287 lines
9 KiB
C++
287 lines
9 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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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/geometry.hpp>
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#include <mapnik/geometry_correct.hpp>
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#include <mapnik/wkt/wkt_factory.hpp>
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#include <mapnik/json/geometry_parser.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/csv/csv_grammar.hpp>
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#include <mapnik/util/trim.hpp>
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#include <mapnik/datasource.hpp>
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#include "csv_getline.hpp"
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#include "csv_utils.hpp"
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/interprocess/streams/bufferstream.hpp>
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#pragma GCC diagnostic pop
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#endif
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#include <fstream>
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#include <string>
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#include <cstdio>
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#include <algorithm>
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namespace csv_utils
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{
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static const mapnik::csv_line_grammar<char const*> line_g;
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static const mapnik::csv_white_space_skipper skipper{};
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mapnik::csv_line parse_line(char const* start, char const* end, char separator, char quote, std::size_t num_columns)
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{
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mapnik::csv_line values;
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if (num_columns > 0) values.reserve(num_columns);
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if (!boost::spirit::qi::phrase_parse(start, end, (line_g)(separator, quote), skipper, values))
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{
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throw mapnik::datasource_exception("Failed to parse CSV line:\n" + std::string(start, end));
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}
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return values;
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}
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mapnik::csv_line parse_line(std::string const& line_str, char separator, char quote)
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{
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auto start = line_str.c_str();
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auto end = start + line_str.length();
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return parse_line(start, end, separator, quote, 0);
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}
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bool is_likely_number(std::string const& value)
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{
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return (std::strspn( value.c_str(), "e-.+0123456789" ) == value.size());
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}
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struct ignore_case_equal_pred
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{
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bool operator () (unsigned char a, unsigned char b) const
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{
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return std::tolower(a) == std::tolower(b);
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}
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};
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bool ignore_case_equal(std::string const& s0, std::string const& s1)
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{
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return std::equal(s0.begin(), s0.end(),
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s1.begin(), ignore_case_equal_pred());
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}
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}
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namespace detail {
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template <typename T>
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std::tuple<char, bool, char, char> autodect_csv_flavour(T & stream, std::size_t file_length)
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{
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// autodetect newlines/quotes/separators
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char newline = '\n'; // default
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bool has_newline = false;
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bool has_single_quote = false;
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char quote = '"'; // default
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char separator = ','; // default
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// local counters
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int num_commas = 0;
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int num_tabs = 0;
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int num_pipes = 0;
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int num_semicolons = 0;
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static std::size_t const max_size = 4000;
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std::size_t size = std::min(file_length, max_size);
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std::vector<char> buffer;
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buffer.resize(size);
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stream.read(buffer.data(), size);
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for (auto c : buffer)
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{
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switch (c)
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{
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case '\r':
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newline = '\r';
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has_newline = true;
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break;
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case '\n':
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has_newline = true;
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break;
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case '\'':
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if (!has_single_quote)
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{
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quote = c;
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has_single_quote = true;
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}
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break;
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case ',':
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if (!has_newline) ++num_commas;
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break;
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case '\t':
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if (!has_newline) ++num_tabs;
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break;
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case '|':
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if (!has_newline) ++num_pipes;
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break;
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case ';':
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if (!has_newline) ++num_semicolons;
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break;
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}
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}
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// detect separator
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if (num_tabs > 0 && num_tabs > num_commas)
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{
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separator = '\t';
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MAPNIK_LOG_DEBUG(csv) << "csv_datasource: auto detected tab separator";
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}
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else // pipes/semicolons
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{
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if (num_pipes > num_commas)
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{
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separator = '|';
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MAPNIK_LOG_DEBUG(csv) << "csv_datasource: auto detected '|' separator";
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}
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else if (num_semicolons > num_commas)
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{
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separator = ';';
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MAPNIK_LOG_DEBUG(csv) << "csv_datasource: auto detected ';' separator";
