Re: lpeg substitution

[Hans Hagen <pragma@wxs.nl>]

Taco Hoekwater wrote:
> Hans Hagen wrote:
>> Thomas A. Schmitz wrote:
>>>
>>> On Aug 11, 2009, at 2:35 PM, Hans Hagen wrote:
>>>
>>>> what exactly do you want to replace ?
>>>>
>>>> Hans
>>>>
>>>
>>> I'm trying to use the lpegs you have written for mtx-babel.lua, but 
>>> instead of rewriting the greek ASCII stuff to a new file, I want to 
>>> convert it to proper utf Greek and feed that to mkiv. As I said, it's 
>>> a stopgap, but better than nothing...
>>
>> 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)

Hans

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                                           Hans Hagen | PRAGMA ADE
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