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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2007 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
*
*****************************************************************************/
#include <mapnik/libxml2_loader.hpp>
#include <mapnik/config_error.hpp>
#include <boost/utility.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/filesystem/operations.hpp>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/parserInternals.h>
#include <iostream>
using boost::property_tree::ptree;
using namespace std;
namespace mapnik
{
class libxml2_loader : boost::noncopyable
{
public:
libxml2_loader() :
ctx_( 0 )
{
LIBXML_TEST_VERSION;
}
~libxml2_loader()
{
if (ctx_ && ctx_->myDoc)
{
xmlFreeDoc( ctx_->myDoc );
}
if (ctx_)
{
xmlFreeParserCtxt(ctx_);
}
}
void load( const std::string & filename, ptree & pt )
{
boost::filesystem::path path(filename);
if ( ! boost::filesystem::exists( path ) ) {
throw config_error(string("Could not load map file '") +
filename + "': File does not exist");
}
ctx_ = xmlCreateFileParserCtxt( filename.c_str() );
if ( ! ctx_ )
{
throw std::runtime_error("Failed to create parser context.");
}
ctx_->replaceEntities = true;
ctx_->keepBlanks = false;
xmlCtxtUseOptions( ctx_, XML_PARSE_NOERROR | XML_PARSE_NOENT | XML_PARSE_NOBLANKS |
XML_PARSE_DTDLOAD);
xmlParseDocument( ctx_ );
if ( ! ctx_->wellFormed )
{
xmlError * error = xmlCtxtGetLastError( ctx_ );
std::ostringstream os;
os << "XML document not well formed";
if (error)
{
os << ": " << std::endl << error->message;
// remove CR
std::string msg = os.str().substr(0, os.str().size() - 1);
config_error ex( msg );
os.str("");
os << "in file '" << error->file << "' at line "
<< error->line;
ex.append_context( os.str() );
throw ex;
}
}
/*
if ( ! ctx->valid )
{
std::clog << "### ERROR: Failed to validate DTD."
<< std::endl;
}
*/
xmlNode * root( 0 );
root = xmlDocGetRootElement( ctx_->myDoc );
if ( ! root ) {
throw config_error("XML document is empty.");
}
populate_tree( root, pt );
}
private:
void append_attributes( xmlAttr * attributes, ptree & pt)
{
if (attributes)
{
ptree::iterator it = pt.push_back( ptree::value_type( "<xmlattr>", ptree() ));
ptree & attr_list = it->second;
xmlAttr * cur_attr = attributes;
for (; cur_attr; cur_attr = cur_attr->next )
{
ptree::iterator it = attr_list.push_back(
ptree::value_type( (char*)cur_attr->name, ptree() ));
it->second.put_own( (char*) cur_attr->children->content );
}
}
}
void populate_tree( xmlNode * node, ptree & pt )
{
xmlNode * cur_node = node;
for (; cur_node; cur_node = cur_node->next )
{
switch (cur_node->type)
{
case XML_ELEMENT_NODE:
{
ptree::iterator it = pt.push_back( ptree::value_type(
(char*)cur_node->name, ptree() ));
append_attributes( cur_node->properties, it->second);
populate_tree( cur_node->children, it->second );
}
break;
case XML_TEXT_NODE:
pt.put_own( (char*) cur_node->content );
break;
case XML_COMMENT_NODE:
{
ptree::iterator it = pt.push_back(
ptree::value_type( "<xmlcomment>", ptree() ));
it->second.put_own( (char*) cur_node->content );
}
break;
default:
break;
}
}
}
xmlParserCtxtPtr ctx_;
};
void read_xml2( std::string const & filename, boost::property_tree::ptree & pt)
{
libxml2_loader loader;
loader.load( filename, pt );
}
} // end of namespace mapnik
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