url/grammar/digit_chars.hpp

0001 //
0002 // Copyright (c) 2021 Vinnie Falco (vinnie dot falco at gmail dot com)
0003 //
0004 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0005 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007 // Official repository: https://github.com/boostorg/url
0008 //
0009
0010 #ifndef BOOST_URL_GRAMMAR_DIGIT_CHARS_HPP
0011 #define BOOST_URL_GRAMMAR_DIGIT_CHARS_HPP
0012
0013 #include <boost/url/detail/config.hpp>
0014 #include <boost/url/grammar/detail/charset.hpp>
0015
0016 namespace boost {
0017 namespace urls {
0018 namespace grammar {
0019
0020 /** The set of decimal digits
0021
0022     @par Example
0023     Character sets are used with rules and the
0024     functions @ref find_if and @ref find_if_not.
0025     @code
0026     system::result< core::string_view > rv = parse( "2022", token_rule( digit_chars ) );
0027     @endcode
0028
0029     @par BNF
0030     @code
0031     DIGIT       = %x30-39
0032                 ; 0-9
0033     @endcode
0034
0035     @par Specification
0036     @li <a href="https://datatracker.ietf.org/doc/html/rfc5234#appendix-B.1"
0037         >B.1. Core Rules (rfc5234)</a>
0038
0039     @see
0040         @ref find_if,
0041         @ref find_if_not,
0042         @ref parse,
0043         @ref token_rule.
0044 */
0045 #ifdef BOOST_URL_DOCS
0046 constexpr __implementation_defined__ digit_chars;
0047 #else
0048 namespace implementation_defined {
0049 struct digit_chars_t
0050 {
0051     constexpr
0052     bool
0053     operator()(char c) const noexcept
0054     {
0055         return c >= '0' && c <= '9';
0056     }
0057
0058 #ifdef BOOST_URL_USE_SSE2
0059     char const*
0060     find_if(
0061         char const* first,
0062         char const* last) const noexcept
0063     {
0064         return detail::find_if_pred(
0065             *this, first, last);
0066     }
0067
0068     char const*
0069     find_if_not(
0070         char const* first,
0071         char const* last) const noexcept
0072     {
0073         return detail::find_if_not_pred(
0074             *this, first, last);
0075     }
0076 #endif
0077 };
0078 }
0079
0080 /** The set of decimal digits
0081
0082     @par Example
0083     Character sets are used with rules and the
0084     functions @ref find_if and @ref find_if_not.
0085     @code
0086     system::result< core::string_view > rv = parse( "2022", token_rule( digit_chars ) );
0087     @endcode
0088
0089     @par BNF
0090     @code
0091     DIGIT       = %x30-39
0092                 ; 0-9
0093     @endcode
0094
0095     @par Specification
0096     @li <a href="https://datatracker.ietf.org/doc/html/rfc5234#appendix-B.1"
0097         >B.1. Core Rules (rfc5234)</a>
0098
0099     @see
0100         @ref find_if,
0101         @ref find_if_not,
0102         @ref parse,
0103         @ref token_rule.
0104 */
0105 constexpr implementation_defined::digit_chars_t digit_chars{};
0106 #endif
0107
0108 } // grammar
0109 } // urls
0110 } // boost
0111
0112 #endif