |
| 1279 | if (exp < 0) { |
| 1280 | *it++ = static_cast<Char>('-'); |
| 1281 | exp = -exp; |
| 1282 | } else { |
| 1283 | *it++ = static_cast<Char>('+'); |
| 1284 | } |
| 1285 | if (exp >= 100) { |
| 1286 | const char* top = digits2(to_unsigned(exp / 100)); |
| 1287 | if (exp >= 1000) *it++ = static_cast<Char>(top[0]); |
| 1288 | *it++ = static_cast<Char>(top[1]); |
| 1289 | exp %= 100; |
| 1290 | } |
| 1291 | const char* d = digits2(to_unsigned(exp)); |
| 1292 | *it++ = static_cast<Char>(d[0]); |
| 1293 | *it++ = static_cast<Char>(d[1]); |
| 1294 | return it; |
| 1295 | } |
| 1296 | |
| 1297 | template <typename T> |
| 1298 | FMT_HEADER_ONLY_CONSTEXPR20 auto format_float(T value, int precision, |
| 1299 | float_specs specs, |
| 1300 | buffer<char>& buf) -> int; |
| 1301 | |
| 1302 | // Formats a floating-point number with snprintf. |
| 1303 | template <typename T> |
| 1304 | auto snprintf_float(T value, int precision, float_specs specs, |
| 1305 | buffer<char>& buf) -> int; |
| 1306 | |
| 1307 | template <typename T> constexpr auto promote_float(T value) -> T { |
| 1308 | return value; |
| 1309 | } |
| 1310 | constexpr auto promote_float(float value) -> double { |
| 1311 | return static_cast<double>(value); |
| 1312 | } |
| 1313 | |
| 1314 | template <typename OutputIt, typename Char> |
| 1315 | FMT_NOINLINE FMT_CONSTEXPR auto fill(OutputIt it, size_t n, |
| 1316 | const fill_t<Char>& fill) -> OutputIt { |
| 1317 | auto fill_size = fill.size(); |
| 1318 | if (fill_size == 1) return detail::fill_n(it, n, fill[0]); |
| 1319 | auto data = fill.data(); |
| 1320 | for (size_t i = 0; i < n; ++i) |
| 1321 | it = copy_str<Char>(data, data + fill_size, it); |
| 1322 | return it; |
| 1323 | } |
| 1324 | |
| 1325 | // Writes the output of f, padded according to format specifications in specs. |
| 1326 | // size: output size in code units. |
| 1327 | // width: output display width in (terminal) column positions. |
| 1328 | template <align::type align = align::left, typename OutputIt, typename Char, |
| 1329 | typename F> |
| 1330 | FMT_CONSTEXPR auto write_padded(OutputIt out, |
| 1331 | const basic_format_specs<Char>& specs, |
| 1332 | size_t size, size_t width, F&& f) -> OutputIt { |
| 1333 | static_assert(align == align::left || align == align::right, ""); |
| 1334 | unsigned spec_width = to_unsigned(specs.width); |
| 1335 | size_t padding = spec_width > width ? spec_width - width : 0; |
| 1336 | // Shifts are encoded as string literals because static constexpr is not |
| 1337 | // supported in constexpr functions. |
| 1338 | auto* shifts = align == align::left ? "\x1f\x1f\x00\x01" : "\x00\x1f\x00\x01"; |
| 1339 | size_t left_padding = padding >> shifts[specs.align]; |
| 1340 | size_t right_padding = padding - left_padding; |
| 1341 | auto it = reserve(out, size + padding * specs.fill.size()); |
| 1342 | if (left_padding != 0) it = fill(it, left_padding, specs.fill); |
| 1343 | it = f(it); |
| 1344 | if (right_padding != 0) it = fill(it, right_padding, specs.fill); |
| 1345 | return base_iterator(out, it); |
| 1346 | } |
| 1347 | |
| 1348 | template <align::type align = align::left, typename OutputIt, typename Char, |
| 1349 | typename F> |
| 1350 | constexpr auto write_padded(OutputIt out, const basic_format_specs<Char>& specs, |
| 1351 | size_t size, F&& f) -> OutputIt { |
| 1352 | return write_padded<align>(out, specs, size, size, f); |
| 1353 | } |
| 1354 | |
| 1355 | template <align::type align = align::left, typename Char, typename OutputIt> |
| 1356 | FMT_CONSTEXPR auto write_bytes(OutputIt out, string_view bytes, |
| 1357 | const basic_format_specs<Char>& specs) |
| 1358 | -> OutputIt { |
| 1359 | return write_padded<align>( |
| 1360 | out, specs, bytes.size(), [bytes](reserve_iterator<OutputIt> it) { |
| 1361 | const char* data = bytes.data(); |
| 1362 | return copy_str<Char>(data, data + bytes.size(), it); |
| 1363 | }); |
| 1364 | } |
| 1365 | |
| 1366 | template <typename Char, typename OutputIt, typename UIntPtr> |
| 1367 | auto write_ptr(OutputIt out, UIntPtr value, |
| 1368 | const basic_format_specs<Char>* specs) -> OutputIt { |
| 1369 | int num_digits = count_digits<4>(value); |
| 1370 | auto size = to_unsigned(num_digits) + size_t(2); |
| 1371 | auto write = [=](reserve_iterator<OutputIt> it) { |
| 1372 | *it++ = static_cast<Char>('0'); |
| 1373 | *it++ = static_cast<Char>('x'); |
| 1374 | return format_uint<4, Char>(it, value, num_digits); |
| 1375 | }; |
| 1376 | return specs ? write_padded<align::right>(out, *specs, size, write) |
| 1377 | : base_iterator(out, write(reserve(out, size))); |
| 1378 | } |
| 1379 | |
| 1380 | template <typename Char, typename OutputIt> |
| 1381 | FMT_CONSTEXPR auto write_char(OutputIt out, Char value, |
| 1382 | const basic_format_specs<Char>& specs) |
| 1383 | -> OutputIt { |
| 1384 | return write_padded(out, specs, 1, [=](reserve_iterator<OutputIt> it) { |
| 1385 | *it++ = value; |
| 1386 | return it; |
| 1387 | }); |
| 1388 | } |
| 1389 | template <typename Char, typename OutputIt> |
| 1390 | FMT_CONSTEXPR auto write(OutputIt out, Char value, |
| 1391 | const basic_format_specs<Char>& specs, |
| 1392 | locale_ref loc = {}) -> OutputIt { |
| 1393 | return check_char_specs(specs) |
| 1394 | ? write_char(out, value, specs) |
| 1395 | : write(out, static_cast<int>(value), specs, loc); |
| 1396 | } |
| 1397 | |
| 1398 | // Data for write_int that doesn't depend on output iterator type. It is used to |
| 1399 | // avoid template code bloat. |
| 1400 | template <typename Char> struct write_int_data { |
| 1401 | size_t size; |
| 1402 | size_t padding; |
| 1403 | |
| 1404 | FMT_CONSTEXPR write_int_data(int num_digits, unsigned prefix, |
| 1405 | const basic_format_specs<Char>& specs) |
| 1406 | : size((prefix >> 24) + to_unsigned(num_digits)), padding(0) { |
| 1407 | if (specs.align == align::numeric) { |
| 1408 | auto width = to_unsigned(specs.width); |
| 1409 | if (width > size) { |
| 1410 | padding = width - size; |
| 1411 | size = width; |
| 1412 | } |
| 1413 | } else if (specs.precision > num_digits) { |
| 1414 | size = (prefix >> 24) + to_unsigned(specs.precision); |
| 1415 | padding = to_unsigned(specs.precision - num_digits); |
| 1416 | } |
| 1417 | } |
| 1418 | }; |
| 1419 | |
| 1420 | // Writes an integer in the format |
| 1421 | // <left-padding><prefix><numeric-padding><digits><right-padding> |
| 1422 | // where <digits> are written by write_digits(it). |
| 1423 | // prefix contains chars in three lower bytes and the size in the fourth byte. |
| 1424 | template <typename OutputIt, typename Char, typename W> |
| 1425 | FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, int num_digits, |
| 1426 | unsigned prefix, |
| 1427 | const basic_format_specs<Char>& specs, |
| 1428 | W write_digits) -> OutputIt { |
| 1429 | // Slightly faster check for specs.width == 0 && specs.precision == -1. |
| 1430 | if ((specs.width | (specs.precision + 1)) == 0) { |
| 1431 | auto it = reserve(out, to_unsigned(num_digits) + (prefix >> 24)); |
| 1432 | if (prefix != 0) { |
| 1433 | for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8) |
| 1434 | *it++ = static_cast<Char>(p & 0xff); |
| 1435 | } |
| 1436 | return base_iterator(out, write_digits(it)); |
| 1437 | } |
| 1438 | auto data = write_int_data<Char>(num_digits, prefix, specs); |
| 1439 | return write_padded<align::right>( |
| 1440 | out, specs, data.size, [=](reserve_iterator<OutputIt> it) { |
| 1441 | for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8) |
| 1442 | *it++ = static_cast<Char>(p & 0xff); |
| 1443 | it = detail::fill_n(it, data.padding, static_cast<Char>('0')); |
| 1444 | return write_digits(it); |
| 1445 | }); |
| 1446 | } |
| 1447 | |
| 1448 | template <typename Char> class digit_grouping { |
| 1449 | private: |
| 1450 | thousands_sep_result<Char> sep_; |
| 1451 | |
| 1452 | struct next_state { |
| 1453 | std::string::const_iterator group; |
| 1454 | int pos; |
| 1455 | }; |
| 1456 | next_state initial_state() const { return {sep_.grouping.begin(), 0}; } |
| 1457 | |
| 1458 | // Returns the next digit group separator position. |
| 1459 | int next(next_state& state) const { |
| 1460 | if (!sep_.thousands_sep) return max_value<int>(); |
| 1461 | if (state.group == sep_.grouping.end()) |
| 1462 | return state.pos += sep_.grouping.back(); |
| 1463 | if (*state.group <= 0 || *state.group == max_value<char>()) |
| 1464 | return max_value<int>(); |
| 1465 | state.pos += *state.group++; |
| 1466 | return state.pos; |
| 1467 | } |
| 1468 | |
| 1469 | public: |
| 1470 | explicit digit_grouping(locale_ref loc, bool localized = true) { |
| 1471 | if (localized) |
| 1472 | sep_ = thousands_sep<Char>(loc); |
| 1473 | else |
| 1474 | sep_.thousands_sep = Char(); |
| 1475 | } |
| 1476 | explicit digit_grouping(thousands_sep_result<Char> sep) : sep_(sep) {} |
| 1477 | |
| 1478 | Char separator() const { return sep_.thousands_sep; } |
| 1479 | |
| 1480 | int count_separators(int num_digits) const { |
| 1481 | int count = 0; |
| 1482 | auto state = initial_state(); |
| 1483 | while (num_digits > next(state)) ++count; |
| 1484 | return count; |
| 1485 | } |
| 1486 | |
| 1487 | // Applies grouping to digits and write the output to out. |
| 1488 | template <typename Out, typename C> |
| 1489 | Out apply(Out out, basic_string_view<C> digits) const { |
| 1490 | auto num_digits = static_cast<int>(digits.size()); |
| 1491 | auto separators = basic_memory_buffer<int>(); |
| 1492 | separators.push_back(0); |
| 1493 | auto state = initial_state(); |
| 1494 | while (int i = next(state)) { |
| 1495 | if (i >= num_digits) break; |
| 1496 | separators.push_back(i); |
| 1497 | } |
| 1498 | for (int i = 0, sep_index = static_cast<int>(separators.size() - 1); |
| 1499 | i < num_digits; ++i) { |
| 1500 | if (num_digits - i == separators[sep_index]) { |
| 1501 | *out++ = separator(); |
| 1502 | --sep_index; |
| 1503 | } |
| 1504 | *out++ = static_cast<Char>(digits[to_unsigned(i)]); |
