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 90101 |
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 || FMT_MSC_VERSION > 1900 |
73 | # define FMT_HAS_INCLUDE(x) __has_include(x) |
74 | #else |
75 | # define FMT_HAS_INCLUDE(x) 0 |
76 | #endif |
77 | |
78 | #ifdef __has_cpp_attribute |
79 | # define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) |
80 | #else |
81 | # define FMT_HAS_CPP_ATTRIBUTE(x) 0 |
82 | #endif |
83 | |
84 | #define FMT_HAS_CPP14_ATTRIBUTE(attribute) \ |
85 | (FMT_CPLUSPLUS >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute)) |
86 | |
87 | #define FMT_HAS_CPP17_ATTRIBUTE(attribute) \ |
88 | (FMT_CPLUSPLUS >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute)) |
89 | |
90 | // Check if relaxed C++14 constexpr is supported. |
91 | // GCC doesn't allow throw in constexpr until version 6 (bug 67371). |
92 | #ifndef FMT_USE_CONSTEXPR |
93 | # if (FMT_HAS_FEATURE(cxx_relaxed_constexpr) || FMT_MSC_VERSION >= 1912 || \ |
94 | (FMT_GCC_VERSION >= 600 && FMT_CPLUSPLUS >= 201402L)) && \ |
95 | !FMT_ICC_VERSION && !defined(__NVCC__) |
96 | # define FMT_USE_CONSTEXPR 1 |
97 | # else |
98 | # define FMT_USE_CONSTEXPR 0 |
99 | # endif |
100 | #endif |
101 | #if FMT_USE_CONSTEXPR |
102 | # define FMT_CONSTEXPR constexpr |
103 | #else |
104 | # define FMT_CONSTEXPR |
105 | #endif |
106 | |
107 | #if ((FMT_CPLUSPLUS >= 202002L) && \ |
108 | (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9)) || \ |
109 | (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002) |
110 | # define FMT_CONSTEXPR20 constexpr |
111 | #else |
112 | # define FMT_CONSTEXPR20 |
113 | #endif |
114 | |
115 | // Check if constexpr std::char_traits<>::{compare,length} are supported. |
116 | #if defined(__GLIBCXX__) |
117 | # if FMT_CPLUSPLUS >= 201703L && defined(_GLIBCXX_RELEASE) && \ |
118 | _GLIBCXX_RELEASE >= 7 // GCC 7+ libstdc++ has _GLIBCXX_RELEASE. |
119 | # define FMT_CONSTEXPR_CHAR_TRAITS constexpr |
120 | # endif |
121 | #elif defined(_LIBCPP_VERSION) && FMT_CPLUSPLUS >= 201703L && \ |
122 | _LIBCPP_VERSION >= 4000 |
123 | # define FMT_CONSTEXPR_CHAR_TRAITS constexpr |
124 | #elif FMT_MSC_VERSION >= 1914 && FMT_CPLUSPLUS >= 201703L |
125 | # define FMT_CONSTEXPR_CHAR_TRAITS constexpr |
126 | #endif |
127 | #ifndef FMT_CONSTEXPR_CHAR_TRAITS |
128 | # define FMT_CONSTEXPR_CHAR_TRAITS |
129 | #endif |
130 | |
131 | // Check if exceptions are disabled. |
132 | #ifndef FMT_EXCEPTIONS |
133 | # if (defined(__GNUC__) && !defined(__EXCEPTIONS)) || \ |
134 | (FMT_MSC_VERSION && !_HAS_EXCEPTIONS) |
135 | # define FMT_EXCEPTIONS 0 |
136 | # else |
137 | # define FMT_EXCEPTIONS 1 |
138 | # endif |
139 | #endif |
140 | |
141 | #ifndef FMT_DEPRECATED |
142 | # if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VERSION >= 1900 |
143 | # define FMT_DEPRECATED [[deprecated]] |
144 | # else |
145 | # if (defined(__GNUC__) && !defined(__LCC__)) || defined(__clang__) |
146 | # define FMT_DEPRECATED __attribute__((deprecated)) |
147 | # elif FMT_MSC_VERSION |
148 | # define FMT_DEPRECATED __declspec(deprecated) |
149 | # else |
150 | # define FMT_DEPRECATED /* deprecated */ |
151 | # endif |
152 | # endif |
153 | #endif |
154 | |
155 | // [[noreturn]] is disabled on MSVC and NVCC because of bogus unreachable code |
156 | // warnings. |
157 | #if FMT_EXCEPTIONS && FMT_HAS_CPP_ATTRIBUTE(noreturn) && !FMT_MSC_VERSION && \ |
158 | !defined(__NVCC__) |
159 | # define FMT_NORETURN [[noreturn]] |
160 | #else |
161 | # define FMT_NORETURN |
162 | #endif |
163 | |
164 | #if FMT_HAS_CPP17_ATTRIBUTE(fallthrough) |
165 | # define FMT_FALLTHROUGH [[fallthrough]] |
166 | #elif defined(__clang__) |
167 | # define FMT_FALLTHROUGH [[clang::fallthrough]] |
168 | #elif FMT_GCC_VERSION >= 700 && \ |
169 | (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= 520) |
170 | # define FMT_FALLTHROUGH [[gnu::fallthrough]] |
171 | #else |
172 | # define FMT_FALLTHROUGH |
173 | #endif |
174 | |
175 | #ifndef FMT_NODISCARD |
176 | # if FMT_HAS_CPP17_ATTRIBUTE(nodiscard) |
177 | # define FMT_NODISCARD [[nodiscard]] |
178 | # else |
179 | # define FMT_NODISCARD |
180 | # endif |
181 | #endif |
182 | |
183 | #ifndef FMT_USE_FLOAT |
184 | # define FMT_USE_FLOAT 1 |
185 | #endif |
186 | #ifndef FMT_USE_DOUBLE |
187 | # define FMT_USE_DOUBLE 1 |
188 | #endif |
189 | #ifndef FMT_USE_LONG_DOUBLE |
190 | # define FMT_USE_LONG_DOUBLE 1 |
191 | #endif |
192 | |
193 | #ifndef FMT_INLINE |
194 | # if FMT_GCC_VERSION || FMT_CLANG_VERSION |
195 | # define FMT_INLINE inline __attribute__((always_inline)) |
196 | # else |
197 | # define FMT_INLINE inline |
198 | # endif |
199 | #endif |
200 | |
201 | // An inline std::forward replacement. |
202 | #define FMT_FORWARD(...) static_cast<decltype(__VA_ARGS__)&&>(__VA_ARGS__) |
203 | |
204 | #ifdef _MSC_VER |
205 | # define FMT_UNCHECKED_ITERATOR(It) \ |
206 | using _Unchecked_type = It // Mark iterator as checked. |
207 | #else |
208 | # define FMT_UNCHECKED_ITERATOR(It) using unchecked_type = It |
209 | #endif |
210 | |
211 | #ifndef FMT_BEGIN_NAMESPACE |
212 | # define FMT_BEGIN_NAMESPACE \ |
213 | namespace fmt { \ |
214 | inline namespace v9 { |
215 | # define FMT_END_NAMESPACE \ |
216 | } \ |
217 | } |
218 | #endif |
219 | |
220 | #ifndef FMT_MODULE_EXPORT |
221 | # define FMT_MODULE_EXPORT |
222 | # define FMT_MODULE_EXPORT_BEGIN |
223 | # define FMT_MODULE_EXPORT_END |
224 | # define FMT_BEGIN_DETAIL_NAMESPACE namespace detail { |
225 | # define FMT_END_DETAIL_NAMESPACE } |
226 | #endif |
227 | |
228 | #if !defined(FMT_HEADER_ONLY) && defined(_WIN32) |
229 | # define FMT_CLASS_API FMT_MSC_WARNING(suppress : 4275) |
230 | # ifdef FMT_EXPORT |
231 | # define FMT_API __declspec(dllexport) |
232 | # elif defined(FMT_SHARED) |
233 | # define FMT_API __declspec(dllimport) |
234 | # endif |
235 | #else |
236 | # define FMT_CLASS_API |
237 | # if defined(FMT_EXPORT) || defined(FMT_SHARED) |
238 | # if defined(__GNUC__) || defined(__clang__) |
239 | # define FMT_API __attribute__((visibility("default"))) |
240 | # endif |
241 | # endif |
242 | #endif |
243 | #ifndef FMT_API |
244 | # define FMT_API |
245 | #endif |
246 | |
247 | // libc++ supports string_view in pre-c++17. |
248 | #if FMT_HAS_INCLUDE(<string_view>) && \ |
249 | (FMT_CPLUSPLUS >= 201703L || defined(_LIBCPP_VERSION)) |
250 | # include <string_view> |
251 | # define FMT_USE_STRING_VIEW |
252 | #elif FMT_HAS_INCLUDE("experimental/string_view") && FMT_CPLUSPLUS >= 201402L |
253 | # include <experimental/string_view> |
254 | # define FMT_USE_EXPERIMENTAL_STRING_VIEW |
255 | #endif |
256 | |
257 | #ifndef FMT_UNICODE |
258 | # define FMT_UNICODE !FMT_MSC_VERSION |
259 | #endif |
260 | |
261 | #ifndef FMT_CONSTEVAL |
262 | # if ((FMT_GCC_VERSION >= 1000 || FMT_CLANG_VERSION >= 1101) && \ |
263 | FMT_CPLUSPLUS >= 202002L && !defined(__apple_build_version__)) || \ |
264 | (defined(__cpp_consteval) && \ |
265 | (!FMT_MSC_VERSION || _MSC_FULL_VER >= 193030704)) |
266 | // consteval is broken in MSVC before VS2022 and Apple clang 13. |
267 | # define FMT_CONSTEVAL consteval |
268 | # define FMT_HAS_CONSTEVAL |
269 | # else |
270 | # define FMT_CONSTEVAL |
271 | # endif |
272 | #endif |
273 | |
274 | #ifndef FMT_USE_NONTYPE_TEMPLATE_ARGS |
275 | # if defined(__cpp_nontype_template_args) && \ |
276 | ((FMT_GCC_VERSION >= 903 && FMT_CPLUSPLUS >= 201709L) || \ |
277 | __cpp_nontype_template_args >= 201911L) && \ |
278 | !defined(__NVCOMPILER) && !defined(__LCC__) |
279 | # define FMT_USE_NONTYPE_TEMPLATE_ARGS 1 |
280 | # else |
281 | # define FMT_USE_NONTYPE_TEMPLATE_ARGS 0 |
282 | # endif |
283 | #endif |
284 | |
285 | // Enable minimal optimizations for more compact code in debug mode. |
286 | FMT_GCC_PRAGMA("GCC push_options" ) |
287 | #if !defined(__OPTIMIZE__) && !defined(__NVCOMPILER) && !defined(__LCC__) |
288 | FMT_GCC_PRAGMA("GCC optimize(\"Og\")" ) |
289 | #endif |
290 | |
291 | FMT_BEGIN_NAMESPACE |
292 | FMT_MODULE_EXPORT_BEGIN |
293 | |
294 | // Implementations of enable_if_t and other metafunctions for older systems. |
295 | template <bool B, typename T = void> |
296 | using enable_if_t = typename std::enable_if<B, T>::type; |
297 | template <bool B, typename T, typename F> |
298 | using conditional_t = typename std::conditional<B, T, F>::type; |
299 | template <bool B> using bool_constant = std::integral_constant<bool, B>; |
300 | template <typename T> |
301 | using remove_reference_t = typename std::remove_reference<T>::type; |
302 | template <typename T> |
303 | using remove_const_t = typename std::remove_const<T>::type; |
304 | template <typename T> |
305 | using remove_cvref_t = typename std::remove_cv<remove_reference_t<T>>::type; |
306 | template <typename T> struct type_identity { using type = T; }; |
307 | template <typename T> using type_identity_t = typename type_identity<T>::type; |
308 | template <typename T> |
309 | using underlying_t = typename std::underlying_type<T>::type; |
310 | |
311 | template <typename...> struct disjunction : std::false_type {}; |
312 | template <typename P> struct disjunction<P> : P {}; |
313 | template <typename P1, typename... Pn> |
314 | struct disjunction<P1, Pn...> |
315 | : conditional_t<bool(P1::value), P1, disjunction<Pn...>> {}; |
316 | |
317 | template <typename...> struct conjunction : std::true_type {}; |
318 | template <typename P> struct conjunction<P> : P {}; |
319 | template <typename P1, typename... Pn> |
320 | struct conjunction<P1, Pn...> |
321 | : conditional_t<bool(P1::value), conjunction<Pn...>, P1> {}; |
322 | |
323 | struct monostate { |
324 | constexpr monostate() {} |
325 | }; |
326 | |
327 | // An enable_if helper to be used in template parameters which results in much |
328 | // shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed |
329 | // to workaround a bug in MSVC 2019 (see #1140 and #1186). |
330 | #ifdef FMT_DOC |
331 | # define FMT_ENABLE_IF(...) |
332 | #else |
333 | # define FMT_ENABLE_IF(...) fmt::enable_if_t<(__VA_ARGS__), int> = 0 |
334 | #endif |
335 | |
336 | FMT_BEGIN_DETAIL_NAMESPACE |
337 | |
338 | // Suppresses "unused variable" warnings with the method described in |
339 | // https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/. |
340 | // (void)var does not work on many Intel compilers. |
341 | template <typename... T> FMT_CONSTEXPR void ignore_unused(const T&...) {} |
342 | |
343 | constexpr FMT_INLINE auto is_constant_evaluated( |
344 | bool default_value = false) noexcept -> bool { |
345 | #ifdef __cpp_lib_is_constant_evaluated |
346 | ignore_unused(default_value); |
347 | return std::is_constant_evaluated(); |
348 | #else |
349 | return default_value; |
350 | #endif |
351 | } |
352 | |
353 | // Suppresses "conditional expression is constant" warnings. |
354 | template <typename T> constexpr FMT_INLINE auto const_check(T value) -> T { |
355 | return value; |
356 | } |
357 | |
358 | FMT_NORETURN FMT_API void assert_fail(const char* file, int line, |
359 | const char* message); |
360 | |
361 | #ifndef FMT_ASSERT |
362 | # ifdef NDEBUG |
363 | // FMT_ASSERT is not empty to avoid -Wempty-body. |
364 | # define FMT_ASSERT(condition, message) \ |
365 | ::fmt::detail::ignore_unused((condition), (message)) |
366 | # else |
367 | # define FMT_ASSERT(condition, message) \ |
368 | ((condition) /* void() fails with -Winvalid-constexpr on clang 4.0.1 */ \ |
369 | ? (void)0 \ |
370 | : ::fmt::detail::assert_fail(__FILE__, __LINE__, (message))) |
371 | # endif |
372 | #endif |
373 | |
374 | #if defined(FMT_USE_STRING_VIEW) |
375 | template <typename Char> using std_string_view = std::basic_string_view<Char>; |
376 | #elif defined(FMT_USE_EXPERIMENTAL_STRING_VIEW) |
377 | template <typename Char> |
378 | using std_string_view = std::experimental::basic_string_view<Char>; |
379 | #else |
380 | template <typename T> struct std_string_view {}; |
381 | #endif |
382 | |
383 | #ifdef FMT_USE_INT128 |
384 | // Do nothing. |
385 | #elif defined(__SIZEOF_INT128__) && !defined(__NVCC__) && \ |
386 | !(FMT_CLANG_VERSION && FMT_MSC_VERSION) |
387 | # define FMT_USE_INT128 1 |
388 | using int128_opt = __int128_t; // An optional native 128-bit integer. |
389 | using uint128_opt = __uint128_t; |
390 | template <typename T> inline auto convert_for_visit(T value) -> T { |
391 | return value; |
392 | } |
393 | #else |
394 | # define FMT_USE_INT128 0 |
395 | #endif |
396 | #if !FMT_USE_INT128 |
397 | enum class int128_opt {}; |
398 | enum class uint128_opt {}; |
399 | // Reduce template instantiations. |
400 | template <typename T> auto convert_for_visit(T) -> monostate { return {}; } |
401 | #endif |
402 | |
403 | // Casts a nonnegative integer to unsigned. |
404 | template <typename Int> |
405 | FMT_CONSTEXPR auto to_unsigned(Int value) -> |
406 | typename std::make_unsigned<Int>::type { |
407 | FMT_ASSERT(std::is_unsigned<Int>::value || value >= 0, "negative value" ); |
408 | return static_cast<typename std::make_unsigned<Int>::type>(value); |
409 | } |
410 | |
411 | FMT_MSC_WARNING(suppress : 4566) constexpr unsigned char micro[] = "\u00B5" ; |
412 | |
413 | constexpr auto is_utf8() -> bool { |
414 | // Avoid buggy sign extensions in MSVC's constant evaluation mode (#2297). |
415 | using uchar = unsigned char; |
416 | return FMT_UNICODE || (sizeof(micro) == 3 && uchar(micro[0]) == 0xC2 && |
417 | uchar(micro[1]) == 0xB5); |
418 | } |
419 | FMT_END_DETAIL_NAMESPACE |
420 | |
421 | /** |
422 | An implementation of ``std::basic_string_view`` for pre-C++17. It provides a |
423 | subset of the API. ``fmt::basic_string_view`` is used for format strings even |
424 | if ``std::string_view`` is available to prevent issues when a library is |
425 | compiled with a different ``-std`` option than the client code (which is not |
426 | recommended). |
427 | */ |
428 | template <typename Char> class basic_string_view { |
429 | private: |
430 | const Char* data_; |
431 | size_t size_; |
432 | |
433 | public: |
434 | using value_type = Char; |
435 | using iterator = const Char*; |
436 | |
437 | constexpr basic_string_view() noexcept : data_(nullptr), size_(0) {} |
438 | |
439 | /** Constructs a string reference object from a C string and a size. */ |
440 | constexpr basic_string_view(const Char* s, size_t count) noexcept |
441 | : data_(s), size_(count) {} |
442 | |
443 | /** |
444 | \rst |
445 | Constructs a string reference object from a C string computing |
446 | the size with ``std::char_traits<Char>::length``. |
447 | \endrst |
448 | */ |
449 | FMT_CONSTEXPR_CHAR_TRAITS |
450 | FMT_INLINE |
451 | basic_string_view(const Char* s) |
452 | : data_(s), |
453 | size_(detail::const_check(std::is_same<Char, char>::value && |
454 | !detail::is_constant_evaluated(true)) |
455 | ? std::strlen(reinterpret_cast<const char*>(s)) |
456 | : std::char_traits<Char>::length(s)) {} |
457 | |
458 | /** Constructs a string reference from a ``std::basic_string`` object. */ |
459 | template <typename Traits, typename Alloc> |
460 | FMT_CONSTEXPR basic_string_view( |
461 | const std::basic_string<Char, Traits, Alloc>& s) noexcept |
462 | : data_(s.data()), size_(s.size()) {} |
463 | |
464 | template <typename S, FMT_ENABLE_IF(std::is_same< |
465 | S, detail::std_string_view<Char>>::value)> |
466 | FMT_CONSTEXPR basic_string_view(S s) noexcept |
467 | : data_(s.data()), size_(s.size()) {} |
468 | |
469 | /** Returns a pointer to the string data. */ |
470 | constexpr auto data() const noexcept -> const Char* { return data_; } |
471 | |
472 | /** Returns the string size. */ |
473 | constexpr auto size() const noexcept -> size_t { return size_; } |
474 | |
475 | constexpr auto begin() const noexcept -> iterator { return data_; } |
476 | constexpr auto end() const noexcept -> iterator { return data_ + size_; } |
477 | |
478 | constexpr auto operator[](size_t pos) const noexcept -> const Char& { |
479 | return data_[pos]; |
480 | } |
481 | |
482 | FMT_CONSTEXPR void remove_prefix(size_t n) noexcept { |
483 | data_ += n; |
484 | size_ -= n; |
485 | } |
486 | |
487 | FMT_CONSTEXPR_CHAR_TRAITS bool starts_with( |
488 | basic_string_view<Char> sv) const noexcept { |
