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1 | // Formatting library for C++ - formatters for standard library types |
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_STD_H_ | |
9 | #define FMT_STD_H_ | |
10 | ||
11 | #include <thread> | |
12 | #include <type_traits> | |
13 | #include <utility> | |
14 | ||
15 | #include "ostream.h" | |
16 | ||
17 | #if FMT_HAS_INCLUDE(<version>) | |
18 | # include <version> | |
19 | #endif | |
20 | // Checking FMT_CPLUSPLUS for warning suppression in MSVC. | |
21 | #if FMT_CPLUSPLUS >= 201703L | |
22 | # if FMT_HAS_INCLUDE(<filesystem>) | |
23 | # include <filesystem> | |
24 | # endif | |
25 | # if FMT_HAS_INCLUDE(<variant>) | |
26 | # include <variant> | |
27 | # endif | |
28 | #endif | |
29 | ||
30 | #ifdef __cpp_lib_filesystem | |
31 | FMT_BEGIN_NAMESPACE | |
32 | ||
33 | namespace detail { | |
34 | ||
35 | template <typename Char> | |
36 | void write_escaped_path(basic_memory_buffer<Char>& quoted, | |
37 | const std::filesystem::path& p) { | |
38 | write_escaped_string<Char>(std::back_inserter(quoted), p.string<Char>()); | |
39 | } | |
40 | # ifdef _WIN32 | |
41 | template <> | |
42 | inline void write_escaped_path<char>(basic_memory_buffer<char>& quoted, | |
43 | const std::filesystem::path& p) { | |
44 | auto s = p.u8string(); | |
45 | write_escaped_string<char>( | |
46 | std::back_inserter(quoted), | |
47 | string_view(reinterpret_cast<const char*>(s.c_str()), s.size())); | |
48 | } | |
49 | # endif | |
50 | template <> | |
51 | inline void write_escaped_path<std::filesystem::path::value_type>( | |
52 | basic_memory_buffer<std::filesystem::path::value_type>& quoted, | |
53 | const std::filesystem::path& p) { | |
54 | write_escaped_string<std::filesystem::path::value_type>( | |
55 | std::back_inserter(quoted), p.native()); | |
56 | } | |
57 | ||
58 | } // namespace detail | |
59 | ||
60 | template <typename Char> | |
61 | struct formatter<std::filesystem::path, Char> | |
62 | : formatter<basic_string_view<Char>> { | |
63 | template <typename FormatContext> | |
64 | auto format(const std::filesystem::path& p, FormatContext& ctx) const -> | |
65 | typename FormatContext::iterator { | |
66 | basic_memory_buffer<Char> quoted; | |
67 | detail::write_escaped_path(quoted, p); | |
68 | return formatter<basic_string_view<Char>>::format( | |
69 | basic_string_view<Char>(quoted.data(), quoted.size()), ctx); | |
70 | } | |
71 | }; | |
72 | FMT_END_NAMESPACE | |
73 | #endif | |
74 | ||
75 | FMT_BEGIN_NAMESPACE | |
76 | template <typename Char> | |
77 | struct formatter<std::thread::id, Char> : basic_ostream_formatter<Char> {}; | |
78 | FMT_END_NAMESPACE | |
79 | ||
80 | #ifdef __cpp_lib_variant | |
81 | FMT_BEGIN_NAMESPACE | |
82 | template <typename Char> struct formatter<std::monostate, Char> { | |
83 | template <typename ParseContext> | |
84 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { | |
85 | return ctx.begin(); | |
86 | } | |
87 | ||
88 | template <typename FormatContext> | |
89 | auto format(const std::monostate&, FormatContext& ctx) const | |
90 | -> decltype(ctx.out()) { | |
91 | auto out = ctx.out(); | |
92 | out = detail::write<Char>(out, "monostate"); | |
93 | return out; | |
94 | } | |
95 | }; | |
96 | ||
97 | namespace detail { | |
98 | ||
99 | template <typename T> | |
100 | using variant_index_sequence = | |
101 | std::make_index_sequence<std::variant_size<T>::value>; | |
102 | ||
103 | // variant_size and variant_alternative check. | |
104 | template <typename T, typename U = void> | |
105 | struct is_variant_like_ : std::false_type {}; | |
106 | template <typename T> | |
107 | struct is_variant_like_<T, std::void_t<decltype(std::variant_size<T>::value)>> | |
108 | : std::true_type {}; | |
109 | ||
110 | // formattable element check | |
111 | template <typename T, typename C> class is_variant_formattable_ { | |
112 | template <std::size_t... I> | |
113 | static std::conjunction< | |
114 | is_formattable<std::variant_alternative_t<I, T>, C>...> | |
115 | check(std::index_sequence<I...>); | |
116 | ||
117 | public: | |
118 | static constexpr const bool value = | |
119 | decltype(check(variant_index_sequence<T>{}))::value; | |
120 | }; | |
121 | ||
122 | template <typename Char, typename OutputIt, typename T> | |
123 | auto write_variant_alternative(OutputIt out, const T& v) -> OutputIt { | |
124 | if constexpr (is_string<T>::value) | |
125 | return write_escaped_string<Char>(out, detail::to_string_view(v)); | |
126 | else if constexpr (std::is_same_v<T, Char>) | |
127 | return write_escaped_char(out, v); | |
128 | else | |
129 | return write<Char>(out, v); | |
130 | } | |
131 | ||
132 | } // namespace detail | |
133 | ||
134 | template <typename T> struct is_variant_like { | |
135 | static constexpr const bool value = detail::is_variant_like_<T>::value; | |
136 | }; | |
137 | ||
138 | template <typename T, typename C> struct is_variant_formattable { | |
139 | static constexpr const bool value = | |
140 | detail::is_variant_formattable_<T, C>::value; | |
141 | }; | |
142 | ||
143 | template <typename Variant, typename Char> | |
144 | struct formatter< | |
145 | Variant, Char, | |
146 | std::enable_if_t<std::conjunction_v< | |
147 | is_variant_like<Variant>, is_variant_formattable<Variant, Char>>>> { | |
148 | template <typename ParseContext> | |
149 | FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { | |
150 | return ctx.begin(); | |
151 | } | |
152 | ||
153 | template <typename FormatContext> | |
154 | auto format(const Variant& value, FormatContext& ctx) const | |
155 | -> decltype(ctx.out()) { | |
156 | auto out = ctx.out(); | |
157 | ||
158 | out = detail::write<Char>(out, "variant("); | |
159 | std::visit( | |
160 | [&](const auto& v) { | |
161 | out = detail::write_variant_alternative<Char>(out, v); | |
162 | }, | |
163 | value); | |
164 | *out++ = ')'; | |
165 | return out; | |
166 | } | |
167 | }; | |
168 | FMT_END_NAMESPACE | |
169 | #endif | |
170 | ||
171 | #endif // FMT_STD_H_ |