From: Carlos <angus@...>
Date: 2005-01-27T10:23:26+09:00
Subject: Re: When little languages grow...

[Hugh Sasse Staff Elec Eng <hgs@dmu.ac.uk>, 2005-01-26 19.18 CET]
> My present example is that I want to parse Constructive Solid
> Geometry descriptions, at the moment limited to cones, spheres,
> bricks with the co-ordinates specified, and I need to specify
> material types as well.
> 
> I'd also like to be able to declare new objects so they can be
> placed.  Silly example:  Get two small spheres to cap the ends of
> a cylinder and call the result a Sausage.  Then place several
> Sausages in the space at different points.
> 
> Later I'd have to extend the language to be able to rotate them into
> psoition.  Lots of creeping featurism is likely, I suspect.  I
> didn't have material types to deal with before.

How about using POV-ray's scene description language?

Here somebody did a yacc parser for that language:
	http://www.io.com/~wwagner/pov.html
(skip to header "The Parser"). Maybe you can adapt it to use with racc.

(I don't know about the licence.)

Good luck.