489 | return size_ >= sv.size_ && |
490 | std::char_traits<Char>::compare(data_, sv.data_, sv.size_) == 0; |
491 | } |
492 | FMT_CONSTEXPR_CHAR_TRAITS bool starts_with(Char c) const noexcept { |
493 | return size_ >= 1 && std::char_traits<Char>::eq(*data_, c); |
494 | } |
495 | FMT_CONSTEXPR_CHAR_TRAITS bool starts_with(const Char* s) const { |
496 | return starts_with(basic_string_view<Char>(s)); |
497 | } |
498 | |
499 | // Lexicographically compare this string reference to other. |
500 | FMT_CONSTEXPR_CHAR_TRAITS auto compare(basic_string_view other) const -> int { |
501 | size_t str_size = size_ < other.size_ ? size_ : other.size_; |
502 | int result = std::char_traits<Char>::compare(data_, other.data_, str_size); |
503 | if (result == 0) |
504 | result = size_ == other.size_ ? 0 : (size_ < other.size_ ? -1 : 1); |
505 | return result; |
506 | } |
507 | |
508 | FMT_CONSTEXPR_CHAR_TRAITS friend auto operator==(basic_string_view lhs, |
509 | basic_string_view rhs) |
510 | -> bool { |
511 | return lhs.compare(rhs) == 0; |
512 | } |
513 | friend auto operator!=(basic_string_view lhs, basic_string_view rhs) -> bool { |
514 | return lhs.compare(rhs) != 0; |
515 | } |
516 | friend auto operator<(basic_string_view lhs, basic_string_view rhs) -> bool { |
517 | return lhs.compare(rhs) < 0; |
518 | } |
519 | friend auto operator<=(basic_string_view lhs, basic_string_view rhs) -> bool { |
520 | return lhs.compare(rhs) <= 0; |
521 | } |
522 | friend auto operator>(basic_string_view lhs, basic_string_view rhs) -> bool { |
523 | return lhs.compare(rhs) > 0; |
524 | } |
525 | friend auto operator>=(basic_string_view lhs, basic_string_view rhs) -> bool { |
526 | return lhs.compare(rhs) >= 0; |
527 | } |
528 | }; |
529 | |
530 | using string_view = basic_string_view<char>; |
531 | |
532 | /** Specifies if ``T`` is a character type. Can be specialized by users. */ |
533 | template <typename T> struct is_char : std::false_type {}; |
534 | template <> struct is_char<char> : std::true_type {}; |
535 | |
536 | FMT_BEGIN_DETAIL_NAMESPACE |
537 | |
538 | // A base class for compile-time strings. |
539 | struct compile_string {}; |
540 | |
541 | template <typename S> |
542 | struct is_compile_string : std::is_base_of<compile_string, S> {}; |
543 | |
544 | // Returns a string view of `s`. |
545 | template <typename Char, FMT_ENABLE_IF(is_char<Char>::value)> |
546 | FMT_INLINE auto to_string_view(const Char* s) -> basic_string_view<Char> { |
547 | return s; |
548 | } |
549 | template <typename Char, typename Traits, typename Alloc> |
550 | inline auto to_string_view(const std::basic_string<Char, Traits, Alloc>& s) |
551 | -> basic_string_view<Char> { |
552 | return s; |
553 | } |
554 | template <typename Char> |
555 | constexpr auto to_string_view(basic_string_view<Char> s) |
556 | -> basic_string_view<Char> { |
557 | return s; |
558 | } |
559 | template <typename Char, |
560 | FMT_ENABLE_IF(!std::is_empty<std_string_view<Char>>::value)> |
561 | inline auto to_string_view(std_string_view<Char> s) -> basic_string_view<Char> { |
562 | return s; |
563 | } |
564 | template <typename S, FMT_ENABLE_IF(is_compile_string<S>::value)> |
565 | constexpr auto to_string_view(const S& s) |
566 | -> basic_string_view<typename S::char_type> { |
567 | return basic_string_view<typename S::char_type>(s); |
568 | } |
569 | void to_string_view(...); |
570 | |
571 | // Specifies whether S is a string type convertible to fmt::basic_string_view. |
572 | // It should be a constexpr function but MSVC 2017 fails to compile it in |
573 | // enable_if and MSVC 2015 fails to compile it as an alias template. |
574 | // ADL invocation of to_string_view is DEPRECATED! |
575 | template <typename S> |
576 | struct is_string : std::is_class<decltype(to_string_view(std::declval<S>()))> { |
577 | }; |
578 | |
579 | template <typename S, typename = void> struct char_t_impl {}; |
580 | template <typename S> struct char_t_impl<S, enable_if_t<is_string<S>::value>> { |
581 | using result = decltype(to_string_view(std::declval<S>())); |
582 | using type = typename result::value_type; |
583 | }; |
584 | |
585 | enum class type { |
586 | none_type, |
587 | // Integer types should go first, |
588 | int_type, |
589 | uint_type, |
590 | long_long_type, |
591 | ulong_long_type, |
592 | int128_type, |
593 | uint128_type, |
594 | bool_type, |
595 | char_type, |
596 | last_integer_type = char_type, |
597 | // followed by floating-point types. |
598 | float_type, |
599 | double_type, |
600 | long_double_type, |
601 | last_numeric_type = long_double_type, |
602 | cstring_type, |
603 | string_type, |
604 | pointer_type, |
605 | custom_type |
606 | }; |
607 | |
608 | // Maps core type T to the corresponding type enum constant. |
609 | template <typename T, typename Char> |
610 | struct type_constant : std::integral_constant<type, type::custom_type> {}; |
611 | |
612 | #define FMT_TYPE_CONSTANT(Type, constant) \ |
613 | template <typename Char> \ |
614 | struct type_constant<Type, Char> \ |
615 | : std::integral_constant<type, type::constant> {} |
616 | |
617 | FMT_TYPE_CONSTANT(int, int_type); |
618 | FMT_TYPE_CONSTANT(unsigned, uint_type); |
619 | FMT_TYPE_CONSTANT(long long, long_long_type); |
620 | FMT_TYPE_CONSTANT(unsigned long long, ulong_long_type); |
621 | FMT_TYPE_CONSTANT(int128_opt, int128_type); |
622 | FMT_TYPE_CONSTANT(uint128_opt, uint128_type); |
623 | FMT_TYPE_CONSTANT(bool, bool_type); |
624 | FMT_TYPE_CONSTANT(Char, char_type); |
625 | FMT_TYPE_CONSTANT(float, float_type); |
626 | FMT_TYPE_CONSTANT(double, double_type); |
627 | FMT_TYPE_CONSTANT(long double, long_double_type); |
628 | FMT_TYPE_CONSTANT(const Char*, cstring_type); |
629 | FMT_TYPE_CONSTANT(basic_string_view<Char>, string_type); |
630 | FMT_TYPE_CONSTANT(const void*, pointer_type); |
631 | |
632 | constexpr bool is_integral_type(type t) { |
633 | return t > type::none_type && t <= type::last_integer_type; |
634 | } |
635 | |
636 | constexpr bool is_arithmetic_type(type t) { |
637 | return t > type::none_type && t <= type::last_numeric_type; |
638 | } |
639 | |
640 | FMT_NORETURN FMT_API void throw_format_error(const char* message); |
641 | |
642 | struct error_handler { |
643 | constexpr error_handler() = default; |
644 | constexpr error_handler(const error_handler&) = default; |
645 | |
646 | // This function is intentionally not constexpr to give a compile-time error. |
647 | FMT_NORETURN void on_error(const char* message) { |
648 | throw_format_error(message); |
649 | } |
650 | }; |
651 | FMT_END_DETAIL_NAMESPACE |
652 | |
653 | /** String's character type. */ |
654 | template <typename S> using char_t = typename detail::char_t_impl<S>::type; |
655 | |
656 | /** |
657 | \rst |
658 | Parsing context consisting of a format string range being parsed and an |
659 | argument counter for automatic indexing. |
660 | You can use the ``format_parse_context`` type alias for ``char`` instead. |
661 | \endrst |
662 | */ |
663 | template <typename Char, typename ErrorHandler = detail::error_handler> |
664 | class basic_format_parse_context : private ErrorHandler { |
665 | private: |
666 | basic_string_view<Char> format_str_; |
667 | int next_arg_id_; |
668 | |
669 | FMT_CONSTEXPR void do_check_arg_id(int id); |
670 | |
671 | public: |
672 | using char_type = Char; |
673 | using iterator = typename basic_string_view<Char>::iterator; |
674 | |
675 | explicit constexpr basic_format_parse_context( |
676 | basic_string_view<Char> format_str, ErrorHandler eh = {}, |
677 | int next_arg_id = 0) |
678 | : ErrorHandler(eh), format_str_(format_str), next_arg_id_(next_arg_id) {} |
679 | |
680 | /** |
681 | Returns an iterator to the beginning of the format string range being |
682 | parsed. |
683 | */ |
684 | constexpr auto begin() const noexcept -> iterator { |
685 | return format_str_.begin(); |
686 | } |
687 | |
688 | /** |
689 | Returns an iterator past the end of the format string range being parsed. |
690 | */ |
691 | constexpr auto end() const noexcept -> iterator { return format_str_.end(); } |
692 | |
693 | /** Advances the begin iterator to ``it``. */ |
694 | FMT_CONSTEXPR void advance_to(iterator it) { |
695 | format_str_.remove_prefix(detail::to_unsigned(it - begin())); |
696 | } |
697 | |
698 | /** |
699 | Reports an error if using the manual argument indexing; otherwise returns |
700 | the next argument index and switches to the automatic indexing. |
701 | */ |
702 | FMT_CONSTEXPR auto next_arg_id() -> int { |
703 | if (next_arg_id_ < 0) { |
704 | on_error("cannot switch from manual to automatic argument indexing" ); |
705 | return 0; |
706 | } |
707 | int id = next_arg_id_++; |
708 | do_check_arg_id(id); |
709 | return id; |
710 | } |
711 | |
712 | /** |
713 | Reports an error if using the automatic argument indexing; otherwise |
714 | switches to the manual indexing. |
715 | */ |
716 | FMT_CONSTEXPR void check_arg_id(int id) { |
717 | if (next_arg_id_ > 0) { |
718 | on_error("cannot switch from automatic to manual argument indexing" ); |
719 | return; |
720 | } |
721 | next_arg_id_ = -1; |
722 | do_check_arg_id(id); |
723 | } |
724 | FMT_CONSTEXPR void check_arg_id(basic_string_view<Char>) {} |
725 | FMT_CONSTEXPR void check_dynamic_spec(int arg_id); |
726 | |
727 | FMT_CONSTEXPR void on_error(const char* message) { |
728 | ErrorHandler::on_error(message); |
729 | } |
730 | |
731 | constexpr auto error_handler() const -> ErrorHandler { return *this; } |
732 | }; |
733 | |
734 | using format_parse_context = basic_format_parse_context<char>; |
735 | |
736 | FMT_BEGIN_DETAIL_NAMESPACE |
737 | // A parse context with extra data used only in compile-time checks. |
738 | template <typename Char, typename ErrorHandler = detail::error_handler> |
739 | class compile_parse_context |
740 | : public basic_format_parse_context<Char, ErrorHandler> { |
741 | private: |
742 | int num_args_; |
743 | const type* types_; |
744 | using base = basic_format_parse_context<Char, ErrorHandler>; |
745 | |
746 | public: |
747 | explicit FMT_CONSTEXPR compile_parse_context( |
748 | basic_string_view<Char> format_str, int num_args, const type* types, |
749 | ErrorHandler eh = {}, int next_arg_id = 0) |
750 | : base(format_str, eh, next_arg_id), num_args_(num_args), types_(types) {} |
751 | |
752 | constexpr auto num_args() const -> int { return num_args_; } |
753 | constexpr auto arg_type(int id) const -> type { return types_[id]; } |
754 | |
755 | FMT_CONSTEXPR auto next_arg_id() -> int { |
756 | int id = base::next_arg_id(); |
757 | if (id >= num_args_) this->on_error("argument not found" ); |
758 | return id; |
759 | } |
760 | |
761 | FMT_CONSTEXPR void check_arg_id(int id) { |
762 | base::check_arg_id(id); |
763 | if (id >= num_args_) this->on_error("argument not found" ); |
764 | } |
765 | using base::check_arg_id; |
766 | |
767 | FMT_CONSTEXPR void check_dynamic_spec(int arg_id) { |
768 | detail::ignore_unused(arg_id); |
769 | #if !defined(__LCC__) |
770 | if (arg_id < num_args_ && types_ && !is_integral_type(types_[arg_id])) |
771 | this->on_error("width/precision is not integer" ); |
772 | #endif |
773 | } |
774 | }; |
775 | FMT_END_DETAIL_NAMESPACE |
776 | |
777 | template <typename Char, typename ErrorHandler> |
778 | FMT_CONSTEXPR void |
779 | basic_format_parse_context<Char, ErrorHandler>::do_check_arg_id(int id) { |
780 | // Argument id is only checked at compile-time during parsing because |
781 | // formatting has its own validation. |
782 | if (detail::is_constant_evaluated() && FMT_GCC_VERSION >= 1200) { |
783 | using context = detail::compile_parse_context<Char, ErrorHandler>; |
784 | if (id >= static_cast<context*>(this)->num_args()) |
785 | on_error("argument not found" ); |
786 | } |
787 | } |
788 | |
789 | template <typename Char, typename ErrorHandler> |
790 | FMT_CONSTEXPR void |
791 | basic_format_parse_context<Char, ErrorHandler>::check_dynamic_spec(int arg_id) { |
792 | if (detail::is_constant_evaluated()) { |
793 | using context = detail::compile_parse_context<Char, ErrorHandler>; |
794 | static_cast<context*>(this)->check_dynamic_spec(arg_id); |
795 | } |
796 | } |
797 | |
798 | template <typename Context> class basic_format_arg; |
799 | template <typename Context> class basic_format_args; |
800 | template <typename Context> class dynamic_format_arg_store; |
801 | |
802 | // A formatter for objects of type T. |
803 | template <typename T, typename Char = char, typename Enable = void> |
804 | struct formatter { |
805 | // A deleted default constructor indicates a disabled formatter. |
806 | formatter() = delete; |
807 | }; |
808 | |
809 | // Specifies if T has an enabled formatter specialization. A type can be |
810 | // formattable even if it doesn't have a formatter e.g. via a conversion. |
811 | template <typename T, typename Context> |
812 | using has_formatter = |
813 | std::is_constructible<typename Context::template formatter_type<T>>; |
814 | |
815 | // Checks whether T is a container with contiguous storage. |
816 | template <typename T> struct is_contiguous : std::false_type {}; |
817 | template <typename Char> |
818 | struct is_contiguous<std::basic_string<Char>> : std::true_type {}; |
819 | |
820 | class appender; |
821 | |
822 | FMT_BEGIN_DETAIL_NAMESPACE |
823 | |
824 | template <typename Context, typename T> |
825 | constexpr auto has_const_formatter_impl(T*) |
826 | -> decltype(typename Context::template formatter_type<T>().format( |
827 | std::declval<const T&>(), std::declval<Context&>()), |
828 | true) { |
829 | return true; |
830 | } |
831 | template <typename Context> |
832 | constexpr auto has_const_formatter_impl(...) -> bool { |
833 | return false; |
834 | } |
835 | template <typename T, typename Context> |
836 | constexpr auto has_const_formatter() -> bool { |
837 | return has_const_formatter_impl<Context>(static_cast<T*>(nullptr)); |
838 | } |
839 | |
840 | // Extracts a reference to the container from back_insert_iterator. |
841 | template <typename Container> |
842 | inline auto get_container(std::back_insert_iterator<Container> it) |
843 | -> Container& { |
844 | using base = std::back_insert_iterator<Container>; |
845 | struct accessor : base { |
846 | accessor(base b) : base(b) {} |
847 | using base::container; |
848 | }; |
849 | return *accessor(it).container; |
850 | } |
851 | |
852 | template <typename Char, typename InputIt, typename OutputIt> |
853 | FMT_CONSTEXPR auto copy_str(InputIt begin, InputIt end, OutputIt out) |
854 | -> OutputIt { |
855 | while (begin != end) *out++ = static_cast<Char>(*begin++); |
856 | return out; |
857 | } |
858 | |
859 | template <typename Char, typename T, typename U, |
860 | FMT_ENABLE_IF( |
861 | std::is_same<remove_const_t<T>, U>::value&& is_char<U>::value)> |
862 | FMT_CONSTEXPR auto copy_str(T* begin, T* end, U* out) -> U* { |
863 | if (is_constant_evaluated()) return copy_str<Char, T*, U*>(begin, end, out); |
864 | auto size = to_unsigned(end - begin); |
865 | memcpy(out, begin, size * sizeof(U)); |
866 | return out + size; |
867 | } |
868 | |
869 | /** |
870 | \rst |
871 | A contiguous memory buffer with an optional growing ability. It is an internal |
872 | class and shouldn't be used directly, only via `~fmt::basic_memory_buffer`. |
873 | \endrst |
874 | */ |
875 | template <typename T> class buffer { |
876 | private: |
877 | T* ptr_; |
878 | size_t size_; |
879 | size_t capacity_; |
880 | |
881 | protected: |
882 | // Don't initialize ptr_ since it is not accessed to save a few cycles. |
883 | FMT_MSC_WARNING(suppress : 26495) |
884 | buffer(size_t sz) noexcept : size_(sz), capacity_(sz) {} |
885 | |
886 | FMT_CONSTEXPR20 buffer(T* p = nullptr, size_t sz = 0, size_t cap = 0) noexcept |
887 | : ptr_(p), size_(sz), capacity_(cap) {} |
888 | |
889 | FMT_CONSTEXPR20 ~buffer() = default; |
890 | buffer(buffer&&) = default; |
891 | |
892 | /** Sets the buffer data and capacity. */ |
893 | FMT_CONSTEXPR void set(T* buf_data, size_t buf_capacity) noexcept { |
894 | ptr_ = buf_data; |
895 | capacity_ = buf_capacity; |
896 | } |
897 | |
