215 lines
8.1 KiB
C++
215 lines
8.1 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2015 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#include "process_csv_file.hpp"
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#include "../../plugins/input/csv/csv_utils.hpp"
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#include <mapnik/geometry_envelope.hpp>
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wshadow"
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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#include <boost/interprocess/mapped_region.hpp>
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#include <boost/interprocess/streams/bufferstream.hpp>
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#pragma GCC diagnostic pop
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#include <mapnik/mapped_memory_cache.hpp>
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namespace mapnik { namespace detail {
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template <typename T>
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std::pair<bool,box2d<double>> process_csv_file(T & boxes, std::string const& filename, std::string const& manual_headers, char separator, char quote)
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{
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using file_source_type = boost::interprocess::ibufferstream;
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file_source_type csv_file;
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mapnik::box2d<double> extent;
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mapnik::mapped_region_ptr mapped_region;
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boost::optional<mapnik::mapped_region_ptr> memory =
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mapnik::mapped_memory_cache::instance().find(filename, true);
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if (memory)
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{
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mapped_region = *memory;
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csv_file.buffer(static_cast<char*>(mapped_region->get_address()),mapped_region->get_size());
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}
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else
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{
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std::clog << "Error : cannot mmap " << filename << std::endl;
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return std::make_pair(false, extent);
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}
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auto file_length = ::detail::file_length(csv_file);
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// set back to start
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csv_file.seekg(0, std::ios::beg);
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char newline;
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bool has_newline;
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char detected_quote;
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std::tie(newline, has_newline, detected_quote) = ::detail::autodect_newline_and_quote(csv_file, file_length);
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if (quote == 0) quote = detected_quote;
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// set back to start
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csv_file.seekg(0, std::ios::beg);
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// get first line
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std::string csv_line;
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csv_utils::getline_csv(csv_file, csv_line, newline, quote);
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if (separator == 0) separator = ::detail::detect_separator(csv_line);
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csv_file.seekg(0, std::ios::beg);
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int line_number = 1;
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::detail::geometry_column_locator locator;
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std::vector<std::string> headers;
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std::clog << "Parsing CSV using SEPARATOR=" << separator << " QUOTE=" << quote << std::endl;
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if (!manual_headers.empty())
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{
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std::size_t index = 0;
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headers = csv_utils::parse_line(manual_headers, separator, quote);
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for (auto const& header : headers)
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{
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::detail::locate_geometry_column(header, index++, locator);
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headers.push_back(header);
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}
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}
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else // parse first line as headers
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{
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while (csv_utils::getline_csv(csv_file,csv_line,newline, quote))
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{
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try
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{
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headers = csv_utils::parse_line(csv_line, separator, quote);
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// skip blank lines
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if (headers.size() > 0 && headers[0].empty()) ++line_number;
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else
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{
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std::size_t index = 0;
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for (auto & header : headers)
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{
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if (header.empty())
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{
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// create a placeholder for the empty header
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std::ostringstream s;
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s << "_" << index;
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header = s.str();
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}
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else
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{
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::detail::locate_geometry_column(header, index, locator);
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}
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++index;
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}
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++line_number;
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break;
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}
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}
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catch (std::exception const& ex)
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{
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std::string s("CSV index: error parsing headers: ");
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s += ex.what();
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std::clog << s << std::endl;
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return std::make_pair(false, extent);
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}
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}
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}
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if (locator.type == ::detail::geometry_column_locator::UNKNOWN)
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{
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std::clog << "CSV index: could not detect column headers with the name of wkt, geojson, x/y, or "
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<< "latitude/longitude - this is required for reading geometry data" << std::endl;
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return std::make_pair(false, extent);
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}
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std::size_t num_headers = headers.size();
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auto pos = csv_file.tellg();
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// handle rare case of a single line of data and user-provided headers
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// where a lack of a newline will mean that csv_utils::getline_csv returns false
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bool is_first_row = false;
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if (!has_newline)
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{
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csv_file.setstate(std::ios::failbit);
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pos = 0;
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if (!csv_line.empty())
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{
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is_first_row = true;
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}
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}
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while (is_first_row || csv_utils::getline_csv(csv_file, csv_line, newline, quote))
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{
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auto record_offset = pos;
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auto record_size = csv_line.length();
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pos = csv_file.tellg();
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is_first_row = false;
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// skip blank lines
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if (record_size <= 10)
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{
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std::string trimmed = csv_line;
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boost::trim_if(trimmed, boost::algorithm::is_any_of("\",'\r\n "));
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if (trimmed.empty())
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{
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std::clog << "CSV index: empty row encountered at line: " << line_number << std::endl;
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continue;
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}
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}
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try
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{
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auto values = csv_utils::parse_line(csv_line, separator, quote);
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unsigned num_fields = values.size();
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if (num_fields > num_headers || num_fields < num_headers)
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{
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std::ostringstream s;
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s << "CSV Index: # of columns("
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<< num_fields << ") > # of headers("
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<< num_headers << ") parsed for row " << line_number << "\n";
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std::clog << s.str() << std::endl;
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return std::make_pair(false, extent);
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}
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auto geom = ::detail::extract_geometry(values, locator);
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if (!geom.is<mapnik::geometry::geometry_empty>())
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{
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auto box = mapnik::geometry::envelope(geom);
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if (!extent.valid()) extent = box;
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else extent.expand_to_include(box);
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boxes.emplace_back(std::move(box), make_pair(record_offset, record_size));
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}
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else
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{
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std::ostringstream s;
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s << "CSV Index: expected geometry column: could not parse row "
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<< line_number << " "
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<< values[locator.index] << "'";
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std::clog << s.str() << std::endl;;
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}
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}
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catch (std::exception const& ex)
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{
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std::ostringstream s;
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s << "CSV Index: unexpected error parsing line: " << line_number
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<< " - found " << headers.size() << " with values like: " << csv_line << "\n"
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<< " and got error like: " << ex.what();
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std::clog << s.str() << std::endl;
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return std::make_pair(false, extent);
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}
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}
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return std::make_pair(true, extent);;
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}
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using box_type = mapnik::box2d<double>;
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using item_type = std::pair<box_type, std::pair<std::size_t, std::size_t>>;
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using boxes_type = std::vector<item_type>;
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template std::pair<bool,box2d<double>> process_csv_file(boxes_type&, std::string const&, std::string const&, char, char);
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}}
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