125 lines
3.5 KiB
C++
125 lines
3.5 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) 2024 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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// mapnik
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#include <mapnik/config.hpp> // needed by msvc
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#include <mapnik/expression_string.hpp> // needed by msvc
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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/attribute.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/value.hpp>
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namespace mapnik {
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struct expression_string
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{
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explicit expression_string(std::string& str)
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: str_(str)
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{}
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void operator()(value_type const& x) const { str_ += x.to_expression_string(); }
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void operator()(attribute const& attr) const
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{
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str_ += "[";
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str_ += attr.name();
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str_ += "]";
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}
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void operator()(global_attribute const& attr) const
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{
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str_ += "@";
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str_ += attr.name;
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}
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void operator()(geometry_type_attribute const& /*attr*/) const { str_ += "[mapnik::geometry_type]"; }
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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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if (x.type() != tags::mult::str() && x.type() != tags::div::str())
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{
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str_ += "(";
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}
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util::apply_visitor(*this, x.left);
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str_ += x.type();
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util::apply_visitor(*this, x.right);
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if (x.type() != tags::mult::str() && x.type() != tags::div::str())
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{
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str_ += ")";
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}
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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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str_ += Tag::str();
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str_ += "(";
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util::apply_visitor(*this, x.expr);
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str_ += ")";
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}
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void operator()(regex_match_node const& x) const
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{
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util::apply_visitor(*this, x.expr);
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str_ += x.to_string();
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}
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void operator()(regex_replace_node const& x) const
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{
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util::apply_visitor(*this, x.expr);
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str_ += x.to_string();
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}
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void operator()(unary_function_call const& call) const
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{
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str_ += unary_function_name(call.fun);
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str_ += "(";
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util::apply_visitor(*this, call.arg);
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str_ += ")";
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}
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void operator()(binary_function_call const& call) const
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{
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str_ += binary_function_name(call.fun);
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str_ += "(";
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util::apply_visitor(*this, call.arg1);
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str_ += ",";
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util::apply_visitor(*this, call.arg2);
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str_ += ")";
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}
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private:
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std::string& str_;
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};
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std::string to_expression_string(expr_node const& node)
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{
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std::string str;
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expression_string functor(str);
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util::apply_visitor(std::ref(functor), node);
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return str;
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}
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} // namespace mapnik
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