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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2022 Alan de Freitas (alandefreitas@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_DETAIL_FORMAT_ARGS_HPP | ||
| 11 | #define BOOST_URL_DETAIL_FORMAT_ARGS_HPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/encode.hpp> | ||
| 14 | #include <boost/url/grammar/lut_chars.hpp> | ||
| 15 | |||
| 16 | #include <boost/core/ignore_unused.hpp> | ||
| 17 | #include <array> | ||
| 18 | |||
| 19 | // This file implements functions and classes to | ||
| 20 | // type-erase format arguments. | ||
| 21 | |||
| 22 | namespace boost { | ||
| 23 | namespace urls { | ||
| 24 | namespace detail { | ||
| 25 | |||
| 26 | // state of the format string. It basically keeps | ||
| 27 | // track of where we are in the format string. | ||
| 28 | class format_parse_context | ||
| 29 | { | ||
| 30 | char const* begin_; | ||
| 31 | char const* end_; | ||
| 32 | std::size_t arg_id_ = 0; | ||
| 33 | |||
| 34 | public: | ||
| 35 | constexpr | ||
| 36 | 632 | format_parse_context( | |
| 37 | char const* first, | ||
| 38 | char const* last, | ||
| 39 | std::size_t arg_id = 0) | ||
| 40 | 632 | : begin_( first ) | |
| 41 | , end_( last ) | ||
| 42 | 632 | , arg_id_( arg_id ) | |
| 43 | 632 | {} | |
| 44 | |||
| 45 | constexpr | ||
| 46 | 495 | format_parse_context( | |
| 47 | core::string_view fmt, | ||
| 48 | std::size_t arg_id = 0) | ||
| 49 | 495 | : format_parse_context( | |
| 50 | fmt.data(), | ||
| 51 | 495 | fmt.data() + fmt.size(), | |
| 52 | 495 | arg_id ) | |
| 53 | 495 | {} | |
| 54 | |||
| 55 | constexpr | ||
| 56 | char const* | ||
| 57 | 1445 | begin() const noexcept | |
| 58 | { | ||
| 59 | 1445 | return begin_; | |
| 60 | } | ||
| 61 | |||
| 62 | constexpr | ||
| 63 | char const* | ||
| 64 | 971 | end() const noexcept | |
| 65 | { | ||
| 66 | 971 | return end_; | |
| 67 | } | ||
| 68 | |||
| 69 | BOOST_CXX14_CONSTEXPR | ||
| 70 | void | ||
| 71 | 950 | advance_to( char const* it ) | |
| 72 | { | ||
| 73 | 950 | begin_ = it; | |
| 74 | 950 | } | |
| 75 | |||
| 76 | std::size_t | ||
| 77 | 871 | next_arg_id() | |
| 78 | { | ||
| 79 | 871 | return arg_id_++; | |
| 80 | } | ||
| 81 | }; | ||
| 82 | |||
| 83 | // State of the destination string | ||
| 84 | class format_context; | ||
| 85 | class measure_context; | ||
| 86 | struct ignore_format {}; | ||
| 87 | |||
| 88 | template <class T> | ||
| 89 | struct named_arg | ||
| 90 | { | ||
| 91 | core::string_view name; | ||
| 92 | T const& value; | ||
| 93 | |||
| 94 | 37 | named_arg(core::string_view n, T const& v) | |
| 95 | : name(n) | ||
| 96 | 37 | , value(v) | |
| 97 | 37 | {} | |
| 98 | }; | ||
| 99 | |||
| 100 | // A type erased format argument | ||
| 101 | class format_arg | ||
| 102 | { | ||
| 103 | void const* arg_; | ||
| 104 | void (*measure_)( | ||
| 105 | format_parse_context&, | ||
| 106 | measure_context&, | ||
| 107 | grammar::lut_chars const&, | ||
| 108 | void const* ); | ||
| 109 | void (*fmt_)( | ||
| 110 | format_parse_context&, | ||
| 111 | format_context&, | ||
| 112 | grammar::lut_chars const&, | ||
| 113 | void const* ); | ||
| 114 | core::string_view name_; | ||
