I have seen the parsing with JAVA but i need to parse the same IFC extension files which consists of object oriented framework and entity represented blocks using javascript or perl. A basic idea will be a lot helpful.
Sample IFC File:
ISO-10303-21;
HEADER;
FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
FILE_NAME(
/* name */ 'C:\\sample.ifc',
/* time_stamp */ '2012-05-18T13:15:15',
/* authorization */ 'None');
FILE_SCHEMA (('IFC2X3'));
ENDSEC;
DATA;
#1= IFCAPPLICATION(#2,'0.5.29.0','ssiRhinoIFC - Geometry Gym Plug-in for Rhino3d','ssiRhinoIFC');
#2= IFCORGANIZATION($,'Geometry Gym Pty Ltd',$,$,$);
#3= IFCPERSONANDORGANIZATION(#4,#5,$);
#4= IFCPERSON($,'Jon',$,$,$,$,$,$);
#5= IFCORGANIZATION($,'UNKNOWN',$,$,$);
#6= IFCOWNERHISTORY(#3,#1,$,.ADDED.,1337346830,$,$,1337346830);
#7= IFCCARTESIANPOINT((0.0,0.0,0.0));
#8= IFCDIRECTION((1.0,0.0,0.0));
ENDSEC;
END-ISO-10303-21;
Which file format is being used? If it's IFC-XML, you could look at using the Perl-XML module.
http://perl-xml.sourceforge.net/faq/