lily/voice-devnull-engraver.cc

   1 /*
   2   voice-devnull-engraver.cc -- implement Voice_devnull_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 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 Voice_devnull_engraver : public Engraver
  15 {
  16 public:
  17   VIRTUAL_COPY_CONS (Translator);
  18
  19 protected:
  20   virtual void acknowledge_element (Score_element_info);
  21 };
  22
  23 ADD_THIS_TRANSLATOR (Voice_devnull_engraver);
  24
  25 static char const *junk_interfaces[] = {
  26   //    "beam-interface",
  27   "slur-interface",
  28   "tie-interface",
  29   "text-item-interface",
  30   "text-script-interface",
  31   "dynamic-interface",
  32   "crescendo-interface",
  33   0
  34 };
  35
  36 void
  37 Voice_devnull_engraver::acknowledge_element (Score_element_info i)
  38 {
  39   if (daddy_trans_l_->id_str_ == "two"
  40       && (to_boolean (get_property ("unison"))
  41           || to_boolean (get_property ("unisilence"))))
  42     for (char const **p = junk_interfaces; *p; p++)
  43       if (i.elem_l_->has_interface (ly_symbol2scm (*p)))
  44         {
  45           i.elem_l_->suicide ();
  46           return;
  47         }
  48 }