93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
#include "server/api/url_parser.hpp"
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#include "engine/polyline_compressor.hpp"
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#include <boost/fusion/include/adapt_struct.hpp>
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#include <boost/phoenix.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/repository/include/qi_iter_pos.hpp>
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#include <string>
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#include <type_traits>
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BOOST_FUSION_ADAPT_STRUCT(osrm::server::api::ParsedURL,
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(std::string, service)(unsigned, version)(std::string,
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profile)(std::string, query))
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// Keep impl. TU local
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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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template <typename Iterator, typename Into> //
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struct URLParser final : qi::grammar<Iterator, Into>
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{
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URLParser() : URLParser::base_type(start)
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{
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using boost::spirit::repository::qi::iter_pos;
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identifier = qi::char_("a-zA-Z0-9_.~:-");
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percent_encoding =
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qi::char_('%') > qi::uint_parser<unsigned char, 16, 2, 2>()[qi::_val = qi::_1];
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polyline_chars = qi::char_("a-zA-Z0-9_[]{}@?|\\~`^") | percent_encoding;
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all_chars = polyline_chars | qi::char_("=,;:&().-");
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service = +identifier;
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version = qi::uint_;
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profile = +identifier;
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query = +all_chars;
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// Example input: /route/v1/driving/7.416351,43.731205;7.420363,43.736189
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start = qi::lit('/') > service > qi::lit('/') > qi::lit('v') > version > qi::lit('/') >
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profile > qi::lit('/') >
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qi::omit[iter_pos[ph::bind(&osrm::server::api::ParsedURL::prefix_length, qi::_val) =
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qi::_1 - qi::_r1]] > query;
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BOOST_SPIRIT_DEBUG_NODES((start)(service)(version)(profile)(query))
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}
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qi::rule<Iterator, Into> start;
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qi::rule<Iterator, std::string()> service;
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qi::rule<Iterator, unsigned()> version;
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qi::rule<Iterator, std::string()> profile;
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qi::rule<Iterator, std::string()> query;
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qi::rule<Iterator, char()> identifier;
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qi::rule<Iterator, char()> all_chars;
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qi::rule<Iterator, char()> polyline_chars;
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qi::rule<Iterator, char()> percent_encoding;
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};
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} // namespace
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namespace osrm::server::api
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{
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std::optional<ParsedURL> parseURL(std::string::iterator &iter, const std::string::iterator end)
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{
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using It = std::decay<decltype(iter)>::type;
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static URLParser<It, ParsedURL(It)> const parser;
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ParsedURL out;
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try
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{
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const auto ok = boost::spirit::qi::parse(iter, end, parser(boost::phoenix::val(iter)), out);
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if (ok && iter == end)
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return std::make_optional(out);
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}
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catch (const qi::expectation_failure<It> &failure)
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{
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// The grammar above using expectation parsers ">" does not automatically increment the
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// iterator to the failing position. Extract the position from the exception ourselves.
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iter = failure.first;
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}
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return std::nullopt;
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}
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} // namespace osrm::server::api
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