Re: Find Voice/etc. context from Staff/etc. context

[Urs Liska]

Am 11.07.2018 um 10:33 schrieb David Kastrup:
> Urs Liska <address@hidden> writes:
>
> > One more understanding question regarding contexts and engravers.
> >
> > If I \consist an engraver in a bottom context like Voice I can travel
> > up the chain of parent contexts, retrieving their name and id
> > properties. But if I \consist it in Staff level contexts I don't see
> > if/how I can get to the bottom-level context a grob is possibly in.
> To be in any meaningful way "in a bottom-level context", a grob needs to
> be made by an engraver at bottom level.  In that case you can call
> ly:translator-context on the third argument of the grob acknowledger
> which is the _source_ engraver rather than the current engraver.

OK, I have tested how this works, and I see how I can retrieve the 
lowest context of any given grob. But if I'm not mistaken this is only 
possible in acknowledgers, isn't it? But I have to get to that context 
in process-acknowledged or stop-translation-timestep.

By now I would know how to link that information to the grob in 
acknowledgers and read it later - but that would mean I have to look up 
the source-engraver context for *all* grobs and not only for those (the 
annotated grobs) where I actually need them.