if (scm_is_symbol (sym))
{
SCM val = ev->get_property ("value");
+
+ if (SCM_UNBNDP (val)) {
+ unset_property (sym);
+ return;
+ }
+
bool ok = true;
if (val != SCM_EOL)
ok = type_check_assignment (sym, val, ly_symbol2scm ("translation-type?"));
SCM
ly_quote_scm (SCM s)
{
- return scm_list_n (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
+ return scm_list_2 (ly_symbol2scm ("quote"), s);
}
string
{
Context *o = get_outlet ();
Music *m = get_music ();
- SCM previous_value = o->get_property (m->get_property ("symbol"));
+ bool once = to_boolean (m->get_property ("once"));
+ SCM symbol = m->get_property ("symbol");
+ SCM previous_value = SCM_UNDEFINED;
+ if (once) {
+ Context *w = o->where_defined (symbol, &previous_value);
+ if (o != w)
+ previous_value = SCM_UNDEFINED;
+ }
send_stream_event (o, "SetProperty", m->origin (),
- ly_symbol2scm ("symbol"), m->get_property ("symbol"),
+ ly_symbol2scm ("symbol"), symbol,
ly_symbol2scm ("value"), m->get_property ("value"));
/* For \once \set install a finalization hook to reset the property to the
* previous value after the timestep */
- if (to_boolean (m->get_property ("once")))
+ if (once)
{
Global_context *tg = get_outlet ()->get_global_context ();
tg->add_finalization (scm_list_n (once_finalization_proc,