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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot 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_GRAMMAR_DELIM_RULE_HPP | ||
| 11 | #define BOOST_URL_GRAMMAR_DELIM_RULE_HPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/config.hpp> | ||
| 14 | #include <boost/core/detail/string_view.hpp> | ||
| 15 | #include <boost/url/grammar/charset.hpp> | ||
| 16 | #include <boost/url/grammar/error.hpp> | ||
| 17 | #include <boost/url/grammar/type_traits.hpp> | ||
| 18 | #include <type_traits> | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace urls { | ||
| 22 | namespace grammar { | ||
| 23 | |||
| 24 | /** Match a character literal | ||
| 25 | |||
| 26 | This matches the specified character. | ||
| 27 | The value is a reference to the character | ||
| 28 | in the underlying buffer, expressed as a | ||
| 29 | `core::string_view`. The function @ref squelch | ||
| 30 | may be used to turn this into `void` instead. | ||
| 31 | If there is no more input, the error code | ||
| 32 | @ref error::need_more is returned. | ||
| 33 | |||
| 34 | @par Value Type | ||
| 35 | @code | ||
| 36 | using value_type = core::string_view; | ||
| 37 | @endcode | ||
| 38 | |||
| 39 | @par Example | ||
| 40 | Rules are used with the function @ref parse. | ||
| 41 | @code | ||
| 42 | system::result< core::string_view > rv = parse( ".", delim_rule('.') ); | ||
| 43 | @endcode | ||
| 44 | |||
| 45 | @par BNF | ||
| 46 | @code | ||
| 47 | char = %00-FF | ||
| 48 | @endcode | ||
| 49 | |||
| 50 | @param ch The character to match | ||
| 51 | |||
| 52 | @see | ||
| 53 | @ref parse, | ||
| 54 | @ref squelch. | ||
| 55 | */ | ||
| 56 | #ifdef BOOST_URL_DOCS | ||
| 57 | constexpr | ||
| 58 | __implementation_defined__ | ||
| 59 | delim_rule( char ch ) noexcept; | ||
| 60 | #else | ||
| 61 | struct ch_delim_rule | ||
| 62 | { | ||
| 63 | using value_type = core::string_view; | ||
| 64 | |||
| 65 | constexpr | ||
| 66 | 11591 | ch_delim_rule(char ch) noexcept | |
| 67 | 11591 | : ch_(ch) | |
| 68 | { | ||
| 69 | 11591 | } | |
| 70 | |||
| 71 | BOOST_URL_DECL | ||
| 72 | system::result<value_type> | ||
| 73 | parse( | ||
| 74 | char const*& it, | ||
| 75 | char const* end) const noexcept; | ||
| 76 | |||
| 77 | private: | ||
| 78 | char ch_; | ||
| 79 | }; | ||
| 80 | |||
| 81 | constexpr | ||
| 82 | ch_delim_rule | ||
| 83 | 11591 | delim_rule( char ch ) noexcept | |
| 84 | { | ||
| 85 | 11591 | return ch_delim_rule(ch); | |
| 86 | } | ||
| 87 | #endif | ||
| 88 | |||
| 89 | //------------------------------------------------ | ||
| 90 | |||
| 91 | /** Match a single character from a character set | ||
| 92 | |||
| 93 | This matches exactly one character which | ||
| 94 | belongs to the specified character set. | ||
| 95 | The value is a reference to the character | ||
| 96 | in the underlying buffer, expressed as a | ||
| 97 | `core::string_view`. The function @ref squelch | ||
| 98 | may be used to turn this into `void` instead. | ||
| 99 | If there is no more input, the error code | ||
| 100 | @ref error::need_more is returned. | ||
| 101 | |||
| 102 | @par Value Type | ||
| 103 | @code | ||
| 104 | using value_type = core::string_view; | ||
| 105 | @endcode | ||
| 106 | |||
| 107 | @par Example | ||
| 108 | Rules are used with the function @ref parse. | ||
| 109 | @code | ||
| 110 | system::result< core::string_view > rv = parse( "X", delim_rule( alpha_chars ) ); | ||
| 111 | @endcode | ||
| 112 | |||
| 113 | @param cs The character set to use. | ||
| 114 | |||
| 115 | @see | ||
| 116 | @ref alpha_chars, | ||
| 117 | @ref parse, | ||
| 118 | @ref squelch. | ||
| 119 | */ | ||
| 120 | #ifdef BOOST_URL_DOCS | ||
| 121 | template<class CharSet> | ||
| 122 | constexpr | ||
| 123 | __implementation_defined__ | ||
| 124 | delim_rule( CharSet const& cs ) noexcept; | ||
| 125 | #else | ||
| 126 | template<class CharSet> | ||
| 127 | struct cs_delim_rule | ||
| 128 | { | ||
| 129 | using value_type = core::string_view; | ||
| 130 | |||
| 131 | constexpr | ||
| 132 | 3 | cs_delim_rule( | |
| 133 | CharSet const& cs) noexcept | ||
| 134 | : cs_(cs) | ||
| 135 | { | ||
| 136 | 3 | } | |
| 137 | |||
| 138 | system::result<value_type> | ||
| 139 | 877 | parse( | |
| 140 | char const*& it, | ||
| 141 | char const* end) const noexcept | ||
| 142 | { | ||
| 143 |
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877 | if(it == end) |
| 144 | { | ||
| 145 | // end | ||
| 146 | 1 | BOOST_URL_RETURN_EC( | |
| 147 | error::need_more); | ||
| 148 | } | ||
| 149 |
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876 | if(! cs_(*it)) |
| 150 | { | ||
| 151 | // wrong character | ||
| 152 | 350 | BOOST_URL_RETURN_EC( | |
| 153 | error::mismatch); | ||
| 154 | } | ||
| 155 | 1052 | return core::string_view{ | |
| 156 | 526 | it++, 1 }; | |
| 157 | } | ||
| 158 | |||
| 159 | private: | ||
| 160 | CharSet cs_; | ||
| 161 | }; | ||
| 162 | |||
| 163 | template<class CharSet> | ||
| 164 | constexpr | ||
| 165 | typename std::enable_if< | ||
| 166 | ! std::is_convertible< | ||
| 167 | CharSet, char>::value, | ||
| 168 | cs_delim_rule<CharSet>>::type | ||
| 169 | 3 | delim_rule( | |
| 170 | CharSet const& cs) noexcept | ||
| 171 | { | ||
| 172 | // If you get a compile error here it | ||
| 173 | // means that your type does not meet | ||
| 174 | // the requirements for a CharSet. | ||
| 175 | // Please consult the documentation. | ||
| 176 | static_assert( | ||
| 177 | is_charset<CharSet>::value, | ||
| 178 | "CharSet requirements not met"); | ||
| 179 | |||
| 180 | 3 | return cs_delim_rule<CharSet>(cs); | |
| 181 | } | ||
| 182 | #endif | ||
| 183 | |||
| 184 | } // grammar | ||
| 185 | } // urls | ||
| 186 | } // boost | ||
| 187 | |||
| 188 | #endif | ||
| 189 |