119 lines
3.9 KiB
C++
119 lines
3.9 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) 2021 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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#include <mapnik/image_options.hpp>
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.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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MAPNIK_DISABLE_WARNING_POP
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#if defined(HAVE_PNG)
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extern "C" {
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#include <png.h>
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}
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#endif // HAVE_PNG
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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::lit;
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using x3::ascii::char_;
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using pair_type = std::pair<std::string, boost::optional<std::string>>;
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x3::rule<class image_options, image_options_map> const image_options("image options");
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x3::rule<class key_value, pair_type> const key_value("key_value");
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x3::rule<class key, std::string> const key("key");
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x3::rule<class value, std::string> const value("value");
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auto const key_def = char_("a-zA-Z_") > *char_("a-zA-Z_0-9\\.\\-");
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auto const value_def = +char_("a-zA-Z_0-9\\.\\-|");
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auto const key_value_def = key > -('=' > value);
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auto const image_options_def = key_value % lit(':');
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BOOST_SPIRIT_DEFINE(key);
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BOOST_SPIRIT_DEFINE(value);
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BOOST_SPIRIT_DEFINE(key_value);
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BOOST_SPIRIT_DEFINE(image_options);
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} // namespace grammar
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image_options_map parse_image_options(std::string const& str)
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{
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auto begin = str.begin();
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auto const end = str.end();
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using boost::spirit::x3::space;
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using mapnik::grammar::image_options;
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image_options_map options;
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try
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{
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bool success = boost::spirit::x3::phrase_parse(begin, end, image_options, space, options);
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if (!success || begin != end)
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{
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throw std::runtime_error("Can't parse image options: " + str);
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}
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}
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catch (boost::spirit::x3::expectation_failure<std::string> const& ex)
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{
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throw std::runtime_error("Can't parse image options: " + str + " " + ex.what());
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}
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return options; // RVO
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}
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#if defined(HAVE_PNG)
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int parse_png_filters(std::string const& str)
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{
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auto begin = str.begin();
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auto const end = str.end();
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using boost::spirit::x3::space;
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using boost::spirit::x3::symbols;
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symbols<int> filter;
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filter.add("none", PNG_FILTER_NONE)("sub", PNG_FILTER_SUB)("up", PNG_FILTER_UP)("avg",
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PNG_FILTER_AVG)("paeth",
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PNG_FILTER_PAETH);
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std::vector<int> opts;
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try
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{
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bool success = boost::spirit::x3::phrase_parse(begin, end, filter % "|", space, opts);
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if (!success || begin != end)
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{
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throw std::runtime_error("Can't parse PNG filters: " + str);
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}
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}
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catch (boost::spirit::x3::expectation_failure<std::string> const& ex)
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{
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throw std::runtime_error("Can't parse PNG filters: " + str + " " + ex.what());
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}
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int filters = 0;
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std::for_each(opts.begin(), opts.end(), [&filters](int f) { filters |= f; });
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return filters;
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}
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#endif // HAVE_PNG
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} // namespace mapnik
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