Re: gEDA-user: blue sky ideas - written down finally

[Kai-Martin Knaak <kmk@xxxxxxxxxxxxxxx>]

On Fri, 08 Jan 2010 15:29:25 -0500, DJ Delorie wrote:

> Right, [] is "grouping" and how you map groups to each other determines
> the functionality.  The syntax is based on "what should be obvious"...
> 
> [a b c] = [x y z] maps all of a group of signals to a group of pins, 1:1
> 
> a = [x y z] maps one signal to a group of pins, one-to-many
> 
> [a b c] = x doesn't make sense (or at least isn't obvious), so is not
> allowed.
> 
> 
> [a b] = [x y z] is not allowed, because it's not obvious what you mean,
> but... [a b] = [[x y] z] is allowed.  a-> both x and y, and b->z, as
> is... [a b] = [(x y) z] is allowed.  a-> either x or y, and b->z.
> 
> a = (x y z) maps a signal to one of a group of pins, one-to-one
> 
> [a b y] = ([1 2 3] [4 5 6] [7 8 9]) maps all of a group of signals to
> 	all of one group of pins, chosen from a list of groups.
> 
> a = ([1 2 3] [4 5 6] [7 8 9]) maps one signals to all of one group of
> 	pins, chosen from a list of groups.
> 
> So () means "use one of" and [] means "use all of"

Hmm. If I replace "maps to" by "matches" this sounds a lot like a subset 
of regular expressions. Why not adopt regexp to this task?

Advantages are obvious: 

* No need to invent/implement/document/learn yet another syntax 

* Can deal with more complexity than a signal to pin mapping will ever 
need. 

* There is time-tested parsing code ready to grab for various languages

Just a thought...

---<(kaimartin)>---
-- 
Kai-Martin Knaak                                  tel: +49-511-762-2895
Universität Hannover, Inst. für Quantenoptik      fax: +49-511-762-2211	
Welfengarten 1, 30167 Hannover           http://www.iqo.uni-hannover.de
GPG key:    http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get



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