nodeinsertcondition.h

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/****************************************************************************
**
** Author: Róbert Márki <gsmiko@gmail.com>
** Copyright (c) 2016 Róbert Márki
**
** This file is part of the jmespath.cpp project which is distributed under
** the MIT License (MIT).
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to
** deal in the Software without restriction, including without limitation the
** rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
** sell copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#ifndef NODEINSERTCONDITION_H
#define NODEINSERTCONDITION_H
#include "src/ast/allnodes.h"
#include "src/parser/noderank.h"
#include <boost/variant/polymorphic_get.hpp>

namespace jmespath { namespace parser {

class NodeInsertCondition
{
public:
    using result_type = bool;

    template <typename T, typename
        std::enable_if<
            std::is_base_of<ast::BinaryExpressionNode,
                            T>::value, int>::type = 0>
    bool operator()(const ast::ExpressionNode& targetNode,
                    const T& node) const
    {
        int targetNodeRank = nodeRank(targetNode);
        int currentNodeRank = nodeRank(node);
        const ast::BinaryExpressionNode* targetBinaryNode
                = boost::polymorphic_get<ast::BinaryExpressionNode>(
                    &targetNode.value);
        return (targetNodeRank < currentNodeRank)
                || ((targetNodeRank == currentNodeRank)
                    && targetBinaryNode
                    && targetBinaryNode->isProjection()
                    && !targetBinaryNode->stopsProjection());
    }

    template <typename T, typename
        std::enable_if<
            !std::is_base_of<ast::BinaryExpressionNode,
                             T>::value, int>::type = 0>
    bool operator()(const ast::ExpressionNode& targetNode,
                    const T& node) const
    {
        int targetNodeRank = nodeRank(targetNode);
        int currentNodeRank = nodeRank(node);
        return (targetNodeRank < currentNodeRank);
    }
};
}} // namespace jmespath::parser
#endif // NODEINSERTCONDITION_H