Re: lpeg substitution

["Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>]

On Aug 12, 2009, at 10:32 AM, Hans Hagen wrote:

>>> if there is more demand for that i can consider making a  
>>> substituter that operates on the node list in an early stage; that  
>>> way it is controlled by attributes and there is no interference  
>>> with macro definitions, reading modules and such
>> Macro interaction may be an issue, but I believe it is still better
>> for transliterations to work on the actual input strings or on  
>> tokens.
>> For example, you may want to run macros (like \delimitedtext) on the
>> converted output.
>
> my main concern with that is that one then needs to control  
> precisely where to apply such translations; for instance turning a<  
> into something   else might also mess up math and adding all kind of  
> extra checking and housekeeping (for instance when loading modules  
> or whatever in the middle of such a conversion)
>
> of course when the to be converted fragments are tagged it's trivial  
> to use lpeg and avoid \cs's
>
> btw, i think that delimitedtext would work anyway as we only replace  
> "glyph a glyph<" by something else then
>
> anyway, it all depends on the task and hopefully unicode will solve  
> all our problems (and not introduce more)

Well, in my case the fragments are already delimited, so it's  
relatively easy. However, I wonder whether there are many applications  
for this. I don't see too many, but maybe I'm wrong. From my POV,  
there is no need for this in the core, but maybe others see more usage.

Thomas
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