+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));
+ }
+}
+
+
+SCM list_p = 0;
+
+/*
+ This is a rather crude check: we merely check if the translator
+ property is a list.
+ */
+bool
+check_grob (Music *mus, SCM sym)
+{
+ if (!list_p)
+ {
+ list_p = scm_c_eval_string ("list?");
+ }
+
+
+ SCM type = scm_object_property (sym, ly_symbol2scm ("translation-type?"));
+ bool ok = type == list_p;
+
+ if (!ok)
+ {
+ mus->origin ()->warning (_f ("Not a grob name, `%s'." , ly_symbol2string (sym)));
+ }
+ return ok;
+}
+
+void
+Push_property_iterator::process (Moment m)
+{
+ SCM sym = get_music ()->get_property ("symbol");
+ if (check_grob (get_music (), sym))
+ {
+ SCM eprop = get_music ()->get_property ("grob-property");
+ SCM val = get_music ()->get_property ("grob-value");
+
+ if (to_boolean (get_music ()->get_property ("pop-first"))
+ && !to_boolean (get_music ()->get_property ("once")))
+ execute_pushpop_property (get_outlet (), sym, eprop, SCM_UNDEFINED);
+
+ execute_pushpop_property (get_outlet (), sym, eprop, val);
+ }
+ Simple_music_iterator::process (m);
+}
+
+MAKE_SCHEME_CALLBACK (Push_property_iterator,once_finalization, 2);
+SCM
+Push_property_iterator::once_finalization (SCM trans, SCM music)
+{
+ Music * mus = unsmob_music (music);
+ Context * tg = dynamic_cast<Context *> (unsmob_context (trans));
+
+ SCM sym = mus->get_property ("symbol");
+ if (check_grob (mus, sym))
+ {
+ SCM eprop = mus->get_property ("grob-property");
+
+ execute_pushpop_property (tg, sym, eprop, SCM_UNDEFINED);
+ }
+ return SCM_UNSPECIFIED;
+}
+
+void
+Push_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));
+ }
+}
+
+void
+Pop_property_iterator::process (Moment m)
+{
+ SCM sym = get_music ()->get_property ("symbol");
+
+ if (check_grob (get_music (), sym))
+ {
+ SCM eprop = get_music ()->get_property ("grob-property");
+execute_pushpop_property (get_outlet (), sym, eprop, SCM_UNDEFINED);
+ }
+ Simple_music_iterator::process (m);
+}
+
+
+
+IMPLEMENT_CTOR_CALLBACK (Pop_property_iterator);
+IMPLEMENT_CTOR_CALLBACK (Push_property_iterator);
+IMPLEMENT_CTOR_CALLBACK (Property_iterator);
+IMPLEMENT_CTOR_CALLBACK (Property_unset_iterator);
+