Added data structures for music streams.

[lilypond.git] / lily / scheme-listener.cc

diff --git a/lily/scheme-listener.cc b/lily/scheme-listener.cc
new file mode 100644 (file)
index 0000000..d6ef475
--- /dev/null
+++ b/lily/scheme-listener.cc
@@ -0,0 +1,48 @@
+/*
+  scheme-listener.cc -- Implement Scheme_listener
+
+  source file of the GNU LilyPond music typesetter
+
+  (c) 2006 Erik Sandberg  <mandolaerik@gmail.com>
+*/
+
+#include "scheme-listener.hh"
+
+IMPLEMENT_LISTENER (Scheme_listener, call)
+void
+Scheme_listener::call (SCM ev)
+{
+  scm_call_1 (callback_, ev);
+}
+
+IMPLEMENT_SMOBS (Scheme_listener);
+IMPLEMENT_DEFAULT_EQUAL_P (Scheme_listener);
+
+Scheme_listener::Scheme_listener (SCM c)
+{
+  callback_ = SCM_EOL;
+  self_scm_ = SCM_EOL;
+  smobify_self ();
+  callback_ = c; 
+}
+
+SCM
+Scheme_listener::mark_smob (SCM obj)
+{
+  Scheme_listener *me = (Scheme_listener *) SCM_CELL_WORD_1 (obj);
+  return me->callback_;
+}
+
+int
+Scheme_listener::print_smob (SCM obj, SCM p, scm_print_state*)
+{
+  Scheme_listener *me = (Scheme_listener *) SCM_CELL_WORD_1 (obj);
+  scm_puts ("#<Scheme_listener ", p);
+  scm_write (me->callback_, p);
+  scm_puts (">", p);
+  return 1;
+}
+
+Scheme_listener::~Scheme_listener ()
+{
+}