How to use the lesscpy.lessc.parser.LessParser function in lesscpy

if hasattr(tok,
                           "lexer"):  # literals don't have the lexer attribute
                    print(tok, "State:", tok.lexer.lexstate)
                else:
                    print(tok)
            print('EOF')
            sys.exit()
        #
        #    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        #
        yacctab = 'yacctab' if args.debug else None
        scope = None
        if args.include:
            for u in args.include.split(','):
                if os.path.exists(u):
                    p = parser.LessParser(
                        yacc_debug=(args.debug),
                        lex_optimize=True,
                        yacc_optimize=(not args.debug),
                        tabfile=yacctab,
                        verbose=args.verbose)
                    p.parse(filename=u, debuglevel=args.debug)
                    if not scope:
                        scope = p.scope
                    else:
                        scope.update(p.scope)
                else:
                    sys.exit('included file `%s` not found ...' % u)
                sys.stdout.flush()
        p = None
        f = formatter.Formatter(args)
        if not os.path.exists(args.target):