csv_iterator.hpp

Go to the documentation of this file.

#ifndef LIBJMMCG_CORE_CSV_ITERATOR_HPP
#define LIBJMMCG_CORE_CSV_ITERATOR_HPP
 
/******************************************************************************
** Copyright © 2020 by J.M.McGuiness, coder@hussar.me.uk & M.Waplington
**
** 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
#include "config.h"
 
#include <istream>
#include <iterator>
#include <string>
 
namespace jmmcg { namespace LIBJMMCG_VER_NAMESPACE {
 
/**
 * Taken from "Generic Programming and the STL" by M.H.Austern.
 */
class csv_iterator {
public:
   using iterator_category=std::input_iterator_tag;
   using value_type=std::string;
   using difference_type=ptrdiff_t;
   using pointer=std::string const *;
   using reference=std::string const&;
 
   explicit csv_iterator(char delim=default_delimiter) noexcept(true);
   explicit csv_iterator(std::string const& data, char delim=default_delimiter) noexcept(false);
 
   reference operator*() const noexcept(true);
   pointer operator->() const noexcept(true);
 
   csv_iterator operator++() noexcept(false);
   [[nodiscard]] csv_iterator operator++(int) noexcept(false);
 
   bool operator==(csv_iterator const& i) const noexcept(true);
   bool operator!=(csv_iterator const& i) const noexcept(true);
 
private:
   static inline constexpr const char default_delimiter=',';
 
   std::string const* data_{nullptr};
   char delim_;
   std::size_t pos_{};
   bool valid_{};
   std::string field_{};
 
   void read() noexcept(false);
};
 
} }
 
#include "csv_iterator_impl.hpp"
 
#endif