508 lines
15 KiB
C++
508 lines
15 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) 2021 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_SYMBOLIZER_UTILS_HPP
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#define MAPNIK_SYMBOLIZER_UTILS_HPP
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// mapnik
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#include <mapnik/symbolizer_keys.hpp>
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#include <mapnik/raster_colorizer.hpp>
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#include <mapnik/path_expression.hpp>
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#include <mapnik/parse_path.hpp>
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#include <mapnik/color.hpp>
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#include <mapnik/expression.hpp>
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#include <mapnik/color_factory.hpp>
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#include <mapnik/symbolizer.hpp>
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#include <mapnik/xml_tree.hpp>
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#include <mapnik/config_error.hpp>
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#include <mapnik/evaluate_global_attributes.hpp>
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#include <mapnik/transform/transform_processor.hpp>
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#include <mapnik/transform/parse_transform.hpp>
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#include <mapnik/util/dasharray_parser.hpp>
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#include <mapnik/util/variant.hpp>
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namespace mapnik {
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template<typename Symbolizer>
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struct symbolizer_traits
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{
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static char const* name() { return "Unknown"; }
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};
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template<>
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struct symbolizer_traits<point_symbolizer>
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{
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static char const* name() { return "PointSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<line_symbolizer>
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{
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static char const* name() { return "LineSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<polygon_symbolizer>
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{
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static char const* name() { return "PolygonSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<text_symbolizer>
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{
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static char const* name() { return "TextSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<line_pattern_symbolizer>
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{
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static char const* name() { return "LinePatternSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<polygon_pattern_symbolizer>
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{
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static char const* name() { return "PolygonPatternSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<markers_symbolizer>
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{
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static char const* name() { return "MarkersSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<shield_symbolizer>
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{
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static char const* name() { return "ShieldSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<raster_symbolizer>
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{
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static char const* name() { return "RasterSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<building_symbolizer>
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{
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static char const* name() { return "BuildingSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<group_symbolizer>
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{
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static char const* name() { return "GroupSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<debug_symbolizer>
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{
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static char const* name() { return "DebugSymbolizer"; }
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};
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template<>
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struct symbolizer_traits<dot_symbolizer>
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{
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static char const* name() { return "DotSymbolizer"; }
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};
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// symbolizer name impl
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namespace detail {
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struct symbolizer_name_impl
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{
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public:
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template<typename Symbolizer>
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std::string operator()(Symbolizer const&) const
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{
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return symbolizer_traits<Symbolizer>::name();
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}
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};
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} // namespace detail
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inline std::string symbolizer_name(symbolizer const& sym)
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{
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std::string type = util::apply_visitor(detail::symbolizer_name_impl(), sym);
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return type;
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}
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// https://github.com/mapnik/mapnik/issues/2324
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/*
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template <typename Meta>
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class symbolizer_property_value_string
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{
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public:
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symbolizer_property_value_string (Meta const& meta)
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: meta_(meta) {}
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std::string operator() ( mapnik::enumeration_wrapper const& e) const
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{
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std::stringstream ss;
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auto const& convert_fun_ptr(std::get<1>(meta_));
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if ( convert_fun_ptr )
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{
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ss << convert_fun_ptr(e);
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}
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return ss.str();
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}
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std::string operator () ( path_expression_ptr const& expr) const
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{
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std::ostringstream ss;
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if (expr)
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{
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ss << '\"' << path_processor::to_string(*expr) << '\"';
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}
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return ss.str();
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}
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std::string operator () (text_placements_ptr const& expr) const
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{
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return std::string("\"<fixme-text-placement-ptr>\"");
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}
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std::string operator () (raster_colorizer_ptr const& expr) const
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{
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return std::string("\"<fixme-raster-colorizer-ptr>\"");
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}
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std::string operator () (transform_type const& expr) const
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{
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std::ostringstream ss;
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if (expr)
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{
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ss << '\"' << transform_processor_type::to_string(*expr) << '\"';
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}
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return ss.str();
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}
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std::string operator () (expression_ptr const& expr) const
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{
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std::ostringstream ss;
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if (expr)
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{
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ss << '\"' << "FIXME" << '\"';
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}
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return ss.str();
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}
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std::string operator () (color const& c) const
