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/*****************************************************************************
*
* 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
*
*****************************************************************************/
#ifndef MAPNIK_ATTRIBUTE_COLLECTOR_HPP
#define MAPNIK_ATTRIBUTE_COLLECTOR_HPP
// mapnik
#include <mapnik/rule.hpp>
#include <mapnik/transform_processor.hpp>
// boost
#include <boost/utility.hpp>
#include <boost/variant.hpp>
#include <boost/concept_check.hpp>
// stl
#include <set>
#include <iostream>
namespace mapnik {
template <typename Container>
struct expression_attributes : boost::static_visitor<void>
{
explicit expression_attributes(Container& names)
: names_(names) {}
void operator() (value_type const& x) const
{
boost::ignore_unused_variable_warning(x);
}
void operator() (geometry_type_attribute const& type) const
{
// do nothing
}
void operator() (attribute const& attr) const
{
names_.insert(attr.name());
}
template <typename Tag>
void operator() (binary_node<Tag> const& x) const
{
boost::apply_visitor(*this, x.left);
boost::apply_visitor(*this, x.right);
}
template <typename Tag>
void operator() (unary_node<Tag> const& x) const
{
boost::apply_visitor(*this, x.expr);
}
void operator() (regex_match_node const& x) const
{
boost::apply_visitor(*this, x.expr);
}
void operator() (regex_replace_node const& x) const
{
boost::apply_visitor(*this, x.expr);
}
private:
Container& names_;
};
struct symbolizer_attributes : public boost::static_visitor<>
{
symbolizer_attributes(std::set<std::string>& names)
: names_(names), f_attr(names) {}
template <typename T>
void operator () (T const&) const {}
void operator () (text_symbolizer const& sym)
{
expression_set::const_iterator it;
expression_set expressions;
sym.get_placement_options()->add_expressions(expressions);
for (it=expressions.begin(); it != expressions.end(); it++)
{
if (*it) boost::apply_visitor(f_attr, **it);
}
collect_transform(sym.get_transform());
}
void operator () (point_symbolizer const& sym)
{
path_expression_ptr const& filename_expr = sym.get_filename();
if (filename_expr)
{
path_processor_type::collect_attributes(*filename_expr,names_);
}
collect_transform(sym.get_image_transform());
collect_transform(sym.get_transform());
}
void operator () (line_symbolizer const& sym)
{
collect_transform(sym.get_transform());
}
void operator () (line_pattern_symbolizer const& sym)
{
path_expression_ptr const& filename_expr = sym.get_filename();
if (filename_expr)
{
path_processor_type::collect_attributes(*filename_expr,names_);
}
collect_transform(sym.get_image_transform());
collect_transform(sym.get_transform());
}
void operator () (polygon_symbolizer const& sym)
{
collect_transform(sym.get_transform());
}
void operator () (polygon_pattern_symbolizer const& sym)
{
path_expression_ptr const& filename_expr = sym.get_filename();
if (filename_expr)
{
path_processor_type::collect_attributes(*filename_expr,names_);
}
collect_transform(sym.get_image_transform());
collect_transform(sym.get_transform());
}
void operator () (shield_symbolizer const& sym)
{
expression_set::const_iterator it;
expression_set expressions;
sym.get_placement_options()->add_expressions(expressions);
for (it=expressions.begin(); it != expressions.end(); it++)
{
if (*it) boost::apply_visitor(f_attr, **it);
}
path_expression_ptr const& filename_expr = sym.get_filename();
if (filename_expr)
{
path_processor_type::collect_attributes(*filename_expr,names_);
}
collect_transform(sym.get_image_transform());
collect_transform(sym.get_transform());
}
void operator () (markers_symbolizer const& sym)
{
expression_ptr const& height_expr = sym.get_height();
if (height_expr)
{
boost::apply_visitor(f_attr,*height_expr);
}
expression_ptr const& width_expr = sym.get_width();
if (width_expr)
{
boost::apply_visitor(f_attr,*width_expr);
}
collect_transform(sym.get_image_transform());
collect_transform(sym.get_transform());
}
void operator () (building_symbolizer const& sym)
{
expression_ptr const& height_expr = sym.height();
if (height_expr)
{
boost::apply_visitor(f_attr,*height_expr);
}
collect_transform(sym.get_transform());
}
// TODO - support remaining syms
private:
std::set<std::string>& names_;
expression_attributes<std::set<std::string> > f_attr;
void collect_transform(transform_list_ptr const& trans_expr)
{
if (trans_expr)
{
transform_processor_type::collect_attributes(names_, *trans_expr);
}
}
};
class attribute_collector : public boost::noncopyable
{
private:
std::set<std::string>& names_;
expression_attributes<std::set<std::string> > f_attr;
public:
attribute_collector(std::set<std::string>& names)
: names_(names), f_attr(names) {}
template <typename RuleType>
void operator() (RuleType const& r)
{
symbolizers const& symbols = r.get_symbolizers();
symbolizers::const_iterator symIter=symbols.begin();
symbolizer_attributes s_attr(names_);
while (symIter != symbols.end())
{
boost::apply_visitor(s_attr,*symIter++);
}
expression_ptr const& expr = r.get_filter();
boost::apply_visitor(f_attr,*expr);
}
};
struct directive_collector : public boost::static_visitor<>
{
directive_collector(double & filter_factor)
: filter_factor_(filter_factor) {}
template <typename T>
void operator () (T const&) const {}
void operator () (raster_symbolizer const& sym)
{
filter_factor_ = sym.calculate_filter_factor();
}
private:
double & filter_factor_;
};
} // namespace mapnik
#endif // MAPNIK_ATTRIBUTE_COLLECTOR_HPP
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