DataFile.cpp

/*
 * DataFile.cpp - implementation of class DataFile
 *
 * Copyright (c) 2004-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
 * Copyright (c) 2012-2013 Paul Giblock    <p/at/pgiblock.net>
 *
 * This file is part of LMMS - http://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */


#include "DataFile.h"

#include <math.h>

#include <QDebug>
#include <QFile>
#include <QFileInfo>
#include <QMessageBox>
#include <QTextStream>

#include "base64.h"
#include "ConfigManager.h"
#include "Effect.h"
#include "GuiApplication.h"
#include "lmmsversion.h"
#include "PluginFactory.h"
#include "ProjectVersion.h"
#include "SongEditor.h"




DataFile::typeDescStruct
		DataFile::s_types[DataFile::TypeCount] =
{
	{ DataFile::UnknownType, "unknown" },
	{ DataFile::SongProject, "song" },
	{ DataFile::SongProjectTemplate, "songtemplate" },
	{ DataFile::InstrumentTrackSettings, "instrumenttracksettings" },
	{ DataFile::DragNDropData, "dnddata" },
	{ DataFile::ClipboardData, "clipboard-data" },
	{ DataFile::JournalData, "journaldata" },
	{ DataFile::EffectSettings, "effectsettings" }
} ;



DataFile::LocaleHelper::LocaleHelper( Mode mode )
{
	switch( mode )
	{
		case ModeLoad:
			// set a locale for which QString::fromFloat() returns valid values if
			// floating point separator is a comma - otherwise we would fail to load
			// older projects made by people from various countries due to their
			// locale settings
		    QLocale::setDefault( QLocale::German );
			break;

		case ModeSave:
			// set default locale to C so that floating point decimals are rendered to
			// strings with periods as decimal point instead of commas in some countries
			QLocale::setDefault( QLocale::C );

		default: break;
	}
}



DataFile::LocaleHelper::~LocaleHelper()
{
	// revert to original locale
	QLocale::setDefault( QLocale::system() );
}




DataFile::DataFile( Type type ) :
	QDomDocument( "lmms-project" ),
	m_content(),
	m_head(),
	m_type( type )
{
	appendChild( createProcessingInstruction("xml", "version=\"1.0\""));
	QDomElement root = createElement( "lmms-project" );
	root.setAttribute( "version", LDF_VERSION_STRING );
	root.setAttribute( "type", typeName( type ) );
	root.setAttribute( "creator", "LMMS" );
	root.setAttribute( "creatorversion", LMMS_VERSION );
	appendChild( root );

	m_head = createElement( "head" );
	root.appendChild( m_head );

	m_content = createElement( typeName( type ) );
	root.appendChild( m_content );

}




DataFile::DataFile( const QString & _fileName ) :
	QDomDocument(),
	m_content(),
	m_head()
{
	QFile inFile( _fileName );
	if( !inFile.open( QIODevice::ReadOnly ) )
	{
		if( gui )
		{
			QMessageBox::critical( NULL,
				SongEditor::tr( "Could not open file" ),
				SongEditor::tr( "Could not open file %1. You probably "
						"have no permissions to read this "
						"file.\n Please make sure to have at "
						"least read permissions to the file "
						"and try again." ).arg( _fileName ) );
		}

		return;
	}

	loadData( inFile.readAll(), _fileName );
}




DataFile::DataFile( const QByteArray & _data ) :
	QDomDocument(),
	m_content(),
	m_head()
{
	loadData( _data, "<internal data>" );
}




DataFile::~DataFile()
{
}




bool DataFile::validate( QString extension )
{
	switch( m_type )
	{
	case Type::SongProject:
		if( extension == "mmp" || extension == "mmpz" )
		{
			return true;
		}
		break;
	case Type::SongProjectTemplate:
		if(  extension == "mpt" )
		{
			return true;
		}
		break;
	case Type::InstrumentTrackSettings:
		if ( extension == "xpf" || extension == "xml" )
		{
			return true;
		}
		break;
	case Type::UnknownType:
		if (! ( extension == "mmp" || extension == "mpt" || extension == "mmpz" ||
				extension == "xpf" || extension == "xml" ||
				( extension == "xiz" && ! pluginFactory->pluginSupportingExtension(extension).isNull()) ||
				extension == "sf2" || extension == "pat" || extension == "mid" ||
				extension == "flp" || extension == "dll"
				) )
		{
			return true;
		}
		if( extension == "wav" || extension == "ogg" ||
				extension == "ds" )
		{
			return true;
		}
		break;
	default:
		return false;
	}
	return false;
}




