Re: gEDA-user: pcb doesn't find my pins

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Fri, 2010-03-05 at 20:29 -0500, Jim wrote:

> >    So is this supposed to be element "U102-J1" 's pin "1", or is the
> >    element "U102" 's pin "J1-1".
> >    The point is that we chose to use "-" as a name/number separator. It is
> >    reasonable to choose a single reserved character for that purpose in a
> >    lightweight protocol like our netlist format. We could of course allow
> >    the escape that "--" becomes a literal hyphen in the string (which I
> >    don't think we've done). That won't solve the instant problem until
> >    both the netlister and netlist reader are changed to add that facility.
> >    Frankly I don't see it as much of a problem to just treat it as a
> >    reserved character and leave the code alone. But there are always
> >    people that want to put "/" in their filenames and name their variable
> >    "if" in C code.
> >   
> Not that I understand all the implications here, but if I were coding 
> something that might have multiple dashes and the last dash separated a 
> name/number it would be trivial to treat all the dashes as part of the 
> name except the last one.  I understand that's not the way it appears to 
> be written, but it's not a seriously difficult programming problem. 

The issue is that we don't define anywhere the rule that the "last" dash
separates the name-pinnumber. (See Harry's note above, e.g.:)

U102-J1-1, we don't have a rule as to how this separates:

U101 pin "J1-1"
or
"U101-J1" pin "1"

Indeed, in your previous case, your suggestion would not do what you
want.. since your pinnumbers had a dashes in them.

I hope since we've been able to work-around the issue for now, we can
live with the "-" issue. Its not really bitten anyone before, and if it
becomes an issue, perhaps we can get gnetlist / gsymcheck to flag such
things with a warning.

Best wishes,

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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