| 1505 | } |
| 1506 | return out; |
| 1507 | } |
| 1508 | }; |
| 1509 | |
| 1510 | template <typename OutputIt, typename UInt, typename Char> |
| 1511 | auto write_int_localized(OutputIt out, UInt value, unsigned prefix, |
| 1512 | const basic_format_specs<Char>& specs, |
| 1513 | const digit_grouping<Char>& grouping) -> OutputIt { |
| 1514 | static_assert(std::is_same<uint64_or_128_t<UInt>, UInt>::value, ""); |
| 1515 | int num_digits = count_digits(value); |
| 1516 | char digits[40]; |
| 1517 | format_decimal(digits, value, num_digits); |
| 1518 | unsigned size = to_unsigned((prefix != 0 ? 1 : 0) + num_digits + |
| 1519 | grouping.count_separators(num_digits)); |
| 1520 | return write_padded<align::right>( |
| 1521 | out, specs, size, size, [&](reserve_iterator<OutputIt> it) { |
| 1522 | if (prefix != 0) *it++ = static_cast<Char>(prefix); |
| 1523 | return grouping.apply(it, string_view(digits, to_unsigned(num_digits))); |
| 1524 | }); |
| 1525 | } |
| 1526 | |
| 1527 | template <typename OutputIt, typename UInt, typename Char> |
| 1528 | auto write_int_localized(OutputIt& out, UInt value, unsigned prefix, |
| 1529 | const basic_format_specs<Char>& specs, locale_ref loc) |
| 1530 | -> bool { |
| 1531 | auto grouping = digit_grouping<Char>(loc); |
| 1532 | out = write_int_localized(out, value, prefix, specs, grouping); |
| 1533 | return true; |
| 1534 | } |
| 1535 | |
| 1536 | FMT_CONSTEXPR inline void prefix_append(unsigned& prefix, unsigned value) { |
| 1537 | prefix |= prefix != 0 ? value << 8 : value; |
| 1538 | prefix += (1u + (value > 0xff ? 1 : 0)) << 24; |
| 1539 | } |
| 1540 | |
| 1541 | template <typename UInt> struct write_int_arg { |
| 1542 | UInt abs_value; |
| 1543 | unsigned prefix; |
| 1544 | }; |
| 1545 | |
| 1546 | template <typename T> |
| 1547 | FMT_CONSTEXPR auto make_write_int_arg(T value, sign_t sign) |
| 1548 | -> write_int_arg<uint32_or_64_or_128_t<T>> { |
| 1549 | auto prefix = 0u; |
| 1550 | auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(value); |
| 1551 | if (is_negative(value)) { |
| 1552 | prefix = 0x01000000 | '-'; |
| 1553 | abs_value = 0 - abs_value; |
| 1554 | } else { |
| 1555 | constexpr const unsigned prefixes[4] = {0, 0, 0x1000000u | '+', |
| 1556 | 0x1000000u | ' '}; |
| 1557 | prefix = prefixes[sign]; |
| 1558 | } |
| 1559 | return {abs_value, prefix}; |
| 1560 | } |
| 1561 | |
| 1562 | template <typename Char, typename OutputIt, typename T> |
| 1563 | FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, write_int_arg<T> arg, |
| 1564 | const basic_format_specs<Char>& specs, |
| 1565 | locale_ref loc) -> OutputIt { |
| 1566 | static_assert(std::is_same<T, uint32_or_64_or_128_t<T>>::value, ""); |
| 1567 | auto abs_value = arg.abs_value; |
| 1568 | auto prefix = arg.prefix; |
| 1569 | switch (specs.type) { |
| 1570 | case presentation_type::none: |
| 1571 | case presentation_type::dec: { |
| 1572 | if (specs.localized && |
| 1573 | write_int_localized(out, static_cast<uint64_or_128_t<T>>(abs_value), |
| 1574 | prefix, specs, loc)) { |
| 1575 | return out; |
| 1576 | } |
| 1577 | auto num_digits = count_digits(abs_value); |
| 1578 | return write_int( |
| 1579 | out, num_digits, prefix, specs, [=](reserve_iterator<OutputIt> it) { |
| 1580 | return format_decimal<Char>(it, abs_value, num_digits).end; |
| 1581 | }); |
| 1582 | } |
| 1583 | case presentation_type::hex_lower: |
| 1584 | case presentation_type::hex_upper: { |
| 1585 | bool upper = specs.type == presentation_type::hex_upper; |
| 1586 | if (specs.alt) |
| 1587 | prefix_append(prefix, unsigned(upper ? 'X' : 'x') << 8 | '0'); |
| 1588 | int num_digits = count_digits<4>(abs_value); |
| 1589 | return write_int( |
| 1590 | out, num_digits, prefix, specs, [=](reserve_iterator<OutputIt> it) { |
| 1591 | return format_uint<4, Char>(it, abs_value, num_digits, upper); |
| 1592 | }); |
| 1593 | } |
| 1594 | case presentation_type::bin_lower: |
| 1595 | case presentation_type::bin_upper: { |
| 1596 | bool upper = specs.type == presentation_type::bin_upper; |
| 1597 | if (specs.alt) |
| 1598 | prefix_append(prefix, unsigned(upper ? 'B' : 'b') << 8 | '0'); |
| 1599 | int num_digits = count_digits<1>(abs_value); |
| 1600 | return write_int(out, num_digits, prefix, specs, |
| 1601 | [=](reserve_iterator<OutputIt> it) { |
| 1602 | return format_uint<1, Char>(it, abs_value, num_digits); |
| 1603 | }); |
| 1604 | } |
| 1605 | case presentation_type::oct: { |
| 1606 | int num_digits = count_digits<3>(abs_value); |
| 1607 | // Octal prefix '0' is counted as a digit, so only add it if precision |
| 1608 | // is not greater than the number of digits. |
| 1609 | if (specs.alt && specs.precision <= num_digits && abs_value != 0) |
| 1610 | prefix_append(prefix, '0'); |
| 1611 | return write_int(out, num_digits, prefix, specs, |
| 1612 | [=](reserve_iterator<OutputIt> it) { |
| 1613 | return format_uint<3, Char>(it, abs_value, num_digits); |
| 1614 | }); |
| 1615 | } |
| 1616 | case presentation_type::chr: |
| 1617 | return write_char(out, static_cast<Char>(abs_value), specs); |
| 1618 | default: |
| 1619 | throw_format_error("invalid type specifier"); |
| 1620 | } |
| 1621 | return out; |
| 1622 | } |
| 1623 | template <typename Char, typename OutputIt, typename T> |
| 1624 | FMT_CONSTEXPR FMT_NOINLINE auto write_int_noinline( |
| 1625 | OutputIt out, write_int_arg<T> arg, const basic_format_specs<Char>& specs, |
| 1626 | locale_ref loc) -> OutputIt { |
| 1627 | return write_int(out, arg, specs, loc); |
| 1628 | } |
| 1629 | template <typename Char, typename OutputIt, typename T, |
| 1630 | FMT_ENABLE_IF(is_integral<T>::value && |
| 1631 | !std::is_same<T, bool>::value && |
| 1632 | std::is_same<OutputIt, buffer_appender<Char>>::value)> |
| 1633 | FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value, |
| 1634 | const basic_format_specs<Char>& specs, |
| 1635 | locale_ref loc) -> OutputIt { |
| 1636 | return write_int_noinline(out, make_write_int_arg(value, specs.sign), specs, |
| 1637 | loc); |
| 1638 | } |
| 1639 | // An inlined version of write used in format string compilation. |
| 1640 | template <typename Char, typename OutputIt, typename T, |
| 1641 | FMT_ENABLE_IF(is_integral<T>::value && |
| 1642 | !std::is_same<T, bool>::value && |
| 1643 | !std::is_same<OutputIt, buffer_appender<Char>>::value)> |
| 1644 | FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value, |
| 1645 | const basic_format_specs<Char>& specs, |
| 1646 | locale_ref loc) -> OutputIt { |
| 1647 | return write_int(out, make_write_int_arg(value, specs.sign), specs, loc); |
| 1648 | } |
| 1649 | |
| 1650 | template <typename Char, typename OutputIt> |
| 1651 | FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> s, |
| 1652 | const basic_format_specs<Char>& specs) -> OutputIt { |
| 1653 | auto data = s.data(); |
| 1654 | auto size = s.size(); |
| 1655 | if (specs.precision >= 0 && to_unsigned(specs.precision) < size) |
| 1656 | size = code_point_index(s, to_unsigned(specs.precision)); |
| 1657 | auto width = |
| 1658 | specs.width != 0 ? compute_width(basic_string_view<Char>(data, size)) : 0; |
| 1659 | return write_padded(out, specs, size, width, |
| 1660 | [=](reserve_iterator<OutputIt> it) { |
| 1661 | return copy_str<Char>(data, data + size, it); |
| 1662 | }); |
| 1663 | } |
| 1664 | template <typename Char, typename OutputIt> |
| 1665 | FMT_CONSTEXPR auto write(OutputIt out, |
| 1666 | basic_string_view<type_identity_t<Char>> s, |
| 1667 | const basic_format_specs<Char>& specs, locale_ref) |
| 1668 | -> OutputIt { |
| 1669 | check_string_type_spec(specs.type); |
| 1670 | return write(out, s, specs); |
| 1671 | } |
| 1672 | template <typename Char, typename OutputIt> |
| 1673 | FMT_CONSTEXPR auto write(OutputIt out, const Char* s, |
| 1674 | const basic_format_specs<Char>& specs, locale_ref) |
| 1675 | -> OutputIt { |
| 1676 | return check_cstring_type_spec(specs.type) |
| 1677 | ? write(out, basic_string_view<Char>(s), specs, {}) |
| 1678 | : write_ptr<Char>(out, to_uintptr(s), &specs); |
| 1679 | } |
| 1680 | |
| 1681 | template <typename Char, typename OutputIt> |
| 1682 | FMT_CONSTEXPR20 auto write_nonfinite(OutputIt out, bool isinf, |
| 1683 | basic_format_specs<Char> specs, |
| 1684 | const float_specs& fspecs) -> OutputIt { |
| 1685 | auto str = |
| 1686 | isinf ? (fspecs.upper ? "INF" : "inf") : (fspecs.upper ? "NAN" : "nan"); |
| 1687 | constexpr size_t str_size = 3; |
| 1688 | auto sign = fspecs.sign; |
| 1689 | auto size = str_size + (sign ? 1 : 0); |
| 1690 | // Replace '0'-padding with space for non-finite values. |
| 1691 | const bool is_zero_fill = |
| 1692 | specs.fill.size() == 1 && *specs.fill.data() == static_cast<Char>('0'); |
| 1693 | if (is_zero_fill) specs.fill[0] = static_cast<Char>(' '); |
| 1694 | return write_padded(out, specs, size, [=](reserve_iterator<OutputIt> it) { |
| 1695 | if (sign) *it++ = detail::sign<Char>(sign); |
| 1696 | return copy_str<Char>(str, str + str_size, it); |
| 1697 | }); |
| 1698 | } |
| 1699 | |
| 1700 | // A decimal floating-point number significand * pow(10, exp). |
| 1701 | struct big_decimal_fp { |
| 1702 | const char* significand; |
| 1703 | int significand_size; |
| 1704 | int exponent; |
| 1705 | }; |
| 1706 | |
| 1707 | constexpr auto get_significand_size(const big_decimal_fp& fp) -> int { |
| 1708 | return fp.significand_size; |
| 1709 | } |
| 1710 | template <typename T> |
| 1711 | inline auto get_significand_size(const dragonbox::decimal_fp<T>& fp) -> int { |
| 1712 | return count_digits(fp.significand); |
| 1713 | } |
| 1714 | |
| 1715 | template <typename Char, typename OutputIt> |
| 1716 | constexpr auto write_significand(OutputIt out, const char* significand, |
| 1717 | int significand_size) -> OutputIt { |
| 1718 | return copy_str<Char>(significand, significand + significand_size, out); |
| 1719 | } |
| 1720 | template <typename Char, typename OutputIt, typename UInt> |
| 1721 | inline auto write_significand(OutputIt out, UInt significand, |
