51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
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/*=============================================================================
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Copyright (c) 2019 Tom Tan
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/home/x3.hpp>
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#include <boost/fusion/adapted/std_tuple.hpp>
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#include <iostream>
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#include <tuple>
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#include <string>
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//
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// X3 does not support more than one attribute anymore in the parse function,
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// this example show how to wrap multiple attributes into one leveraging std::tuple.
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//
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std::tuple<uint32_t, uint32_t, uint32_t> parse_message_prefix_revision(const std::string &s)
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{
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namespace x3 = boost::spirit::x3;
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auto const uint_3_digits = x3::uint_parser<std::uint32_t, 10, 3, 3>{};
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auto const uint_4_digits = x3::uint_parser<std::uint32_t, 10, 4, 4>{};
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auto iter = s.cbegin();
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auto end_iter = s.cend();
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std::tuple<uint32_t, uint32_t, uint32_t> length_id_revision;
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x3::parse(iter, end_iter,
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uint_4_digits >> uint_4_digits >> uint_3_digits,
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length_id_revision);
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return length_id_revision;
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}
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int main()
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{
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std::string s = "00200060001";
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std::cout << "parsing " << s << '\n';
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auto [len, id, rev] = parse_message_prefix_revision(s);
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std::cout << "length = " << len << '\n'
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<< "id = " << id << '\n'
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<< "revision =" << rev;
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} |