898 | /** Increases the buffer capacity to hold at least *capacity* elements. */ |
899 | virtual FMT_CONSTEXPR20 void grow(size_t capacity) = 0; |
900 | |
901 | public: |
902 | using value_type = T; |
903 | using const_reference = const T&; |
904 | |
905 | buffer(const buffer&) = delete; |
906 | void operator=(const buffer&) = delete; |
907 | |
908 | FMT_INLINE auto begin() noexcept -> T* { return ptr_; } |
909 | FMT_INLINE auto end() noexcept -> T* { return ptr_ + size_; } |
910 | |
911 | FMT_INLINE auto begin() const noexcept -> const T* { return ptr_; } |
912 | FMT_INLINE auto end() const noexcept -> const T* { return ptr_ + size_; } |
913 | |
914 | /** Returns the size of this buffer. */ |
915 | constexpr auto size() const noexcept -> size_t { return size_; } |
916 | |
917 | /** Returns the capacity of this buffer. */ |
918 | constexpr auto capacity() const noexcept -> size_t { return capacity_; } |
919 | |
920 | /** Returns a pointer to the buffer data. */ |
921 | FMT_CONSTEXPR auto data() noexcept -> T* { return ptr_; } |
922 | |
923 | /** Returns a pointer to the buffer data. */ |
924 | FMT_CONSTEXPR auto data() const noexcept -> const T* { return ptr_; } |
925 | |
926 | /** Clears this buffer. */ |
927 | void clear() { size_ = 0; } |
928 | |
929 | // Tries resizing the buffer to contain *count* elements. If T is a POD type |
930 | // the new elements may not be initialized. |
931 | FMT_CONSTEXPR20 void try_resize(size_t count) { |
932 | try_reserve(count); |
933 | size_ = count <= capacity_ ? count : capacity_; |
934 | } |
935 | |
936 | // Tries increasing the buffer capacity to *new_capacity*. It can increase the |
937 | // capacity by a smaller amount than requested but guarantees there is space |
938 | // for at least one additional element either by increasing the capacity or by |
939 | // flushing the buffer if it is full. |
940 | FMT_CONSTEXPR20 void try_reserve(size_t new_capacity) { |
941 | if (new_capacity > capacity_) grow(new_capacity); |
942 | } |
943 | |
944 | FMT_CONSTEXPR20 void push_back(const T& value) { |
945 | try_reserve(size_ + 1); |
946 | ptr_[size_++] = value; |
947 | } |
948 | |
949 | /** Appends data to the end of the buffer. */ |
950 | template <typename U> void append(const U* begin, const U* end); |
951 | |
952 | template <typename Idx> FMT_CONSTEXPR auto operator[](Idx index) -> T& { |
953 | return ptr_[index]; |
954 | } |
955 | template <typename Idx> |
956 | FMT_CONSTEXPR auto operator[](Idx index) const -> const T& { |
957 | return ptr_[index]; |
958 | } |
959 | }; |
960 | |
961 | struct buffer_traits { |
962 | explicit buffer_traits(size_t) {} |
963 | auto count() const -> size_t { return 0; } |
964 | auto limit(size_t size) -> size_t { return size; } |
965 | }; |
966 | |
967 | class fixed_buffer_traits { |
968 | private: |
969 | size_t count_ = 0; |
970 | size_t limit_; |
971 | |
972 | public: |
973 | explicit fixed_buffer_traits(size_t limit) : limit_(limit) {} |
974 | auto count() const -> size_t { return count_; } |
975 | auto limit(size_t size) -> size_t { |
976 | size_t n = limit_ > count_ ? limit_ - count_ : 0; |
977 | count_ += size; |
978 | return size < n ? size : n; |
979 | } |
980 | }; |
981 | |
982 | // A buffer that writes to an output iterator when flushed. |
983 | template <typename OutputIt, typename T, typename Traits = buffer_traits> |
984 | class iterator_buffer final : public Traits, public buffer<T> { |
985 | private: |
986 | OutputIt out_; |
987 | enum { buffer_size = 256 }; |
988 | T data_[buffer_size]; |
989 | |
990 | protected: |
991 | FMT_CONSTEXPR20 void grow(size_t) override { |
992 | if (this->size() == buffer_size) flush(); |
993 | } |
994 | |
995 | void flush() { |
996 | auto size = this->size(); |
997 | this->clear(); |
998 | out_ = copy_str<T>(data_, data_ + this->limit(size), out_); |
999 | } |
1000 | |
1001 | public: |
1002 | explicit iterator_buffer(OutputIt out, size_t n = buffer_size) |
1003 | : Traits(n), buffer<T>(data_, 0, buffer_size), out_(out) {} |
1004 | iterator_buffer(iterator_buffer&& other) |
1005 | : Traits(other), buffer<T>(data_, 0, buffer_size), out_(other.out_) {} |
1006 | ~iterator_buffer() { flush(); } |
1007 | |
1008 | auto out() -> OutputIt { |
1009 | flush(); |
1010 | return out_; |
1011 | } |
1012 | auto count() const -> size_t { return Traits::count() + this->size(); } |
1013 | }; |
1014 | |
1015 | template <typename T> |
1016 | class iterator_buffer<T*, T, fixed_buffer_traits> final |
1017 | : public fixed_buffer_traits, |
1018 | public buffer<T> { |
1019 | private: |
1020 | T* out_; |
1021 | enum { buffer_size = 256 }; |
1022 | T data_[buffer_size]; |
1023 | |
1024 | protected: |
1025 | FMT_CONSTEXPR20 void grow(size_t) override { |
1026 | if (this->size() == this->capacity()) flush(); |
1027 | } |
1028 | |
1029 | void flush() { |
1030 | size_t n = this->limit(this->size()); |
1031 | if (this->data() == out_) { |
1032 | out_ += n; |
1033 | this->set(data_, buffer_size); |
1034 | } |
1035 | this->clear(); |
1036 | } |
1037 | |
1038 | public: |
1039 | explicit iterator_buffer(T* out, size_t n = buffer_size) |
1040 | : fixed_buffer_traits(n), buffer<T>(out, 0, n), out_(out) {} |
1041 | iterator_buffer(iterator_buffer&& other) |
1042 | : fixed_buffer_traits(other), |
1043 | buffer<T>(std::move(other)), |
1044 | out_(other.out_) { |
1045 | if (this->data() != out_) { |
1046 | this->set(data_, buffer_size); |
1047 | this->clear(); |
1048 | } |
1049 | } |
1050 | ~iterator_buffer() { flush(); } |
1051 | |
1052 | auto out() -> T* { |
1053 | flush(); |
1054 | return out_; |
1055 | } |
1056 | auto count() const -> size_t { |
1057 | return fixed_buffer_traits::count() + this->size(); |
1058 | } |
1059 | }; |
1060 | |
1061 | template <typename T> class iterator_buffer<T*, T> final : public buffer<T> { |
1062 | protected: |
1063 | FMT_CONSTEXPR20 void grow(size_t) override {} |
1064 | |
1065 | public: |
1066 | explicit iterator_buffer(T* out, size_t = 0) : buffer<T>(out, 0, ~size_t()) {} |
1067 | |
1068 | auto out() -> T* { return &*this->end(); } |
1069 | }; |
1070 | |
1071 | // A buffer that writes to a container with the contiguous storage. |
1072 | template <typename Container> |
1073 | class iterator_buffer<std::back_insert_iterator<Container>, |
1074 | enable_if_t<is_contiguous<Container>::value, |
1075 | typename Container::value_type>> |
1076 | final : public buffer<typename Container::value_type> { |
1077 | private: |
1078 | Container& container_; |
1079 | |
1080 | protected: |
1081 | FMT_CONSTEXPR20 void grow(size_t capacity) override { |
1082 | container_.resize(capacity); |
1083 | this->set(&container_[0], capacity); |
1084 | } |
1085 | |
1086 | public: |
1087 | explicit iterator_buffer(Container& c) |
1088 | : buffer<typename Container::value_type>(c.size()), container_(c) {} |
1089 | explicit iterator_buffer(std::back_insert_iterator<Container> out, size_t = 0) |
1090 | : iterator_buffer(get_container(out)) {} |
1091 | |
1092 | auto out() -> std::back_insert_iterator<Container> { |
1093 | return std::back_inserter(container_); |
1094 | } |
1095 | }; |
1096 | |
1097 | // A buffer that counts the number of code units written discarding the output. |
1098 | template <typename T = char> class counting_buffer final : public buffer<T> { |
1099 | private: |
1100 | enum { buffer_size = 256 }; |
1101 | T data_[buffer_size]; |
1102 | size_t count_ = 0; |
1103 | |
1104 | protected: |
1105 | FMT_CONSTEXPR20 void grow(size_t) override { |
1106 | if (this->size() != buffer_size) return; |
1107 | count_ += this->size(); |
1108 | this->clear(); |
1109 | } |
1110 | |
1111 | public: |
1112 | counting_buffer() : buffer<T>(data_, 0, buffer_size) {} |
1113 | |
1114 | auto count() -> size_t { return count_ + this->size(); } |
1115 | }; |
1116 | |
1117 | template <typename T> |
1118 | using buffer_appender = conditional_t<std::is_same<T, char>::value, appender, |
1119 | std::back_insert_iterator<buffer<T>>>; |
1120 | |
1121 | // Maps an output iterator to a buffer. |
1122 | template <typename T, typename OutputIt> |
1123 | auto get_buffer(OutputIt out) -> iterator_buffer<OutputIt, T> { |
1124 | return iterator_buffer<OutputIt, T>(out); |
1125 | } |
1126 | template <typename T, typename Buf, |
1127 | FMT_ENABLE_IF(std::is_base_of<buffer<char>, Buf>::value)> |
1128 | auto get_buffer(std::back_insert_iterator<Buf> out) -> buffer<char>& { |
1129 | return get_container(out); |
1130 | } |
1131 | |
1132 | template <typename Buf, typename OutputIt> |
1133 | FMT_INLINE auto get_iterator(Buf& buf, OutputIt) -> decltype(buf.out()) { |
1134 | return buf.out(); |
1135 | } |
1136 | template <typename T, typename OutputIt> |
1137 | auto get_iterator(buffer<T>&, OutputIt out) -> OutputIt { |
1138 | return out; |
1139 | } |
1140 | |
1141 | template <typename T, typename Char = char, typename Enable = void> |
1142 | struct fallback_formatter { |
1143 | fallback_formatter() = delete; |
1144 | }; |
1145 | |
1146 | // Specifies if T has an enabled fallback_formatter specialization. |
1147 | template <typename T, typename Char> |
1148 | using has_fallback_formatter = |
1149 | #ifdef FMT_DEPRECATED_OSTREAM |
1150 | std::is_constructible<fallback_formatter<T, Char>>; |
1151 | #else |
1152 | std::false_type; |
1153 | #endif |
1154 | |
1155 | struct view {}; |
1156 | |
1157 | template <typename Char, typename T> struct named_arg : view { |
1158 | const Char* name; |
1159 | const T& value; |
1160 | named_arg(const Char* n, const T& v) : name(n), value(v) {} |
1161 | }; |
1162 | |
1163 | template <typename Char> struct named_arg_info { |
1164 | const Char* name; |
1165 | int id; |
1166 | }; |
1167 | |
1168 | template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS> |
1169 | struct arg_data { |
1170 | // args_[0].named_args points to named_args_ to avoid bloating format_args. |
1171 | // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning. |
1172 | T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : +1)]; |
1173 | named_arg_info<Char> named_args_[NUM_NAMED_ARGS]; |
1174 | |
1175 | template <typename... U> |
1176 | arg_data(const U&... init) : args_{T(named_args_, NUM_NAMED_ARGS), init...} {} |
1177 | arg_data(const arg_data& other) = delete; |
1178 | auto args() const -> const T* { return args_ + 1; } |
1179 | auto named_args() -> named_arg_info<Char>* { return named_args_; } |
1180 | }; |
1181 | |
1182 | template <typename T, typename Char, size_t NUM_ARGS> |
1183 | struct arg_data<T, Char, NUM_ARGS, 0> { |
1184 | // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning. |
1185 | T args_[NUM_ARGS != 0 ? NUM_ARGS : +1]; |
1186 | |
1187 | template <typename... U> |
1188 | FMT_CONSTEXPR FMT_INLINE arg_data(const U&... init) : args_{init...} {} |
1189 | FMT_CONSTEXPR FMT_INLINE auto args() const -> const T* { return args_; } |
1190 | FMT_CONSTEXPR FMT_INLINE auto named_args() -> std::nullptr_t { |
1191 | return nullptr; |
1192 | } |
1193 | }; |
1194 | |
1195 | template <typename Char> |
1196 | inline void init_named_args(named_arg_info<Char>*, int, int) {} |
1197 | |
1198 | template <typename T> struct is_named_arg : std::false_type {}; |
1199 | template <typename T> struct is_statically_named_arg : std::false_type {}; |
1200 | |
1201 | template <typename T, typename Char> |
1202 | struct is_named_arg<named_arg<Char, T>> : std::true_type {}; |
1203 | |
1204 | template <typename Char, typename T, typename... Tail, |
1205 | FMT_ENABLE_IF(!is_named_arg<T>::value)> |
1206 | void init_named_args(named_arg_info<Char>* named_args, int arg_count, |
1207 | int named_arg_count, const T&, const Tail&... args) { |
1208 | init_named_args(named_args, arg_count + 1, named_arg_count, args...); |
1209 | } |
1210 | |
1211 | template <typename Char, typename T, typename... Tail, |
1212 | FMT_ENABLE_IF(is_named_arg<T>::value)> |
1213 | void init_named_args(named_arg_info<Char>* named_args, int arg_count, |
1214 | int named_arg_count, const T& arg, const Tail&... args) { |
1215 | named_args[named_arg_count++] = {arg.name, arg_count}; |
1216 | init_named_args(named_args, arg_count + 1, named_arg_count, args...); |
1217 | } |
1218 | |
1219 | template <typename... Args> |
1220 | FMT_CONSTEXPR FMT_INLINE void init_named_args(std::nullptr_t, int, int, |
1221 | const Args&...) {} |
1222 | |
1223 | template <bool B = false> constexpr auto count() -> size_t { return B ? 1 : 0; } |
1224 | template <bool B1, bool B2, bool... Tail> constexpr auto count() -> size_t { |
1225 | return (B1 ? 1 : 0) + count<B2, Tail...>(); |
1226 | } |
1227 | |
1228 | template <typename... Args> constexpr auto count_named_args() -> size_t { |
1229 | return count<is_named_arg<Args>::value...>(); |
1230 | } |
1231 | |
1232 | template <typename... Args> |
1233 | constexpr auto count_statically_named_args() -> size_t { |
1234 | return count<is_statically_named_arg<Args>::value...>(); |
1235 | } |
1236 | |
1237 | struct unformattable {}; |
1238 | struct unformattable_char : unformattable {}; |
1239 | struct unformattable_const : unformattable {}; |
1240 | struct unformattable_pointer : unformattable {}; |
1241 | |
1242 | template <typename Char> struct string_value { |
1243 | const Char* data; |
1244 | size_t size; |
1245 | }; |
1246 | |
1247 | template <typename Char> struct named_arg_value { |
1248 | const named_arg_info<Char>* data; |
1249 | size_t size; |
1250 | }; |
1251 | |
1252 | template <typename Context> struct custom_value { |
1253 | using parse_context = typename Context::parse_context_type; |
1254 | void* value; |
1255 | void (*format)(void* arg, parse_context& parse_ctx, Context& ctx); |
1256 | }; |
1257 | |
1258 | // A formatting argument value. |
1259 | template <typename Context> class value { |
1260 | public: |
1261 | using char_type = typename Context::char_type; |
1262 | |
1263 | union { |
1264 | monostate no_value; |
1265 | int int_value; |
1266 | unsigned uint_value; |
1267 | long long long_long_value; |
1268 | unsigned long long ulong_long_value; |
1269 | int128_opt int128_value; |
1270 | uint128_opt uint128_value; |
1271 | bool bool_value; |
1272 | char_type char_value; |
1273 | float float_value; |
1274 | double double_value; |
1275 | long double long_double_value; |
1276 | const void* pointer; |
1277 | string_value<char_type> string; |
1278 | custom_value<Context> custom; |
1279 | named_arg_value<char_type> named_args; |
1280 | }; |
1281 | |
1282 | constexpr FMT_INLINE value() : no_value() {} |
1283 | constexpr FMT_INLINE value(int val) : int_value(val) {} |
1284 | constexpr FMT_INLINE value(unsigned val) : uint_value(val) {} |
1285 | constexpr FMT_INLINE value(long long val) : long_long_value(val) {} |
1286 | constexpr FMT_INLINE value(unsigned long long val) : ulong_long_value(val) {} |
1287 | FMT_INLINE value(int128_opt val) : int128_value(val) {} |
1288 | FMT_INLINE value(uint128_opt val) : uint128_value(val) {} |
1289 | constexpr FMT_INLINE value(float val) : float_value(val) {} |
1290 | constexpr FMT_INLINE value(double val) : double_value(val) {} |
1291 | FMT_INLINE value(long double val) : long_double_value(val) {} |
1292 | constexpr FMT_INLINE value(bool val) : bool_value(val) {} |
1293 | constexpr FMT_INLINE value(char_type val) : char_value(val) {} |
1294 | FMT_CONSTEXPR FMT_INLINE value(const char_type* val) { |
1295 | string.data = val; |
1296 | if (is_constant_evaluated()) string.size = {}; |
1297 | } |
1298 | FMT_CONSTEXPR FMT_INLINE value(basic_string_view<char_type> val) { |
1299 | string.data = val.data(); |
1300 | string.size = val.size(); |
1301 | } |
1302 | FMT_INLINE value(const void* val) : pointer(val) {} |
1303 | FMT_INLINE value(const named_arg_info<char_type>* args, size_t size) |
1304 | : named_args{args, size} {} |
1305 | |
1306 | template <typename T> FMT_CONSTEXPR FMT_INLINE value(T& val) { |
1307 | using value_type = remove_cvref_t<T>; |
1308 | custom.value = const_cast<value_type*>(&val); |
1309 | // Get the formatter type through the context to allow different contexts |
1310 | // have different extension points, e.g. `formatter<T>` for `format` and |
1311 | // `printf_formatter<T>` for `printf`. |