| 115 | std::size_t value_ = 0; | ||
| 116 | bool ignore_ = false; | ||
| 117 | |||
| 118 | template <class A> | ||
| 119 | static | ||
| 120 | void | ||
| 121 | measure_impl( | ||
| 122 | format_parse_context& pctx, | ||
| 123 | measure_context& mctx, | ||
| 124 | grammar::lut_chars const& cs, | ||
| 125 | void const* a ); | ||
| 126 | |||
| 127 | template <class A> | ||
| 128 | static | ||
| 129 | void | ||
| 130 | format_impl( | ||
| 131 | format_parse_context& pctx, | ||
| 132 | format_context& fctx, | ||
| 133 | grammar::lut_chars const& cs, | ||
| 134 | void const* a ); | ||
| 135 | |||
| 136 | public: | ||
| 137 | template<class A> | ||
| 138 | format_arg( A&& a ); | ||
| 139 | |||
| 140 | template<class A> | ||
| 141 | format_arg( named_arg<A>&& a ); | ||
| 142 | |||
| 143 | template<class A> | ||
| 144 | format_arg( core::string_view name, A&& a ); | ||
| 145 | |||
| 146 | 34 | format_arg() | |
| 147 |
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34 | : format_arg(ignore_format{}) |
| 148 | 34 | {} | |
| 149 | |||
| 150 | explicit | ||
| 151 | operator bool() const noexcept | ||
| 152 | { | ||
| 153 | return !ignore_; | ||
| 154 | } | ||
| 155 | |||
| 156 | void | ||
| 157 | 240 | measure( | |
| 158 | format_parse_context& pctx, | ||
| 159 | measure_context& mctx, | ||
| 160 | grammar::lut_chars const& cs) | ||
| 161 | { | ||
| 162 | 240 | measure_( pctx, mctx, cs, arg_ ); | |
| 163 | 238 | } | |
| 164 | |||
| 165 | void | ||
| 166 | 236 | format( | |
| 167 | format_parse_context& pctx, | ||
| 168 | format_context& fctx, | ||
| 169 | grammar::lut_chars const& cs ) | ||
| 170 | { | ||
| 171 | 236 | fmt_( pctx, fctx, cs, arg_ ); | |
| 172 | 236 | } | |
| 173 | |||
| 174 | core::string_view | ||
| 175 | 130 | name() const | |
| 176 | { | ||
| 177 | 130 | return name_; | |
| 178 | } | ||
| 179 | |||
| 180 | std::size_t | ||
| 181 | 28 | value() const | |
| 182 | { | ||
| 183 | 28 | return value_; | |
| 184 | } | ||
| 185 | }; | ||
| 186 | |||
| 187 | // create temp stack storage for type erased args | ||
| 188 | template< class... Args > | ||
| 189 | std::array<format_arg, sizeof...(Args)> | ||
| 190 | 288 | make_format_args( Args&&... args ) | |
| 191 | { | ||
| 192 | 288 | return {{ std::forward<Args>(args)... }}; | |
| 193 | } | ||
| 194 | |||
| 195 | // reference to an array of format_args | ||
| 196 | class format_args | ||
| 197 | { | ||
| 198 | format_arg const* p_{nullptr}; | ||
| 199 | std::size_t n_{0}; | ||
| 200 | |||
| 201 | public: | ||
| 202 | 3 | format_args( | |
| 203 | detail::format_arg const* first, | ||
| 204 | detail::format_arg const* last ) noexcept | ||
| 205 | 3 | : p_(first) | |
| 206 | 3 | , n_(static_cast<std::size_t>(last - first)) | |
| 207 | 3 | {} | |
| 208 | |||
| 209 | template < std::size_t N > | ||
| 210 | 288 | format_args( std::array<format_arg, N> const& store ) noexcept | |
| 211 | : p_(store.data()) | ||
| 212 | 288 | , n_(store.size()) | |
| 213 | 288 | {} | |
| 214 | |||
| 215 | format_arg | ||
| 216 | 442 | get( std::size_t i ) const noexcept | |
| 217 | { | ||
| 218 |
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442 | if (i < n_) |
| 219 | 438 | return p_[i]; | |
| 220 | 4 | return {}; | |