| 1722 | int significand_size) -> OutputIt { |
| 1723 | return format_decimal<Char>(out, significand, significand_size).end; |
| 1724 | } |
| 1725 | template <typename Char, typename OutputIt, typename T, typename Grouping> |
| 1726 | FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand, |
| 1727 | int significand_size, int exponent, |
| 1728 | const Grouping& grouping) -> OutputIt { |
| 1729 | if (!grouping.separator()) { |
| 1730 | out = write_significand<Char>(out, significand, significand_size); |
| 1731 | return detail::fill_n(out, exponent, static_cast<Char>('0')); |
| 1732 | } |
| 1733 | auto buffer = memory_buffer(); |
| 1734 | write_significand<char>(appender(buffer), significand, significand_size); |
| 1735 | detail::fill_n(appender(buffer), exponent, '0'); |
| 1736 | return grouping.apply(out, string_view(buffer.data(), buffer.size())); |
| 1737 | } |
| 1738 | |
| 1739 | template <typename Char, typename UInt, |
| 1740 | FMT_ENABLE_IF(std::is_integral<UInt>::value)> |
| 1741 | inline auto write_significand(Char* out, UInt significand, int significand_size, |
| 1742 | int integral_size, Char decimal_point) -> Char* { |
| 1743 | if (!decimal_point) |
| 1744 | return format_decimal(out, significand, significand_size).end; |
| 1745 | out += significand_size + 1; |
| 1746 | Char* end = out; |
| 1747 | int floating_size = significand_size - integral_size; |
| 1748 | for (int i = floating_size / 2; i > 0; --i) { |
| 1749 | out -= 2; |
| 1750 | copy2(out, digits2(significand % 100)); |
| 1751 | significand /= 100; |
| 1752 | } |
| 1753 | if (floating_size % 2 != 0) { |
| 1754 | *--out = static_cast<Char>('0' + significand % 10); |
| 1755 | significand /= 10; |
| 1756 | } |
| 1757 | *--out = decimal_point; |
| 1758 | format_decimal(out - integral_size, significand, integral_size); |
| 1759 | return end; |
| 1760 | } |
| 1761 | |
| 1762 | template <typename OutputIt, typename UInt, typename Char, |
| 1763 | FMT_ENABLE_IF(!std::is_pointer<remove_cvref_t<OutputIt>>::value)> |
| 1764 | inline auto write_significand(OutputIt out, UInt significand, |
| 1765 | int significand_size, int integral_size, |
| 1766 | Char decimal_point) -> OutputIt { |
| 1767 | // Buffer is large enough to hold digits (digits10 + 1) and a decimal point. |
| 1768 | Char buffer[digits10<UInt>() + 2]; |
| 1769 | auto end = write_significand(buffer, significand, significand_size, |
| 1770 | integral_size, decimal_point); |
| 1771 | return detail::copy_str_noinline<Char>(buffer, end, out); |
| 1772 | } |
| 1773 | |
| 1774 | template <typename OutputIt, typename Char> |
| 1775 | FMT_CONSTEXPR auto write_significand(OutputIt out, const char* significand, |
| 1776 | int significand_size, int integral_size, |
| 1777 | Char decimal_point) -> OutputIt { |
| 1778 | out = detail::copy_str_noinline<Char>(significand, |
| 1779 | significand + integral_size, out); |
| 1780 | if (!decimal_point) return out; |
| 1781 | *out++ = decimal_point; |
| 1782 | return detail::copy_str_noinline<Char>(significand + integral_size, |
| 1783 | significand + significand_size, out); |
| 1784 | } |
| 1785 | |
| 1786 | template <typename OutputIt, typename Char, typename T, typename Grouping> |
| 1787 | FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand, |
| 1788 | int significand_size, int integral_size, |
| 1789 | Char decimal_point, |
| 1790 | const Grouping& grouping) -> OutputIt { |
| 1791 | if (!grouping.separator()) { |
| 1792 | return write_significand(out, significand, significand_size, integral_size, |
| 1793 | decimal_point); |
| 1794 | } |
| 1795 | auto buffer = basic_memory_buffer<Char>(); |
| 1796 | write_significand(buffer_appender<Char>(buffer), significand, |
| 1797 | significand_size, integral_size, decimal_point); |
| 1798 | grouping.apply( |
| 1799 | out, basic_string_view<Char>(buffer.data(), to_unsigned(integral_size))); |
| 1800 | return detail::copy_str_noinline<Char>(buffer.data() + integral_size, |
| 1801 | buffer.end(), out); |
| 1802 | } |
| 1803 | |
| 1804 | template <typename OutputIt, typename DecimalFP, typename Char, |
| 1805 | typename Grouping = digit_grouping<Char>> |
| 1806 | FMT_CONSTEXPR20 auto do_write_float(OutputIt out, const DecimalFP& fp, |
| 1807 | const basic_format_specs<Char>& specs, |
| 1808 | float_specs fspecs, locale_ref loc) |
| 1809 | -> OutputIt { |
| 1810 | auto significand = fp.significand; |
| 1811 | int significand_size = get_significand_size(fp); |
| 1812 | constexpr Char zero = static_cast<Char>('0'); |
| 1813 | auto sign = fspecs.sign; |
| 1814 | size_t size = to_unsigned(significand_size) + (sign ? 1 : 0); |
| 1815 | using iterator = reserve_iterator<OutputIt>; |
| 1816 | |
| 1817 | Char decimal_point = |
| 1818 | fspecs.locale ? detail::decimal_point<Char>(loc) : static_cast<Char>('.'); |
| 1819 | |
| 1820 | int output_exp = fp.exponent + significand_size - 1; |
| 1821 | auto use_exp_format = [=]() { |
| 1822 | if (fspecs.format == float_format::exp) return true; |
| 1823 | if (fspecs.format != float_format::general) return false; |
| 1824 | // Use the fixed notation if the exponent is in [exp_lower, exp_upper), |
| 1825 | // e.g. 0.0001 instead of 1e-04. Otherwise use the exponent notation. |
| 1826 | const int exp_lower = -4, exp_upper = 16; |
| 1827 | return output_exp < exp_lower || |
| 1828 | output_exp >= (fspecs.precision > 0 ? fspecs.precision : exp_upper); |
| 1829 | }; |
| 1830 | if (use_exp_format()) { |
| 1831 | int num_zeros = 0; |
| 1832 | if (fspecs.showpoint) { |
| 1833 | num_zeros = fspecs.precision - significand_size; |
| 1834 | if (num_zeros < 0) num_zeros = 0; |
| 1835 | size += to_unsigned(num_zeros); |
| 1836 | } else if (significand_size == 1) { |
| 1837 | decimal_point = Char(); |
| 1838 | } |
| 1839 | auto abs_output_exp = output_exp >= 0 ? output_exp : -output_exp; |
| 1840 | int exp_digits = 2; |
| 1841 | if (abs_output_exp >= 100) exp_digits = abs_output_exp >= 1000 ? 4 : 3; |
| 1842 | |
| 1843 | size += to_unsigned((decimal_point ? 1 : 0) + 2 + exp_digits); |
| 1844 | char exp_char = fspecs.upper ? 'E' : 'e'; |
| 1845 | auto write = [=](iterator it) { |
| 1846 | if (sign) *it++ = detail::sign<Char>(sign); |
| 1847 | // Insert a decimal point after the first digit and add an exponent. |
| 1848 | it = write_significand(it, significand, significand_size, 1, |
| 1849 | decimal_point); |
| 1850 | if (num_zeros > 0) it = detail::fill_n(it, num_zeros, zero); |
| 1851 | *it++ = static_cast<Char>(exp_char); |
| 1852 | return write_exponent<Char>(output_exp, it); |
| 1853 | }; |
| 1854 | return specs.width > 0 ? write_padded<align::right>(out, specs, size, write) |
| 1855 | : base_iterator(out, write(reserve(out, size))); |
| 1856 | } |
| 1857 | |
| 1858 | int exp = fp.exponent + significand_size; |
| 1859 | if (fp.exponent >= 0) { |
| 1860 | // 1234e5 -> 123400000[.0+] |
| 1861 | size += to_unsigned(fp.exponent); |
| 1862 | int num_zeros = fspecs.precision - exp; |
| 1863 | #ifdef FMT_FUZZ |
| 1864 | if (num_zeros > 5000) |
| 1865 | throw std::runtime_error("fuzz mode - avoiding excessive cpu use"); |
| 1866 | #endif |
| 1867 | if (fspecs.showpoint) { |
| 1868 | if (num_zeros <= 0 && fspecs.format != float_format::fixed) num_zeros = 1; |
| 1869 | if (num_zeros > 0) size += to_unsigned(num_zeros) + 1; |
| 1870 | } |
| 1871 | auto grouping = Grouping(loc, fspecs.locale); |
| 1872 | size += to_unsigned(grouping.count_separators(significand_size)); |
| 1873 | return write_padded<align::right>(out, specs, size, [&](iterator it) { |
| 1874 | if (sign) *it++ = detail::sign<Char>(sign); |
| 1875 | it = write_significand<Char>(it, significand, significand_size, |
| 1876 | fp.exponent, grouping); |
| 1877 | if (!fspecs.showpoint) return it; |
| 1878 | *it++ = decimal_point; |
| 1879 | return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it; |
| 1880 | }); |
| 1881 | } else if (exp > 0) { |
| 1882 | // 1234e-2 -> 12.34[0+] |
| 1883 | int num_zeros = fspecs.showpoint ? fspecs.precision - significand_size : 0; |
| 1884 | size += 1 + to_unsigned(num_zeros > 0 ? num_zeros : 0); |
| 1885 | auto grouping = Grouping(loc, fspecs.locale); |
| 1886 | size += to_unsigned(grouping.count_separators(significand_size)); |
| 1887 | return write_padded<align::right>(out, specs, size, [&](iterator it) { |
| 1888 | if (sign) *it++ = detail::sign<Char>(sign); |
| 1889 | it = write_significand(it, significand, significand_size, exp, |
| 1890 | decimal_point, grouping); |
| 1891 | return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it; |
| 1892 | }); |
| 1893 | } |
| 1894 | // 1234e-6 -> 0.001234 |
| 1895 | int num_zeros = -exp; |
| 1896 | if (significand_size == 0 && fspecs.precision >= 0 && |
| 1897 | fspecs.precision < num_zeros) { |
| 1898 | num_zeros = fspecs.precision; |
| 1899 | } |
| 1900 | bool pointy = num_zeros != 0 || significand_size != 0 || fspecs.showpoint; |
| 1901 | size += 1 + (pointy ? 1 : 0) + to_unsigned(num_zeros); |
| 1902 | return write_padded<align::right>(out, specs, size, [&](iterator it) { |
| 1903 | if (sign) *it++ = detail::sign<Char>(sign); |
| 1904 | *it++ = zero; |
| 1905 | if (!pointy) return it; |
| 1906 | *it++ = decimal_point; |
| 1907 | it = detail::fill_n(it, num_zeros, zero); |
| 1908 | return write_significand<Char>(it, significand, significand_size); |
| 1909 | }); |
| 1910 | } |
| 1911 | |
| 1912 | template <typename Char> class fallback_digit_grouping { |
| 1913 | public: |
| 1914 | constexpr fallback_digit_grouping(locale_ref, bool) {} |
| 1915 | |
| 1916 | constexpr Char separator() const { return Char(); } |
| 1917 | |
| 1918 | constexpr int count_separators(int) const { return 0; } |
| 1919 | |
| 1920 | template <typename Out, typename C> |
| 1921 | constexpr Out apply(Out out, basic_string_view<C>) const { |
| 1922 | return out; |
| 1923 | } |
| 1924 | }; |
| 1925 | |
| 1926 | template <typename OutputIt, typename DecimalFP, typename Char> |