QString DataFile::nameWithExtension( const QString & _fn ) const
{
	switch( type() )
	{
		case SongProject:
			if( _fn.section( '.', -1 ) != "mmp" &&
					_fn.section( '.', -1 ) != "mpt" &&
					_fn.section( '.', -1 ) != "mmpz" )
			{
				if( ConfigManager::inst()->value( "app",
						"nommpz" ).toInt() == 0 )
				{
					return _fn + ".mmpz";
				}
				return _fn + ".mmp";
			}
			break;
		case SongProjectTemplate:
			if( _fn.section( '.',-1 ) != "mpt" )
			{
				return _fn + ".mpt";
			}
			break;
		case InstrumentTrackSettings:
			if( _fn.section( '.', -1 ) != "xpf" )
			{
				return _fn + ".xpf";
			}
			break;
		default: ;
	}
	return _fn;
}




void DataFile::write( QTextStream & _strm )
{
	if( type() == SongProject || type() == SongProjectTemplate
					|| type() == InstrumentTrackSettings )
	{
		cleanMetaNodes( documentElement() );
	}

	save(_strm, 2);
}




bool DataFile::writeFile( const QString& filename )
{
	const QString fullName = nameWithExtension( filename );
	const QString fullNameTemp = fullName + ".new";
	const QString fullNameBak = fullName + ".bak";

	QFile outfile( fullNameTemp );

	if( !outfile.open( QIODevice::WriteOnly | QIODevice::Truncate ) )
	{
		if( gui )
		{
			QMessageBox::critical( NULL,
				SongEditor::tr( "Could not write file" ),
				SongEditor::tr( "Could not open %1 for writing. You probably are not permitted to "
								"write to this file. Please make sure you have write-access to "
								"the file and try again." ).arg( fullName ) );
		}

		return false;
	}

	if( fullName.section( '.', -1 ) == "mmpz" )
	{
		QString xml;
		QTextStream ts( &xml );
		write( ts );
		outfile.write( qCompress( xml.toUtf8() ) );
	}
	else
	{
		QTextStream ts( &outfile );
		write( ts );
	}

	outfile.close();

	// make sure the file has been written correctly
	if( QFileInfo( outfile.fileName() ).size() > 0 )
	{
		if( ConfigManager::inst()->value( "app", "disablebackup" ).toInt() )
		{
			// remove current file
			QFile::remove( fullName );
		}
		else
		{
			// remove old backup file
			QFile::remove( fullNameBak );
			// move current file to backup file
			QFile::rename( fullName, fullNameBak );
		}
		// move temporary file to current file
		QFile::rename( fullNameTemp, fullName );

		return true;
	}

	return false;
}




DataFile::Type DataFile::type( const QString& typeName )
{
	for( int i = 0; i < TypeCount; ++i )
	{
		if( s_types[i].m_name == typeName )
		{
			return static_cast<DataFile::Type>( i );
		}
	}

	// compat code
	if( typeName == "channelsettings" )
	{
		return DataFile::InstrumentTrackSettings;
	}

	return UnknownType;
}




QString DataFile::typeName( Type type )
{
	if( type >= UnknownType && type < TypeCount )
	{
		return s_types[type].m_name;
	}

	return s_types[UnknownType].m_name;
}




void DataFile::cleanMetaNodes( QDomElement _de )
{
	QDomNode node = _de.firstChild();
	while( !node.isNull() )
	{
		if( node.isElement() )
		{
			if( node.toElement().attribute( "metadata" ).toInt() )
			{
				QDomNode ns = node.nextSibling();
				_de.removeChild( node );
				node = ns;
				continue;
			}
			if( node.hasChildNodes() )
			{
				cleanMetaNodes( node.toElement() );
			}
		}
		node = node.nextSibling();
	}
}


