1 | // Formatting library for C++ - the core API for char/UTF-8 |
2 | // |
3 | // Copyright (c) 2012 - present, Victor Zverovich |
4 | // All rights reserved. |
5 | // |
6 | // For the license information refer to format.h. |
7 | |
8 | #ifndef FMT_CORE_H_ |
9 | #define FMT_CORE_H_ |
10 | |
11 | #include <cstddef> // std::byte |
12 | #include <cstdio> // std::FILE |
13 | #include <cstring> // std::strlen |
14 | #include <iterator> |
15 | #include <limits> |
16 | #include <string> |
17 | #include <type_traits> |
18 | |
19 | // The fmt library version in the form major * 10000 + minor * 100 + patch. |
20 | #define FMT_VERSION 90100 |
21 | |
22 | #if defined(__clang__) && !defined(__ibmxl__) |
23 | # define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__) |
24 | #else |
25 | # define FMT_CLANG_VERSION 0 |
26 | #endif |
27 | |
28 | #if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && \ |
29 | !defined(__NVCOMPILER) |
30 | # define FMT_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) |
31 | #else |
32 | # define FMT_GCC_VERSION 0 |
33 | #endif |
34 | |
35 | #ifndef FMT_GCC_PRAGMA |
36 | // Workaround _Pragma bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59884. |
37 | # if FMT_GCC_VERSION >= 504 |
38 | # define FMT_GCC_PRAGMA(arg) _Pragma(arg) |
39 | # else |
40 | # define FMT_GCC_PRAGMA(arg) |
41 | # endif |
42 | #endif |
43 | |
44 | #ifdef __ICL |
45 | # define FMT_ICC_VERSION __ICL |
46 | #elif defined(__INTEL_COMPILER) |
47 | # define FMT_ICC_VERSION __INTEL_COMPILER |
48 | #else |
49 | # define FMT_ICC_VERSION 0 |
50 | #endif |
51 | |
52 | #ifdef _MSC_VER |
53 | # define FMT_MSC_VERSION _MSC_VER |
54 | # define FMT_MSC_WARNING(...) __pragma(warning(__VA_ARGS__)) |
55 | #else |
56 | # define FMT_MSC_VERSION 0 |
57 | # define FMT_MSC_WARNING(...) |
58 | #endif |
59 | |
60 | #ifdef _MSVC_LANG |
61 | # define FMT_CPLUSPLUS _MSVC_LANG |
62 | #else |
63 | # define FMT_CPLUSPLUS __cplusplus |
64 | #endif |
65 | |
66 | #ifdef __has_feature |
67 | # define FMT_HAS_FEATURE(x) __has_feature(x) |
68 | #else |
69 | # define FMT_HAS_FEATURE(x) 0 |
70 | #endif |
71 | |
72 | #if (defined(__has_include) || FMT_ICC_VERSION >= 1600 || \ |
73 | FMT_MSC_VERSION > 1900) && \ |
74 | !defined(__INTELLISENSE__) |
75 | # define FMT_HAS_INCLUDE(x) __has_include(x) |
76 | #else |
77 | # define FMT_HAS_INCLUDE(x) 0 |
78 | #endif |
79 | |
80 | #ifdef __has_cpp_attribute |
81 | # define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) |
82 | #else |
83 | # define FMT_HAS_CPP_ATTRIBUTE(x) 0 |
84 | #endif |
85 | |
86 | #define FMT_HAS_CPP14_ATTRIBUTE(attribute) \ |
87 | (FMT_CPLUSPLUS >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute)) |
88 | |
89 | #define FMT_HAS_CPP17_ATTRIBUTE(attribute) \ |
90 | (FMT_CPLUSPLUS >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute)) |
91 | |
92 | // Check if relaxed C++14 constexpr is supported. |
93 | // GCC doesn't allow throw in constexpr until version 6 (bug 67371). |
94 | #ifndef FMT_USE_CONSTEXPR |
95 | # if (FMT_HAS_FEATURE(cxx_relaxed_constexpr) || FMT_MSC_VERSION >= 1912 || \ |
96 | (FMT_GCC_VERSION >= 600 && FMT_CPLUSPLUS >= 201402L)) && \ |
97 | !FMT_ICC_VERSION && !defined(__NVCC__) |
98 | # define FMT_USE_CONSTEXPR 1 |
99 | # else |
100 | # define FMT_USE_CONSTEXPR 0 |
101 | # endif |
102 | #endif |
103 | #if FMT_USE_CONSTEXPR |
104 | # define FMT_CONSTEXPR constexpr |
105 | #else |
106 | # define FMT_CONSTEXPR |
107 | #endif |
108 | |
109 | #if ((FMT_CPLUSPLUS >= 202002L) && \ |
110 | (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9)) || \ |
111 | (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002) |
112 | # define FMT_CONSTEXPR20 constexpr |
113 | #else |
114 | # define FMT_CONSTEXPR20 |
115 | #endif |
116 | |
117 | // Check if constexpr std::char_traits<>::{compare,length} are supported. |
118 | #if defined(__GLIBCXX__) |
119 | # if FMT_CPLUSPLUS >= 201703L && defined(_GLIBCXX_RELEASE) && \ |
120 | _GLIBCXX_RELEASE >= 7 // GCC 7+ libstdc++ has _GLIBCXX_RELEASE. |
121 | # define FMT_CONSTEXPR_CHAR_TRAITS constexpr |
122 | # endif |
123 | #elif defined(_LIBCPP_VERSION) && FMT_CPLUSPLUS >= 201703L && \ |
124 | _LIBCPP_VERSION >= 4000 |
125 | # define FMT_CONSTEXPR_CHAR_TRAITS constexpr |
126 | #elif FMT_MSC_VERSION >= 1914 && FMT_CPLUSPLUS >= 201703L |
127 | # define FMT_CONSTEXPR_CHAR_TRAITS constexpr |
128 | #endif |
129 | #ifndef FMT_CONSTEXPR_CHAR_TRAITS |
130 | # define FMT_CONSTEXPR_CHAR_TRAITS |
131 | #endif |
132 | |
133 | // Check if exceptions are disabled. |
134 | #ifndef FMT_EXCEPTIONS |
135 | # if (defined(__GNUC__) && !defined(__EXCEPTIONS)) || \ |
136 | (FMT_MSC_VERSION && !_HAS_EXCEPTIONS) |
137 | # define FMT_EXCEPTIONS 0 |
138 | # else |
139 | # define FMT_EXCEPTIONS 1 |
140 | # endif |
141 | #endif |
142 | |
143 | #ifndef FMT_DEPRECATED |
144 | # if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VERSION >= 1900 |
145 | # define FMT_DEPRECATED [[deprecated]] |
146 | # else |
147 | # if (defined(__GNUC__) && !defined(__LCC__)) || defined(__clang__) |
148 | # define FMT_DEPRECATED __attribute__((deprecated)) |
149 | # elif FMT_MSC_VERSION |
150 | # define FMT_DEPRECATED __declspec(deprecated) |
151 | # else |
152 | # define FMT_DEPRECATED /* deprecated */ |
153 | # endif |
154 | # endif |
155 | #endif |
156 | |
157 | // [[noreturn]] is disabled on MSVC and NVCC because of bogus unreachable code |
158 | // warnings. |
159 | #if FMT_EXCEPTIONS && FMT_HAS_CPP_ATTRIBUTE(noreturn) && !FMT_MSC_VERSION && \ |
160 | !defined(__NVCC__) |
161 | # define FMT_NORETURN [[noreturn]] |
162 | #else |
163 | # define FMT_NORETURN |
164 | #endif |
165 | |
166 | #if FMT_HAS_CPP17_ATTRIBUTE(fallthrough) |
167 | # define FMT_FALLTHROUGH [[fallthrough]] |
168 | #elif defined(__clang__) |
169 | # define FMT_FALLTHROUGH [[clang::fallthrough]] |
170 | #elif FMT_GCC_VERSION >= 700 && \ |
171 | (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= 520) |
172 | # define FMT_FALLTHROUGH [[gnu::fallthrough]] |
173 | #else |
174 | # define FMT_FALLTHROUGH |
175 | #endif |
176 | |
177 | #ifndef FMT_NODISCARD |
178 | # if FMT_HAS_CPP17_ATTRIBUTE(nodiscard) |
179 | # define FMT_NODISCARD [[nodiscard]] |
180 | # else |
181 | # define FMT_NODISCARD |
182 | # endif |
183 | #endif |
184 | |
185 | #ifndef FMT_USE_FLOAT |
186 | # define FMT_USE_FLOAT 1 |
187 | #endif |
188 | #ifndef FMT_USE_DOUBLE |
189 | # define FMT_USE_DOUBLE 1 |
190 | #endif |
191 | #ifndef FMT_USE_LONG_DOUBLE |
192 | # define FMT_USE_LONG_DOUBLE 1 |
193 | #endif |
194 | |
195 | #ifndef FMT_INLINE |
196 | # if FMT_GCC_VERSION || FMT_CLANG_VERSION |
197 | # define FMT_INLINE inline __attribute__((always_inline)) |
198 | # else |
199 | # define FMT_INLINE inline |
200 | # endif |
201 | #endif |
202 | |
203 | // An inline std::forward replacement. |
204 | #define FMT_FORWARD(...) static_cast<decltype(__VA_ARGS__)&&>(__VA_ARGS__) |
205 | |
206 | #ifdef _MSC_VER |
207 | # define FMT_UNCHECKED_ITERATOR(It) \ |
208 | using _Unchecked_type = It // Mark iterator as checked. |
209 | #else |
210 | # define FMT_UNCHECKED_ITERATOR(It) using unchecked_type = It |
211 | #endif |
212 | |
213 | #ifndef FMT_BEGIN_NAMESPACE |
214 | # define FMT_BEGIN_NAMESPACE \ |
215 | namespace fmt { \ |
216 | inline namespace v9 { |
217 | # define FMT_END_NAMESPACE \ |
218 | } \ |
219 | } |
220 | #endif |
221 | |
222 | #ifndef FMT_MODULE_EXPORT |
223 | # define FMT_MODULE_EXPORT |
224 | # define FMT_MODULE_EXPORT_BEGIN |
225 | # define FMT_MODULE_EXPORT_END |
226 | # define FMT_BEGIN_DETAIL_NAMESPACE namespace detail { |
227 | # define FMT_END_DETAIL_NAMESPACE } |
228 | #endif |
229 | |
230 | #if !defined(FMT_HEADER_ONLY) && defined(_WIN32) |
231 | # define FMT_CLASS_API FMT_MSC_WARNING(suppress : 4275) |
232 | # ifdef FMT_EXPORT |
233 | # define FMT_API __declspec(dllexport) |
234 | # elif defined(FMT_SHARED) |
235 | # define FMT_API __declspec(dllimport) |
236 | # endif |
237 | #else |
238 | # define FMT_CLASS_API |
239 | # if defined(FMT_EXPORT) || defined(FMT_SHARED) |
240 | # if defined(__GNUC__) || defined(__clang__) |
241 | # define FMT_API __attribute__((visibility("default"))) |
242 | # endif |
243 | # endif |
244 | #endif |
245 | #ifndef FMT_API |
246 | # define FMT_API |
247 | #endif |
248 | |
249 | // libc++ supports string_view in pre-c++17. |
250 | #if FMT_HAS_INCLUDE(<string_view>) && \ |
251 | (FMT_CPLUSPLUS >= 201703L || defined(_LIBCPP_VERSION)) |
252 | # include <string_view> |
253 | # define FMT_USE_STRING_VIEW |
254 | #elif FMT_HAS_INCLUDE("experimental/string_view") && FMT_CPLUSPLUS >= 201402L |
255 | # include <experimental/string_view> |
256 | # define FMT_USE_EXPERIMENTAL_STRING_VIEW |
257 | #endif |
258 | |
259 | #ifndef FMT_UNICODE |
260 | # define FMT_UNICODE !FMT_MSC_VERSION |
261 | #endif |
262 | |
263 | #ifndef FMT_CONSTEVAL |
264 | # if ((FMT_GCC_VERSION >= 1000 || FMT_CLANG_VERSION >= 1101) && \ |
265 | FMT_CPLUSPLUS >= 202002L && !defined(__apple_build_version__)) || \ |
266 | (defined(__cpp_consteval) && \ |
267 | (!FMT_MSC_VERSION || _MSC_FULL_VER >= 193030704)) |
268 | // consteval is broken in MSVC before VS2022 and Apple clang 13. |
269 | # define FMT_CONSTEVAL consteval |
270 | # define FMT_HAS_CONSTEVAL |
271 | # else |
272 | # define FMT_CONSTEVAL |
273 | # endif |
274 | #endif |
275 | |
276 | #ifndef FMT_USE_NONTYPE_TEMPLATE_ARGS |
277 | # if defined(__cpp_nontype_template_args) && \ |
278 | ((FMT_GCC_VERSION >= 903 && FMT_CPLUSPLUS >= 201709L) || \ |
279 | __cpp_nontype_template_args >= 201911L) && \ |
280 | !defined(__NVCOMPILER) |
281 | # define FMT_USE_NONTYPE_TEMPLATE_ARGS 1 |
282 | # else |
283 | # define FMT_USE_NONTYPE_TEMPLATE_ARGS 0 |
284 | # endif |
285 | #endif |
286 | |
287 | // Enable minimal optimizations for more compact code in debug mode. |
288 | FMT_GCC_PRAGMA("GCC push_options" ) |
289 | #if !defined(__OPTIMIZE__) && !defined(__NVCOMPILER) |
290 | FMT_GCC_PRAGMA("GCC optimize(\"Og\")" ) |
291 | #endif |
292 | |
293 | FMT_BEGIN_NAMESPACE |
294 | FMT_MODULE_EXPORT_BEGIN |
295 | |
296 | // Implementations of enable_if_t and other metafunctions for older systems. |
297 | template <bool B, typename T = void> |
298 | using enable_if_t = typename std::enable_if<B, T>::type; |
299 | template <bool B, typename T, typename F> |
300 | using conditional_t = typename std::conditional<B, T, F>::type; |
301 | template <bool B> using bool_constant = std::integral_constant<bool, B>; |
302 | template <typename T> |
303 | using remove_reference_t = typename std::remove_reference<T>::type; |
304 | template <typename T> |
305 | using remove_const_t = typename std::remove_const<T>::type; |
306 | template <typename T> |
307 | using remove_cvref_t = typename std::remove_cv<remove_reference_t<T>>::type; |
308 | template <typename T> struct type_identity { using type = T; }; |
309 | template <typename T> using type_identity_t = typename type_identity<T>::type; |
310 | template <typename T> |
311 | using underlying_t = typename std::underlying_type<T>::type; |
312 | |
313 | template <typename...> struct disjunction : std::false_type {}; |
314 | template <typename P> struct disjunction<P> : P {}; |
315 | template <typename P1, typename... Pn> |
316 | struct disjunction<P1, Pn...> |
317 | : conditional_t<bool(P1::value), P1, disjunction<Pn...>> {}; |
318 | |
319 | template <typename...> struct conjunction : std::true_type {}; |
320 | template <typename P> struct conjunction<P> : P {}; |
321 | template <typename P1, typename... Pn> |
322 | struct conjunction<P1, Pn...> |
323 | : conditional_t<bool(P1::value), conjunction<Pn...>, P1> {}; |
324 | |
325 | struct monostate { |
326 | constexpr monostate() {} |
327 | }; |
328 | |
329 | // An enable_if helper to be used in template parameters which results in much |
330 | // shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed |
331 | // to workaround a bug in MSVC 2019 (see #1140 and #1186). |
332 | #ifdef FMT_DOC |
333 | # define FMT_ENABLE_IF(...) |
334 | #else |
335 | # define FMT_ENABLE_IF(...) enable_if_t<(__VA_ARGS__), int> = 0 |
336 | #endif |
337 | |
338 | FMT_BEGIN_DETAIL_NAMESPACE |
339 | |
340 | // Suppresses "unused variable" warnings with the method described in |
341 | // https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/. |
342 | // (void)var does not work on many Intel compilers. |
343 | template <typename... T> FMT_CONSTEXPR void ignore_unused(const T&...) {} |
344 | |
345 | constexpr FMT_INLINE auto is_constant_evaluated( |
346 | bool default_value = false) noexcept -> bool { |
347 | #ifdef __cpp_lib_is_constant_evaluated |
348 | ignore_unused(default_value); |
349 | return std::is_constant_evaluated(); |
350 | #else |
351 | return default_value; |
352 | #endif |
353 | } |
354 | |
355 | // Suppresses "conditional expression is constant" warnings. |
356 | template <typename T> constexpr FMT_INLINE auto const_check(T value) -> T { |
357 | return value; |
358 | } |
359 | |
360 | FMT_NORETURN FMT_API void assert_fail(const char* file, int line, |
361 | const char* message); |
362 | |
363 | #ifndef FMT_ASSERT |
364 | # ifdef NDEBUG |
365 | // FMT_ASSERT is not empty to avoid -Wempty-body. |
366 | # define FMT_ASSERT(condition, message) \ |
367 | ::fmt::detail::ignore_unused((condition), (message)) |
368 | # else |
369 | # define FMT_ASSERT(condition, message) \ |
370 | ((condition) /* void() fails with -Winvalid-constexpr on clang 4.0.1 */ \ |
371 | ? (void)0 \ |
372 | : ::fmt::detail::assert_fail(__FILE__, __LINE__, (message))) |
373 | # endif |
374 | #endif |
375 | |
376 | #if defined(FMT_USE_STRING_VIEW) |
377 | template <typename Char> using std_string_view = std::basic_string_view<Char>; |
378 | #elif defined(FMT_USE_EXPERIMENTAL_STRING_VIEW) |
379 | template <typename Char> |
380 | using std_string_view = std::experimental::basic_string_view<Char>; |
381 | #else |
382 | template <typename T> struct std_string_view {}; |
383 | #endif |
384 | |
385 | #ifdef FMT_USE_INT128 |
386 | // Do nothing. |
387 | #elif defined(__SIZEOF_INT128__) && !defined(__NVCC__) && \ |
388 | !(FMT_CLANG_VERSION && FMT_MSC_VERSION) |
389 | # define FMT_USE_INT128 1 |
390 | using int128_opt = __int128_t; // An optional native 128-bit integer. |
391 | using uint128_opt = __uint128_t; |
392 | template <typename T> inline auto convert_for_visit(T value) -> T { |
393 | return value; |
394 | } |
395 | #else |
396 | # define FMT_USE_INT128 0 |
397 | #endif |
398 | #if !FMT_USE_INT128 |
399 | enum class int128_opt {}; |
400 | enum class uint128_opt {}; |
401 | // Reduce template instantiations. |
402 | template <typename T> auto convert_for_visit(T) -> monostate { return {}; } |
403 | #endif |
404 | |
405 | // Casts a nonnegative integer to unsigned. |
406 | template <typename Int> |
407 | FMT_CONSTEXPR auto to_unsigned(Int value) -> |
408 | typename std::make_unsigned<Int>::type { |
409 | FMT_ASSERT(std::is_unsigned<Int>::value || value >= 0, "negative value" ); |
410 | return static_cast<typename std::make_unsigned<Int>::type>(value); |
411 | } |
412 | |
413 | FMT_MSC_WARNING(suppress : 4566) constexpr unsigned char micro[] = "\u00B5" ; |
414 | |
415 | constexpr auto is_utf8() -> bool { |
416 | // Avoid buggy sign extensions in MSVC's constant evaluation mode (#2297). |
417 | using uchar = unsigned char; |
418 | return FMT_UNICODE || (sizeof(micro) == 3 && uchar(micro[0]) == 0xC2 && |
419 | uchar(micro[1]) == 0xB5); |
420 | } |
421 | FMT_END_DETAIL_NAMESPACE |
422 | |
423 | /** |
424 | An implementation of ``std::basic_string_view`` for pre-C++17. It provides a |
425 | subset of the API. ``fmt::basic_string_view`` is used for format strings even |
426 | if ``std::string_view`` is available to prevent issues when a library is |
427 | compiled with a different ``-std`` option than the client code (which is not |
428 | recommended). |
429 | */ |
430 | template <typename Char> class basic_string_view { |
431 | private: |
432 | const Char* data_; |
433 | size_t size_; |
434 | |
435 | public: |
436 | using value_type = Char; |
437 | using iterator = const Char*; |
438 | |
439 | constexpr basic_string_view() noexcept : data_(nullptr), size_(0) {} |
440 | |
441 | /** Constructs a string reference object from a C string and a size. */ |
