+/*
+ Create a new translator for a newly created child context. Triggered
+ by AnnounceNewContext events.
+ */
+IMPLEMENT_LISTENER (Translator_group, create_child_translator);
+void
+Translator_group::create_child_translator (SCM sev)
+{
+ Stream_event *ev = unsmob_stream_event (sev);
+ // get from AnnounceNewContext
+ SCM cs = ev->get_property ("context");
+ Context *new_context = unsmob_context (cs);
+ Context_def *def = unsmob_context_def (new_context->get_definition ());
+ SCM ops = new_context->get_definition_mods ();
+
+ SCM trans_names = def->get_translator_names (ops);
+
+ Translator_group *g = get_translator_group (def->get_translator_group_type ());
+ SCM trans_list = SCM_EOL;
+
+ for (SCM s = trans_names; scm_is_pair (s); s = scm_cdr (s))
+ {
+ SCM definition = scm_car (s);
+ bool is_scheme = false;
+
+ Translator *type = 0;
+ if (ly_is_symbol (definition))
+ type = get_translator (definition);
+ else if (ly_is_pair (definition))
+ {
+ type = get_translator (ly_symbol2scm ("Scheme_engraver"));
+ is_scheme = true;
+ }
+ else if (ly_is_procedure (definition))
+ {
+ // `definition' is a procedure, which takes the context as
+ // an argument and evaluates to an a-list scheme engraver
+ // definition.
+ definition = scm_call_1 (definition, cs);
+ type = get_translator (ly_symbol2scm ("Scheme_engraver"));
+ is_scheme = true;
+ }
+
+ if (!type)
+ warning (_f ("cannot find: `%s'", ly_symbol2string (scm_car (s)).c_str ()));
+ else
+ {
+ Translator *instance = type->clone ();
+ if (is_scheme)
+ dynamic_cast<Scheme_engraver *> (instance)->init_from_scheme (definition);
+
+ SCM str = instance->self_scm ();
+
+ if (instance->must_be_last ())
+ {
+ SCM cons = scm_cons (str, SCM_EOL);
+ if (scm_is_pair (trans_list))
+ scm_set_cdr_x (scm_last_pair (trans_list), cons);
+ else
+ trans_list = cons;
+ }
+ else
+ trans_list = scm_cons (str, trans_list);
+
+ instance->daddy_context_ = new_context;
+ instance->unprotect ();
+ }
+ }
+
+ /* Filter unwanted translator types. Required to make
+ \with { \consists "..." } work. */
+ if (dynamic_cast<Engraver_group *> (g))
+ g->simple_trans_list_ = filter_performers (trans_list);
+ else if (dynamic_cast<Performer_group *> (g))
+ g->simple_trans_list_ = filter_engravers (trans_list);
+
+ // TODO: scrap Context::implementation
+ new_context->implementation_ = g;
+
+ g->connect_to_context (new_context);
+ g->unprotect ();
+
+ recurse_over_translators (new_context,
+ &Translator::initialize,
+ &Translator_group::initialize,
+ DOWN);
+}