X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fdispatcher-scheme.cc;h=f6ef23d120279e8ded3b0e6678c10c899940be7d;hb=9e781b7dc83b60a543ce218aa1a5f139f74c760f;hp=bd928173d4329c921f3a35906fe5df5875d004ac;hpb=55ac733b69643a6bc6a83b706c65cb56efd388ef;p=lilypond.git

diff --git a/lily/dispatcher-scheme.cc b/lily/dispatcher-scheme.cc
index bd928173d4..f6ef23d120 100644
--- a/lily/dispatcher-scheme.cc
+++ b/lily/dispatcher-scheme.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 2006--2011 Erik Sandberg  <mandolaerik@gmail.com>
+  Copyright (C) 2006--2014 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
@@ -20,39 +20,39 @@
 #include "dispatcher.hh"
 
 LY_DEFINE (ly_make_dispatcher, "ly:make-dispatcher",
-	   0, 0, 0, (),
-	   "Return 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),
-	   "Make 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),
-	   "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}.")
+           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);
@@ -60,19 +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),
-	   "Send the stream event @var{ev} to the dispatcher @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;
 }