442 | constexpr basic_string_view(const Char* s, size_t count) noexcept |
443 | : data_(s), size_(count) {} |
444 | |
445 | /** |
446 | \rst |
447 | Constructs a string reference object from a C string computing |
448 | the size with ``std::char_traits<Char>::length``. |
449 | \endrst |
450 | */ |
451 | FMT_CONSTEXPR_CHAR_TRAITS |
452 | FMT_INLINE |
453 | basic_string_view(const Char* s) |
454 | : data_(s), |
455 | size_(detail::const_check(std::is_same<Char, char>::value && |
456 | !detail::is_constant_evaluated(true)) |
457 | ? std::strlen(reinterpret_cast<const char*>(s)) |
458 | : std::char_traits<Char>::length(s)) {} |
459 | |
460 | /** Constructs a string reference from a ``std::basic_string`` object. */ |
461 | template <typename Traits, typename Alloc> |
462 | FMT_CONSTEXPR basic_string_view( |
463 | const std::basic_string<Char, Traits, Alloc>& s) noexcept |
464 | : data_(s.data()), size_(s.size()) {} |
465 | |
466 | template <typename S, FMT_ENABLE_IF(std::is_same< |
467 | S, detail::std_string_view<Char>>::value)> |
468 | FMT_CONSTEXPR basic_string_view(S s) noexcept |
469 | : data_(s.data()), size_(s.size()) {} |
470 | |
471 | /** Returns a pointer to the string data. */ |
472 | constexpr auto data() const noexcept -> const Char* { return data_; } |
473 | |
474 | /** Returns the string size. */ |
475 | constexpr auto size() const noexcept -> size_t { return size_; } |
476 | |
477 | constexpr auto begin() const noexcept -> iterator { return data_; } |
478 | constexpr auto end() const noexcept -> iterator { return data_ + size_; } |
479 | |
480 | constexpr auto operator[](size_t pos) const noexcept -> const Char& { |
481 | return data_[pos]; |
482 | } |
483 | |
484 | FMT_CONSTEXPR void remove_prefix(size_t n) noexcept { |
485 | data_ += n; |
486 | size_ -= n; |
487 | } |
488 | |
489 | // Lexicographically compare this string reference to other. |
490 | FMT_CONSTEXPR_CHAR_TRAITS auto compare(basic_string_view other) const -> int { |
491 | size_t str_size = size_ < other.size_ ? size_ : other.size_; |
492 | int result = std::char_traits<Char>::compare(data_, other.data_, str_size); |
493 | if (result == 0) |
494 | result = size_ == other.size_ ? 0 : (size_ < other.size_ ? -1 : 1); |
495 | return result; |
496 | } |
497 | |
498 | FMT_CONSTEXPR_CHAR_TRAITS friend auto operator==(basic_string_view lhs, |
499 | basic_string_view rhs) |
500 | -> bool { |
501 | return lhs.compare(rhs) == 0; |
502 | } |
503 | friend auto operator!=(basic_string_view lhs, basic_string_view rhs) -> bool { |
504 | return lhs.compare(rhs) != 0; |
505 | } |
506 | friend auto operator<(basic_string_view lhs, basic_string_view rhs) -> bool { |
507 | return lhs.compare(rhs) < 0; |
508 | } |
509 | friend auto operator<=(basic_string_view lhs, basic_string_view rhs) -> bool { |
510 | return lhs.compare(rhs) <= 0; |
511 | } |
512 | friend auto operator>(basic_string_view lhs, basic_string_view rhs) -> bool { |
513 | return lhs.compare(rhs) > 0; |
514 | } |
515 | friend auto operator>=(basic_string_view lhs, basic_string_view rhs) -> bool { |
516 | return lhs.compare(rhs) >= 0; |
517 | } |
518 | }; |
519 | |
520 | using string_view = basic_string_view<char>; |
521 | |
522 | /** Specifies if ``T`` is a character type. Can be specialized by users. */ |
523 | template <typename T> struct is_char : std::false_type {}; |
524 | template <> struct is_char<char> : std::true_type {}; |
525 | |
526 | FMT_BEGIN_DETAIL_NAMESPACE |
527 | |
528 | // A base class for compile-time strings. |
529 | struct compile_string {}; |
530 | |
531 | template <typename S> |
532 | struct is_compile_string : std::is_base_of<compile_string, S> {}; |
533 | |
534 | // Returns a string view of `s`. |
535 | template <typename Char, FMT_ENABLE_IF(is_char<Char>::value)> |
536 | FMT_INLINE auto to_string_view(const Char* s) -> basic_string_view<Char> { |
537 | return s; |
538 | } |
539 | template <typename Char, typename Traits, typename Alloc> |
540 | inline auto to_string_view(const std::basic_string<Char, Traits, Alloc>& s) |
541 | -> basic_string_view<Char> { |
542 | return s; |
543 | } |
544 | template <typename Char> |
545 | constexpr auto to_string_view(basic_string_view<Char> s) |
546 | -> basic_string_view<Char> { |
547 | return s; |
548 | } |
549 | template <typename Char, |
550 | FMT_ENABLE_IF(!std::is_empty<std_string_view<Char>>::value)> |
551 | inline auto to_string_view(std_string_view<Char> s) -> basic_string_view<Char> { |
552 | return s; |
553 | } |
554 | template <typename S, FMT_ENABLE_IF(is_compile_string<S>::value)> |
555 | constexpr auto to_string_view(const S& s) |
556 | -> basic_string_view<typename S::char_type> { |
557 | return basic_string_view<typename S::char_type>(s); |
558 | } |
559 | void to_string_view(...); |
560 | |
561 | // Specifies whether S is a string type convertible to fmt::basic_string_view. |
562 | // It should be a constexpr function but MSVC 2017 fails to compile it in |
563 | // enable_if and MSVC 2015 fails to compile it as an alias template. |
564 | // ADL invocation of to_string_view is DEPRECATED! |
565 | template <typename S> |
566 | struct is_string : std::is_class<decltype(to_string_view(std::declval<S>()))> { |
567 | }; |
568 | |
569 | template <typename S, typename = void> struct char_t_impl {}; |
570 | template <typename S> struct char_t_impl<S, enable_if_t<is_string<S>::value>> { |
571 | using result = decltype(to_string_view(std::declval<S>())); |
572 | using type = typename result::value_type; |
573 | }; |
574 | |
575 | enum class type { |
576 | none_type, |
577 | // Integer types should go first, |
578 | int_type, |
579 | uint_type, |
580 | long_long_type, |
581 | ulong_long_type, |
582 | int128_type, |
583 | uint128_type, |
584 | bool_type, |
585 | char_type, |
586 | last_integer_type = char_type, |
587 | // followed by floating-point types. |
588 | float_type, |
589 | double_type, |
590 | long_double_type, |
591 | last_numeric_type = long_double_type, |
592 | cstring_type, |
593 | string_type, |
594 | pointer_type, |
595 | custom_type |
596 | }; |
597 | |
598 | // Maps core type T to the corresponding type enum constant. |
599 | template <typename T, typename Char> |
600 | struct type_constant : std::integral_constant<type, type::custom_type> {}; |
601 | |
602 | #define FMT_TYPE_CONSTANT(Type, constant) \ |
603 | template <typename Char> \ |
604 | struct type_constant<Type, Char> \ |
605 | : std::integral_constant<type, type::constant> {} |
606 | |
607 | FMT_TYPE_CONSTANT(int, int_type); |
608 | FMT_TYPE_CONSTANT(unsigned, uint_type); |
609 | FMT_TYPE_CONSTANT(long long, long_long_type); |
610 | FMT_TYPE_CONSTANT(unsigned long long, ulong_long_type); |
611 | FMT_TYPE_CONSTANT(int128_opt, int128_type); |
612 | FMT_TYPE_CONSTANT(uint128_opt, uint128_type); |
613 | FMT_TYPE_CONSTANT(bool, bool_type); |
614 | FMT_TYPE_CONSTANT(Char, char_type); |
615 | FMT_TYPE_CONSTANT(float, float_type); |
616 | FMT_TYPE_CONSTANT(double, double_type); |
617 | FMT_TYPE_CONSTANT(long double, long_double_type); |
618 | FMT_TYPE_CONSTANT(const Char*, cstring_type); |
619 | FMT_TYPE_CONSTANT(basic_string_view<Char>, string_type); |
620 | FMT_TYPE_CONSTANT(const void*, pointer_type); |
621 | |
622 | constexpr bool is_integral_type(type t) { |
623 | return t > type::none_type && t <= type::last_integer_type; |
624 | } |
625 | |
626 | constexpr bool is_arithmetic_type(type t) { |
627 | return t > type::none_type && t <= type::last_numeric_type; |
628 | } |
629 | |
630 | FMT_NORETURN FMT_API void throw_format_error(const char* message); |
631 | |
632 | struct error_handler { |
633 | constexpr error_handler() = default; |
634 | constexpr error_handler(const error_handler&) = default; |
635 | |
636 | // This function is intentionally not constexpr to give a compile-time error. |
637 | FMT_NORETURN void on_error(const char* message) { |
638 | throw_format_error(message); |
639 | } |
640 | }; |
641 | FMT_END_DETAIL_NAMESPACE |
642 | |
643 | /** String's character type. */ |
644 | template <typename S> using char_t = typename detail::char_t_impl<S>::type; |
645 | |
646 | /** |
647 | \rst |
648 | Parsing context consisting of a format string range being parsed and an |
649 | argument counter for automatic indexing. |
650 | You can use the ``format_parse_context`` type alias for ``char`` instead. |
651 | \endrst |
652 | */ |
653 | template <typename Char, typename ErrorHandler = detail::error_handler> |
654 | class basic_format_parse_context : private ErrorHandler { |
655 | private: |
656 | basic_string_view<Char> format_str_; |
657 | int next_arg_id_; |
658 | |
659 | FMT_CONSTEXPR void do_check_arg_id(int id); |
660 | |
661 | public: |
662 | using char_type = Char; |
663 | using iterator = typename basic_string_view<Char>::iterator; |
664 | |
665 | explicit constexpr basic_format_parse_context( |
666 | basic_string_view<Char> format_str, ErrorHandler eh = {}, |
667 | int next_arg_id = 0) |
668 | : ErrorHandler(eh), format_str_(format_str), next_arg_id_(next_arg_id) {} |
669 | |
670 | /** |
671 | Returns an iterator to the beginning of the format string range being |
672 | parsed. |
673 | */ |
674 | constexpr auto begin() const noexcept -> iterator { |
675 | return format_str_.begin(); |
676 | } |
677 | |
678 | /** |
679 | Returns an iterator past the end of the format string range being parsed. |
680 | */ |
681 | constexpr auto end() const noexcept -> iterator { return format_str_.end(); } |
682 | |
683 | /** Advances the begin iterator to ``it``. */ |
684 | FMT_CONSTEXPR void advance_to(iterator it) { |
685 | format_str_.remove_prefix(detail::to_unsigned(it - begin())); |
686 | } |
687 | |
688 | /** |
689 | Reports an error if using the manual argument indexing; otherwise returns |
690 | the next argument index and switches to the automatic indexing. |
691 | */ |
692 | FMT_CONSTEXPR auto next_arg_id() -> int { |
693 | if (next_arg_id_ < 0) { |
694 | on_error("cannot switch from manual to automatic argument indexing" ); |
695 | return 0; |
696 | } |
697 | int id = next_arg_id_++; |
698 | do_check_arg_id(id); |
699 | return id; |
700 | } |
701 | |
702 | /** |
703 | Reports an error if using the automatic argument indexing; otherwise |
704 | switches to the manual indexing. |
705 | */ |
706 | FMT_CONSTEXPR void check_arg_id(int id) { |
707 | if (next_arg_id_ > 0) { |
708 | on_error("cannot switch from automatic to manual argument indexing" ); |
709 | return; |
710 | } |
711 | next_arg_id_ = -1; |
712 | do_check_arg_id(id); |
713 | } |
714 | FMT_CONSTEXPR void check_arg_id(basic_string_view<Char>) {} |
715 | FMT_CONSTEXPR void check_dynamic_spec(int arg_id); |
716 | |
717 | FMT_CONSTEXPR void on_error(const char* message) { |
718 | ErrorHandler::on_error(message); |
719 | } |
720 | |
721 | constexpr auto error_handler() const -> ErrorHandler { return *this; } |
722 | }; |
723 | |
724 | using format_parse_context = basic_format_parse_context<char>; |
725 | |
726 | FMT_BEGIN_DETAIL_NAMESPACE |
727 | // A parse context with extra data used only in compile-time checks. |
728 | template <typename Char, typename ErrorHandler = detail::error_handler> |
729 | class compile_parse_context |
730 | : public basic_format_parse_context<Char, ErrorHandler> { |
731 | private: |
732 | int num_args_; |
733 | const type* types_; |
734 | using base = basic_format_parse_context<Char, ErrorHandler>; |
735 | |
736 | public: |
737 | explicit FMT_CONSTEXPR compile_parse_context( |
738 | basic_string_view<Char> format_str, int num_args, const type* types, |
739 | ErrorHandler eh = {}, int next_arg_id = 0) |
740 | : base(format_str, eh, next_arg_id), num_args_(num_args), types_(types) {} |
741 | |
742 | constexpr auto num_args() const -> int { return num_args_; } |
743 | constexpr auto arg_type(int id) const -> type { return types_[id]; } |
744 | |
745 | FMT_CONSTEXPR auto next_arg_id() -> int { |
746 | int id = base::next_arg_id(); |
747 | if (id >= num_args_) this->on_error("argument not found" ); |
748 | return id; |
749 | } |
750 | |
751 | FMT_CONSTEXPR void check_arg_id(int id) { |
752 | base::check_arg_id(id); |
753 | if (id >= num_args_) this->on_error("argument not found" ); |
754 | } |
755 | using base::check_arg_id; |
756 | |
757 | FMT_CONSTEXPR void check_dynamic_spec(int arg_id) { |
758 | if (arg_id < num_args_ && types_ && !is_integral_type(types_[arg_id])) |
759 | this->on_error("width/precision is not integer" ); |
760 | } |
761 | }; |
762 | FMT_END_DETAIL_NAMESPACE |
763 | |
764 | template <typename Char, typename ErrorHandler> |
765 | FMT_CONSTEXPR void |
766 | basic_format_parse_context<Char, ErrorHandler>::do_check_arg_id(int id) { |
767 | // Argument id is only checked at compile-time during parsing because |
768 | // formatting has its own validation. |
769 | if (detail::is_constant_evaluated() && FMT_GCC_VERSION >= 1200) { |
770 | using context = detail::compile_parse_context<Char, ErrorHandler>; |
771 | if (id >= static_cast<context*>(this)->num_args()) |
772 | on_error("argument not found" ); |
773 | } |
774 | } |
775 | |
776 | template <typename Char, typename ErrorHandler> |
777 | FMT_CONSTEXPR void |
778 | basic_format_parse_context<Char, ErrorHandler>::check_dynamic_spec(int arg_id) { |
779 | if (detail::is_constant_evaluated()) { |
780 | using context = detail::compile_parse_context<Char, ErrorHandler>; |
781 | static_cast<context*>(this)->check_dynamic_spec(arg_id); |
782 | } |
783 | } |
784 | |
785 | template <typename Context> class basic_format_arg; |
786 | template <typename Context> class basic_format_args; |
787 | template <typename Context> class dynamic_format_arg_store; |
788 | |
789 | // A formatter for objects of type T. |
790 | template <typename T, typename Char = char, typename Enable = void> |
791 | struct formatter { |
792 | // A deleted default constructor indicates a disabled formatter. |
793 | formatter() = delete; |
794 | }; |
795 | |
796 | // Specifies if T has an enabled formatter specialization. A type can be |
797 | // formattable even if it doesn't have a formatter e.g. via a conversion. |
798 | template <typename T, typename Context> |
799 | using has_formatter = |
800 | std::is_constructible<typename Context::template formatter_type<T>>; |
801 | |
802 | // Checks whether T is a container with contiguous storage. |
803 | template <typename T> struct is_contiguous : std::false_type {}; |
804 | template <typename Char> |
805 | struct is_contiguous<std::basic_string<Char>> : std::true_type {}; |
806 | |
807 | class appender; |
808 | |
809 | FMT_BEGIN_DETAIL_NAMESPACE |
810 | |
811 | template <typename Context, typename T> |
812 | constexpr auto has_const_formatter_impl(T*) |
813 | -> decltype(typename Context::template formatter_type<T>().format( |
814 | std::declval<const T&>(), std::declval<Context&>()), |
815 | true) { |
816 | return true; |
817 | } |
818 | template <typename Context> |
819 | constexpr auto has_const_formatter_impl(...) -> bool { |
820 | return false; |
821 | } |
822 | template <typename T, typename Context> |
823 | constexpr auto has_const_formatter() -> bool { |
824 | return has_const_formatter_impl<Context>(static_cast<T*>(nullptr)); |
825 | } |
826 | |
827 | // Extracts a reference to the container from back_insert_iterator. |
828 | template <typename Container> |
829 | inline auto get_container(std::back_insert_iterator<Container> it) |
830 | -> Container& { |
831 | using base = std::back_insert_iterator<Container>; |
832 | struct accessor : base { |
833 | accessor(base b) : base(b) {} |
834 | using base::container; |
835 | }; |
836 | return *accessor(it).container; |
837 | } |
838 | |
839 | template <typename Char, typename InputIt, typename OutputIt> |
840 | FMT_CONSTEXPR auto copy_str(InputIt begin, InputIt end, OutputIt out) |
841 | -> OutputIt { |
842 | while (begin != end) *out++ = static_cast<Char>(*begin++); |
843 | return out; |
844 | } |
845 | |
846 | template <typename Char, typename T, typename U, |
847 | FMT_ENABLE_IF( |
848 | std::is_same<remove_const_t<T>, U>::value&& is_char<U>::value)> |
849 | FMT_CONSTEXPR auto copy_str(T* begin, T* end, U* out) -> U* { |
850 | if (is_constant_evaluated()) return copy_str<Char, T*, U*>(begin, end, out); |
851 | auto size = to_unsigned(end - begin); |