void DataFile::upgrade_0_2_1_20070501()
{
	// Upgrade to version 0.2.1-20070501
	QDomNodeList list = elementsByTagName( "arpandchords" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if( el.hasAttribute( "arpdir" ) )
		{
			int arpdir = el.attribute( "arpdir" ).toInt();
			if( arpdir > 0 )
			{
				el.setAttribute( "arpdir", arpdir - 1 );
			}
			else
			{
				el.setAttribute( "arpdisabled", "1" );
			}
		}
	}

	list = elementsByTagName( "sampletrack" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if( el.attribute( "vol" ) != "" )
		{
			el.setAttribute( "vol", el.attribute(
					"vol" ).toFloat() * 100.0f );
		}
		else
		{
			QDomNode node = el.namedItem(
						"automation-pattern" );
			if( !node.isElement() ||
				!node.namedItem( "vol" ).isElement() )
			{
				el.setAttribute( "vol", 100.0f );
			}
		}
	}

	list = elementsByTagName( "ladspacontrols" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		QDomNode anode = el.namedItem( "automation-pattern" );
		QDomNode node = anode.firstChild();
		while( !node.isNull() )
		{
			if( node.isElement() )
			{
				QString name = node.nodeName();
				if( name.endsWith( "link" ) )
				{
					el.setAttribute( name,
						node.namedItem( "time" )
						.toElement()
						.attribute( "value" ) );
					QDomNode oldNode = node;
					node = node.nextSibling();
					anode.removeChild( oldNode );
					continue;
				}
			}
			node = node.nextSibling();
		}
	}

	QDomNode node = m_head.firstChild();
	while( !node.isNull() )
	{
		if( node.isElement() )
		{
			if( node.nodeName() == "bpm" )
			{
				int value = node.toElement().attribute(
						"value" ).toInt();
				if( value > 0 )
				{
					m_head.setAttribute( "bpm",
								value );
					QDomNode oldNode = node;
					node = node.nextSibling();
					m_head.removeChild( oldNode );
					continue;
				}
			}
			else if( node.nodeName() == "mastervol" )
			{
				int value = node.toElement().attribute(
						"value" ).toInt();
				if( value > 0 )
				{
					m_head.setAttribute(
						"mastervol", value );
					QDomNode oldNode = node;
					node = node.nextSibling();
					m_head.removeChild( oldNode );
					continue;
				}
			}
			else if( node.nodeName() == "masterpitch" )
			{
				m_head.setAttribute( "masterpitch",
					-node.toElement().attribute(
						"value" ).toInt() );
				QDomNode oldNode = node;
				node = node.nextSibling();
				m_head.removeChild( oldNode );
				continue;
			}
		}
		node = node.nextSibling();
	}
}


void DataFile::upgrade_0_2_1_20070508()
{
	// Upgrade to version 0.2.1-20070508 from some version greater than or equal to 0.2.1-20070501
	QDomNodeList list = elementsByTagName( "arpandchords" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if( el.hasAttribute( "chorddisabled" ) )
		{
			el.setAttribute( "chord-enabled",
				!el.attribute( "chorddisabled" )
							.toInt() );
			el.setAttribute( "arp-enabled",
				!el.attribute( "arpdisabled" )
							.toInt() );
		}
		else if( !el.hasAttribute( "chord-enabled" ) )
		{
			el.setAttribute( "chord-enabled", true );
			el.setAttribute( "arp-enabled",
				el.attribute( "arpdir" ).toInt() != 0 );
		}
	}

	while( !( list = elementsByTagName( "channeltrack" ) ).isEmpty() )
	{
		QDomElement el = list.item( 0 ).toElement();
		el.setTagName( "instrumenttrack" );
	}

	list = elementsByTagName( "instrumenttrack" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if( el.hasAttribute( "vol" ) )
		{
			float value = el.attribute( "vol" ).toFloat();
			value = roundf( value * 0.585786438f );
			el.setAttribute( "vol", value );
		}
		else
		{
			QDomNodeList vol_list = el.namedItem(
						"automation-pattern" )
					.namedItem( "vol" ).toElement()
					.elementsByTagName( "time" );
			for( int j = 0; !vol_list.item( j ).isNull();
								++j )
			{
				QDomElement timeEl = list.item( j )
							.toElement();
				int value = timeEl.attribute( "value" )
							.toInt();
				value = (int)roundf( value *
							0.585786438f );
				timeEl.setAttribute( "value", value );
			}
		}
	}
}


