lily/volta-repeat-iterator.cc

   1 /*
   2   volta-repeat-iterator.cc -- implement Volta_repeat_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6
   7   (c) 2002--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 */
   9
  10 #include "music.hh"
  11 #include "sequential-iterator.hh"
  12 #include "context.hh"
  13
  14 class Volta_repeat_iterator : public Sequential_iterator
  15 {
  16 public:
  17   DECLARE_SCHEME_CALLBACK (constructor, ());
  18   Volta_repeat_iterator ();
  19
  20   void add_repeat_command (SCM);
  21 protected:
  22   virtual SCM get_music_list () const;
  23   virtual void next_element (bool);
  24   virtual void construct_children ();
  25   virtual void process (Moment);
  26
  27   bool first_time_;
  28   int alt_count_;
  29   int rep_count_;
  30   int done_count_;
  31 };
  32
  33 Volta_repeat_iterator::Volta_repeat_iterator ()
  34 {
  35   done_count_ = alt_count_ = rep_count_ = 0;
  36   first_time_ = true;
  37 }
  38
  39 SCM
  40 Volta_repeat_iterator::get_music_list ()const
  41 {
  42   return scm_cons (get_music ()->get_property ("element"),
  43                    get_music ()->get_property ("elements"));
  44 }
  45
  46 void
  47 Volta_repeat_iterator::construct_children ()
  48 {
  49   Sequential_iterator::construct_children ();
  50
  51   SCM alts = get_music ()->get_property ("elements");
  52
  53   alt_count_ = scm_ilength (alts);
  54   rep_count_ = scm_to_int (get_music ()->get_property ("repeat-count"));
  55   done_count_ = 0;
  56 }
  57
  58 /*
  59   TODO: add source information for debugging
  60 */
  61 void
  62 Volta_repeat_iterator::add_repeat_command (SCM what)
  63 {
  64   SCM reps = ly_symbol2scm ("repeatCommands");
  65   SCM current_reps = SCM_EOL;
  66   Context *where = get_outlet ()->where_defined (reps, &current_reps);
  67
  68   if (where
  69        && (current_reps == SCM_EOL || scm_is_pair (current_reps)))
  70     {
  71       current_reps = scm_cons (what, current_reps);
  72       where->set_property (reps, current_reps);
  73     }
  74 }
  75
  76 void
  77 Volta_repeat_iterator::next_element (bool side_effect)
  78 {
  79   done_count_++;
  80
  81   Sequential_iterator::next_element (side_effect);
  82
  83   if (side_effect)
  84     {
  85       if (alt_count_)
  86         {
  87           string repstr = to_string (rep_count_ - alt_count_ + done_count_) + ".";
  88           if (done_count_ > 1)
  89             {
  90               add_repeat_command (scm_list_n (ly_symbol2scm ("volta"), SCM_BOOL_F, SCM_UNDEFINED));
  91
  92               if (done_count_ - 1 < alt_count_)
  93                 add_repeat_command (ly_symbol2scm ("end-repeat"));
  94             }
  95
  96           if (done_count_ == 1 && alt_count_ < rep_count_)
  97             repstr = "1.--" + to_string (rep_count_ - alt_count_ + done_count_) + ".";
  98
  99           if (done_count_ <= alt_count_)
 100             add_repeat_command (scm_list_n (ly_symbol2scm ("volta"),
 101                                             ly_string2scm (repstr), SCM_UNDEFINED));
 102         }
 103       else
 104         add_repeat_command (ly_symbol2scm ("end-repeat"));
 105     }
 106 }
 107
 108 void
 109 Volta_repeat_iterator::process (Moment m)
 110 {
 111   if (first_time_)
 112     {
 113       add_repeat_command (ly_symbol2scm ("start-repeat"));
 114       first_time_ = false;
 115     }
 116   Sequential_iterator::process (m);
 117 }
 118
 119 IMPLEMENT_CTOR_CALLBACK (Volta_repeat_iterator);