852 | memcpy(out, begin, size * sizeof(U)); |
853 | return out + size; |
854 | } |
855 | |
856 | /** |
857 | \rst |
858 | A contiguous memory buffer with an optional growing ability. It is an internal |
859 | class and shouldn't be used directly, only via `~fmt::basic_memory_buffer`. |
860 | \endrst |
861 | */ |
862 | template <typename T> class buffer { |
863 | private: |
864 | T* ptr_; |
865 | size_t size_; |
866 | size_t capacity_; |
867 | |
868 | protected: |
869 | // Don't initialize ptr_ since it is not accessed to save a few cycles. |
870 | FMT_MSC_WARNING(suppress : 26495) |
871 | buffer(size_t sz) noexcept : size_(sz), capacity_(sz) {} |
872 | |
873 | FMT_CONSTEXPR20 buffer(T* p = nullptr, size_t sz = 0, size_t cap = 0) noexcept |
874 | : ptr_(p), size_(sz), capacity_(cap) {} |
875 | |
876 | FMT_CONSTEXPR20 ~buffer() = default; |
877 | buffer(buffer&&) = default; |
878 | |
879 | /** Sets the buffer data and capacity. */ |
880 | FMT_CONSTEXPR void set(T* buf_data, size_t buf_capacity) noexcept { |
881 | ptr_ = buf_data; |
882 | capacity_ = buf_capacity; |
883 | } |
884 | |
885 | /** Increases the buffer capacity to hold at least *capacity* elements. */ |
886 | virtual FMT_CONSTEXPR20 void grow(size_t capacity) = 0; |
887 | |
888 | public: |
889 | using value_type = T; |
890 | using const_reference = const T&; |
891 | |
892 | buffer(const buffer&) = delete; |
893 | void operator=(const buffer&) = delete; |
894 | |
895 | auto begin() noexcept -> T* { return ptr_; } |
896 | auto end() noexcept -> T* { return ptr_ + size_; } |
897 | |
898 | auto begin() const noexcept -> const T* { return ptr_; } |
899 | auto end() const noexcept -> const T* { return ptr_ + size_; } |
900 | |
901 | /** Returns the size of this buffer. */ |
902 | constexpr auto size() const noexcept -> size_t { return size_; } |
903 | |
904 | /** Returns the capacity of this buffer. */ |
905 | constexpr auto capacity() const noexcept -> size_t { return capacity_; } |
906 | |
907 | /** Returns a pointer to the buffer data. */ |
908 | FMT_CONSTEXPR auto data() noexcept -> T* { return ptr_; } |
909 | |
910 | /** Returns a pointer to the buffer data. */ |
911 | FMT_CONSTEXPR auto data() const noexcept -> const T* { return ptr_; } |
912 | |
913 | /** Clears this buffer. */ |
914 | void clear() { size_ = 0; } |
915 | |
916 | // Tries resizing the buffer to contain *count* elements. If T is a POD type |
917 | // the new elements may not be initialized. |
918 | FMT_CONSTEXPR20 void try_resize(size_t count) { |
919 | try_reserve(count); |
920 | size_ = count <= capacity_ ? count : capacity_; |
921 | } |
922 | |
923 | // Tries increasing the buffer capacity to *new_capacity*. It can increase the |
924 | // capacity by a smaller amount than requested but guarantees there is space |
925 | // for at least one additional element either by increasing the capacity or by |
926 | // flushing the buffer if it is full. |
927 | FMT_CONSTEXPR20 void try_reserve(size_t new_capacity) { |
928 | if (new_capacity > capacity_) grow(new_capacity); |
929 | } |
930 | |
931 | FMT_CONSTEXPR20 void push_back(const T& value) { |
932 | try_reserve(size_ + 1); |
933 | ptr_[size_++] = value; |
934 | } |
935 | |
936 | /** Appends data to the end of the buffer. */ |
937 | template <typename U> void append(const U* begin, const U* end); |
938 | |
939 | template <typename Idx> FMT_CONSTEXPR auto operator[](Idx index) -> T& { |
940 | return ptr_[index]; |
941 | } |
942 | template <typename Idx> |
943 | FMT_CONSTEXPR auto operator[](Idx index) const -> const T& { |
944 | return ptr_[index]; |
945 | } |
946 | }; |
947 | |
948 | struct buffer_traits { |
949 | explicit buffer_traits(size_t) {} |
950 | auto count() const -> size_t { return 0; } |
951 | auto limit(size_t size) -> size_t { return size; } |
952 | }; |
953 | |
954 | class fixed_buffer_traits { |
955 | private: |
956 | size_t count_ = 0; |
957 | size_t limit_; |
958 | |
959 | public: |
960 | explicit fixed_buffer_traits(size_t limit) : limit_(limit) {} |
961 | auto count() const -> size_t { return count_; } |
962 | auto limit(size_t size) -> size_t { |
963 | size_t n = limit_ > count_ ? limit_ - count_ : 0; |
964 | count_ += size; |
965 | return size < n ? size : n; |
966 | } |
967 | }; |
968 | |
969 | // A buffer that writes to an output iterator when flushed. |
970 | template <typename OutputIt, typename T, typename Traits = buffer_traits> |
971 | class iterator_buffer final : public Traits, public buffer<T> { |
972 | private: |
973 | OutputIt out_; |
974 | enum { buffer_size = 256 }; |
975 | T data_[buffer_size]; |
976 | |
977 | protected: |
978 | FMT_CONSTEXPR20 void grow(size_t) override { |
979 | if (this->size() == buffer_size) flush(); |
980 | } |
981 | |
982 | void flush() { |
983 | auto size = this->size(); |
984 | this->clear(); |
985 | out_ = copy_str<T>(data_, data_ + this->limit(size), out_); |
986 | } |
987 | |
988 | public: |
989 | explicit iterator_buffer(OutputIt out, size_t n = buffer_size) |
990 | : Traits(n), buffer<T>(data_, 0, buffer_size), out_(out) {} |
991 | iterator_buffer(iterator_buffer&& other) |
992 | : Traits(other), buffer<T>(data_, 0, buffer_size), out_(other.out_) {} |
993 | ~iterator_buffer() { flush(); } |
994 | |
995 | auto out() -> OutputIt { |
996 | flush(); |
997 | return out_; |
998 | } |
999 | auto count() const -> size_t { return Traits::count() + this->size(); } |
1000 | }; |
1001 | |
1002 | template <typename T> |
1003 | class iterator_buffer<T*, T, fixed_buffer_traits> final |
1004 | : public fixed_buffer_traits, |
1005 | public buffer<T> { |
1006 | private: |
1007 | T* out_; |
1008 | enum { buffer_size = 256 }; |
1009 | T data_[buffer_size]; |
1010 | |
1011 | protected: |
1012 | FMT_CONSTEXPR20 void grow(size_t) override { |
1013 | if (this->size() == this->capacity()) flush(); |
1014 | } |
1015 | |
1016 | void flush() { |
1017 | size_t n = this->limit(this->size()); |
1018 | if (this->data() == out_) { |
1019 | out_ += n; |
1020 | this->set(data_, buffer_size); |
1021 | } |
1022 | this->clear(); |
1023 | } |
1024 | |
1025 | public: |
1026 | explicit iterator_buffer(T* out, size_t n = buffer_size) |
1027 | : fixed_buffer_traits(n), buffer<T>(out, 0, n), out_(out) {} |
1028 | iterator_buffer(iterator_buffer&& other) |
1029 | : fixed_buffer_traits(other), |
1030 | buffer<T>(std::move(other)), |
1031 | out_(other.out_) { |
1032 | if (this->data() != out_) { |
1033 | this->set(data_, buffer_size); |
1034 | this->clear(); |
1035 | } |
1036 | } |
1037 | ~iterator_buffer() { flush(); } |
1038 | |
1039 | auto out() -> T* { |
1040 | flush(); |
1041 | return out_; |
1042 | } |
1043 | auto count() const -> size_t { |
1044 | return fixed_buffer_traits::count() + this->size(); |
1045 | } |
1046 | }; |
1047 | |
1048 | template <typename T> class iterator_buffer<T*, T> final : public buffer<T> { |
1049 | protected: |
1050 | FMT_CONSTEXPR20 void grow(size_t) override {} |
1051 | |
1052 | public: |
1053 | explicit iterator_buffer(T* out, size_t = 0) : buffer<T>(out, 0, ~size_t()) {} |
1054 | |
1055 | auto out() -> T* { return &*this->end(); } |
1056 | }; |
1057 | |
1058 | // A buffer that writes to a container with the contiguous storage. |
1059 | template <typename Container> |
1060 | class iterator_buffer<std::back_insert_iterator<Container>, |
1061 | enable_if_t<is_contiguous<Container>::value, |
1062 | typename Container::value_type>> |
1063 | final : public buffer<typename Container::value_type> { |
1064 | private: |
1065 | Container& container_; |
1066 | |
1067 | protected: |
1068 | FMT_CONSTEXPR20 void grow(size_t capacity) override { |
1069 | container_.resize(capacity); |
1070 | this->set(&container_[0], capacity); |
1071 | } |
1072 | |
1073 | public: |
1074 | explicit iterator_buffer(Container& c) |
1075 | : buffer<typename Container::value_type>(c.size()), container_(c) {} |
1076 | explicit iterator_buffer(std::back_insert_iterator<Container> out, size_t = 0) |
1077 | : iterator_buffer(get_container(out)) {} |
1078 | |
1079 | auto out() -> std::back_insert_iterator<Container> { |
1080 | return std::back_inserter(container_); |
1081 | } |
1082 | }; |
1083 | |
1084 | // A buffer that counts the number of code units written discarding the output. |
1085 | template <typename T = char> class counting_buffer final : public buffer<T> { |
1086 | private: |
1087 | enum { buffer_size = 256 }; |
1088 | T data_[buffer_size]; |
1089 | size_t count_ = 0; |
1090 | |
1091 | protected: |
1092 | FMT_CONSTEXPR20 void grow(size_t) override { |
1093 | if (this->size() != buffer_size) return; |
1094 | count_ += this->size(); |
1095 | this->clear(); |
1096 | } |
1097 | |
1098 | public: |
1099 | counting_buffer() : buffer<T>(data_, 0, buffer_size) {} |
1100 | |
1101 | auto count() -> size_t { return count_ + this->size(); } |
1102 | }; |
1103 | |
1104 | template <typename T> |
1105 | using buffer_appender = conditional_t<std::is_same<T, char>::value, appender, |
1106 | std::back_insert_iterator<buffer<T>>>; |
1107 | |
1108 | // Maps an output iterator to a buffer. |
1109 | template <typename T, typename OutputIt> |
1110 | auto get_buffer(OutputIt out) -> iterator_buffer<OutputIt, T> { |
1111 | return iterator_buffer<OutputIt, T>(out); |
1112 | } |
1113 | |
1114 | template <typename Buffer> |
1115 | auto get_iterator(Buffer& buf) -> decltype(buf.out()) { |
1116 | return buf.out(); |
1117 | } |
1118 | template <typename T> auto get_iterator(buffer<T>& buf) -> buffer_appender<T> { |
1119 | return buffer_appender<T>(buf); |
1120 | } |
1121 | |
1122 | template <typename T, typename Char = char, typename Enable = void> |
1123 | struct fallback_formatter { |
1124 | fallback_formatter() = delete; |
1125 | }; |
1126 | |
1127 | // Specifies if T has an enabled fallback_formatter specialization. |
1128 | template <typename T, typename Char> |
1129 | using has_fallback_formatter = |
1130 | #ifdef FMT_DEPRECATED_OSTREAM |
1131 | std::is_constructible<fallback_formatter<T, Char>>; |
1132 | #else |
1133 | std::false_type; |
1134 | #endif |
1135 | |
1136 | struct view {}; |
1137 | |
1138 | template <typename Char, typename T> struct named_arg : view { |
1139 | const Char* name; |
1140 | const T& value; |
1141 | named_arg(const Char* n, const T& v) : name(n), value(v) {} |
1142 | }; |
1143 | |
1144 | template <typename Char> struct named_arg_info { |
1145 | const Char* name; |
1146 | int id; |
1147 | }; |
1148 | |
1149 | template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS> |
1150 | struct arg_data { |
1151 | // args_[0].named_args points to named_args_ to avoid bloating format_args. |
1152 | // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning. |
1153 | T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : +1)]; |
1154 | named_arg_info<Char> named_args_[NUM_NAMED_ARGS]; |
1155 | |
1156 | template <typename... U> |
1157 | arg_data(const U&... init) : args_{T(named_args_, NUM_NAMED_ARGS), init...} {} |
1158 | arg_data(const arg_data& other) = delete; |
1159 | auto args() const -> const T* { return args_ + 1; } |
1160 | auto named_args() -> named_arg_info<Char>* { return named_args_; } |
1161 | }; |
1162 | |
1163 | template <typename T, typename Char, size_t NUM_ARGS> |
1164 | struct arg_data<T, Char, NUM_ARGS, 0> { |
1165 | // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning. |
1166 | T args_[NUM_ARGS != 0 ? NUM_ARGS : +1]; |
1167 | |
1168 | template <typename... U> |
1169 | FMT_CONSTEXPR FMT_INLINE arg_data(const U&... init) : args_{init...} {} |
1170 | FMT_CONSTEXPR FMT_INLINE auto args() const -> const T* { return args_; } |
1171 | FMT_CONSTEXPR FMT_INLINE auto named_args() -> std::nullptr_t { |
1172 | return nullptr; |
1173 | } |
1174 | }; |
1175 | |
1176 | template <typename Char> |
1177 | inline void init_named_args(named_arg_info<Char>*, int, int) {} |
1178 | |
1179 | template <typename T> struct is_named_arg : std::false_type {}; |
1180 | template <typename T> struct is_statically_named_arg : std::false_type {}; |
1181 | |
1182 | template <typename T, typename Char> |
1183 | struct is_named_arg<named_arg<Char, T>> : std::true_type {}; |
1184 | |
1185 | template <typename Char, typename T, typename... Tail, |
1186 | FMT_ENABLE_IF(!is_named_arg<T>::value)> |
1187 | void init_named_args(named_arg_info<Char>* named_args, int arg_count, |
1188 | int named_arg_count, const T&, const Tail&... args) { |
1189 | init_named_args(named_args, arg_count + 1, named_arg_count, args...); |
1190 | } |
1191 | |
1192 | template <typename Char, typename T, typename... Tail, |
1193 | FMT_ENABLE_IF(is_named_arg<T>::value)> |
1194 | void init_named_args(named_arg_info<Char>* named_args, int arg_count, |
1195 | int named_arg_count, const T& arg, const Tail&... args) { |
1196 | named_args[named_arg_count++] = {arg.name, arg_count}; |
1197 | init_named_args(named_args, arg_count + 1, named_arg_count, args...); |
1198 | } |
1199 | |
1200 | template <typename... Args> |
1201 | FMT_CONSTEXPR FMT_INLINE void init_named_args(std::nullptr_t, int, int, |
1202 | const Args&...) {} |
1203 | |
1204 | template <bool B = false> constexpr auto count() -> size_t { return B ? 1 : 0; } |
1205 | template <bool B1, bool B2, bool... Tail> constexpr auto count() -> size_t { |
1206 | return (B1 ? 1 : 0) + count<B2, Tail...>(); |
1207 | } |
1208 | |
1209 | template <typename... Args> constexpr auto count_named_args() -> size_t { |
1210 | return count<is_named_arg<Args>::value...>(); |
1211 | } |
1212 | |
1213 | template <typename... Args> |
1214 | constexpr auto count_statically_named_args() -> size_t { |
1215 | return count<is_statically_named_arg<Args>::value...>(); |
1216 | } |
1217 | |
1218 | struct unformattable {}; |
1219 | struct unformattable_char : unformattable {}; |
1220 | struct unformattable_const : unformattable {}; |
1221 | struct unformattable_pointer : unformattable {}; |
1222 | |
1223 | template <typename Char> struct string_value { |
1224 | const Char* data; |
1225 | size_t size; |
1226 | }; |
1227 | |
1228 | template <typename Char> struct named_arg_value { |
1229 | const named_arg_info<Char>* data; |
1230 | size_t size; |
1231 | }; |
1232 | |
1233 | template <typename Context> struct custom_value { |
1234 | using parse_context = typename Context::parse_context_type; |
1235 | void* value; |
1236 | void (*format)(void* arg, parse_context& parse_ctx, Context& ctx); |
1237 | }; |
1238 | |
1239 | // A formatting argument value. |
1240 | template <typename Context> class value { |
1241 | public: |
1242 | using char_type = typename Context::char_type; |
1243 | |
1244 | union { |
1245 | monostate no_value; |
1246 | int int_value; |
1247 | unsigned uint_value; |
1248 | long long long_long_value; |
1249 | unsigned long long ulong_long_value; |
1250 | int128_opt int128_value; |
1251 | uint128_opt uint128_value; |
1252 | bool bool_value; |
1253 | char_type char_value; |
1254 | float float_value; |
1255 | double double_value; |
1256 | long double long_double_value; |
1257 | const void* pointer; |
1258 | string_value<char_type> string; |
1259 | custom_value<Context> custom; |
1260 | named_arg_value<char_type> named_args; |
1261 | }; |
1262 | |
1263 | constexpr FMT_INLINE value() : no_value() {} |
1264 | constexpr FMT_INLINE value(int val) : int_value(val) {} |
1265 | constexpr FMT_INLINE value(unsigned val) : uint_value(val) {} |
1266 | constexpr FMT_INLINE value(long long val) : long_long_value(val) {} |
1267 | constexpr FMT_INLINE value(unsigned long long val) : ulong_long_value(val) {} |
1268 | FMT_INLINE value(int128_opt val) : int128_value(val) {} |
1269 | FMT_INLINE value(uint128_opt val) : uint128_value(val) {} |
1270 | constexpr FMT_INLINE value(float val) : float_value(val) {} |
1271 | constexpr FMT_INLINE value(double val) : double_value(val) {} |
1272 | FMT_INLINE value(long double val) : long_double_value(val) {} |
1273 | constexpr FMT_INLINE value(bool val) : bool_value(val) {} |
1274 | constexpr FMT_INLINE value(char_type val) : char_value(val) {} |
1275 | FMT_CONSTEXPR FMT_INLINE value(const char_type* val) { |
1276 | string.data = val; |
1277 | if (is_constant_evaluated()) string.size = {}; |
1278 | } |
1279 | FMT_CONSTEXPR FMT_INLINE value(basic_string_view<char_type> val) { |
