110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
#ifndef OSRM_CONDITIONAL_RESTRICTIONS_HPP
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#define OSRM_CONDITIONAL_RESTRICTIONS_HPP
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#include <boost/fusion/include/adapt_struct.hpp>
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#include <boost/spirit/include/phoenix.hpp>
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#include <boost/spirit/include/qi.hpp>
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namespace osrm
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{
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namespace util
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{
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// Helper functions for OSM conditional restrictions
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// http://wiki.openstreetmap.org/wiki/Conditional_restrictions
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// Consitional restrictions is a vector of ConditionalRestriction
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// with a restriction value and a condition string
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struct ConditionalRestriction
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{
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std::string value;
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std::string condition;
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};
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#ifndef NDEBUG
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// Debug output stream operators for use with BOOST_SPIRIT_DEBUG
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inline std::ostream &operator<<(std::ostream &stream, const ConditionalRestriction &restriction)
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{
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return stream << restriction.value << "=" << restriction.condition;
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}
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#endif
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}
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}
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BOOST_FUSION_ADAPT_STRUCT(osrm::util::ConditionalRestriction,
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(std::string, value)(std::string, condition))
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namespace osrm
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{
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namespace util
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{
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namespace detail
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{
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namespace
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{
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namespace ph = boost::phoenix;
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namespace qi = boost::spirit::qi;
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}
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template <typename Iterator, typename Skipper = qi::blank_type>
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struct conditional_restrictions_grammar
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: qi::grammar<Iterator, Skipper, std::vector<ConditionalRestriction>()>
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{
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// http://wiki.openstreetmap.org/wiki/Conditional_restrictions
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conditional_restrictions_grammar() : conditional_restrictions_grammar::base_type(restrictions)
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{
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using qi::_1;
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using qi::_val;
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using qi::lit;
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// clang-format off
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restrictions
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= restriction % ';'
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;
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restriction
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= value >> '@' >> condition
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;
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value
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= +(qi::char_ - '@')
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;
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condition
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= *qi::blank
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>> (lit('(') >> qi::as_string[qi::no_skip[*~lit(')')]][_val = _1] >> lit(')')
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| qi::as_string[qi::no_skip[*~lit(';')]][_val = _1]
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)
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;
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// clang-format on
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BOOST_SPIRIT_DEBUG_NODES((restrictions)(restriction)(value)(condition));
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}
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qi::rule<Iterator, Skipper, std::vector<ConditionalRestriction>()> restrictions;
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qi::rule<Iterator, Skipper, ConditionalRestriction()> restriction;
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qi::rule<Iterator, Skipper, std::string()> value, condition;
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};
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}
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inline std::vector<ConditionalRestriction> ParseConditionalRestrictions(const std::string &str)
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{
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auto it(str.begin()), end(str.end());
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const detail::conditional_restrictions_grammar<decltype(it)> static grammar;
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std::vector<ConditionalRestriction> result;
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bool ok = boost::spirit::qi::phrase_parse(it, end, grammar, boost::spirit::qi::blank, result);
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if (!ok || it != end)
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return std::vector<ConditionalRestriction>();
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return result;
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}
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} // util
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} // osrm
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#endif // OSRM_CONDITIONAL_RESTRICTIONS_HPP
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