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Re: [GSoC] spanners project update

From: Dan Eble
Subject: Re: [GSoC] spanners project update
Date: Fri, 24 Jun 2016 08:28:44 -0400

> On Jun 24, 2016, at 07:41 , Nathan Chou <address@hidden> wrote:
> Hello,
> spanners with an id are handled as potentially being cross-voice. Each
> engraver maintains a static list member (so it is shared between all
> instances of an engraver) of named spanners and the voice each spanner
> currently belongs to.


First, thanks for attacking this problem.

Using a static member sounds like a convenient way to ramp up your work, but 
limiting in the number of ways it can be used and maintained.  As soon as one 
tries to use this feature in a case in which there are concurrent but unrelated 
instances of those engravers, side effects not expected by the user will begin 
to appear.

For the best solution, let your mentor advise you, but I suspect that the most 
Lilypondish way would be to store your index as a property in the nearest 
context that encloses all the voices you might want to span.

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