void DataFile::upgrade_0_3_0_rc2()
{
	// Upgrade to version 0.3.0-rc2 from some version greater than or equal to 0.2.1-20070508
	QDomNodeList list = elementsByTagName( "arpandchords" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if( el.attribute( "arpdir" ).toInt() > 0 )
		{
			el.setAttribute( "arpdir",
				el.attribute( "arpdir" ).toInt() - 1 );
		}
	}
}


void DataFile::upgrade_0_3_0()
{
	// Upgrade to version 0.3.0 (final) from some version greater than or equal to 0.3.0-rc2
	QDomNodeList list;
	while( !( list = elementsByTagName(
				"pluckedstringsynth" ) ).isEmpty() )
	{
		QDomElement el = list.item( 0 ).toElement();
		el.setTagName( "vibedstrings" );
		el.setAttribute( "active0", 1 );
	}

	while( !( list = elementsByTagName( "lb303" ) ).isEmpty() )
	{
		QDomElement el = list.item( 0 ).toElement();
		el.setTagName( "lb302" );
	}

	while( !( list = elementsByTagName( "channelsettings" ) ).
							isEmpty() )
	{
		QDomElement el = list.item( 0 ).toElement();
		el.setTagName( "instrumenttracksettings" );
	}
}


void DataFile::upgrade_0_4_0_20080104()
{
	// Upgrade to version 0.4.0-20080104 from some version greater than or equal to 0.3.0 (final)
	QDomNodeList list = elementsByTagName( "fx" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if( el.hasAttribute( "fxdisabled" ) &&
			el.attribute( "fxdisabled" ).toInt() == 0 )
		{
			el.setAttribute( "enabled", 1 );
		}
	}
}


void DataFile::upgrade_0_4_0_20080118()
{
	// Upgrade to version 0.4.0-20080118 from some version greater than or equal to 0.4.0-20080104
	QDomNodeList list;
	while( !( list = elementsByTagName( "fx" ) ).isEmpty() )
	{
		QDomElement fxchain = list.item( 0 ).toElement();
		fxchain.setTagName( "fxchain" );
		QDomNode rack = list.item( 0 ).firstChild();
		QDomNodeList effects = rack.childNodes();
		// move items one level up
		while( effects.count() )
		{
			fxchain.appendChild( effects.at( 0 ) );
		}
		fxchain.setAttribute( "numofeffects",
			rack.toElement().attribute( "numofeffects" ) );
		fxchain.removeChild( rack );
	}
}


void DataFile::upgrade_0_4_0_20080129()
{
	// Upgrade to version 0.4.0-20080129 from some version greater than or equal to 0.4.0-20080118
	QDomNodeList list;
	while( !( list =
		elementsByTagName( "arpandchords" ) ).isEmpty() )
	{
		QDomElement aac = list.item( 0 ).toElement();
		aac.setTagName( "arpeggiator" );
		QDomNode cloned = aac.cloneNode();
		cloned.toElement().setTagName( "chordcreator" );
		aac.parentNode().appendChild( cloned );
	}
}


void DataFile::upgrade_0_4_0_20080409()
{
	// Upgrade to version 0.4.0-20080409 from some version greater than or equal to 0.4.0-20080129
	QStringList s;
	s << "note" << "pattern" << "bbtco" << "sampletco" << "time";
	for( QStringList::iterator it = s.begin(); it < s.end(); ++it )
	{
		QDomNodeList list = elementsByTagName( *it );
		for( int i = 0; !list.item( i ).isNull(); ++i )
		{
			QDomElement el = list.item( i ).toElement();
			el.setAttribute( "pos",
				el.attribute( "pos" ).toInt()*3 );
			el.setAttribute( "len",
				el.attribute( "len" ).toInt()*3 );
		}
	}
	QDomNodeList list = elementsByTagName( "timeline" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		el.setAttribute( "lp0pos",
			el.attribute( "lp0pos" ).toInt()*3 );
		el.setAttribute( "lp1pos",
			el.attribute( "lp1pos" ).toInt()*3 );
	}
}


