587 lines
21 KiB
C++
587 lines
21 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 "csv_utils.hpp"
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#include "csv_datasource.hpp"
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#include "csv_featureset.hpp"
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#include "csv_inline_featureset.hpp"
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// boost
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#include <boost/algorithm/string.hpp>
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/util/utf_conv_win.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/feature_layer_desc.hpp>
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#include <mapnik/feature_factory.hpp>
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#include <mapnik/memory_featureset.hpp>
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#include <mapnik/boolean.hpp>
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#include <mapnik/util/trim.hpp>
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#include <mapnik/util/geometry_to_ds_type.hpp>
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#include <mapnik/value_types.hpp>
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// stl
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#include <sstream>
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#include <fstream>
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#include <vector>
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#include <string>
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#include <algorithm>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(csv_datasource)
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namespace {
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using cvs_value = mapnik::util::variant<std::string, mapnik::value_integer, mapnik::value_double, mapnik::value_bool>;
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}
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csv_datasource::csv_datasource(parameters const& params)
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: datasource(params),
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desc_(csv_datasource::name(), *params.get<std::string>("encoding", "utf-8")),
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extent_(),
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filename_(),
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row_limit_(*params.get<mapnik::value_integer>("row_limit", 0)),
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inline_string_(),
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escape_(*params.get<std::string>("escape", "")),
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separator_(*params.get<std::string>("separator", "")),
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quote_(*params.get<std::string>("quote", "")),
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headers_(),
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manual_headers_(mapnik::util::trim_copy(*params.get<std::string>("headers", ""))),
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strict_(*params.get<mapnik::boolean_type>("strict", false)),
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ctx_(std::make_shared<mapnik::context_type>()),
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extent_initialized_(false),
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tree_(nullptr),
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locator_()
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{
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boost::optional<std::string> ext = params.get<std::string>("extent");
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if (ext && !ext->empty())
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{
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extent_initialized_ = extent_.from_string(*ext);
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}
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boost::optional<std::string> inline_string = params.get<std::string>("inline");
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if (inline_string)
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{
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inline_string_ = *inline_string;
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}
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else
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{
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boost::optional<std::string> file = params.get<std::string>("file");
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if (!file) throw mapnik::datasource_exception("CSV Plugin: missing <file> parameter");
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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filename_ = *base + "/" + *file;
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else
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filename_ = *file;
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}
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if (!inline_string_.empty())
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{
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std::istringstream in(inline_string_);
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parse_csv(in, escape_, separator_, quote_);
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}
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else
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{
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#if defined (_WINDOWS)
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std::ifstream in(mapnik::utf8_to_utf16(filename_),std::ios_base::in | std::ios_base::binary);
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#else
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std::ifstream in(filename_.c_str(),std::ios_base::in | std::ios_base::binary);
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#endif
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if (!in.is_open())
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{
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throw mapnik::datasource_exception("CSV Plugin: could not open: '" + filename_ + "'");
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}
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parse_csv(in, escape_, separator_, quote_);
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in.close();
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}
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}
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csv_datasource::~csv_datasource() {}
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template <typename T>
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void csv_datasource::parse_csv(T & stream,
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std::string const& escape,
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std::string const& separator,
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std::string const& quote)
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{
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auto file_length = detail::file_length(stream);
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// set back to start
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stream.seekg(0, std::ios::beg);
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char newline;
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bool has_newline;
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std::tie(newline, has_newline) = detail::autodect_newline(stream, file_length);
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// set back to start
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stream.seekg(0, std::ios::beg);
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// get first line
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std::string csv_line;
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std::getline(stream,csv_line,stream.widen(newline));
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// if user has not passed a separator manually
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// then attempt to detect by reading first line
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std::string sep = mapnik::util::trim_copy(separator);
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if (sep.empty()) sep = detail::detect_separator(csv_line);
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separator_ = sep;
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// set back to start
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stream.seekg(0, std::ios::beg);
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std::string esc = mapnik::util::trim_copy(escape);
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if (esc.empty()) esc = "\\";
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std::string quo = mapnik::util::trim_copy(quote);
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if (quo.empty()) quo = "\"";
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MAPNIK_LOG_DEBUG(csv) << "csv_datasource: csv grammar: sep: '" << sep
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<< "' quo: '" << quo << "' esc: '" << esc << "'";
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int line_number = 1;
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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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auto headers = csv_utils::parse_line(manual_headers_, sep);
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for (auto const& header : headers)
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{
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std::string val = mapnik::util::trim_copy(header);
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detail::locate_geometry_column(val, index++, locator_);
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headers_.push_back(val);
