8a2bd09fd0
Sequence parsers using `>>` allow for backtracking, expectation parsers `>` do not. This allows us to properly report the position where parsing failed, by catching the expectation_failure exception and adapting the iterator ourselves. References: - https://github.com/Project-OSRM/osrm-backend/pull/2188 - https://github.com/Project-OSRM/osrm-backend/issues/2168 - http://www.boost.org/doc/libs/1_55_0/libs/spirit/doc/html/spirit/qi/reference/operator/expect.html
49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
#ifndef SERVER_API_TILE_PARAMETERS_GRAMMAR_HPP
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#define SERVER_API_TILE_PARAMETERS_GRAMMAR_HPP
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#include "engine/api/tile_parameters.hpp"
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#include "engine/hint.hpp"
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#include "engine/polyline_compressor.hpp"
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//#define BOOST_SPIRIT_DEBUG
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#include <boost/spirit/include/qi.hpp>
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#include <string>
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namespace osrm
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{
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namespace server
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{
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namespace api
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{
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namespace qi = boost::spirit::qi;
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struct TileParametersGrammar final : boost::spirit::qi::grammar<std::string::iterator>
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{
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using Iterator = std::string::iterator;
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TileParametersGrammar() : TileParametersGrammar::base_type(root_rule)
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{
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const auto set_x = [this](const unsigned x_) { parameters.x = x_; };
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const auto set_y = [this](const unsigned y_) { parameters.y = y_; };
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const auto set_z = [this](const unsigned z_) { parameters.z = z_; };
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query_rule = qi::lit("tile(") > qi::uint_[set_x] //
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> qi::lit(",") > qi::uint_[set_y] > //
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qi::lit(",") > qi::uint_[set_z] > qi::lit(")"); //
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root_rule = query_rule > qi::lit(".mvt");
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}
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engine::api::TileParameters parameters;
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private:
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qi::rule<Iterator> root_rule;
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qi::rule<Iterator> query_rule;
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};
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}
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}
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}
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#endif
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