507 lines
17 KiB
C++
507 lines
17 KiB
C++
/*****************************************************************************
|
|
*
|
|
* 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 <mapnik/debug.hpp>
|
|
#include <mapnik/geometry.hpp>
|
|
#include <mapnik/geometry_correct.hpp>
|
|
#include <mapnik/wkt/wkt_factory.hpp>
|
|
#include <mapnik/json/geometry_parser.hpp>
|
|
#include <mapnik/util/conversions.hpp>
|
|
#include <mapnik/util/trim.hpp>
|
|
#include <mapnik/datasource.hpp>
|
|
// csv grammar
|
|
#include <mapnik/csv/csv_grammar_impl.hpp>
|
|
//
|
|
#include "csv_getline.hpp"
|
|
#include "csv_utils.hpp"
|
|
|
|
#include <fstream>
|
|
#include <string>
|
|
#include <cstdio>
|
|
#include <algorithm>
|
|
|
|
namespace csv_utils {
|
|
namespace detail {
|
|
|
|
std::size_t file_length(std::istream & stream)
|
|
{
|
|
stream.seekg(0, std::ios::end);
|
|
return stream.tellg();
|
|
}
|
|
|
|
std::tuple<char, bool, char, char> autodetect_csv_flavour(std::istream & stream, std::size_t file_length)
|
|
{
|
|
// autodetect newlines/quotes/separators
|
|
char newline = '\n'; // default
|
|
bool has_newline = false;
|
|
bool has_single_quote = false;
|
|
char quote = '"'; // default
|
|
char separator = ','; // default
|
|
// local counters
|
|
int num_commas = 0;
|
|
int num_tabs = 0;
|
|
int num_pipes = 0;
|
|
int num_semicolons = 0;
|
|
|
|
static std::size_t const max_size = 4000;
|
|
std::size_t size = std::min(file_length, max_size);
|
|
std::vector<char> buffer;
|
|
buffer.resize(size);
|
|
stream.read(buffer.data(), size);
|
|
for (auto c : buffer)
|
|
{
|
|
switch (c)
|
|
{
|
|
case '\r':
|
|
newline = '\r';
|
|
has_newline = true;
|
|
break;
|
|
case '\n':
|
|
has_newline = true;
|
|
break;
|
|
case '\'':
|
|
if (!has_single_quote)
|
|
{
|
|
quote = c;
|
|
has_single_quote = true;
|
|
}
|
|
break;
|
|
case ',':
|
|
if (!has_newline) ++num_commas;
|
|
break;
|
|
case '\t':
|
|
if (!has_newline) ++num_tabs;
|
|
break;
|
|
case '|':
|
|
if (!has_newline) ++num_pipes;
|
|
break;
|
|
case ';':
|
|
if (!has_newline) ++num_semicolons;
|
|
break;
|
|
}
|
|
}
|
|
// detect separator
|
|
if (num_tabs > 0 && num_tabs > num_commas)
|
|
{
|
|
separator = '\t';
|
|
MAPNIK_LOG_DEBUG(csv) << "csv_datasource: auto detected tab separator";
|
|
}
|
|
else // pipes/semicolons
|
|
{
|
|
if (num_pipes > num_commas)
|
|
{
|
|
separator = '|';
|
|
MAPNIK_LOG_DEBUG(csv) << "csv_datasource: auto detected '|' separator";
|
|
}
|
|
else if (num_semicolons > num_commas)
|
|
{
|
|
separator = ';';
|
|
MAPNIK_LOG_DEBUG(csv) << "csv_datasource: auto detected ';' separator";
|
|
}
|
|
}
|
|
|
|
if (has_newline && has_single_quote)
|
|
{
|
|
std::istringstream ss(std::string(buffer.begin(), buffer.end()));
|
|
std::size_t num_columns = 0;
|
|
for (std::string line; csv_utils::getline_csv(ss, line, newline, quote); )
|
|
{
|
|
if (size < file_length && ss.eof())
|
|
{
|
|
// we can't be sure that last line
|
|
// is not truncated so skip it
|
|
break;
|
|
}
|
|
if (line.size() == 0 || (line.size() == 1 && line[0] == char(0xa))) continue; // empty lines are not interesting
|
|
auto num_quotes = std::count(line.begin(), line.end(), quote);
|
|
if (num_quotes % 2 != 0)
|
|
{
|
|
quote = '"';
|
|
break;
|
|
}
|
|
auto columns = csv_utils::parse_line(line, separator, quote);
|
|
if (num_columns > 0 && num_columns != columns.size())
|
|
{
|
|
quote = '"';
|
|
break;
|
|
}
|
|
num_columns = columns.size();
|
|
}
|
|
}
|
|
return std::make_tuple(newline, has_newline, separator, quote);
|
|
}
|
|
|
|