1312 | custom.format = format_custom_arg< |
1313 | value_type, |
1314 | conditional_t<has_formatter<value_type, Context>::value, |
1315 | typename Context::template formatter_type<value_type>, |
1316 | fallback_formatter<value_type, char_type>>>; |
1317 | } |
1318 | value(unformattable); |
1319 | value(unformattable_char); |
1320 | value(unformattable_const); |
1321 | value(unformattable_pointer); |
1322 | |
1323 | private: |
1324 | // Formats an argument of a custom type, such as a user-defined class. |
1325 | template <typename T, typename Formatter> |
1326 | static void format_custom_arg(void* arg, |
1327 | typename Context::parse_context_type& parse_ctx, |
1328 | Context& ctx) { |
1329 | auto f = Formatter(); |
1330 | parse_ctx.advance_to(f.parse(parse_ctx)); |
1331 | using qualified_type = |
1332 | conditional_t<has_const_formatter<T, Context>(), const T, T>; |
1333 | ctx.advance_to(f.format(*static_cast<qualified_type*>(arg), ctx)); |
1334 | } |
1335 | }; |
1336 | |
1337 | template <typename Context, typename T> |
1338 | FMT_CONSTEXPR auto make_arg(T&& value) -> basic_format_arg<Context>; |
1339 | |
1340 | // To minimize the number of types we need to deal with, long is translated |
1341 | // either to int or to long long depending on its size. |
1342 | enum { long_short = sizeof(long) == sizeof(int) }; |
1343 | using long_type = conditional_t<long_short, int, long long>; |
1344 | using ulong_type = conditional_t<long_short, unsigned, unsigned long long>; |
1345 | |
1346 | #ifdef __cpp_lib_byte |
1347 | inline auto format_as(std::byte b) -> unsigned char { |
1348 | return static_cast<unsigned char>(b); |
1349 | } |
1350 | #endif |
1351 | |
1352 | template <typename T> struct has_format_as { |
1353 | template <typename U, typename V = decltype(format_as(U())), |
1354 | FMT_ENABLE_IF(std::is_enum<U>::value&& std::is_integral<V>::value)> |
1355 | static auto check(U*) -> std::true_type; |
1356 | static auto check(...) -> std::false_type; |
1357 | |
1358 | enum { value = decltype(check(static_cast<T*>(nullptr)))::value }; |
1359 | }; |
1360 | |
1361 | // Maps formatting arguments to core types. |
1362 | // arg_mapper reports errors by returning unformattable instead of using |
1363 | // static_assert because it's used in the is_formattable trait. |
1364 | template <typename Context> struct arg_mapper { |
1365 | using char_type = typename Context::char_type; |
1366 | |
1367 | FMT_CONSTEXPR FMT_INLINE auto map(signed char val) -> int { return val; } |
1368 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned char val) -> unsigned { |
1369 | return val; |
1370 | } |
1371 | FMT_CONSTEXPR FMT_INLINE auto map(short val) -> int { return val; } |
1372 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned short val) -> unsigned { |
1373 | return val; |
1374 | } |
1375 | FMT_CONSTEXPR FMT_INLINE auto map(int val) -> int { return val; } |
1376 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned val) -> unsigned { return val; } |
1377 | FMT_CONSTEXPR FMT_INLINE auto map(long val) -> long_type { return val; } |
1378 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned long val) -> ulong_type { |
1379 | return val; |
1380 | } |
1381 | FMT_CONSTEXPR FMT_INLINE auto map(long long val) -> long long { return val; } |
1382 | FMT_CONSTEXPR FMT_INLINE auto map(unsigned long long val) |
1383 | -> unsigned long long { |
1384 | return val; |
1385 | } |
1386 | FMT_CONSTEXPR FMT_INLINE auto map(int128_opt val) -> int128_opt { |
1387 | return val; |
1388 | } |
1389 | FMT_CONSTEXPR FMT_INLINE auto map(uint128_opt val) -> uint128_opt { |
1390 | return val; |
1391 | } |
1392 | FMT_CONSTEXPR FMT_INLINE auto map(bool val) -> bool { return val; } |
1393 | |
1394 | template <typename T, FMT_ENABLE_IF(std::is_same<T, char>::value || |
1395 | std::is_same<T, char_type>::value)> |
1396 | FMT_CONSTEXPR FMT_INLINE auto map(T val) -> char_type { |
1397 | return val; |
1398 | } |
1399 | template <typename T, enable_if_t<(std::is_same<T, wchar_t>::value || |
1400 | #ifdef __cpp_char8_t |
1401 | std::is_same<T, char8_t>::value || |
1402 | #endif |
1403 | std::is_same<T, char16_t>::value || |
1404 | std::is_same<T, char32_t>::value) && |
1405 | !std::is_same<T, char_type>::value, |
1406 | int> = 0> |
1407 | FMT_CONSTEXPR FMT_INLINE auto map(T) -> unformattable_char { |
1408 | return {}; |
1409 | } |
1410 | |
1411 | FMT_CONSTEXPR FMT_INLINE auto map(float val) -> float { return val; } |
1412 | FMT_CONSTEXPR FMT_INLINE auto map(double val) -> double { return val; } |
1413 | FMT_CONSTEXPR FMT_INLINE auto map(long double val) -> long double { |
1414 | return val; |
1415 | } |
1416 | |
1417 | FMT_CONSTEXPR FMT_INLINE auto map(char_type* val) -> const char_type* { |
1418 | return val; |
1419 | } |
1420 | FMT_CONSTEXPR FMT_INLINE auto map(const char_type* val) -> const char_type* { |
1421 | return val; |
1422 | } |
1423 | template <typename T, |
1424 | FMT_ENABLE_IF(is_string<T>::value && !std::is_pointer<T>::value && |
1425 | std::is_same<char_type, char_t<T>>::value)> |
1426 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1427 | -> basic_string_view<char_type> { |
1428 | return to_string_view(val); |
1429 | } |
1430 | template <typename T, |
1431 | FMT_ENABLE_IF(is_string<T>::value && !std::is_pointer<T>::value && |
1432 | !std::is_same<char_type, char_t<T>>::value)> |
1433 | FMT_CONSTEXPR FMT_INLINE auto map(const T&) -> unformattable_char { |
1434 | return {}; |
1435 | } |
1436 | template <typename T, |
1437 | FMT_ENABLE_IF( |
1438 | std::is_convertible<T, basic_string_view<char_type>>::value && |
1439 | !is_string<T>::value && !has_formatter<T, Context>::value && |
1440 | !has_fallback_formatter<T, char_type>::value)> |
1441 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1442 | -> basic_string_view<char_type> { |
1443 | return basic_string_view<char_type>(val); |
1444 | } |
1445 | template <typename T, |
1446 | FMT_ENABLE_IF( |
1447 | std::is_convertible<T, std_string_view<char_type>>::value && |
1448 | !std::is_convertible<T, basic_string_view<char_type>>::value && |
1449 | !is_string<T>::value && !has_formatter<T, Context>::value && |
1450 | !has_fallback_formatter<T, char_type>::value)> |
1451 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1452 | -> basic_string_view<char_type> { |
1453 | return std_string_view<char_type>(val); |
1454 | } |
1455 | |
1456 | FMT_CONSTEXPR FMT_INLINE auto map(void* val) -> const void* { return val; } |
1457 | FMT_CONSTEXPR FMT_INLINE auto map(const void* val) -> const void* { |
1458 | return val; |
1459 | } |
1460 | FMT_CONSTEXPR FMT_INLINE auto map(std::nullptr_t val) -> const void* { |
1461 | return val; |
1462 | } |
1463 | |
1464 | // We use SFINAE instead of a const T* parameter to avoid conflicting with |
1465 | // the C array overload. |
1466 | template < |
1467 | typename T, |
1468 | FMT_ENABLE_IF( |
1469 | std::is_pointer<T>::value || std::is_member_pointer<T>::value || |
1470 | std::is_function<typename std::remove_pointer<T>::type>::value || |
1471 | (std::is_convertible<const T&, const void*>::value && |
1472 | !std::is_convertible<const T&, const char_type*>::value && |
1473 | !has_formatter<T, Context>::value))> |
1474 | FMT_CONSTEXPR auto map(const T&) -> unformattable_pointer { |
1475 | return {}; |
1476 | } |
1477 | |
1478 | template <typename T, std::size_t N, |
1479 | FMT_ENABLE_IF(!std::is_same<T, wchar_t>::value)> |
1480 | FMT_CONSTEXPR FMT_INLINE auto map(const T (&values)[N]) -> const T (&)[N] { |
1481 | return values; |
1482 | } |
1483 | |
1484 | template <typename T, |
1485 | FMT_ENABLE_IF( |
1486 | std::is_enum<T>::value&& std::is_convertible<T, int>::value && |
1487 | !has_format_as<T>::value && !has_formatter<T, Context>::value && |
1488 | !has_fallback_formatter<T, char_type>::value)> |
1489 | FMT_DEPRECATED FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1490 | -> decltype(std::declval<arg_mapper>().map( |
1491 | static_cast<underlying_t<T>>(val))) { |
1492 | return map(static_cast<underlying_t<T>>(val)); |
1493 | } |
1494 | |
1495 | template <typename T, FMT_ENABLE_IF(has_format_as<T>::value && |
1496 | !has_formatter<T, Context>::value)> |
1497 | FMT_CONSTEXPR FMT_INLINE auto map(const T& val) |
1498 | -> decltype(std::declval<arg_mapper>().map(format_as(T()))) { |
1499 | return map(format_as(val)); |
1500 | } |
1501 | |
1502 | template <typename T, typename U = remove_cvref_t<T>> |
1503 | struct formattable |
1504 | : bool_constant<has_const_formatter<U, Context>() || |
1505 | !std::is_const<remove_reference_t<T>>::value || |
1506 | has_fallback_formatter<U, char_type>::value> {}; |
1507 | |
1508 | #if (FMT_MSC_VERSION != 0 && FMT_MSC_VERSION < 1910) || \ |
1509 | FMT_ICC_VERSION != 0 || defined(__NVCC__) |
1510 | // Workaround a bug in MSVC and Intel (Issue 2746). |
1511 | template <typename T> FMT_CONSTEXPR FMT_INLINE auto do_map(T&& val) -> T& { |
1512 | return val; |
1513 | } |
1514 | #else |
1515 | template <typename T, FMT_ENABLE_IF(formattable<T>::value)> |
1516 | FMT_CONSTEXPR FMT_INLINE auto do_map(T&& val) -> T& { |
1517 | return val; |
1518 | } |
1519 | template <typename T, FMT_ENABLE_IF(!formattable<T>::value)> |
1520 | FMT_CONSTEXPR FMT_INLINE auto do_map(T&&) -> unformattable_const { |
1521 | return {}; |
1522 | } |
1523 | #endif |
1524 | |
1525 | template <typename T, typename U = remove_cvref_t<T>, |
1526 | FMT_ENABLE_IF(!is_string<U>::value && !is_char<U>::value && |
1527 | !std::is_array<U>::value && |
1528 | !std::is_pointer<U>::value && |
1529 | !has_format_as<U>::value && |
1530 | (has_formatter<U, Context>::value || |
1531 | has_fallback_formatter<U, char_type>::value))> |
1532 | FMT_CONSTEXPR FMT_INLINE auto map(T&& val) |
1533 | -> decltype(this->do_map(std::forward<T>(val))) { |
1534 | return do_map(std::forward<T>(val)); |
1535 | } |
1536 | |
1537 | template <typename T, FMT_ENABLE_IF(is_named_arg<T>::value)> |
1538 | FMT_CONSTEXPR FMT_INLINE auto map(const T& named_arg) |
1539 | -> decltype(std::declval<arg_mapper>().map(named_arg.value)) { |
1540 | return map(named_arg.value); |
1541 | } |
1542 | |
1543 | auto map(...) -> unformattable { return {}; } |
1544 | }; |
1545 | |
1546 | // A type constant after applying arg_mapper<Context>. |
1547 | template <typename T, typename Context> |
1548 | using mapped_type_constant = |
1549 | type_constant<decltype(arg_mapper<Context>().map(std::declval<const T&>())), |
1550 | typename Context::char_type>; |
1551 | |
1552 | enum { packed_arg_bits = 4 }; |
1553 | // Maximum number of arguments with packed types. |
1554 | enum { max_packed_args = 62 / packed_arg_bits }; |
1555 | enum : unsigned long long { is_unpacked_bit = 1ULL << 63 }; |
1556 | enum : unsigned long long { has_named_args_bit = 1ULL << 62 }; |
1557 | |
1558 | FMT_END_DETAIL_NAMESPACE |
1559 | |
1560 | // An output iterator that appends to a buffer. |
1561 | // It is used to reduce symbol sizes for the common case. |
1562 | class appender : public std::back_insert_iterator<detail::buffer<char>> { |
1563 | using base = std::back_insert_iterator<detail::buffer<char>>; |
1564 | |
1565 | public: |
1566 | using std::back_insert_iterator<detail::buffer<char>>::back_insert_iterator; |
1567 | appender(base it) noexcept : base(it) {} |
1568 | FMT_UNCHECKED_ITERATOR(appender); |
1569 | |
1570 | auto operator++() noexcept -> appender& { return *this; } |
1571 | auto operator++(int) noexcept -> appender { return *this; } |
1572 | }; |
1573 | |
1574 | // A formatting argument. It is a trivially copyable/constructible type to |
1575 | // allow storage in basic_memory_buffer. |
1576 | template <typename Context> class basic_format_arg { |
1577 | private: |
1578 | detail::value<Context> value_; |
1579 | detail::type type_; |
1580 | |
1581 | template <typename ContextType, typename T> |
1582 | friend FMT_CONSTEXPR auto detail::make_arg(T&& value) |
1583 | -> basic_format_arg<ContextType>; |
1584 | |
1585 | template <typename Visitor, typename Ctx> |
1586 | friend FMT_CONSTEXPR auto visit_format_arg(Visitor&& vis, |
1587 | const basic_format_arg<Ctx>& arg) |
1588 | -> decltype(vis(0)); |
1589 | |
1590 | friend class basic_format_args<Context>; |
1591 | friend class dynamic_format_arg_store<Context>; |
1592 | |
1593 | using char_type = typename Context::char_type; |
1594 | |
1595 | template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS> |
1596 | friend struct detail::arg_data; |
1597 | |
1598 | basic_format_arg(const detail::named_arg_info<char_type>* args, size_t size) |
1599 | : value_(args, size) {} |
1600 | |
1601 | public: |
1602 | class handle { |
1603 | public: |
1604 | explicit handle(detail::custom_value<Context> custom) : custom_(custom) {} |
1605 | |
1606 | void format(typename Context::parse_context_type& parse_ctx, |
1607 | Context& ctx) const { |
1608 | custom_.format(custom_.value, parse_ctx, ctx); |
1609 | } |
1610 | |
1611 | private: |
1612 | detail::custom_value<Context> custom_; |
1613 | }; |
1614 | |
1615 | constexpr basic_format_arg() : type_(detail::type::none_type) {} |
1616 | |
1617 | constexpr explicit operator bool() const noexcept { |
1618 | return type_ != detail::type::none_type; |
1619 | } |
1620 | |
1621 | auto type() const -> detail::type { return type_; } |
1622 | |
1623 | auto is_integral() const -> bool { return detail::is_integral_type(type_); } |
1624 | auto is_arithmetic() const -> bool { |
1625 | return detail::is_arithmetic_type(type_); |
1626 | } |
1627 | }; |
1628 | |
1629 | /** |
1630 | \rst |
1631 | Visits an argument dispatching to the appropriate visit method based on |
1632 | the argument type. For example, if the argument type is ``double`` then |
1633 | ``vis(value)`` will be called with the value of type ``double``. |
1634 | \endrst |
1635 | */ |
1636 | template <typename Visitor, typename Context> |
1637 | FMT_CONSTEXPR FMT_INLINE auto visit_format_arg( |
1638 | Visitor&& vis, const basic_format_arg<Context>& arg) -> decltype(vis(0)) { |
1639 | switch (arg.type_) { |
1640 | case detail::type::none_type: |
1641 | break; |
1642 | case detail::type::int_type: |
1643 | return vis(arg.value_.int_value); |
1644 | case detail::type::uint_type: |
1645 | return vis(arg.value_.uint_value); |
1646 | case detail::type::long_long_type: |
1647 | return vis(arg.value_.long_long_value); |
1648 | case detail::type::ulong_long_type: |
1649 | return vis(arg.value_.ulong_long_value); |
1650 | case detail::type::int128_type: |
1651 | return vis(detail::convert_for_visit(arg.value_.int128_value)); |
1652 | case detail::type::uint128_type: |
1653 | return vis(detail::convert_for_visit(arg.value_.uint128_value)); |
1654 | case detail::type::bool_type: |
1655 | return vis(arg.value_.bool_value); |
1656 | case detail::type::char_type: |
1657 | return vis(arg.value_.char_value); |
1658 | case detail::type::float_type: |
1659 | return vis(arg.value_.float_value); |
1660 | case detail::type::double_type: |
1661 | return vis(arg.value_.double_value); |
1662 | case detail::type::long_double_type: |
1663 | return vis(arg.value_.long_double_value); |
1664 | case detail::type::cstring_type: |
1665 | return vis(arg.value_.string.data); |
1666 | case detail::type::string_type: |
1667 | using sv = basic_string_view<typename Context::char_type>; |
1668 | return vis(sv(arg.value_.string.data, arg.value_.string.size)); |
1669 | case detail::type::pointer_type: |
1670 | return vis(arg.value_.pointer); |
1671 | case detail::type::custom_type: |
1672 | return vis(typename basic_format_arg<Context>::handle(arg.value_.custom)); |
1673 | } |
1674 | return vis(monostate()); |
1675 | } |
1676 | |
1677 | FMT_BEGIN_DETAIL_NAMESPACE |
1678 | |
1679 | template <typename Char, typename InputIt> |
1680 | auto copy_str(InputIt begin, InputIt end, appender out) -> appender { |
1681 | get_container(out).append(begin, end); |
1682 | return out; |
1683 | } |
1684 | |
1685 | template <typename Char, typename R, typename OutputIt> |
1686 | FMT_CONSTEXPR auto copy_str(R&& rng, OutputIt out) -> OutputIt { |
1687 | return detail::copy_str<Char>(rng.begin(), rng.end(), out); |
