csv_iterator_impl.hpp

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/******************************************************************************
** 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
*/
 
namespace jmmcg { namespace LIBJMMCG_VER_NAMESPACE {
 
inline
csv_iterator::csv_iterator(char delim) noexcept(true)
: delim_(delim) {
}
 
inline
csv_iterator::csv_iterator(std::string const& data, char delim) noexcept(false)
: data_(&data), delim_(delim) {
   read();
}
 
inline csv_iterator::reference
csv_iterator::operator*() const noexcept(true) {
   return field_;
}
 
inline csv_iterator::pointer
csv_iterator::operator->() const noexcept(true) {
   return &field_;
}
 
inline csv_iterator
csv_iterator::operator++() noexcept(false) {
   read();
   return *this;
}
 
inline csv_iterator
csv_iterator::operator++(int) noexcept(false) {
   csv_iterator tmp=*this;
   read();
   return tmp;
}
 
inline bool
csv_iterator::operator==(csv_iterator const& i) const noexcept(true) {
   return (data_==i.data_ && valid_==i.valid_ && pos_==i.pos_)
      || (!valid_ && !i.valid_);
}
 
inline bool
csv_iterator::operator!=(csv_iterator const& i) const noexcept(true) {
   return !(*this==i);
}
 
inline void
csv_iterator::read() noexcept(false) {
   valid_=data_ && (pos_<data_->size());
   if (valid_) {
      const std::size_t last_pos=pos_;
      pos_=data_->find(delim_, last_pos);
      if (pos_==std::string::npos) {
         pos_=data_->size();
      }
      assert(pos_>last_pos);
      field_=data_->substr(last_pos, pos_-last_pos);
      ++pos_;
   }
}
 
} }