lily/listener.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005 Erik Sandberg  <mandolaerik@gmail.com>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "listener.hh"
  21 #include "ly-smobs.icc"
  22 #include "warn.hh"
  23
  24 Listener::Listener ()
  25 {
  26   target_ = 0;
  27   type_ = 0;
  28 }
  29
  30 Listener::Listener (const void *target, Listener_function_table *type)
  31 {
  32   target_ = (void *)target;
  33   type_ = type;
  34 }
  35
  36 Listener::Listener (Listener const &other)
  37 {
  38   target_ = other.target_;
  39   type_ = other.type_;
  40 }
  41
  42 void Listener::listen (SCM ev) const {
  43   (type_->listen_callback) (target_, ev);
  44 }
  45
  46 SCM
  47 Listener::mark_smob (SCM sm)
  48 {
  49   Listener *me = (Listener *) SCM_CELL_WORD_1 (sm);
  50   if (me->type_)
  51     (me->type_->mark_callback) (me->target_);
  52   return SCM_EOL;
  53 }
  54
  55 int
  56 Listener::print_smob (SCM, SCM p, scm_print_state*)
  57 {
  58   scm_puts ("#<Listener>", p);
  59   return 1;
  60 }
  61
  62 SCM
  63 Listener::equal_p (SCM a, SCM b)
  64 {
  65   Listener *l1 = unsmob_listener (a);
  66   Listener *l2 = unsmob_listener (b);
  67
  68   return (*l1 == *l2) ? SCM_BOOL_T : SCM_BOOL_F;
  69 }
  70
  71 IMPLEMENT_SIMPLE_SMOBS (Listener);
  72 IMPLEMENT_TYPE_P (Listener, "ly:listener?");