lily/thread-devnull-engraver.cc

   1 /*
   2   thread-devnull-engraver.cc -- implement Thread_devnull_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "item.hh"
  11 #include "musical-request.hh"
  12 #include "translator-group.hh"
  13
  14 class Thread_devnull_engraver : public Engraver
  15 {
  16 public:
  17   VIRTUAL_COPY_CONS (Translator);
  18
  19 protected:
  20   virtual void acknowledge_grob (Grob_info);
  21 };
  22
  23 ADD_THIS_TRANSLATOR (Thread_devnull_engraver);
  24
  25 void
  26 Thread_devnull_engraver::acknowledge_grob (Grob_info i)
  27 {
  28   SCM s = get_property ("devNullThread");
  29 #if 0
  30   /* No need, next if will never be true */
  31   if (s == ly_symbol2scm ("never"))
  32     return;
  33 #endif
  34
  35   if (s == ly_symbol2scm ("allways")
  36       || (s == SCM_EOL
  37           && daddy_trans_l_->id_str_.left_str (3) == "two"
  38           && (to_boolean (get_property ("unison"))
  39               || to_boolean (get_property ("unisilence")))
  40           && to_boolean (get_property ("soloADue"))))
  41     {
  42       /* Ugh, we can suicide them, but they remain living */
  43       i.elem_l_->suicide ();
  44     }
  45 }