source file of the GNU LilyPond music typesetter
- (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>,
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>,
Erik Sandberg <mandolaerik@gmail.com>
*/
#include "output-def.hh"
#include "performer-group.hh"
#include "scm-hash.hh"
-#include "stream-event.hh"
#include "warn.hh"
-Translator_group *
-Translator_group::get_daddy_translator () const
-{
- return context ()->get_parent_context ()->implementation ();
-}
void
translator_each (SCM list, Translator_method method)
Translator_group::connect_to_context (Context *c)
{
if (context_)
- programming_error ("translator group is 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 (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 ()
{
- context_->event_source ()->remove_listener (GET_LISTENER (eat_event),
- ly_symbol2scm ("MusicEvent"));
+ 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 (create_child_translator),
ly_symbol2scm ("AnnounceNewContext"));
context_ = 0;
+ protected_events_ = SCM_EOL;
}
void
{
}
-bool
-translator_accepts_any_of (Translator *tr, SCM ifaces)
-{
- SCM ack_ifs = scm_assoc (ly_symbol2scm ("events-accepted"),
- tr->translator_description ());
- ack_ifs = scm_cdr (ack_ifs);
- for (SCM s = ifaces; scm_is_pair (s); s = scm_cdr (s))
- if (scm_c_memq (scm_car (s), ack_ifs) != SCM_BOOL_F)
- return true;
- return false;
-}
-
-SCM
-find_accept_translators (SCM gravlist, SCM ifaces)
-{
- SCM l = SCM_EOL;
- for (SCM s = gravlist; scm_is_pair (s); s = scm_cdr (s))
- {
- Translator *tr = unsmob_translator (scm_car (s));
- if (translator_accepts_any_of (tr, ifaces))
- l = scm_cons (tr->self_scm (), l);
- }
- l = scm_reverse_x (l, SCM_EOL);
-
- return l;
-}
-
SCM
filter_performers (SCM ell)
{
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.
{
Translator *type = get_translator (scm_car (s));
if (!type)
- warning (_f ("can't find: `%s'", ly_symbol2string (scm_car (s)).c_str ()));
+ warning (_f ("cannot find: `%s'", ly_symbol2string (scm_car (s)).c_str ()));
else
{
Translator *tr = type->clone ();
}
}
- g->simple_trans_list_ = trans_list;
-
/* Filter unwanted translator types. Required to make
\with {\consists "..."} work. */
if (dynamic_cast<Engraver_group *> (g))
- g->simple_trans_list_ = filter_performers (g->simple_trans_list_);
+ g->simple_trans_list_ = filter_performers (trans_list);
else if (dynamic_cast<Performer_group *> (g))
- g->simple_trans_list_ = filter_engravers (g->simple_trans_list_);
+ g->simple_trans_list_ = filter_engravers (trans_list);
// TODO: scrap Context::implementation
new_context->implementation_ = g;
DOWN);
}
-IMPLEMENT_LISTENER (Translator_group, eat_event);
-void
-Translator_group::eat_event (SCM sev)
-{
- Stream_event *ev = unsmob_stream_event (sev);
- SCM sm = ev->get_property ("music");
- Music *m = unsmob_music (sm);
- try_music (m);
-}
-
-bool
-Translator_group::try_music (Music *m)
-{
- SCM name = scm_sloppy_assq (ly_symbol2scm ("name"),
- m->get_property_alist (false));
-
- if (!scm_is_pair (name))
- return false;
-
- name = scm_cdr (name);
- SCM accept_list = scm_hashq_ref (accept_hash_table_, name, SCM_UNDEFINED);
- if (accept_list == SCM_BOOL_F)
- {
- accept_list = find_accept_translators (get_simple_trans_list (),
- m->get_property ("types"));
- scm_hashq_set_x (accept_hash_table_, name, accept_list);
- }
-
- for (SCM p = accept_list; scm_is_pair (p); p = scm_cdr (p))
- {
- Translator *t = unsmob_translator (scm_car (p));
- 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);
- else
- // We have tried all possible contexts. Give up.
- m->origin ()->warning (_f ("junking event: `%s'", m->name ()));
- return false;
-}
-
SCM
Translator_group::get_simple_trans_list ()
{
Translator_group *tg
= dynamic_cast<Translator_group *> (c->implementation ());
- if (dir == DOWN)
+ if (tg && dir == DOWN)
{
tg->precomputed_translator_foreach (idx);
tg->call_precomputed_self_method (idx);
s = scm_cdr (s))
precomputed_recurse_over_translators (unsmob_context (scm_car (s)), idx, dir);
- if (dir == UP)
+ if (tg && dir == UP)
{
tg->precomputed_translator_foreach (idx);
tg->call_precomputed_self_method (idx);
}
void
-recurse_over_translators (Context *c, Translator_method ptr, Translator_group_method tg_ptr, Direction dir)
+recurse_over_translators (Context *c, Translator_method ptr,
+ Translator_group_method tg_ptr, Direction dir)
{
Translator_group *tg
= dynamic_cast<Translator_group *> (c->implementation ());
- if (dir == DOWN)
+ if (tg && dir == DOWN)
{
(tg->*tg_ptr) ();
translator_each (tg->get_simple_trans_list (), ptr);
s = scm_cdr (s))
recurse_over_translators (unsmob_context (scm_car (s)), ptr, tg_ptr, dir);
- if (dir == UP)
+ if (tg && dir == UP)
{
translator_each (tg->get_simple_trans_list (),
ptr);
Translator_group::Translator_group ()
{
simple_trans_list_ = SCM_EOL;
- accept_hash_table_ = SCM_EOL;
+ protected_events_ = SCM_EOL;
context_ = 0;
smobify_self ();
-
- accept_hash_table_ = scm_c_make_hash_table (19);
}
void
Translator_group *me = (Translator_group *)SCM_CELL_WORD_1 (smob);
me->derived_mark ();
- scm_gc_mark (me->accept_hash_table_);
+ scm_gc_mark (me->protected_events_);
return me->simple_trans_list_;
}
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