/usr/include/mapnik/parse_path.hpp is in libmapnik2-dev 2.0.0+ds1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2010 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_PARSE_PATH_HPP
#define MAPNIK_PARSE_PATH_HPP
// mapnik
#include <mapnik/attribute.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/value.hpp>
// boost
#include <boost/shared_ptr.hpp>
#include <boost/variant.hpp>
#include <boost/foreach.hpp>
// stl
#include <string>
#include <vector>
namespace mapnik {
typedef boost::variant<std::string, attribute> path_component;
typedef std::vector<path_component> path_expression;
typedef boost::shared_ptr<path_expression> path_expression_ptr;
path_expression_ptr parse_path(std::string const & str);
template <typename T>
struct path_processor
{
typedef T feature_type;
struct path_visitor_ : boost::static_visitor<void>
{
path_visitor_ (std::string & filename, feature_type const& f)
: filename_(filename),
feature_(f) {}
void operator() (std::string const& token) const
{
filename_ += token;
}
void operator() (attribute const& attr) const
{
// convert mapnik::value to std::string
filename_ += attr.value<mapnik::value,feature_type>(feature_).to_string();
}
std::string & filename_;
feature_type const& feature_;
};
struct to_string_ : boost::static_visitor<void>
{
to_string_ (std::string & str)
: str_(str) {}
void operator() (std::string const& token) const
{
str_ += token;
}
void operator() (attribute const& attr) const
{
str_ += "[";
str_ += attr.name();
str_ += "]";
}
std::string & str_;
};
template <typename T1>
struct collect_ : boost::static_visitor<void>
{
collect_ (T1 & cont)
: cont_(cont) {}
void operator() (std::string const& token) const
{
boost::ignore_unused_variable_warning(token);
}
void operator() (attribute const& attr) const
{
cont_.insert(attr.name());
}
T1 & cont_;
};
static std::string evaluate(path_expression const& path,feature_type const& f)
{
std::string out;
path_visitor_ eval(out,f);
BOOST_FOREACH( mapnik::path_component const& token, path)
boost::apply_visitor(eval,token);
return out;
}
static std::string to_string(path_expression const& path)
{
std::string str;
to_string_ visitor(str);
BOOST_FOREACH( mapnik::path_component const& token, path)
boost::apply_visitor(visitor,token);
return str;
}
template <typename T2>
static void collect_attributes(path_expression const& path, T2 & names)
{
typedef T2 cont_type;
collect_<cont_type> visitor(names);
BOOST_FOREACH( mapnik::path_component const& token, path)
boost::apply_visitor(visitor,token);
}
};
typedef mapnik::path_processor<Feature> path_processor_type;
}
#endif //MAPNIK_PARSE_PATH_HPP
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