Re: Context aliases

[Han-Wen Nienhuys]

Erik Sandberg escreveu:
> On Monday 06 November 2006 17:02, Han-Wen Nienhuys wrote:
> > Erik Sandberg escreveu:
> > > > > I think this will be an improvement, because we remove the concept of
> > > > > aliases, which confuses users (at least it confuses me a bit); in
> > > > > addition we don't need to do anything extra to softcode aliases.
> > > > I don't understand. How will this work in practice?  Ie. if I do
> > > >
> > > >    \set Timing.measurePosition = #..
> > > >
> > > > how will it be processed?
> > > We will have to change that to an \applyContext which finds/creates a
> > > context with the 'timing property set, something like
> > > \findContextWithPredicate #'timing \set measurePosition = #...
> > I still don't understand why you want to scrap it.
>
> The main reason is to have one event less in the stream API (if we will keep 
> the current alias mechanism, I will have to create an add-alias stream 
> event). IWBN to keep that API minimal, and to me it seems that aliases aren't 
> much used anyways.
>
> However, you have a very point that functions like \applyoutput will get more 
> complicated if we want to keep full backward compatibility.

I wouldn't say that they are not used often. Every \override and \set 
would start use  \findContextWithPredicate. Eg. 
RhythmicStaff/RhythmicVoice  has a \context Staff / \context Voice 
alias. That doesn't strike me as a tight API.

Is it necessary to solve this problem now?

--

Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen

LilyPond Software Design
 -- Code for Music Notation
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