1280 | string.data = val.data(); |
1281 | string.size = val.size(); |
1282 | } |
1283 | FMT_INLINE value(const void* val) : pointer(val) {} |
1284 | FMT_INLINE value(const named_arg_info<char_type>* args, size_t size) |
1285 | : named_args{args, size} {} |
1286 | |
1287 | template <typename T> FMT_CONSTEXPR FMT_INLINE value(T& val) { |
1288 | using value_type = remove_cvref_t<T>; |
1289 | custom.value = const_cast<value_type*>(&val); |
1290 | // Get the formatter type through the context to allow different contexts |
1291 | // have different extension points, e.g. `formatter<T>` for `format` and |
1292 | // `printf_formatter<T>` for `printf`. |
1293 | custom.format = format_custom_arg< |
1294 | value_type, |
1295 | conditional_t<has_formatter<value_type, Context>::value, |
1296 | typename Context::template formatter_type<value_type>, |
1297 | fallback_formatter<value_type, char_type>>>; |
1298 | } |
1299 | value(unformattable); |
1300 | value(unformattable_char); |
1301 | value(unformattable_const); |
1302 | value(unformattable_pointer); |
1303 | |
1304 | private: |
1305 | // Formats an argument of a custom type, such as a user-defined class. |
1306 | template <typename T, typename Formatter> |
1307 | static void format_custom_arg(void* arg, |
1308 | typename Context::parse_context_type& parse_ctx, |
1309 | Context& ctx) { |
1310 | auto f = Formatter(); |
1311 | parse_ctx.advance_to(f.parse(parse_ctx)); |
1312 | using qualified_type = |
1313 | conditional_t<has_const_formatter<T, Context>(), const T, T>; |
1314 | ctx.advance_to(f.format(*static_cast<qualified_type*>(arg), ctx)); |
1315 | } |
1316 | }; |
1317 | |
1318 | template <typename Context, typename T> |
1319 | FMT_CONSTEXPR auto make_arg(T&& value) -> basic_format_arg<Context>; |
1320 | |
1321 | // To minimize the number of types we need to deal with, long is translated |
1322 | // either to int or to long long depending on its size. |
1323 | enum { long_short = sizeof(long) == sizeof(int) }; |
1324 | using long_type = conditional_t<long_short, int, long long>; |
1325 | using ulong_type = conditional_t<long_short, unsigned, unsigned long long>; |
1326 | |
1327 | #ifdef __cpp_lib_byte |
1328 | inline auto format_as(std::byte b) -> unsigned char { |
1329 | return static_cast<unsigned char>(b); |
1330 | } |
1331 | #endif |
1332 | |
1333 | template <typename T> struct has_format_as { |
1334 | template <typename U, typename V = decltype(format_as(U())), |
1335 | FMT_ENABLE_IF(std::is_enum<U>::value&& std::is_integral<V>::value)> |
1336 | static auto check(U*) -> std::true_type; |
1337 | static auto check(...) -> std::false_type; |
1338 | |
1339 | enum { value = decltype(check(static_cast<T*>(nullptr)))::value }; |
1340 | }; |
1341 | |
1342 | // Maps formatting arguments to core types. |
1343 | // arg_mapper reports errors by returning unformattable instead of using |
1344 | // static_assert because it's used in the is_formattable trait. |
1345 | template <typename Context> struct arg_mapper { |
1346 | using char_type = typename Context::char_type; |
1347 | |
1348 | FMT_CONSTEXPR FMT_INLINE auto map(signed char val) -> int { return val; } |
1349 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned char val) -> unsigned { |
1350 | return val; |
1351 | } |
1352 | FMT_CONSTEXPR FMT_INLINE auto map(short val) -> int { return val; } |
1353 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned short val) -> unsigned { |
1354 | return val; |
1355 | } |
1356 | FMT_CONSTEXPR FMT_INLINE auto map(int val) -> int { return val; } |
1357 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned val) -> unsigned { return val; } |
1358 | FMT_CONSTEXPR FMT_INLINE auto map(long val) -> long_type { return val; } |
1359 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned long val) -> ulong_type { |
1360 | return val; |
1361 | } |
1362 | FMT_CONSTEXPR FMT_INLINE auto map(long long val) -> long long { return val; } |
1363 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned long long val) |
1364 | -> unsigned long long { |
1365 | return val; |
1366 | } |
1367 | FMT_CONSTEXPR FMT_INLINE auto map(int128_opt val) -> int128_opt { |
1368 | return val; |
1369 | } |
1370 | FMT_CONSTEXPR FMT_INLINE auto map(uint128_opt val) -> uint128_opt { |
1371 | return val; |
1372 | } |
1373 | FMT_CONSTEXPR FMT_INLINE auto map(bool val) -> bool { return val; } |
1374 | |
1375 | template <typename T, FMT_ENABLE_IF(std::is_same<T, char>::value || |
1376 | std::is_same<T, char_type>::value)> |
1377 | FMT_CONSTEXPR FMT_INLINE auto map(T val) -> char_type { |
1378 | return val; |
1379 | } |
1380 | template <typename T, enable_if_t<(std::is_same<T, wchar_t>::value || |
1381 | #ifdef __cpp_char8_t |
1382 | std::is_same<T, char8_t>::value || |
1383 | #endif |
1384 | std::is_same<T, char16_t>::value || |
1385 | std::is_same<T, char32_t>::value) && |
1386 | !std::is_same<T, char_type>::value, |
1387 | int> = 0> |
1388 | FMT_CONSTEXPR FMT_INLINE auto map(T) -> unformattable_char { |
1389 | return {}; |
1390 | } |
1391 | |
1392 | FMT_CONSTEXPR FMT_INLINE auto map(float val) -> float { return val; } |
1393 | FMT_CONSTEXPR FMT_INLINE auto map(double val) -> double { return val; } |
1394 | FMT_CONSTEXPR FMT_INLINE auto map(long double val) -> long double { |
1395 | return val; |
1396 | } |
1397 | |
1398 | FMT_CONSTEXPR FMT_INLINE auto map(char_type* val) -> const char_type* { |
1399 | return val; |
1400 | } |
1401 | FMT_CONSTEXPR FMT_INLINE auto map(const char_type* val) -> const char_type* { |
1402 | return val; |
1403 | } |
1404 | template <typename T, |
1405 | FMT_ENABLE_IF(is_string<T>::value && !std::is_pointer<T>::value && |
1406 | std::is_same<char_type, char_t<T>>::value)> |
1407 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1408 | -> basic_string_view<char_type> { |
1409 | return to_string_view(val); |
1410 | } |
1411 | template <typename T, |
1412 | FMT_ENABLE_IF(is_string<T>::value && !std::is_pointer<T>::value && |
1413 | !std::is_same<char_type, char_t<T>>::value)> |
1414 | FMT_CONSTEXPR FMT_INLINE auto map(const T&) -> unformattable_char { |
1415 | return {}; |
1416 | } |
1417 | template <typename T, |
1418 | FMT_ENABLE_IF( |
1419 | std::is_convertible<T, basic_string_view<char_type>>::value && |
1420 | !is_string<T>::value && !has_formatter<T, Context>::value && |
1421 | !has_fallback_formatter<T, char_type>::value)> |
1422 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1423 | -> basic_string_view<char_type> { |
1424 | return basic_string_view<char_type>(val); |
1425 | } |
1426 | template <typename T, |
1427 | FMT_ENABLE_IF( |
1428 | std::is_convertible<T, std_string_view<char_type>>::value && |
1429 | !std::is_convertible<T, basic_string_view<char_type>>::value && |
1430 | !is_string<T>::value && !has_formatter<T, Context>::value && |
1431 | !has_fallback_formatter<T, char_type>::value)> |
1432 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1433 | -> basic_string_view<char_type> { |
1434 | return std_string_view<char_type>(val); |
1435 | } |
1436 | |
1437 | FMT_CONSTEXPR FMT_INLINE auto map(void* val) -> const void* { return val; } |
1438 | FMT_CONSTEXPR FMT_INLINE auto map(const void* val) -> const void* { |
1439 | return val; |
1440 | } |
1441 | FMT_CONSTEXPR FMT_INLINE auto map(std::nullptr_t val) -> const void* { |
1442 | return val; |
1443 | } |
1444 | |
1445 | // We use SFINAE instead of a const T* parameter to avoid conflicting with |
1446 | // the C array overload. |
1447 | template < |
1448 | typename T, |
1449 | FMT_ENABLE_IF( |
1450 | std::is_pointer<T>::value || std::is_member_pointer<T>::value || |
1451 | std::is_function<typename std::remove_pointer<T>::type>::value || |
1452 | (std::is_convertible<const T&, const void*>::value && |
1453 | !std::is_convertible<const T&, const char_type*>::value && |
1454 | !has_formatter<T, Context>::value))> |
1455 | FMT_CONSTEXPR auto map(const T&) -> unformattable_pointer { |
1456 | return {}; |
1457 | } |
1458 | |
1459 | template <typename T, std::size_t N, |
1460 | FMT_ENABLE_IF(!std::is_same<T, wchar_t>::value)> |
1461 | FMT_CONSTEXPR FMT_INLINE auto map(const T (&values)[N]) -> const T (&)[N] { |
1462 | return values; |
1463 | } |
1464 | |
1465 | template <typename T, |
1466 | FMT_ENABLE_IF( |
1467 | std::is_enum<T>::value&& std::is_convertible<T, int>::value && |
1468 | !has_format_as<T>::value && !has_formatter<T, Context>::value && |
1469 | !has_fallback_formatter<T, char_type>::value)> |
1470 | FMT_DEPRECATED FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1471 | -> decltype(std::declval<arg_mapper>().map( |
1472 | static_cast<underlying_t<T>>(val))) { |
1473 | return map(static_cast<underlying_t<T>>(val)); |
1474 | } |
1475 | |
1476 | template <typename T, FMT_ENABLE_IF(has_format_as<T>::value && |
1477 | !has_formatter<T, Context>::value)> |
1478 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1479 | -> decltype(std::declval<arg_mapper>().map(format_as(T()))) { |
1480 | return map(format_as(val)); |
1481 | } |
1482 | |
1483 | template <typename T, typename U = remove_cvref_t<T>> |
1484 | struct formattable |
1485 | : bool_constant<has_const_formatter<U, Context>() || |
1486 | !std::is_const<remove_reference_t<T>>::value || |
1487 | has_fallback_formatter<U, char_type>::value> {}; |
1488 | |
1489 | #if (FMT_MSC_VERSION != 0 && FMT_MSC_VERSION < 1910) || \ |
1490 | FMT_ICC_VERSION != 0 || defined(__NVCC__) |
1491 | // Workaround a bug in MSVC and Intel (Issue 2746). |
1492 | template <typename T> FMT_CONSTEXPR FMT_INLINE auto do_map(T&& val) -> T& { |
1493 | return val; |
1494 | } |
1495 | #else |
1496 | template <typename T, FMT_ENABLE_IF(formattable<T>::value)> |
1497 | FMT_CONSTEXPR FMT_INLINE auto do_map(T&& val) -> T& { |
1498 | return val; |
1499 | } |
1500 | template <typename T, FMT_ENABLE_IF(!formattable<T>::value)> |
1501 | FMT_CONSTEXPR FMT_INLINE auto do_map(T&&) -> unformattable_const { |
1502 | return {}; |
1503 | } |
1504 | #endif |
1505 | |
1506 | template <typename T, typename U = remove_cvref_t<T>, |
1507 | FMT_ENABLE_IF(!is_string<U>::value && !is_char<U>::value && |
1508 | !std::is_array<U>::value && |
1509 | !std::is_pointer<U>::value && |
1510 | !has_format_as<U>::value && |
1511 | (has_formatter<U, Context>::value || |
1512 | has_fallback_formatter<U, char_type>::value))> |
1513 | FMT_CONSTEXPR FMT_INLINE auto map(T&& val) |
1514 | -> decltype(this->do_map(std::forward<T>(val))) { |
1515 | return do_map(std::forward<T>(val)); |
1516 | } |
1517 | |
1518 | template <typename T, FMT_ENABLE_IF(is_named_arg<T>::value)> |
1519 | FMT_CONSTEXPR FMT_INLINE auto map(const T& named_arg) |
1520 | -> decltype(std::declval<arg_mapper>().map(named_arg.value)) { |
1521 | return map(named_arg.value); |
1522 | } |
1523 | |
1524 | auto map(...) -> unformattable { return {}; } |
1525 | }; |
1526 | |
1527 | // A type constant after applying arg_mapper<Context>. |
1528 | template <typename T, typename Context> |
1529 | using mapped_type_constant = |
1530 | type_constant<decltype(arg_mapper<Context>().map(std::declval<const T&>())), |
1531 | typename Context::char_type>; |
1532 | |
1533 | enum { packed_arg_bits = 4 }; |
1534 | // Maximum number of arguments with packed types. |
1535 | enum { max_packed_args = 62 / packed_arg_bits }; |
1536 | enum : unsigned long long { is_unpacked_bit = 1ULL << 63 }; |
1537 | enum : unsigned long long { has_named_args_bit = 1ULL << 62 }; |
1538 | |
1539 | FMT_END_DETAIL_NAMESPACE |
1540 | |
1541 | // An output iterator that appends to a buffer. |
1542 | // It is used to reduce symbol sizes for the common case. |
1543 | class appender : public std::back_insert_iterator<detail::buffer<char>> { |
1544 | using base = std::back_insert_iterator<detail::buffer<char>>; |
1545 | |
1546 | template <typename T> |
1547 | friend auto get_buffer(appender out) -> detail::buffer<char>& { |
1548 | return detail::get_container(out); |
1549 | } |
1550 | |
1551 | public: |
1552 | using std::back_insert_iterator<detail::buffer<char>>::back_insert_iterator; |
1553 | appender(base it) noexcept : base(it) {} |
1554 | FMT_UNCHECKED_ITERATOR(appender); |
1555 | |
1556 | auto operator++() noexcept -> appender& { return *this; } |
1557 | auto operator++(int) noexcept -> appender { return *this; } |
1558 | }; |
1559 | |
1560 | // A formatting argument. It is a trivially copyable/constructible type to |
1561 | // allow storage in basic_memory_buffer. |
1562 | template <typename Context> class basic_format_arg { |
1563 | private: |
1564 | detail::value<Context> value_; |
1565 | detail::type type_; |
1566 | |
1567 | template <typename ContextType, typename T> |
1568 | friend FMT_CONSTEXPR auto detail::make_arg(T&& value) |
1569 | -> basic_format_arg<ContextType>; |
1570 | |
1571 | template <typename Visitor, typename Ctx> |
1572 | friend FMT_CONSTEXPR auto visit_format_arg(Visitor&& vis, |
1573 | const basic_format_arg<Ctx>& arg) |
1574 | -> decltype(vis(0)); |
1575 | |
1576 | friend class basic_format_args<Context>; |
1577 | friend class dynamic_format_arg_store<Context>; |
1578 | |
1579 | using char_type = typename Context::char_type; |
1580 | |
1581 | template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS> |
1582 | friend struct detail::arg_data; |
1583 | |
1584 | basic_format_arg(const detail::named_arg_info<char_type>* args, size_t size) |
1585 | : value_(args, size) {} |
1586 | |
1587 | public: |
1588 | class handle { |
1589 | public: |
1590 | explicit handle(detail::custom_value<Context> custom) : custom_(custom) {} |
1591 | |
1592 | void format(typename Context::parse_context_type& parse_ctx, |
1593 | Context& ctx) const { |
1594 | custom_.format(custom_.value, parse_ctx, ctx); |
1595 | } |
1596 | |
1597 | private: |
1598 | detail::custom_value<Context> custom_; |
1599 | }; |
1600 | |
1601 | constexpr basic_format_arg() : type_(detail::type::none_type) {} |
1602 | |
1603 | constexpr explicit operator bool() const noexcept { |
1604 | return type_ != detail::type::none_type; |
1605 | } |
1606 | |
1607 | auto type() const -> detail::type { return type_; } |
1608 | |
1609 | auto is_integral() const -> bool { return detail::is_integral_type(type_); } |
1610 | auto is_arithmetic() const -> bool { |
1611 | return detail::is_arithmetic_type(type_); |
1612 | } |
1613 | }; |
1614 | |
1615 | /** |
1616 | \rst |
1617 | Visits an argument dispatching to the appropriate visit method based on |
1618 | the argument type. For example, if the argument type is ``double`` then |
1619 | ``vis(value)`` will be called with the value of type ``double``. |
1620 | \endrst |
1621 | */ |
1622 | template <typename Visitor, typename Context> |
1623 | FMT_CONSTEXPR FMT_INLINE auto visit_format_arg( |
1624 | Visitor&& vis, const basic_format_arg<Context>& arg) -> decltype(vis(0)) { |
1625 | switch (arg.type_) { |
1626 | case detail::type::none_type: |
1627 | break; |
1628 | case detail::type::int_type: |
1629 | return vis(arg.value_.int_value); |
1630 | case detail::type::uint_type: |
1631 | return vis(arg.value_.uint_value); |
1632 | case detail::type::long_long_type: |
1633 | return vis(arg.value_.long_long_value); |
1634 | case detail::type::ulong_long_type: |
1635 | return vis(arg.value_.ulong_long_value); |
1636 | case detail::type::int128_type: |
1637 | return vis(detail::convert_for_visit(arg.value_.int128_value)); |
1638 | case detail::type::uint128_type: |
1639 | return vis(detail::convert_for_visit(arg.value_.uint128_value)); |
1640 | case detail::type::bool_type: |
1641 | return vis(arg.value_.bool_value); |
1642 | case detail::type::char_type: |
1643 | return vis(arg.value_.char_value); |
1644 | case detail::type::float_type: |
1645 | return vis(arg.value_.float_value); |
1646 | case detail::type::double_type: |
1647 | return vis(arg.value_.double_value); |
1648 | case detail::type::long_double_type: |
1649 | return vis(arg.value_.long_double_value); |
1650 | case detail::type::cstring_type: |
1651 | return vis(arg.value_.string.data); |
1652 | case detail::type::string_type: |
1653 | using sv = basic_string_view<typename Context::char_type>; |
1654 | return vis(sv(arg.value_.string.data, arg.value_.string.size)); |
1655 | case detail::type::pointer_type: |
1656 | return vis(arg.value_.pointer); |
