lily/glissando-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2011 Jan Nieuwenhuizen <janneke@gnu.org>
   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
  22 #include "international.hh"
  23 #include "rhythmic-head.hh"
  24 #include "spanner.hh"
  25 #include "stream-event.hh"
  26 #include "warn.hh"
  27 #include "item.hh"
  28
  29 #include "translator.icc"
  30
  31 class Glissando_engraver : public Engraver
  32 {
  33 public:
  34   TRANSLATOR_DECLARATIONS (Glissando_engraver);
  35
  36 protected:
  37   DECLARE_TRANSLATOR_LISTENER (glissando);
  38   DECLARE_ACKNOWLEDGER (rhythmic_head);
  39   virtual void finalize ();
  40
  41   void stop_translation_timestep ();
  42   void process_music ();
  43 private:
  44   Spanner *line_;
  45   Spanner *last_line_;
  46   Stream_event *event_;
  47 };
  48
  49 Glissando_engraver::Glissando_engraver ()
  50 {
  51   last_line_ = line_ = 0;
  52   event_ = 0;
  53 }
  54
  55 IMPLEMENT_TRANSLATOR_LISTENER (Glissando_engraver, glissando);
  56 void
  57 Glissando_engraver::listen_glissando (Stream_event *ev)
  58 {
  59   ASSIGN_EVENT_ONCE (event_, ev);
  60 }
  61
  62 void
  63 Glissando_engraver::process_music ()
  64 {
  65   if (event_)
  66     line_ = make_spanner ("Glissando", event_->self_scm ());
  67 }
  68
  69 void
  70 Glissando_engraver::acknowledge_rhythmic_head (Grob_info info)
  71 {
  72   Grob *g = info.grob ();
  73   if (line_)
  74     line_->set_bound (LEFT, g);
  75
  76   if (last_line_)
  77     {
  78       last_line_->set_bound (RIGHT, g);
  79       announce_end_grob (last_line_, g->self_scm ());
  80     }
  81 }
  82
  83 void
  84 Glissando_engraver::stop_translation_timestep ()
  85 {
  86   if (last_line_ && last_line_->get_bound (RIGHT))
  87     {
  88       last_line_ = 0;
  89     }
  90   if (line_)
  91     {
  92       if (last_line_)
  93         programming_error ("overwriting glissando");
  94       last_line_ = line_;
  95     }
  96   line_ = 0;
  97   event_ = 0;
  98 }
  99
 100 void
 101 Glissando_engraver::finalize ()
 102 {
 103   if (line_)
 104     {
 105       string msg = _ ("unterminated glissando");
 106
 107       if (event_)
 108         event_->origin ()->warning (msg);
 109       else
 110         warning (msg);
 111
 112       line_->suicide ();
 113       line_ = 0;
 114     }
 115 }
 116
 117 ADD_ACKNOWLEDGER (Glissando_engraver, rhythmic_head);
 118 ADD_TRANSLATOR (Glissando_engraver,
 119                 /* doc */
 120                 "Engrave glissandi.",
 121
 122                 /* create */
 123                 "Glissando ",
 124
 125                 /* read */
 126                 "",
 127
 128                 /* write */
 129                 ""
 130                 );