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