text: /*****************************************************************************
   *
   * This file is part of Mapnik (c++ mapping toolkit)
   *
   * Copyright (C) 2015 Artem Pavlenko
   *
   * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   *
   *****************************************************************************/
  
  // mapnik
  #include "csv_inline_featureset.hpp"
  #include <mapnik/debug.hpp>
  #include <mapnik/feature.hpp>
  #include <mapnik/feature_factory.hpp>
  #include <mapnik/util/utf_conv_win.hpp>
  #include <mapnik/util/trim.hpp>
  // stl
  #include <string>
  #include <vector>
  #include <deque>
  
  csv_inline_featureset::csv_inline_featureset(std::string const& inline_string,
                                               locator_type const& locator,
                                               char separator,
                                               char quote,
                                               std::vector<std::string> const& headers,
                                               mapnik::context_ptr const& ctx,
                                               array_type && index_array)
      : inline_string_(inline_string),
        separator_(separator),
        quote_(quote),
        headers_(headers),
        index_array_(std::move(index_array)),
        index_itr_(index_array_.begin()),
        index_end_(index_array_.end()),
        ctx_(ctx),
        locator_(locator),
        tr_("utf8") {}
  
  csv_inline_featureset::~csv_inline_featureset() {}
  
  mapnik::feature_ptr csv_inline_featureset::parse_feature(std::string const& str)
  {
      auto const* start = str.data();
      auto const* end = start + str.size();
      auto values = csv_utils::parse_line(start, end, separator_, quote_, headers_.size());
      auto geom = csv_utils::extract_geometry(values, locator_);
      if (!geom.is<mapnik::geometry::geometry_empty>())
      {
          mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx_, ++feature_id_));
          feature->set_geometry(std::move(geom));
          csv_utils::process_properties(*feature, headers_, values, locator_, tr_);
          return feature;
      }
      return mapnik::feature_ptr();
  }
  
  mapnik::feature_ptr csv_inline_featureset::next()
  {
      if (index_itr_ != index_end_)
      {
          csv_datasource::item_type const& item = *index_itr_++;
          std::size_t file_offset = item.second.first;
          std::size_t size = item.second.second;
          std::string str = inline_string_.substr(file_offset, size);
          return parse_feature(str);
      }
      return mapnik::feature_ptr();
  }
  