expression.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,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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****************************************************************************/
#ifndef EXPRESSION_H
#define EXPRESSION_H
#include <memory>
#include <jmespath/types.h>
#include <jmespath/exceptions.h>

namespace jmespath {

namespace ast {
class ExpressionNode;
}
class Expression
{
public:
    Expression();
    Expression(const Expression& other);
    Expression(Expression&& other);
    template <typename U, typename
        std::enable_if<
            std::is_convertible<U, String>::value>::type* = nullptr>
    Expression(U&& expression)
        : m_expressionString(std::forward<U>(expression))
    {
        parseExpression(m_expressionString);
    }
    Expression& operator= (const Expression& other);
    Expression& operator= (Expression&& other);
    bool operator== (const Expression& other) const;
    String toString() const;
    bool isEmpty() const;
    const ast::ExpressionNode* astRoot() const;

private:
    struct ExpressionDeleter
    {
        void operator()(ast::ExpressionNode* node) const;
    };
    String m_expressionString;
    std::unique_ptr<ast::ExpressionNode, ExpressionDeleter> m_astRoot;
    void parseExpression(const String &expressionString);
};

namespace literals {

inline Expression operator""_jmespath(const char* expression, std::size_t)
{
    return {expression};
}
} // namespace jmespath::literals
} // namespace jmespath
#endif // EXPRESSION_H