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StringNumberEvents [was: Re: How to evaluate 'articulations entries?}

From: Marc Hohl
Subject: StringNumberEvents [was: Re: How to evaluate 'articulations entries?}
Date: Thu, 01 Sep 2011 16:14:53 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110805 Thunderbird/3.1.12

Am 01.09.2011 10:02, schrieb Marc Hohl:

I noticed that

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

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.
Meanwhile, I found out that the string-number-interface isn't used in this case, so
I searched in the sources and found that I had to use string-number-events
instead, which are addressed to by listeners, IIUC.

So I wrote a simple test case:
\version "2.15.9"

#(define-public (test_string_engraver context)
  (let ((stringnumbers '()))
  `(;; the list of listeners
      (string-number-event .
        ,(lambda (engraver event)
           (set! stringnumbers (cons event stringnumbers)))))
       ;; once the acknowledging stage has finished,
       ;; process the grobs we've found
      . ,(lambda (trans)
           (for-each (lambda (strnum)
(let* ((stringnum (ly:event-property strnum 'string-number)))

                     (display "We have  a string-number-event: ")
                     (display stringnum)
                    (display " \n"))
             ) ;; end lambda (strnum)
      . ,(lambda (trans)
                 (set! stringnumbers '()))))))

\layout {
  \context {
    \consists \test_string_engraver

test = \relative c'{
  c4\4 < e\2 >
%\displayMusic { \test }
\new Voice { \test }

So I think I am on the right track for now, but any hints, optimizations etc.
are highly welcome!


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