| 1927 | FMT_CONSTEXPR20 auto write_float(OutputIt out, const DecimalFP& fp, |
| 1928 | const basic_format_specs<Char>& specs, |
| 1929 | float_specs fspecs, locale_ref loc) |
| 1930 | -> OutputIt { |
| 1931 | if (is_constant_evaluated()) { |
| 1932 | return do_write_float<OutputIt, DecimalFP, Char, |
| 1933 | fallback_digit_grouping<Char>>(out, fp, specs, fspecs, |
| 1934 | loc); |
| 1935 | } else { |
| 1936 | return do_write_float(out, fp, specs, fspecs, loc); |
| 1937 | } |
| 1938 | } |
| 1939 | |
| 1940 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 1941 | FMT_CONSTEXPR20 bool isinf(T value) { |
| 1942 | if (is_constant_evaluated()) { |
| 1943 | #if defined(__cpp_if_constexpr) |
| 1944 | if constexpr (std::numeric_limits<double>::is_iec559) { |
| 1945 | auto bits = detail::bit_cast<uint64_t>(static_cast<double>(value)); |
| 1946 | constexpr auto significand_bits = |
| 1947 | dragonbox::float_info<double>::significand_bits; |
| 1948 | return (bits & exponent_mask<double>()) && |
| 1949 | !(bits & ((uint64_t(1) << significand_bits) - 1)); |
| 1950 | } |
| 1951 | #endif |
| 1952 | } |
| 1953 | return std::isinf(value); |
| 1954 | } |
| 1955 | |
| 1956 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 1957 | FMT_CONSTEXPR20 bool isfinite(T value) { |
| 1958 | if (is_constant_evaluated()) { |
| 1959 | #if defined(__cpp_if_constexpr) |
| 1960 | if constexpr (std::numeric_limits<double>::is_iec559) { |
| 1961 | auto bits = detail::bit_cast<uint64_t>(static_cast<double>(value)); |
| 1962 | return (bits & exponent_mask<double>()) != exponent_mask<double>(); |
| 1963 | } |
| 1964 | #endif |
| 1965 | } |
| 1966 | return std::isfinite(value); |
| 1967 | } |
| 1968 | |
| 1969 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 1970 | FMT_INLINE FMT_CONSTEXPR bool signbit(T value) { |
| 1971 | if (is_constant_evaluated()) { |
| 1972 | #ifdef __cpp_if_constexpr |
| 1973 | if constexpr (std::numeric_limits<double>::is_iec559) { |
| 1974 | auto bits = detail::bit_cast<uint64_t>(static_cast<double>(value)); |
| 1975 | return (bits & (uint64_t(1) << (num_bits<uint64_t>() - 1))) != 0; |
| 1976 | } |
| 1977 | #endif |
| 1978 | } |
| 1979 | return std::signbit(value); |
| 1980 | } |
| 1981 | |
| 1982 | template <typename Char, typename OutputIt, typename T, |
| 1983 | FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 1984 | FMT_CONSTEXPR20 auto write(OutputIt out, T value, |
| 1985 | basic_format_specs<Char> specs, locale_ref loc = {}) |
| 1986 | -> OutputIt { |
| 1987 | if (const_check(!is_supported_floating_point(value))) return out; |
| 1988 | float_specs fspecs = parse_float_type_spec(specs); |
| 1989 | fspecs.sign = specs.sign; |
| 1990 | if (detail::signbit(value)) { // value < 0 is false for NaN so use signbit. |
| 1991 | fspecs.sign = sign::minus; |
| 1992 | value = -value; |
| 1993 | } else if (fspecs.sign == sign::minus) { |
| 1994 | fspecs.sign = sign::none; |
| 1995 | } |
| 1996 | |
| 1997 | if (!detail::isfinite(value)) |
| 1998 | return write_nonfinite(out, detail::isinf(value), specs, fspecs); |
| 1999 | |
| 2000 | if (specs.align == align::numeric && fspecs.sign) { |
| 2001 | auto it = reserve(out, 1); |
| 2002 | *it++ = detail::sign<Char>(fspecs.sign); |
| 2003 | out = base_iterator(out, it); |
| 2004 | fspecs.sign = sign::none; |
| 2005 | if (specs.width != 0) --specs.width; |
| 2006 | } |
| 2007 | |
| 2008 | memory_buffer buffer; |
| 2009 | if (fspecs.format == float_format::hex) { |
| 2010 | if (fspecs.sign) buffer.push_back(detail::sign<char>(fspecs.sign)); |
| 2011 | snprintf_float(promote_float(value), specs.precision, fspecs, buffer); |
| 2012 | return write_bytes<align::right>(out, {buffer.data(), buffer.size()}, |
| 2013 | specs); |
| 2014 | } |
| 2015 | int precision = specs.precision >= 0 || specs.type == presentation_type::none |
| 2016 | ? specs.precision |
| 2017 | : 6; |
| 2018 | if (fspecs.format == float_format::exp) { |
| 2019 | if (precision == max_value<int>()) |
| 2020 | throw_format_error("number is too big"); |
| 2021 | else |
| 2022 | ++precision; |
| 2023 | } |
| 2024 | if (const_check(std::is_same<T, float>())) fspecs.binary32 = true; |
| 2025 | if (!is_fast_float<T>()) fspecs.fallback = true; |
| 2026 | int exp = format_float(promote_float(value), precision, fspecs, buffer); |
| 2027 | fspecs.precision = precision; |
| 2028 | auto fp = big_decimal_fp{buffer.data(), static_cast<int>(buffer.size()), exp}; |
| 2029 | return write_float(out, fp, specs, fspecs, loc); |
| 2030 | } |
| 2031 | |
| 2032 | template <typename Char, typename OutputIt, typename T, |
| 2033 | FMT_ENABLE_IF(is_fast_float<T>::value)> |
| 2034 | FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt { |
| 2035 | if (is_constant_evaluated()) { |
| 2036 | return write(out, value, basic_format_specs<Char>()); |
| 2037 | } |
| 2038 | |
| 2039 | if (const_check(!is_supported_floating_point(value))) return out; |
| 2040 | |
| 2041 | using floaty = conditional_t<std::is_same<T, long double>::value, double, T>; |
| 2042 | using uint = typename dragonbox::float_info<floaty>::carrier_uint; |
| 2043 | auto bits = bit_cast<uint>(value); |
| 2044 | |
| 2045 | auto fspecs = float_specs(); |
| 2046 | if (detail::signbit(value)) { |
| 2047 | fspecs.sign = sign::minus; |
| 2048 | value = -value; |
| 2049 | } |
| 2050 | |
| 2051 | constexpr auto specs = basic_format_specs<Char>(); |
| 2052 | uint mask = exponent_mask<floaty>(); |
| 2053 | if ((bits & mask) == mask) |
| 2054 | return write_nonfinite(out, std::isinf(value), specs, fspecs); |
| 2055 | |
| 2056 | auto dec = dragonbox::to_decimal(static_cast<floaty>(value)); |
| 2057 | return write_float(out, dec, specs, fspecs, {}); |
| 2058 | } |
| 2059 | |
| 2060 | template <typename Char, typename OutputIt, typename T, |
| 2061 | FMT_ENABLE_IF(std::is_floating_point<T>::value && |
| 2062 | !is_fast_float<T>::value)> |
| 2063 | inline auto write(OutputIt out, T value) -> OutputIt { |
| 2064 | return write(out, value, basic_format_specs<Char>()); |
| 2065 | } |
| 2066 | |
| 2067 | template <typename Char, typename OutputIt> |
| 2068 | auto write(OutputIt out, monostate, basic_format_specs<Char> = {}, |
| 2069 | locale_ref = {}) -> OutputIt { |
| 2070 | FMT_ASSERT(false, ""); |
| 2071 | return out; |
| 2072 | } |
| 2073 | |
| 2074 | template <typename Char, typename OutputIt> |
| 2075 | FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> value) |
| 2076 | -> OutputIt { |
| 2077 | auto it = reserve(out, value.size()); |
| 2078 | it = copy_str_noinline<Char>(value.begin(), value.end(), it); |
| 2079 | return base_iterator(out, it); |
| 2080 | } |
| 2081 | |
| 2082 | template <typename Char, typename OutputIt, typename T, |
| 2083 | FMT_ENABLE_IF(is_string<T>::value)> |
| 2084 | constexpr auto write(OutputIt out, const T& value) -> OutputIt { |
| 2085 | return write<Char>(out, to_string_view(value)); |
| 2086 | } |
| 2087 | |
| 2088 | template <typename Char, typename OutputIt, typename T, |
| 2089 | FMT_ENABLE_IF(is_integral<T>::value && |
| 2090 | !std::is_same<T, bool>::value && |
| 2091 | !std::is_same<T, Char>::value)> |
| 2092 | FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt { |
| 2093 | auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(value); |
| 2094 | bool negative = is_negative(value); |
| 2095 | // Don't do -abs_value since it trips unsigned-integer-overflow sanitizer. |
| 2096 | if (negative) abs_value = ~abs_value + 1; |
| 2097 | int num_digits = count_digits(abs_value); |
| 2098 | auto size = (negative ? 1 : 0) + static_cast<size_t>(num_digits); |
| 2099 | auto it = reserve(out, size); |
| 2100 | if (auto ptr = to_pointer<Char>(it, size)) { |
| 2101 | if (negative) *ptr++ = static_cast<Char>('-'); |
| 2102 | format_decimal<Char>(ptr, abs_value, num_digits); |
| 2103 | return out; |
| 2104 | } |
| 2105 | if (negative) *it++ = static_cast<Char>('-'); |
| 2106 | it = format_decimal<Char>(it, abs_value, num_digits).end; |
| 2107 | return base_iterator(out, it); |
| 2108 | } |
| 2109 | |
| 2110 | // FMT_ENABLE_IF() condition separated to workaround an MSVC bug. |
| 2111 | template < |
| 2112 | typename Char, typename OutputIt, typename T, |
| 2113 | bool check = |
| 2114 | std::is_enum<T>::value && !std::is_same<T, Char>::value && |
| 2115 | mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value != |
| 2116 | type::custom_type, |
| 2117 | FMT_ENABLE_IF(check)> |
| 2118 | FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt { |
| 2119 | return write<Char>( |
| 2120 | out, static_cast<typename std::underlying_type<T>::type>(value)); |
| 2121 | } |
| 2122 | |
| 2123 | template <typename Char, typename OutputIt, typename T, |
| 2124 | FMT_ENABLE_IF(std::is_same<T, bool>::value)> |
| 2125 | FMT_CONSTEXPR auto write(OutputIt out, T value, |
| 2126 | const basic_format_specs<Char>& specs = {}, |
| 2127 | locale_ref = {}) -> OutputIt { |
| 2128 | return specs.type != presentation_type::none && |
| 2129 | specs.type != presentation_type::string |
| 2130 | ? write(out, value ? 1 : 0, specs, {}) |
| 2131 | : write_bytes(out, value ? "true" : "false", specs); |
| 2132 | } |
| 2133 | |
| 2134 | template <typename Char, typename OutputIt> |
| 2135 | FMT_CONSTEXPR auto write(OutputIt out, Char value) -> OutputIt { |
| 2136 | auto it = reserve(out, 1); |
| 2137 | *it++ = value; |
| 2138 | return base_iterator(out, it); |
| 2139 | } |
| 2140 | |
| 2141 | template <typename Char, typename OutputIt> |
| 2142 | FMT_CONSTEXPR_CHAR_TRAITS auto write(OutputIt out, const Char* value) |
| 2143 | -> OutputIt { |
| 2144 | if (!value) { |
| 2145 | throw_format_error("string pointer is null"); |
| 2146 | } else { |
| 2147 | out = write(out, basic_string_view<Char>(value)); |
| 2148 | } |
| 2149 | return out; |
| 2150 | } |
| 2151 | |
| 2152 | template <typename Char, typename OutputIt, typename T, |
| 2153 | FMT_ENABLE_IF(std::is_same<T, void>::value)> |
| 2154 | auto write(OutputIt out, const T* value, |
| 2155 | const basic_format_specs<Char>& specs = {}, locale_ref = {}) |
