lily/simultaneous-music-iterator.cc

   1 /*
   2   Simultaneous_music-iterator.cc -- implement Simultaneous_music_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "translator-group.hh"
  10 #include "debug.hh"
  11 #include "simultaneous-music-iterator.hh"
  12 #include "music-list.hh"
  13 #include "killing-cons.tcc"
  14
  15 Simultaneous_music_iterator::Simultaneous_music_iterator ()
  16 {
  17   separate_contexts_b_ = false;
  18 }
  19
  20 Simultaneous_music_iterator::~Simultaneous_music_iterator ()
  21 {
  22   children_p_list_.junk ();
  23 }
  24
  25 void
  26 Simultaneous_music_iterator::construct_children()
  27 {
  28   int j = 0;
  29   Music_sequence const *sim = dynamic_cast<Music_sequence const*> (music_l_);
  30
  31   Cons<Music> *i = (sim->music_p_list_p_) ? sim->music_p_list_p_->head_ : 0;
  32   for (; i;  i = i->next_, j++)
  33     {
  34       Music_iterator * mi = static_get_iterator_p (i->car_);
  35
  36       /* if separate_contexts_b_ is set, create a new context with the
  37          number number as name */
  38
  39       Translator_group * t = (j && separate_contexts_b_)
  40         ? report_to_l ()->find_create_translator_l (report_to_l()->type_str_,
  41                                                     to_str (j))
  42         : report_to_l ();
  43
  44       mi->init_translator (i->car_, t);
  45       mi->construct_children ();
  46
  47       if (mi->ok())
  48         {
  49           children_p_list_.append (new Killing_cons<Music_iterator> (mi,0));
  50         }
  51       else
  52         delete mi;
  53     }
  54 }
  55
  56 void
  57 Simultaneous_music_iterator::do_print() const
  58 {
  59 #ifndef NPRINT
  60   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  61     p->car_->print();
  62 #endif
  63 }
  64
  65 void
  66 Simultaneous_music_iterator::do_process_and_next (Moment until)
  67 {
  68   for (Cons<Music_iterator> **pp = &children_p_list_.head_; *pp; )
  69     {
  70       Music_iterator * i = (*pp)->car_;
  71       if  (i->next_moment() == until)
  72         {
  73           i->process_and_next (until);
  74         }
  75       if (!i->ok())
  76         delete children_p_list_.remove_cons (pp);
  77       else
  78         pp = &(*pp)->next_;
  79     }
  80   Music_iterator::do_process_and_next (until);
  81 }
  82
  83
  84
  85
  86 Moment
  87 Simultaneous_music_iterator::next_moment() const
  88 {
  89   Moment next;
  90   next.set_infinite (1);
  91
  92   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  93     next = next <? p->car_->next_moment() ;
  94   return next;
  95 }
  96
  97
  98
  99 bool
 100 Simultaneous_music_iterator::ok() const
 101 {
 102   return children_p_list_.head_;
 103 }
 104