| 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 | #include <tuple> |
| 13 | |
| 14 | #include "format.h" |
| 15 | |
| 16 | FMT_BEGIN_NAMESPACE |
| 17 | namespace detail { |
| 18 | template <typename T> |
| 19 | using is_exotic_char = bool_constant<!std::is_same<T, char>::value>; |
| 20 | } |
| 21 | |
| 22 | FMT_MODULE_EXPORT_BEGIN |
| 23 | |
| 24 | using wstring_view = basic_string_view<wchar_t>; |
| 25 | using wformat_parse_context = basic_format_parse_context<wchar_t>; |
| 26 | using wformat_context = buffer_context<wchar_t>; |
| 27 | using wformat_args = basic_format_args<wformat_context>; |
| 28 | using wmemory_buffer = basic_memory_buffer<wchar_t>; |
| 29 | |
| 30 | #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 |
| 31 | // Workaround broken conversion on older gcc. |
| 32 | template <typename... Args> using wformat_string = wstring_view; |
| 33 | #else |
| 34 | template <typename... Args> |
| 35 | using wformat_string = basic_format_string<wchar_t, type_identity_t<Args>...>; |
| 36 | #endif |
| 37 | |
| 38 | template <> struct is_char<wchar_t> : std::true_type {}; |
| 39 | template <> struct is_char<detail::char8_type> : std::true_type {}; |
| 40 | template <> struct is_char<char16_t> : std::true_type {}; |
| 41 | template <> struct is_char<char32_t> : std::true_type {}; |
| 42 | |
| 43 | template <typename... Args> |
| 44 | constexpr format_arg_store<wformat_context, Args...> make_wformat_args( |
| 45 | const Args&... args) { |
| 46 | return {args...}; |
| 47 | } |
| 48 | |
| 49 | inline namespace literals { |
| 50 | constexpr auto operator"" _format(const wchar_t* s, size_t n) |
| 51 | -> detail::udl_formatter<wchar_t> { |
| 52 | return {{s, n}}; |
| 53 | } |
| 54 | |
| 55 | #if FMT_USE_USER_DEFINED_LITERALS && !FMT_USE_NONTYPE_TEMPLATE_PARAMETERS |
| 56 | constexpr detail::udl_arg<wchar_t> operator"" _a(const wchar_t* s, size_t) { |
| 57 | return {s}; |
| 58 | } |
| 59 | #endif |
| 60 | } // namespace literals |
| 61 | |
| 62 | template <typename It, typename Sentinel> |
| 63 | auto join(It begin, Sentinel end, wstring_view sep) |
| 64 | -> join_view<It, Sentinel, wchar_t> { |
| 65 | return {begin, end, sep}; |
| 66 | } |
| 67 | |
| 68 | template <typename Range> |
| 69 | auto join(Range&& range, wstring_view sep) |
| 70 | -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>, |
| 71 | wchar_t> { |
| 72 | return join(std::begin(range), std::end(range), sep); |
| 73 | } |
| 74 | |
| 75 | template <typename T> |
| 76 | auto join(std::initializer_list<T> list, wstring_view sep) |
| 77 | -> join_view<const T*, const T*, wchar_t> { |
| 78 | return join(std::begin(list), std::end(list), sep); |
| 79 | } |
| 80 | |
| 81 | template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)> |
| 82 | auto vformat(basic_string_view<Char> format_str, |
| 83 | basic_format_args<buffer_context<type_identity_t<Char>>> args) |
| 84 | -> std::basic_string<Char> { |
| 85 | basic_memory_buffer<Char> buffer; |
| 86 | detail::vformat_to(buffer, format_str, args); |
| 87 | return to_string(buffer); |
| 88 | } |
| 89 | |
| 90 | // Pass char_t as a default template parameter instead of using |
| 91 | // std::basic_string<char_t<S>> to reduce the symbol size. |
| 92 | template <typename S, typename... Args, typename Char = char_t<S>, |
| 93 | FMT_ENABLE_IF(!std::is_same<Char, char>::value)> |
| 94 | auto format(const S& format_str, Args&&... args) -> std::basic_string<Char> { |
