54 lines
2 KiB
C++
54 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) 2024 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 {
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namespace grammar {
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namespace x3 = boost::spirit::x3;
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using x3::lexeme;
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using x3::standard_wide::char_;
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const auto create_string = [](auto& ctx) {
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_val(ctx).push_back(_attr(ctx));
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};
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const auto create_attribute = [](auto& ctx) {
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_val(ctx).push_back(mapnik::attribute(_attr(ctx)));
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};
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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(path_expression, attr_expression, str_expression);
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} // namespace grammar
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} // namespace mapnik
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#endif // MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP
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