1657 | case detail::type::custom_type: |
1658 | return vis(typename basic_format_arg<Context>::handle(arg.value_.custom)); |
1659 | } |
1660 | return vis(monostate()); |
1661 | } |
1662 | |
1663 | FMT_BEGIN_DETAIL_NAMESPACE |
1664 | |
1665 | template <typename Char, typename InputIt> |
1666 | auto copy_str(InputIt begin, InputIt end, appender out) -> appender { |
1667 | get_container(out).append(begin, end); |
1668 | return out; |
1669 | } |
1670 | |
1671 | template <typename Char, typename R, typename OutputIt> |
1672 | FMT_CONSTEXPR auto copy_str(R&& rng, OutputIt out) -> OutputIt { |
1673 | return detail::copy_str<Char>(rng.begin(), rng.end(), out); |
1674 | } |
1675 | |
1676 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 500 |
1677 | // A workaround for gcc 4.8 to make void_t work in a SFINAE context. |
1678 | template <typename... Ts> struct void_t_impl { using type = void; }; |
1679 | template <typename... Ts> |
1680 | using void_t = typename detail::void_t_impl<Ts...>::type; |
1681 | #else |
1682 | template <typename...> using void_t = void; |
1683 | #endif |
1684 | |
1685 | template <typename It, typename T, typename Enable = void> |
1686 | struct is_output_iterator : std::false_type {}; |
1687 | |
1688 | template <typename It, typename T> |
1689 | struct is_output_iterator< |
1690 | It, T, |
1691 | void_t<typename std::iterator_traits<It>::iterator_category, |
1692 | decltype(*std::declval<It>() = std::declval<T>())>> |
1693 | : std::true_type {}; |
1694 | |
1695 | template <typename OutputIt> |
1696 | struct is_back_insert_iterator : std::false_type {}; |
1697 | template <typename Container> |
1698 | struct is_back_insert_iterator<std::back_insert_iterator<Container>> |
1699 | : std::true_type {}; |
1700 | |
1701 | template <typename OutputIt> |
1702 | struct is_contiguous_back_insert_iterator : std::false_type {}; |
1703 | template <typename Container> |
1704 | struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>> |
1705 | : is_contiguous<Container> {}; |
1706 | template <> |
1707 | struct is_contiguous_back_insert_iterator<appender> : std::true_type {}; |
1708 | |
1709 | // A type-erased reference to an std::locale to avoid a heavy <locale> include. |
1710 | class locale_ref { |
1711 | private: |
1712 | const void* locale_; // A type-erased pointer to std::locale. |
1713 | |
1714 | public: |
1715 | constexpr locale_ref() : locale_(nullptr) {} |
1716 | template <typename Locale> explicit locale_ref(const Locale& loc); |
1717 | |
1718 | explicit operator bool() const noexcept { return locale_ != nullptr; } |
1719 | |
1720 | template <typename Locale> auto get() const -> Locale; |
1721 | }; |
1722 | |
1723 | template <typename> constexpr auto encode_types() -> unsigned long long { |
1724 | return 0; |
1725 | } |
1726 | |
1727 | template <typename Context, typename Arg, typename... Args> |
1728 | constexpr auto encode_types() -> unsigned long long { |
1729 | return static_cast<unsigned>(mapped_type_constant<Arg, Context>::value) | |
1730 | (encode_types<Context, Args...>() << packed_arg_bits); |
1731 | } |
1732 | |
1733 | template <typename Context, typename T> |
1734 | FMT_CONSTEXPR FMT_INLINE auto make_value(T&& val) -> value<Context> { |
1735 | const auto& arg = arg_mapper<Context>().map(FMT_FORWARD(val)); |
1736 | |
1737 | constexpr bool formattable_char = |
1738 | !std::is_same<decltype(arg), const unformattable_char&>::value; |
1739 | static_assert(formattable_char, "Mixing character types is disallowed." ); |
1740 | |
1741 | constexpr bool formattable_const = |
1742 | !std::is_same<decltype(arg), const unformattable_const&>::value; |
1743 | static_assert(formattable_const, "Cannot format a const argument." ); |
1744 | |
1745 | // Formatting of arbitrary pointers is disallowed. If you want to output |
1746 | // a pointer cast it to "void *" or "const void *". In particular, this |
1747 | // forbids formatting of "[const] volatile char *" which is printed as bool |
1748 | // by iostreams. |
1749 | constexpr bool formattable_pointer = |
1750 | !std::is_same<decltype(arg), const unformattable_pointer&>::value; |
1751 | static_assert(formattable_pointer, |
1752 | "Formatting of non-void pointers is disallowed." ); |
1753 | |
1754 | constexpr bool formattable = |
1755 | !std::is_same<decltype(arg), const unformattable&>::value; |
1756 | static_assert( |
1757 | formattable, |
1758 | "Cannot format an argument. To make type T formattable provide a " |
1759 | "formatter<T> specialization: https://fmt.dev/latest/api.html#udt" ); |
1760 | return {arg}; |
1761 | } |
1762 | |
1763 | template <typename Context, typename T> |
1764 | FMT_CONSTEXPR auto make_arg(T&& value) -> basic_format_arg<Context> { |
1765 | basic_format_arg<Context> arg; |
1766 | arg.type_ = mapped_type_constant<T, Context>::value; |
1767 | arg.value_ = make_value<Context>(value); |
1768 | return arg; |
1769 | } |
1770 | |
1771 | // The type template parameter is there to avoid an ODR violation when using |
1772 | // a fallback formatter in one translation unit and an implicit conversion in |
1773 | // another (not recommended). |
1774 | template <bool IS_PACKED, typename Context, type, typename T, |
1775 | FMT_ENABLE_IF(IS_PACKED)> |
1776 | FMT_CONSTEXPR FMT_INLINE auto make_arg(T&& val) -> value<Context> { |
1777 | return make_value<Context>(val); |
1778 | } |
1779 | |
1780 | template <bool IS_PACKED, typename Context, type, typename T, |
1781 | FMT_ENABLE_IF(!IS_PACKED)> |
1782 | FMT_CONSTEXPR inline auto make_arg(T&& value) -> basic_format_arg<Context> { |
1783 | return make_arg<Context>(value); |
1784 | } |
1785 | FMT_END_DETAIL_NAMESPACE |
1786 | |
1787 | // Formatting context. |
1788 | template <typename OutputIt, typename Char> class basic_format_context { |
1789 | public: |
1790 | /** The character type for the output. */ |
1791 | using char_type = Char; |
1792 | |
1793 | private: |
1794 | OutputIt out_; |
1795 | basic_format_args<basic_format_context> args_; |
1796 | detail::locale_ref loc_; |
1797 | |
1798 | public: |
1799 | using iterator = OutputIt; |
1800 | using format_arg = basic_format_arg<basic_format_context>; |
1801 | using parse_context_type = basic_format_parse_context<Char>; |
1802 | template <typename T> using formatter_type = formatter<T, char_type>; |
1803 | |
1804 | basic_format_context(basic_format_context&&) = default; |
1805 | basic_format_context(const basic_format_context&) = delete; |
1806 | void operator=(const basic_format_context&) = delete; |
1807 | /** |
1808 | Constructs a ``basic_format_context`` object. References to the arguments are |
1809 | stored in the object so make sure they have appropriate lifetimes. |
1810 | */ |
1811 | constexpr basic_format_context( |
1812 | OutputIt out, basic_format_args<basic_format_context> ctx_args, |
1813 | detail::locale_ref loc = detail::locale_ref()) |
1814 | : out_(out), args_(ctx_args), loc_(loc) {} |
1815 | |
1816 | constexpr auto arg(int id) const -> format_arg { return args_.get(id); } |
1817 | FMT_CONSTEXPR auto arg(basic_string_view<char_type> name) -> format_arg { |
1818 | return args_.get(name); |
1819 | } |
1820 | FMT_CONSTEXPR auto arg_id(basic_string_view<char_type> name) -> int { |
1821 | return args_.get_id(name); |
1822 | } |
1823 | auto args() const -> const basic_format_args<basic_format_context>& { |
1824 | return args_; |
1825 | } |
1826 | |
1827 | FMT_CONSTEXPR auto error_handler() -> detail::error_handler { return {}; } |
1828 | void on_error(const char* message) { error_handler().on_error(message); } |
1829 | |
1830 | // Returns an iterator to the beginning of the output range. |
1831 | FMT_CONSTEXPR auto out() -> iterator { return out_; } |
1832 | |
1833 | // Advances the begin iterator to ``it``. |
1834 | void advance_to(iterator it) { |
1835 | if (!detail::is_back_insert_iterator<iterator>()) out_ = it; |
1836 | } |
1837 | |
1838 | FMT_CONSTEXPR auto locale() -> detail::locale_ref { return loc_; } |
1839 | }; |
1840 | |
1841 | template <typename Char> |
1842 | using buffer_context = |
1843 | basic_format_context<detail::buffer_appender<Char>, Char>; |
1844 | using format_context = buffer_context<char>; |
1845 | |
1846 | // Workaround an alias issue: https://stackoverflow.com/q/62767544/471164. |
1847 | #define FMT_BUFFER_CONTEXT(Char) \ |
1848 | basic_format_context<detail::buffer_appender<Char>, Char> |
1849 | |
1850 | template <typename T, typename Char = char> |
1851 | using is_formattable = bool_constant< |
1852 | !std::is_base_of<detail::unformattable, |
1853 | decltype(detail::arg_mapper<buffer_context<Char>>().map( |
1854 | std::declval<T>()))>::value && |
1855 | !detail::has_fallback_formatter<T, Char>::value>; |
1856 | |
1857 | /** |
1858 | \rst |
1859 | An array of references to arguments. It can be implicitly converted into |
1860 | `~fmt::basic_format_args` for passing into type-erased formatting functions |
1861 | such as `~fmt::vformat`. |
1862 | \endrst |
1863 | */ |
1864 | template <typename Context, typename... Args> |
1865 | class format_arg_store |
1866 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
1867 | // Workaround a GCC template argument substitution bug. |
1868 | : public basic_format_args<Context> |
1869 | #endif |
1870 | { |
1871 | private: |
1872 | static const size_t num_args = sizeof...(Args); |
1873 | static const size_t num_named_args = detail::count_named_args<Args...>(); |
1874 | static const bool is_packed = num_args <= detail::max_packed_args; |
1875 | |
1876 | using value_type = conditional_t<is_packed, detail::value<Context>, |
1877 | basic_format_arg<Context>>; |
1878 | |
1879 | detail::arg_data<value_type, typename Context::char_type, num_args, |
1880 | num_named_args> |
1881 | data_; |
1882 | |
1883 | friend class basic_format_args<Context>; |
1884 | |
1885 | static constexpr unsigned long long desc = |
1886 | (is_packed ? detail::encode_types<Context, Args...>() |
1887 | : detail::is_unpacked_bit | num_args) | |
1888 | (num_named_args != 0 |
1889 | ? static_cast<unsigned long long>(detail::has_named_args_bit) |
1890 | : 0); |
1891 | |
1892 | public: |
1893 | template <typename... T> |
1894 | FMT_CONSTEXPR FMT_INLINE format_arg_store(T&&... args) |
1895 | : |
1896 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
1897 | basic_format_args<Context>(*this), |
1898 | #endif |
1899 | data_{detail::make_arg< |
1900 | is_packed, Context, |
1901 | detail::mapped_type_constant<remove_cvref_t<T>, Context>::value>( |
1902 | FMT_FORWARD(args))...} { |
1903 | detail::init_named_args(data_.named_args(), 0, 0, args...); |
1904 | } |
1905 | }; |
1906 | |
1907 | /** |
1908 | \rst |
1909 | Constructs a `~fmt::format_arg_store` object that contains references to |
1910 | arguments and can be implicitly converted to `~fmt::format_args`. `Context` |
1911 | can be omitted in which case it defaults to `~fmt::context`. |
1912 | See `~fmt::arg` for lifetime considerations. |
1913 | \endrst |
1914 | */ |
1915 | template <typename Context = format_context, typename... Args> |
1916 | constexpr auto make_format_args(Args&&... args) |
1917 | -> format_arg_store<Context, remove_cvref_t<Args>...> { |
1918 | return {FMT_FORWARD(args)...}; |
1919 | } |
1920 | |
1921 | /** |
1922 | \rst |
1923 | Returns a named argument to be used in a formatting function. |
1924 | It should only be used in a call to a formatting function or |
1925 | `dynamic_format_arg_store::push_back`. |
1926 | |
1927 | **Example**:: |
1928 | |
1929 | fmt::print("Elapsed time: {s:.2f} seconds", fmt::arg("s", 1.23)); |
1930 | \endrst |
1931 | */ |
1932 | template <typename Char, typename T> |
1933 | inline auto arg(const Char* name, const T& arg) -> detail::named_arg<Char, T> { |
1934 | static_assert(!detail::is_named_arg<T>(), "nested named arguments" ); |
1935 | return {name, arg}; |
1936 | } |
1937 | |
1938 | /** |
1939 | \rst |
1940 | A view of a collection of formatting arguments. To avoid lifetime issues it |
1941 | should only be used as a parameter type in type-erased functions such as |
1942 | ``vformat``:: |
1943 | |
1944 | void vlog(string_view format_str, format_args args); // OK |
1945 | format_args args = make_format_args(42); // Error: dangling reference |
1946 | \endrst |
1947 | */ |
1948 | template <typename Context> class basic_format_args { |
1949 | public: |
1950 | using size_type = int; |
1951 | using format_arg = basic_format_arg<Context>; |
1952 | |
1953 | private: |
1954 | // A descriptor that contains information about formatting arguments. |
1955 | // If the number of arguments is less or equal to max_packed_args then |
1956 | // argument types are passed in the descriptor. This reduces binary code size |
1957 | // per formatting function call. |
1958 | unsigned long long desc_; |
1959 | union { |
1960 | // If is_packed() returns true then argument values are stored in values_; |
1961 | // otherwise they are stored in args_. This is done to improve cache |
1962 | // locality and reduce compiled code size since storing larger objects |
1963 | // may require more code (at least on x86-64) even if the same amount of |
1964 | // data is actually copied to stack. It saves ~10% on the bloat test. |
1965 | const detail::value<Context>* values_; |
1966 | const format_arg* args_; |
1967 | }; |
1968 | |
1969 | constexpr auto is_packed() const -> bool { |
1970 | return (desc_ & detail::is_unpacked_bit) == 0; |
1971 | } |
1972 | auto has_named_args() const -> bool { |
1973 | return (desc_ & detail::has_named_args_bit) != 0; |
1974 | } |
1975 | |
1976 | FMT_CONSTEXPR auto type(int index) const -> detail::type { |
1977 | int shift = index * detail::packed_arg_bits; |
1978 | unsigned int mask = (1 << detail::packed_arg_bits) - 1; |
1979 | return static_cast<detail::type>((desc_ >> shift) & mask); |
1980 | } |
1981 | |
1982 | constexpr FMT_INLINE basic_format_args(unsigned long long desc, |
1983 | const detail::value<Context>* values) |
1984 | : desc_(desc), values_(values) {} |
1985 | constexpr basic_format_args(unsigned long long desc, const format_arg* args) |
1986 | : desc_(desc), args_(args) {} |
1987 | |
1988 | public: |
1989 | constexpr basic_format_args() : desc_(0), args_(nullptr) {} |
1990 | |
1991 | /** |
1992 | \rst |
1993 | Constructs a `basic_format_args` object from `~fmt::format_arg_store`. |
1994 | \endrst |
1995 | */ |
1996 | template <typename... Args> |
1997 | constexpr FMT_INLINE basic_format_args( |
1998 | const format_arg_store<Context, Args...>& store) |
1999 | : basic_format_args(format_arg_store<Context, Args...>::desc, |
2000 | store.data_.args()) {} |
2001 | |
2002 | /** |
2003 | \rst |
2004 | Constructs a `basic_format_args` object from |
2005 | `~fmt::dynamic_format_arg_store`. |
2006 | \endrst |
2007 | */ |
2008 | constexpr FMT_INLINE basic_format_args( |
2009 | const dynamic_format_arg_store<Context>& store) |
2010 | : basic_format_args(store.get_types(), store.data()) {} |
2011 | |
2012 | /** |
2013 | \rst |
2014 | Constructs a `basic_format_args` object from a dynamic set of arguments. |
2015 | \endrst |
2016 | */ |
2017 | constexpr basic_format_args(const format_arg* args, int count) |
2018 | : basic_format_args(detail::is_unpacked_bit | detail::to_unsigned(count), |
2019 | args) {} |
2020 | |
2021 | /** Returns the argument with the specified id. */ |
2022 | FMT_CONSTEXPR auto get(int id) const -> format_arg { |
2023 | format_arg arg; |
2024 | if (!is_packed()) { |
2025 | if (id < max_size()) arg = args_[id]; |
2026 | return arg; |
2027 | } |
2028 | if (id >= detail::max_packed_args) return arg; |
2029 | arg.type_ = type(id); |
2030 | if (arg.type_ == detail::type::none_type) return arg; |
2031 | arg.value_ = values_[id]; |
2032 | return arg; |
2033 | } |
2034 | |
2035 | template <typename Char> |
2036 | auto get(basic_string_view<Char> name) const -> format_arg { |
2037 | int id = get_id(name); |
2038 | return id >= 0 ? get(id) : format_arg(); |
2039 | } |
2040 | |
2041 | template <typename Char> |
2042 | auto get_id(basic_string_view<Char> name) const -> int { |
2043 | if (!has_named_args()) return -1; |
2044 | const auto& named_args = |
2045 | (is_packed() ? values_[-1] : args_[-1].value_).named_args; |
2046 | for (size_t i = 0; i < named_args.size; ++i) { |
