lily/volta-repeat-iterator.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--2015 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 #include "lily-imports.hh"
  24
  25 using std::string;
  26
  27 class Volta_repeat_iterator : public Sequential_iterator
  28 {
  29 public:
  30   DECLARE_SCHEME_CALLBACK (constructor, ());
  31   Volta_repeat_iterator ();
  32
  33   void add_repeat_command (SCM);
  34 protected:
  35   virtual SCM get_music_list () const;
  36   virtual void next_element (bool);
  37   virtual void construct_children ();
  38   virtual void process (Moment);
  39   virtual void derived_mark () const;
  40
  41   bool first_time_;
  42   int alt_count_;
  43   int rep_count_;
  44   int done_count_;
  45   SCM alt_restores_;
  46 };
  47
  48 Volta_repeat_iterator::Volta_repeat_iterator ()
  49 {
  50   done_count_ = alt_count_ = rep_count_ = 0;
  51   first_time_ = true;
  52   alt_restores_ = SCM_EOL;
  53 }
  54
  55 void
  56 Volta_repeat_iterator::derived_mark () const
  57 {
  58   scm_gc_mark (alt_restores_);
  59   Sequential_iterator::derived_mark ();
  60 }
  61
  62 SCM
  63 Volta_repeat_iterator::get_music_list ()const
  64 {
  65   return scm_cons (get_music ()->get_property ("element"),
  66                    Sequential_iterator::get_music_list ());
  67 }
  68
  69 void
  70 Volta_repeat_iterator::construct_children ()
  71 {
  72   Sequential_iterator::construct_children ();
  73
  74   SCM alts = get_music ()->get_property ("elements");
  75
  76   alt_count_ = int (scm_ilength (alts));
  77   rep_count_ = scm_to_int (get_music ()->get_property ("repeat-count"));
  78   done_count_ = 0;
  79 }
  80
  81 /*
  82   TODO: add source information for debugging
  83 */
  84 void
  85 Volta_repeat_iterator::add_repeat_command (SCM what)
  86 {
  87   SCM reps = ly_symbol2scm ("repeatCommands");
  88   SCM current_reps = SCM_EOL;
  89   Context *where = get_outlet ()->where_defined (reps, &current_reps);
  90
  91   if (where && ly_cheap_is_list (current_reps))
  92     {
  93       current_reps = scm_cons (what, current_reps);
  94       where->set_property (reps, current_reps);
  95     }
  96 }
  97
  98 void
  99 Volta_repeat_iterator::next_element (bool side_effect)
 100 {
 101   done_count_++;
 102
 103   Sequential_iterator::next_element (side_effect);
 104
 105   if (side_effect)
 106     {
 107       if (alt_count_)
 108         {
 109           string repstr = ::to_string (rep_count_ - alt_count_ + done_count_) + ".";
 110           if (done_count_ <= 1)
 111             {
 112               alt_restores_ = SCM_EOL;
 113               if (to_boolean (get_outlet ()->get_property ("timing")))
 114                 {
 115                   for (SCM lst = get_outlet ()->get_property ("alternativeRestores");
 116                        scm_is_pair (lst);
 117                        lst = scm_cdr (lst))
 118                     {
 119                       SCM res = SCM_EOL;
 120                       Context *t = get_outlet ()->where_defined (scm_car (lst),
 121                                                                  &res);
 122                       if (t)
 123                         {
 124                           alt_restores_ = scm_cons
 125                             (scm_list_3 (t->self_scm (), scm_car (lst), res),
 126                              alt_restores_);
 127                         }
 128                     }
 129                 }
 130             }
 131           else
 132             {
 133
 134               add_repeat_command (scm_list_n (ly_symbol2scm ("volta"), SCM_BOOL_F, SCM_UNDEFINED));
 135
 136               if (done_count_ - 1 < alt_count_)
 137                 {
 138                   add_repeat_command (ly_symbol2scm ("end-repeat"));
 139
 140                   if (to_boolean (get_outlet ()->get_property ("timing")))
 141                     {
 142                       for (SCM p = alt_restores_; scm_is_pair (p); p = scm_cdr (p))
 143                         scm_apply_0 (Lily::ly_context_set_property_x,
 144                                      scm_car (p));
 145                     }
 146                 }
 147             }
 148
 149           if (done_count_ == 1 && alt_count_ < rep_count_)
 150             repstr = "1.--" + ::to_string (rep_count_ - alt_count_ + done_count_) + ".";
 151
 152           if (done_count_ <= alt_count_)
 153             add_repeat_command (scm_list_n (ly_symbol2scm ("volta"),
 154                                             ly_string2scm (repstr), SCM_UNDEFINED));
 155         }
 156       else
 157         add_repeat_command (ly_symbol2scm ("end-repeat"));
 158     }
 159 }
 160
 161 void
 162 Volta_repeat_iterator::process (Moment m)
 163 {
 164   if (first_time_)
 165     {
 166       add_repeat_command (ly_symbol2scm ("start-repeat"));
 167       first_time_ = false;
 168     }
 169   Sequential_iterator::process (m);
 170 }
 171
 172 IMPLEMENT_CTOR_CALLBACK (Volta_repeat_iterator);