| 95 | const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...); |
| 96 | return vformat(to_string_view(format_str), vargs); |
| 97 | } |
| 98 | |
| 99 | template <typename Locale, typename S, typename Char = char_t<S>, |
| 100 | FMT_ENABLE_IF(detail::is_locale<Locale>::value&& |
| 101 | detail::is_exotic_char<Char>::value)> |
| 102 | inline auto vformat( |
| 103 | const Locale& loc, const S& format_str, |
| 104 | basic_format_args<buffer_context<type_identity_t<Char>>> args) |
| 105 | -> std::basic_string<Char> { |
| 106 | return detail::vformat(loc, to_string_view(format_str), args); |
| 107 | } |
| 108 | |
| 109 | template <typename Locale, typename S, typename... Args, |
| 110 | typename Char = char_t<S>, |
| 111 | FMT_ENABLE_IF(detail::is_locale<Locale>::value&& |
| 112 | detail::is_exotic_char<Char>::value)> |
| 113 | inline auto format(const Locale& loc, const S& format_str, Args&&... args) |
| 114 | -> std::basic_string<Char> { |
| 115 | return detail::vformat(loc, to_string_view(format_str), |
| 116 | fmt::make_args_checked<Args...>(format_str, args...)); |
| 117 | } |
| 118 | |
| 119 | template <typename OutputIt, typename S, typename Char = char_t<S>, |
| 120 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& |
| 121 | detail::is_exotic_char<Char>::value)> |
| 122 | auto vformat_to(OutputIt out, const S& format_str, |
| 123 | basic_format_args<buffer_context<type_identity_t<Char>>> args) |
| 124 | -> OutputIt { |
| 125 | auto&& buf = detail::get_buffer<Char>(out); |
| 126 | detail::vformat_to(buf, to_string_view(format_str), args); |
| 127 | return detail::get_iterator(buf); |
| 128 | } |
| 129 | |
| 130 | template <typename OutputIt, typename S, typename... Args, |
| 131 | typename Char = char_t<S>, |
| 132 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& |
| 133 | detail::is_exotic_char<Char>::value)> |
| 134 | inline auto format_to(OutputIt out, const S& fmt, Args&&... args) -> OutputIt { |
| 135 | const auto& vargs = fmt::make_args_checked<Args...>(fmt, args...); |
| 136 | return vformat_to(out, to_string_view(fmt), vargs); |
| 137 | } |
| 138 | |
| 139 | template <typename S, typename... Args, typename Char, size_t SIZE, |
| 140 | typename Allocator, FMT_ENABLE_IF(detail::is_string<S>::value)> |
| 141 | FMT_DEPRECATED auto format_to(basic_memory_buffer<Char, SIZE, Allocator>& buf, |
| 142 | const S& format_str, Args&&... args) -> |
| 143 | typename buffer_context<Char>::iterator { |
| 144 | const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...); |
| 145 | detail::vformat_to(buf, to_string_view(format_str), vargs, {}); |
| 146 | return detail::buffer_appender<Char>(buf); |
| 147 | } |
| 148 | |
| 149 | template <typename Locale, typename S, typename OutputIt, typename... Args, |
| 150 | typename Char = char_t<S>, |
| 151 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& |
| 152 | detail::is_locale<Locale>::value&& |
| 153 | detail::is_exotic_char<Char>::value)> |
| 154 | inline auto vformat_to( |
| 155 | OutputIt out, const Locale& loc, const S& format_str, |
| 156 | basic_format_args<buffer_context<type_identity_t<Char>>> args) -> OutputIt { |
| 157 | auto&& buf = detail::get_buffer<Char>(out); |
| 158 | vformat_to(buf, to_string_view(format_str), args, detail::locale_ref(loc)); |
| 159 | return detail::get_iterator(buf); |
| 160 | } |
| 161 | |
| 162 | template < |
| 163 | typename OutputIt, typename Locale, typename S, typename... Args, |
