list manipulations

(apologies of this is a duplicate posting, my original seems to have not made it)

Could someone provide some guidance as how to resolve the following. A file which needs to be processed and made into a pline.

The sample file below, is composed of object name, other data, and points.

OPEN P8-160 ,PLAN,-45.59995 , 15
OPEN P8-160 ,PLAN, 0.3000584 , 15
OPEN P8-160 ,PLAN, 0.3000584 ,-15
OPEN P8-160 ,PLAN,-45.59995 ,-15
OPEN P8-160 ,PLAN,-45.59995 , 15
OPEN P8-160 ,PROFILE,-45.59995 ,-15
OPEN P8-160 ,DECK,-45.59995 , 15
TOPN 160 ,PLAN,-45.59995 , -15
TOPN 160 ,PLAN,-55.59995 , 15
TOPN 160 ,PLAN,-55.59995 , 15
TOPN 160 ,PLAN,-45.59995 , -15

Processing:
each line is read from the file
- converted to a list
- cleaned
- modified
then passed to the subroutine below.

The following is result of processing and is then passed one line at a time to the subroutine below.

OPEN P8-160,-45.59995,15
OPEN P8-160, 0.3000584,15
OPEN P8-160, 0.3000584,-15
OPEN P8-160,-45.59995,-15
OPEN P8-160,-45.59995,15
TOPN 160,-45.59995,-15
TOPN 160,-55.59995,15
TOPN 160,-55.59995,15
TOPN 160,-45.59995,-15

Desired finished point lists:

OPEN P8-160,-45.59995,15,0.3000584,15,0.3000584,-15,-45.59995,-15,-45.59995,15
TOPN 160,-45.59995,-15,-55.59995,15,-55.59995,15,-45.59995,-15

Where the OPEN P8-160 and TOPN 160 are the object name of the PLINE created.

Problem:
 my subroutine below almost does the job. It fails to return the last object in the file, in the above example TOPN.

; plz = read-line as list
 ; Xplx = tmp
 ; Xplzz = output list

(defun plplconv (plz / Xplx Xplzz)
  (setq Xplzz nil)
    (if (/= 0 (length Xplx))
     (progn
  (if (/= nil (member (nth 0 plz) Xplx))
           (progn
  (setq Xplx (cons (nth 1 plz) Xplx))
  (setq Xplx (cons (nth 2 plz) Xplx))
  )
  (progn
  (setq Xplzz Xplx)
  (setq Xplx nil)
  (setq Xplx (reverse plz))
  )
  )
     &nbsp
     (progn
  (setq Xplx nil)
  (setq Xplx (reverse plz))
  (setq Xplzz nil)
   &nbsp
  &nbsp
   (reverse Xplzz)
&nbsp

Oh and yes, this needs to be AutoCAD 14 compatible...
Any help you can provide is appreciated.

Joseph-

 

luis, thanks

I should have stated this is more of a collation of list instead of a list manipulation. Still I might learn something from what Ralph Gimenez has written.

joseph