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 "ligature-engraver.hh"
  23 #include "note-column.hh"
  24 #include "tuplet-bracket.hh"
  25 #include "spanner.hh"
  26 #include "stream-event.hh"
  27 #include "spanner.hh"
  28 #include "item.hh"
  29
  30 #include "translator.icc"
  31
  32 class Ligature_bracket_engraver : public Engraver
  33 {
  34 protected:
  35   virtual void process_music ();
  36   virtual void stop_translation_timestep ();
  37   DECLARE_ACKNOWLEDGER (rest);
  38   DECLARE_ACKNOWLEDGER (note_column);
  39   DECLARE_TRANSLATOR_LISTENER (ligature);
  40 public:
  41   TRANSLATOR_DECLARATIONS (Ligature_bracket_engraver);
  42
  43 private:
  44   Drul_array<Stream_event *> events_drul_;
  45   Spanner *finished_ligature_;
  46   Spanner *ligature_;
  47   Stream_event *previous_start_event_;
  48 };
  49
  50 IMPLEMENT_TRANSLATOR_LISTENER (Ligature_bracket_engraver, ligature);
  51 void
  52 Ligature_bracket_engraver::listen_ligature (Stream_event *ev)
  53 {
  54   Direction d = to_dir (ev->get_property ("span-direction"));
  55   ASSIGN_EVENT_ONCE (events_drul_[d], ev);
  56 }
  57
  58 Ligature_bracket_engraver::Ligature_bracket_engraver ()
  59 {
  60   ligature_ = 0;
  61   finished_ligature_ = 0;
  62   events_drul_[LEFT] = events_drul_[RIGHT] = 0;
  63   previous_start_event_ = 0;
  64 }
  65
  66 void
  67 Ligature_bracket_engraver::process_music()
  68 {
  69   if (events_drul_[STOP])
  70     {
  71       if (!ligature_)
  72         {
  73           events_drul_[STOP]->origin ()->warning (_ ("cannot find start of ligature"));
  74           return;
  75         }
  76
  77       finished_ligature_ = ligature_;
  78       ligature_ = 0;
  79       previous_start_event_ = 0;
  80     }
  81
  82   if (events_drul_[START])
  83     {
  84       if (ligature_)
  85         {
  86           events_drul_[START]->origin ()->warning (_ ("already have a ligature"));
  87           return;
  88         }
  89
  90       previous_start_event_ = events_drul_[START];
  91       ligature_ = make_spanner ("LigatureBracket", events_drul_[START]->self_scm ());
  92     }
  93 }
  94
  95 void
  96 Ligature_bracket_engraver::acknowledge_note_column (Grob_info info)
  97 {
  98   if (ligature_)
  99     {
 100       Tuplet_bracket::add_column (ligature_,
 101                                   info.item ());
 102       add_bound_item (ligature_, info.item());
 103     }
 104 }
 105
 106 void
 107 Ligature_bracket_engraver::acknowledge_rest (Grob_info info)
 108 {
 109   acknowledge_note_column(info);
 110 }
 111
 112
 113 void
 114 Ligature_bracket_engraver::stop_translation_timestep ()
 115 {
 116   events_drul_[LEFT] =
 117     events_drul_[RIGHT] = 0;
 118   finished_ligature_ = 0;
 119 }
 120
 121 ADD_ACKNOWLEDGER (Ligature_bracket_engraver, rest);
 122 ADD_ACKNOWLEDGER (Ligature_bracket_engraver, note_column);
 123
 124 ADD_TRANSLATOR (Ligature_bracket_engraver,
 125                 /* doc */
 126                 "Handle @code{Ligature_events} by engraving @code{Ligature}"
 127                 " brackets.",
 128
 129                 /* create */
 130                 "LigatureBracket ",
 131
 132                 /* read */
 133                 "",
 134
 135                 /* write */
 136                 ""
 137                 );