| 2156 | -> OutputIt { |
| 2157 | check_pointer_type_spec(specs.type, error_handler()); |
| 2158 | return write_ptr<Char>(out, to_uintptr(value), &specs); |
| 2159 | } |
| 2160 | |
| 2161 | // A write overload that handles implicit conversions. |
| 2162 | template <typename Char, typename OutputIt, typename T, |
| 2163 | typename Context = basic_format_context<OutputIt, Char>> |
| 2164 | FMT_CONSTEXPR auto write(OutputIt out, const T& value) -> enable_if_t< |
| 2165 | std::is_class<T>::value && !is_string<T>::value && |
| 2166 | !std::is_same<T, Char>::value && |
| 2167 | !std::is_same<const T&, |
| 2168 | decltype(arg_mapper<Context>().map(value))>::value, |
| 2169 | OutputIt> { |
| 2170 | return write<Char>(out, arg_mapper<Context>().map(value)); |
| 2171 | } |
| 2172 | |
| 2173 | template <typename Char, typename OutputIt, typename T, |
| 2174 | typename Context = basic_format_context<OutputIt, Char>> |
| 2175 | FMT_CONSTEXPR auto write(OutputIt out, const T& value) |
| 2176 | -> enable_if_t<mapped_type_constant<T, Context>::value == type::custom_type, |
| 2177 | OutputIt> { |
| 2178 | using formatter_type = |
| 2179 | conditional_t<has_formatter<T, Context>::value, |
| 2180 | typename Context::template formatter_type<T>, |
| 2181 | fallback_formatter<T, Char>>; |
| 2182 | auto ctx = Context(out, {}, {}); |
| 2183 | return formatter_type().format(value, ctx); |
| 2184 | } |
| 2185 | |
| 2186 | // An argument visitor that formats the argument and writes it via the output |
| 2187 | // iterator. It's a class and not a generic lambda for compatibility with C++11. |
| 2188 | template <typename Char> struct default_arg_formatter { |
| 2189 | using iterator = buffer_appender<Char>; |
| 2190 | using context = buffer_context<Char>; |
| 2191 | |
| 2192 | iterator out; |
| 2193 | basic_format_args<context> args; |
| 2194 | locale_ref loc; |
| 2195 | |
| 2196 | template <typename T> auto operator()(T value) -> iterator { |
| 2197 | return write<Char>(out, value); |
| 2198 | } |
| 2199 | auto operator()(typename basic_format_arg<context>::handle h) -> iterator { |
| 2200 | basic_format_parse_context<Char> parse_ctx({}); |
| 2201 | context format_ctx(out, args, loc); |
| 2202 | h.format(parse_ctx, format_ctx); |
| 2203 | return format_ctx.out(); |
| 2204 | } |
| 2205 | }; |
| 2206 | |
| 2207 | template <typename Char> struct arg_formatter { |
| 2208 | using iterator = buffer_appender<Char>; |
| 2209 | using context = buffer_context<Char>; |
| 2210 | |
| 2211 | iterator out; |
| 2212 | const basic_format_specs<Char>& specs; |
| 2213 | locale_ref locale; |
| 2214 | |
| 2215 | template <typename T> |
| 2216 | FMT_CONSTEXPR FMT_INLINE auto operator()(T value) -> iterator { |
| 2217 | return detail::write(out, value, specs, locale); |
| 2218 | } |
| 2219 | auto operator()(typename basic_format_arg<context>::handle) -> iterator { |
| 2220 | // User-defined types are handled separately because they require access |
| 2221 | // to the parse context. |
| 2222 | return out; |
| 2223 | } |
| 2224 | }; |
| 2225 | |
| 2226 | template <typename Char> struct custom_formatter { |
| 2227 | basic_format_parse_context<Char>& parse_ctx; |
| 2228 | buffer_context<Char>& ctx; |
| 2229 | |
| 2230 | void operator()( |
| 2231 | typename basic_format_arg<buffer_context<Char>>::handle h) const { |
| 2232 | h.format(parse_ctx, ctx); |
| 2233 | } |
| 2234 | template <typename T> void operator()(T) const {} |
| 2235 | }; |
| 2236 | |
| 2237 | template <typename T> |
| 2238 | using is_integer = |
| 2239 | bool_constant<is_integral<T>::value && !std::is_same<T, bool>::value && |
| 2240 | !std::is_same<T, char>::value && |
| 2241 | !std::is_same<T, wchar_t>::value>; |
| 2242 | |
| 2243 | template <typename ErrorHandler> class width_checker { |
| 2244 | public: |
| 2245 | explicit FMT_CONSTEXPR width_checker(ErrorHandler& eh) : handler_(eh) {} |
| 2246 | |
| 2247 | template <typename T, FMT_ENABLE_IF(is_integer<T>::value)> |
| 2248 | FMT_CONSTEXPR auto operator()(T value) -> unsigned long long { |
| 2249 | if (is_negative(value)) handler_.on_error("negative width"); |
| 2250 | return static_cast<unsigned long long>(value); |
| 2251 | } |
| 2252 | |
| 2253 | template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)> |
| 2254 | FMT_CONSTEXPR auto operator()(T) -> unsigned long long { |
| 2255 | handler_.on_error("width is not integer"); |
| 2256 | return 0; |
| 2257 | } |
| 2258 | |
| 2259 | private: |
| 2260 | ErrorHandler& handler_; |
| 2261 | }; |
| 2262 | |
| 2263 | template <typename ErrorHandler> class precision_checker { |
| 2264 | public: |
| 2265 | explicit FMT_CONSTEXPR precision_checker(ErrorHandler& eh) : handler_(eh) {} |
| 2266 | |
| 2267 | template <typename T, FMT_ENABLE_IF(is_integer<T>::value)> |
| 2268 | FMT_CONSTEXPR auto operator()(T value) -> unsigned long long { |
| 2269 | if (is_negative(value)) handler_.on_error("negative precision"); |
| 2270 | return static_cast<unsigned long long>(value); |
| 2271 | } |
| 2272 | |
| 2273 | template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)> |
| 2274 | FMT_CONSTEXPR auto operator()(T) -> unsigned long long { |
| 2275 | handler_.on_error("precision is not integer"); |
| 2276 | return 0; |
| 2277 | } |
| 2278 | |
| 2279 | private: |
| 2280 | ErrorHandler& handler_; |
| 2281 | }; |
| 2282 | |
| 2283 | template <template <typename> class Handler, typename FormatArg, |
| 2284 | typename ErrorHandler> |
| 2285 | FMT_CONSTEXPR auto get_dynamic_spec(FormatArg arg, ErrorHandler eh) -> int { |
| 2286 | unsigned long long value = visit_format_arg(Handler<ErrorHandler>(eh), arg); |
| 2287 | if (value > to_unsigned(max_value<int>())) eh.on_error("number is too big"); |
| 2288 | return static_cast<int>(value); |
| 2289 | } |
| 2290 | |
| 2291 | template <typename Context, typename ID> |
| 2292 | FMT_CONSTEXPR auto get_arg(Context& ctx, ID id) -> |
| 2293 | typename Context::format_arg { |
| 2294 | auto arg = ctx.arg(id); |
| 2295 | if (!arg) ctx.on_error("argument not found"); |
| 2296 | return arg; |
| 2297 | } |
| 2298 | |
| 2299 | // The standard format specifier handler with checking. |
| 2300 | template <typename Char> class specs_handler : public specs_setter<Char> { |
| 2301 | private: |
| 2302 | basic_format_parse_context<Char>& parse_context_; |
| 2303 | buffer_context<Char>& context_; |
| 2304 | |
| 2305 | // This is only needed for compatibility with gcc 4.4. |
| 2306 | using format_arg = basic_format_arg<buffer_context<Char>>; |
| 2307 | |
| 2308 | FMT_CONSTEXPR auto get_arg(auto_id) -> format_arg { |
| 2309 | return detail::get_arg(context_, parse_context_.next_arg_id()); |
| 2310 | } |
| 2311 | |
| 2312 | FMT_CONSTEXPR auto get_arg(int arg_id) -> format_arg { |
| 2313 | parse_context_.check_arg_id(arg_id); |
| 2314 | return detail::get_arg(context_, arg_id); |
| 2315 | } |
| 2316 | |
| 2317 | FMT_CONSTEXPR auto get_arg(basic_string_view<Char> arg_id) -> format_arg { |
| 2318 | parse_context_.check_arg_id(arg_id); |
| 2319 | return detail::get_arg(context_, arg_id); |
| 2320 | } |
| 2321 | |
| 2322 | public: |
| 2323 | FMT_CONSTEXPR specs_handler(basic_format_specs<Char>& specs, |
| 2324 | basic_format_parse_context<Char>& parse_ctx, |
| 2325 | buffer_context<Char>& ctx) |
| 2326 | : specs_setter<Char>(specs), parse_context_(parse_ctx), context_(ctx) {} |
| 2327 | |
| 2328 | template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
| 2329 | this->specs_.width = get_dynamic_spec<width_checker>( |
| 2330 | get_arg(arg_id), context_.error_handler()); |
| 2331 | } |
| 2332 | |
| 2333 | template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
| 2334 | this->specs_.precision = get_dynamic_spec<precision_checker>( |
| 2335 | get_arg(arg_id), context_.error_handler()); |
| 2336 | } |
| 2337 | |
| 2338 | void on_error(const char* message) { context_.on_error(message); } |
| 2339 | }; |
| 2340 | |
| 2341 | template <template <typename> class Handler, typename Context> |
| 2342 | FMT_CONSTEXPR void handle_dynamic_spec(int& value, |
| 2343 | arg_ref<typename Context::char_type> ref, |
| 2344 | Context& ctx) { |
| 2345 | switch (ref.kind) { |
| 2346 | case arg_id_kind::none: |
| 2347 | break; |
| 2348 | case arg_id_kind::index: |
| 2349 | value = detail::get_dynamic_spec<Handler>(ctx.arg(ref.val.index), |
| 2350 | ctx.error_handler()); |
| 2351 | break; |
| 2352 | case arg_id_kind::name: |
| 2353 | value = detail::get_dynamic_spec<Handler>(ctx.arg(ref.val.name), |
| 2354 | ctx.error_handler()); |
| 2355 | break; |
| 2356 | } |
| 2357 | } |
| 2358 | |
| 2359 | #define FMT_STRING_IMPL(s, base, explicit) \ |
| 2360 | [] { \ |
| 2361 | /* Use the hidden visibility as a workaround for a GCC bug (#1973). */ \ |
| 2362 | /* Use a macro-like name to avoid shadowing warnings. */ \ |
| 2363 | struct FMT_GCC_VISIBILITY_HIDDEN FMT_COMPILE_STRING : base { \ |
| 2364 | using char_type = fmt::remove_cvref_t<decltype(s[0])>; \ |
| 2365 | FMT_MAYBE_UNUSED FMT_CONSTEXPR explicit \ |
| 2366 | operator fmt::basic_string_view<char_type>() const { \ |
| 2367 | return fmt::detail_exported::compile_string_to_view<char_type>(s); \ |
| 2368 | } \ |
| 2369 | }; \ |
| 2370 | return FMT_COMPILE_STRING(); \ |
| 2371 | }() |
| 2372 | |
| 2373 | /** |
| 2374 | \rst |
| 2375 | Constructs a compile-time format string from a string literal *s*. |
| 2376 | |
| 2377 | **Example**:: |
| 2378 | |
| 2379 | // A compile-time error because 'd' is an invalid specifier for strings. |
| 2380 | std::string s = fmt::format(FMT_STRING("{:d}"), "foo"); |
| 2381 | \endrst |
| 2382 | */ |
| 2383 | #define FMT_STRING(s) FMT_STRING_IMPL(s, fmt::compile_string, ) |
| 2384 | |
| 2385 | #if FMT_USE_USER_DEFINED_LITERALS |
| 2386 | template <typename Char> struct udl_formatter { |
| 2387 | basic_string_view<Char> str; |
| 2388 | |
| 2389 | template <typename... T> |
| 2390 | auto operator()(T&&... args) const -> std::basic_string<Char> { |
