c191e196c0
Spirit rules are just placeholders. They are cheap to construct and by doing this static initialization order fiasco problem is effectively avoided. Also had to fix name clash between geojson and generic json parsers.
52 lines
2 KiB
C++
52 lines
2 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2017 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP
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#define MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP
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// mapnik
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#include <mapnik/path_expression_grammar_x3.hpp>
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#include <mapnik/attribute.hpp>
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namespace mapnik { namespace grammar {
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namespace x3 = boost::spirit::x3;
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using x3::standard_wide::char_;
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using x3::lexeme;
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auto create_string = [](auto & ctx) { _val(ctx).push_back(_attr(ctx)); };
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auto create_attribute = [](auto & ctx) { _val(ctx).push_back(mapnik::attribute(_attr(ctx))); };
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// rules
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x3::rule<class attr_expression, std::string> const attr_expression("attribute");
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x3::rule<class str_expression, std::string> const str_expression("string");
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auto const attr_expression_def = +(char_ - ']');
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auto const str_expression_def = lexeme[+(char_ -'[')];
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auto const path_expression_def = *(str_expression[create_string] | ('[' > attr_expression[create_attribute] > ']'));
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BOOST_SPIRIT_DEFINE(
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path_expression,
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attr_expression,
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str_expression
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);
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}}
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#endif //MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP
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