+void
+Property_unset_iterator::process (Moment m)
+{
+ SCM sym = get_music ()->get_property ("symbol");
+ send_stream_event (get_outlet (), "UnsetProperty", get_music ()->origin (),
+ ly_symbol2scm ("symbol"), sym);
+
+ Simple_music_iterator::process (m);
+}
+
+MAKE_SCHEME_CALLBACK (Property_iterator, once_finalization, 2);
+SCM
+Property_iterator::once_finalization (SCM ctx, SCM music)
+{
+ Music *m = unsmob_music (music);
+ Context *c = unsmob_context (ctx);
+
+ send_stream_event (c, "UnsetProperty", m->origin (),
+ ly_symbol2scm ("symbol"), m->get_property ("symbol"));
+ return SCM_UNSPECIFIED;
+}
+
+void
+Property_iterator::do_quit ()
+{
+ if (to_boolean (get_music ()->get_property ("once")))
+ {
+ SCM trans = get_outlet ()->self_scm ();
+ SCM music = get_music ()->self_scm ();
+
+ Global_context *tg = get_outlet ()->get_global_context ();
+ tg->add_finalization (scm_list_n (once_finalization_proc,
+ trans, music, SCM_UNDEFINED));
+ }
+}
+
+bool
+check_grob (Music *mus, SCM sym)
+{
+ bool g = to_boolean (scm_object_property (sym, ly_symbol2scm ("is-grob?")));
+
+ if (!g)
+ mus->origin ()->warning (_f ("not a grob name, `%s'",
+ ly_symbol2string (sym)));
+
+ return g;
+}
+
+SCM
+get_property_path (Music *m)
+{
+ SCM grob_property_path = m->get_property ("grob-property-path");
+
+ SCM eprop = m->get_property ("grob-property");
+ if (scm_is_symbol (eprop))
+ {
+ grob_property_path = scm_list_1 (eprop);
+ }
+
+ return grob_property_path;
+}
+