2047 | if (named_args.data[i].name == name) return named_args.data[i].id; |
2048 | } |
2049 | return -1; |
2050 | } |
2051 | |
2052 | auto max_size() const -> int { |
2053 | unsigned long long max_packed = detail::max_packed_args; |
2054 | return static_cast<int>(is_packed() ? max_packed |
2055 | : desc_ & ~detail::is_unpacked_bit); |
2056 | } |
2057 | }; |
2058 | |
2059 | /** An alias to ``basic_format_args<format_context>``. */ |
2060 | // A separate type would result in shorter symbols but break ABI compatibility |
2061 | // between clang and gcc on ARM (#1919). |
2062 | using format_args = basic_format_args<format_context>; |
2063 | |
2064 | // We cannot use enum classes as bit fields because of a gcc bug, so we put them |
2065 | // in namespaces instead (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414). |
2066 | // Additionally, if an underlying type is specified, older gcc incorrectly warns |
2067 | // that the type is too small. Both bugs are fixed in gcc 9.3. |
2068 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 903 |
2069 | # define FMT_ENUM_UNDERLYING_TYPE(type) |
2070 | #else |
2071 | # define FMT_ENUM_UNDERLYING_TYPE(type) : type |
2072 | #endif |
2073 | namespace align { |
2074 | enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, left, right, center, |
2075 | numeric}; |
2076 | } |
2077 | using align_t = align::type; |
2078 | namespace sign { |
2079 | enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, minus, plus, space}; |
2080 | } |
2081 | using sign_t = sign::type; |
2082 | |
2083 | FMT_BEGIN_DETAIL_NAMESPACE |
2084 | |
2085 | // Workaround an array initialization issue in gcc 4.8. |
2086 | template <typename Char> struct fill_t { |
2087 | private: |
2088 | enum { max_size = 4 }; |
2089 | Char data_[max_size] = {Char(' '), Char(0), Char(0), Char(0)}; |
2090 | unsigned char size_ = 1; |
2091 | |
2092 | public: |
2093 | FMT_CONSTEXPR void operator=(basic_string_view<Char> s) { |
2094 | auto size = s.size(); |
2095 | if (size > max_size) return throw_format_error("invalid fill" ); |
2096 | for (size_t i = 0; i < size; ++i) data_[i] = s[i]; |
2097 | size_ = static_cast<unsigned char>(size); |
2098 | } |
2099 | |
2100 | constexpr auto size() const -> size_t { return size_; } |
2101 | constexpr auto data() const -> const Char* { return data_; } |
2102 | |
2103 | FMT_CONSTEXPR auto operator[](size_t index) -> Char& { return data_[index]; } |
2104 | FMT_CONSTEXPR auto operator[](size_t index) const -> const Char& { |
2105 | return data_[index]; |
2106 | } |
2107 | }; |
2108 | FMT_END_DETAIL_NAMESPACE |
2109 | |
2110 | enum class presentation_type : unsigned char { |
2111 | none, |
2112 | // Integer types should go first, |
2113 | dec, // 'd' |
2114 | oct, // 'o' |
2115 | hex_lower, // 'x' |
2116 | hex_upper, // 'X' |
2117 | bin_lower, // 'b' |
2118 | bin_upper, // 'B' |
2119 | hexfloat_lower, // 'a' |
2120 | hexfloat_upper, // 'A' |
2121 | exp_lower, // 'e' |
2122 | exp_upper, // 'E' |
2123 | fixed_lower, // 'f' |
2124 | fixed_upper, // 'F' |
2125 | general_lower, // 'g' |
2126 | general_upper, // 'G' |
2127 | chr, // 'c' |
2128 | string, // 's' |
2129 | pointer, // 'p' |
2130 | debug // '?' |
2131 | }; |
2132 | |
2133 | // Format specifiers for built-in and string types. |
2134 | template <typename Char> struct basic_format_specs { |
2135 | int width; |
2136 | int precision; |
2137 | presentation_type type; |
2138 | align_t align : 4; |
2139 | sign_t sign : 3; |
2140 | bool alt : 1; // Alternate form ('#'). |
2141 | bool localized : 1; |
2142 | detail::fill_t<Char> fill; |
2143 | |
2144 | constexpr basic_format_specs() |
2145 | : width(0), |
2146 | precision(-1), |
2147 | type(presentation_type::none), |
2148 | align(align::none), |
2149 | sign(sign::none), |
2150 | alt(false), |
2151 | localized(false) {} |
2152 | }; |
2153 | |
2154 | using format_specs = basic_format_specs<char>; |
2155 | |
2156 | FMT_BEGIN_DETAIL_NAMESPACE |
2157 | |
2158 | enum class arg_id_kind { none, index, name }; |
2159 | |
2160 | // An argument reference. |
2161 | template <typename Char> struct arg_ref { |
2162 | FMT_CONSTEXPR arg_ref() : kind(arg_id_kind::none), val() {} |
2163 | |
2164 | FMT_CONSTEXPR explicit arg_ref(int index) |
2165 | : kind(arg_id_kind::index), val(index) {} |
2166 | FMT_CONSTEXPR explicit arg_ref(basic_string_view<Char> name) |
2167 | : kind(arg_id_kind::name), val(name) {} |
2168 | |
2169 | FMT_CONSTEXPR auto operator=(int idx) -> arg_ref& { |
2170 | kind = arg_id_kind::index; |
2171 | val.index = idx; |
2172 | return *this; |
2173 | } |
2174 | |
2175 | arg_id_kind kind; |
2176 | union value { |
2177 | FMT_CONSTEXPR value(int id = 0) : index{id} {} |
2178 | FMT_CONSTEXPR value(basic_string_view<Char> n) : name(n) {} |
2179 | |
2180 | int index; |
2181 | basic_string_view<Char> name; |
2182 | } val; |
2183 | }; |
2184 | |
2185 | // Format specifiers with width and precision resolved at formatting rather |
2186 | // than parsing time to allow re-using the same parsed specifiers with |
2187 | // different sets of arguments (precompilation of format strings). |
2188 | template <typename Char> |
2189 | struct dynamic_format_specs : basic_format_specs<Char> { |
2190 | arg_ref<Char> width_ref; |
2191 | arg_ref<Char> precision_ref; |
2192 | }; |
2193 | |
2194 | struct auto_id {}; |
2195 | |
2196 | // A format specifier handler that sets fields in basic_format_specs. |
2197 | template <typename Char> class specs_setter { |
2198 | protected: |
2199 | basic_format_specs<Char>& specs_; |
2200 | |
2201 | public: |
2202 | explicit FMT_CONSTEXPR specs_setter(basic_format_specs<Char>& specs) |
2203 | : specs_(specs) {} |
2204 | |
2205 | FMT_CONSTEXPR specs_setter(const specs_setter& other) |
2206 | : specs_(other.specs_) {} |
2207 | |
2208 | FMT_CONSTEXPR void on_align(align_t align) { specs_.align = align; } |
2209 | FMT_CONSTEXPR void on_fill(basic_string_view<Char> fill) { |
2210 | specs_.fill = fill; |
2211 | } |
2212 | FMT_CONSTEXPR void on_sign(sign_t s) { specs_.sign = s; } |
2213 | FMT_CONSTEXPR void on_hash() { specs_.alt = true; } |
2214 | FMT_CONSTEXPR void on_localized() { specs_.localized = true; } |
2215 | |
2216 | FMT_CONSTEXPR void on_zero() { |
2217 | if (specs_.align == align::none) specs_.align = align::numeric; |
2218 | specs_.fill[0] = Char('0'); |
2219 | } |
2220 | |
2221 | FMT_CONSTEXPR void on_width(int width) { specs_.width = width; } |
2222 | FMT_CONSTEXPR void on_precision(int precision) { |
2223 | specs_.precision = precision; |
2224 | } |
2225 | FMT_CONSTEXPR void end_precision() {} |
2226 | |
2227 | FMT_CONSTEXPR void on_type(presentation_type type) { specs_.type = type; } |
2228 | }; |
2229 | |
2230 | // Format spec handler that saves references to arguments representing dynamic |
2231 | // width and precision to be resolved at formatting time. |
2232 | template <typename ParseContext> |
2233 | class dynamic_specs_handler |
2234 | : public specs_setter<typename ParseContext::char_type> { |
2235 | public: |
2236 | using char_type = typename ParseContext::char_type; |
2237 | |
2238 | FMT_CONSTEXPR dynamic_specs_handler(dynamic_format_specs<char_type>& specs, |
2239 | ParseContext& ctx) |
2240 | : specs_setter<char_type>(specs), specs_(specs), context_(ctx) {} |
2241 | |
2242 | FMT_CONSTEXPR dynamic_specs_handler(const dynamic_specs_handler& other) |
2243 | : specs_setter<char_type>(other), |
2244 | specs_(other.specs_), |
2245 | context_(other.context_) {} |
2246 | |
2247 | template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
2248 | specs_.width_ref = make_arg_ref(arg_id); |
2249 | } |
2250 | |
2251 | template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
2252 | specs_.precision_ref = make_arg_ref(arg_id); |
2253 | } |
2254 | |
2255 | FMT_CONSTEXPR void on_error(const char* message) { |
2256 | context_.on_error(message); |
2257 | } |
2258 | |
2259 | private: |
2260 | dynamic_format_specs<char_type>& specs_; |
2261 | ParseContext& context_; |
2262 | |
2263 | using arg_ref_type = arg_ref<char_type>; |
2264 | |
2265 | FMT_CONSTEXPR auto make_arg_ref(int arg_id) -> arg_ref_type { |
2266 | context_.check_arg_id(arg_id); |
2267 | context_.check_dynamic_spec(arg_id); |
2268 | return arg_ref_type(arg_id); |
2269 | } |
2270 | |
2271 | FMT_CONSTEXPR auto make_arg_ref(auto_id) -> arg_ref_type { |
2272 | int arg_id = context_.next_arg_id(); |
2273 | context_.check_dynamic_spec(arg_id); |
2274 | return arg_ref_type(arg_id); |
2275 | } |
2276 | |
2277 | FMT_CONSTEXPR auto make_arg_ref(basic_string_view<char_type> arg_id) |
2278 | -> arg_ref_type { |
2279 | context_.check_arg_id(arg_id); |
2280 | basic_string_view<char_type> format_str( |
2281 | context_.begin(), to_unsigned(context_.end() - context_.begin())); |
2282 | return arg_ref_type(arg_id); |
2283 | } |
2284 | }; |
2285 | |
2286 | template <typename Char> constexpr bool is_ascii_letter(Char c) { |
2287 | return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); |
2288 | } |
2289 | |
2290 | // Converts a character to ASCII. Returns a number > 127 on conversion failure. |
2291 | template <typename Char, FMT_ENABLE_IF(std::is_integral<Char>::value)> |
2292 | constexpr auto to_ascii(Char c) -> Char { |
2293 | return c; |
2294 | } |
2295 | template <typename Char, FMT_ENABLE_IF(std::is_enum<Char>::value)> |
2296 | constexpr auto to_ascii(Char c) -> underlying_t<Char> { |
2297 | return c; |
2298 | } |
2299 | |
2300 | FMT_CONSTEXPR inline auto code_point_length_impl(char c) -> int { |
2301 | return "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\0\0\0\0\0\0\0\0\2\2\2\2\3\3\4" |
2302 | [static_cast<unsigned char>(c) >> 3]; |
2303 | } |
2304 | |
2305 | template <typename Char> |
2306 | FMT_CONSTEXPR auto code_point_length(const Char* begin) -> int { |
2307 | if (const_check(sizeof(Char) != 1)) return 1; |
2308 | int len = code_point_length_impl(static_cast<char>(*begin)); |
2309 | |
2310 | // Compute the pointer to the next character early so that the next |
2311 | // iteration can start working on the next character. Neither Clang |
2312 | // nor GCC figure out this reordering on their own. |
2313 | return len + !len; |
2314 | } |
2315 | |
2316 | // Return the result via the out param to workaround gcc bug 77539. |
2317 | template <bool IS_CONSTEXPR, typename T, typename Ptr = const T*> |
2318 | FMT_CONSTEXPR auto find(Ptr first, Ptr last, T value, Ptr& out) -> bool { |
2319 | for (out = first; out != last; ++out) { |
2320 | if (*out == value) return true; |
2321 | } |
2322 | return false; |
2323 | } |
2324 | |
2325 | template <> |
2326 | inline auto find<false, char>(const char* first, const char* last, char value, |
2327 | const char*& out) -> bool { |
2328 | out = static_cast<const char*>( |
2329 | std::memchr(first, value, to_unsigned(last - first))); |
2330 | return out != nullptr; |
2331 | } |
2332 | |
2333 | // Parses the range [begin, end) as an unsigned integer. This function assumes |
2334 | // that the range is non-empty and the first character is a digit. |
2335 | template <typename Char> |
2336 | FMT_CONSTEXPR auto parse_nonnegative_int(const Char*& begin, const Char* end, |
2337 | int error_value) noexcept -> int { |
2338 | FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', "" ); |
2339 | unsigned value = 0, prev = 0; |
2340 | auto p = begin; |
2341 | do { |
2342 | prev = value; |
2343 | value = value * 10 + unsigned(*p - '0'); |
2344 | ++p; |
2345 | } while (p != end && '0' <= *p && *p <= '9'); |
2346 | auto num_digits = p - begin; |
2347 | begin = p; |
2348 | if (num_digits <= std::numeric_limits<int>::digits10) |
2349 | return static_cast<int>(value); |
2350 | // Check for overflow. |
2351 | const unsigned max = to_unsigned((std::numeric_limits<int>::max)()); |
2352 | return num_digits == std::numeric_limits<int>::digits10 + 1 && |
2353 | prev * 10ull + unsigned(p[-1] - '0') <= max |
2354 | ? static_cast<int>(value) |
2355 | : error_value; |
2356 | } |
2357 | |
2358 | // Parses fill and alignment. |
2359 | template <typename Char, typename Handler> |
2360 | FMT_CONSTEXPR auto parse_align(const Char* begin, const Char* end, |
2361 | Handler&& handler) -> const Char* { |
2362 | FMT_ASSERT(begin != end, "" ); |
2363 | auto align = align::none; |
2364 | auto p = begin + code_point_length(begin); |
2365 | if (end - p <= 0) p = begin; |
2366 | for (;;) { |
2367 | switch (to_ascii(*p)) { |
2368 | case '<': |
2369 | align = align::left; |
2370 | break; |
2371 | case '>': |
2372 | align = align::right; |
2373 | break; |
2374 | case '^': |
2375 | align = align::center; |
2376 | break; |
2377 | default: |
2378 | break; |
2379 | } |
2380 | if (align != align::none) { |
2381 | if (p != begin) { |
2382 | auto c = *begin; |
2383 | if (c == '{') |
2384 | return handler.on_error("invalid fill character '{'" ), begin; |
2385 | handler.on_fill(basic_string_view<Char>(begin, to_unsigned(p - begin))); |
2386 | begin = p + 1; |
2387 | } else |
2388 | ++begin; |
2389 | handler.on_align(align); |
2390 | break; |
2391 | } else if (p == begin) { |
2392 | break; |
2393 | } |
2394 | p = begin; |
2395 | } |
2396 | return begin; |
2397 | } |
2398 | |
2399 | template <typename Char> FMT_CONSTEXPR bool is_name_start(Char c) { |
2400 | return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || '_' == c; |
2401 | } |
2402 | |
2403 | template <typename Char, typename IDHandler> |
2404 | FMT_CONSTEXPR auto do_parse_arg_id(const Char* begin, const Char* end, |
2405 | IDHandler&& handler) -> const Char* { |
2406 | FMT_ASSERT(begin != end, "" ); |
2407 | Char c = *begin; |
2408 | if (c >= '0' && c <= '9') { |
2409 | int index = 0; |
2410 | if (c != '0') |
2411 | index = |
2412 | parse_nonnegative_int(begin, end, (std::numeric_limits<int>::max)()); |
2413 | else |
2414 | ++begin; |
2415 | if (begin == end || (*begin != '}' && *begin != ':')) |
2416 | handler.on_error("invalid format string" ); |
2417 | else |
2418 | handler(index); |
2419 | return begin; |
2420 | } |
2421 | if (!is_name_start(c)) { |
2422 | handler.on_error("invalid format string" ); |
2423 | return begin; |
2424 | } |
2425 | auto it = begin; |
2426 | do { |
2427 | ++it; |
2428 | } while (it != end && (is_name_start(c = *it) || ('0' <= c && c <= '9'))); |
2429 | handler(basic_string_view<Char>(begin, to_unsigned(it - begin))); |
2430 | return it; |
2431 | } |
2432 | |
2433 | template <typename Char, typename IDHandler> |
2434 | FMT_CONSTEXPR FMT_INLINE auto parse_arg_id(const Char* begin, const Char* end, |
2435 | IDHandler&& handler) -> const Char* { |
2436 | Char c = *begin; |
2437 | if (c != '}' && c != ':') return do_parse_arg_id(begin, end, handler); |
2438 | handler(); |
2439 | return begin; |
2440 | } |
2441 | |
2442 | template <typename Char, typename Handler> |
2443 | FMT_CONSTEXPR auto parse_width(const Char* begin, const Char* end, |
2444 | Handler&& handler) -> const Char* { |
2445 | using detail::auto_id; |
2446 | struct width_adapter { |
2447 | Handler& handler; |
2448 | |
2449 | FMT_CONSTEXPR void operator()() { handler.on_dynamic_width(auto_id()); } |
2450 | FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_width(id); } |
2451 | FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
2452 | handler.on_dynamic_width(id); |
2453 | } |
2454 | FMT_CONSTEXPR void on_error(const char* message) { |
2455 | if (message) handler.on_error(message); |
2456 | } |
2457 | }; |
2458 | |
2459 | FMT_ASSERT(begin != end, "" ); |
2460 | if ('0' <= *begin && *begin <= '9') { |
2461 | int width = parse_nonnegative_int(begin, end, -1); |
2462 | if (width != -1) |
2463 | handler.on_width(width); |
2464 | else |
2465 | handler.on_error("number is too big" ); |
2466 | } else if (*begin == '{') { |
2467 | ++begin; |
2468 | if (begin != end) begin = parse_arg_id(begin, end, width_adapter{handler}); |
2469 | if (begin == end || *begin != '}') |
2470 | return handler.on_error("invalid format string" ), begin; |
2471 | ++begin; |
2472 | } |
2473 | return begin; |
2474 | } |
2475 | |
2476 | template <typename Char, typename Handler> |
2477 | FMT_CONSTEXPR auto parse_precision(const Char* begin, const Char* end, |
2478 | Handler&& handler) -> const Char* { |
2479 | using detail::auto_id; |
2480 | struct precision_adapter { |
2481 | Handler& handler; |
