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

[David Kastrup]

Urs Liska <address@hidden> writes:

> 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?

Sure.

> But I have to get to that context in process-acknowledged or
> stop-translation-timestep.

So store it until then.

> 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.

So?  How many millions per time step do you expect?

-- 
David Kastrup