143 lines
4.1 KiB
C++
143 lines
4.1 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) 2010 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_PARSE_PATH_HPP
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#define MAPNIK_PARSE_PATH_HPP
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// mapnik
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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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// boost
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#include <boost/shared_ptr.hpp>
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#include <boost/variant.hpp>
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#include <boost/foreach.hpp>
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// stl
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#include <string>
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#include <vector>
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namespace mapnik {
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typedef boost::variant<std::string, attribute> path_component;
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typedef std::vector<path_component> path_expression;
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typedef boost::shared_ptr<path_expression> path_expression_ptr;
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MAPNIK_DECL path_expression_ptr parse_path(std::string const & str);
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template <typename T>
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struct path_processor
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{
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typedef T feature_type;
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struct path_visitor_ : boost::static_visitor<void>
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{
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path_visitor_ (std::string & filename, feature_type const& f)
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: filename_(filename),
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feature_(f) {}
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void operator() (std::string const& token) const
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{
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filename_ += token;
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}
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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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filename_ += attr.value<mapnik::value,feature_type>(feature_).to_string();
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}
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std::string & filename_;
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feature_type const& feature_;
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};
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struct to_string_ : boost::static_visitor<void>
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{
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to_string_ (std::string & str)
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: str_(str) {}
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void operator() (std::string const& token) const
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{
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str_ += token;
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}
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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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template <typename T1>
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struct collect_ : boost::static_visitor<void>
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{
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collect_ (T1 & cont)
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: cont_(cont) {}
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void operator() (std::string const& token) const
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{
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boost::ignore_unused_variable_warning(token);
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}
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void operator() (attribute const& attr) const
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{
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cont_.insert(attr.name());
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}
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T1 & cont_;
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};
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static std::string evaluate(path_expression const& path,feature_type const& f)
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{
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std::string out;
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path_visitor_ eval(out,f);
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BOOST_FOREACH( mapnik::path_component const& token, path)
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boost::apply_visitor(eval,token);
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return out;
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}
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static std::string to_string(path_expression const& path)
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{
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std::string str;
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to_string_ visitor(str);
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BOOST_FOREACH( mapnik::path_component const& token, path)
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boost::apply_visitor(visitor,token);
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return str;
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}
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template <typename T2>
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static void collect_attributes(path_expression const& path, T2 & names)
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{
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typedef T2 cont_type;
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collect_<cont_type> visitor(names);
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BOOST_FOREACH( mapnik::path_component const& token, path)
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boost::apply_visitor(visitor,token);
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}
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};
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typedef mapnik::path_processor<Feature> path_processor_type;
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}
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#endif //MAPNIK_PARSE_PATH_HPP
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