| 164 | typename Char = char_t<S>, |
| 165 | bool enable = detail::is_output_iterator<OutputIt, Char>::value&& |
| 166 | detail::is_locale<Locale>::value&& detail::is_exotic_char<Char>::value> |
| 167 | inline auto format_to(OutputIt out, const Locale& loc, const S& format_str, |
| 168 | Args&&... args) -> |
| 169 | typename std::enable_if<enable, OutputIt>::type { |
| 170 | const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...); |
| 171 | return vformat_to(out, loc, to_string_view(format_str), vargs); |
| 172 | } |
| 173 | |
| 174 | template <typename OutputIt, typename Char, typename... Args, |
| 175 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& |
| 176 | detail::is_exotic_char<Char>::value)> |
| 177 | inline auto vformat_to_n( |
| 178 | OutputIt out, size_t n, basic_string_view<Char> format_str, |
| 179 | basic_format_args<buffer_context<type_identity_t<Char>>> args) |
| 180 | -> format_to_n_result<OutputIt> { |
| 181 | detail::iterator_buffer<OutputIt, Char, detail::fixed_buffer_traits> buf(out, |
| 182 | n); |
| 183 | detail::vformat_to(buf, format_str, args); |
| 184 | return {buf.out(), buf.count()}; |
| 185 | } |
| 186 | |
| 187 | template <typename OutputIt, typename S, typename... Args, |
| 188 | typename Char = char_t<S>, |
| 189 | FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& |
| 190 | detail::is_exotic_char<Char>::value)> |
| 191 | inline auto format_to_n(OutputIt out, size_t n, const S& fmt, |
| 192 | const Args&... args) -> format_to_n_result<OutputIt> { |
| 193 | const auto& vargs = fmt::make_args_checked<Args...>(fmt, args...); |
| 194 | return vformat_to_n(out, n, to_string_view(fmt), vargs); |
| 195 | } |
| 196 | |
| 197 | template <typename S, typename... Args, typename Char = char_t<S>, |
| 198 | FMT_ENABLE_IF(detail::is_exotic_char<Char>::value)> |
| 199 | inline auto formatted_size(const S& fmt, Args&&... args) -> size_t { |
| 200 | detail::counting_buffer<Char> buf; |
| 201 | const auto& vargs = fmt::make_args_checked<Args...>(fmt, args...); |
| 202 | detail::vformat_to(buf, to_string_view(fmt), vargs); |
| 203 | return buf.count(); |
| 204 | } |
| 205 | |
| 206 | inline void vprint(std::FILE* f, wstring_view fmt, wformat_args args) { |
| 207 | wmemory_buffer buffer; |
| 208 | detail::vformat_to(buffer, fmt, args); |
| 209 | buffer.push_back(L'\0'); |
| 210 | if (std::fputws(buffer.data(), f) == -1) |
| 211 | FMT_THROW(system_error(errno, FMT_STRING("cannot write to file"))); |
| 212 | } |
| 213 | |
| 214 | inline void vprint(wstring_view fmt, wformat_args args) { |
| 215 | vprint(stdout, fmt, args); |
| 216 | } |
| 217 | |
| 218 | template <typename... T> |
| 219 | void print(std::FILE* f, wformat_string<T...> fmt, T&&... args) { |
| 220 | return vprint(f, wstring_view(fmt), fmt::make_wformat_args(args...)); |
| 221 | } |
| 222 | |
| 223 | template <typename... T> void print(wformat_string<T...> fmt, T&&... args) { |
| 224 | return vprint(wstring_view(fmt), fmt::make_wformat_args(args...)); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | Converts *value* to ``std::wstring`` using the default format for type *T*. |
| 229 | */ |
| 230 | template <typename T> inline auto to_wstring(const T& value) -> std::wstring { |
| 231 | return format(FMT_STRING(L"{}"), value); |
| 232 | } |
| 233 | FMT_MODULE_EXPORT_END |
| 234 | FMT_END_NAMESPACE |
| 235 | |
| 236 | #endif // FMT_XCHAR_H_ |