Re: gEDA-user: gerbv - abnormal exit (2nd attempt)

["David Kerber" <dkerber@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hmmmm.  I'm a java programmer and tomcat server admin by current trade, even
though my degree was in EE, so I might be able to help you out there.  Let
me see what I can come up with...

 

> -----Original Message-----
> From: geda-user-bounces@xxxxxxxxxxxxxx 
> [mailto:geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of 
> wilson1442@xxxxxxxxxxxxx
> Sent: Monday, December 17, 2007 8:05 PM
> To: gEDA user mailing list
> Subject: Re: gEDA-user: gerbv - abnormal exit (2nd attempt)
> 
> Stefan Petersen wrote:
> 
> > 2) The aperture macro also contains operations like $4=$1X$5.
> 
> My copy of "Gerber Format: Plot Data Format Reference Book" 
> is quite old, (c)1993.  But some of the examples use the 
> "$4=" construct to work around the severe restriction on expressions:
> 
>    "Only one operator is allowed between commas.", and
>    "Only one operator is allowed on the right side of the 
> equals sign."
> 
> If one wants to do anything remotely fancy, one almost has to 
> use this gimmick.  I wonder if these restrictions have been 
> eased lately?  Even simple left-to-right without operator 
> precedence would be a big step up.
> 
> I seem to remember running into this problem back with 
> V1.0.2, and thought I might take a whack at fixing it, but I 
> recall gerbv is written mostly in Scheme.  To me, it might as 
> well have been written in Boustrophedon.  I know that Scheme 
> is a beautiful language, and I've taken a couple of stabs at 
> learning it, but  I still don't know my cdr from a hole in the ground!
> 
> Back then, I eventually found a web based viewer hosted on a 
> server by Scott Ananian which did grok the expressions 
> correctly (as far as I could tell), but Scott got his PhD and 
> the server which sat under his desk at MIT is no more.  He 
> sent me his Java sources which must be served up by Tomcat.  
> To me, it's more Boustrophedon!
> 
> Thank you Stefan for checking my stuff.  I hope it stack 
> dumps for you so you'll have an easy time fixing it.  I 
> understand your reluctance to change your parser when it does 
> everything you need for gEDA.
> 
> I may have a look at gerber2pdf.  At least it's written in 
> Python, a language I use often, and there may be some hope of 
> understanding it.
> 
> Thanks again for looking.
> 
> Jim
> 
> 
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