1688 | } |
1689 | |
1690 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 500 |
1691 | // A workaround for gcc 4.8 to make void_t work in a SFINAE context. |
1692 | template <typename... Ts> struct void_t_impl { using type = void; }; |
1693 | template <typename... Ts> |
1694 | using void_t = typename detail::void_t_impl<Ts...>::type; |
1695 | #else |
1696 | template <typename...> using void_t = void; |
1697 | #endif |
1698 | |
1699 | template <typename It, typename T, typename Enable = void> |
1700 | struct is_output_iterator : std::false_type {}; |
1701 | |
1702 | template <typename It, typename T> |
1703 | struct is_output_iterator< |
1704 | It, T, |
1705 | void_t<typename std::iterator_traits<It>::iterator_category, |
1706 | decltype(*std::declval<It>() = std::declval<T>())>> |
1707 | : std::true_type {}; |
1708 | |
1709 | template <typename OutputIt> |
1710 | struct is_back_insert_iterator : std::false_type {}; |
1711 | template <typename Container> |
1712 | struct is_back_insert_iterator<std::back_insert_iterator<Container>> |
1713 | : std::true_type {}; |
1714 | |
1715 | template <typename OutputIt> |
1716 | struct is_contiguous_back_insert_iterator : std::false_type {}; |
1717 | template <typename Container> |
1718 | struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>> |
1719 | : is_contiguous<Container> {}; |
1720 | template <> |
1721 | struct is_contiguous_back_insert_iterator<appender> : std::true_type {}; |
1722 | |
1723 | // A type-erased reference to an std::locale to avoid a heavy <locale> include. |
1724 | class locale_ref { |
1725 | private: |
1726 | const void* locale_; // A type-erased pointer to std::locale. |
1727 | |
1728 | public: |
1729 | constexpr FMT_INLINE locale_ref() : locale_(nullptr) {} |
1730 | template <typename Locale> explicit locale_ref(const Locale& loc); |
1731 | |
1732 | explicit operator bool() const noexcept { return locale_ != nullptr; } |
1733 | |
1734 | template <typename Locale> auto get() const -> Locale; |
1735 | }; |
1736 | |
1737 | template <typename> constexpr auto encode_types() -> unsigned long long { |
1738 | return 0; |
1739 | } |
1740 | |
1741 | template <typename Context, typename Arg, typename... Args> |
1742 | constexpr auto encode_types() -> unsigned long long { |
1743 | return static_cast<unsigned>(mapped_type_constant<Arg, Context>::value) | |
1744 | (encode_types<Context, Args...>() << packed_arg_bits); |
1745 | } |
1746 | |
1747 | template <typename Context, typename T> |
1748 | FMT_CONSTEXPR FMT_INLINE auto make_value(T&& val) -> value<Context> { |
1749 | const auto& arg = arg_mapper<Context>().map(FMT_FORWARD(val)); |
1750 | |
1751 | constexpr bool formattable_char = |
1752 | !std::is_same<decltype(arg), const unformattable_char&>::value; |
1753 | static_assert(formattable_char, "Mixing character types is disallowed." ); |
1754 | |
1755 | constexpr bool formattable_const = |
1756 | !std::is_same<decltype(arg), const unformattable_const&>::value; |
1757 | static_assert(formattable_const, "Cannot format a const argument." ); |
1758 | |
1759 | // Formatting of arbitrary pointers is disallowed. If you want to output |
1760 | // a pointer cast it to "void *" or "const void *". In particular, this |
1761 | // forbids formatting of "[const] volatile char *" which is printed as bool |
1762 | // by iostreams. |
1763 | constexpr bool formattable_pointer = |
1764 | !std::is_same<decltype(arg), const unformattable_pointer&>::value; |
1765 | static_assert(formattable_pointer, |
1766 | "Formatting of non-void pointers is disallowed." ); |
1767 | |
1768 | constexpr bool formattable = |
1769 | !std::is_same<decltype(arg), const unformattable&>::value; |
1770 | static_assert( |
1771 | formattable, |
1772 | "Cannot format an argument. To make type T formattable provide a " |
1773 | "formatter<T> specialization: https://fmt.dev/latest/api.html#udt" ); |
1774 | return {arg}; |
1775 | } |
1776 | |
1777 | template <typename Context, typename T> |
1778 | FMT_CONSTEXPR auto make_arg(T&& value) -> basic_format_arg<Context> { |
1779 | basic_format_arg<Context> arg; |
1780 | arg.type_ = mapped_type_constant<T, Context>::value; |
1781 | arg.value_ = make_value<Context>(value); |
1782 | return arg; |
1783 | } |
1784 | |
1785 | // The type template parameter is there to avoid an ODR violation when using |
1786 | // a fallback formatter in one translation unit and an implicit conversion in |
1787 | // another (not recommended). |
1788 | template <bool IS_PACKED, typename Context, type, typename T, |
1789 | FMT_ENABLE_IF(IS_PACKED)> |
1790 | FMT_CONSTEXPR FMT_INLINE auto make_arg(T&& val) -> value<Context> { |
1791 | return make_value<Context>(val); |
1792 | } |
1793 | |
1794 | template <bool IS_PACKED, typename Context, type, typename T, |
1795 | FMT_ENABLE_IF(!IS_PACKED)> |
1796 | FMT_CONSTEXPR inline auto make_arg(T&& value) -> basic_format_arg<Context> { |
1797 | return make_arg<Context>(value); |
1798 | } |
1799 | FMT_END_DETAIL_NAMESPACE |
1800 | |
1801 | // Formatting context. |
1802 | template <typename OutputIt, typename Char> class basic_format_context { |
1803 | public: |
1804 | /** The character type for the output. */ |
1805 | using char_type = Char; |
1806 | |
1807 | private: |
1808 | OutputIt out_; |
1809 | basic_format_args<basic_format_context> args_; |
1810 | detail::locale_ref loc_; |
1811 | |
1812 | public: |
1813 | using iterator = OutputIt; |
1814 | using format_arg = basic_format_arg<basic_format_context>; |
1815 | using parse_context_type = basic_format_parse_context<Char>; |
1816 | template <typename T> using formatter_type = formatter<T, char_type>; |
1817 | |
1818 | basic_format_context(basic_format_context&&) = default; |
1819 | basic_format_context(const basic_format_context&) = delete; |
1820 | void operator=(const basic_format_context&) = delete; |
1821 | /** |
1822 | Constructs a ``basic_format_context`` object. References to the arguments are |
1823 | stored in the object so make sure they have appropriate lifetimes. |
1824 | */ |
1825 | constexpr basic_format_context( |
1826 | OutputIt out, basic_format_args<basic_format_context> ctx_args, |
1827 | detail::locale_ref loc = detail::locale_ref()) |
1828 | : out_(out), args_(ctx_args), loc_(loc) {} |
1829 | |
1830 | constexpr auto arg(int id) const -> format_arg { return args_.get(id); } |
1831 | FMT_CONSTEXPR auto arg(basic_string_view<char_type> name) -> format_arg { |
1832 | return args_.get(name); |
1833 | } |
1834 | FMT_CONSTEXPR auto arg_id(basic_string_view<char_type> name) -> int { |
1835 | return args_.get_id(name); |
1836 | } |
1837 | auto args() const -> const basic_format_args<basic_format_context>& { |
1838 | return args_; |
1839 | } |
1840 | |
1841 | FMT_CONSTEXPR auto error_handler() -> detail::error_handler { return {}; } |
1842 | void on_error(const char* message) { error_handler().on_error(message); } |
1843 | |
1844 | // Returns an iterator to the beginning of the output range. |
1845 | FMT_CONSTEXPR auto out() -> iterator { return out_; } |
1846 | |
1847 | // Advances the begin iterator to ``it``. |
1848 | void advance_to(iterator it) { |
1849 | if (!detail::is_back_insert_iterator<iterator>()) out_ = it; |
1850 | } |
1851 | |
1852 | FMT_CONSTEXPR auto locale() -> detail::locale_ref { return loc_; } |
1853 | }; |
1854 | |
1855 | template <typename Char> |
1856 | using buffer_context = |
1857 | basic_format_context<detail::buffer_appender<Char>, Char>; |
1858 | using format_context = buffer_context<char>; |
1859 | |
1860 | // Workaround an alias issue: https://stackoverflow.com/q/62767544/471164. |
1861 | #define FMT_BUFFER_CONTEXT(Char) \ |
1862 | basic_format_context<detail::buffer_appender<Char>, Char> |
1863 | |
1864 | template <typename T, typename Char = char> |
1865 | using is_formattable = bool_constant< |
1866 | !std::is_base_of<detail::unformattable, |
1867 | decltype(detail::arg_mapper<buffer_context<Char>>().map( |
1868 | std::declval<T>()))>::value && |
1869 | !detail::has_fallback_formatter<T, Char>::value>; |
1870 | |
1871 | /** |
1872 | \rst |
1873 | An array of references to arguments. It can be implicitly converted into |
1874 | `~fmt::basic_format_args` for passing into type-erased formatting functions |
1875 | such as `~fmt::vformat`. |
1876 | \endrst |
1877 | */ |
1878 | template <typename Context, typename... Args> |
1879 | class format_arg_store |
1880 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
1881 | // Workaround a GCC template argument substitution bug. |
1882 | : public basic_format_args<Context> |
1883 | #endif |
1884 | { |
1885 | private: |
1886 | static const size_t num_args = sizeof...(Args); |
1887 | static const size_t num_named_args = detail::count_named_args<Args...>(); |
1888 | static const bool is_packed = num_args <= detail::max_packed_args; |
1889 | |
1890 | using value_type = conditional_t<is_packed, detail::value<Context>, |
1891 | basic_format_arg<Context>>; |
1892 | |
1893 | detail::arg_data<value_type, typename Context::char_type, num_args, |
1894 | num_named_args> |
1895 | data_; |
1896 | |
1897 | friend class basic_format_args<Context>; |
1898 | |
1899 | static constexpr unsigned long long desc = |
1900 | (is_packed ? detail::encode_types<Context, Args...>() |
1901 | : detail::is_unpacked_bit | num_args) | |
1902 | (num_named_args != 0 |
1903 | ? static_cast<unsigned long long>(detail::has_named_args_bit) |
1904 | : 0); |
1905 | |
1906 | public: |
1907 | template <typename... T> |
1908 | FMT_CONSTEXPR FMT_INLINE format_arg_store(T&&... args) |
1909 | : |
1910 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
1911 | basic_format_args<Context>(*this), |
1912 | #endif |
1913 | data_{detail::make_arg< |
1914 | is_packed, Context, |
1915 | detail::mapped_type_constant<remove_cvref_t<T>, Context>::value>( |
1916 | FMT_FORWARD(args))...} { |
1917 | detail::init_named_args(data_.named_args(), 0, 0, args...); |
1918 | } |
1919 | }; |
1920 | |
1921 | /** |
1922 | \rst |
1923 | Constructs a `~fmt::format_arg_store` object that contains references to |
1924 | arguments and can be implicitly converted to `~fmt::format_args`. `Context` |
1925 | can be omitted in which case it defaults to `~fmt::context`. |
1926 | See `~fmt::arg` for lifetime considerations. |
1927 | \endrst |
1928 | */ |
1929 | template <typename Context = format_context, typename... Args> |
1930 | constexpr auto make_format_args(Args&&... args) |
1931 | -> format_arg_store<Context, remove_cvref_t<Args>...> { |
1932 | return {FMT_FORWARD(args)...}; |
1933 | } |
1934 | |
1935 | /** |
1936 | \rst |
1937 | Returns a named argument to be used in a formatting function. |
1938 | It should only be used in a call to a formatting function or |
1939 | `dynamic_format_arg_store::push_back`. |
1940 | |
1941 | **Example**:: |
1942 | |
1943 | fmt::print("Elapsed time: {s:.2f} seconds", fmt::arg("s", 1.23)); |
1944 | \endrst |
1945 | */ |
1946 | template <typename Char, typename T> |
1947 | inline auto arg(const Char* name, const T& arg) -> detail::named_arg<Char, T> { |
1948 | static_assert(!detail::is_named_arg<T>(), "nested named arguments" ); |
1949 | return {name, arg}; |
1950 | } |
1951 | |
1952 | /** |
1953 | \rst |
1954 | A view of a collection of formatting arguments. To avoid lifetime issues it |
1955 | should only be used as a parameter type in type-erased functions such as |
1956 | ``vformat``:: |
1957 | |
1958 | void vlog(string_view format_str, format_args args); // OK |
1959 | format_args args = make_format_args(42); // Error: dangling reference |
1960 | \endrst |
1961 | */ |
1962 | template <typename Context> class basic_format_args { |
1963 | public: |
1964 | using size_type = int; |
1965 | using format_arg = basic_format_arg<Context>; |
1966 | |
1967 | private: |
1968 | // A descriptor that contains information about formatting arguments. |
1969 | // If the number of arguments is less or equal to max_packed_args then |
1970 | // argument types are passed in the descriptor. This reduces binary code size |
1971 | // per formatting function call. |
1972 | unsigned long long desc_; |
1973 | union { |
1974 | // If is_packed() returns true then argument values are stored in values_; |
1975 | // otherwise they are stored in args_. This is done to improve cache |
1976 | // locality and reduce compiled code size since storing larger objects |
1977 | // may require more code (at least on x86-64) even if the same amount of |
1978 | // data is actually copied to stack. It saves ~10% on the bloat test. |
1979 | const detail::value<Context>* values_; |
1980 | const format_arg* args_; |
1981 | }; |
1982 | |
1983 | constexpr auto is_packed() const -> bool { |
1984 | return (desc_ & detail::is_unpacked_bit) == 0; |
1985 | } |
1986 | auto has_named_args() const -> bool { |
1987 | return (desc_ & detail::has_named_args_bit) != 0; |
1988 | } |
1989 | |
1990 | FMT_CONSTEXPR auto type(int index) const -> detail::type { |
1991 | int shift = index * detail::packed_arg_bits; |
1992 | unsigned int mask = (1 << detail::packed_arg_bits) - 1; |
1993 | return static_cast<detail::type>((desc_ >> shift) & mask); |
1994 | } |
1995 | |
1996 | constexpr FMT_INLINE basic_format_args(unsigned long long desc, |
1997 | const detail::value<Context>* values) |
1998 | : desc_(desc), values_(values) {} |
1999 | constexpr basic_format_args(unsigned long long desc, const format_arg* args) |
2000 | : desc_(desc), args_(args) {} |
2001 | |
2002 | public: |
2003 | constexpr basic_format_args() : desc_(0), args_(nullptr) {} |
2004 | |
2005 | /** |
2006 | \rst |
2007 | Constructs a `basic_format_args` object from `~fmt::format_arg_store`. |
2008 | \endrst |
2009 | */ |
2010 | template <typename... Args> |
2011 | constexpr FMT_INLINE basic_format_args( |
2012 | const format_arg_store<Context, Args...>& store) |
2013 | : basic_format_args(format_arg_store<Context, Args...>::desc, |
2014 | store.data_.args()) {} |
2015 | |
2016 | /** |
2017 | \rst |
2018 | Constructs a `basic_format_args` object from |
2019 | `~fmt::dynamic_format_arg_store`. |
2020 | \endrst |
2021 | */ |
2022 | constexpr FMT_INLINE basic_format_args( |
2023 | const dynamic_format_arg_store<Context>& store) |
2024 | : basic_format_args(store.get_types(), store.data()) {} |
2025 | |
2026 | /** |
2027 | \rst |
2028 | Constructs a `basic_format_args` object from a dynamic set of arguments. |
2029 | \endrst |
2030 | */ |
2031 | constexpr basic_format_args(const format_arg* args, int count) |
2032 | : basic_format_args(detail::is_unpacked_bit | detail::to_unsigned(count), |
2033 | args) {} |
2034 | |
2035 | /** Returns the argument with the specified id. */ |
2036 | FMT_CONSTEXPR auto get(int id) const -> format_arg { |
2037 | format_arg arg; |
2038 | if (!is_packed()) { |
2039 | if (id < max_size()) arg = args_[id]; |
2040 | return arg; |
2041 | } |
2042 | if (id >= detail::max_packed_args) return arg; |
2043 | arg.type_ = type(id); |
2044 | if (arg.type_ == detail::type::none_type) return arg; |
2045 | arg.value_ = values_[id]; |
2046 | return arg; |
2047 | } |
2048 | |
2049 | template <typename Char> |
2050 | auto get(basic_string_view<Char> name) const -> format_arg { |
2051 | int id = get_id(name); |
2052 | return id >= 0 ? get(id) : format_arg(); |
2053 | } |
2054 | |
2055 | template <typename Char> |
2056 | auto get_id(basic_string_view<Char> name) const -> int { |
2057 | if (!has_named_args()) return -1; |
2058 | const auto& named_args = |
2059 | (is_packed() ? values_[-1] : args_[-1].value_).named_args; |
2060 | for (size_t i = 0; i < named_args.size; ++i) { |
2061 | if (named_args.data[i].name == name) return named_args.data[i].id; |
2062 | } |
2063 | return -1; |
2064 | } |
2065 | |
2066 | auto max_size() const -> int { |
2067 | unsigned long long max_packed = detail::max_packed_args; |
2068 | return static_cast<int>(is_packed() ? max_packed |
2069 | : desc_ & ~detail::is_unpacked_bit); |
2070 | } |
2071 | }; |
2072 | |
2073 | /** An alias to ``basic_format_args<format_context>``. */ |
2074 | // A separate type would result in shorter symbols but break ABI compatibility |
