#include "context-def.hh"
#include "context.hh"
#include "dispatcher.hh"
+#include "engraver-group.hh"
+#include "international.hh"
#include "main.hh"
#include "music.hh"
#include "output-def.hh"
+#include "performer-group.hh"
#include "scm-hash.hh"
#include "stream-event.hh"
#include "warn.hh"
Translator_group::connect_to_context (Context *c)
{
if (context_)
- programming_error ("already connected to a context");
+ {
+ programming_error ("translator group is already connected to context "
+ + context_->context_name ());
+ }
+
context_ = c;
- c->event_source ()->add_listener (GET_LISTENER (eat_event), ly_symbol2scm ("MusicEvent"));
+ c->event_source ()->add_listener (GET_LISTENER (eat_event),
+ ly_symbol2scm ("OldMusicEvent"));
+ c->event_source ()->add_listener (GET_LISTENER (create_child_translator),
+ ly_symbol2scm ("AnnounceNewContext"));
+ for (SCM tr_list = simple_trans_list_; scm_is_pair (tr_list); tr_list = scm_cdr (tr_list))
+ {
+ Translator *tr = unsmob_translator (scm_car (tr_list));
+ tr->connect_to_context (c);
+ }
+}
+
+void
+Translator_group::disconnect_from_context ()
+{
+ for (SCM tr_list = simple_trans_list_; scm_is_pair (tr_list); tr_list = scm_cdr (tr_list))
+ {
+ Translator *tr = unsmob_translator (scm_car (tr_list));
+ tr->disconnect_from_context (context_);
+ }
+ context_->event_source ()->remove_listener (GET_LISTENER (eat_event),
+ ly_symbol2scm ("OldMusicEvent"));
+ context_->event_source ()->remove_listener (GET_LISTENER (create_child_translator),
+ ly_symbol2scm ("AnnounceNewContext"));
+ context_ = 0;
+ protected_events_ = SCM_EOL;
}
void
return l;
}
+SCM
+filter_performers (SCM ell)
+{
+ SCM *tail = ℓ
+ for (SCM p = ell; scm_is_pair (p); p = scm_cdr (p))
+ {
+ if (dynamic_cast<Performer *> (unsmob_translator (scm_car (*tail))))
+ *tail = scm_cdr (*tail);
+ else
+ tail = SCM_CDRLOC (*tail);
+ }
+ return ell;
+}
+
+SCM
+filter_engravers (SCM ell)
+{
+ SCM *tail = ℓ
+ for (SCM p = ell; scm_is_pair (p); p = scm_cdr (p))
+ {
+ if (dynamic_cast<Engraver *> (unsmob_translator (scm_car (*tail))))
+ *tail = scm_cdr (*tail);
+ else
+ tail = SCM_CDRLOC (*tail);
+ }
+ return ell;
+}
+
+/*
+ Protects the parameter from being garbage collected. The object is
+ protected until the next disconnect_from_context call.
+
+ Whenever a child translator hears an event, the event is added to
+ this list. This eliminates the need for derived_mark methods in most
+ translators; all incoming events are instead protected by the
+ translator group.
+
+ TODO: Should the list also be flushed at the beginning of each new
+ moment?
+ */
+void
+Translator_group::protect_event (SCM ev)
+{
+ protected_events_ = scm_cons (ev, protected_events_);
+}
+
+/*
+ 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))
+ {
+ Translator *type = get_translator (scm_car (s));
+ if (!type)
+ warning (_f ("can't find: `%s'", ly_symbol2string (scm_car (s)).c_str ()));
+ else
+ {
+ Translator *tr = type->clone ();
+ SCM str = tr->self_scm ();
+
+ if (tr->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);
+
+ tr->daddy_context_ = new_context;
+ tr->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);
+}
+
IMPLEMENT_LISTENER (Translator_group, eat_event);
void
Translator_group::eat_event (SCM sev)
if (t && t->try_music (m))
return true;
}
+
+ // We couldn't swallow the event in this context. Try parent.
+ Context *p = context ()->get_parent_context ();
+ // Global context's translator group is a dummy, so don't try it.
+ if (p->get_parent_context())
+ // ES todo: Make Translators listeners directly instead.
+ return p->implementation ()->try_music (m);
+ // 'junking event' warning is temporarily disabled during translator cleanup
+ /*
+ else
+ // We have tried all possible contexts. Give up.
+ m->origin ()->warning (_f ("junking event: `%s'", m->name ()));
+ */
return false;
}
{
simple_trans_list_ = SCM_EOL;
accept_hash_table_ = SCM_EOL;
+ protected_events_ = SCM_EOL;
context_ = 0;
smobify_self ();
me->derived_mark ();
scm_gc_mark (me->accept_hash_table_);
+ scm_gc_mark (me->protected_events_);
return me->simple_trans_list_;
}
projects / lilypond.git / blobdiff