leftedgeiterator.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
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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****************************************************************************/
#ifndef LEFTEDGEITERATOR_H
#define LEFTEDGEITERATOR_H
#include "src/ast/expressionnode.h"
#include "src/parser/leftchildextractor.h"
#include <iterator>

namespace jmespath { namespace parser {

class LeftEdgeIterator : public std::iterator<std::forward_iterator_tag,
                                              ast::ExpressionNode>
{
public:
    LeftEdgeIterator()
        : m_node(nullptr)
    {
    }
    LeftEdgeIterator(ast::ExpressionNode& node)
        : m_node(&node)
    {
    }
    reference operator*() const
    {
        return *m_node;
    }
    pointer operator->() const
    {
        return m_node;
    }
    bool operator!=(const LeftEdgeIterator& other) const
    {
        return m_node != other.m_node;
    }
    LeftEdgeIterator& operator++()
    {
        m_node = m_childExtractor(m_node);
        return *this;
    }
    LeftEdgeIterator operator++(int)
    {
        auto tempIterator = *this;
        m_node = m_childExtractor(m_node);
        return tempIterator;
    }

private:
    ast::ExpressionNode* m_node;
    LeftChildExtractor m_childExtractor;
};
}} // namespace jmespath::parser
#endif // LEFTEDGEITERATOR_H