276 lines
8.1 KiB
C++
276 lines
8.1 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) 2011 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_ATTRIBUTE_COLLECTOR_HPP
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#define MAPNIK_ATTRIBUTE_COLLECTOR_HPP
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// mapnik
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#include <mapnik/transform_processor.hpp>
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#include <mapnik/noncopyable.hpp>
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#include <mapnik/attribute.hpp>
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#include <mapnik/symbolizer.hpp> // for transform_list_ptr
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#include <mapnik/building_symbolizer.hpp>
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#include <mapnik/line_symbolizer.hpp>
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#include <mapnik/line_pattern_symbolizer.hpp>
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#include <mapnik/polygon_symbolizer.hpp>
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#include <mapnik/polygon_pattern_symbolizer.hpp>
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#include <mapnik/point_symbolizer.hpp>
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#include <mapnik/raster_symbolizer.hpp>
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#include <mapnik/shield_symbolizer.hpp>
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#include <mapnik/text_symbolizer.hpp>
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#include <mapnik/markers_symbolizer.hpp>
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#include <mapnik/rule.hpp> // for rule::symbolizers
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#include <mapnik/expression.hpp> // for expression_ptr, etc
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#include <mapnik/expression_node_types.hpp>
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#include <mapnik/expression_node.hpp>
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#include <mapnik/parse_path.hpp> // for path_processor_type
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#include <mapnik/path_expression.hpp> // for path_expression_ptr
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#include <mapnik/text_placements/base.hpp> // for text_placements
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// boost
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/apply_visitor.hpp>
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// stl
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#include <set>
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namespace mapnik {
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template <typename Container>
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struct expression_attributes : boost::static_visitor<void>
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{
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explicit expression_attributes(Container& names)
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: names_(names) {}
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void operator() (value_type const& /*x*/) const
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{
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}
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void operator() (geometry_type_attribute const& /*type*/) const
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{
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// do nothing
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}
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void operator() (attribute const& attr) const
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{
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names_.insert(attr.name());
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}
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template <typename Tag>
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void operator() (binary_node<Tag> const& x) const
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{
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boost::apply_visitor(*this, x.left);
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boost::apply_visitor(*this, x.right);
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}
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template <typename Tag>
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void operator() (unary_node<Tag> const& x) const
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{
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boost::apply_visitor(*this, x.expr);
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}
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void operator() (regex_match_node const& x) const
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{
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boost::apply_visitor(*this, x.expr);
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}
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void operator() (regex_replace_node const& x) const
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{
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boost::apply_visitor(*this, x.expr);
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}
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private:
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Container& names_;
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};
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struct symbolizer_attributes : public boost::static_visitor<>
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{
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symbolizer_attributes(std::set<std::string>& names,
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double & filter_factor)
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: names_(names),
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filter_factor_(filter_factor),
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f_attr(names) {}
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template <typename T>
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void operator () (T const&) const {}
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void operator () (text_symbolizer const& sym)
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{
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expression_set::const_iterator it;
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expression_set expressions;
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sym.get_placement_options()->add_expressions(expressions);
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for (it=expressions.begin(); it != expressions.end(); it++)
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{
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if (*it) boost::apply_visitor(f_attr, **it);
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}
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collect_transform(sym.get_transform());
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}
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void operator () (point_symbolizer const& sym)
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{
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path_expression_ptr const& filename_expr = sym.get_filename();
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if (filename_expr)
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{
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path_processor_type::collect_attributes(*filename_expr,names_);
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}
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collect_transform(sym.get_image_transform());
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collect_transform(sym.get_transform());
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}
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void operator () (line_symbolizer const& sym)
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{
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collect_transform(sym.get_transform());
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}
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void operator () (line_pattern_symbolizer const& sym)
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{
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path_expression_ptr const& filename_expr = sym.get_filename();
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if (filename_expr)
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{
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path_processor_type::collect_attributes(*filename_expr,names_);
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}
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collect_transform(sym.get_image_transform());
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collect_transform(sym.get_transform());
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}
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void operator () (polygon_symbolizer const& sym)
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{
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collect_transform(sym.get_transform());
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}
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void operator () (polygon_pattern_symbolizer const& sym)
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{
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path_expression_ptr const& filename_expr = sym.get_filename();
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if (filename_expr)
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{
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path_processor_type::collect_attributes(*filename_expr,names_);
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}
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collect_transform(sym.get_image_transform());
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collect_transform(sym.get_transform());
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}
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void operator () (shield_symbolizer const& sym)
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{
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expression_set::const_iterator it;
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expression_set expressions;
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sym.get_placement_options()->add_expressions(expressions);
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for (it=expressions.begin(); it != expressions.end(); it++)
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{
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if (*it) boost::apply_visitor(f_attr, **it);
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}
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path_expression_ptr const& filename_expr = sym.get_filename();
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if (filename_expr)
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{
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path_processor_type::collect_attributes(*filename_expr,names_);
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}
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collect_transform(sym.get_image_transform());
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collect_transform(sym.get_transform());
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}
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void operator () (markers_symbolizer const& sym)
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{
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expression_ptr const& height_expr = sym.get_height();
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if (height_expr)
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{
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boost::apply_visitor(f_attr,*height_expr);
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}
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expression_ptr const& width_expr = sym.get_width();
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if (width_expr)
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{
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boost::apply_visitor(f_attr,*width_expr);
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}
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path_expression_ptr const& filename_expr = sym.get_filename();
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if (filename_expr)
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{
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path_processor_type::collect_attributes(*filename_expr,names_);
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}
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collect_transform(sym.get_image_transform());
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collect_transform(sym.get_transform());
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}
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void operator () (building_symbolizer const& sym)
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{
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expression_ptr const& height_expr = sym.height();
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if (height_expr)
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{
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boost::apply_visitor(f_attr,*height_expr);
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}
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collect_transform(sym.get_transform());
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}
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void operator () (raster_symbolizer const& sym)
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{
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filter_factor_ = sym.calculate_filter_factor();
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}
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private:
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std::set<std::string>& names_;
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double & filter_factor_;
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expression_attributes<std::set<std::string> > f_attr;
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void collect_transform(transform_list_ptr const& trans_expr)
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{
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if (trans_expr)
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{
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transform_processor_type::collect_attributes(names_, *trans_expr);
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}
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}
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};
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class attribute_collector : public mapnik::noncopyable
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{
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private:
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std::set<std::string>& names_;
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double filter_factor_;
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expression_attributes<std::set<std::string> > f_attr;
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public:
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attribute_collector(std::set<std::string>& names)
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: names_(names),
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filter_factor_(1.0),
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f_attr(names) {}
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template <typename RuleType>
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void operator() (RuleType const& r)
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{
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typename RuleType::symbolizers const& symbols = r.get_symbolizers();
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typename RuleType::symbolizers::const_iterator symIter=symbols.begin();
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symbolizer_attributes s_attr(names_,filter_factor_);
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while (symIter != symbols.end())
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{
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boost::apply_visitor(s_attr,*symIter++);
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}
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expression_ptr const& expr = r.get_filter();
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boost::apply_visitor(f_attr,*expr);
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}
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double get_filter_factor() const
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{
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return filter_factor_;
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}
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};
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} // namespace mapnik
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#endif // MAPNIK_ATTRIBUTE_COLLECTOR_HPP
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