mapnik/include/mapnik/expression_node.hpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2015 Artem Pavlenko
 *
 * 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
 *
 *****************************************************************************/

#ifndef MAPNIK_EXPRESSION_NODE_HPP
#define MAPNIK_EXPRESSION_NODE_HPP

// mapnik
#include <mapnik/value_types.hpp>
#include <mapnik/value.hpp>
#include <mapnik/config.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/attribute.hpp>
#include <mapnik/function_call.hpp>
#include <mapnik/expression_node_types.hpp>

namespace mapnik
{

using value_type = mapnik::value;

template <typename Tag> struct make_op;
template <> struct make_op<mapnik::tags::negate> { using type = std::negate<value_type>;};
template <> struct make_op<mapnik::tags::plus> { using type = std::plus<value_type>;};
template <> struct make_op<mapnik::tags::minus> { using type = std::minus<value_type>;};
template <> struct make_op<mapnik::tags::mult> { using type = std::multiplies<value_type>;};
template <> struct make_op<mapnik::tags::div> { using type = std::divides<value_type>;};
template <> struct make_op<mapnik::tags::mod> { using type =  std::modulus<value_type>;};
template <> struct make_op<mapnik::tags::less> { using type = std::less<value_type>;};
template <> struct make_op<mapnik::tags::less_equal> { using type = std::less_equal<value_type>;};
template <> struct make_op<mapnik::tags::greater> { using type = std::greater<value_type>;};
template <> struct make_op<mapnik::tags::greater_equal> { using type = std::greater_equal<value_type>;};
template <> struct make_op<mapnik::tags::equal_to> { using type = std::equal_to<value_type>;};
template <> struct make_op<mapnik::tags::not_equal_to> { using type = std::not_equal_to<value_type>;};
template <> struct make_op<mapnik::tags::logical_not> { using type = std::logical_not<value_type>;};
template <> struct make_op<mapnik::tags::logical_and> { using type = std::logical_and<value_type>;};
template <> struct make_op<mapnik::tags::logical_or> { using type =  std::logical_or<value_type>;};

template <typename Tag>
struct unary_node
{
    unary_node (expr_node && a)
        : expr(std::move(a)) {}

    unary_node (expr_node const a)
        : expr(a) {}

    static const char* type()
    {
        return Tag::str();
    }

    expr_node expr;
};

template <typename Tag>
struct binary_node
{
    binary_node(expr_node && a, expr_node && b)
        : left(std::move(a)),
          right(std::move(b)) {}

    binary_node(expr_node const& a, expr_node const& b)
        : left(a),
          right(b) {}

    static const char* type()
    {
        return Tag::str();
    }
    expr_node left,right;
};

struct unary_function_call
{
    using argument_type = expr_node;
    unary_function_call() = default;
    unary_function_call(unary_function_impl _fun, argument_type const& _arg)
        : fun(_fun), arg(_arg) {}

    unary_function_impl fun;
    argument_type arg;
};

struct binary_function_call
{
    using argument_type = expr_node;
    binary_function_call() = default;
    binary_function_call(binary_function_impl _fun, argument_type const& _arg1, argument_type const& _arg2)
        : fun(_fun), arg1(_arg1), arg2(_arg2) {}
    binary_function_impl fun;
    argument_type arg1;
    argument_type arg2;
};

// pimpl
struct _regex_match_impl;
struct _regex_replace_impl;

struct MAPNIK_DECL regex_match_node
{
    regex_match_node(transcoder const& tr, expr_node const& a, std::string const& ustr);
    mapnik::value apply(mapnik::value const& v) const;
    std::string to_string() const;
    expr_node expr;
    // TODO - use unique_ptr once https://github.com/mapnik/mapnik/issues/2457 is fixed
    std::shared_ptr<_regex_match_impl> impl_;
};

struct MAPNIK_DECL regex_replace_node
{
    regex_replace_node(transcoder const& tr, expr_node const& a, std::string const& ustr, std::string const& f);
    mapnik::value apply(mapnik::value const& v) const;
    std::string to_string() const;
    expr_node expr;
    // TODO - use unique_ptr once https://github.com/mapnik/mapnik/issues/2457 is fixed
    std::shared_ptr<_regex_replace_impl> impl_;
};

}


#endif //MAPNIK_EXPRESSION_NODE_HPP