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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 (std::getline(stream,csv_line,stream.widen(newline)))
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{
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try
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{
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auto headers = csv_utils::parse_line(csv_line, sep);
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// skip blank lines
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std::string val;
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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 const& header : headers)
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{
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val = mapnik::util::trim_copy(header);
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if (val.empty())
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{
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if (strict_)
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{
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std::ostringstream s;
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s << "CSV Plugin: expected a column header at line ";
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s << line_number << ", column " << index;
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s << " - ensure this row contains valid header fields: '";
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s << csv_line << "'\n";
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throw mapnik::datasource_exception(s.str());
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}
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else
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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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headers_.push_back(s.str());
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}
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}
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else
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{
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detail::locate_geometry_column(val, index, locator_);
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headers_.push_back(val);
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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 Plugin: error parsing headers: ");
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s += ex.what();
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throw mapnik::datasource_exception(s);
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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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throw mapnik::datasource_exception("CSV Plugin: 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");
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}
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mapnik::value_integer feature_count = 0;
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bool extent_started = false;
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std::size_t num_headers = headers_.size();
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std::for_each(headers_.begin(), headers_.end(),
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[ & ](std::string const& header){ ctx_->push(header); });
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mapnik::transcoder tr(desc_.get_encoding());
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auto pos = stream.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 std::getline 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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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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std::vector<item_type> boxes;
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while (is_first_row || std::getline(stream, csv_line, stream.widen(newline)))
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{
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if ((row_limit_ > 0) && (line_number++ > row_limit_))
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{
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MAPNIK_LOG_DEBUG(csv) << "csv_datasource: row limit hit, exiting at feature: " << feature_count;
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break;
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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 = stream.tellg();
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is_first_row = false;
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// skip blank lines
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unsigned line_length = csv_line.length();
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if (line_length <= 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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MAPNIK_LOG_DEBUG(csv) << "csv_datasource: empty row encountered at line: " << line_number;
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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, sep);
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unsigned num_fields = values.size();
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if (num_fields > num_headers)
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{
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std::ostringstream s;
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s << "CSV Plugin: # 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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throw mapnik::datasource_exception(s.str());
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}
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else if (num_fields < num_headers)
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{
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std::ostringstream s;
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s << "CSV Plugin: # of headers("
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<< num_headers << ") > # of columns("
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<< num_fields << ") parsed for row " << line_number << "\n";
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if (strict_)
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{
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throw mapnik::datasource_exception(s.str());
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}
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else
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{
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MAPNIK_LOG_WARN(csv) << s.str();
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}
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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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boxes.emplace_back(std::move(box), make_pair(record_offset, record_size));
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if (!extent_initialized_)
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{
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if (!extent_started)
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{
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extent_started = true;
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extent_ = mapnik::geometry::envelope(geom);
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}
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else
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{
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extent_.expand_to_include(mapnik::geometry::envelope(geom));
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}
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}
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if (++feature_count != 1) continue;
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auto beg = values.begin();
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auto end = values.end();
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for (std::size_t i = 0; i < num_headers; ++i)
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{
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std::string const& header = headers_.at(i);
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if (beg == end) // there are more headers than column values for this row
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{
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// add an empty string here to represent a missing value
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// not using null type here since nulls are not a csv thing
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if (feature_count == 1)
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{
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desc_.add_descriptor(mapnik::attribute_descriptor(header, mapnik::String));
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}
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// continue here instead of break so that all missing values are
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// encoded consistenly as empty strings
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continue;
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}
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std::string value = mapnik::util::trim_copy(*beg++);
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int value_length = value.length();
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if (locator_.index == i && (locator_.type == detail::geometry_column_locator::WKT
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|| locator_.type == detail::geometry_column_locator::GEOJSON)) continue;
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// First we detect likely strings,
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// then try parsing likely numbers,
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// then try converting to bool,
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// finally falling back to string type.
