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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@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_ANY_SEGMENTS_ITER_HPP | ||
| 11 | #define BOOST_URL_DETAIL_ANY_SEGMENTS_ITER_HPP | ||
| 12 | |||
| 13 | #include <boost/url/pct_string_view.hpp> | ||
| 14 | #include <boost/static_assert.hpp> | ||
| 15 | #include <cstddef> | ||
| 16 | #include <iterator> | ||
| 17 | #include <type_traits> | ||
| 18 | |||
| 19 | namespace boost { | ||
| 20 | namespace urls { | ||
| 21 | namespace detail { | ||
| 22 | |||
| 23 | struct BOOST_SYMBOL_VISIBLE | ||
| 24 | any_segments_iter | ||
| 25 | { | ||
| 26 | protected: | ||
| 27 | explicit | ||
| 28 | 610 | any_segments_iter( | |
| 29 | core::string_view s_ = {}) noexcept | ||
| 30 | 610 | : s(s_) | |
| 31 | { | ||
| 32 | 610 | } | |
| 33 | |||
| 34 | 1220 | virtual ~any_segments_iter() = default; | |
| 35 | |||
| 36 | public: | ||
| 37 | // this is adjusted | ||
| 38 | // when self-intersecting | ||
| 39 | core::string_view s; | ||
| 40 | |||
| 41 | // the first segment, | ||
| 42 | // to handle special cases | ||
| 43 | core::string_view front; | ||
| 44 | |||
| 45 | // quick number of segments | ||
| 46 | // 0 = zero | ||
| 47 | // 1 = one | ||
| 48 | // 2 = two, or more | ||
| 49 | int fast_nseg = 0; | ||
| 50 | |||
| 51 | // whether the segments should encode colons | ||
| 52 | // when we measure and copy. the calling | ||
| 53 | // function uses this for the first | ||
| 54 | // segment in some cases, such as: | ||
| 55 | // "x:y:z" -> remove_scheme -> "y%3Az" | ||
| 56 | // as "y:z" would no longer represent a path | ||
| 57 | bool encode_colons = false; | ||
| 58 | |||
| 59 | // Rewind the iterator to the beginning | ||
| 60 | virtual void rewind() noexcept = 0; | ||
| 61 | |||
| 62 | // Measure and increment the current | ||
| 63 | // element. n is increased by the | ||
| 64 | // encoded size. Returns false on | ||
| 65 | // end of range. | ||
| 66 | virtual bool measure(std::size_t& n) = 0; | ||
| 67 | |||
| 68 | // Copy and increment the current | ||
| 69 | // element, encoding as needed. | ||
| 70 | virtual void copy(char*& dest, | ||
| 71 | char const* end) noexcept = 0; | ||
| 72 | }; | ||
| 73 | |||
| 74 | //------------------------------------------------ | ||
| 75 | // | ||
| 76 | // segment_iter | ||
| 77 | // | ||
| 78 | //------------------------------------------------ | ||
| 79 | |||
| 80 | // A 1-segment range | ||
| 81 | // allowing self-intersection | ||
| 82 | struct BOOST_SYMBOL_VISIBLE | ||
| 83 | segment_iter | ||
| 84 | : any_segments_iter | ||
| 85 | { | ||
| 86 | 148 | virtual ~segment_iter() = default; | |
| 87 | |||
| 88 | explicit | ||
| 89 | segment_iter( | ||
| 90 | core::string_view s) noexcept; | ||
| 91 | |||
| 92 | private: | ||
| 93 | bool at_end_ = false; | ||
| 94 | void rewind() noexcept override; | ||
| 95 | bool measure(std::size_t&) noexcept override; | ||
| 96 | void copy(char*&, char const*) noexcept override; | ||
| 97 | }; | ||
| 98 | |||
| 99 | //------------------------------------------------ | ||
| 100 | // | ||
| 101 | // segments_iter | ||
| 102 | // | ||
| 103 | //------------------------------------------------ | ||
| 104 | |||
| 105 | struct segments_iter_base | ||
| 106 | { | ||
| 107 | protected: | ||
| 108 | BOOST_URL_DECL static void | ||
| 109 | measure_impl(std::size_t&, | ||
