125 lines
4.1 KiB
C++
125 lines
4.1 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_EXPRESSION_EVALUATOR_HPP
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#define MAPNIK_EXPRESSION_EVALUATOR_HPP
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// mapnik
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#include <mapnik/attribute.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/expression_node.hpp>
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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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#include <boost/regex.hpp>
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#if defined(BOOST_REGEX_HAS_ICU)
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#include <boost/regex/icu.hpp>
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#endif
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namespace mapnik
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{
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template <typename T0, typename T1>
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struct evaluate : boost::static_visitor<T1>
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{
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typedef T0 feature_type;
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typedef T1 value_type;
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explicit evaluate(feature_type const& f)
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: feature_(f) {}
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value_type operator() (value_type x) const
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{
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return x;
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}
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value_type operator() (attribute const& attr) const
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{
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return attr.value<value_type,feature_type>(feature_);
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}
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value_type operator() (geometry_type_attribute const& geom) const
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{
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return geom.value<value_type,feature_type>(feature_);
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}
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value_type operator() (binary_node<tags::logical_and> const & x) const
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{
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return (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.left).to_bool())
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&& (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.right).to_bool());
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}
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value_type operator() (binary_node<tags::logical_or> const & x) const
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{
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return (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.left).to_bool())
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|| (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.right).to_bool());
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}
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template <typename Tag>
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value_type operator() (binary_node<Tag> const& x) const
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{
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typename make_op<Tag>::type operation;
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return operation(boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.left),
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boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.right));
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}
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template <typename Tag>
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value_type operator() (unary_node<Tag> const& x) const
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{
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typename make_op<Tag>::type func;
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return func(boost::apply_visitor(*this, x.expr));
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}
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value_type operator() (unary_node<tags::logical_not> const& x) const
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{
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return ! (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.expr).to_bool());
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}
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value_type operator() (regex_match_node const& x) const
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{
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value_type v = boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.expr);
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#if defined(BOOST_REGEX_HAS_ICU)
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return boost::u32regex_match(v.to_unicode(),x.pattern);
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#else
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return boost::regex_match(v.to_string(),x.pattern);
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#endif
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}
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value_type operator() (regex_replace_node const& x) const
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{
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value_type v = boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.expr);
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#if defined(BOOST_REGEX_HAS_ICU)
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return boost::u32regex_replace(v.to_unicode(),x.pattern,x.format);
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#else
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std::string repl = boost::regex_replace(v.to_string(),x.pattern,x.format);
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mapnik::transcoder tr_("utf8");
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return tr_.transcode(repl.c_str());
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#endif
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}
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feature_type const& feature_;
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};
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}
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#endif // MAPNIK_EXPRESSION_EVALUATOR_HPP
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