1 // Formatting library for C++ - optional wchar_t and exotic character support 2 // 3 // Copyright (c) 2012 - present, Victor Zverovich 4 // All rights reserved. 5 // 6 // For the license information refer to format.h. 7 8 #ifndef FMT_XCHAR_H_ 9 #define FMT_XCHAR_H_ 10 11 #include <cwchar> 12 13 #include "format.h" 14 15 #ifndef FMT_STATIC_THOUSANDS_SEPARATOR 16 # include <locale> 17 #endif 18 19 FMT_BEGIN_NAMESPACE 20 namespace detail { 21 22 template <typename T> 23 using is_exotic_char = bool_constant<!std::is_same<T, char>::value>; 24 25 inline auto write_loc(std::back_insert_iterator<detail::buffer<wchar_t>> out, 26 loc_value value, const format_specs<wchar_t>& specs, 27 locale_ref loc) -> bool { 28 #ifndef FMT_STATIC_THOUSANDS_SEPARATOR 29 auto& numpunct = 30 std::use_facet<std::numpunct<wchar_t>>(loc.get<std::locale>()); 31 auto separator = std::wstring(); 32 auto grouping = numpunct.grouping(); 33 if (!grouping.empty()) separator = std::wstring(1, numpunct.thousands_sep()); 34 return value.visit(loc_writer<wchar_t>{out, specs, separator, grouping, {}}); 35 #endif 36 return false; 37 } 38 } // namespace detail 39 40 FMT_BEGIN_EXPORT 41 42 using wstring_view = basic_string_view<wchar_t>; 43 using wformat_parse_context = basic_format_parse_context<wchar_t>; 44 using wformat_context = buffer_context<wchar_t>; 45 using wformat_args = basic_format_args<wformat_context>; 46 using wmemory_buffer = basic_memory_buffer<wchar_t>; 47 48 #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 49 // Workaround broken conversion on older gcc. 50 template <typename... Args> using wformat_string = wstring_view; 51 inline auto runtime(wstring_view s) -> wstring_view { return s; } 52 #else 53 template <typename... Args> 54 using wformat_string = basic_format_string<wchar_t, type_identity_t<Args>...>; 55 inline auto runtime(wstring_view s) -> runtime_format_string<wchar_t> { 56 return {{s}}; 57 } 58 #endif 59 60 template <> struct is_char<wchar_t> : std::true_type {}; 61 template <> struct is_char<detail::char8_type> : std::true_type {}; 62 template <> struct is_char<char16_t> : std::true_type {}; 63 template <> struct is_char<char32_t> : std::true_type {}; 64 65 template <typename... T> 66 constexpr auto make_wformat_args(const T&... args) 67 -> format_arg_store<wformat_context, T...> { 68 return {args...}; 69 } 70 71 inline namespace literals { 72 #if FMT_USE_USER_DEFINED_LITERALS && !FMT_USE_NONTYPE_TEMPLATE_ARGS 73 constexpr auto operator""_a(const wchar_t* s, size_t) 74 -> detail::udl_arg<wchar_t> { 75 return {s}; 76 } 77 #endif 78 } // namespace literals 79 80 template <typename It, typename Sentinel> 81 auto join(It begin, Sentinel end, wstring_view sep) 82 -> join_view<It, Sentinel, wchar_t> { 83 return {begin, end, sep}; 84 } 85 86 template <typename Range> 87 auto join(Range&& range, wstring_view sep) 88 -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>, 89 wchar_t> { 90 return join(std::begin(range), std::end(range), sep); 91 } 92 93 template <typename T> 94 auto join(std::initializer_list<T> list, wstring_view sep) 95 -> join_view<const T*, const T*, wchar_t> { 96 return join(std::begin(list), std::end(list), sep); 97 } 98 99 template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)> 100 auto vformat(basic_string_view<Char> format_str, 101 basic_format_args<buffer_context<type_identity_t<Char>>> args) 102 -> std::basic_string<Char> { 103 auto buf = basic_memory_buffer<Char>(); 104 detail::vformat_to(buf, format_str, args); 105 return to_string(buf); 106 } 107 108 template <typename... T> 109 auto format(wformat_string<T...> fmt, T&&... args) -> std::wstring { 110 return vformat(fmt::wstring_view(fmt), fmt::make_wformat_args(args...)); 111 } 112 113 // Pass char_t as a default template parameter instead of using 114 // std::basic_string<char_t<S>> to reduce the symbol size. 115 template <typename S, typename... T, typename Char = char_t<S>, 116 FMT_ENABLE_IF(!std::is_same<Char, char>::value && 117 !std::is_same<Char, wchar_t>::value)> 118 auto format(const S& format_str, T&&... args) -> std::basic_string<Char> { 119 return vformat(detail::to_string_view(format_str), 120 fmt::make_format_args<buffer_context<Char>>(args...)); 121 } 122 123 template <typename Locale, typename S, typename Char = char_t<S>, 124 FMT_ENABLE_IF(detail::is_locale<Locale>::value&& 125 detail::is_exotic_char<Char>::value)> 126 inline auto vformat( 127 const Locale& loc, const S& format_str, 128 basic_format_args<buffer_context<type_identity_t<Char>>> args) 129 -> std::basic_string<Char> { 130 return detail::vformat(loc, detail::to_string_view(format_str), args); 131 } 132 133 template <typename Locale, typename S, typename... T, typename Char = char_t<S>, 134 FMT_ENABLE_IF(detail::is_locale<Locale>::value&& 135 detail::is_exotic_char<Char>::value)> 136 inline auto format(const Locale& loc, const S& format_str, T&&... args) 137 -> std::basic_string<Char> { 138 return