150 lines
4.3 KiB
C++
150 lines
4.3 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2011 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#include <mapnik/parse_path.hpp>
|
|
#include <mapnik/path_expression_grammar.hpp>
|
|
|
|
#include <mapnik/config.hpp>
|
|
#include <mapnik/attribute.hpp>
|
|
#include <mapnik/feature.hpp>
|
|
#include <mapnik/value.hpp>
|
|
|
|
// boost
|
|
#include <boost/variant.hpp>
|
|
#include <boost/foreach.hpp>
|
|
#include <boost/make_shared.hpp>
|
|
|
|
namespace mapnik {
|
|
|
|
path_expression_ptr parse_path(std::string const& str)
|
|
{
|
|
path_expression_grammar<std::string::const_iterator> g;
|
|
return parse_path(str,g);
|
|
}
|
|
|
|
path_expression_ptr parse_path(std::string const& str,
|
|
path_expression_grammar<std::string::const_iterator> const& g)
|
|
{
|
|
path_expression path;
|
|
|
|
std::string::const_iterator itr = str.begin();
|
|
std::string::const_iterator end = str.end();
|
|
bool r = qi::phrase_parse(itr, end, g, boost::spirit::standard_wide::space, path);
|
|
if (r && itr == end)
|
|
{
|
|
return boost::make_shared<path_expression>(path); //path;
|
|
}
|
|
else
|
|
{
|
|
throw std::runtime_error("Failed to parse path expression: \"" + str + "\"");
|
|
}
|
|
}
|
|
|
|
namespace path_processor_detail {
|
|
struct path_visitor_ : boost::static_visitor<void>
|
|
{
|
|
path_visitor_ (std::string & filename, feature_impl 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
|
|
value const& val = feature_.get(attr.name());
|
|
filename_ += val.to_string();
|
|
}
|
|
|
|
std::string & filename_;
|
|
feature_impl 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_;
|
|
};
|
|
|
|
struct collect_ : boost::static_visitor<void>
|
|
{
|
|
collect_ (std::set<std::string> & 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());
|
|
}
|
|
|
|
std::set<std::string> & cont_;
|
|
};
|
|
}
|
|
|
|
std::string path_processor::evaluate(path_expression const& path,feature_impl const& f)
|
|
{
|
|
std::string out;
|
|
path_processor_detail::path_visitor_ eval(out,f);
|
|
BOOST_FOREACH( mapnik::path_component const& token, path)
|
|
boost::apply_visitor(eval,token);
|
|
return out;
|
|
}
|
|
|
|
std::string path_processor::to_string(path_expression const& path)
|
|
{
|
|
std::string str;
|
|
path_processor_detail::to_string_ visitor(str);
|
|
BOOST_FOREACH( mapnik::path_component const& token, path)
|
|
boost::apply_visitor(visitor,token);
|
|
return str;
|
|
}
|
|
|
|
void path_processor::collect_attributes(path_expression const& path, std::set<std::string>& names)
|
|
{
|
|
path_processor_detail::collect_ visitor(names);
|
|
BOOST_FOREACH( mapnik::path_component const& token, path)
|
|
boost::apply_visitor(visitor,token);
|
|
}
|
|
|
|
|
|
}
|