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
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
#ifndef TABLE_PARAMETERS_GRAMMAR_HPP
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#define TABLE_PARAMETERS_GRAMMAR_HPP
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#include "engine/api/table_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 TableParametersGrammar final : public BaseParametersGrammar
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{
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using Iterator = std::string::iterator;
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using SourcesT = std::vector<std::size_t>;
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using DestinationsT = std::vector<std::size_t>;
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TableParametersGrammar() : BaseParametersGrammar(root_rule, parameters)
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{
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const auto set_destiantions = [this](DestinationsT dests) {
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parameters.destinations = std::move(dests);
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};
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const auto set_sources = [this](SourcesT sources) {
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parameters.sources = std::move(sources);
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};
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destinations_rule = (qi::lit("destinations=") > (qi::ulong_ % ";")[set_destiantions]) |
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qi::lit("destinations=all");
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sources_rule =
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(qi::lit("sources=") > (qi::ulong_ % ";")[set_sources]) | qi::lit("sources=all");
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table_rule = destinations_rule | sources_rule;
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root_rule =
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query_rule > -qi::lit(".json") > -(qi::lit("?") > (table_rule | base_rule) % '&');
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}
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engine::api::TableParameters parameters;
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private:
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qi::rule<Iterator> root_rule;
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qi::rule<Iterator> table_rule;
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qi::rule<Iterator> sources_rule;
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qi::rule<Iterator> destinations_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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