Choice of processor

[Philip Taylor]

On 05/03/2025 12:54, Joseph Wright wrote:
>
> That's a typo: Hans has swapped over \saveimageresource and
> \useimageresource - it happens.
>
Do you think that the same happened here, Joseph ?  As written, this 
stretch of text appears to make no sense —

> LuaTEX accepts optional dimension parameters for \use...resource in 
> the same format as for
> rules. With images, these dimensions are then used instead of the ones 
> given to \useimageresource

> No, neither XeTeX nor LuaTeX have formal definitions in the same way TeX
> does - the LuaTeX manual is more like most other programming references
> I'm familiar with, it has some gaps.

For obvious reasons I have no idea with which programming languages 
(other than TeX) you are most familiar, but as one who cut his 
programming teeth on Algol-68, I for one am a great believer in 
programming languages having a well-documented formal syntax.  When 
Peter Breitenlohner re-wrote 
<https://www.google.co.uk/url?sa=t&source=web&rct=j&opi=89978449&url=https://ctan.math.washington.edu/tex-archive/systems/doc/etex/etex_man.pdf> 
my original version of the e-TeX manual 
<https://mirror.gutenberg-asso.fr/tex.loria.fr/moteurs/etex_ref.html>, 
he added formal syntax definitions, and while I still prefer my version 
from some perspectives, his addition of formal syntax definitions was, I 
believe, a very significant improvement.  And it therefore goes without 
saying that I believe that the LuaTeX manual would similarly benefit 
from such inclusion.

-- 
/** Phil./

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