2482 | |
2483 | FMT_CONSTEXPR void operator()() { handler.on_dynamic_precision(auto_id()); } |
2484 | FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_precision(id); } |
2485 | FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
2486 | handler.on_dynamic_precision(id); |
2487 | } |
2488 | FMT_CONSTEXPR void on_error(const char* message) { |
2489 | if (message) handler.on_error(message); |
2490 | } |
2491 | }; |
2492 | |
2493 | ++begin; |
2494 | auto c = begin != end ? *begin : Char(); |
2495 | if ('0' <= c && c <= '9') { |
2496 | auto precision = parse_nonnegative_int(begin, end, -1); |
2497 | if (precision != -1) |
2498 | handler.on_precision(precision); |
2499 | else |
2500 | handler.on_error("number is too big" ); |
2501 | } else if (c == '{') { |
2502 | ++begin; |
2503 | if (begin != end) |
2504 | begin = parse_arg_id(begin, end, precision_adapter{handler}); |
2505 | if (begin == end || *begin++ != '}') |
2506 | return handler.on_error("invalid format string" ), begin; |
2507 | } else { |
2508 | return handler.on_error("missing precision specifier" ), begin; |
2509 | } |
2510 | handler.end_precision(); |
2511 | return begin; |
2512 | } |
2513 | |
2514 | template <typename Char> |
2515 | FMT_CONSTEXPR auto parse_presentation_type(Char type) -> presentation_type { |
2516 | switch (to_ascii(type)) { |
2517 | case 'd': |
2518 | return presentation_type::dec; |
2519 | case 'o': |
2520 | return presentation_type::oct; |
2521 | case 'x': |
2522 | return presentation_type::hex_lower; |
2523 | case 'X': |
2524 | return presentation_type::hex_upper; |
2525 | case 'b': |
2526 | return presentation_type::bin_lower; |
2527 | case 'B': |
2528 | return presentation_type::bin_upper; |
2529 | case 'a': |
2530 | return presentation_type::hexfloat_lower; |
2531 | case 'A': |
2532 | return presentation_type::hexfloat_upper; |
2533 | case 'e': |
2534 | return presentation_type::exp_lower; |
2535 | case 'E': |
2536 | return presentation_type::exp_upper; |
2537 | case 'f': |
2538 | return presentation_type::fixed_lower; |
2539 | case 'F': |
2540 | return presentation_type::fixed_upper; |
2541 | case 'g': |
2542 | return presentation_type::general_lower; |
2543 | case 'G': |
2544 | return presentation_type::general_upper; |
2545 | case 'c': |
2546 | return presentation_type::chr; |
2547 | case 's': |
2548 | return presentation_type::string; |
2549 | case 'p': |
2550 | return presentation_type::pointer; |
2551 | case '?': |
2552 | return presentation_type::debug; |
2553 | default: |
2554 | return presentation_type::none; |
2555 | } |
2556 | } |
2557 | |
2558 | // Parses standard format specifiers and sends notifications about parsed |
2559 | // components to handler. |
2560 | template <typename Char, typename SpecHandler> |
2561 | FMT_CONSTEXPR FMT_INLINE auto parse_format_specs(const Char* begin, |
2562 | const Char* end, |
2563 | SpecHandler&& handler) |
2564 | -> const Char* { |
2565 | if (1 < end - begin && begin[1] == '}' && is_ascii_letter(*begin) && |
2566 | *begin != 'L') { |
2567 | presentation_type type = parse_presentation_type(*begin++); |
2568 | if (type == presentation_type::none) |
2569 | handler.on_error("invalid type specifier" ); |
2570 | handler.on_type(type); |
2571 | return begin; |
2572 | } |
2573 | |
2574 | if (begin == end) return begin; |
2575 | |
2576 | begin = parse_align(begin, end, handler); |
2577 | if (begin == end) return begin; |
2578 | |
2579 | // Parse sign. |
2580 | switch (to_ascii(*begin)) { |
2581 | case '+': |
2582 | handler.on_sign(sign::plus); |
2583 | ++begin; |
2584 | break; |
2585 | case '-': |
2586 | handler.on_sign(sign::minus); |
2587 | ++begin; |
2588 | break; |
2589 | case ' ': |
2590 | handler.on_sign(sign::space); |
2591 | ++begin; |
2592 | break; |
2593 | default: |
2594 | break; |
2595 | } |
2596 | if (begin == end) return begin; |
2597 | |
2598 | if (*begin == '#') { |
2599 | handler.on_hash(); |
2600 | if (++begin == end) return begin; |
2601 | } |
2602 | |
2603 | // Parse zero flag. |
2604 | if (*begin == '0') { |
2605 | handler.on_zero(); |
2606 | if (++begin == end) return begin; |
2607 | } |
2608 | |
2609 | begin = parse_width(begin, end, handler); |
2610 | if (begin == end) return begin; |
2611 | |
2612 | // Parse precision. |
2613 | if (*begin == '.') { |
2614 | begin = parse_precision(begin, end, handler); |
2615 | if (begin == end) return begin; |
2616 | } |
2617 | |
2618 | if (*begin == 'L') { |
2619 | handler.on_localized(); |
2620 | ++begin; |
2621 | } |
2622 | |
2623 | // Parse type. |
2624 | if (begin != end && *begin != '}') { |
2625 | presentation_type type = parse_presentation_type(*begin++); |
2626 | if (type == presentation_type::none) |
2627 | handler.on_error("invalid type specifier" ); |
2628 | handler.on_type(type); |
2629 | } |
2630 | return begin; |
2631 | } |
2632 | |
2633 | template <typename Char, typename Handler> |
2634 | FMT_CONSTEXPR auto parse_replacement_field(const Char* begin, const Char* end, |
2635 | Handler&& handler) -> const Char* { |
2636 | struct id_adapter { |
2637 | Handler& handler; |
2638 | int arg_id; |
2639 | |
2640 | FMT_CONSTEXPR void operator()() { arg_id = handler.on_arg_id(); } |
2641 | FMT_CONSTEXPR void operator()(int id) { arg_id = handler.on_arg_id(id); } |
2642 | FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
2643 | arg_id = handler.on_arg_id(id); |
2644 | } |
2645 | FMT_CONSTEXPR void on_error(const char* message) { |
2646 | if (message) handler.on_error(message); |
2647 | } |
2648 | }; |
2649 | |
2650 | ++begin; |
2651 | if (begin == end) return handler.on_error("invalid format string" ), end; |
2652 | if (*begin == '}') { |
2653 | handler.on_replacement_field(handler.on_arg_id(), begin); |
2654 | } else if (*begin == '{') { |
2655 | handler.on_text(begin, begin + 1); |
2656 | } else { |
2657 | auto adapter = id_adapter{handler, 0}; |
2658 | begin = parse_arg_id(begin, end, adapter); |
2659 | Char c = begin != end ? *begin : Char(); |
2660 | if (c == '}') { |
2661 | handler.on_replacement_field(adapter.arg_id, begin); |
2662 | } else if (c == ':') { |
2663 | begin = handler.on_format_specs(adapter.arg_id, begin + 1, end); |
2664 | if (begin == end || *begin != '}') |
2665 | return handler.on_error("unknown format specifier" ), end; |
2666 | } else { |
2667 | return handler.on_error("missing '}' in format string" ), end; |
2668 | } |
2669 | } |
2670 | return begin + 1; |
2671 | } |
2672 | |
2673 | template <bool IS_CONSTEXPR, typename Char, typename Handler> |
2674 | FMT_CONSTEXPR FMT_INLINE void parse_format_string( |
2675 | basic_string_view<Char> format_str, Handler&& handler) { |
2676 | // Workaround a name-lookup bug in MSVC's modules implementation. |
2677 | using detail::find; |
2678 | |
2679 | auto begin = format_str.data(); |
2680 | auto end = begin + format_str.size(); |
2681 | if (end - begin < 32) { |
2682 | // Use a simple loop instead of memchr for small strings. |
2683 | const Char* p = begin; |
2684 | while (p != end) { |
2685 | auto c = *p++; |
2686 | if (c == '{') { |
2687 | handler.on_text(begin, p - 1); |
2688 | begin = p = parse_replacement_field(p - 1, end, handler); |
2689 | } else if (c == '}') { |
2690 | if (p == end || *p != '}') |
2691 | return handler.on_error("unmatched '}' in format string" ); |
2692 | handler.on_text(begin, p); |
2693 | begin = ++p; |
2694 | } |
2695 | } |
2696 | handler.on_text(begin, end); |
2697 | return; |
2698 | } |
2699 | struct writer { |
2700 | FMT_CONSTEXPR void operator()(const Char* from, const Char* to) { |
2701 | if (from == to) return; |
2702 | for (;;) { |
2703 | const Char* p = nullptr; |
2704 | if (!find<IS_CONSTEXPR>(from, to, Char('}'), p)) |
2705 | return handler_.on_text(from, to); |
2706 | ++p; |
2707 | if (p == to || *p != '}') |
2708 | return handler_.on_error("unmatched '}' in format string" ); |
2709 | handler_.on_text(from, p); |
2710 | from = p + 1; |
2711 | } |
2712 | } |
2713 | Handler& handler_; |
2714 | } write = {handler}; |
2715 | while (begin != end) { |
2716 | // Doing two passes with memchr (one for '{' and another for '}') is up to |
2717 | // 2.5x faster than the naive one-pass implementation on big format strings. |
2718 | const Char* p = begin; |
2719 | if (*begin != '{' && !find<IS_CONSTEXPR>(begin + 1, end, Char('{'), p)) |
2720 | return write(begin, end); |
2721 | write(begin, p); |
2722 | begin = parse_replacement_field(p, end, handler); |
2723 | } |
2724 | } |
2725 | |
2726 | template <typename T, bool = is_named_arg<T>::value> struct strip_named_arg { |
2727 | using type = T; |
2728 | }; |
2729 | template <typename T> struct strip_named_arg<T, true> { |
2730 | using type = remove_cvref_t<decltype(T::value)>; |
2731 | }; |
2732 | |
2733 | template <typename T, typename ParseContext> |
2734 | FMT_CONSTEXPR auto parse_format_specs(ParseContext& ctx) |
2735 | -> decltype(ctx.begin()) { |
2736 | using char_type = typename ParseContext::char_type; |
2737 | using context = buffer_context<char_type>; |
2738 | using stripped_type = typename strip_named_arg<T>::type; |
2739 | using mapped_type = conditional_t< |
2740 | mapped_type_constant<T, context>::value != type::custom_type, |
2741 | decltype(arg_mapper<context>().map(std::declval<const T&>())), |
2742 | stripped_type>; |
2743 | auto f = conditional_t<has_formatter<mapped_type, context>::value, |
2744 | formatter<mapped_type, char_type>, |
2745 | fallback_formatter<stripped_type, char_type>>(); |
2746 | return f.parse(ctx); |
2747 | } |
2748 | |
2749 | template <typename ErrorHandler> |
2750 | FMT_CONSTEXPR void check_int_type_spec(presentation_type type, |
2751 | ErrorHandler&& eh) { |
2752 | if (type > presentation_type::bin_upper && type != presentation_type::chr) |
2753 | eh.on_error("invalid type specifier" ); |
2754 | } |
2755 | |
2756 | // Checks char specs and returns true if the type spec is char (and not int). |
2757 | template <typename Char, typename ErrorHandler = error_handler> |
2758 | FMT_CONSTEXPR auto check_char_specs(const basic_format_specs<Char>& specs, |
2759 | ErrorHandler&& eh = {}) -> bool { |
2760 | if (specs.type != presentation_type::none && |
2761 | specs.type != presentation_type::chr && |
2762 | specs.type != presentation_type::debug) { |
2763 | check_int_type_spec(specs.type, eh); |
2764 | return false; |
2765 | } |
2766 | if (specs.align == align::numeric || specs.sign != sign::none || specs.alt) |
2767 | eh.on_error("invalid format specifier for char" ); |
2768 | return true; |
2769 | } |
2770 | |
2771 | // A floating-point presentation format. |
2772 | enum class float_format : unsigned char { |
2773 | general, // General: exponent notation or fixed point based on magnitude. |
2774 | exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3. |
2775 | fixed, // Fixed point with the default precision of 6, e.g. 0.0012. |
2776 | hex |
2777 | }; |
2778 | |
2779 | struct float_specs { |
2780 | int precision; |
2781 | float_format format : 8; |
2782 | sign_t sign : 8; |
2783 | bool upper : 1; |
2784 | bool locale : 1; |
2785 | bool binary32 : 1; |
2786 | bool showpoint : 1; |
2787 | }; |
2788 | |
2789 | template <typename ErrorHandler = error_handler, typename Char> |
2790 | FMT_CONSTEXPR auto parse_float_type_spec(const basic_format_specs<Char>& specs, |
2791 | ErrorHandler&& eh = {}) |
2792 | -> float_specs { |
2793 | auto result = float_specs(); |
2794 | result.showpoint = specs.alt; |
2795 | result.locale = specs.localized; |
2796 | switch (specs.type) { |
2797 | case presentation_type::none: |
2798 | result.format = float_format::general; |
2799 | break; |
2800 | case presentation_type::general_upper: |
2801 | result.upper = true; |
2802 | FMT_FALLTHROUGH; |
2803 | case presentation_type::general_lower: |
2804 | result.format = float_format::general; |
2805 | break; |
2806 | case presentation_type::exp_upper: |
2807 | result.upper = true; |
2808 | FMT_FALLTHROUGH; |
2809 | case presentation_type::exp_lower: |
2810 | result.format = float_format::exp; |
2811 | result.showpoint |= specs.precision != 0; |
2812 | break; |
2813 | case presentation_type::fixed_upper: |
2814 | result.upper = true; |
2815 | FMT_FALLTHROUGH; |
2816 | case presentation_type::fixed_lower: |
2817 | result.format = float_format::fixed; |
2818 | result.showpoint |= specs.precision != 0; |
2819 | break; |
2820 | case presentation_type::hexfloat_upper: |
2821 | result.upper = true; |
2822 | FMT_FALLTHROUGH; |
2823 | case presentation_type::hexfloat_lower: |
2824 | result.format = float_format::hex; |
2825 | break; |
2826 | default: |
2827 | eh.on_error("invalid type specifier" ); |
2828 | break; |
2829 | } |
2830 | return result; |
2831 | } |
2832 | |
2833 | template <typename ErrorHandler = error_handler> |
2834 | FMT_CONSTEXPR auto check_cstring_type_spec(presentation_type type, |
2835 | ErrorHandler&& eh = {}) -> bool { |
2836 | if (type == presentation_type::none || type == presentation_type::string || |
2837 | type == presentation_type::debug) |
2838 | return true; |
2839 | if (type != presentation_type::pointer) eh.on_error("invalid type specifier" ); |
2840 | return false; |
2841 | } |
2842 | |
2843 | template <typename ErrorHandler = error_handler> |
2844 | FMT_CONSTEXPR void check_string_type_spec(presentation_type type, |
2845 | ErrorHandler&& eh = {}) { |
2846 | if (type != presentation_type::none && type != presentation_type::string && |
2847 | type != presentation_type::debug) |
2848 | eh.on_error("invalid type specifier" ); |
2849 | } |
2850 | |
2851 | template <typename ErrorHandler> |
2852 | FMT_CONSTEXPR void check_pointer_type_spec(presentation_type type, |
2853 | ErrorHandler&& eh) { |
2854 | if (type != presentation_type::none && type != presentation_type::pointer) |
2855 | eh.on_error("invalid type specifier" ); |
2856 | } |
2857 | |
2858 | // A parse_format_specs handler that checks if specifiers are consistent with |
2859 | // the argument type. |
2860 | template <typename Handler> class specs_checker : public Handler { |
2861 | private: |
2862 | detail::type arg_type_; |
2863 | |
2864 | FMT_CONSTEXPR void require_numeric_argument() { |
2865 | if (!is_arithmetic_type(arg_type_)) |
2866 | this->on_error("format specifier requires numeric argument" ); |
2867 | } |
2868 | |
2869 | public: |
2870 | FMT_CONSTEXPR specs_checker(const Handler& handler, detail::type arg_type) |
2871 | : Handler(handler), arg_type_(arg_type) {} |
2872 | |
2873 | FMT_CONSTEXPR void on_align(align_t align) { |
2874 | if (align == align::numeric) require_numeric_argument(); |
2875 | Handler::on_align(align); |
2876 | } |
2877 | |
2878 | FMT_CONSTEXPR void on_sign(sign_t s) { |
2879 | require_numeric_argument(); |
2880 | if (is_integral_type(arg_type_) && arg_type_ != type::int_type && |
2881 | arg_type_ != type::long_long_type && arg_type_ != type::int128_type && |
2882 | arg_type_ != type::char_type) { |
2883 | this->on_error("format specifier requires signed argument" ); |
2884 | } |
2885 | Handler::on_sign(s); |
2886 | } |
2887 | |
2888 | FMT_CONSTEXPR void on_hash() { |
2889 | require_numeric_argument(); |
2890 | Handler::on_hash(); |
2891 | } |
2892 | |
2893 | FMT_CONSTEXPR void on_localized() { |
2894 | require_numeric_argument(); |
2895 | Handler::on_localized(); |
2896 | } |
2897 | |
2898 | FMT_CONSTEXPR void on_zero() { |
2899 | require_numeric_argument(); |
2900 | Handler::on_zero(); |
2901 | } |
2902 | |
2903 | FMT_CONSTEXPR void end_precision() { |
2904 | if (is_integral_type(arg_type_) || arg_type_ == type::pointer_type) |
2905 | this->on_error("precision not allowed for this argument type" ); |
2906 | } |
2907 | }; |
2908 | |
2909 | constexpr int invalid_arg_index = -1; |
2910 | |
2911 | #if FMT_USE_NONTYPE_TEMPLATE_ARGS |
2912 | template <int N, typename T, typename... Args, typename Char> |
2913 | constexpr auto get_arg_index_by_name(basic_string_view<Char> name) -> int { |
2914 | if constexpr (detail::is_statically_named_arg<T>()) { |
2915 | if (name == T::name) return N; |
2916 | } |
2917 | if constexpr (sizeof...(Args) > 0) |
2918 | return get_arg_index_by_name<N + 1, Args...>(name); |
2919 | (void)name; // Workaround an MSVC bug about "unused" parameter. |
2920 | return invalid_arg_index; |
2921 | } |
2922 | #endif |
2923 | |
