lily/sequential-music-iterator.cc

   1 /*
   2   Sequential_music_iterator.cc -- implement Sequential_music_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "translator-group.hh"
  10 #include "debug.hh"
  11 #include "sequential-music-iterator.hh"
  12 #include "music-list.hh"
  13
  14
  15 void
  16 Sequential_music_iterator::do_print() const
  17 {
  18   if (iter_p_)
  19     iter_p_->print();
  20 }
  21
  22 Sequential_music_iterator::Sequential_music_iterator ()
  23 {
  24   cursor_p_ = 0;
  25   here_mom_ = 0;
  26   iter_p_ =0;
  27 }
  28
  29 Sequential_music*
  30 Sequential_music_iterator::sequential_music_l () const
  31 {
  32   return (Sequential_music *)music_l_;
  33 }
  34
  35 void
  36 Sequential_music_iterator::construct_children()
  37 {
  38   cursor_p_ = new PCursor<Music*> (sequential_music_l ()->music_p_list_p_->top ());
  39
  40   while (cursor_p_->ok())
  41     {
  42       start_next_element();
  43       if (!iter_p_->ok())
  44         {
  45           leave_element();
  46         }
  47       else
  48         {
  49           set_Sequential_music_translator();
  50           break;
  51         }
  52     }
  53 }
  54
  55 void
  56 Sequential_music_iterator::leave_element()
  57 {
  58   delete iter_p_;
  59   iter_p_ =0;
  60   Moment elt_time = cursor_p_->ptr()->duration ();
  61   here_mom_ += elt_time;
  62   cursor_p_->next();
  63 }
  64
  65 void
  66 Sequential_music_iterator::start_next_element()
  67 {
  68   assert (!iter_p_);
  69   iter_p_ = get_iterator_p ( cursor_p_->ptr());
  70 }
  71
  72 void
  73 Sequential_music_iterator::set_Sequential_music_translator()
  74 {
  75   if (iter_p_->report_to_l()->depth_i () > report_to_l ()->depth_i ())
  76     set_translator (iter_p_->report_to_l());
  77 }
  78
  79 Sequential_music_iterator::~Sequential_music_iterator()
  80 {
  81   delete cursor_p_;
  82   assert (! iter_p_);
  83 }
  84
  85
  86
  87
  88 void
  89 Sequential_music_iterator::do_process_and_next (Moment until)
  90 {
  91   while (1)
  92     {
  93       Moment local_until = until - here_mom_;
  94       while (iter_p_->ok())
  95         {
  96           Moment here = iter_p_->next_moment();
  97           if (here != local_until)
  98             goto loopexit;
  99
 100           iter_p_->process_and_next (local_until);
 101         }
 102
 103       if (!iter_p_->ok())
 104         {
 105           leave_element();
 106
 107           if (cursor_p_->ok())
 108             {
 109               start_next_element();
 110               set_Sequential_music_translator();
 111             }
 112           else
 113             {
 114               goto loopexit;
 115             }
 116         }
 117     }
 118
 119 loopexit:
 120
 121   Music_iterator::do_process_and_next (until);
 122 }
 123
 124 Moment
 125 Sequential_music_iterator::next_moment() const
 126 {
 127   return iter_p_->next_moment() + here_mom_;
 128 }
 129
 130 bool
 131 Sequential_music_iterator::ok() const
 132 {
 133   return iter_p_;
 134 }
 135