detail::vformat(loc, detail::to_string_view(format_str), 139 fmt::make_format_args<buffer_context<Char>>(args...)); 140 } 141 142 template <typename OutputIt, typename S, typename Char = char_t<S>, 143 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& 144 detail::is_exotic_char<Char>::value)> 145 auto vformat_to(OutputIt out, const S& format_str, 146 basic_format_args<buffer_context<type_identity_t<Char>>> args) 147 -> OutputIt { 148 auto&& buf = detail::get_buffer<Char>(out); 149 detail::vformat_to(buf, detail::to_string_view(format_str), args); 150 return detail::get_iterator(buf, out); 151 } 152 153 template <typename OutputIt, typename S, typename... T, 154 typename Char = char_t<S>, 155 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& 156 detail::is_exotic_char<Char>::value)> 157 inline auto format_to(OutputIt out, const S& fmt, T&&... args) -> OutputIt { 158 return vformat_to(out, detail::to_string_view(fmt), 159 fmt::make_format_args<buffer_context<Char>>(args...)); 160 } 161 162 template <typename Locale, typename S, typename OutputIt, typename... Args, 163 typename Char = char_t<S>, 164 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& 165 detail::is_locale<Locale>::value&& 166 detail::is_exotic_char<Char>::value)> 167 inline auto vformat_to( 168 OutputIt out, const Locale& loc, const S& format_str, 169 basic_format_args<buffer_context<type_identity_t<Char>>> args) -> OutputIt { 170 auto&& buf = detail::get_buffer<Char>(out); 171 vformat_to(buf, detail::to_string_view(format_str), args, 172 detail::locale_ref(loc)); 173 return detail::get_iterator(buf, out); 174 } 175 176 template <typename OutputIt, typename Locale, typename S, typename... T, 177 typename Char = char_t<S>, 178 bool enable = detail::is_output_iterator<OutputIt, Char>::value && 179 detail::is_locale<Locale>::value && 180 detail::is_exotic_char<Char>::value> 181 inline auto format_to(OutputIt out, const Locale& loc, const S& format_str, 182 T&&... args) -> 183 typename std::enable_if<enable, OutputIt>::type { 184 return vformat_to(out, loc, detail::to_string_view(format_str), 185 fmt::make_format_args<buffer_context<Char>>(args...)); 186 } 187 188 template <typename OutputIt, typename Char, typename... Args, 189 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& 190 detail::is_exotic_char<Char>::value)> 191 inline auto vformat_to_n( 192 OutputIt out, size_t n, basic_string_view<Char> format_str, 193 basic_format_args<buffer_context<type_identity_t<Char>>> args) 194 -> format_to_n_result<OutputIt> { 195 using traits = detail::fixed_buffer_traits; 196 auto buf = detail::iterator_buffer<OutputIt, Char, traits>(out, n); 197 detail::vformat_to(buf, format_str, args); 198 return {buf.out(), buf.count()}; 199 } 200 201 template <typename OutputIt, typename S, typename... T, 202 typename Char = char_t<S>, 203 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& 204 detail::is_exotic_char<Char>::value)> 205 inline auto format_to_n(OutputIt out, size_t n, const S& fmt, T&&... args) 206 -> format_to_n_result<OutputIt> { 207 return vformat_to_n(out, n, detail::to_string_view(fmt), 208 fmt::make_format_args<buffer_context<Char>>(args...)); 209 } 210 211 template <typename S, typename... T, typename Char = char_t<S>, 212 FMT_ENABLE_IF(detail::is_exotic_char<Char>::value)> 213 inline auto formatted_size(const S& fmt, T&&... args) -> size_t { 214 auto buf = detail::counting_buffer<Char>(); 215 detail::vformat_to(buf, detail::to_string_view(fmt), 216 fmt::make_format_args<buffer_context<Char>>(args...)); 217 return buf.count(); 218 } 219 220 inline void vprint(std::FILE* f, wstring_view fmt, wformat_args args) { 221 auto buf = wmemory_buffer(); 222 detail::vformat_to(buf, fmt, args); 223 buf.push_back(L'\0'); 224 if (std::fputws(buf.data(), f) == -1) 225 FMT_THROW(system_error(errno, FMT_STRING("cannot write to file"))); 226 } 227 228 inline void vprint(wstring_view fmt, wformat_args args) { 229 vprint(stdout, fmt, args); 230 } 231 232 template <typename... T> 233 void print(std::FILE* f, wformat_string<T...> fmt, T&&... args) { 234 return vprint(f, wstring_view(fmt), fmt::make_wformat_args(args...)); 235 } 236 237 template <typename... T> void print(wformat_string<T...> fmt, T&&... args) { 238 return vprint(wstring_view(fmt), fmt::make_wformat_args(args...)); 239 } 240 241 template <typename... T> 242 void println(std::FILE* f, wformat_string<T...> fmt, T&&... args) { 243 return print(f, L"{}\n", fmt::format(fmt, std::forward<T>(args)...)); 244 } 245 246 template <typename... T> void println(wformat_string<T...> fmt, T&&... args) { 247 return print(L"{}\n", fmt::format(fmt, std::forward<T>(args)...)); 248 } 249 250 /** 251 Converts *value* to ``std::wstring`` using the default format for type *T*. 252 */ 253 template <typename T> inline auto to_wstring(const T& value) -> std::wstring { 254 return format(FMT_STRING(L"{}"), value); 255 } 256 FMT_END_EXPORT 257 FMT_END_NAMESPACE 258 259 #endif // FMT_XCHAR_H_ 260