virtual void process (Moment);
private:
SCM split_list_;
- Direction where_dir_;
};
void
Auto_change_iterator::process (Moment m)
{
- // TODO: It seems strange that this occurs before consulting the split list.
- Music_wrapper_iterator::process (m);
-
Moment *splitm = 0;
for (; scm_is_pair (split_list_); split_list_ = scm_cdr (split_list_))
if (*splitm > m)
break;
- SCM tag = scm_cdar (split_list_);
- Direction d = to_dir (tag);
-
- if (d && d != where_dir_)
- {
- // TODO: The function of where_dir_ in choosing the direction should
- // be built into split-list generation so that this iterator merely
- // effects a sequence of context changes.
- where_dir_ = d;
- string to_id = (d >= 0) ? "up" : "down";
- // N.B. change_to() returns an error message. Silence is the legacy
- // behavior here, but maybe that should be changed.
- Change_iterator::change_to (*child_iter_,
- ly_symbol2scm ("Staff"),
- to_id);
- }
+ // N.B. change_to() returns an error message. Silence is the legacy
+ // behavior here, but maybe that should be changed.
+ Change_iterator::change_to (*child_iter_,
+ ly_symbol2scm ("Staff"),
+ ly_scm2string (scm_cdar (split_list_)));
}
+
+ Music_wrapper_iterator::process (m);
}
Auto_change_iterator::Auto_change_iterator ()
{
- where_dir_ = CENTER;
split_list_ = SCM_EOL;
}
;; autochange.scm - fairly related to part combining.
(define-public (make-autochange-music music)
- (define (generate-split-list change-moment event-list acc)
+ (define (generate-split-list change-moment prev-dir event-list acc)
(if (null? event-list)
acc
(let* ((now-tun (caar event-list))
evs))
(pitch (if (pair? notes)
(ly:event-property (car notes) 'pitch)
- #f)))
+ #f))
+ (dir (if pitch (sign (ly:pitch-steps pitch)) 0)))
;; tail recursive.
- (if (and pitch (not (= (ly:pitch-steps pitch) 0)))
+ (if (and (not (= dir 0))
+ (not (= dir prev-dir)))
(generate-split-list #f
+ dir
(cdr event-list)
(cons (cons
(if change-moment
change-moment
now)
- (sign (ly:pitch-steps pitch))) acc))
+ (if (< dir 0) "down" "up")) acc))
(generate-split-list
(if pitch #f now)
+ dir
(cdr event-list) acc)))))
(let* ((m (make-music 'AutoChangeMusic))
(rev (reverse! (cdar context-list)))
(split (reverse! (generate-split-list
#f
+ 0
rev
'())
'())))