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{
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std::ostringstream ss;
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ss << '\"' << c << '\"';
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return ss.str();
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}
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std::string operator () (dash_array const& dash) const
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{
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std::ostringstream ss;
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for (std::size_t i = 0; i < dash.size(); ++i)
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{
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ss << dash[i].first << ", " << dash[i].second;
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if ( i + 1 < dash.size() ) ss << ',';
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}
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return ss.str();
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}
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template <typename T>
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std::string operator () ( T const& val ) const
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{
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std::ostringstream ss;
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ss << val;
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return ss.str();
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}
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private:
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Meta const& meta_;
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};
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struct symbolizer_to_json
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{
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using result_type = std::string;
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template <typename T>
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auto operator() (T const& sym) const -> result_type
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{
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std::stringstream ss;
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ss << "{\"type\":\"" << mapnik::symbolizer_traits<T>::name() << "\",";
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ss << "\"properties\":{";
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bool first = true;
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for (auto const& prop : sym.properties)
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{
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auto const& meta = mapnik::get_meta(prop.first);
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if (first) first = false;
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else ss << ",";
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ss << "\"" << std::get<0>(meta) << "\":";
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ss << util::apply_visitor(symbolizer_property_value_string<property_meta_type>(meta),prop.second);
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}
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ss << "}}";
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return ss.str();
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}
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};
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*/
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namespace {
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template<typename Symbolizer, typename T>
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struct set_property_impl
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{
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static void apply(Symbolizer&, mapnik::keys, std::string const&) { std::cerr << "do nothing" << std::endl; }
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};
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template<typename Symbolizer>
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struct set_property_impl<Symbolizer, std::integral_constant<property_types, property_types::target_color>>
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{
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static void apply(Symbolizer& sym, mapnik::keys key, std::string const& val)
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{
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put(sym, key, mapnik::parse_color(val));
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}
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};
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template<typename Symbolizer>
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struct set_property_impl<Symbolizer, std::integral_constant<property_types, property_types::target_double>>
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{
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static void apply(Symbolizer&, mapnik::keys, std::string const&) { std::cerr << " expects double" << std::endl; }
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};
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template<typename Symbolizer>
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struct set_property_impl<Symbolizer, std::integral_constant<property_types, property_types::target_bool>>
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{
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static void apply(Symbolizer&, mapnik::keys, std::string const&) { std::cerr << " expects bool" << std::endl; }
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};
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} // namespace
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template<typename Symbolizer, typename T>
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inline void set_property(Symbolizer& sym, mapnik::keys key, T const& val)
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{
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switch (std::get<2>(get_meta(key)))
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{
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case property_types::target_bool:
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set_property_impl<Symbolizer, std::integral_constant<property_types, property_types::target_bool>>::apply(
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sym,
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key,
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val);
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break;
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case property_types::target_integer:
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set_property_impl<Symbolizer,
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std::integral_constant<property_types, property_types::target_integer>>::apply(sym,
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key,
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val);
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break;
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case property_types::target_double:
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set_property_impl<Symbolizer, std::integral_constant<property_types, property_types::target_double>>::apply(
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sym,
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key,
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val);
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break;
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case property_types::target_color:
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set_property_impl<Symbolizer, std::integral_constant<property_types, property_types::target_color>>::apply(
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sym,
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key,
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val);
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break;
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default:
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break;
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}
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}
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template<typename Symbolizer, typename T>
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inline void set_property_from_value(Symbolizer& sym, mapnik::keys key, T const& val)
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{
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switch (std::get<2>(get_meta(key)))
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{
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case property_types::target_bool:
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put(sym, key, val.to_bool());
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break;
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case property_types::target_integer:
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put(sym, key, val.to_int());
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break;
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case property_types::target_double:
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put(sym, key, val.to_double());
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break;
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case property_types::target_color:
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put(sym, key, mapnik::parse_color(val.to_string()));
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break;
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default:
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break;
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}
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}
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namespace detail {
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// helpers
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template<typename Symbolizer, typename T, bool is_enum = false>
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struct set_symbolizer_property_impl
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{
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static void apply(Symbolizer& sym, keys key, std::string const& name, xml_node const& node)
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{
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using value_type = T;
