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--2000 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   SCM i = sim->music_list ();
  32   for (; gh_pair_p(i); i = gh_cdr(i), j++)
  33     {
  34       Music *mus = unsmob_music (gh_car (i));
  35       Music_iterator * mi = static_get_iterator_p (mus);
  36
  37       /* if separate_contexts_b_ is set, create a new context with the
  38          number number as name */
  39
  40       Translator_group * t = (j && separate_contexts_b_)
  41         ? report_to_l ()->find_create_translator_l (report_to_l()->type_str_,
  42                                                     to_str (j))
  43         : report_to_l ();
  44
  45       if (!t)
  46         t = report_to_l ();
  47
  48       mi->init_translator (mus, t);
  49       mi->construct_children ();
  50
  51       if (mi->ok())
  52         {
  53           children_p_list_.append (new Killing_cons<Music_iterator> (mi,0));
  54         }
  55       else
  56         delete mi;
  57     }
  58 }
  59
  60 void
  61 Simultaneous_music_iterator::do_print() const
  62 {
  63 #ifndef NPRINT
  64   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  65     p->car_->print();
  66 #endif
  67 }
  68
  69 void
  70 Simultaneous_music_iterator::do_process_and_next (Moment until)
  71 {
  72   for (Cons<Music_iterator> **pp = &children_p_list_.head_; *pp; )
  73     {
  74       Music_iterator * i = (*pp)->car_;
  75       if  (i->next_moment() == until)
  76         {
  77           i->process_and_next (until);
  78         }
  79       if (!i->ok())
  80         delete children_p_list_.remove_cons (pp);
  81       else
  82         pp = &(*pp)->next_;
  83     }
  84   Music_iterator::do_process_and_next (until);
  85 }
  86
  87
  88
  89
  90 Moment
  91 Simultaneous_music_iterator::next_moment() const
  92 {
  93   Moment next;
  94   next.set_infinite (1);
  95
  96   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  97     next = next <? p->car_->next_moment() ;
  98   return next;
  99 }
 100
 101
 102
 103 bool
 104 Simultaneous_music_iterator::ok() const
 105 {
 106   return children_p_list_.head_;
 107 }
 108
 109 Music_iterator*
 110 Simultaneous_music_iterator::try_music_in_children (Music *m) const
 111 {
 112   Music_iterator * b=0;
 113   for (Cons<Music_iterator> *p = children_p_list_.head_; !b && p; p = p->next_)
 114     b =p->car_->try_music (m);
 115   return b;
 116 }