2075 | // between clang and gcc on ARM (#1919). |
2076 | using format_args = basic_format_args<format_context>; |
2077 | |
2078 | // We cannot use enum classes as bit fields because of a gcc bug, so we put them |
2079 | // in namespaces instead (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414). |
2080 | // Additionally, if an underlying type is specified, older gcc incorrectly warns |
2081 | // that the type is too small. Both bugs are fixed in gcc 9.3. |
2082 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 903 |
2083 | # define FMT_ENUM_UNDERLYING_TYPE(type) |
2084 | #else |
2085 | # define FMT_ENUM_UNDERLYING_TYPE(type) : type |
2086 | #endif |
2087 | namespace align { |
2088 | enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, left, right, center, |
2089 | numeric}; |
2090 | } |
2091 | using align_t = align::type; |
2092 | namespace sign { |
2093 | enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, minus, plus, space}; |
2094 | } |
2095 | using sign_t = sign::type; |
2096 | |
2097 | FMT_BEGIN_DETAIL_NAMESPACE |
2098 | |
2099 | // Workaround an array initialization issue in gcc 4.8. |
2100 | template <typename Char> struct fill_t { |
2101 | private: |
2102 | enum { max_size = 4 }; |
2103 | Char data_[max_size] = {Char(' '), Char(0), Char(0), Char(0)}; |
2104 | unsigned char size_ = 1; |
2105 | |
2106 | public: |
2107 | FMT_CONSTEXPR void operator=(basic_string_view<Char> s) { |
2108 | auto size = s.size(); |
2109 | if (size > max_size) return throw_format_error("invalid fill" ); |
2110 | for (size_t i = 0; i < size; ++i) data_[i] = s[i]; |
2111 | size_ = static_cast<unsigned char>(size); |
2112 | } |
2113 | |
2114 | constexpr auto size() const -> size_t { return size_; } |
2115 | constexpr auto data() const -> const Char* { return data_; } |
2116 | |
2117 | FMT_CONSTEXPR auto operator[](size_t index) -> Char& { return data_[index]; } |
2118 | FMT_CONSTEXPR auto operator[](size_t index) const -> const Char& { |
2119 | return data_[index]; |
2120 | } |
2121 | }; |
2122 | FMT_END_DETAIL_NAMESPACE |
2123 | |
2124 | enum class presentation_type : unsigned char { |
2125 | none, |
2126 | // Integer types should go first, |
2127 | dec, // 'd' |
2128 | oct, // 'o' |
2129 | hex_lower, // 'x' |
2130 | hex_upper, // 'X' |
2131 | bin_lower, // 'b' |
2132 | bin_upper, // 'B' |
2133 | hexfloat_lower, // 'a' |
2134 | hexfloat_upper, // 'A' |
2135 | exp_lower, // 'e' |
2136 | exp_upper, // 'E' |
2137 | fixed_lower, // 'f' |
2138 | fixed_upper, // 'F' |
2139 | general_lower, // 'g' |
2140 | general_upper, // 'G' |
2141 | chr, // 'c' |
2142 | string, // 's' |
2143 | pointer, // 'p' |
2144 | debug // '?' |
2145 | }; |
2146 | |
2147 | // Format specifiers for built-in and string types. |
2148 | template <typename Char> struct basic_format_specs { |
2149 | int width; |
2150 | int precision; |
2151 | presentation_type type; |
2152 | align_t align : 4; |
2153 | sign_t sign : 3; |
2154 | bool alt : 1; // Alternate form ('#'). |
2155 | bool localized : 1; |
2156 | detail::fill_t<Char> fill; |
2157 | |
2158 | constexpr basic_format_specs() |
2159 | : width(0), |
2160 | precision(-1), |
2161 | type(presentation_type::none), |
2162 | align(align::none), |
2163 | sign(sign::none), |
2164 | alt(false), |
2165 | localized(false) {} |
2166 | }; |
2167 | |
2168 | using format_specs = basic_format_specs<char>; |
2169 | |
2170 | FMT_BEGIN_DETAIL_NAMESPACE |
2171 | |
2172 | enum class arg_id_kind { none, index, name }; |
2173 | |
2174 | // An argument reference. |
2175 | template <typename Char> struct arg_ref { |
2176 | FMT_CONSTEXPR arg_ref() : kind(arg_id_kind::none), val() {} |
2177 | |
2178 | FMT_CONSTEXPR explicit arg_ref(int index) |
2179 | : kind(arg_id_kind::index), val(index) {} |
2180 | FMT_CONSTEXPR explicit arg_ref(basic_string_view<Char> name) |
2181 | : kind(arg_id_kind::name), val(name) {} |
2182 | |
2183 | FMT_CONSTEXPR auto operator=(int idx) -> arg_ref& { |
2184 | kind = arg_id_kind::index; |
2185 | val.index = idx; |
2186 | return *this; |
2187 | } |
2188 | |
2189 | arg_id_kind kind; |
2190 | union value { |
2191 | FMT_CONSTEXPR value(int id = 0) : index{id} {} |
2192 | FMT_CONSTEXPR value(basic_string_view<Char> n) : name(n) {} |
2193 | |
2194 | int index; |
2195 | basic_string_view<Char> name; |
2196 | } val; |
2197 | }; |
2198 | |
2199 | // Format specifiers with width and precision resolved at formatting rather |
2200 | // than parsing time to allow re-using the same parsed specifiers with |
2201 | // different sets of arguments (precompilation of format strings). |
2202 | template <typename Char> |
2203 | struct dynamic_format_specs : basic_format_specs<Char> { |
2204 | arg_ref<Char> width_ref; |
2205 | arg_ref<Char> precision_ref; |
2206 | }; |
2207 | |
2208 | struct auto_id {}; |
2209 | |
2210 | // A format specifier handler that sets fields in basic_format_specs. |
2211 | template <typename Char> class specs_setter { |
2212 | protected: |
2213 | basic_format_specs<Char>& specs_; |
2214 | |
2215 | public: |
2216 | explicit FMT_CONSTEXPR specs_setter(basic_format_specs<Char>& specs) |
2217 | : specs_(specs) {} |
2218 | |
2219 | FMT_CONSTEXPR specs_setter(const specs_setter& other) |
2220 | : specs_(other.specs_) {} |
2221 | |
2222 | FMT_CONSTEXPR void on_align(align_t align) { specs_.align = align; } |
2223 | FMT_CONSTEXPR void on_fill(basic_string_view<Char> fill) { |
2224 | specs_.fill = fill; |
2225 | } |
2226 | FMT_CONSTEXPR void on_sign(sign_t s) { specs_.sign = s; } |
2227 | FMT_CONSTEXPR void on_hash() { specs_.alt = true; } |
2228 | FMT_CONSTEXPR void on_localized() { specs_.localized = true; } |
2229 | |
2230 | FMT_CONSTEXPR void on_zero() { |
2231 | if (specs_.align == align::none) specs_.align = align::numeric; |
2232 | specs_.fill[0] = Char('0'); |
2233 | } |
2234 | |
2235 | FMT_CONSTEXPR void on_width(int width) { specs_.width = width; } |
2236 | FMT_CONSTEXPR void on_precision(int precision) { |
2237 | specs_.precision = precision; |
2238 | } |
2239 | FMT_CONSTEXPR void end_precision() {} |
2240 | |
2241 | FMT_CONSTEXPR void on_type(presentation_type type) { specs_.type = type; } |
2242 | }; |
2243 | |
2244 | // Format spec handler that saves references to arguments representing dynamic |
2245 | // width and precision to be resolved at formatting time. |
2246 | template <typename ParseContext> |
2247 | class dynamic_specs_handler |
2248 | : public specs_setter<typename ParseContext::char_type> { |
2249 | public: |
2250 | using char_type = typename ParseContext::char_type; |
2251 | |
2252 | FMT_CONSTEXPR dynamic_specs_handler(dynamic_format_specs<char_type>& specs, |
2253 | ParseContext& ctx) |
2254 | : specs_setter<char_type>(specs), specs_(specs), context_(ctx) {} |
2255 | |
2256 | FMT_CONSTEXPR dynamic_specs_handler(const dynamic_specs_handler& other) |
2257 | : specs_setter<char_type>(other), |
2258 | specs_(other.specs_), |
2259 | context_(other.context_) {} |
2260 | |
2261 | template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
2262 | specs_.width_ref = make_arg_ref(arg_id); |
2263 | } |
2264 | |
2265 | template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
2266 | specs_.precision_ref = make_arg_ref(arg_id); |
2267 | } |
2268 | |
2269 | FMT_CONSTEXPR void on_error(const char* message) { |
2270 | context_.on_error(message); |
2271 | } |
2272 | |
2273 | private: |
2274 | dynamic_format_specs<char_type>& specs_; |
2275 | ParseContext& context_; |
2276 | |
2277 | using arg_ref_type = arg_ref<char_type>; |
2278 | |
2279 | FMT_CONSTEXPR auto make_arg_ref(int arg_id) -> arg_ref_type { |
2280 | context_.check_arg_id(arg_id); |
2281 | context_.check_dynamic_spec(arg_id); |
2282 | return arg_ref_type(arg_id); |
2283 | } |
2284 | |
2285 | FMT_CONSTEXPR auto make_arg_ref(auto_id) -> arg_ref_type { |
2286 | int arg_id = context_.next_arg_id(); |
2287 | context_.check_dynamic_spec(arg_id); |
2288 | return arg_ref_type(arg_id); |
2289 | } |
2290 | |
2291 | FMT_CONSTEXPR auto make_arg_ref(basic_string_view<char_type> arg_id) |
2292 | -> arg_ref_type { |
2293 | context_.check_arg_id(arg_id); |
2294 | basic_string_view<char_type> format_str( |
2295 | context_.begin(), to_unsigned(context_.end() - context_.begin())); |
2296 | return arg_ref_type(arg_id); |
2297 | } |
2298 | }; |
2299 | |
2300 | template <typename Char> constexpr bool is_ascii_letter(Char c) { |
2301 | return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); |
2302 | } |
2303 | |
2304 | // Converts a character to ASCII. Returns a number > 127 on conversion failure. |
2305 | template <typename Char, FMT_ENABLE_IF(std::is_integral<Char>::value)> |
2306 | constexpr auto to_ascii(Char c) -> Char { |
2307 | return c; |
2308 | } |
2309 | template <typename Char, FMT_ENABLE_IF(std::is_enum<Char>::value)> |
2310 | constexpr auto to_ascii(Char c) -> underlying_t<Char> { |
2311 | return c; |
2312 | } |
2313 | |
2314 | FMT_CONSTEXPR inline auto code_point_length_impl(char c) -> int { |
2315 | 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" |
2316 | [static_cast<unsigned char>(c) >> 3]; |
2317 | } |
2318 | |
2319 | template <typename Char> |
2320 | FMT_CONSTEXPR auto code_point_length(const Char* begin) -> int { |
2321 | if (const_check(sizeof(Char) != 1)) return 1; |
2322 | int len = code_point_length_impl(static_cast<char>(*begin)); |
2323 | |
2324 | // Compute the pointer to the next character early so that the next |
2325 | // iteration can start working on the next character. Neither Clang |
2326 | // nor GCC figure out this reordering on their own. |
2327 | return len + !len; |
2328 | } |
2329 | |
2330 | // Return the result via the out param to workaround gcc bug 77539. |
2331 | template <bool IS_CONSTEXPR, typename T, typename Ptr = const T*> |
2332 | FMT_CONSTEXPR auto find(Ptr first, Ptr last, T value, Ptr& out) -> bool { |
2333 | for (out = first; out != last; ++out) { |
2334 | if (*out == value) return true; |
2335 | } |
2336 | return false; |
2337 | } |
2338 | |
2339 | template <> |
2340 | inline auto find<false, char>(const char* first, const char* last, char value, |
2341 | const char*& out) -> bool { |
2342 | out = static_cast<const char*>( |
2343 | std::memchr(first, value, to_unsigned(last - first))); |
2344 | return out != nullptr; |
2345 | } |
2346 | |
2347 | // Parses the range [begin, end) as an unsigned integer. This function assumes |
2348 | // that the range is non-empty and the first character is a digit. |
2349 | template <typename Char> |
2350 | FMT_CONSTEXPR auto parse_nonnegative_int(const Char*& begin, const Char* end, |
2351 | int error_value) noexcept -> int { |
2352 | FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', "" ); |
2353 | unsigned value = 0, prev = 0; |
2354 | auto p = begin; |
2355 | do { |
2356 | prev = value; |
2357 | value = value * 10 + unsigned(*p - '0'); |
2358 | ++p; |
2359 | } while (p != end && '0' <= *p && *p <= '9'); |
2360 | auto num_digits = p - begin; |
2361 | begin = p; |
2362 | if (num_digits <= std::numeric_limits<int>::digits10) |
2363 | return static_cast<int>(value); |
2364 | // Check for overflow. |
2365 | const unsigned max = to_unsigned((std::numeric_limits<int>::max)()); |
2366 | return num_digits == std::numeric_limits<int>::digits10 + 1 && |
2367 | prev * 10ull + unsigned(p[-1] - '0') <= max |
2368 | ? static_cast<int>(value) |
2369 | : error_value; |
2370 | } |
2371 | |
2372 | // Parses fill and alignment. |
2373 | template <typename Char, typename Handler> |
2374 | FMT_CONSTEXPR auto parse_align(const Char* begin, const Char* end, |
2375 | Handler&& handler) -> const Char* { |
2376 | FMT_ASSERT(begin != end, "" ); |
2377 | auto align = align::none; |
2378 | auto p = begin + code_point_length(begin); |
2379 | if (end - p <= 0) p = begin; |
2380 | for (;;) { |
2381 | switch (to_ascii(*p)) { |
2382 | case '<': |
2383 | align = align::left; |
2384 | break; |
2385 | case '>': |
2386 | align = align::right; |
2387 | break; |
2388 | case '^': |
2389 | align = align::center; |
2390 | break; |
2391 | default: |
2392 | break; |
2393 | } |
2394 | if (align != align::none) { |
2395 | if (p != begin) { |
2396 | auto c = *begin; |
2397 | if (c == '{') |
2398 | return handler.on_error("invalid fill character '{'" ), begin; |
2399 | if (c == '}') return begin; |
2400 | handler.on_fill(basic_string_view<Char>(begin, to_unsigned(p - begin))); |
2401 | begin = p + 1; |
2402 | } else |
2403 | ++begin; |
2404 | handler.on_align(align); |
2405 | break; |
2406 | } else if (p == begin) { |
2407 | break; |
2408 | } |
2409 | p = begin; |
2410 | } |
2411 | return begin; |
2412 | } |
2413 | |
2414 | template <typename Char> FMT_CONSTEXPR bool is_name_start(Char c) { |
2415 | return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || '_' == c; |
2416 | } |
2417 | |
2418 | template <typename Char, typename IDHandler> |
2419 | FMT_CONSTEXPR auto do_parse_arg_id(const Char* begin, const Char* end, |
2420 | IDHandler&& handler) -> const Char* { |
2421 | FMT_ASSERT(begin != end, "" ); |
2422 | Char c = *begin; |
2423 | if (c >= '0' && c <= '9') { |
2424 | int index = 0; |
2425 | if (c != '0') |
2426 | index = |
2427 | parse_nonnegative_int(begin, end, (std::numeric_limits<int>::max)()); |
2428 | else |
2429 | ++begin; |
2430 | if (begin == end || (*begin != '}' && *begin != ':')) |
2431 | handler.on_error("invalid format string" ); |
2432 | else |
2433 | handler(index); |
2434 | return begin; |
2435 | } |
2436 | if (!is_name_start(c)) { |
2437 | handler.on_error("invalid format string" ); |
2438 | return begin; |
2439 | } |
2440 | auto it = begin; |
2441 | do { |
2442 | ++it; |
2443 | } while (it != end && (is_name_start(c = *it) || ('0' <= c && c <= '9'))); |
2444 | handler(basic_string_view<Char>(begin, to_unsigned(it - begin))); |
2445 | return it; |
2446 | } |
2447 | |
2448 | template <typename Char, typename IDHandler> |
2449 | FMT_CONSTEXPR FMT_INLINE auto parse_arg_id(const Char* begin, const Char* end, |
2450 | IDHandler&& handler) -> const Char* { |
2451 | Char c = *begin; |
2452 | if (c != '}' && c != ':') return do_parse_arg_id(begin, end, handler); |
2453 | handler(); |
2454 | return begin; |
2455 | } |
2456 | |
2457 | template <typename Char, typename Handler> |
2458 | FMT_CONSTEXPR auto parse_width(const Char* begin, const Char* end, |
2459 | Handler&& handler) -> const Char* { |
2460 | using detail::auto_id; |
2461 | struct width_adapter { |
2462 | Handler& handler; |
2463 | |
2464 | FMT_CONSTEXPR void operator()() { handler.on_dynamic_width(auto_id()); } |
2465 | FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_width(id); } |
2466 | FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
2467 | handler.on_dynamic_width(id); |
2468 | } |
2469 | FMT_CONSTEXPR void on_error(const char* message) { |
2470 | if (message) handler.on_error(message); |
2471 | } |
2472 | }; |
2473 | |
2474 | FMT_ASSERT(begin != end, "" ); |
2475 | if ('0' <= *begin && *begin <= '9') { |
2476 | int width = parse_nonnegative_int(begin, end, -1); |
2477 | if (width != -1) |
2478 | handler.on_width(width); |
2479 | else |
2480 | handler.on_error("number is too big" ); |
2481 | } else if (*begin == '{') { |
2482 | ++begin; |
2483 | if (begin != end) begin = parse_arg_id(begin, end, width_adapter{handler}); |
2484 | if (begin == end || *begin != '}') |
2485 | return handler.on_error("invalid format string" ), begin; |
2486 | ++begin; |
2487 | } |
2488 | return begin; |
2489 | } |
2490 | |
2491 | template <typename Char, typename Handler> |
2492 | FMT_CONSTEXPR auto parse_precision(const Char* begin, const Char* end, |
2493 | Handler&& handler) -> const Char* { |
2494 | using detail::auto_id; |
2495 | struct precision_adapter { |
2496 | Handler& handler; |
2497 | |
2498 | FMT_CONSTEXPR void operator()() { handler.on_dynamic_precision(auto_id()); } |
2499 | FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_precision(id); } |
2500 | FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
2501 | handler.on_dynamic_precision(id); |
2502 | } |
2503 | FMT_CONSTEXPR void on_error(const char* message) { |
