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59 lines
1.9 KiB
C++
59 lines
1.9 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) 2025 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_SORT_BY_HPP
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#define MAPNIK_SORT_BY_HPP
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#include <boost/spirit/home/x3.hpp>
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#include <boost/fusion/include/std_pair.hpp>
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namespace mapnik {
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using sort_by_type = std::pair<std::string, bool>;
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inline bool parse_sort_by(std::string const& str, sort_by_type & result)
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{
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namespace x3 = boost::spirit::x3;
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auto itr = str.begin();
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auto end = str.end();
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auto apply_sort_by = [&](auto const& ctx) {
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result.first = _attr(ctx);
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};
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auto apply_desc = [&](auto const& ctx) {
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result.second = true;
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};
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if (!x3::phrase_parse(itr, end,
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x3::no_skip[(+x3::char_("a-zA-Z_0-9-"))][apply_sort_by]
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> -(x3::no_case[x3::lit("DESC")][apply_desc] | x3::no_case[x3::lit("ASC")]),
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// ASC is a default
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x3::space
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) || (itr != end))
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{
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return false;
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}
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return true;
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}
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} // namespace mapnik
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#endif // MAPNIK_SORT_BY_HPP
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