void DataFile::upgrade_0_4_0_20080607()
{
	// Upgrade to version 0.4.0-20080607 from some version greater than or equal to 0.3.0-20080409
	QDomNodeList list;
	while( !( list = elementsByTagName( "midi" ) ).isEmpty() )
	{
		QDomElement el = list.item( 0 ).toElement();
		el.setTagName( "midiport" );
	}
}


void DataFile::upgrade_0_4_0_20080622()
{
	// Upgrade to version 0.4.0-20080622 from some version greater than or equal to 0.3.0-20080607
	QDomNodeList list;
	while( !( list = elementsByTagName(
				"automation-pattern" ) ).isEmpty() )
	{
		QDomElement el = list.item( 0 ).toElement();
		el.setTagName( "automationpattern" );
	}

	list = elementsByTagName( "bbtrack" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		QString s = el.attribute( "name" );
		s.replace( QRegExp( "^Beat/Baseline " ),
						"Beat/Bassline " );
		el.setAttribute( "name", s );
	}
}


void DataFile::upgrade_0_4_0_beta1()
{
	// Upgrade to version 0.4.0-beta1 from some version greater than or equal to 0.4.0-20080622
	// convert binary effect-key-blobs to XML
	QDomNodeList list;
	list = elementsByTagName( "effect" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		QString k = el.attribute( "key" );
		if( !k.isEmpty() )
		{
			const QList<QVariant> l =
				base64::decode( k, QVariant::List ).toList();
			if( !l.isEmpty() )
			{
				QString name = l[0].toString();
				QVariant u = l[1];
				EffectKey::AttributeMap m;
				// VST-effect?
				if( u.type() == QVariant::String )
				{
					m["file"] = u.toString();
				}
				// LADSPA-effect?
				else if( u.type() == QVariant::StringList )
				{
					const QStringList sl = u.toStringList();
					m["plugin"] = sl.value( 0 );
					m["file"] = sl.value( 1 );
				}
				EffectKey key( NULL, name, m );
				el.appendChild( key.saveXML( *this ) );
			}
		}
	}
}


void DataFile::upgrade_0_4_0_rc2()
{
	// Upgrade to version 0.4.0-rc2 from some version greater than or equal to 0.4.0-beta1
	QDomNodeList list = elementsByTagName( "audiofileprocessor" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		QString s = el.attribute( "src" );
		s.replace( "drumsynth/misc ", "drumsynth/misc_" );
		s.replace( "drumsynth/r&b", "drumsynth/r_n_b" );
		s.replace( "drumsynth/r_b", "drumsynth/r_n_b" );
		el.setAttribute( "src", s );
	}
	list = elementsByTagName( "lb302" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		int s = el.attribute( "shape" ).toInt();
		if( s >= 1 )
		{
			s--;
		}
		el.setAttribute( "shape", QString("%1").arg(s) );
	}
}


void DataFile::upgrade_1_1_91()
{
	// Upgrade to version 1.1.91 from some version less than 1.1.91
	QDomNodeList list = elementsByTagName( "audiofileprocessor" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		QString s = el.attribute( "src" );
		s.replace( QRegExp("/samples/bassloopes/"), "/samples/bassloops/" );
		el.setAttribute( "src", s );
	}

	list = elementsByTagName( "attribute" );
	for( int i = 0; !list.item( i ).isNull(); ++i )
	{
		QDomElement el = list.item( i ).toElement();
		if ( el.attribute( "name" ) == "plugin" && el.attribute( "value" ) == "vocoder-lmms" ) {
			el.setAttribute( "value", "vocoder" );
		}
	}
}


void DataFile::upgrade()
{
	ProjectVersion version =
		documentElement().attribute( "creatorversion" ).
							replace( "svn", "" );