2504 | if (message) handler.on_error(message); |
2505 | } |
2506 | }; |
2507 | |
2508 | ++begin; |
2509 | auto c = begin != end ? *begin : Char(); |
2510 | if ('0' <= c && c <= '9') { |
2511 | auto precision = parse_nonnegative_int(begin, end, -1); |
2512 | if (precision != -1) |
2513 | handler.on_precision(precision); |
2514 | else |
2515 | handler.on_error("number is too big" ); |
2516 | } else if (c == '{') { |
2517 | ++begin; |
2518 | if (begin != end) |
2519 | begin = parse_arg_id(begin, end, precision_adapter{handler}); |
2520 | if (begin == end || *begin++ != '}') |
2521 | return handler.on_error("invalid format string" ), begin; |
2522 | } else { |
2523 | return handler.on_error("missing precision specifier" ), begin; |
2524 | } |
2525 | handler.end_precision(); |
2526 | return begin; |
2527 | } |
2528 | |
2529 | template <typename Char> |
2530 | FMT_CONSTEXPR auto parse_presentation_type(Char type) -> presentation_type { |
2531 | switch (to_ascii(type)) { |
2532 | case 'd': |
2533 | return presentation_type::dec; |
2534 | case 'o': |
2535 | return presentation_type::oct; |
2536 | case 'x': |
2537 | return presentation_type::hex_lower; |
2538 | case 'X': |
2539 | return presentation_type::hex_upper; |
2540 | case 'b': |
2541 | return presentation_type::bin_lower; |
2542 | case 'B': |
2543 | return presentation_type::bin_upper; |
2544 | case 'a': |
2545 | return presentation_type::hexfloat_lower; |
2546 | case 'A': |
2547 | return presentation_type::hexfloat_upper; |
2548 | case 'e': |
2549 | return presentation_type::exp_lower; |
2550 | case 'E': |
2551 | return presentation_type::exp_upper; |
2552 | case 'f': |
2553 | return presentation_type::fixed_lower; |
2554 | case 'F': |
2555 | return presentation_type::fixed_upper; |
2556 | case 'g': |
2557 | return presentation_type::general_lower; |
2558 | case 'G': |
2559 | return presentation_type::general_upper; |
2560 | case 'c': |
2561 | return presentation_type::chr; |
2562 | case 's': |
2563 | return presentation_type::string; |
2564 | case 'p': |
2565 | return presentation_type::pointer; |
2566 | case '?': |
2567 | return presentation_type::debug; |
2568 | default: |
2569 | return presentation_type::none; |
2570 | } |
2571 | } |
2572 | |
2573 | // Parses standard format specifiers and sends notifications about parsed |
2574 | // components to handler. |
2575 | template <typename Char, typename SpecHandler> |
2576 | FMT_CONSTEXPR FMT_INLINE auto parse_format_specs(const Char* begin, |
2577 | const Char* end, |
2578 | SpecHandler&& handler) |
2579 | -> const Char* { |
2580 | if (1 < end - begin && begin[1] == '}' && is_ascii_letter(*begin) && |
2581 | *begin != 'L') { |
2582 | presentation_type type = parse_presentation_type(*begin++); |
2583 | if (type == presentation_type::none) |
2584 | handler.on_error("invalid type specifier" ); |
2585 | handler.on_type(type); |
2586 | return begin; |
2587 | } |
2588 | |
2589 | if (begin == end) return begin; |
2590 | |
2591 | begin = parse_align(begin, end, handler); |
2592 | if (begin == end) return begin; |
2593 | |
2594 | // Parse sign. |
2595 | switch (to_ascii(*begin)) { |
2596 | case '+': |
2597 | handler.on_sign(sign::plus); |
2598 | ++begin; |
2599 | break; |
2600 | case '-': |
2601 | handler.on_sign(sign::minus); |
2602 | ++begin; |
2603 | break; |
2604 | case ' ': |
2605 | handler.on_sign(sign::space); |
2606 | ++begin; |
2607 | break; |
2608 | default: |
2609 | break; |
2610 | } |
2611 | if (begin == end) return begin; |
2612 | |
2613 | if (*begin == '#') { |
2614 | handler.on_hash(); |
2615 | if (++begin == end) return begin; |
2616 | } |
2617 | |
2618 | // Parse zero flag. |
2619 | if (*begin == '0') { |
2620 | handler.on_zero(); |
2621 | if (++begin == end) return begin; |
2622 | } |
2623 | |
2624 | begin = parse_width(begin, end, handler); |
2625 | if (begin == end) return begin; |
2626 | |
2627 | // Parse precision. |
2628 | if (*begin == '.') { |
2629 | begin = parse_precision(begin, end, handler); |
2630 | if (begin == end) return begin; |
2631 | } |
2632 | |
2633 | if (*begin == 'L') { |
2634 | handler.on_localized(); |
2635 | ++begin; |
2636 | } |
2637 | |
2638 | // Parse type. |
2639 | if (begin != end && *begin != '}') { |
2640 | presentation_type type = parse_presentation_type(*begin++); |
2641 | if (type == presentation_type::none) |
2642 | handler.on_error("invalid type specifier" ); |
2643 | handler.on_type(type); |
2644 | } |
2645 | return begin; |
2646 | } |
2647 | |
2648 | template <typename Char, typename Handler> |
2649 | FMT_CONSTEXPR auto parse_replacement_field(const Char* begin, const Char* end, |
2650 | Handler&& handler) -> const Char* { |
2651 | struct id_adapter { |
2652 | Handler& handler; |
2653 | int arg_id; |
2654 | |
2655 | FMT_CONSTEXPR void operator()() { arg_id = handler.on_arg_id(); } |
2656 | FMT_CONSTEXPR void operator()(int id) { arg_id = handler.on_arg_id(id); } |
2657 | FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
2658 | arg_id = handler.on_arg_id(id); |
2659 | } |
2660 | FMT_CONSTEXPR void on_error(const char* message) { |
2661 | if (message) handler.on_error(message); |
2662 | } |
2663 | }; |
2664 | |
2665 | ++begin; |
2666 | if (begin == end) return handler.on_error("invalid format string" ), end; |
2667 | if (*begin == '}') { |
2668 | handler.on_replacement_field(handler.on_arg_id(), begin); |
2669 | } else if (*begin == '{') { |
2670 | handler.on_text(begin, begin + 1); |
2671 | } else { |
2672 | auto adapter = id_adapter{handler, 0}; |
2673 | begin = parse_arg_id(begin, end, adapter); |
2674 | Char c = begin != end ? *begin : Char(); |
2675 | if (c == '}') { |
2676 | handler.on_replacement_field(adapter.arg_id, begin); |
2677 | } else if (c == ':') { |
2678 | begin = handler.on_format_specs(adapter.arg_id, begin + 1, end); |
2679 | if (begin == end || *begin != '}') |
2680 | return handler.on_error("unknown format specifier" ), end; |
2681 | } else { |
2682 | return handler.on_error("missing '}' in format string" ), end; |
2683 | } |
2684 | } |
2685 | return begin + 1; |
2686 | } |
2687 | |
2688 | template <bool IS_CONSTEXPR, typename Char, typename Handler> |
2689 | FMT_CONSTEXPR FMT_INLINE void parse_format_string( |
2690 | basic_string_view<Char> format_str, Handler&& handler) { |
2691 | // Workaround a name-lookup bug in MSVC's modules implementation. |
2692 | using detail::find; |
2693 | |
2694 | auto begin = format_str.data(); |
2695 | auto end = begin + format_str.size(); |
2696 | if (end - begin < 32) { |
2697 | // Use a simple loop instead of memchr for small strings. |
2698 | const Char* p = begin; |
2699 | while (p != end) { |
2700 | auto c = *p++; |
2701 | if (c == '{') { |
2702 | handler.on_text(begin, p - 1); |
2703 | begin = p = parse_replacement_field(p - 1, end, handler); |
2704 | } else if (c == '}') { |
2705 | if (p == end || *p != '}') |
2706 | return handler.on_error("unmatched '}' in format string" ); |
2707 | handler.on_text(begin, p); |
2708 | begin = ++p; |
2709 | } |
2710 | } |
2711 | handler.on_text(begin, end); |
2712 | return; |
2713 | } |
2714 | struct writer { |
2715 | FMT_CONSTEXPR void operator()(const Char* from, const Char* to) { |
2716 | if (from == to) return; |
2717 | for (;;) { |
2718 | const Char* p = nullptr; |
2719 | if (!find<IS_CONSTEXPR>(from, to, Char('}'), p)) |
2720 | return handler_.on_text(from, to); |
2721 | ++p; |
2722 | if (p == to || *p != '}') |
2723 | return handler_.on_error("unmatched '}' in format string" ); |
2724 | handler_.on_text(from, p); |
2725 | from = p + 1; |
2726 | } |
2727 | } |
2728 | Handler& handler_; |
2729 | } write = {handler}; |
2730 | while (begin != end) { |
2731 | // Doing two passes with memchr (one for '{' and another for '}') is up to |
2732 | // 2.5x faster than the naive one-pass implementation on big format strings. |
2733 | const Char* p = begin; |
2734 | if (*begin != '{' && !find<IS_CONSTEXPR>(begin + 1, end, Char('{'), p)) |
2735 | return write(begin, end); |
2736 | write(begin, p); |
2737 | begin = parse_replacement_field(p, end, handler); |
2738 | } |
2739 | } |
2740 | |
2741 | template <typename T, bool = is_named_arg<T>::value> struct strip_named_arg { |
2742 | using type = T; |
2743 | }; |
2744 | template <typename T> struct strip_named_arg<T, true> { |
2745 | using type = remove_cvref_t<decltype(T::value)>; |
2746 | }; |
2747 | |
2748 | template <typename T, typename ParseContext> |
2749 | FMT_CONSTEXPR auto parse_format_specs(ParseContext& ctx) |
2750 | -> decltype(ctx.begin()) { |
2751 | using char_type = typename ParseContext::char_type; |
2752 | using context = buffer_context<char_type>; |
2753 | using stripped_type = typename strip_named_arg<T>::type; |
2754 | using mapped_type = conditional_t< |
2755 | mapped_type_constant<T, context>::value != type::custom_type, |
2756 | decltype(arg_mapper<context>().map(std::declval<const T&>())), |
2757 | stripped_type>; |
2758 | auto f = conditional_t<has_formatter<mapped_type, context>::value, |
2759 | formatter<mapped_type, char_type>, |
2760 | fallback_formatter<stripped_type, char_type>>(); |
2761 | return f.parse(ctx); |
2762 | } |
2763 | |
2764 | template <typename ErrorHandler> |
2765 | FMT_CONSTEXPR void check_int_type_spec(presentation_type type, |
2766 | ErrorHandler&& eh) { |
2767 | if (type > presentation_type::bin_upper && type != presentation_type::chr) |
2768 | eh.on_error("invalid type specifier" ); |
2769 | } |
2770 | |
2771 | // Checks char specs and returns true if the type spec is char (and not int). |
2772 | template <typename Char, typename ErrorHandler = error_handler> |
2773 | FMT_CONSTEXPR auto check_char_specs(const basic_format_specs<Char>& specs, |
2774 | ErrorHandler&& eh = {}) -> bool { |
2775 | if (specs.type != presentation_type::none && |
2776 | specs.type != presentation_type::chr && |
2777 | specs.type != presentation_type::debug) { |
2778 | check_int_type_spec(specs.type, eh); |
2779 | return false; |
2780 | } |
2781 | if (specs.align == align::numeric || specs.sign != sign::none || specs.alt) |
2782 | eh.on_error("invalid format specifier for char" ); |
2783 | return true; |
2784 | } |
2785 | |
2786 | // A floating-point presentation format. |
2787 | enum class float_format : unsigned char { |
2788 | general, // General: exponent notation or fixed point based on magnitude. |
2789 | exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3. |
2790 | fixed, // Fixed point with the default precision of 6, e.g. 0.0012. |
2791 | hex |
2792 | }; |
2793 | |
2794 | struct float_specs { |
2795 | int precision; |
2796 | float_format format : 8; |
2797 | sign_t sign : 8; |
2798 | bool upper : 1; |
2799 | bool locale : 1; |
2800 | bool binary32 : 1; |
2801 | bool showpoint : 1; |
2802 | }; |
2803 | |
2804 | template <typename ErrorHandler = error_handler, typename Char> |
2805 | FMT_CONSTEXPR auto parse_float_type_spec(const basic_format_specs<Char>& specs, |
2806 | ErrorHandler&& eh = {}) |
2807 | -> float_specs { |
2808 | auto result = float_specs(); |
2809 | result.showpoint = specs.alt; |
2810 | result.locale = specs.localized; |
2811 | switch (specs.type) { |
2812 | case presentation_type::none: |
2813 | result.format = float_format::general; |
2814 | break; |
2815 | case presentation_type::general_upper: |
2816 | result.upper = true; |
2817 | FMT_FALLTHROUGH; |
2818 | case presentation_type::general_lower: |
2819 | result.format = float_format::general; |
2820 | break; |
2821 | case presentation_type::exp_upper: |
2822 | result.upper = true; |
2823 | FMT_FALLTHROUGH; |
2824 | case presentation_type::exp_lower: |
2825 | result.format = float_format::exp; |
2826 | result.showpoint |= specs.precision != 0; |
2827 | break; |
2828 | case presentation_type::fixed_upper: |
2829 | result.upper = true; |
2830 | FMT_FALLTHROUGH; |
2831 | case presentation_type::fixed_lower: |
2832 | result.format = float_format::fixed; |
2833 | result.showpoint |= specs.precision != 0; |
2834 | break; |
2835 | case presentation_type::hexfloat_upper: |
2836 | result.upper = true; |
2837 | FMT_FALLTHROUGH; |
2838 | case presentation_type::hexfloat_lower: |
2839 | result.format = float_format::hex; |
2840 | break; |
2841 | default: |
2842 | eh.on_error("invalid type specifier" ); |
2843 | break; |
2844 | } |
2845 | return result; |
2846 | } |
2847 | |
2848 | template <typename ErrorHandler = error_handler> |
2849 | FMT_CONSTEXPR auto check_cstring_type_spec(presentation_type type, |
2850 | ErrorHandler&& eh = {}) -> bool { |
2851 | if (type == presentation_type::none || type == presentation_type::string || |
2852 | type == presentation_type::debug) |
2853 | return true; |
2854 | if (type != presentation_type::pointer) eh.on_error("invalid type specifier" ); |
2855 | return false; |
2856 | } |
2857 | |
2858 | template <typename ErrorHandler = error_handler> |
2859 | FMT_CONSTEXPR void check_string_type_spec(presentation_type type, |
2860 | ErrorHandler&& eh = {}) { |
2861 | if (type != presentation_type::none && type != presentation_type::string && |
2862 | type != presentation_type::debug) |
2863 | eh.on_error("invalid type specifier" ); |
2864 | } |
2865 | |
2866 | template <typename ErrorHandler> |
2867 | FMT_CONSTEXPR void check_pointer_type_spec(presentation_type type, |
2868 | ErrorHandler&& eh) { |
2869 | if (type != presentation_type::none && type != presentation_type::pointer) |
2870 | eh.on_error("invalid type specifier" ); |
2871 | } |
2872 | |
2873 | // A parse_format_specs handler that checks if specifiers are consistent with |
2874 | // the argument type. |
2875 | template <typename Handler> class specs_checker : public Handler { |
2876 | private: |
2877 | detail::type arg_type_; |
2878 | |
2879 | FMT_CONSTEXPR void require_numeric_argument() { |
2880 | if (!is_arithmetic_type(arg_type_)) |
2881 | this->on_error("format specifier requires numeric argument" ); |
2882 | } |
2883 | |
2884 | public: |
2885 | FMT_CONSTEXPR specs_checker(const Handler& handler, detail::type arg_type) |
2886 | : Handler(handler), arg_type_(arg_type) {} |
2887 | |
2888 | FMT_CONSTEXPR void on_align(align_t align) { |
2889 | if (align == align::numeric) require_numeric_argument(); |
2890 | Handler::on_align(align); |
2891 | } |
2892 | |
2893 | FMT_CONSTEXPR void on_sign(sign_t s) { |
2894 | require_numeric_argument(); |
2895 | if (is_integral_type(arg_type_) && arg_type_ != type::int_type && |
2896 | arg_type_ != type::long_long_type && arg_type_ != type::int128_type && |
2897 | arg_type_ != type::char_type) { |
2898 | this->on_error("format specifier requires signed argument" ); |
2899 | } |
2900 | Handler::on_sign(s); |
2901 | } |
2902 | |
2903 | FMT_CONSTEXPR void on_hash() { |
2904 | require_numeric_argument(); |
2905 | Handler::on_hash(); |
2906 | } |
2907 | |
2908 | FMT_CONSTEXPR void on_localized() { |
2909 | require_numeric_argument(); |
2910 | Handler::on_localized(); |
2911 | } |
2912 | |
2913 | FMT_CONSTEXPR void on_zero() { |
2914 | require_numeric_argument(); |
2915 | Handler::on_zero(); |
2916 | } |
2917 | |
2918 | FMT_CONSTEXPR void end_precision() { |
2919 | if (is_integral_type(arg_type_) || arg_type_ == type::pointer_type) |
2920 | this->on_error("precision not allowed for this argument type" ); |
2921 | } |
2922 | }; |
2923 | |
2924 | constexpr int invalid_arg_index = -1; |
2925 | |
2926 | #if FMT_USE_NONTYPE_TEMPLATE_ARGS |
2927 | template <int N, typename T, typename... Args, typename Char> |
2928 | constexpr auto get_arg_index_by_name(basic_string_view<Char> name) -> int { |
2929 | if constexpr (detail::is_statically_named_arg<T>()) { |
2930 | if (name == T::name) return N; |
2931 | } |
2932 | if constexpr (sizeof...(Args) > 0) |
2933 | return get_arg_index_by_name<N + 1, Args...>(name); |
2934 | (void)name; // Workaround an MSVC bug about "unused" parameter. |
2935 | return invalid_arg_index; |
2936 | } |
2937 | #endif |
2938 | |
2939 | template <typename... Args, typename Char> |
2940 | FMT_CONSTEXPR auto get_arg_index_by_name(basic_string_view<Char> name) -> int { |
2941 | #if FMT_USE_NONTYPE_TEMPLATE_ARGS |
2942 | if constexpr (sizeof...(Args) > 0) |
