source file of the GNU LilyPond music typesetter
- (c) 1997--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
#include "translator.hh"
-#include "warn.hh"
-#include "translator-group.hh"
#include "context-def.hh"
+#include "dispatcher.hh"
#include "global-context.hh"
+#include "international.hh"
+#include "translator-group.hh"
+#include "warn.hh"
#include "translator.icc"
#include "ly-smobs.icc"
must_be_last_ = src.must_be_last_;
}
-bool
-Translator::try_music (Music *)
-{
- return false;
-}
-
Moment
Translator::now_mom () const
{
return daddy_context_->implementation ();
}
+void
+Translator::protect_event (SCM ev)
+{
+ get_daddy_translator ()->protect_event (ev);
+}
+
SCM
Translator::internal_get_property (SCM sym) const
{
}
/*
- this function has 2 properties
-
- - It is called before try_music ()
-
- - It is called before any user information enters the translators.
- (i.e. any \property or event is not processed yet.)
+ this function is called once each moment, before any user
+ information enters the translators. (i.e. no \property or event has
+ been processed yet.)
*/
void
Translator::start_translation_timestep ()
{
}
+void
+Translator::connect_to_context (Context *c)
+{
+ for (translator_listener_record *r = get_listener_list (); r; r=r->next_)
+ c->events_below ()->add_listener (r->get_listener_ (this), r->event_class_);
+}
+
+void
+Translator::disconnect_from_context (Context *c)
+{
+ for (translator_listener_record *r = get_listener_list (); r; r=r->next_)
+ c->events_below ()->remove_listener (r->get_listener_ (this), r->event_class_);
+}
+
+static SCM listened_event_class_table;
+void
+ensure_listened_hash ()
+{
+ if (!listened_event_class_table)
+ listened_event_class_table = scm_permanent_object (scm_c_make_hash_table (61));
+}
+
+
+LY_DEFINE (ly_get_listened_event_classes, "ly:get-listened-event-classes",
+ 0, 0, 0, (),
+ "Returns a list of all event classes that some translator listens to.")
+{
+ ensure_listened_hash ();
+ return ly_hash_table_keys (listened_event_class_table);
+}
+
+LY_DEFINE (ly_is_listened_event_class, "ly:is-listened-event-class",
+ 1, 0, 0, (SCM sym),
+ "Is @var{sym} a listened event class?")
+{
+ ensure_listened_hash ();
+ return scm_hashq_ref (listened_event_class_table, sym, SCM_BOOL_F);
+}
+
+void
+add_listened_event_class (SCM sym)
+{
+ ensure_listened_hash ();
+
+ scm_hashq_set_x (listened_event_class_table, sym, SCM_BOOL_T);
+}
+
+
+/*
+ internally called once, statically, for each translator
+ listener. Connects the name of an event class with a procedure that
+ fetches the corresponding listener.
+
+ The method should only be called from the macro
+ IMPLEMENT_TRANSLATOR_LISTENER.
+ */
+void
+Translator::add_translator_listener (translator_listener_record **listener_list,
+ translator_listener_record *r,
+ Listener (*get_listener) (void *),
+ const char *ev_class)
+{
+ /* ev_class is the C++ identifier name. Convert to scm symbol */
+ string name = string (ev_class);
+ name = replace_all (name, '_', '-');
+ name += "-event";
+
+ SCM class_sym = scm_str2symbol (name.c_str ());
+
+ add_listened_event_class (class_sym);
+ r->event_class_ = class_sym;
+ r->get_listener_ = get_listener;
+ r->next_ = *listener_list;
+ *listener_list = r;
+}
+
/*
SMOBS
*/
return daddy_context_->get_global_context ();
}
-Score_context *
+Context *
Translator::get_score_context () const
{
return daddy_context_->get_score_context ();
void
add_acknowledger (Engraver_void_function_engraver_grob_info ptr,
char const *func_name,
-
Array<Acknowledge_information> *ack_array)
+
vector<Acknowledge_information> *ack_array)
{
Acknowledge_information inf;
inf.function_ = ptr;
- String interface_name (func_name);
+ string interface_name (func_name);
- interface_name = interface_name.substitute ('_', '-');
+ interface_name = replace_all (interface_name, '_', '-');
interface_name += "-interface";
- inf.symbol_ = scm_gc_protect_object (ly_symbol2scm (interface_name.to_str0 ()));
- ack_array->push (inf);
+ /*
+ this is only called during program init, so safe to use scm_gc_protect_object()
+ */
+ inf.symbol_ = scm_gc_protect_object (ly_symbol2scm (interface_name.c_str ()));
+ ack_array->push_back (inf);
}
Engraver_void_function_engraver_grob_info
-generic_get_acknowledger (SCM sym,
Array<Acknowledge_information> const *ack_array)
+generic_get_acknowledger (SCM sym,
vector<Acknowledge_information> const *ack_array)
{
- for (int i = 0; i < ack_array->size (); i++)
+ for (vsize i = 0; i < ack_array->size (); i++)
{
- if (ack_array->elem (i).symbol_ == sym)
- return ack_array->elem (i).function_;
+ if (ack_array->at (i).symbol_ == sym)
+ return ack_array->at (i).function_;
}
return 0;
}
+Moment
+get_event_length (Stream_event *e)
+{
+ Moment *m = unsmob_moment (e->get_property ("length"));
+ if (m)
+ return *m;
+ else
+ return Moment (0);
+}
+
+/*
+ Helper, used through ASSIGN_EVENT_ONCE to throw warnings for
+ simultaneous events. The helper is only useful in listen_* methods
+ of translators.
+*/
+bool
+internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function)
+{
+ if (*old_ev)
+ {
+ /* extract event class from function name */
+ const char *prefix = "listen_";
+ string ev_class = function;
+ /* This assertion fails if EVENT_ASSIGNMENT was called outside a
+ translator listener. Don't do that. */
+ assert (0 == ev_class.find (prefix));
+
+ /* "listen_foo_bar" -> "foo-bar" */
+ ev_class.erase (0, strlen(prefix));
+ replace_all (ev_class, '_', '-');
+
+ new_ev->origin ()->warning (_f ("Two simultaneous %s events, junking this one", ev_class.c_str ()));
+ (*old_ev)->origin ()->warning (_f ("Previous %s event here", ev_class.c_str ()));
+ return false;
+ }
+ else
+ {
+ *old_ev = new_ev;
+ return true;
+ }
+}
+
ADD_TRANSLATOR (Translator,
"Base class. Unused",
"",
projects / lilypond.git / blobdiff