lily/voice-iterator.cc

   1 /*
   2   voice-iter.cc -- implement Voice_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "translator.hh"
  10 #include "debug.hh"
  11 #include "voice-iterator.hh"
  12 #include "music-list.hh"
  13
  14
  15 void
  16 Voice_iterator::do_print() const
  17 {
  18   if (iter_p_)
  19     iter_p_->print();
  20 }
  21
  22 Voice_iterator::Voice_iterator (Voice const*v)
  23   : PCursor<Music*> (v->music_p_list_)
  24 {
  25   here_mom_ = v->offset_mom_;
  26   voice_C_ = v;
  27   iter_p_ =0;
  28 }
  29
  30 void
  31 Voice_iterator::construct_children()
  32 {
  33   while (PCursor<Music*>::ok())
  34     {
  35       start_next_element();
  36       if (!iter_p_->ok())
  37         {
  38           leave_element();
  39         }
  40       else
  41         {
  42           set_voice_translator();
  43           break;
  44         }
  45     }
  46 }
  47
  48 void
  49 Voice_iterator::leave_element()
  50 {
  51   delete iter_p_;
  52   iter_p_ =0;
  53   MInterval elt_time = ptr()->time_int ();
  54   if (!elt_time.empty_b())
  55     here_mom_ += elt_time.length();
  56   PCursor<Music*>::next();
  57 }
  58
  59 void
  60 Voice_iterator::start_next_element()
  61 {
  62   assert (!iter_p_);
  63   iter_p_ = get_iterator_p (ptr());
  64 }
  65
  66 void
  67 Voice_iterator::set_voice_translator()
  68 {
  69   if (iter_p_->report_to_l()->depth_i () > report_to_l ()->depth_i ())
  70     set_translator (iter_p_->report_to_l());
  71 }
  72
  73 Voice_iterator::~Voice_iterator()
  74 {
  75   assert (! iter_p_);
  76 }
  77
  78
  79 IMPLEMENT_IS_TYPE_B1(Voice_iterator,Music_iterator);
  80
  81 void
  82 Voice_iterator::process_and_next (Moment until)
  83 {
  84   while (1)
  85     {
  86       Moment local_until = until - here_mom_;
  87       while (iter_p_->ok())
  88         {
  89           Moment here = iter_p_->next_moment();
  90           if (here != local_until)
  91             goto loopexit;
  92
  93           iter_p_->process_and_next (local_until);
  94         }
  95
  96       if (!iter_p_->ok())
  97         {
  98           leave_element();
  99
 100           if (PCursor<Music*>::ok())
 101             {
 102               start_next_element();
 103               set_voice_translator();
 104             }
 105           else
 106             {
 107               goto loopexit;
 108             }
 109         }
 110     }
 111
 112 loopexit:
 113
 114   Music_iterator::process_and_next (until);
 115 }
 116
 117 Moment
 118 Voice_iterator::next_moment() const
 119 {
 120   return iter_p_->next_moment() + here_mom_;
 121 }
 122
 123 bool
 124 Voice_iterator::ok() const
 125 {
 126   return iter_p_;
 127 }
 128
 129