| 2391 | return vformat(str, fmt::make_args_checked<T...>(str, args...)); |
| 2392 | } |
| 2393 | }; |
| 2394 | |
| 2395 | # if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS |
| 2396 | template <typename T, typename Char, size_t N, |
| 2397 | fmt::detail_exported::fixed_string<Char, N> Str> |
| 2398 | struct statically_named_arg : view { |
| 2399 | static constexpr auto name = Str.data; |
| 2400 | |
| 2401 | const T& value; |
| 2402 | statically_named_arg(const T& v) : value(v) {} |
| 2403 | }; |
| 2404 | |
| 2405 | template <typename T, typename Char, size_t N, |
| 2406 | fmt::detail_exported::fixed_string<Char, N> Str> |
| 2407 | struct is_named_arg<statically_named_arg<T, Char, N, Str>> : std::true_type {}; |
| 2408 | |
| 2409 | template <typename T, typename Char, size_t N, |
| 2410 | fmt::detail_exported::fixed_string<Char, N> Str> |
| 2411 | struct is_statically_named_arg<statically_named_arg<T, Char, N, Str>> |
| 2412 | : std::true_type {}; |
| 2413 | |
| 2414 | template <typename Char, size_t N, |
| 2415 | fmt::detail_exported::fixed_string<Char, N> Str> |
| 2416 | struct udl_arg { |
| 2417 | template <typename T> auto operator=(T&& value) const { |
| 2418 | return statically_named_arg<T, Char, N, Str>(std::forward<T>(value)); |
| 2419 | } |
| 2420 | }; |
| 2421 | # else |
| 2422 | template <typename Char> struct udl_arg { |
| 2423 | const Char* str; |
| 2424 | |
| 2425 | template <typename T> auto operator=(T&& value) const -> named_arg<Char, T> { |
| 2426 | return {str, std::forward<T>(value)}; |
| 2427 | } |
| 2428 | }; |
| 2429 | # endif |
| 2430 | #endif // FMT_USE_USER_DEFINED_LITERALS |
| 2431 | |
| 2432 | template <typename Locale, typename Char> |
| 2433 | auto vformat(const Locale& loc, basic_string_view<Char> format_str, |
| 2434 | basic_format_args<buffer_context<type_identity_t<Char>>> args) |
| 2435 | -> std::basic_string<Char> { |
| 2436 | basic_memory_buffer<Char> buffer; |
| 2437 | detail::vformat_to(buffer, format_str, args, detail::locale_ref(loc)); |
| 2438 | return {buffer.data(), buffer.size()}; |
| 2439 | } |
| 2440 | |
| 2441 | using format_func = void (*)(detail::buffer<char>&, int, const char*); |
| 2442 | |
| 2443 | FMT_API void format_error_code(buffer<char>& out, int error_code, |
| 2444 | string_view message) FMT_NOEXCEPT; |
| 2445 | |
| 2446 | FMT_API void report_error(format_func func, int error_code, |
| 2447 | const char* message) FMT_NOEXCEPT; |
| 2448 | FMT_END_DETAIL_NAMESPACE |
| 2449 | |
| 2450 | FMT_API auto vsystem_error(int error_code, string_view format_str, |
| 2451 | format_args args) -> std::system_error; |
| 2452 | |
| 2453 | /** |
| 2454 | \rst |
| 2455 | Constructs :class:`std::system_error` with a message formatted with |
| 2456 | ``fmt::format(fmt, args...)``. |
| 2457 | *error_code* is a system error code as given by ``errno``. |
| 2458 | |
| 2459 | **Example**:: |
| 2460 | |
| 2461 | // This throws std::system_error with the description |
| 2462 | // cannot open file 'madeup': No such file or directory |
| 2463 | // or similar (system message may vary). |
| 2464 | const char* filename = "madeup"; |
| 2465 | std::FILE* file = std::fopen(filename, "r"); |
| 2466 | if (!file) |
| 2467 | throw fmt::system_error(errno, "cannot open file '{}'", filename); |
| 2468 | \endrst |
| 2469 | */ |
| 2470 | template <typename... T> |
| 2471 | auto system_error(int error_code, format_string<T...> fmt, T&&... args) |
| 2472 | -> std::system_error { |
| 2473 | return vsystem_error(error_code, fmt, fmt::make_format_args(args...)); |
| 2474 | } |
| 2475 | |
| 2476 | /** |
| 2477 | \rst |
| 2478 | Formats an error message for an error returned by an operating system or a |
| 2479 | language runtime, for example a file opening error, and writes it to *out*. |
| 2480 | The format is the same as the one used by ``std::system_error(ec, message)`` |
| 2481 | where ``ec`` is ``std::error_code(error_code, std::generic_category()})``. |
| 2482 | It is implementation-defined but normally looks like: |
| 2483 | |
| 2484 | .. parsed-literal:: |
| 2485 | *<message>*: *<system-message>* |
| 2486 | |
| 2487 | where *<message>* is the passed message and *<system-message>* is the system |
| 2488 | message corresponding to the error code. |
| 2489 | *error_code* is a system error code as given by ``errno``. |
| 2490 | \endrst |
| 2491 | */ |
| 2492 | FMT_API void format_system_error(detail::buffer<char>& out, int error_code, |
| 2493 | const char* message) FMT_NOEXCEPT; |
| 2494 | |
| 2495 | // Reports a system error without throwing an exception. |
| 2496 | // Can be used to report errors from destructors. |
| 2497 | FMT_API void report_system_error(int error_code, |
| 2498 | const char* message) FMT_NOEXCEPT; |
| 2499 | |
| 2500 | /** Fast integer formatter. */ |
| 2501 | class format_int { |
| 2502 | private: |
| 2503 | // Buffer should be large enough to hold all digits (digits10 + 1), |
| 2504 | // a sign and a null character. |
| 2505 | enum { buffer_size = std::numeric_limits<unsigned long long>::digits10 + 3 }; |
| 2506 | mutable char buffer_[buffer_size]; |
| 2507 | char* str_; |
| 2508 | |
| 2509 | template <typename UInt> auto format_unsigned(UInt value) -> char* { |
| 2510 | auto n = static_cast<detail::uint32_or_64_or_128_t<UInt>>(value); |
| 2511 | return detail::format_decimal(buffer_, n, buffer_size - 1).begin; |
| 2512 | } |
| 2513 | |
| 2514 | template <typename Int> auto format_signed(Int value) -> char* { |
| 2515 | auto abs_value = static_cast<detail::uint32_or_64_or_128_t<Int>>(value); |
| 2516 | bool negative = value < 0; |
| 2517 | if (negative) abs_value = 0 - abs_value; |
| 2518 | auto begin = format_unsigned(abs_value); |
| 2519 | if (negative) *--begin = '-'; |
| 2520 | return begin; |
| 2521 | } |
| 2522 | |
| 2523 | public: |
| 2524 | explicit format_int(int value) : str_(format_signed(value)) {} |
| 2525 | explicit format_int(long value) : str_(format_signed(value)) {} |
| 2526 | explicit format_int(long long value) : str_(format_signed(value)) {} |
| 2527 | explicit format_int(unsigned value) : str_(format_unsigned(value)) {} |
| 2528 | explicit format_int(unsigned long value) : str_(format_unsigned(value)) {} |
| 2529 | explicit format_int(unsigned long long value) |
| 2530 | : str_(format_unsigned(value)) {} |
| 2531 | |
| 2532 | /** Returns the number of characters written to the output buffer. */ |
| 2533 | auto size() const -> size_t { |
| 2534 | return detail::to_unsigned(buffer_ - str_ + buffer_size - 1); |
| 2535 | } |
| 2536 | |
| 2537 | /** |
| 2538 | Returns a pointer to the output buffer content. No terminating null |
| 2539 | character is appended. |
| 2540 | */ |
| 2541 | auto data() const -> const char* { return str_; } |
| 2542 | |
| 2543 | /** |
| 2544 | Returns a pointer to the output buffer content with terminating null |
| 2545 | character appended. |
| 2546 | */ |
| 2547 | auto c_str() const -> const char* { |
| 2548 | buffer_[buffer_size - 1] = '\0'; |
| 2549 | return str_; |
| 2550 | } |
| 2551 | |
| 2552 | /** |
| 2553 | \rst |
| 2554 | Returns the content of the output buffer as an ``std::string``. |
| 2555 | \endrst |
| 2556 | */ |
| 2557 | auto str() const -> std::string { return std::string(str_, size()); } |
| 2558 | }; |
| 2559 | |
| 2560 | template <typename T, typename Char> |
| 2561 | template <typename FormatContext> |
| 2562 | FMT_CONSTEXPR FMT_INLINE auto |
| 2563 | formatter<T, Char, |
| 2564 | enable_if_t<detail::type_constant<T, Char>::value != |
| 2565 | detail::type::custom_type>>::format(const T& val, |
| 2566 | FormatContext& ctx) |
| 2567 | const -> decltype(ctx.out()) { |
| 2568 | if (specs_.width_ref.kind != detail::arg_id_kind::none || |
| 2569 | specs_.precision_ref.kind != detail::arg_id_kind::none) { |
| 2570 | auto specs = specs_; |
| 2571 | detail::handle_dynamic_spec<detail::width_checker>(specs.width, |
| 2572 | specs.width_ref, ctx); |
| 2573 | detail::handle_dynamic_spec<detail::precision_checker>( |
| 2574 | specs.precision, specs.precision_ref, ctx); |
| 2575 | return detail::write<Char>(ctx.out(), val, specs, ctx.locale()); |
| 2576 | } |
| 2577 | return detail::write<Char>(ctx.out(), val, specs_, ctx.locale()); |
| 2578 | } |
| 2579 | |
| 2580 | #define FMT_FORMAT_AS(Type, Base) \ |
| 2581 | template <typename Char> \ |
| 2582 | struct formatter<Type, Char> : formatter<Base, Char> { \ |
| 2583 | template <typename FormatContext> \ |
| 2584 | auto format(Type const& val, FormatContext& ctx) const \ |
| 2585 | -> decltype(ctx.out()) { \ |
| 2586 | return formatter<Base, Char>::format(static_cast<Base>(val), ctx); \ |
| 2587 | } \ |
| 2588 | } |
| 2589 | |
| 2590 | FMT_FORMAT_AS(signed char, int); |
| 2591 | FMT_FORMAT_AS(unsigned char, unsigned); |
| 2592 | FMT_FORMAT_AS(short, int); |
| 2593 | FMT_FORMAT_AS(unsigned short, unsigned); |
| 2594 | FMT_FORMAT_AS(long, long long); |
| 2595 | FMT_FORMAT_AS(unsigned long, unsigned long long); |
| 2596 | FMT_FORMAT_AS(Char*, const Char*); |
| 2597 | FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>); |
| 2598 | FMT_FORMAT_AS(std::nullptr_t, const void*); |
| 2599 | FMT_FORMAT_AS(detail::byte, unsigned char); |
| 2600 | FMT_FORMAT_AS(detail::std_string_view<Char>, basic_string_view<Char>); |
| 2601 | |
| 2602 | template <typename Char> |
| 2603 | struct formatter<void*, Char> : formatter<const void*, Char> { |
| 2604 | template <typename FormatContext> |
| 2605 | auto format(void* val, FormatContext& ctx) const -> decltype(ctx.out()) { |
| 2606 | return formatter<const void*, Char>::format(val, ctx); |
| 2607 | } |
| 2608 | }; |
| 2609 | |
| 2610 | template <typename Char, size_t N> |
| 2611 | struct formatter<Char[N], Char> : formatter<basic_string_view<Char>, Char> { |
| 2612 | template <typename FormatContext> |
| 2613 | FMT_CONSTEXPR auto format(const Char* val, FormatContext& ctx) const |
| 2614 | -> decltype(ctx.out()) { |
| 2615 | return formatter<basic_string_view<Char>, Char>::format(val, ctx); |
