mirror of
https://github.com/mapnik/mapnik.git
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139 lines
3.7 KiB
C++
139 lines
3.7 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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#include <mapnik/parse_path.hpp>
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#include <mapnik/config.hpp>
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#include <mapnik/attribute.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/value.hpp>
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#include <mapnik/path_expression_grammar_x3.hpp>
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// stl
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#include <stdexcept>
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namespace mapnik {
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path_expression_ptr parse_path(std::string const& str)
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{
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namespace x3 = boost::spirit::x3;
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auto path = std::make_shared<path_expression>();
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using boost::spirit::x3::standard_wide::space;
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std::string::const_iterator itr = str.begin();
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std::string::const_iterator end = str.end();
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bool r = x3::phrase_parse(itr, end, grammar::path_expression, space, *path);
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if (r && itr == end)
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{
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return path;
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}
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else
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{
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throw std::runtime_error("Failed to parse path expression: \"" + str + "\"");
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}
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}
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namespace path_processor_detail {
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struct path_visitor_
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{
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path_visitor_(std::string& filename, feature_impl const& f)
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: filename_(filename)
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, feature_(f)
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{}
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void operator()(std::string const& token) const { filename_ += token; }
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void operator()(attribute const& attr) const
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{
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// convert mapnik::value to std::string
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value const& val = feature_.get(attr.name());
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filename_ += val.to_string();
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}
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std::string& filename_;
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feature_impl const& feature_;
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};
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struct to_string_
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{
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to_string_(std::string& str)
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: str_(str)
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{}
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void operator()(std::string const& token) const { str_ += token; }
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void operator()(attribute const& attr) const
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{
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str_ += "[";
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str_ += attr.name();
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str_ += "]";
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}
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std::string& str_;
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};
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struct collect_
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{
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collect_(std::set<std::string>& cont)
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: cont_(cont)
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{}
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void operator()(std::string const&) const {}
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void operator()(attribute const& attr) const { cont_.insert(attr.name()); }
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std::set<std::string>& cont_;
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};
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} // namespace path_processor_detail
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std::string path_processor::evaluate(path_expression const& path, feature_impl const& f)
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{
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std::string out;
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path_processor_detail::path_visitor_ eval(out, f);
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for (mapnik::path_component const& token : path)
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{
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util::apply_visitor(std::ref(eval), token);
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}
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return out;
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}
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std::string path_processor::to_string(path_expression const& path)
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{
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std::string str;
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path_processor_detail::to_string_ visitor(str);
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for (mapnik::path_component const& token : path)
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{
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util::apply_visitor(std::ref(visitor), token);
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}
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return str;
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}
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void path_processor::collect_attributes(path_expression const& path, std::set<std::string>& names)
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{
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path_processor_detail::collect_ visitor(names);
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for (mapnik::path_component const& token : path)
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{
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util::apply_visitor(std::ref(visitor), token);
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}
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}
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} // namespace mapnik
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