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}
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}
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if (has_newline && has_single_quote)
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{
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std::istringstream ss(std::string(buffer.begin(), buffer.end()));
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std::size_t num_columns = 0;
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for (std::string line; csv_utils::getline_csv(ss, line, newline, quote); )
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{
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if (size < file_length && ss.eof())
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{
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// we can't be sure last line
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// is not truncated so skip it
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break;
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}
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if (line.size() == 0) continue; // empty lines are not interesting
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auto num_quotes = std::count(line.begin(), line.end(), quote);
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if (num_quotes % 2 != 0)
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{
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quote = '"';
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break;
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}
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auto columns = csv_utils::parse_line(line, separator, quote);
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if (num_columns > 0 && num_columns != columns.size())
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{
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quote = '"';
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break;
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}
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num_columns = columns.size();
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}
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}
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return std::make_tuple(newline, has_newline, separator, quote);
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}
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template std::tuple<char, bool, char, char> autodect_csv_flavour(std::istringstream & stream, std::size_t file_length);
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template std::tuple<char, bool, char, char> autodect_csv_flavour(std::ifstream & stream, std::size_t file_length);
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template std::tuple<char, bool, char, char> autodect_csv_flavour(boost::interprocess::ibufferstream & stream, std::size_t file_length);
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void locate_geometry_column(std::string const& header, std::size_t index, geometry_column_locator & locator)
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{
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std::string lower_val(header);
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std::transform(lower_val.begin(), lower_val.end(), lower_val.begin(), ::tolower);
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if (lower_val == "wkt" || (lower_val.find("geom") != std::string::npos))
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{
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locator.type = geometry_column_locator::WKT;
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locator.index = index;
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}
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else if (lower_val == "geojson")
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{
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locator.type = geometry_column_locator::GEOJSON;
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locator.index = index;
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}
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else if (lower_val == "x" || lower_val == "lon"
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|| lower_val == "lng" || lower_val == "long"
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|| (lower_val.find("longitude") != std::string::npos))
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{
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locator.index = index;
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locator.type = geometry_column_locator::LON_LAT;
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}
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else if (lower_val == "y"
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|| lower_val == "lat"
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|| (lower_val.find("latitude") != std::string::npos))
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{
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locator.index2 = index;
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locator.type = geometry_column_locator::LON_LAT;
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}
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}
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bool valid(geometry_column_locator const& locator, std::size_t max_size)
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{
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if (locator.type == geometry_column_locator::UNKNOWN) return false;
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if (locator.index >= max_size) return false;
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if (locator.type == geometry_column_locator::LON_LAT && locator.index2 >= max_size) return false;
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return true;
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}
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mapnik::geometry::geometry<double> extract_geometry(std::vector<std::string> const& row, geometry_column_locator const& locator)
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{
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mapnik::geometry::geometry<double> geom;
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if (locator.type == geometry_column_locator::WKT)
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{
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auto wkt_value = row.at(locator.index);
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if (mapnik::from_wkt(wkt_value, geom))
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{
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// correct orientations ..
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mapnik::geometry::correct(geom);
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}
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else
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{
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throw mapnik::datasource_exception("Failed to parse WKT: '" + wkt_value + "'");
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}
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}
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else if (locator.type == geometry_column_locator::GEOJSON)
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{
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auto json_value = row.at(locator.index);
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if (!mapnik::json::from_geojson(json_value, geom))
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{
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throw mapnik::datasource_exception("Failed to parse GeoJSON: '" + json_value + "'");
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}
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}
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else if (locator.type == geometry_column_locator::LON_LAT)
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{
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double x, y;
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auto long_value = row.at(locator.index);
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auto lat_value = row.at(locator.index2);
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if (!mapnik::util::string2double(long_value,x))
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{
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throw mapnik::datasource_exception("Failed to parse Longitude: '" + long_value + "'");
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}
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if (!mapnik::util::string2double(lat_value,y))
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{
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throw mapnik::datasource_exception("Failed to parse Latitude: '" + lat_value + "'");
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}
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geom = mapnik::geometry::point<double>(x,y);
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}
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return geom;
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}
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}// ns detail
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