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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include "grace-iterator.hh"
   9 #include "translator-group.hh"
  10 #include "debug.hh"
  11 #include "sequential-music-iterator.hh"
  12 #include "music-list.hh"
  13 #include "request-chord-iterator.hh"
  14
  15
  16 void
  17 Sequential_music_iterator::do_print() const
  18 {
  19   if (iter_p_)
  20     iter_p_->print();
  21 }
  22
  23 Sequential_music_iterator::Sequential_music_iterator ()
  24 {
  25   cursor_ = 0;
  26   here_mom_ = 0;
  27   iter_p_ =0;
  28 }
  29
  30 void
  31 Sequential_music_iterator::construct_children()
  32 {
  33   cursor_ = dynamic_cast<Music_sequence const*> (music_l_)->music_list ();
  34
  35   while (gh_pair_p (cursor_ ))
  36     {
  37       start_next_element();
  38       if (!iter_p_->ok())
  39         {
  40           leave_element();
  41         }
  42       else
  43         {
  44           set_sequential_music_translator();
  45           break;
  46         }
  47     }
  48 }
  49
  50 void
  51 Sequential_music_iterator::leave_element()
  52 {
  53   delete iter_p_;
  54   iter_p_ =0;
  55   Moment elt_time = unsmob_music (gh_car (cursor_))->length_mom ();
  56   here_mom_ += elt_time;
  57   cursor_ =gh_cdr (cursor_);
  58 }
  59
  60 void
  61 Sequential_music_iterator::start_next_element()
  62 {
  63   assert (!iter_p_);
  64   iter_p_ = get_iterator_p (unsmob_music (gh_car (cursor_)));
  65 }
  66
  67 void
  68 Sequential_music_iterator::set_sequential_music_translator()
  69 {
  70   Translator_group  * child_report = child_report = iter_p_->report_to_l ();
  71   if (dynamic_cast<Grace_iterator*> (iter_p_))
  72     child_report = child_report->daddy_trans_l_;
  73
  74   if (report_to_l()->depth_i () < child_report->depth_i ())
  75     set_translator (child_report);
  76 }
  77
  78 Sequential_music_iterator::~Sequential_music_iterator()
  79 {
  80   if (iter_p_)
  81     {
  82       if (iter_p_->ok ())
  83         music_l_->origin ()->warning (_ ("Must stop before this music ends"));
  84       delete iter_p_;
  85       iter_p_ = 0;
  86     }
  87 }
  88
  89 void
  90 Sequential_music_iterator::do_process_and_next (Moment until)
  91 {
  92   if (!iter_p_)
  93     return;
  94
  95   while (1)
  96     {
  97       Moment local_until = until - here_mom_;
  98       while (iter_p_->ok())
  99         {
 100           Moment here = iter_p_->next_moment();
 101           if (here != local_until)
 102             goto loopexit;
 103
 104           iter_p_->process_and_next (local_until);
 105         }
 106
 107       if (!iter_p_->ok())
 108         {
 109           set_sequential_music_translator();
 110           leave_element();
 111
 112           if (gh_pair_p (cursor_))
 113             start_next_element();
 114           else
 115             goto loopexit;
 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
 131 bool
 132 Sequential_music_iterator::ok() const
 133 {
 134   return iter_p_;
 135 }
 136
 137 Music_iterator*
 138 Sequential_music_iterator::try_music_in_children (Music *m) const
 139 {
 140   return iter_p_ ? iter_p_->try_music (m) : 0;
 141 }