void locate_geometry_column(std::string const& header, std::size_t index, geometry_column_locator & locator)
|
|
{
|
|
std::string lower_val(header);
|
|
std::transform(lower_val.begin(), lower_val.end(), lower_val.begin(), ::tolower);
|
|
if (lower_val == "wkt" || (lower_val.find("geom") != std::string::npos))
|
|
{
|
|
locator.type = geometry_column_locator::WKT;
|
|
locator.index = index;
|
|
}
|
|
else if (lower_val == "geojson")
|
|
{
|
|
locator.type = geometry_column_locator::GEOJSON;
|
|
locator.index = index;
|
|
}
|
|
else if (lower_val == "x" || lower_val == "lon"
|
|
|| lower_val == "lng" || lower_val == "long"
|
|
|| (lower_val.find("longitude") != std::string::npos))
|
|
{
|
|
locator.index = index;
|
|
locator.type = geometry_column_locator::LON_LAT;
|
|
}
|
|
|
|
else if (lower_val == "y"
|
|
|| lower_val == "lat"
|
|
|| (lower_val.find("latitude") != std::string::npos))
|
|
{
|
|
locator.index2 = index;
|
|
locator.type = geometry_column_locator::LON_LAT;
|
|
}
|
|
}
|
|
|
|
bool valid(geometry_column_locator const& locator, std::size_t max_size)
|
|
{
|
|
if (locator.type == geometry_column_locator::UNKNOWN) return false;
|
|
if (locator.index >= max_size) return false;
|
|
if (locator.type == geometry_column_locator::LON_LAT && locator.index2 >= max_size) return false;
|
|
return true;
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
static const mapnik::csv_line_grammar<char const*> line_g;
|
|
static const mapnik::csv_white_space_skipper skipper{};
|
|
|
|
mapnik::csv_line parse_line(char const* start, char const* end, char separator, char quote, std::size_t num_columns)
|
|
{
|
|
mapnik::csv_line values;
|
|
if (num_columns > 0) values.reserve(num_columns);
|
|
if (!boost::spirit::qi::phrase_parse(start, end, (line_g)(separator, quote), skipper, values))
|
|
{
|
|
throw mapnik::datasource_exception("Failed to parse CSV line:\n" + std::string(start, end));
|
|
}
|
|
return values;
|
|
}
|
|
|
|
mapnik::csv_line parse_line(std::string const& line_str, char separator, char quote)
|
|
{
|
|
auto start = line_str.c_str();
|
|
auto end = start + line_str.length();
|
|
return parse_line(start, end, separator, quote, 0);
|
|
}
|
|
|
|
|
|
bool is_likely_number(std::string const& value)
|
|
{
|
|
return (std::strspn( value.c_str(), "e-.+0123456789" ) == value.size());
|
|
}
|
|
|
|
struct ignore_case_equal_pred
|
|
{
|
|
bool operator () (unsigned char a, unsigned char b) const
|
|
{
|
|
return std::tolower(a) == std::tolower(b);
|
|
}
|
|
};
|
|
|
|
bool ignore_case_equal(std::string const& s0, std::string const& s1)
|
|
{
|
|
return std::equal(s0.begin(), s0.end(),
|
|
s1.begin(), ignore_case_equal_pred());
|
|
}
|
|
|
|
void csv_file_parser::add_feature(mapnik::value_integer, mapnik::csv_line const & )
|
|
{
|
|
// no-op by default
|
|
}
|
|
|
|
template <typename T>
|
|
void csv_file_parser::parse_csv_and_boxes(std::istream & csv_file, T & boxes)
|
|
{
|
|
using boxes_type = T;
|
|
using box_type = typename boxes_type::value_type::first_type;
|
|
|
|
auto file_length = detail::file_length(csv_file);
|
|
// set back to start
|
|
csv_file.seekg(0, std::ios::beg);
|
|
char newline;
|
|
bool has_newline;
|
|
char detected_quote;
|
|
char detected_separator;
|
|
std::tie(newline, has_newline, detected_separator, detected_quote) = detail::autodetect_csv_flavour(csv_file, file_length);
|
|
if (quote_ == 0) quote_ = detected_quote;
|
|
if (separator_ == 0) separator_ = detected_separator;
|
|
|
|
// set back to start
|
|
MAPNIK_LOG_DEBUG(csv) << "csv_datasource: separator: '" << separator_
|
|
<< "' quote: '" << quote_ << "'";
|
|
|
|