| 110 | core::string_view, bool) noexcept; | ||
| 111 | BOOST_URL_DECL static void | ||
| 112 | copy_impl(char*&, char const*, | ||
| 113 | core::string_view, bool) noexcept; | ||
| 114 | }; | ||
| 115 | |||
| 116 | // iterates segments in a | ||
| 117 | // plain segment range | ||
| 118 | template<class FwdIt> | ||
| 119 | struct segments_iter | ||
| 120 | : any_segments_iter | ||
| 121 | , segments_iter_base | ||
| 122 | { | ||
| 123 | BOOST_STATIC_ASSERT( | ||
| 124 | std::is_convertible< | ||
| 125 | typename std::iterator_traits< | ||
| 126 | FwdIt>::reference, | ||
| 127 | core::string_view>::value); | ||
| 128 | |||
| 129 | 129 | segments_iter( | |
| 130 | FwdIt first, | ||
| 131 | FwdIt last) noexcept | ||
| 132 | 129 | : it_(first) | |
| 133 | 129 | , it0_(first) | |
| 134 | 129 | , end_(last) | |
| 135 | { | ||
| 136 |
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129 | if(first != last) |
| 137 | { | ||
| 138 | 129 | front = *first; | |
| 139 | 129 | auto it = first; | |
| 140 |
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129 | if(++it == last) |
| 141 | 16 | fast_nseg = 1; | |
| 142 | else | ||
| 143 | 113 | fast_nseg = 2; | |
| 144 | } | ||
| 145 | else | ||
| 146 | { | ||
| 147 | ✗ | fast_nseg = 0; | |
| 148 | } | ||
| 149 | 129 | } | |
| 150 | |||
| 151 | private: | ||
| 152 | FwdIt it_; | ||
| 153 | FwdIt it0_; | ||
| 154 | FwdIt end_; | ||
| 155 | |||
| 156 | void | ||
| 157 | 129 | rewind() noexcept override | |
| 158 | { | ||
| 159 | 129 | it_ = it0_; | |
| 160 | 129 | } | |
| 161 | |||
| 162 | bool | ||
| 163 | 433 | measure( | |
| 164 | std::size_t& n) noexcept override | ||
| 165 | { | ||
| 166 |
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433 | if(it_ == end_) |
| 167 | 129 | return false; | |
| 168 | 304 | measure_impl(n, | |
| 169 | 292 | detail::to_sv(*it_), | |
| 170 | 304 | encode_colons); | |
| 171 | 304 | ++it_; | |
| 172 | 304 | return true; | |
| 173 | } | ||
| 174 | |||
| 175 | void | ||
| 176 | 304 | copy( | |
| 177 | char*& dest, | ||
| 178 | char const* end) noexcept override | ||
| 179 | { | ||
| 180 | 304 | copy_impl(dest, end, | |
| 181 | 316 | detail::to_sv(*it_++), | |
| 182 | 304 | encode_colons); | |
| 183 | 304 | } | |
| 184 | }; | ||
| 185 | |||
| 186 | //------------------------------------------------ | ||
| 187 | // | ||
| 188 | // segment_encoded_iter | ||
| 189 | // | ||
| 190 | //------------------------------------------------ | ||
| 191 | |||
| 192 | // A 1-segment range | ||
| 193 | // allowing self-intersection | ||
| 194 | struct BOOST_SYMBOL_VISIBLE | ||
| 195 | segment_encoded_iter | ||
| 196 | : any_segments_iter | ||
| 197 | { | ||
| 198 | 144 | virtual ~segment_encoded_iter() = default; | |
| 199 | |||
| 200 | explicit | ||
| 201 | segment_encoded_iter( | ||
| 202 | pct_string_view const& s) noexcept; | ||
| 203 | |||
| 204 | private: | ||
| 205 | bool at_end_ = false; | ||
| 206 | void rewind() noexcept override; | ||
| 207 | bool measure(std::size_t&) noexcept override; | ||
| 208 | void copy(char*&, char const*) noexcept override; | ||
| 209 | }; | ||
| 210 | |||
| 211 | //------------------------------------------------ | ||
| 212 | // | ||
| 213 | // segments_encoded_iter | ||
| 214 | // | ||
| 215 | //------------------------------------------------ | ||
| 216 | |||
| 217 | // Validating and copying from | ||
| 218 | // a string of encoded segments | ||