2924 | template <typename... Args, typename Char> |
2925 | FMT_CONSTEXPR auto get_arg_index_by_name(basic_string_view<Char> name) -> int { |
2926 | #if FMT_USE_NONTYPE_TEMPLATE_ARGS |
2927 | if constexpr (sizeof...(Args) > 0) |
2928 | return get_arg_index_by_name<0, Args...>(name); |
2929 | #endif |
2930 | (void)name; |
2931 | return invalid_arg_index; |
2932 | } |
2933 | |
2934 | template <typename Char, typename ErrorHandler, typename... Args> |
2935 | class format_string_checker { |
2936 | private: |
2937 | // In the future basic_format_parse_context will replace compile_parse_context |
2938 | // here and will use is_constant_evaluated and downcasting to access the data |
2939 | // needed for compile-time checks: https://godbolt.org/z/GvWzcTjh1. |
2940 | using parse_context_type = compile_parse_context<Char, ErrorHandler>; |
2941 | static constexpr int num_args = sizeof...(Args); |
2942 | |
2943 | // Format specifier parsing function. |
2944 | using parse_func = const Char* (*)(parse_context_type&); |
2945 | |
2946 | parse_context_type context_; |
2947 | parse_func parse_funcs_[num_args > 0 ? static_cast<size_t>(num_args) : 1]; |
2948 | type types_[num_args > 0 ? static_cast<size_t>(num_args) : 1]; |
2949 | |
2950 | public: |
2951 | explicit FMT_CONSTEXPR format_string_checker( |
2952 | basic_string_view<Char> format_str, ErrorHandler eh) |
2953 | : context_(format_str, num_args, types_, eh), |
2954 | parse_funcs_{&parse_format_specs<Args, parse_context_type>...}, |
2955 | types_{ |
2956 | mapped_type_constant<Args, |
2957 | basic_format_context<Char*, Char>>::value...} { |
2958 | } |
2959 | |
2960 | FMT_CONSTEXPR void on_text(const Char*, const Char*) {} |
2961 | |
2962 | FMT_CONSTEXPR auto on_arg_id() -> int { return context_.next_arg_id(); } |
2963 | FMT_CONSTEXPR auto on_arg_id(int id) -> int { |
2964 | return context_.check_arg_id(id), id; |
2965 | } |
2966 | FMT_CONSTEXPR auto on_arg_id(basic_string_view<Char> id) -> int { |
2967 | #if FMT_USE_NONTYPE_TEMPLATE_ARGS |
2968 | auto index = get_arg_index_by_name<Args...>(id); |
2969 | if (index == invalid_arg_index) on_error("named argument is not found" ); |
2970 | return context_.check_arg_id(index), index; |
2971 | #else |
2972 | (void)id; |
2973 | on_error("compile-time checks for named arguments require C++20 support" ); |
2974 | return 0; |
2975 | #endif |
2976 | } |
2977 | |
2978 | FMT_CONSTEXPR void on_replacement_field(int, const Char*) {} |
2979 | |
2980 | FMT_CONSTEXPR auto on_format_specs(int id, const Char* begin, const Char*) |
2981 | -> const Char* { |
2982 | context_.advance_to(context_.begin() + (begin - &*context_.begin())); |
2983 | // id >= 0 check is a workaround for gcc 10 bug (#2065). |
2984 | return id >= 0 && id < num_args ? parse_funcs_[id](context_) : begin; |
2985 | } |
2986 | |
2987 | FMT_CONSTEXPR void on_error(const char* message) { |
2988 | context_.on_error(message); |
2989 | } |
2990 | }; |
2991 | |
2992 | // Reports a compile-time error if S is not a valid format string. |
2993 | template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)> |
2994 | FMT_INLINE void check_format_string(const S&) { |
2995 | #ifdef FMT_ENFORCE_COMPILE_STRING |
2996 | static_assert(is_compile_string<S>::value, |
2997 | "FMT_ENFORCE_COMPILE_STRING requires all format strings to use " |
2998 | "FMT_STRING." ); |
2999 | #endif |
3000 | } |
3001 | template <typename... Args, typename S, |
3002 | FMT_ENABLE_IF(is_compile_string<S>::value)> |
3003 | void check_format_string(S format_str) { |
3004 | FMT_CONSTEXPR auto s = basic_string_view<typename S::char_type>(format_str); |
3005 | using checker = format_string_checker<typename S::char_type, error_handler, |
3006 | remove_cvref_t<Args>...>; |
3007 | FMT_CONSTEXPR bool invalid_format = |
3008 | (parse_format_string<true>(s, checker(s, {})), true); |
3009 | ignore_unused(invalid_format); |
3010 | } |
3011 | |
3012 | template <typename Char> |
3013 | void vformat_to( |
3014 | buffer<Char>& buf, basic_string_view<Char> fmt, |
3015 | basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args, |
3016 | locale_ref loc = {}); |
3017 | |
3018 | FMT_API void vprint_mojibake(std::FILE*, string_view, format_args); |
3019 | #ifndef _WIN32 |
3020 | inline void vprint_mojibake(std::FILE*, string_view, format_args) {} |
3021 | #endif |
3022 | FMT_END_DETAIL_NAMESPACE |
3023 | |
3024 | // A formatter specialization for the core types corresponding to detail::type |
3025 | // constants. |
3026 | template <typename T, typename Char> |
3027 | struct formatter<T, Char, |
3028 | enable_if_t<detail::type_constant<T, Char>::value != |
3029 | detail::type::custom_type>> { |
3030 | private: |
3031 | detail::dynamic_format_specs<Char> specs_; |
3032 | |
3033 | public: |
3034 | // Parses format specifiers stopping either at the end of the range or at the |
3035 | // terminating '}'. |
3036 | template <typename ParseContext> |
3037 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
3038 | auto begin = ctx.begin(), end = ctx.end(); |
3039 | if (begin == end) return begin; |
3040 | using handler_type = detail::dynamic_specs_handler<ParseContext>; |
3041 | auto type = detail::type_constant<T, Char>::value; |
3042 | auto checker = |
3043 | detail::specs_checker<handler_type>(handler_type(specs_, ctx), type); |
3044 | auto it = detail::parse_format_specs(begin, end, checker); |
3045 | auto eh = ctx.error_handler(); |
3046 | switch (type) { |
3047 | case detail::type::none_type: |
3048 | FMT_ASSERT(false, "invalid argument type" ); |
3049 | break; |
3050 | case detail::type::bool_type: |
3051 | if (specs_.type == presentation_type::none || |
3052 | specs_.type == presentation_type::string) { |
3053 | break; |
3054 | } |
3055 | FMT_FALLTHROUGH; |
3056 | case detail::type::int_type: |
3057 | case detail::type::uint_type: |
3058 | case detail::type::long_long_type: |
3059 | case detail::type::ulong_long_type: |
3060 | case detail::type::int128_type: |
3061 | case detail::type::uint128_type: |
3062 | detail::check_int_type_spec(specs_.type, eh); |
3063 | break; |
3064 | case detail::type::char_type: |
3065 | detail::check_char_specs(specs_, eh); |
3066 | break; |
3067 | case detail::type::float_type: |
3068 | if (detail::const_check(FMT_USE_FLOAT)) |
3069 | detail::parse_float_type_spec(specs_, eh); |
3070 | else |
3071 | FMT_ASSERT(false, "float support disabled" ); |
3072 | break; |
3073 | case detail::type::double_type: |
3074 | if (detail::const_check(FMT_USE_DOUBLE)) |
3075 | detail::parse_float_type_spec(specs_, eh); |
3076 | else |
3077 | FMT_ASSERT(false, "double support disabled" ); |
3078 | break; |
3079 | case detail::type::long_double_type: |
3080 | if (detail::const_check(FMT_USE_LONG_DOUBLE)) |
3081 | detail::parse_float_type_spec(specs_, eh); |
3082 | else |
3083 | FMT_ASSERT(false, "long double support disabled" ); |
3084 | break; |
3085 | case detail::type::cstring_type: |
3086 | detail::check_cstring_type_spec(specs_.type, eh); |
3087 | break; |
3088 | case detail::type::string_type: |
3089 | detail::check_string_type_spec(specs_.type, eh); |
3090 | break; |
3091 | case detail::type::pointer_type: |
3092 | detail::check_pointer_type_spec(specs_.type, eh); |
3093 | break; |
3094 | case detail::type::custom_type: |
3095 | // Custom format specifiers are checked in parse functions of |
3096 | // formatter specializations. |
3097 | break; |
3098 | } |
3099 | return it; |
3100 | } |
3101 | |
3102 | template <detail::type U = detail::type_constant<T, Char>::value, |
3103 | enable_if_t<(U == detail::type::string_type || |
3104 | U == detail::type::cstring_type || |
3105 | U == detail::type::char_type), |
3106 | int> = 0> |
3107 | FMT_CONSTEXPR void set_debug_format() { |
3108 | specs_.type = presentation_type::debug; |
3109 | } |
3110 | |
3111 | template <typename FormatContext> |
3112 | FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const |
3113 | -> decltype(ctx.out()); |
3114 | }; |
3115 | |
3116 | #define FMT_FORMAT_AS(Type, Base) \ |
3117 | template <typename Char> \ |
3118 | struct formatter<Type, Char> : formatter<Base, Char> { \ |
3119 | template <typename FormatContext> \ |
3120 | auto format(Type const& val, FormatContext& ctx) const \ |
3121 | -> decltype(ctx.out()) { \ |
3122 | return formatter<Base, Char>::format(static_cast<Base>(val), ctx); \ |
3123 | } \ |
3124 | } |
3125 | |
3126 | FMT_FORMAT_AS(signed char, int); |
3127 | FMT_FORMAT_AS(unsigned char, unsigned); |
3128 | FMT_FORMAT_AS(short, int); |
3129 | FMT_FORMAT_AS(unsigned short, unsigned); |
3130 | FMT_FORMAT_AS(long, long long); |
3131 | FMT_FORMAT_AS(unsigned long, unsigned long long); |
3132 | FMT_FORMAT_AS(Char*, const Char*); |
3133 | FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>); |
3134 | FMT_FORMAT_AS(std::nullptr_t, const void*); |
3135 | FMT_FORMAT_AS(detail::std_string_view<Char>, basic_string_view<Char>); |
3136 | |
3137 | template <typename Char> struct basic_runtime { basic_string_view<Char> str; }; |
3138 | |
3139 | /** A compile-time format string. */ |
3140 | template <typename Char, typename... Args> class basic_format_string { |
3141 | private: |
3142 | basic_string_view<Char> str_; |
3143 | |
3144 | public: |
3145 | template <typename S, |
3146 | FMT_ENABLE_IF( |
3147 | std::is_convertible<const S&, basic_string_view<Char>>::value)> |
3148 | FMT_CONSTEVAL FMT_INLINE basic_format_string(const S& s) : str_(s) { |
3149 | static_assert( |
3150 | detail::count< |
3151 | (std::is_base_of<detail::view, remove_reference_t<Args>>::value && |
3152 | std::is_reference<Args>::value)...>() == 0, |
3153 | "passing views as lvalues is disallowed" ); |
3154 | #ifdef FMT_HAS_CONSTEVAL |
3155 | if constexpr (detail::count_named_args<Args...>() == |
3156 | detail::count_statically_named_args<Args...>()) { |
3157 | using checker = detail::format_string_checker<Char, detail::error_handler, |
3158 | remove_cvref_t<Args>...>; |
3159 | detail::parse_format_string<true>(str_, checker(s, {})); |
3160 | } |
3161 | #else |
3162 | detail::check_format_string<Args...>(s); |
3163 | #endif |
3164 | } |
3165 | basic_format_string(basic_runtime<Char> r) : str_(r.str) {} |
3166 | |
3167 | FMT_INLINE operator basic_string_view<Char>() const { return str_; } |
3168 | }; |
3169 | |
3170 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
3171 | // Workaround broken conversion on older gcc. |
3172 | template <typename...> using format_string = string_view; |
3173 | inline auto runtime(string_view s) -> string_view { return s; } |
3174 | #else |
3175 | template <typename... Args> |
3176 | using format_string = basic_format_string<char, type_identity_t<Args>...>; |
3177 | /** |
3178 | \rst |
3179 | Creates a runtime format string. |
3180 | |
3181 | **Example**:: |
3182 | |
3183 | // Check format string at runtime instead of compile-time. |
3184 | fmt::print(fmt::runtime("{:d}"), "I am not a number"); |
3185 | \endrst |
3186 | */ |
3187 | inline auto runtime(string_view s) -> basic_runtime<char> { return {{s}}; } |
3188 | #endif |
3189 | |
3190 | FMT_API auto vformat(string_view fmt, format_args args) -> std::string; |
3191 | |
3192 | /** |
3193 | \rst |
3194 | Formats ``args`` according to specifications in ``fmt`` and returns the result |
3195 | as a string. |
3196 | |
3197 | **Example**:: |
3198 | |
3199 | #include <fmt/core.h> |
3200 | std::string message = fmt::format("The answer is {}.", 42); |
3201 | \endrst |
3202 | */ |
3203 | template <typename... T> |
3204 | FMT_NODISCARD FMT_INLINE auto format(format_string<T...> fmt, T&&... args) |
3205 | -> std::string { |
3206 | return vformat(fmt, fmt::make_format_args(args...)); |
3207 | } |
3208 | |
3209 | /** Formats a string and writes the output to ``out``. */ |
3210 | template <typename OutputIt, |
3211 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3212 | auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt { |
3213 | using detail::get_buffer; |
3214 | auto&& buf = get_buffer<char>(out); |
3215 | detail::vformat_to(buf, fmt, args, {}); |
3216 | return detail::get_iterator(buf); |
3217 | } |
3218 | |
3219 | /** |
3220 | \rst |
3221 | Formats ``args`` according to specifications in ``fmt``, writes the result to |
3222 | the output iterator ``out`` and returns the iterator past the end of the output |
3223 | range. `format_to` does not append a terminating null character. |
3224 | |
3225 | **Example**:: |
3226 | |
3227 | auto out = std::vector<char>(); |
3228 | fmt::format_to(std::back_inserter(out), "{}", 42); |
3229 | \endrst |
3230 | */ |
3231 | template <typename OutputIt, typename... T, |
3232 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3233 | FMT_INLINE auto format_to(OutputIt out, format_string<T...> fmt, T&&... args) |
3234 | -> OutputIt { |
3235 | return vformat_to(out, fmt, fmt::make_format_args(args...)); |
3236 | } |
3237 | |
3238 | template <typename OutputIt> struct format_to_n_result { |
3239 | /** Iterator past the end of the output range. */ |
3240 | OutputIt out; |
3241 | /** Total (not truncated) output size. */ |
3242 | size_t size; |
3243 | }; |
3244 | |
3245 | template <typename OutputIt, typename... T, |
3246 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3247 | auto vformat_to_n(OutputIt out, size_t n, string_view fmt, format_args args) |
3248 | -> format_to_n_result<OutputIt> { |
3249 | using traits = detail::fixed_buffer_traits; |
3250 | auto buf = detail::iterator_buffer<OutputIt, char, traits>(out, n); |
3251 | detail::vformat_to(buf, fmt, args, {}); |
3252 | return {buf.out(), buf.count()}; |
3253 | } |
3254 | |
3255 | /** |
3256 | \rst |
3257 | Formats ``args`` according to specifications in ``fmt``, writes up to ``n`` |
3258 | characters of the result to the output iterator ``out`` and returns the total |
3259 | (not truncated) output size and the iterator past the end of the output range. |
3260 | `format_to_n` does not append a terminating null character. |
3261 | \endrst |
3262 | */ |
3263 | template <typename OutputIt, typename... T, |
3264 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3265 | FMT_INLINE auto format_to_n(OutputIt out, size_t n, format_string<T...> fmt, |
3266 | T&&... args) -> format_to_n_result<OutputIt> { |
3267 | return vformat_to_n(out, n, fmt, fmt::make_format_args(args...)); |
3268 | } |
3269 | |
3270 | /** Returns the number of chars in the output of ``format(fmt, args...)``. */ |
3271 | template <typename... T> |
3272 | FMT_NODISCARD FMT_INLINE auto formatted_size(format_string<T...> fmt, |
3273 | T&&... args) -> size_t { |
3274 | auto buf = detail::counting_buffer<>(); |
3275 | detail::vformat_to(buf, string_view(fmt), fmt::make_format_args(args...), {}); |
3276 | return buf.count(); |
3277 | } |
3278 | |
3279 | FMT_API void vprint(string_view fmt, format_args args); |
3280 | FMT_API void vprint(std::FILE* f, string_view fmt, format_args args); |
3281 | |
3282 | /** |
3283 | \rst |
3284 | Formats ``args`` according to specifications in ``fmt`` and writes the output |
3285 | to ``stdout``. |
3286 | |
3287 | **Example**:: |
3288 | |
3289 | fmt::print("Elapsed time: {0:.2f} seconds", 1.23); |
3290 | \endrst |
3291 | */ |
3292 | template <typename... T> |
3293 | FMT_INLINE void print(format_string<T...> fmt, T&&... args) { |
3294 | const auto& vargs = fmt::make_format_args(args...); |
3295 | return detail::is_utf8() ? vprint(fmt, vargs) |
3296 | : detail::vprint_mojibake(stdout, fmt, vargs); |
3297 | } |
3298 | |
3299 | /** |
3300 | \rst |
3301 | Formats ``args`` according to specifications in ``fmt`` and writes the |
3302 | output to the file ``f``. |
3303 | |
3304 | **Example**:: |
3305 | |
3306 | fmt::print(stderr, "Don't {}!", "panic"); |
3307 | \endrst |
3308 | */ |
3309 | template <typename... T> |
3310 | FMT_INLINE void print(std::FILE* f, format_string<T...> fmt, T&&... args) { |
3311 | const auto& vargs = fmt::make_format_args(args...); |
3312 | return detail::is_utf8() ? vprint(f, fmt, vargs) |
3313 | : detail::vprint_mojibake(f, fmt, vargs); |
3314 | } |
3315 | |
3316 | FMT_MODULE_EXPORT_END |
3317 | FMT_GCC_PRAGMA("GCC pop_options" ) |
3318 | FMT_END_NAMESPACE |
3319 | |
3320 | #ifdef FMT_HEADER_ONLY |
3321 | # include "format.h" |
3322 | #endif |
3323 | #endif // FMT_CORE_H_ |
3324 | |