// rewind stream
|
|
csv_file.seekg(0, std::ios::beg);
|
|
//
|
|
std::string csv_line;
|
|
csv_utils::getline_csv(csv_file, csv_line, newline, quote_);
|
|
csv_file.seekg(0, std::ios::beg);
|
|
int line_number = 0;
|
|
if (!manual_headers_.empty())
|
|
{
|
|
std::size_t index = 0;
|
|
auto headers = csv_utils::parse_line(manual_headers_, separator_, quote_);
|
|
headers_.reserve(headers.size());
|
|
for (auto const& header : headers)
|
|
{
|
|
detail::locate_geometry_column(header, index++, locator_);
|
|
headers_.push_back(header);
|
|
}
|
|
}
|
|
else // parse first line as headers
|
|
{
|
|
while (csv_utils::getline_csv(csv_file, csv_line, newline, quote_))
|
|
{
|
|
try
|
|
{
|
|
auto headers = csv_utils::parse_line(csv_line, separator_, quote_);
|
|
// skip blank lines
|
|
if (headers.size() > 0 && headers[0].empty()) ++line_number;
|
|
else
|
|
{
|
|
std::size_t index = 0;
|
|
headers_.reserve(headers.size());
|
|
for (auto & header : headers)
|
|
{
|
|
mapnik::util::trim(header);
|
|
if (header.empty())
|
|
{
|
|
if (strict_)
|
|
{
|
|
std::ostringstream s;
|
|
s << "CSV Plugin: expected a column header at line ";
|
|
s << line_number << ", column " << index;
|
|
s << " - ensure this row contains valid header fields: '";
|
|
s << csv_line;
|
|
throw mapnik::datasource_exception(s.str());
|
|
}
|
|
else
|
|
{
|
|
// create a placeholder for the empty header
|
|
std::ostringstream s;
|
|
s << "_" << index;
|
|
headers_.push_back(s.str());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
detail::locate_geometry_column(header, index, locator_);
|
|
headers_.push_back(header);
|
|
}
|
|
++index;
|
|
}
|
|
++line_number;
|
|
break;
|
|
}
|
|
}
|
|
catch (std::exception const& ex)
|
|
{
|
|
std::string s("CSV Plugin: error parsing headers: ");
|
|
s += ex.what();
|
|
throw mapnik::datasource_exception(s);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::size_t num_headers = headers_.size();
|
|
if (!detail::valid(locator_, num_headers))
|
|
{
|
|
std::string str("CSV Plugin: could not detect column(s) with the name(s) of wkt, geojson, x/y, or ");
|
|
str += "latitude/longitude in:\n";
|
|
str += csv_line;
|
|
str += "\n - this is required for reading geometry data";
|
|
throw mapnik::datasource_exception(str);
|
|
}
|
|
|
|
mapnik::value_integer feature_count = 0;
|
|
auto pos = csv_file.tellg();
|
|
// handle rare case of a single line of data and user-provided headers
|
|
// where a lack of a newline will mean that csv_utils::getline_csv returns false
|
|
bool is_first_row = false;
|
|
|
|
if (!has_newline)
|
|
{
|
|
csv_file.setstate(std::ios::failbit);
|
|
pos = 0;
|
|
if (!csv_line.empty())
|
|
{
|
|
is_first_row = true;
|
|
}
|
|
}
|
|
|
|
while (is_first_row || csv_utils::getline_csv(csv_file, csv_line, newline, quote_))
|
|
{
|
|
++line_number;
|
|
if ((row_limit_ > 0) && (line_number > row_limit_))
|
|
{
|
|
MAPNIK_LOG_DEBUG(csv) << "csv_datasource: row limit hit, exiting at feature: " << feature_count;
|
|
break;
|
|
}
|
|
auto record_offset = pos;
|
|
auto record_size = csv_line.length();
|
|
pos = csv_file.tellg();
|
|
is_first_row = false;
|
|
|
|
// skip blank lines
|
|
if (record_size <= 10)
|
|
{
|
|
std::string trimmed = csv_line;
|
|
boost::trim_if(trimmed, boost::algorithm::is_any_of("\",'\r\n "));
|
|
if (trimmed.empty())
|
|
{
|
|
MAPNIK_LOG_DEBUG(csv) << "csv_datasource: empty row encountered at line: " << line_number;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
try
|
|
{
|
|
auto const* line_start = csv_line.data();
|
|
auto const* line_end = line_start + csv_line.size();
|
|
