172 lines
5 KiB
C++
172 lines
5 KiB
C++
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/*****************************************************************************
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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) 2011 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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#ifdef HAVE_LIBXML2
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#error HAVE_LIBXML2 defined but compiling rapidxml_loader.cpp!
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#endif
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// mapnik
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#include <mapnik/xml_loader.hpp>
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#include <boost/property_tree/detail/xml_parser_read_rapidxml.hpp>
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#include <mapnik/xml_node.hpp>
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#include <mapnik/config_error.hpp>
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// boost
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#include <boost/utility.hpp>
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#include <boost/algorithm/string/trim.hpp>
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// stl
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#include <iostream>
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#include <fstream>
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using namespace std;
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namespace rapidxml = boost::property_tree::detail::rapidxml;
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namespace mapnik
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{
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class rapidxml_loader : boost::noncopyable
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{
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public:
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rapidxml_loader(const char *encoding = NULL) :
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filename_()
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{
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}
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~rapidxml_loader()
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{
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}
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void load(const std::string & filename, xml_node &node)
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{
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filename_ = filename;
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std::basic_ifstream<char> stream(filename.c_str());
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if (!stream)
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{
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throw config_error("Could not load map file", 0, filename);
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}
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// TODO: stream.imbue(loc);
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load(stream, node);
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}
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void load(std::basic_istream<char> &stream, xml_node &node)
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{
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stream.unsetf(std::ios::skipws);
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std::vector<char> v(std::istreambuf_iterator<char>(stream.rdbuf()),
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std::istreambuf_iterator<char>());
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if (!stream.good())
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{
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throw config_error("Could not load map file", 0, filename_);
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}
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v.push_back(0); // zero-terminate
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try
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{
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// Parse using appropriate flags
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const int f_tws = rapidxml::parse_normalize_whitespace
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| rapidxml::parse_trim_whitespace;
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rapidxml::xml_document<> doc;
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doc.parse<f_tws>(&v.front());
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for (rapidxml::xml_node<char> *child = doc.first_node();
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child; child = child->next_sibling())
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{
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populate_tree(child, node);
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}
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}
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catch (rapidxml::parse_error &e)
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{
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long line = static_cast<long>(
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std::count(&v.front(), e.where<char>(), '\n') + 1);
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throw config_error(e.what(), line, filename_);
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}
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}
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void load_string(const std::string & buffer, xml_node &node, std::string const & base_path )
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{
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// if (!base_path.empty())
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// {
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// boost::filesystem::path path(base_path);
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// if (!boost::filesystem::exists(path)) {
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// throw config_error(string("Could not locate base_path '") +
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// base_path + "': file or directory does not exist");
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// }
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// }
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load(buffer, node);
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}
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private:
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void populate_tree(rapidxml::xml_node<char> *cur_node, xml_node &node)
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{
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switch (cur_node->type())
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{
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case rapidxml::node_element:
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{
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xml_node &new_node = node.add_child((char *)cur_node->name(), 0, false);
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// Copy attributes
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for (rapidxml::xml_attribute<char> *attr = cur_node->first_attribute();
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attr; attr = attr->next_attribute())
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{
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new_node.add_attribute(attr->name(), attr->value());
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}
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// Copy children
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for (rapidxml::xml_node<char> *child = cur_node->first_node();
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child; child = child->next_sibling())
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{
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populate_tree(child, new_node);
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}
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}
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break;
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// Data nodes
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case rapidxml::node_data:
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case rapidxml::node_cdata:
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{
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std::string trimmed(cur_node->value());
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boost::trim(trimmed);
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if (trimmed.empty()) break; //Don't add empty text nodes
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node.add_child(trimmed, 0, true);
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}
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break;
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default:
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break;
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}
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}
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private:
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std::string filename_;
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};
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void read_xml(std::string const & filename, xml_node &node)
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{
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rapidxml_loader loader;
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loader.load(filename, node);
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}
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void read_xml_string(std::string const & str, xml_node &node, std::string const & base_path)
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{
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rapidxml_loader loader;
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loader.load_string(str, node, base_path);
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}
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} // end of namespace mapnik
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