[NTG-context] Minor bug in Lua or ConTeXt

Hans Hagen j.hagen at xs4all.nl
Wed Jan 18 19:07:16 CET 2023

On 1/18/2023 6:47 PM, Pablo Rodriguez via ntg-context wrote:

> from what I understand is that undefined TeX commands cannot be added to
> Lua comments.

Indeed. Of course we could have some 'ignore undefined command' feature 
but that cripples the engine as well as then also never gives warning in 
the case you *do* want to expand.

> If I’m not wrong (in my previous statement), I think this is
> counterintuitive, since undefined commands are fine in TeX comments and
> undefined variables are fine inside \startluacode … \stopluacode.
I bet you'd complain if \the\scratchdimen would not expand. You cannot 
expect context to completely parse what goes into lua beforehand, unless 
you are willing to get a performance hit (apart from a waste of time).

And even if we'd make e.g. - active (with some lookahead magick) and 
then gobble till the end of the line we would get questions why it 
doesn't work in macros.

It's a small price to pay. (I also bet that Bruce is willing to \relax 
the command.)

Thanks for adding to the wiki,


                                           Hans Hagen | PRAGMA ADE
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