Re: [NTG-context] new trickery

On 3/15/2013 3:08 AM, Idris Samawi Hamid ادريس سماوي حامد wrote:

Hi Hans,

This is interesting, because I was thinking about this issue this past weak, and was planning to send a test file:

On Thu, 14 Mar 2013 17:39:50 -0600, Hans Hagen wrote:

...

There is a new experimental feature and (at least for now) it's also called \feature (maybe not the best name).

\stack might be better, for the following reason:

hm, one problem with such nice names is that they might be in use in user definitions

...

Many fonts have language dependent features. There are also features that one only wants to enable in small text snippets. For this we have \addff etc but these don't accumulate.

We used to have \addfs{<feature>} and \subfs{<feature>}, meaning "add feature to the stack" and "subtract feature from the stack". But those have been broken for a very long time.

afaik they're not broken but they don't stack up, only the last one counts (for a good technical reasons)

To round it off I guess we need a replacement for \subfs as well.

that can be done by defining the proper 'reset' features (see demo code), keep in mind that when feature switches are in macros one never really knows what is 'current' so it's already quite fuzzy; of course we can think of a negate option (i.e. use the negation of a feature set but that can be dangerous as when features inherit one doesn't want to disable kerning (for instance)

Thanks for this wonderful new feature (pun intended) and

Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------