[luatex] macros to invoke lua in LaTeX
Hans Hagen
pragma at wxs.nl
Thu Mar 5 17:04:26 CET 2009
Ulrike Fischer wrote:
> Am Thu, 05 Mar 2009 09:19:15 +0100 schrieb Taco Hoekwater:
>
>>> Not just right now, but at any time in the future: if a new primitive
>>> \foo is introduced, any existing package that happens to use \foo is
>>> potentially affected.
>> This is the best argument ever -- for not developing luatex at all.
>>
>> Until version luatex 1.0, we reserve the right to make any change.
>> Because if we were to promise not to remove old primitives and to
>> avoid adding conflicting primitives, you get exactly what you have
>> already: pdftex. Which isn't going away.
>
> Naturally luatex can add new primitives (and should do it) like
> pdftex has done it. And you will never be able to avoid that such a
> new primitive clash somehow. But nevertheless I think it would be
> very useful if the names of the primitives would use an uniform
> prefix -- even more as luatex is not stable and new primitives can
> arise or disappear again. Prefixes like \pdf of pdftex and \XeTeX of
> xetex create a simple namespace and enable package writers to avoid
> _future_ conflicts with new primitives simply by not using the
> prefix.
there is no such problem:
- engine starts up with \newthing defined as primitive
- macro packagesis loaded and defines \newthing itself
so, how can there be a conflict? only if other packages expect \newthing
to be the primitive which they can't because it was always a macro
now, nothing prevents a macro package core to provide \prefixednewthing
as soon as \newthing shows up in the engine
so, instead of messing around with the engine's prefix (which is not
robust either) a macro package can enforce its own policy
Hans
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