lily/ligature-bracket-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--2011 Juergen Reuter <reuter@ipd.uka.de>
   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 "international.hh"
  21
  22 #include "engraver.hh"
  23 #include "note-column.hh"
  24 #include "tuplet-bracket.hh"
  25 #include "spanner.hh"
  26 #include "stream-event.hh"
  27 #include "item.hh"
  28
  29 #include "translator.icc"
  30
  31 class Ligature_bracket_engraver : public Engraver
  32 {
  33 protected:
  34   virtual void process_music ();
  35   virtual void stop_translation_timestep ();
  36   DECLARE_ACKNOWLEDGER (rest);
  37   DECLARE_ACKNOWLEDGER (note_column);
  38   DECLARE_TRANSLATOR_LISTENER (ligature);
  39 public:
  40   TRANSLATOR_DECLARATIONS (Ligature_bracket_engraver);
  41
  42 private:
  43   Drul_array<Stream_event *> events_drul_;
  44   Spanner *finished_ligature_;
  45   Spanner *ligature_;
  46   Stream_event *previous_start_event_;
  47 };
  48
  49 IMPLEMENT_TRANSLATOR_LISTENER (Ligature_bracket_engraver, ligature);
  50 void
  51 Ligature_bracket_engraver::listen_ligature (Stream_event *ev)
  52 {
  53   Direction d = to_dir (ev->get_property ("span-direction"));
  54   ASSIGN_EVENT_ONCE (events_drul_[d], ev);
  55 }
  56
  57 Ligature_bracket_engraver::Ligature_bracket_engraver ()
  58 {
  59   ligature_ = 0;
  60   finished_ligature_ = 0;
  61   events_drul_[LEFT] = events_drul_[RIGHT] = 0;
  62   previous_start_event_ = 0;
  63 }
  64
  65 void
  66 Ligature_bracket_engraver::process_music()
  67 {
  68   if (events_drul_[STOP])
  69     {
  70       if (!ligature_)
  71         {
  72           events_drul_[STOP]->origin ()->warning (_ ("cannot find start of ligature"));
  73           return;
  74         }
  75
  76       finished_ligature_ = ligature_;
  77       ligature_ = 0;
  78       previous_start_event_ = 0;
  79     }
  80
  81   if (events_drul_[START])
  82     {
  83       if (ligature_)
  84         {
  85           events_drul_[START]->origin ()->warning (_ ("already have a ligature"));
  86           return;
  87         }
  88
  89       previous_start_event_ = events_drul_[START];
  90       ligature_ = make_spanner ("LigatureBracket", events_drul_[START]->self_scm ());
  91     }
  92 }
  93
  94 void
  95 Ligature_bracket_engraver::acknowledge_note_column (Grob_info info)
  96 {
  97   if (ligature_)
  98     {
  99       Tuplet_bracket::add_column (ligature_,
 100                                   info.item ());
 101       add_bound_item (ligature_, info.item());
 102     }
 103 }
 104
 105 void
 106 Ligature_bracket_engraver::acknowledge_rest (Grob_info info)
 107 {
 108   acknowledge_note_column(info);
 109 }
 110
 111
 112 void
 113 Ligature_bracket_engraver::stop_translation_timestep ()
 114 {
 115   events_drul_[LEFT] =
 116     events_drul_[RIGHT] = 0;
 117   finished_ligature_ = 0;
 118 }
 119
 120 ADD_ACKNOWLEDGER (Ligature_bracket_engraver, rest);
 121 ADD_ACKNOWLEDGER (Ligature_bracket_engraver, note_column);
 122
 123 ADD_TRANSLATOR (Ligature_bracket_engraver,
 124                 /* doc */
 125                 "Handle @code{Ligature_events} by engraving @code{Ligature}"
 126                 " brackets.",
 127
 128                 /* create */
 129                 "LigatureBracket ",
 130
 131                 /* read */
 132                 "",
 133
 134                 /* write */
 135                 ""
 136                 );