X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fdispatcher-scheme.cc;h=13854b26d783fc5bde1321064831688d2a57077d;hb=cbe41403f58c9e30a1ba86d5f802b007d61748d6;hp=e467064bf417080c6d364b55cf01a22982eaf673;hpb=d2300573cae3c1920400d040faddd33f17b43c2d;p=lilypond.git

diff --git a/lily/dispatcher-scheme.cc b/lily/dispatcher-scheme.cc
index e467064bf4..13854b26d7 100644
--- a/lily/dispatcher-scheme.cc
+++ b/lily/dispatcher-scheme.cc
@@ -1,46 +1,58 @@
 /*
-  dispatcher.cc -- implement Scheme bindings for Dispatcher
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 2006--2012 Erik Sandberg  <mandolaerik@gmail.com>
 
-  (c) 2006--2007 Erik Sandberg  <mandolaerik@gmail.com>
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "dispatcher.hh"
 
 LY_DEFINE (ly_make_dispatcher, "ly:make-dispatcher",
-	   0, 0, 0, (),
-	   "Returns a newly created dispatcher.")
+           0, 0, 0, (),
+           "Return a newly created dispatcher.")
 {
   return (new Dispatcher ())->unprotect ();
 }
 
 LY_DEFINE (ly_connect_dispatchers, "ly:connect-dispatchers",
-	   2, 0, 0, (SCM to, SCM from),
-	   "Makes the dispatcher @var{to} listen to events from @var{from}." )
+           2, 0, 0, (SCM to, SCM from),
+           "Make the dispatcher @var{to} listen to events from @var{from}.")
 {
   Dispatcher *t = unsmob_dispatcher (to);
   Dispatcher *f = unsmob_dispatcher (from);
-  
-  LY_ASSERT_SMOB (Dispatcher, to, 1); 
-  LY_ASSERT_SMOB (Dispatcher, from,  2); 
+
+  LY_ASSERT_SMOB (Dispatcher, to, 1);
+  LY_ASSERT_SMOB (Dispatcher, from, 2);
 
   t->register_as_listener (f);
 
-  return SCM_UNDEFINED;
+  return SCM_UNSPECIFIED;
 }
 
 LY_DEFINE (ly_add_listener, "ly:add-listener",
-	   2, 0, 1, (SCM list, SCM disp, SCM cl),
-	   "Adds the listener @var{list} to the dispatcher @var{disp}.\n"
-	   " Whenever @var{disp} hears an event of class @var{cl}, it will be forwarded to @var{list}.\n" )
+           2, 0, 1, (SCM list, SCM disp, SCM cl),
+           "Add the listener @var{list} to the dispatcher @var{disp}."
+           "  Whenever @var{disp} hears an event of class @var{cl},"
+           " it is forwarded to @var{list}.")
 {
   Listener *l = unsmob_listener (list);
   Dispatcher *d = unsmob_dispatcher (disp);
 
-  LY_ASSERT_SMOB (Listener, list, 1); 
-  LY_ASSERT_SMOB (Dispatcher, disp, 2); 
-  
+  LY_ASSERT_SMOB (Listener, list, 1);
+  LY_ASSERT_SMOB (Dispatcher, disp, 2);
+
   for (int arg = SCM_ARG3; scm_is_pair (cl); cl = scm_cdr (cl), arg++)
     {
       SCM sym = scm_car (cl);
@@ -48,20 +60,48 @@ LY_DEFINE (ly_add_listener, "ly:add-listener",
       d->add_listener (*l, sym);
     }
 
-  return SCM_UNDEFINED;
+  return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_listened_event_types, "ly:listened-event-types",
+           1, 0, 0, (SCM disp),
+           "Return a list of all event types that @var{disp} listens"
+           " to.")
+{
+  LY_ASSERT_SMOB (Dispatcher, disp, 1);
+
+  SCM result = unsmob_dispatcher (disp)->listened_types ();
+
+  scm_remember_upto_here_1 (disp);
+
+  return result;
+}
+
+LY_DEFINE (ly_listened_event_class_p, "ly:listened-event-class?",
+           2, 0, 0, (SCM disp, SCM cl),
+           "Does @var{disp} listen to any event type in the list"
+           " @var{cl}?")
+{
+  LY_ASSERT_SMOB (Dispatcher, disp, 1);
+  LY_ASSERT_TYPE (scm_is_pair, cl, 2);
+
+  bool result = unsmob_dispatcher (disp)->is_listened_class (cl);
+
+  scm_remember_upto_here_1 (disp);
+
+  return scm_from_bool (result);
 }
 
 LY_DEFINE (ly_broadcast, "ly:broadcast",
-	   2, 0, 0, (SCM disp, SCM ev),
-	   "Sends the stream event @var{ev} to the dispatcher\n"
-	   "@var{disp}.")
+           2, 0, 0, (SCM disp, SCM ev),
+           "Send the stream event @var{ev} to the dispatcher @var{disp}.")
 {
   Dispatcher *d = unsmob_dispatcher (disp);
   Stream_event *e = unsmob_stream_event (ev);
- 
+
   LY_ASSERT_SMOB (Dispatcher, disp, 1);
 
-  LY_ASSERT_SMOB (Stream_event, ev, 2); 
+  LY_ASSERT_SMOB (Stream_event, ev, 2);
   d->broadcast (e);
-  return SCM_UNDEFINED;
+  return SCM_UNSPECIFIED;
 }