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try
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{
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boost::optional<value_type> val = node.get_opt_attr<value_type>(name);
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if (val)
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put(sym, key, *val);
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}
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catch (config_error const& ex)
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{
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// try parsing as an expression
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boost::optional<expression_ptr> val = node.get_opt_attr<expression_ptr>(name);
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if (val)
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{
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// first try pre-evaluate expressions which don't have dynamic properties
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auto result = pre_evaluate_expression<mapnik::value>(*val);
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if (std::get<1>(result))
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{
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set_property_from_value(sym, key, std::get<0>(result));
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}
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else
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{
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// expression_ptr
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put(sym, key, *val);
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}
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}
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else
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{
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throw;
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}
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}
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}
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};
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template<typename Symbolizer>
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struct set_symbolizer_property_impl<Symbolizer, transform_type, false>
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{
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static void apply(Symbolizer& sym, keys key, std::string const& name, xml_node const& node)
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{
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boost::optional<std::string> transform = node.get_opt_attr<std::string>(name);
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if (transform)
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put(sym, key, mapnik::parse_transform(*transform));
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}
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};
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template<typename Symbolizer>
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struct set_symbolizer_property_impl<Symbolizer, dash_array, false>
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{
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static void apply(Symbolizer& sym, keys key, std::string const& name, xml_node const& node)
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{
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boost::optional<std::string> str = node.get_opt_attr<std::string>(name);
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if (str)
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{
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dash_array dash;
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if (util::parse_dasharray(*str, dash))
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{
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put(sym, key, dash);
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}
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else
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{
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boost::optional<expression_ptr> val = node.get_opt_attr<expression_ptr>(name);
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if (val)
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{
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// first try pre-evaluate expressions which don't have dynamic properties
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auto result = pre_evaluate_expression<mapnik::value>(*val);
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if (std::get<1>(result))
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{
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set_property_from_value(sym, key, std::get<0>(result));
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}
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else
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{
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// expression_ptr
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put(sym, key, *val);
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}
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}
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else
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{
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throw config_error(std::string("Failed to parse dasharray ") + "'. Expected a " +
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"list of floats or 'none' but got '" + (*str) + "'");
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}
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}
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}
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}
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};
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template<typename Symbolizer, typename T>
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struct set_symbolizer_property_impl<Symbolizer, T, true>
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{
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static void apply(Symbolizer& sym, keys key, std::string const& name, xml_node const& node)
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{
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using value_type = T;
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boost::optional<std::string> enum_str = node.get_opt_attr<std::string>(name);
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if (enum_str)
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{
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boost::optional<value_type> enum_val = detail::enum_traits<value_type>::from_string(*enum_str);
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if (enum_val)
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{
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put(sym, key, *enum_val);
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}
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else
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{
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boost::optional<expression_ptr> val = node.get_opt_attr<expression_ptr>(name);
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if (val)
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{
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// first try pre-evaluating expression
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auto result = pre_evaluate_expression<value>(*val);
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if (std::get<1>(result))
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{
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boost::optional<value_type> enum_val2 =
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detail::enum_traits<value_type>::from_string(std::get<0>(result).to_string());
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if (enum_val2)
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{
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put(sym, key, *enum_val);
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}
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else
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{
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// can't evaluate
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throw config_error("failed to parse '" + name + "'");
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}
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}
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else
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{
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// put expression_ptr
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put(sym, key, *val);
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}
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}
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else
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{
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throw config_error("failed to parse '" + name + "'");
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}
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}
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}
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}
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};
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} // namespace detail
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template<typename Symbolizer, typename T>
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void set_symbolizer_property(Symbolizer& sym, keys key, xml_node const& node)
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{
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std::string const& name = std::get<0>(get_meta(key));
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if (node.has_attribute(name))
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{
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detail::set_symbolizer_property_impl<Symbolizer, T, std::is_enum<T>::value>::apply(sym, key, name, node);
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}
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}
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} // namespace mapnik
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#endif // MAPNIK_SYMBOLIZER_UTILS_HPP
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