lily/output-property-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   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 "engraver.hh"
  21 #include "context.hh"
  22 #include "grob.hh"
  23 #include "stream-event.hh"
  24
  25 #include "translator.icc"
  26
  27
  28 class Output_property_engraver : public Engraver
  29 {
  30   TRANSLATOR_DECLARATIONS (Output_property_engraver);
  31 protected:
  32   vector<Stream_event*> props_;
  33
  34   DECLARE_ACKNOWLEDGER (grob);
  35   DECLARE_TRANSLATOR_LISTENER (apply_output);
  36
  37   void stop_translation_timestep ();
  38 };
  39
  40 IMPLEMENT_TRANSLATOR_LISTENER (Output_property_engraver, apply_output);
  41 void
  42 Output_property_engraver::listen_apply_output (Stream_event *ev)
  43 {
  44   /*
  45     UGH. Only swallow the output property event in the context
  46     it was intended for. This is inelegant but not inefficient.
  47   */
  48   if (context ()->is_alias (ev->get_property ("context-type")))
  49     props_.push_back (ev);
  50 }
  51
  52 void
  53 Output_property_engraver::acknowledge_grob (Grob_info inf)
  54 {
  55   for (vsize i = props_.size (); i--;)
  56     {
  57       Stream_event *o = props_[i];
  58       Context *d = inf.context ();
  59       SCM proc = o->get_property ("procedure");
  60       scm_call_3 (proc,
  61                   inf.grob ()->self_scm (),
  62                   d->self_scm (),
  63                   context ()->self_scm ());
  64     }
  65 }
  66
  67 void
  68 Output_property_engraver::stop_translation_timestep ()
  69 {
  70   props_.clear ();
  71 }
  72
  73 Output_property_engraver::Output_property_engraver ()
  74 {
  75 }
  76
  77 ADD_ACKNOWLEDGER (Output_property_engraver, grob);
  78 ADD_TRANSLATOR (Output_property_engraver,
  79                 /* doc */
  80                 "Apply a procedure to any grob acknowledged.",
  81
  82                 /* create */
  83                 "",
  84
  85                 /* read */
  86                 "",
  87
  88                 /* write */
  89                 ""
  90                 );