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// An empty string or a string of "null" will be parsed
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// as a string rather than a true null value.
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// Likely strings are either empty values, very long values
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// or values with leading zeros like 001 (which are not safe
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// to assume are numbers)
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bool matched = false;
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bool has_dot = value.find(".") != std::string::npos;
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if (value.empty() || (value_length > 20) || (value_length > 1 && !has_dot && value[0] == '0'))
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{
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matched = true;
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desc_.add_descriptor(mapnik::attribute_descriptor(header, mapnik::String));
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}
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else if (csv_utils::is_likely_number(value))
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{
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bool has_e = value.find("e") != std::string::npos;
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if (has_dot || has_e)
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{
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double float_val = 0.0;
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if (mapnik::util::string2double(value,float_val))
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{
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matched = true;
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desc_.add_descriptor(mapnik::attribute_descriptor(header,mapnik::Double));
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}
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}
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else
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{
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mapnik::value_integer int_val = 0;
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if (mapnik::util::string2int(value,int_val))
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{
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matched = true;
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desc_.add_descriptor(mapnik::attribute_descriptor(header,mapnik::Integer));
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}
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}
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}
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if (!matched)
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{
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// NOTE: we don't use mapnik::util::string2bool
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// here because we don't want to treat 'on' and 'off'
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// as booleans, only 'true' and 'false'
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if (csv_utils::ignore_case_equal(value, "true") || csv_utils::ignore_case_equal(value, "false"))
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{
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desc_.add_descriptor(mapnik::attribute_descriptor(header, mapnik::Boolean));
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}
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else // fallback to normal string
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{
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desc_.add_descriptor(mapnik::attribute_descriptor(header, mapnik::String));
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}
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}
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}
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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 Plugin: expected geometry column: could not parse row "
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<< line_number << " "
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<< values[locator_.index] << "'";
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if (strict_)
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{
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throw mapnik::datasource_exception(s.str());
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}
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else
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{
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MAPNIK_LOG_ERROR(csv) << s.str();
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}
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}
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}
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catch (mapnik::datasource_exception const& ex )
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{
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if (strict_) throw ex;
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else
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{
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MAPNIK_LOG_ERROR(csv) << ex.what();
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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 Plugin: 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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if (strict_)
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{
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throw mapnik::datasource_exception(s.str());
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}
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else
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{
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MAPNIK_LOG_ERROR(csv) << s.str();
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}
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}
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}
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// bulk insert initialise r-tree
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tree_ = std::make_unique<spatial_index_type>(boxes);
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}
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const char * csv_datasource::name()
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{
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return "csv";
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}
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datasource::datasource_t csv_datasource::type() const
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{