| 219 | struct segments_encoded_iter_base | ||
| 220 | { | ||
| 221 | protected: | ||
| 222 | BOOST_URL_DECL static void | ||
| 223 | measure_impl(std::size_t&, | ||
| 224 | core::string_view, bool) noexcept; | ||
| 225 | BOOST_URL_DECL static void | ||
| 226 | copy_impl(char*&, char const*, | ||
| 227 | core::string_view, bool) noexcept; | ||
| 228 | }; | ||
| 229 | |||
| 230 | // iterates segments in an | ||
| 231 | // encoded segment range | ||
| 232 | template<class FwdIt> | ||
| 233 | struct segments_encoded_iter | ||
| 234 | : public any_segments_iter | ||
| 235 | , public segments_encoded_iter_base | ||
| 236 | { | ||
| 237 | BOOST_STATIC_ASSERT( | ||
| 238 | std::is_convertible< | ||
| 239 | typename std::iterator_traits< | ||
| 240 | FwdIt>::reference, | ||
| 241 | core::string_view>::value); | ||
| 242 | |||
| 243 | 415 | segments_encoded_iter( | |
| 244 | FwdIt first, | ||
| 245 | FwdIt last) | ||
| 246 | 415 | : it_(first) | |
| 247 | 415 | , it0_(first) | |
| 248 | 415 | , end_(last) | |
| 249 | { | ||
| 250 |
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415 | if(it_ != end_) |
| 251 | { | ||
| 252 | // throw on invalid input | ||
| 253 |
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226 | front = pct_string_view( |
| 254 | 125 | detail::to_sv(*first)); | |
| 255 | 213 | auto it = first; | |
| 256 |
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213 | if(++it == last) |
| 257 | 65 | fast_nseg = 1; | |
| 258 | else | ||
| 259 | 148 | fast_nseg = 2; | |
| 260 | } | ||
| 261 | else | ||
| 262 | { | ||
| 263 | 189 | fast_nseg = 0; | |
| 264 | } | ||
| 265 | 415 | } | |
| 266 | |||
| 267 | private: | ||
| 268 | FwdIt it_; | ||
| 269 | FwdIt it0_; | ||
| 270 | FwdIt end_; | ||
| 271 | |||
| 272 | void | ||
| 273 | 400 | rewind() noexcept override | |
| 274 | { | ||
| 275 | 400 | it_ = it0_; | |
| 276 | 400 | } | |
| 277 | |||
| 278 | bool | ||
| 279 | 876 | measure( | |
| 280 | std::size_t& n) override | ||
| 281 | { | ||
| 282 |
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876 | if(it_ == end_) |
| 283 | 400 | return false; | |
| 284 | // throw on invalid input | ||
| 285 | 474 | measure_impl(n, | |
| 286 |
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476 | pct_string_view( |
| 287 | 476 | detail::to_sv(*it_++)), | |
| 288 | 476 | encode_colons); | |
| 289 | 474 | return true; | |
| 290 | } | ||
| 291 | |||
| 292 | void | ||
| 293 | 472 | copy( | |
| 294 | char*& dest, | ||
| 295 | char const* end) noexcept override | ||
| 296 | { | ||
| 297 | 472 | copy_impl(dest, end, | |
| 298 | 472 | detail::to_sv(*it_++), | |
| 299 | 472 | encode_colons); | |
| 300 | 472 | } | |
| 301 | }; | ||
| 302 | |||
| 303 | //------------------------------------------------ | ||
| 304 | |||
| 305 | template<class FwdIt> | ||
| 306 | segments_iter<FwdIt> | ||
| 307 | 129 | make_segments_iter( | |
| 308 | FwdIt first, FwdIt last) | ||
| 309 | { | ||
| 310 | return segments_iter< | ||
| 311 | 129 | FwdIt>(first, last); | |
| 312 | } | ||
| 313 | |||
| 314 | template<class FwdIt> | ||
| 315 | segments_encoded_iter<FwdIt> | ||
| 316 | 385 | make_segments_encoded_iter( | |
| 317 | FwdIt first, FwdIt last) | ||
| 318 | { | ||
| 319 | return segments_encoded_iter< | ||
| 320 | 385 | FwdIt>(first, last); | |
| 321 | } | ||
| 322 | |||
| 323 | } // detail | ||
| 324 | } // urls | ||
| 325 | } // boost | ||
| 326 | |||
| 327 | #endif | ||
| 328 |