+#include "global-translator.hh"
+
+
+bool check_grob(Music *mus, SCM sym);
+
+/**
+ There is no real processing to a property: just lookup the
+ translation unit, and set the property.
+*/
+void
+Property_iterator::process (Moment m)
+{
+ SCM sym = get_music ()->get_mus_property ("symbol");
+ if (gh_symbol_p (sym))
+ {
+ SCM val = get_music ()->get_mus_property ("value");
+ bool ok= true;
+ if (val != SCM_EOL)
+ ok = type_check_assignment (sym, val, ly_symbol2scm ("translation-type?"));
+ if (ok)
+ report_to ()->internal_set_property (sym, val);
+ }
+ Simple_music_iterator::process (m);
+}
+
+void
+Property_unset_iterator::process (Moment m)
+{
+ SCM sym = get_music ()->get_mus_property ("symbol");
+ type_check_assignment (sym, SCM_EOL, ly_symbol2scm ("translation-type?"));
+ report_to ()->unset_property (sym);
+
+ Simple_music_iterator::process (m);
+}
+
+MAKE_SCHEME_CALLBACK(Property_iterator,once_finalization, 2);
+SCM
+Property_iterator::once_finalization(SCM translator, SCM music )
+{
+ Music * m = unsmob_music (music);
+ Translator_group * tg
+ = dynamic_cast<Translator_group*> (unsmob_translator (translator));
+ SCM sym = m->get_mus_property ("symbol");
+
+ tg->unset_property (sym);
+ return SCM_UNSPECIFIED;
+}
+
+void
+Property_iterator::do_quit ()
+{
+ if (to_boolean (get_music ()->get_mus_property ("once")))
+ {
+ SCM trans = report_to()->self_scm();
+ SCM music = get_music()->self_scm();
+
+ Global_translator * tg= report_to()->top_translator ();
+
+ tg->add_finalization (scm_list_n (once_finalization_proc,
+ trans, music, SCM_UNDEFINED));
+ }
+}
+
+
+SCM list_p = 0;
+
+bool
+check_grob(Music *mus, SCM sym)
+{
+ if (!list_p)
+ {
+ list_p = gh_eval_str ("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;
+}