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
44 lines
998 B
C++
44 lines
998 B
C++
#ifndef NEAREST_PARAMETERS_GRAMMAR_HPP
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#define NEAREST_PARAMETERS_GRAMMAR_HPP
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#include "engine/api/nearest_parameters.hpp"
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#include "server/api/base_parameters_grammar.hpp"
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//#define BOOST_SPIRIT_DEBUG
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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 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 NearestParametersGrammar final : public BaseParametersGrammar
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{
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using Iterator = std::string::iterator;
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NearestParametersGrammar() : BaseParametersGrammar(root_rule, parameters)
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{
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const auto set_number = [this](const unsigned number) {
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parameters.number_of_results = number;
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};
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nearest_rule = (qi::lit("number=") > qi::uint_)[set_number];
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root_rule =
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query_rule > -qi::lit(".json") > -(qi::lit("?") > (nearest_rule | base_rule) % '&');
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}
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engine::api::NearestParameters parameters;
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private:
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qi::rule<Iterator> root_rule;
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qi::rule<Iterator> nearest_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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