auto values = csv_utils::parse_line(line_start, line_end, separator_, quote_, num_headers);
|
|
unsigned num_fields = values.size();
|
|
if (num_fields != num_headers)
|
|
{
|
|
std::ostringstream s;
|
|
s << "CSV Plugin: # of columns(" << num_fields << ")";
|
|
if (num_fields > num_headers)
|
|
{
|
|
s << " > ";
|
|
}
|
|
else
|
|
{
|
|
s << " < ";
|
|
}
|
|
s << "# of headers(" << num_headers << ") parsed";
|
|
throw mapnik::datasource_exception(s.str());
|
|
}
|
|
|
|
auto geom = extract_geometry(values, locator_);
|
|
if (!geom.is<mapnik::geometry::geometry_empty<double>>())
|
|
{
|
|
auto box = mapnik::geometry::envelope(geom);
|
|
if (!extent_initialized_)
|
|
{
|
|
if (extent_.valid())
|
|
extent_.expand_to_include(box);
|
|
else
|
|
extent_ = box;
|
|
}
|
|
boxes.emplace_back(box_type(box), make_pair(record_offset, record_size));
|
|
add_feature(++feature_count, values);
|
|
}
|
|
else
|
|
{
|
|
std::ostringstream s;
|
|
s << "CSV Plugin: expected geometry column: could not parse row "
|
|
<< line_number << " "
|
|
<< values.at(locator_.index) << "'";
|
|
throw mapnik::datasource_exception(s.str());
|
|
}
|
|
}
|
|
catch (mapnik::datasource_exception const& ex )
|
|
{
|
|
if (strict_) throw ex;
|
|
else
|
|
{
|
|
MAPNIK_LOG_ERROR(csv) << ex.what() << " at line: " << line_number;
|
|
}
|
|
}
|
|
catch (std::exception const& ex)
|
|
{
|
|
std::ostringstream s;
|
|
s << "CSV Plugin: unexpected error parsing line: " << line_number
|
|
<< " - found " << headers_.size() << " with values like: " << csv_line << "\n"
|
|
<< " and got error like: " << ex.what();
|
|
if (strict_)
|
|
{
|
|
throw mapnik::datasource_exception(s.str());
|
|
}
|
|
else
|
|
{
|
|
MAPNIK_LOG_ERROR(csv) << s.str();
|
|
}
|
|
}
|
|
// return early if *.index is present
|
|
if (has_disk_index_) return;
|
|
}
|
|
}
|
|
|
|
|
|
mapnik::geometry::geometry<double> extract_geometry(std::vector<std::string> const& row, geometry_column_locator const& locator)
|
|
{
|
|
mapnik::geometry::geometry<double> geom;
|
|
if (locator.type == geometry_column_locator::WKT)
|
|
{
|
|
auto wkt_value = row.at(locator.index);
|
|
if (mapnik::from_wkt(wkt_value, geom))
|
|
{
|
|
// correct orientations ..
|
|
mapnik::geometry::correct(geom);
|
|
}
|
|
else
|
|
{
|
|
throw mapnik::datasource_exception("Failed to parse WKT: '" + wkt_value + "'");
|
|
}
|
|
}
|
|
else if (locator.type == geometry_column_locator::GEOJSON)
|
|
{
|
|
|
|
auto json_value = row.at(locator.index);
|
|
if (!mapnik::json::from_geojson(json_value, geom))
|
|
{
|
|
throw mapnik::datasource_exception("Failed to parse GeoJSON: '" + json_value + "'");
|
|
}
|
|
}
|
|
else if (locator.type == geometry_column_locator::LON_LAT)
|
|
{
|
|
double x, y;
|
|
auto long_value = row.at(locator.index);
|
|
auto lat_value = row.at(locator.index2);
|
|
if (!mapnik::util::string2double(long_value,x))
|
|
{
|
|
throw mapnik::datasource_exception("Failed to parse Longitude: '" + long_value + "'");
|
|
}
|
|
if (!mapnik::util::string2double(lat_value,y))
|
|
{
|
|
throw mapnik::datasource_exception("Failed to parse Latitude: '" + lat_value + "'");
|
|
}
|
|
geom = mapnik::geometry::point<double>(x,y);
|
|
}
|
|
return geom;
|
|
}
|
|
|
|
template void csv_file_parser::parse_csv_and_boxes(std::istream & csv_file, std::vector<std::pair<mapnik::box2d<double>, std::pair<std::size_t, std::size_t>>> & boxes);
|
|
|
|
template void csv_file_parser::parse_csv_and_boxes(std::istream & csv_file, std::vector<std::pair<mapnik::box2d<float>, std::pair<std::size_t, std::size_t>>> & boxes);
|
|
|
|
} // namespace csv_utils
|