Re: How to evaluate 'articulations entries?

[Marc Hohl]

Am 30.08.2011 08:23, schrieb Marc Hohl:
> Am 29.08.2011 18:52, schrieb Reinhold Kainhofer:
> > Am Montag, 29. August 2011, 18:07:17 schrieb Marc Hohl:
> > > Hello list,
> > >
> > > I think I have asked a similar question long time ago, but I didn't
> > > find the answer.
> > >
> > > Currently, I am working on a little scheme engraver which should 
> > > read the
> > > 'string-number, if given, and should do some calculations, depending on
> > > other articulations, like 'HarmonicEvent.
> > The articulations are a list, so you have to filter them to get the 
> > actual
> > string numbers.
> > Example attached,
> > Reinhold
> Thank you, Neil, David and Reinhold, for your hints and examples!
> Work like a charm!
Umm, well, not quite yet.


I noticed that

a)
I can detect string numbers within < ... > only, so
< c\3 > is recognized, d\4 not, but I need to cover *both* cases.

So I looked at the output of \displayMusic { c\4 }:

(make-music
  'SequentialMusic
  'elements
  (list (make-music
          'EventChord
          'elements
          (list (make-music
                  'NoteEvent
                  'duration
                  (ly:make-duration 2 0 1 1)
                  'pitch
                  (ly:make-pitch -1 0 0))
                (make-music
                  'StringNumberEvent
                  'string-number
                  4)))))

Ok, so \4 isn't an articulation (which is obvious, but I had overlooked it).
AFAIK, the string-number won't be accessible in this case, so I tried to
acknowledge the string-number-interface, too.

For sake of simplicity, I staggered two for-each loops and am now able 
to detect
string-numbers with this approach (note: the displayed information is 
partly wrong
due to the loop construct), but still I can't access the first two notes 
which aren't
surrounded by <...>. What am I doing wrong?

b)
Even in the first approach sent by Reinhold, the information about the
note heads is displayed *twice* for each note head - why?

Regards,

Marc
> Regards,
>
> Marc
>
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string-number2.ly
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