View source for Original RTL language

'''Q: How do I know what language a Netlist in the netlist database comes from?'''

Use attribute " language" (note the leading space):

    Netlist *nl;
    nl->GetAttValue(" language") 

returns one of "vhdl", "verilog", "edif", "synlib".

Or you can use one of these APIs:

    Netlist::IsFromVerilog()
    Netlist::IsFromVhdl()
    Netlist::IsFromEdif()
    Netlist::IsFromSynlib()