[Xotcl] Even more [eval] woes

Kristoffer Lawson setok at fishpool.com
Tue Sep 14 15:36:35 CEST 2004

On Tue, 14 Sep 2004, Gustaf Neumann wrote:

>> In practise this is now causing so many headaches I think I'm going to
>> give up on doing this package using XOTcl that way. There appears to be no
>> (working?) way to run a script within the 'context' of an object, in order
>> to easily parse data which is formed in the style of a Tcl script. This is
>> unfortunate as it would likely have offered clear performance benefits.
> If you have some some code, we can look at, we will certainly
> try to help with that.

I'm actually working on a package built on top of normal [binary] which
would allow a clearer definition of the format of the binary data. 
Something like:

byenary::scan $data {
     option endian little
     type cellObject {
 	short objID
 	int8 triByteNum

 	int8 $triByteNum triVisibility

     format {
 	object root {
 	    short objNum
 	    short triNum

 	    cellObject $objNum objects

 	object * children {
 	    short objID
 	    short objNum
 	    short triNum

 	    cellObject $objNum objects

The aim is then that it returns a hierarchy of objects to represent the 
data. I actually made a version already, but it parses that format 
description manually and continuously. Even if I split the script into 
lists, I still have to go through that. The format description is 
intentionally made to look like a Tcl script with the idea that later I 
could evaluate it in the appropriate context and let Tcl do the work (and 
also byte compile it).

Now I'm thinking about doing that not by XOTcl mechanisms but namespaces. 
Perhaps that could be the best option.

                               / http://www.fishpool.com/~setok/

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