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Add possibility to change xml root node name from cereal #832

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Add possibility to change xml root node name from cereal #832

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40 changes: 36 additions & 4 deletions include/cereal/archives/xml.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -185,6 +185,37 @@ namespace cereal
itsOS.precision( options.itsPrecision );
}

//! Construct, outputting to the provided stream upon destruction
/*! @param stream The stream to output to. Note that XML is only guaranteed to flush
its output to the stream upon destruction.
@param rootNodeName The name of the root node
@param options The XML specific options to use. See the Options struct
for the values of default parameters */
XMLOutputArchive( std::ostream & stream, std::string const & rootNodeName, Options const & options = Options::Default() ) :
OutputArchive<XMLOutputArchive>(this),
itsStream(stream),
itsOutputType( options.itsOutputType ),
itsIndent( options.itsIndent ),
itsSizeAttributes(options.itsSizeAttributes)
{
// rapidxml will delete all allocations when xml_document is cleared
auto node = itsXML.allocate_node( rapidxml::node_declaration );
node->append_attribute( itsXML.allocate_attribute( "version", "1.0" ) );
node->append_attribute( itsXML.allocate_attribute( "encoding", "utf-8" ) );
itsXML.append_node( node );

// allocate root node
auto root = itsXML.allocate_node( rapidxml::node_element, rootNodeName.c_str(), 0, rootNodeName.size() );
itsXML.append_node( root );
itsNodes.emplace( root );

// set attributes on the streams
itsStream << std::boolalpha;
itsStream.precision( options.itsPrecision );
itsOS << std::boolalpha;
itsOS.precision( options.itsPrecision );
}

//! Destructor, flushes the XML
~XMLOutputArchive() CEREAL_NOEXCEPT
{
Expand Down Expand Up @@ -414,7 +445,7 @@ namespace cereal
as serialization starts

@param stream The stream to read from. Can be a stringstream or a file. */
XMLInputArchive( std::istream & stream ) :
XMLInputArchive( std::istream & stream, std::string const & rootNodeName = xml_detail::CEREAL_XML_STRING ) :
InputArchive<XMLInputArchive>( this ),
itsData( std::istreambuf_iterator<char>( stream ), std::istreambuf_iterator<char>() )
{
Expand All @@ -436,9 +467,10 @@ namespace cereal
}

// Parse the root
auto root = itsXML.first_node( xml_detail::CEREAL_XML_STRING );
if( root == nullptr )
throw Exception("Could not detect cereal root node - likely due to empty or invalid input");
auto root = itsXML.first_node( rootNodeName.c_str() );
if( root == nullptr ) {
throw Exception("Could not detect " + rootNodeName + " root node - likely due to empty or invalid input");
}
else
itsNodes.emplace( root );
}
Expand Down