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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2006 Artem Pavlenko, Jean-Francois Doyon
*
* 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
*
*****************************************************************************/
// boost
#include <boost/python.hpp>
#include <boost/variant.hpp>
#include <boost/noncopyable.hpp>
// mapnik
#include <mapnik/feature.hpp>
#include <mapnik/expression.hpp>
#include <mapnik/expression_string.hpp>
#include <mapnik/expression_evaluator.hpp>
#include <mapnik/parse_path.hpp>
#include <mapnik/value.hpp>
using mapnik::expression_ptr;
using mapnik::parse_expression;
using mapnik::to_expression_string;
using mapnik::path_expression_ptr;
// expression
expression_ptr parse_expression_(std::string const& wkt)
{
return parse_expression(wkt,"utf8");
}
std::string expression_to_string_(mapnik::expr_node const& expr)
{
return mapnik::to_expression_string(expr);
}
mapnik::value expression_evaluate_(mapnik::expr_node const& expr, mapnik::feature_impl const& f)
{
// will be auto-converted to proper python type by `mapnik_value_to_python`
return boost::apply_visitor(mapnik::evaluate<mapnik::feature_impl,mapnik::value>(f),expr);
}
bool expression_evaluate_to_bool_(mapnik::expr_node const& expr, mapnik::feature_impl const& f)
{
return boost::apply_visitor(mapnik::evaluate<mapnik::feature_impl,mapnik::value>(f),expr).to_bool();
}
// path expression
path_expression_ptr parse_path_(std::string const& path)
{
return mapnik::parse_path(path);
}
std::string path_to_string_(mapnik::path_expression const& expr)
{
return mapnik::path_processor_type::to_string(expr);
}
std::string path_evaluate_(mapnik::path_expression const& expr, mapnik::feature_impl const& f)
{
return mapnik::path_processor_type::evaluate(expr, f);
}
void export_expression()
{
using namespace boost::python;
class_<mapnik::expr_node ,boost::noncopyable>("Expression",
"TODO"
"",no_init)
.def("evaluate", &expression_evaluate_)
.def("to_bool", &expression_evaluate_to_bool_)
.def("__str__",&expression_to_string_);
;
def("Expression",&parse_expression_,(arg("expr")),"Expression string");
class_<mapnik::path_expression ,boost::noncopyable>("PathExpression",
"TODO"
"",no_init)
.def("evaluate", &path_evaluate_) // note: "pass" is a reserved word in Python
.def("__str__",&path_to_string_);
;
def("PathExpression",&parse_path_,(arg("expr")),"PathExpression string");
}
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