| 221 | } | ||
| 222 | |||
| 223 | format_arg | ||
| 224 | 62 | get( core::string_view name ) const noexcept | |
| 225 | { | ||
| 226 |
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132 | for (std::size_t i = 0; i < n_; ++i) |
| 227 | { | ||
| 228 |
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130 | if (p_[i].name() == name) |
| 229 | 60 | return p_[i]; | |
| 230 | } | ||
| 231 | 2 | return {}; | |
| 232 | } | ||
| 233 | }; | ||
| 234 | |||
| 235 | // define the format_context after format_args | ||
| 236 | class format_context | ||
| 237 | { | ||
| 238 | format_args args_; | ||
| 239 | char* out_; | ||
| 240 | |||
| 241 | public: | ||
| 242 | 137 | format_context( | |
| 243 | char* out, | ||
| 244 | format_args args ) | ||
| 245 | 137 | : args_( args ) | |
| 246 | 137 | , out_( out ) | |
| 247 | 137 | {} | |
| 248 | |||
| 249 | format_args | ||
| 250 | 14 | args() const noexcept | |
| 251 | { | ||
| 252 | 14 | return args_; | |
| 253 | } | ||
| 254 | |||
| 255 | format_arg | ||
| 256 | 210 | arg( std::size_t id ) const noexcept | |
| 257 | { | ||
| 258 | 210 | return args_.get( id ); | |
| 259 | } | ||
| 260 | |||
| 261 | format_arg | ||
| 262 | 26 | arg( core::string_view name ) const noexcept | |
| 263 | { | ||
| 264 | 26 | return args_.get( name ); | |
| 265 | } | ||
| 266 | |||
| 267 | char* | ||
| 268 | 939 | out() | |
| 269 | { | ||
| 270 | 939 | return out_; | |
| 271 | } | ||
| 272 | |||
| 273 | void | ||
| 274 | 939 | advance_to( char* it ) | |
| 275 | { | ||
| 276 | 939 | out_ = it; | |
| 277 | 939 | } | |
| 278 | }; | ||
| 279 | |||
| 280 | // define the measure_context after format_args | ||
| 281 | class measure_context | ||
| 282 | { | ||
| 283 | format_args args_; | ||
| 284 | std::size_t out_; | ||
| 285 | |||
| 286 | public: | ||
| 287 | 140 | measure_context( | |
| 288 | format_args args ) | ||
| 289 | 140 | : measure_context(0, args) | |
| 290 | 140 | {} | |
| 291 | |||
| 292 | 140 | measure_context( | |
| 293 | std::size_t out, | ||
| 294 | format_args args ) | ||
| 295 | 140 | : args_( args ) | |
| 296 | 140 | , out_( out ) | |
| 297 | 140 | {} | |
| 298 | |||
| 299 | format_args | ||
| 300 | 14 | args() const noexcept | |
| 301 | { | ||
| 302 | 14 | return args_; | |
| 303 | } | ||
| 304 | |||
| 305 | format_arg | ||
| 306 | 214 | arg( std::size_t id ) const noexcept | |
| 307 | { | ||
| 308 | 214 | return args_.get( id ); | |
| 309 | } | ||
| 310 | |||
| 311 | format_arg | ||
| 312 | 26 | arg( core::string_view name ) const noexcept | |
| 313 | { | ||
| 314 | 26 | return args_.get( name ); | |
| 315 | } | ||
| 316 | |||
| 317 | std::size_t | ||
| 318 | 953 | out() | |
| 319 | { | ||
| 320 | 953 | return out_; | |
| 321 | } | ||
| 322 | |||
| 323 | void | ||
| 324 | 953 | advance_to( std::size_t n ) | |
| 325 | { | ||
| 326 | 953 | out_ = n; | |
| 327 | 953 | } | |
| 328 | }; | ||
| 329 | |||
| 330 | // fwd declare the formatter | ||
| 331 | template <class T, class = void> | ||
| 332 | struct formatter; | ||
| 333 | |||
| 334 | } // detail | ||
| 335 | } // url | ||
| 336 | } // boost | ||
| 337 | |||
| 338 | #include <boost/url/detail/impl/format_args.hpp> | ||
| 339 | |||
| 340 | #endif | ||
| 341 |