[tex-hyphen] String preparation

[Petr Sojka]

On Thu, May 26, 2016 at 09:05:37PM +0100, Arthur Reutenauer wrote:
> >> \savinghyphcodes
> > 
> > Interesting, where is it documented?

in etex_man.pdf, e.g. `texdoc etex`, section 3.10
 
>   No idea, I think it comes from eTeX ultimately.  I never looked into
> it myself, but it gets mentioned from time to time (most recently on
> this list by Petr Sojka a few weeks ago).

the idea behind \savinghyphcodes is that character
equivalence settings for given language expressed
by \lccode mappings are saved and frozen in the
format file.

best,
Petr
 
> > How do you foresee an implementation for this? This has to be in the
> > engine right?
> 
>   I haven???t given the implementation serious thought, but it has to be
> in the engine, yes.  As mentioned, we could have two additional
> primitives \left and \rightgraphemehyphenmin, or (better in my opinion)
> a primitive \usehyphenminsongraphemes (or whatever) that changes the
> interpretation of \left and \righthyphenmin.  But this is such a
> specialised use case that I don???t think it???s worth the bother.  The
> differences are either minimal, or the languages for which they are
> important use very simple hyphenation (this may change in the future, of
> course).
> 
> 	Best,
> 
> 		Arthur