2943 | return get_arg_index_by_name<0, Args...>(name); |
2944 | #endif |
2945 | (void)name; |
2946 | return invalid_arg_index; |
2947 | } |
2948 | |
2949 | template <typename Char, typename ErrorHandler, typename... Args> |
2950 | class format_string_checker { |
2951 | private: |
2952 | // In the future basic_format_parse_context will replace compile_parse_context |
2953 | // here and will use is_constant_evaluated and downcasting to access the data |
2954 | // needed for compile-time checks: https://godbolt.org/z/GvWzcTjh1. |
2955 | using parse_context_type = compile_parse_context<Char, ErrorHandler>; |
2956 | static constexpr int num_args = sizeof...(Args); |
2957 | |
2958 | // Format specifier parsing function. |
2959 | using parse_func = const Char* (*)(parse_context_type&); |
2960 | |
2961 | parse_context_type context_; |
2962 | parse_func parse_funcs_[num_args > 0 ? static_cast<size_t>(num_args) : 1]; |
2963 | type types_[num_args > 0 ? static_cast<size_t>(num_args) : 1]; |
2964 | |
2965 | public: |
2966 | explicit FMT_CONSTEXPR format_string_checker( |
2967 | basic_string_view<Char> format_str, ErrorHandler eh) |
2968 | : context_(format_str, num_args, types_, eh), |
2969 | parse_funcs_{&parse_format_specs<Args, parse_context_type>...}, |
2970 | types_{ |
2971 | mapped_type_constant<Args, |
2972 | basic_format_context<Char*, Char>>::value...} { |
2973 | } |
2974 | |
2975 | FMT_CONSTEXPR void on_text(const Char*, const Char*) {} |
2976 | |
2977 | FMT_CONSTEXPR auto on_arg_id() -> int { return context_.next_arg_id(); } |
2978 | FMT_CONSTEXPR auto on_arg_id(int id) -> int { |
2979 | return context_.check_arg_id(id), id; |
2980 | } |
2981 | FMT_CONSTEXPR auto on_arg_id(basic_string_view<Char> id) -> int { |
2982 | #if FMT_USE_NONTYPE_TEMPLATE_ARGS |
2983 | auto index = get_arg_index_by_name<Args...>(id); |
2984 | if (index == invalid_arg_index) on_error("named argument is not found" ); |
2985 | return context_.check_arg_id(index), index; |
2986 | #else |
2987 | (void)id; |
2988 | on_error("compile-time checks for named arguments require C++20 support" ); |
2989 | return 0; |
2990 | #endif |
2991 | } |
2992 | |
2993 | FMT_CONSTEXPR void on_replacement_field(int, const Char*) {} |
2994 | |
2995 | FMT_CONSTEXPR auto on_format_specs(int id, const Char* begin, const Char*) |
2996 | -> const Char* { |
2997 | context_.advance_to(context_.begin() + (begin - &*context_.begin())); |
2998 | // id >= 0 check is a workaround for gcc 10 bug (#2065). |
2999 | return id >= 0 && id < num_args ? parse_funcs_[id](context_) : begin; |
3000 | } |
3001 | |
3002 | FMT_CONSTEXPR void on_error(const char* message) { |
3003 | context_.on_error(message); |
3004 | } |
3005 | }; |
3006 | |
3007 | // Reports a compile-time error if S is not a valid format string. |
3008 | template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)> |
3009 | FMT_INLINE void check_format_string(const S&) { |
3010 | #ifdef FMT_ENFORCE_COMPILE_STRING |
3011 | static_assert(is_compile_string<S>::value, |
3012 | "FMT_ENFORCE_COMPILE_STRING requires all format strings to use " |
3013 | "FMT_STRING." ); |
3014 | #endif |
3015 | } |
3016 | template <typename... Args, typename S, |
3017 | FMT_ENABLE_IF(is_compile_string<S>::value)> |
3018 | void check_format_string(S format_str) { |
3019 | FMT_CONSTEXPR auto s = basic_string_view<typename S::char_type>(format_str); |
3020 | using checker = format_string_checker<typename S::char_type, error_handler, |
3021 | remove_cvref_t<Args>...>; |
3022 | FMT_CONSTEXPR bool invalid_format = |
3023 | (parse_format_string<true>(s, checker(s, {})), true); |
3024 | ignore_unused(invalid_format); |
3025 | } |
3026 | |
3027 | // Don't use type_identity for args to simplify symbols. |
3028 | template <typename Char> |
3029 | void vformat_to(buffer<Char>& buf, basic_string_view<Char> fmt, |
3030 | basic_format_args<FMT_BUFFER_CONTEXT(Char)> args, |
3031 | locale_ref loc = {}); |
3032 | |
3033 | FMT_API void vprint_mojibake(std::FILE*, string_view, format_args); |
3034 | #ifndef _WIN32 |
3035 | inline void vprint_mojibake(std::FILE*, string_view, format_args) {} |
3036 | #endif |
3037 | FMT_END_DETAIL_NAMESPACE |
3038 | |
3039 | // A formatter specialization for the core types corresponding to detail::type |
3040 | // constants. |
3041 | template <typename T, typename Char> |
3042 | struct formatter<T, Char, |
3043 | enable_if_t<detail::type_constant<T, Char>::value != |
3044 | detail::type::custom_type>> { |
3045 | private: |
3046 | detail::dynamic_format_specs<Char> specs_; |
3047 | |
3048 | public: |
3049 | // Parses format specifiers stopping either at the end of the range or at the |
3050 | // terminating '}'. |
3051 | template <typename ParseContext> |
3052 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
3053 | auto begin = ctx.begin(), end = ctx.end(); |
3054 | if (begin == end) return begin; |
3055 | using handler_type = detail::dynamic_specs_handler<ParseContext>; |
3056 | auto type = detail::type_constant<T, Char>::value; |
3057 | auto checker = |
3058 | detail::specs_checker<handler_type>(handler_type(specs_, ctx), type); |
3059 | auto it = detail::parse_format_specs(begin, end, checker); |
3060 | auto eh = ctx.error_handler(); |
3061 | switch (type) { |
3062 | case detail::type::none_type: |
3063 | FMT_ASSERT(false, "invalid argument type" ); |
3064 | break; |
3065 | case detail::type::bool_type: |
3066 | if (specs_.type == presentation_type::none || |
3067 | specs_.type == presentation_type::string) { |
3068 | break; |
3069 | } |
3070 | FMT_FALLTHROUGH; |
3071 | case detail::type::int_type: |
3072 | case detail::type::uint_type: |
3073 | case detail::type::long_long_type: |
3074 | case detail::type::ulong_long_type: |
3075 | case detail::type::int128_type: |
3076 | case detail::type::uint128_type: |
3077 | detail::check_int_type_spec(specs_.type, eh); |
3078 | break; |
3079 | case detail::type::char_type: |
3080 | detail::check_char_specs(specs_, eh); |
3081 | break; |
3082 | case detail::type::float_type: |
3083 | if (detail::const_check(FMT_USE_FLOAT)) |
3084 | detail::parse_float_type_spec(specs_, eh); |
3085 | else |
3086 | FMT_ASSERT(false, "float support disabled" ); |
3087 | break; |
3088 | case detail::type::double_type: |
3089 | if (detail::const_check(FMT_USE_DOUBLE)) |
3090 | detail::parse_float_type_spec(specs_, eh); |
3091 | else |
3092 | FMT_ASSERT(false, "double support disabled" ); |
3093 | break; |
3094 | case detail::type::long_double_type: |
3095 | if (detail::const_check(FMT_USE_LONG_DOUBLE)) |
3096 | detail::parse_float_type_spec(specs_, eh); |
3097 | else |
3098 | FMT_ASSERT(false, "long double support disabled" ); |
3099 | break; |
3100 | case detail::type::cstring_type: |
3101 | detail::check_cstring_type_spec(specs_.type, eh); |
3102 | break; |
3103 | case detail::type::string_type: |
3104 | detail::check_string_type_spec(specs_.type, eh); |
3105 | break; |
3106 | case detail::type::pointer_type: |
3107 | detail::check_pointer_type_spec(specs_.type, eh); |
3108 | break; |
3109 | case detail::type::custom_type: |
3110 | // Custom format specifiers are checked in parse functions of |
3111 | // formatter specializations. |
3112 | break; |
3113 | } |
3114 | return it; |
3115 | } |
3116 | |
3117 | template <detail::type U = detail::type_constant<T, Char>::value, |
3118 | enable_if_t<(U == detail::type::string_type || |
3119 | U == detail::type::cstring_type || |
3120 | U == detail::type::char_type), |
3121 | int> = 0> |
3122 | FMT_CONSTEXPR void set_debug_format() { |
3123 | specs_.type = presentation_type::debug; |
3124 | } |
3125 | |
3126 | template <typename FormatContext> |
3127 | FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const |
3128 | -> decltype(ctx.out()); |
3129 | }; |
3130 | |
3131 | #define FMT_FORMAT_AS(Type, Base) \ |
3132 | template <typename Char> \ |
3133 | struct formatter<Type, Char> : formatter<Base, Char> { \ |
3134 | template <typename FormatContext> \ |
3135 | auto format(Type const& val, FormatContext& ctx) const \ |
3136 | -> decltype(ctx.out()) { \ |
3137 | return formatter<Base, Char>::format(static_cast<Base>(val), ctx); \ |
3138 | } \ |
3139 | } |
3140 | |
3141 | FMT_FORMAT_AS(signed char, int); |
3142 | FMT_FORMAT_AS(unsigned char, unsigned); |
3143 | FMT_FORMAT_AS(short, int); |
3144 | FMT_FORMAT_AS(unsigned short, unsigned); |
3145 | FMT_FORMAT_AS(long, long long); |
3146 | FMT_FORMAT_AS(unsigned long, unsigned long long); |
3147 | FMT_FORMAT_AS(Char*, const Char*); |
3148 | FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>); |
3149 | FMT_FORMAT_AS(std::nullptr_t, const void*); |
3150 | FMT_FORMAT_AS(detail::std_string_view<Char>, basic_string_view<Char>); |
3151 | |
3152 | template <typename Char> struct basic_runtime { basic_string_view<Char> str; }; |
3153 | |
3154 | /** A compile-time format string. */ |
3155 | template <typename Char, typename... Args> class basic_format_string { |
3156 | private: |
3157 | basic_string_view<Char> str_; |
3158 | |
3159 | public: |
3160 | template <typename S, |
3161 | FMT_ENABLE_IF( |
3162 | std::is_convertible<const S&, basic_string_view<Char>>::value)> |
3163 | FMT_CONSTEVAL FMT_INLINE basic_format_string(const S& s) : str_(s) { |
3164 | static_assert( |
3165 | detail::count< |
3166 | (std::is_base_of<detail::view, remove_reference_t<Args>>::value && |
3167 | std::is_reference<Args>::value)...>() == 0, |
3168 | "passing views as lvalues is disallowed" ); |
3169 | #ifdef FMT_HAS_CONSTEVAL |
3170 | if constexpr (detail::count_named_args<Args...>() == |
3171 | detail::count_statically_named_args<Args...>()) { |
3172 | using checker = detail::format_string_checker<Char, detail::error_handler, |
3173 | remove_cvref_t<Args>...>; |
3174 | detail::parse_format_string<true>(str_, checker(s, {})); |
3175 | } |
3176 | #else |
3177 | detail::check_format_string<Args...>(s); |
3178 | #endif |
3179 | } |
3180 | basic_format_string(basic_runtime<Char> r) : str_(r.str) {} |
3181 | |
3182 | FMT_INLINE operator basic_string_view<Char>() const { return str_; } |
3183 | }; |
3184 | |
3185 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
3186 | // Workaround broken conversion on older gcc. |
3187 | template <typename...> using format_string = string_view; |
3188 | inline auto runtime(string_view s) -> string_view { return s; } |
3189 | #else |
3190 | template <typename... Args> |
3191 | using format_string = basic_format_string<char, type_identity_t<Args>...>; |
3192 | /** |
3193 | \rst |
3194 | Creates a runtime format string. |
3195 | |
3196 | **Example**:: |
3197 | |
3198 | // Check format string at runtime instead of compile-time. |
3199 | fmt::print(fmt::runtime("{:d}"), "I am not a number"); |
3200 | \endrst |
3201 | */ |
3202 | inline auto runtime(string_view s) -> basic_runtime<char> { return {{s}}; } |
3203 | #endif |
3204 | |
3205 | FMT_API auto vformat(string_view fmt, format_args args) -> std::string; |
3206 | |
3207 | /** |
3208 | \rst |
3209 | Formats ``args`` according to specifications in ``fmt`` and returns the result |
3210 | as a string. |
3211 | |
3212 | **Example**:: |
3213 | |
3214 | #include <fmt/core.h> |
3215 | std::string message = fmt::format("The answer is {}.", 42); |
3216 | \endrst |
3217 | */ |
3218 | template <typename... T> |
3219 | FMT_NODISCARD FMT_INLINE auto format(format_string<T...> fmt, T&&... args) |
3220 | -> std::string { |
3221 | return vformat(fmt, fmt::make_format_args(args...)); |
3222 | } |
3223 | |
3224 | /** Formats a string and writes the output to ``out``. */ |
3225 | template <typename OutputIt, |
3226 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3227 | auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt { |
3228 | auto&& buf = detail::get_buffer<char>(out); |
3229 | detail::vformat_to(buf, fmt, args, {}); |
3230 | return detail::get_iterator(buf, out); |
3231 | } |
3232 | |
3233 | /** |
3234 | \rst |
3235 | Formats ``args`` according to specifications in ``fmt``, writes the result to |
3236 | the output iterator ``out`` and returns the iterator past the end of the output |
3237 | range. `format_to` does not append a terminating null character. |
3238 | |
3239 | **Example**:: |
3240 | |
3241 | auto out = std::vector<char>(); |
3242 | fmt::format_to(std::back_inserter(out), "{}", 42); |
3243 | \endrst |
3244 | */ |
3245 | template <typename OutputIt, typename... T, |
3246 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3247 | FMT_INLINE auto format_to(OutputIt out, format_string<T...> fmt, T&&... args) |
3248 | -> OutputIt { |
3249 | return vformat_to(out, fmt, fmt::make_format_args(args...)); |
3250 | } |
3251 | |
3252 | template <typename OutputIt> struct format_to_n_result { |
3253 | /** Iterator past the end of the output range. */ |
3254 | OutputIt out; |
3255 | /** Total (not truncated) output size. */ |
3256 | size_t size; |
3257 | }; |
3258 | |
3259 | template <typename OutputIt, typename... T, |
3260 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3261 | auto vformat_to_n(OutputIt out, size_t n, string_view fmt, format_args args) |
3262 | -> format_to_n_result<OutputIt> { |
3263 | using traits = detail::fixed_buffer_traits; |
3264 | auto buf = detail::iterator_buffer<OutputIt, char, traits>(out, n); |
3265 | detail::vformat_to(buf, fmt, args, {}); |
3266 | return {buf.out(), buf.count()}; |
3267 | } |
3268 | |
3269 | /** |
3270 | \rst |
3271 | Formats ``args`` according to specifications in ``fmt``, writes up to ``n`` |
3272 | characters of the result to the output iterator ``out`` and returns the total |
3273 | (not truncated) output size and the iterator past the end of the output range. |
3274 | `format_to_n` does not append a terminating null character. |
3275 | \endrst |
3276 | */ |
3277 | template <typename OutputIt, typename... T, |
3278 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)> |
3279 | FMT_INLINE auto format_to_n(OutputIt out, size_t n, format_string<T...> fmt, |
3280 | T&&... args) -> format_to_n_result<OutputIt> { |
3281 | return vformat_to_n(out, n, fmt, fmt::make_format_args(args...)); |
3282 | } |
3283 | |
3284 | /** Returns the number of chars in the output of ``format(fmt, args...)``. */ |
3285 | template <typename... T> |
3286 | FMT_NODISCARD FMT_INLINE auto formatted_size(format_string<T...> fmt, |
3287 | T&&... args) -> size_t { |
3288 | auto buf = detail::counting_buffer<>(); |
3289 | detail::vformat_to(buf, string_view(fmt), |
3290 | format_args(fmt::make_format_args(args...)), {}); |
3291 | return buf.count(); |
3292 | } |
3293 | |
3294 | FMT_API void vprint(string_view fmt, format_args args); |
3295 | FMT_API void vprint(std::FILE* f, string_view fmt, format_args args); |
3296 | |
3297 | /** |
3298 | \rst |
3299 | Formats ``args`` according to specifications in ``fmt`` and writes the output |
3300 | to ``stdout``. |
3301 | |
3302 | **Example**:: |
3303 | |
3304 | fmt::print("Elapsed time: {0:.2f} seconds", 1.23); |
3305 | \endrst |
3306 | */ |
3307 | template <typename... T> |
3308 | FMT_INLINE void print(format_string<T...> fmt, T&&... args) { |
3309 | const auto& vargs = fmt::make_format_args(args...); |
3310 | return detail::is_utf8() ? vprint(fmt, vargs) |
3311 | : detail::vprint_mojibake(stdout, fmt, vargs); |
3312 | } |
3313 | |
3314 | /** |
3315 | \rst |
3316 | Formats ``args`` according to specifications in ``fmt`` and writes the |
3317 | output to the file ``f``. |
3318 | |
3319 | **Example**:: |
3320 | |
3321 | fmt::print(stderr, "Don't {}!", "panic"); |
3322 | \endrst |
3323 | */ |
3324 | template <typename... T> |
3325 | FMT_INLINE void print(std::FILE* f, format_string<T...> fmt, T&&... args) { |
3326 | const auto& vargs = fmt::make_format_args(args...); |
3327 | return detail::is_utf8() ? vprint(f, fmt, vargs) |
3328 | : detail::vprint_mojibake(f, fmt, vargs); |
3329 | } |
3330 | |
3331 | FMT_MODULE_EXPORT_END |
3332 | FMT_GCC_PRAGMA("GCC pop_options" ) |
3333 | FMT_END_NAMESPACE |
3334 | |
3335 | #ifdef FMT_HEADER_ONLY |
3336 | # include "format.h" |
3337 | #endif |
3338 | #endif // FMT_CORE_H_ |
3339 | |