+ boost.spirit WKT parser using mapnik::geometry_type
as synthesized attribute.
This commit is contained in:
Artem Pavlenko
parent
ef28bca095
commit
57db45095f
3 changed files with 228 additions and 0 deletions
36
include/mapnik/wkt/wkt_factory.hpp
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36
include/mapnik/wkt/wkt_factory.hpp
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/*****************************************************************************
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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_WKT_FACTORY_HPP
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#define MAPNIK_WKT_FACTORY_HPP
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#include <string>
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#include <mapnik/geometry.hpp>
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namespace mapnik {
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std::pair<bool,geometry_type*> from_wkt(std::string const& wkt);
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}
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#endif // MAPNIK_WKT_FACTORY_HPP
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148
include/mapnik/wkt/wkt_grammar.hpp
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148
include/mapnik/wkt/wkt_grammar.hpp
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/*****************************************************************************
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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_WKT_GRAMMAR_HPP
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#define MAPNIK_WKT_GRAMMAR_HPP
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#include <boost/assert.hpp>
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#include <boost/ptr_container/ptr_vector.hpp>
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// spirit::qi
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#include <boost/spirit/include/qi.hpp>
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// spirit::phoenix
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#include <boost/spirit/include/phoenix_function.hpp>
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#include <boost/spirit/include/phoenix_core.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/spirit/include/phoenix_fusion.hpp>
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#include <boost/spirit/home/phoenix/object/new.hpp>
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// mapnik
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#include <mapnik/geometry.hpp>
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namespace mapnik { namespace wkt {
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using namespace boost::spirit;
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using namespace boost::fusion;
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using namespace boost::phoenix;
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struct push_vertex
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{
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template <typename T0,typename T1, typename T2, typename T3>
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struct result
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{
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typedef void type;
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};
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template <typename T0,typename T1, typename T2, typename T3>
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void operator() (T0 c, T1 path, T2 x, T3 y) const
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{
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BOOST_ASSERT( path!=0 );
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path->push_vertex(x,y,c);
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}
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};
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struct cleanup
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{
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template <typename T0>
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struct result
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{
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typedef void type;
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};
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template <typename T0>
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void operator() (T0 & path) const
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{
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if (path) delete path,path=0;
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}
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};
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template <typename Iterator>
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struct wkt_grammar : qi::grammar<Iterator, geometry_type*(), ascii::space_type>
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{
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wkt_grammar()
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: wkt_grammar::base_type(start)
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{
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using qi::no_case;
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start %= point | linestring | polygon | multipoint | multilinestring | multipolygon | eps[cleanup_(_val)][_pass = false];
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// <point tagged text> ::= point <point text>
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point = no_case[lit("POINT")] [ _val = new_<geometry_type>(Point) ]
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>> (empty_set | lit('(') >> coord(SEG_MOVETO,_val) >> lit(')'));
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// <linestring tagged text> ::= linestring <linestring text>
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linestring = no_case[lit("LINESTRING")] [ _val = new_<geometry_type>(LineString) ] >> (empty_set | points(_val));
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// <polygon tagged text> ::= polygon <polygon text>
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polygon = no_case[lit("POLYGON")] [ _val = new_<geometry_type>(Polygon) ] >>
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(empty_set | lit('(') >> points(_val) % lit(',') >> lit(')'));
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// multi point
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multipoint = no_case[lit("MULTIPOINT")] [ _val = new_<geometry_type>(MultiPoint) ]
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>> (empty_set | lit('(') >> coord(SEG_MOVETO,_val) % lit(',') >> ')');
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// multi linestring
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multilinestring = no_case[lit("MULTILINESTRING")] [ _val = new_<geometry_type>(MultiLineString) ]>>
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(empty_set | lit('(') >> points(_val) % lit(',') >> ')');
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// multi polygon
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multipolygon = no_case[lit("MULTIPOLYGON")] [ _val = new_<geometry_type>(MultiPolygon)] >>
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(empty_set | lit('(') >> (lit('(') >>
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points(_val) % ',' >> ')') % ',' >> ')');
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// points
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points = lit('(')[_a = SEG_MOVETO] >> coord (_a,_r1) % lit(',') [_a = SEG_LINETO] >> ')';
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coord = (double_ >> double_) [push_vertex_(_r1,_r2,_1,_2)];
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// <empty set>
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empty_set = no_case[lit("EMPTY")];
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}
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qi::rule<Iterator,geometry_type*(),ascii::space_type> start;
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qi::rule<Iterator,geometry_type*(),ascii::space_type> point;
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qi::rule<Iterator,geometry_type*(),ascii::space_type> multipoint;
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qi::rule<Iterator,geometry_type*(),ascii::space_type> linestring;
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qi::rule<Iterator,geometry_type*(),ascii::space_type> multilinestring;
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qi::rule<Iterator,geometry_type*(),ascii::space_type> polygon;
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qi::rule<Iterator,geometry_type*(),ascii::space_type> multipolygon;
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qi::rule<Iterator,void(CommandType,geometry_type*),ascii::space_type> coord;
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qi::rule<Iterator,qi::locals<CommandType>,void(geometry_type*),ascii::space_type> points;
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qi::rule<Iterator,ascii::space_type> empty_set;
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boost::phoenix::function<push_vertex> push_vertex_;
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boost::phoenix::function<cleanup> cleanup_;
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};
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template <typename Iterator>
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struct wkt_list_grammar : qi::grammar<Iterator, boost::ptr_vector<mapnik::geometry_type>(), ascii::space_type>
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{
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wkt_list_grammar()
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: wkt_list_grammar::base_type(start)
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{
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start = *wkt;
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}
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qi::rule<Iterator,boost::ptr_vector<mapnik::geometry_type>(),ascii::space_type> start;
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wkt_grammar<Iterator> wkt;
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};
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}}
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#endif // MAPNIK_WKT_GRAMMAR_HPP
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44
src/wkt/wkt_factory.cpp
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44
src/wkt/wkt_factory.cpp
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@ -0,0 +1,44 @@
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/*****************************************************************************
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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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#include "wkt_factory.hpp"
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#include "wkt_grammar.hpp"
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#include <string>
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namespace mapnik
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{
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std::pair<bool,geometry_type*> from_wkt(std::string const& wkt)
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{
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using namespace boost::spirit;
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typedef std::string::const_iterator iterator_type;
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iterator_type first = wkt.begin();
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iterator_type last = wkt.end();
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geometry_type * path = 0;
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mapnik::wkt::wkt_grammar<iterator_type> grammar;
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bool result = qi::phrase_parse(first, last, grammar, ascii::space,path);
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return std::make_pair(result, path);
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}
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}
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