| 2616 | } |
| 2617 | }; |
| 2618 | |
| 2619 | // A formatter for types known only at run time such as variant alternatives. |
| 2620 | // |
| 2621 | // Usage: |
| 2622 | // using variant = std::variant<int, std::string>; |
| 2623 | // template <> |
| 2624 | // struct formatter<variant>: dynamic_formatter<> { |
| 2625 | // auto format(const variant& v, format_context& ctx) { |
| 2626 | // return visit([&](const auto& val) { |
| 2627 | // return dynamic_formatter<>::format(val, ctx); |
| 2628 | // }, v); |
| 2629 | // } |
| 2630 | // }; |
| 2631 | template <typename Char = char> class dynamic_formatter { |
| 2632 | private: |
| 2633 | detail::dynamic_format_specs<Char> specs_; |
| 2634 | const Char* format_str_; |
| 2635 | |
| 2636 | struct null_handler : detail::error_handler { |
| 2637 | void on_align(align_t) {} |
| 2638 | void on_sign(sign_t) {} |
| 2639 | void on_hash() {} |
| 2640 | }; |
| 2641 | |
| 2642 | template <typename Context> void handle_specs(Context& ctx) { |
| 2643 | detail::handle_dynamic_spec<detail::width_checker>(specs_.width, |
| 2644 | specs_.width_ref, ctx); |
| 2645 | detail::handle_dynamic_spec<detail::precision_checker>( |
| 2646 | specs_.precision, specs_.precision_ref, ctx); |
| 2647 | } |
| 2648 | |
| 2649 | public: |
| 2650 | template <typename ParseContext> |
| 2651 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 2652 | format_str_ = ctx.begin(); |
| 2653 | // Checks are deferred to formatting time when the argument type is known. |
| 2654 | detail::dynamic_specs_handler<ParseContext> handler(specs_, ctx); |
| 2655 | return detail::parse_format_specs(ctx.begin(), ctx.end(), handler); |
| 2656 | } |
| 2657 | |
| 2658 | template <typename T, typename FormatContext> |
| 2659 | auto format(const T& val, FormatContext& ctx) -> decltype(ctx.out()) { |
| 2660 | handle_specs(ctx); |
| 2661 | detail::specs_checker<null_handler> checker( |
| 2662 | null_handler(), detail::mapped_type_constant<T, FormatContext>::value); |
| 2663 | checker.on_align(specs_.align); |
| 2664 | if (specs_.sign != sign::none) checker.on_sign(specs_.sign); |
| 2665 | if (specs_.alt) checker.on_hash(); |
| 2666 | if (specs_.precision >= 0) checker.end_precision(); |
| 2667 | return detail::write<Char>(ctx.out(), val, specs_, ctx.locale()); |
| 2668 | } |
| 2669 | }; |
| 2670 | |
| 2671 | /** |
| 2672 | \rst |
| 2673 | Converts ``p`` to ``const void*`` for pointer formatting. |
| 2674 | |
| 2675 | **Example**:: |
| 2676 | |
| 2677 | auto s = fmt::format("{}", fmt::ptr(p)); |
| 2678 | \endrst |
| 2679 | */ |
| 2680 | template <typename T> auto ptr(T p) -> const void* { |
| 2681 | static_assert(std::is_pointer<T>::value, ""); |
| 2682 | return detail::bit_cast<const void*>(p); |
| 2683 | } |
| 2684 | template <typename T> auto ptr(const std::unique_ptr<T>& p) -> const void* { |
| 2685 | return p.get(); |
| 2686 | } |
| 2687 | template <typename T> auto ptr(const std::shared_ptr<T>& p) -> const void* { |
| 2688 | return p.get(); |
| 2689 | } |
| 2690 | |
| 2691 | class bytes { |
| 2692 | private: |
| 2693 | string_view data_; |
| 2694 | friend struct formatter<bytes>; |
| 2695 | |
| 2696 | public: |
| 2697 | explicit bytes(string_view data) : data_(data) {} |
| 2698 | }; |
| 2699 | |
| 2700 | template <> struct formatter<bytes> { |
| 2701 | private: |
| 2702 | detail::dynamic_format_specs<char> specs_; |
| 2703 | |
| 2704 | public: |
| 2705 | template <typename ParseContext> |
| 2706 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 2707 | using handler_type = detail::dynamic_specs_handler<ParseContext>; |
| 2708 | detail::specs_checker<handler_type> handler(handler_type(specs_, ctx), |
| 2709 | detail::type::string_type); |
| 2710 | auto it = parse_format_specs(ctx.begin(), ctx.end(), handler); |
| 2711 | detail::check_string_type_spec(specs_.type, ctx.error_handler()); |
| 2712 | return it; |
| 2713 | } |
| 2714 | |
| 2715 | template <typename FormatContext> |
| 2716 | auto format(bytes b, FormatContext& ctx) -> decltype(ctx.out()) { |
| 2717 | detail::handle_dynamic_spec<detail::width_checker>(specs_.width, |
| 2718 | specs_.width_ref, ctx); |
| 2719 | detail::handle_dynamic_spec<detail::precision_checker>( |
| 2720 | specs_.precision, specs_.precision_ref, ctx); |
| 2721 | return detail::write_bytes(ctx.out(), b.data_, specs_); |
| 2722 | } |
| 2723 | }; |
| 2724 | |
| 2725 | // group_digits_view is not derived from view because it copies the argument. |
| 2726 | template <typename T> struct group_digits_view { T value; }; |
| 2727 | |
| 2728 | /** |
| 2729 | \rst |
| 2730 | Returns a view that formats an integer value using ',' as a locale-independent |
| 2731 | thousands separator. |
| 2732 | |
| 2733 | **Example**:: |
| 2734 | |
| 2735 | fmt::print("{}", fmt::group_digits(12345)); |
| 2736 | // Output: "12,345" |
| 2737 | \endrst |
| 2738 | */ |
| 2739 | template <typename T> auto group_digits(T value) -> group_digits_view<T> { |
| 2740 | return {value}; |
| 2741 | } |
| 2742 | |
| 2743 | template <typename T> struct formatter<group_digits_view<T>> : formatter<T> { |
| 2744 | private: |
| 2745 | detail::dynamic_format_specs<char> specs_; |
| 2746 | |
| 2747 | public: |
| 2748 | template <typename ParseContext> |
| 2749 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 2750 | using handler_type = detail::dynamic_specs_handler<ParseContext>; |
| 2751 | detail::specs_checker<handler_type> handler(handler_type(specs_, ctx), |
| 2752 | detail::type::int_type); |
| 2753 | auto it = parse_format_specs(ctx.begin(), ctx.end(), handler); |
| 2754 | detail::check_string_type_spec(specs_.type, ctx.error_handler()); |
| 2755 | return it; |
| 2756 | } |
| 2757 | |
| 2758 | template <typename FormatContext> |
| 2759 | auto format(group_digits_view<T> t, FormatContext& ctx) |
| 2760 | -> decltype(ctx.out()) { |
| 2761 | detail::handle_dynamic_spec<detail::width_checker>(specs_.width, |
| 2762 | specs_.width_ref, ctx); |
| 2763 | detail::handle_dynamic_spec<detail::precision_checker>( |
| 2764 | specs_.precision, specs_.precision_ref, ctx); |
| 2765 | return detail::write_int_localized( |
| 2766 | ctx.out(), static_cast<detail::uint64_or_128_t<T>>(t.value), 0, specs_, |
| 2767 | detail::digit_grouping<char>({"\3", ','})); |
| 2768 | } |
| 2769 | }; |
| 2770 | |
| 2771 | template <typename It, typename Sentinel, typename Char = char> |
| 2772 | struct join_view : detail::view { |
| 2773 | It begin; |
| 2774 | Sentinel end; |
| 2775 | basic_string_view<Char> sep; |
| 2776 | |
| 2777 | join_view(It b, Sentinel e, basic_string_view<Char> s) |
| 2778 | : begin(b), end(e), sep(s) {} |
| 2779 | }; |
| 2780 | |
| 2781 | template <typename It, typename Sentinel, typename Char> |
| 2782 | using arg_join FMT_DEPRECATED_ALIAS = join_view<It, Sentinel, Char>; |
| 2783 | |
| 2784 | template <typename It, typename Sentinel, typename Char> |
| 2785 | struct formatter<join_view<It, Sentinel, Char>, Char> { |
| 2786 | private: |
| 2787 | using value_type = |
| 2788 | #ifdef __cpp_lib_ranges |
| 2789 | std::iter_value_t<It>; |
| 2790 | #else |
| 2791 | typename std::iterator_traits<It>::value_type; |
| 2792 | #endif |
| 2793 | using context = buffer_context<Char>; |
| 2794 | using mapper = detail::arg_mapper<context>; |
| 2795 | |
| 2796 | template <typename T, FMT_ENABLE_IF(has_formatter<T, context>::value)> |
| 2797 | static auto map(const T& value) -> const T& { |
| 2798 | return value; |
| 2799 | } |
| 2800 | template <typename T, FMT_ENABLE_IF(!has_formatter<T, context>::value)> |
| 2801 | static auto map(const T& value) -> decltype(mapper().map(value)) { |
| 2802 | return mapper().map(value); |
| 2803 | } |
| 2804 | |
| 2805 | using formatter_type = |
| 2806 | conditional_t<is_formattable<value_type, Char>::value, |
| 2807 | formatter<remove_cvref_t<decltype(map( |
| 2808 | std::declval<const value_type&>()))>, |
| 2809 | Char>, |
| 2810 | detail::fallback_formatter<value_type, Char>>; |
| 2811 | |
| 2812 | formatter_type value_formatter_; |
| 2813 | |
| 2814 | public: |
| 2815 | template <typename ParseContext> |
| 2816 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| 2817 | return value_formatter_.parse(ctx); |
| 2818 | } |
| 2819 | |
| 2820 | template <typename FormatContext> |
| 2821 | auto format(const join_view<It, Sentinel, Char>& value, FormatContext& ctx) |
| 2822 | -> decltype(ctx.out()) { |
| 2823 | auto it = value.begin; |
| 2824 | auto out = ctx.out(); |
| 2825 | if (it != value.end) { |
| 2826 | out = value_formatter_.format(map(*it), ctx); |
| 2827 | ++it; |
| 2828 | while (it != value.end) { |
| 2829 | out = detail::copy_str<Char>(value.sep.begin(), value.sep.end(), out); |
| 2830 | ctx.advance_to(out); |
| 2831 | out = value_formatter_.format(map(*it), ctx); |
| 2832 | ++it; |
| 2833 | } |
| 2834 | } |
| 2835 | return out; |
| 2836 | } |
| 2837 | }; |
| 2838 | |
| 2839 | /** |
| 2840 | Returns a view that formats the iterator range `[begin, end)` with elements |
| 2841 | separated by `sep`. |
| 2842 | */ |
| 2843 | template <typename It, typename Sentinel> |
| 2844 | auto join(It begin, Sentinel end, string_view sep) -> join_view<It, Sentinel> { |
| 2845 | return {begin, end, sep}; |
| 2846 | } |
| 2847 | |
| 2848 | /** |
| 2849 | \rst |
| 2850 | Returns a view that formats `range` with elements separated by `sep`. |
| 2851 | |
| 2852 | **Example**:: |
| 2853 | |
| 2854 | std::vector<int> v = {1, 2, 3}; |
| 2855 | fmt::print("{}", fmt::join(v, ", ")); |
| 2856 | // Output: "1, 2, 3" |
| 2857 | |
| 2858 | ``fmt::join`` applies passed format specifiers to the range elements:: |
| 2859 | |
| 2860 | fmt::print("{:02}", fmt::join(v, ", ")); |
| 2861 | // Output: "01, 02, 03" |
| 2862 | \endrst |
| 2863 | */ |
| 2864 | template <typename Range> |
| 2865 | auto join(Range&& range, string_view sep) |
| 2866 | -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>> { |
| 2867 | return join(std::begin(range), std::end(range), sep); |
| 2868 | } |
| 2869 | |