	if( version < "0.2.1-20070501" )
	{
		upgrade_0_2_1_20070501();
	}

	if( version < "0.2.1-20070508" )
	{
		upgrade_0_2_1_20070508();
	}

	if( version < "0.3.0-rc2" )
	{
		upgrade_0_3_0_rc2();
	}

	if( version < "0.3.0" )
	{
		upgrade_0_3_0();
	}

	if( version < "0.4.0-20080104" )
	{
		upgrade_0_4_0_20080104();
	}

	if( version < "0.4.0-20080118" )
	{
		upgrade_0_4_0_20080118();
	}

	if( version < "0.4.0-20080129" )
	{
		upgrade_0_4_0_20080129();
	}

	if( version < "0.4.0-20080409" )
	{
		upgrade_0_4_0_20080409();
	}

	if( version < "0.4.0-20080607" )
	{
		upgrade_0_4_0_20080607();
	}

	if( version < "0.4.0-20080622" )
	{
		upgrade_0_4_0_20080622();
	}

	if( version < "0.4.0-beta1" )
	{
		upgrade_0_4_0_beta1();
	}
	if( version < "0.4.0-rc2" )
	{
		upgrade_0_4_0_rc2();
	}
	if( version < ProjectVersion("1.1.91", CompareType::Release) )
	{
		upgrade_1_1_91();
	}

	// update document meta data
	documentElement().setAttribute( "version", LDF_VERSION_STRING );
	documentElement().setAttribute( "type", typeName( type() ) );
	documentElement().setAttribute( "creator", "LMMS" );
	documentElement().setAttribute( "creatorversion", LMMS_VERSION );

	if( type() == SongProject || type() == SongProjectTemplate )
	{
		// Time-signature
		if ( !m_head.hasAttribute( "timesig_numerator" ) )
		{
			m_head.setAttribute( "timesig_numerator", 4 );
			m_head.setAttribute( "timesig_denominator", 4 );
		}

		if( !m_head.hasAttribute( "mastervol" ) )
		{
			m_head.setAttribute( "mastervol", 100 );
		}
	}
}




void DataFile::loadData( const QByteArray & _data, const QString & _sourceFile )
{
	QString errorMsg;
	int line = -1, col = -1;
	if( !setContent( _data, &errorMsg, &line, &col ) )
	{
		// parsing failed? then try to uncompress data
		QByteArray uncompressed = qUncompress( _data );
		if( !uncompressed.isEmpty() )
		{
			if( setContent( uncompressed, &errorMsg, &line, &col ) )
			{
				line = col = -1;
			}
		}
		if( line >= 0 && col >= 0 )
		{
			qWarning() << "at line" << line << "column" << errorMsg;
			if( gui )
			{
				QMessageBox::critical( NULL,
					SongEditor::tr( "Error in file" ),
					SongEditor::tr( "The file %1 seems to contain "
							"errors and therefore can't be "
							"loaded." ).
								arg( _sourceFile ) );
			}

			return;
		}
	}

	QDomElement root = documentElement();
	m_type = type( root.attribute( "type" ) );
	m_head = root.elementsByTagName( "head" ).item( 0 ).toElement();


	if( root.hasAttribute( "creatorversion" ) )
	{
		// compareType defaults to Build,so it doesn't have to be set here
		ProjectVersion createdWith = root.attribute( "creatorversion" );
		ProjectVersion openedWith = LMMS_VERSION;;

		if ( createdWith != openedWith )
		{
			// only one compareType needs to be set, and we can compare on one line because setCompareType returns ProjectVersion
			if ( createdWith.setCompareType(Minor) != openedWith)
			{
				if( gui != nullptr && root.attribute( "type" ) == "song" )
				{
					QMessageBox::information( NULL,
						SongEditor::tr( "Project Version Mismatch" ),
						SongEditor::tr( 
								"This %1 was created with "
								"LMMS version %2, but version %3 "
								"is installed")
								.arg( _sourceFile.endsWith( ".mpt" ) ?
                                                                        SongEditor::tr("template") :
                                                                        SongEditor::tr("project") )
								.arg( root.attribute( "creatorversion" ) )
								.arg( LMMS_VERSION ) );
				}
			}

			// the upgrade needs to happen after the warning as it updates the project version.
			if( createdWith.setCompareType(Build) < openedWith )
			{
				upgrade();
			}
		}
	}

	m_content = root.elementsByTagName( typeName( m_type ) ).
							item( 0 ).toElement();
}