lily/volta-repeat-iterator.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--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 "music.hh"
  21 #include "sequential-iterator.hh"
  22 #include "context.hh"
  23
  24 class Volta_repeat_iterator : public Sequential_iterator
  25 {
  26 public:
  27   DECLARE_SCHEME_CALLBACK (constructor, ());
  28   Volta_repeat_iterator ();
  29
  30   void add_repeat_command (SCM);
  31 protected:
  32   virtual SCM get_music_list () const;
  33   virtual void next_element (bool);
  34   virtual void construct_children ();
  35   virtual void process (Moment);
  36
  37   bool first_time_;
  38   int alt_count_;
  39   int rep_count_;
  40   int done_count_;
  41 };
  42
  43 Volta_repeat_iterator::Volta_repeat_iterator ()
  44 {
  45   done_count_ = alt_count_ = rep_count_ = 0;
  46   first_time_ = true;
  47 }
  48
  49 SCM
  50 Volta_repeat_iterator::get_music_list ()const
  51 {
  52   return scm_cons (get_music ()->get_property ("element"),
  53                    get_music ()->get_property ("elements"));
  54 }
  55
  56 void
  57 Volta_repeat_iterator::construct_children ()
  58 {
  59   Sequential_iterator::construct_children ();
  60
  61   SCM alts = get_music ()->get_property ("elements");
  62
  63   alt_count_ = scm_ilength (alts);
  64   rep_count_ = scm_to_int (get_music ()->get_property ("repeat-count"));
  65   done_count_ = 0;
  66 }
  67
  68 /*
  69   TODO: add source information for debugging
  70 */
  71 void
  72 Volta_repeat_iterator::add_repeat_command (SCM what)
  73 {
  74   SCM reps = ly_symbol2scm ("repeatCommands");
  75   SCM current_reps = SCM_EOL;
  76   Context *where = get_outlet ()->where_defined (reps, &current_reps);
  77
  78   if (where
  79        && (current_reps == SCM_EOL || scm_is_pair (current_reps)))
  80     {
  81       current_reps = scm_cons (what, current_reps);
  82       where->set_property (reps, current_reps);
  83     }
  84 }
  85
  86 void
  87 Volta_repeat_iterator::next_element (bool side_effect)
  88 {
  89   done_count_++;
  90
  91   Sequential_iterator::next_element (side_effect);
  92
  93   if (side_effect)
  94     {
  95       if (alt_count_)
  96         {
  97           string repstr = to_string (rep_count_ - alt_count_ + done_count_) + ".";
  98           if (done_count_ > 1)
  99             {
 100               add_repeat_command (scm_list_n (ly_symbol2scm ("volta"), SCM_BOOL_F, SCM_UNDEFINED));
 101
 102               if (done_count_ - 1 < alt_count_)
 103                 add_repeat_command (ly_symbol2scm ("end-repeat"));
 104             }
 105
 106           if (done_count_ == 1 && alt_count_ < rep_count_)
 107             repstr = "1.--" + to_string (rep_count_ - alt_count_ + done_count_) + ".";
 108
 109           if (done_count_ <= alt_count_)
 110             add_repeat_command (scm_list_n (ly_symbol2scm ("volta"),
 111                                             ly_string2scm (repstr), SCM_UNDEFINED));
 112         }
 113       else
 114         add_repeat_command (ly_symbol2scm ("end-repeat"));
 115     }
 116 }
 117
 118 void
 119 Volta_repeat_iterator::process (Moment m)
 120 {
 121   if (first_time_)
 122     {
 123       add_repeat_command (ly_symbol2scm ("start-repeat"));
 124       first_time_ = false;
 125     }
 126   Sequential_iterator::process (m);
 127 }
 128
 129 IMPLEMENT_CTOR_CALLBACK (Volta_repeat_iterator);