| 2870 | /** |
| 2871 | \rst |
| 2872 | Converts *value* to ``std::string`` using the default format for type *T*. |
| 2873 | |
| 2874 | **Example**:: |
| 2875 | |
| 2876 | #include <fmt/format.h> |
| 2877 | |
| 2878 | std::string answer = fmt::to_string(42); |
| 2879 | \endrst |
| 2880 | */ |
| 2881 | template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 2882 | inline auto to_string(const T& value) -> std::string { |
| 2883 | auto result = std::string(); |
| 2884 | detail::write<char>(std::back_inserter(result), value); |
| 2885 | return result; |
| 2886 | } |
| 2887 | |
| 2888 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 2889 | FMT_NODISCARD inline auto to_string(T value) -> std::string { |
| 2890 | // The buffer should be large enough to store the number including the sign |
| 2891 | // or "false" for bool. |
| 2892 | constexpr int max_size = detail::digits10<T>() + 2; |
| 2893 | char buffer[max_size > 5 ? static_cast<unsigned>(max_size) : 5]; |
| 2894 | char* begin = buffer; |
| 2895 | return std::string(begin, detail::write<char>(begin, value)); |
| 2896 | } |
| 2897 | |
| 2898 | template <typename Char, size_t SIZE> |
| 2899 | FMT_NODISCARD auto to_string(const basic_memory_buffer<Char, SIZE>& buf) |
| 2900 | -> std::basic_string<Char> { |
| 2901 | auto size = buf.size(); |
| 2902 | detail::assume(size < std::basic_string<Char>().max_size()); |
| 2903 | return std::basic_string<Char>(buf.data(), size); |
| 2904 | } |
| 2905 | |
| 2906 | FMT_BEGIN_DETAIL_NAMESPACE |
| 2907 | |
| 2908 | template <typename Char> |
| 2909 | void vformat_to( |
| 2910 | buffer<Char>& buf, basic_string_view<Char> fmt, |
| 2911 | basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args, |
| 2912 | locale_ref loc) { |
| 2913 | // workaround for msvc bug regarding name-lookup in module |
| 2914 | // link names into function scope |
| 2915 | using detail::arg_formatter; |
| 2916 | using detail::buffer_appender; |
| 2917 | using detail::custom_formatter; |
| 2918 | using detail::default_arg_formatter; |
| 2919 | using detail::get_arg; |
| 2920 | using detail::locale_ref; |
| 2921 | using detail::parse_format_specs; |
| 2922 | using detail::specs_checker; |
| 2923 | using detail::specs_handler; |
| 2924 | using detail::to_unsigned; |
| 2925 | using detail::type; |
| 2926 | using detail::write; |
| 2927 | auto out = buffer_appender<Char>(buf); |
| 2928 | if (fmt.size() == 2 && equal2(fmt.data(), "{}")) { |
| 2929 | auto arg = args.get(0); |
| 2930 | if (!arg) error_handler().on_error("argument not found"); |
| 2931 | visit_format_arg(default_arg_formatter<Char>{out, args, loc}, arg); |
| 2932 | return; |
| 2933 | } |
| 2934 | |
| 2935 | struct format_handler : error_handler { |
| 2936 | basic_format_parse_context<Char> parse_context; |
| 2937 | buffer_context<Char> context; |
| 2938 | |
| 2939 | format_handler(buffer_appender<Char> out, basic_string_view<Char> str, |
| 2940 | basic_format_args<buffer_context<Char>> args, locale_ref loc) |
| 2941 | : parse_context(str), context(out, args, loc) {} |
| 2942 | |
| 2943 | void on_text(const Char* begin, const Char* end) { |
| 2944 | auto text = basic_string_view<Char>(begin, to_unsigned(end - begin)); |
| 2945 | context.advance_to(write<Char>(context.out(), text)); |
| 2946 | } |
| 2947 | |
| 2948 | FMT_CONSTEXPR auto on_arg_id() -> int { |
| 2949 | return parse_context.next_arg_id(); |
| 2950 | } |
| 2951 | FMT_CONSTEXPR auto on_arg_id(int id) -> int { |
| 2952 | return parse_context.check_arg_id(id), id; |
| 2953 | } |
| 2954 | FMT_CONSTEXPR auto on_arg_id(basic_string_view<Char> id) -> int { |
| 2955 | int arg_id = context.arg_id(id); |
| 2956 | if (arg_id < 0) on_error("argument not found"); |
| 2957 | return arg_id; |
| 2958 | } |
| 2959 | |
| 2960 | FMT_INLINE void on_replacement_field(int id, const Char*) { |
| 2961 | auto arg = get_arg(context, id); |
| 2962 | context.advance_to(visit_format_arg( |
| 2963 | default_arg_formatter<Char>{context.out(), context.args(), |
| 2964 | context.locale()}, |
| 2965 | arg)); |
| 2966 | } |
| 2967 | |
| 2968 | auto on_format_specs(int id, const Char* begin, const Char* end) |
| 2969 | -> const Char* { |
| 2970 | auto arg = get_arg(context, id); |
| 2971 | if (arg.type() == type::custom_type) { |
| 2972 | parse_context.advance_to(parse_context.begin() + |
| 2973 | (begin - &*parse_context.begin())); |
| 2974 | visit_format_arg(custom_formatter<Char>{parse_context, context}, arg); |
| 2975 | return parse_context.begin(); |
| 2976 | } |
| 2977 | auto specs = basic_format_specs<Char>(); |
| 2978 | specs_checker<specs_handler<Char>> handler( |
| 2979 | specs_handler<Char>(specs, parse_context, context), arg.type()); |
| 2980 | begin = parse_format_specs(begin, end, handler); |
| 2981 | if (begin == end || *begin != '}') |
| 2982 | on_error("missing '}' in format string"); |
| 2983 | auto f = arg_formatter<Char>{context.out(), specs, context.locale()}; |
| 2984 | context.advance_to(visit_format_arg(f, arg)); |
| 2985 | return begin; |
| 2986 | } |
| 2987 | }; |
| 2988 | detail::parse_format_string<false>(fmt, format_handler(out, fmt, args, loc)); |
| 2989 | } |
| 2990 | |
| 2991 | #ifndef FMT_HEADER_ONLY |
| 2992 | extern template FMT_API auto thousands_sep_impl<char>(locale_ref) |
| 2993 | -> thousands_sep_result<char>; |
| 2994 | extern template FMT_API auto thousands_sep_impl<wchar_t>(locale_ref) |
| 2995 | -> thousands_sep_result<wchar_t>; |
| 2996 | extern template FMT_API auto decimal_point_impl(locale_ref) -> char; |
| 2997 | extern template FMT_API auto decimal_point_impl(locale_ref) -> wchar_t; |
| 2998 | extern template auto format_float<double>(double value, int precision, |
| 2999 | float_specs specs, buffer<char>& buf) |
| 3000 | -> int; |
| 3001 | extern template auto format_float<long double>(long double value, int precision, |
| 3002 | float_specs specs, |
| 3003 | buffer<char>& buf) -> int; |
| 3004 | void snprintf_float(float, int, float_specs, buffer<char>&) = delete; |
| 3005 | extern template auto snprintf_float<double>(double value, int precision, |
| 3006 | float_specs specs, |
| 3007 | buffer<char>& buf) -> int; |
| 3008 | extern template auto snprintf_float<long double>(long double value, |
| 3009 | int precision, |
| 3010 | float_specs specs, |
| 3011 | buffer<char>& buf) -> int; |
| 3012 | #endif // FMT_HEADER_ONLY |
| 3013 | |
| 3014 | FMT_END_DETAIL_NAMESPACE |
| 3015 | |
| 3016 | #if FMT_USE_USER_DEFINED_LITERALS |
| 3017 | inline namespace literals { |
| 3018 | /** |
| 3019 | \rst |
| 3020 | User-defined literal equivalent of :func:`fmt::arg`. |
| 3021 | |
| 3022 | **Example**:: |
| 3023 | |
| 3024 | using namespace fmt::literals; |
| 3025 | fmt::print("Elapsed time: {s:.2f} seconds", "s"_a=1.23); |
| 3026 | \endrst |
| 3027 | */ |
| 3028 | # if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS |
| 3029 | template <detail_exported::fixed_string Str> |
| 3030 | constexpr auto operator""_a() |
| 3031 | -> detail::udl_arg<remove_cvref_t<decltype(Str.data[0])>, |
| 3032 | sizeof(Str.data) / sizeof(decltype(Str.data[0])), Str> { |
| 3033 | return {}; |
| 3034 | } |
| 3035 | # else |
| 3036 | constexpr auto operator"" _a(const char* s, size_t) -> detail::udl_arg<char> { |
| 3037 | return {s}; |
| 3038 | } |
| 3039 | # endif |
| 3040 | |
| 3041 | // DEPRECATED! |
| 3042 | // User-defined literal equivalent of fmt::format. |
| 3043 | FMT_DEPRECATED constexpr auto operator"" _format(const char* s, size_t n) |
| 3044 | -> detail::udl_formatter<char> { |
| 3045 | return {{s, n}}; |
| 3046 | } |
| 3047 | } // namespace literals |
| 3048 | #endif // FMT_USE_USER_DEFINED_LITERALS |
| 3049 | |
| 3050 | template <typename Locale, FMT_ENABLE_IF(detail::is_locale<Locale>::value)> |
| 3051 | inline auto vformat(const Locale& loc, string_view fmt, format_args args) |
| 3052 | -> std::string { |
| 3053 | return detail::vformat(loc, fmt, args); |
| 3054 | } |
| 3055 | |
| 3056 | template <typename Locale, typename... T, |
| 3057 | FMT_ENABLE_IF(detail::is_locale<Locale>::value)> |
| 3058 | inline auto format(const Locale& loc, format_string<T...> fmt, T&&... args) |
| 3059 | -> std::string { |
| 3060 | return vformat(loc, string_view(fmt), fmt::make_format_args(args...)); |
| 3061 | } |
| 3062 | |
| 3063 | template <typename... T, size_t SIZE, typename Allocator> |
| 3064 | FMT_DEPRECATED auto format_to(basic_memory_buffer<char, SIZE, Allocator>& buf, |
| 3065 | format_string<T...> fmt, T&&... args) |
| 3066 | -> appender { |
| 3067 | detail::vformat_to(buf, string_view(fmt), fmt::make_format_args(args...)); |
| 3068 | return appender(buf); |
| 3069 | } |
| 3070 | |
| 3071 | template <typename OutputIt, typename Locale, |
| 3072 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&& |
| 3073 | detail::is_locale<Locale>::value)> |
| 3074 | auto vformat_to(OutputIt out, const Locale& loc, string_view fmt, |
| 3075 | format_args args) -> OutputIt { |
| 3076 | using detail::get_buffer; |
| 3077 | auto&& buf = get_buffer<char>(out); |
| 3078 | detail::vformat_to(buf, fmt, args, detail::locale_ref(loc)); |
| 3079 | return detail::get_iterator(buf); |
| 3080 | } |
| 3081 | |
| 3082 | template <typename OutputIt, typename Locale, typename... T, |
| 3083 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&& |
| 3084 | detail::is_locale<Locale>::value)> |
| 3085 | FMT_INLINE auto format_to(OutputIt out, const Locale& loc, |
| 3086 | format_string<T...> fmt, T&&... args) -> OutputIt { |
| 3087 | return vformat_to(out, loc, fmt, fmt::make_format_args(args...)); |
| 3088 | } |
| 3089 | |
| 3090 | FMT_MODULE_EXPORT_END |
| 3091 | FMT_END_NAMESPACE |
| 3092 | |
| 3093 | #ifdef FMT_DEPRECATED_INCLUDE_XCHAR |
| 3094 | # include "xchar.h" |
| 3095 | #endif |
| 3096 | |
| 3097 | #ifdef FMT_HEADER_ONLY |
| 3098 | # define FMT_FUNC inline |
| 3099 | # include "format-inl.h" |
| 3100 | #else |
| 3101 | # define FMT_FUNC |
| 3102 | #endif |
| 3103 | |
| 3104 | #endif // FMT_FORMAT_H_ |