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return datasource::Vector;
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}
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mapnik::box2d<double> csv_datasource::envelope() const
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{
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return extent_;
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}
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mapnik::layer_descriptor csv_datasource::get_descriptor() const
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{
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return desc_;
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}
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template <typename T>
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boost::optional<mapnik::datasource_geometry_t> csv_datasource::get_geometry_type_impl(T & stream) const
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{
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boost::optional<mapnik::datasource_geometry_t> result;
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int multi_type = 0;
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auto itr = tree_->qbegin(boost::geometry::index::intersects(extent_));
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auto end = tree_->qend();
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for (std::size_t count = 0; itr !=end && count < 5; ++itr, ++count)
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{
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csv_datasource::item_type const& item = *itr;
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std::size_t file_offset = item.second.first;
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std::size_t size = item.second.second;
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stream.seekg(file_offset);
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std::vector<char> record;
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record.resize(size);
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stream.read(record.data(), size);
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std::string str(record.begin(), record.end());
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try
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{
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auto values = csv_utils::parse_line(str, separator_);
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auto geom = detail::extract_geometry(values, locator_);
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result = mapnik::util::to_ds_type(geom);
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if (result)
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{
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int type = static_cast<int>(*result);
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if (multi_type > 0 && multi_type != type)
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{
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result.reset(mapnik::datasource_geometry_t::Collection);
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return result;
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}
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multi_type = type;
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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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if (strict_) throw ex;
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else MAPNIK_LOG_ERROR(csv) << ex.what();
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}
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}
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return result;
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}
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boost::optional<mapnik::datasource_geometry_t> csv_datasource::get_geometry_type() const
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{
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if (inline_string_.empty())
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{
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#if defined (_WINDOWS)
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std::ifstream in(mapnik::utf8_to_utf16(filename_),std::ios_base::in | std::ios_base::binary);
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#else
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std::ifstream in(filename_.c_str(),std::ios_base::in | std::ios_base::binary);
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#endif
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if (!in.is_open())
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{
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throw mapnik::datasource_exception("CSV Plugin: could not open: '" + filename_ + "'");
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|
}
|
|
return get_geometry_type_impl(in);
|
|
}
|
|
else
|
|
{
|
|
std::stringstream in(inline_string_);
|
|
return get_geometry_type_impl(in);
|
|
}
|
|
}
|
|
|
|
mapnik::featureset_ptr csv_datasource::features(mapnik::query const& q) const
|
|
{
|
|
|
|
for (auto const& name : q.property_names())
|
|
{
|
|
bool found_name = false;
|
|
for (auto const& header : headers_)
|
|
{
|
|
if (header == name)
|
|
{
|
|
found_name = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found_name)
|
|
{
|
|
std::ostringstream s;
|
|
s << "CSV Plugin: no attribute '" << name << "'. Valid attributes are: "
|
|
<< boost::algorithm::join(headers_, ",") << ".";
|
|
throw mapnik::datasource_exception(s.str());
|
|
}
|
|
}
|
|
|
|
mapnik::box2d<double> const& box = q.get_bbox();
|
|
if (extent_.intersects(box))
|
|
{
|
|
csv_featureset::array_type index_array;
|
|
if (tree_)
|
|
{
|
|
tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
|
|
std::sort(index_array.begin(),index_array.end(),
|
|
[] (item_type const& item0, item_type const& item1)
|
|
{
|
|
return item0.second.first < item1.second.first;
|
|
});
|
|
if (inline_string_.empty())
|
|
{
|
|
return std::make_shared<csv_featureset>(filename_, locator_, separator_, headers_, ctx_, std::move(index_array));
|
|
}
|
|
else
|
|
{
|
|
return std::make_shared<csv_inline_featureset>(inline_string_, locator_, separator_, headers_, ctx_, std::move(index_array));
|
|
}
|
|
}
|
|
}
|
|
return mapnik::featureset_ptr();
|
|
}
|
|
|
|
mapnik::featureset_ptr csv_datasource::features_at_point(mapnik::coord2d const& pt, double tol) const
|
|
{
|
|
mapnik::box2d<double> query_bbox(pt, pt);
|
|
query_bbox.pad(tol);
|
|
mapnik::query q(query_bbox);
|
|
std::vector<mapnik::attribute_descriptor> const& desc = desc_.get_descriptors();
|
|
for (auto const& item : desc)
|
|
{
|
|
q.add_property_name(item.get_name());
|
|
}
|
|
return features(q);
|
|
}
|