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       if (!t)
  45         t = report_to_l ();
  46
  47       mi->init_translator (i->car_, t);
  48       mi->construct_children ();
  49
  50       if (mi->ok())
  51         {
  52           children_p_list_.append (new Killing_cons<Music_iterator> (mi,0));
  53         }
  54       else
  55         delete mi;
  56     }
  57 }
  58
  59 void
  60 Simultaneous_music_iterator::do_print() const
  61 {
  62 #ifndef NPRINT
  63   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  64     p->car_->print();
  65 #endif
  66 }
  67
  68 void
  69 Simultaneous_music_iterator::do_process_and_next (Moment until)
  70 {
  71   for (Cons<Music_iterator> **pp = &children_p_list_.head_; *pp; )
  72     {
  73       Music_iterator * i = (*pp)->car_;
  74       if  (i->next_moment() == until)
  75         {
  76           i->process_and_next (until);
  77         }
  78       if (!i->ok())
  79         delete children_p_list_.remove_cons (pp);
  80       else
  81         pp = &(*pp)->next_;
  82     }
  83   Music_iterator::do_process_and_next (until);
  84 }
  85
  86
  87
  88
  89 Moment
  90 Simultaneous_music_iterator::next_moment() const
  91 {
  92   Moment next;
  93   next.set_infinite (1);
  94
  95   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  96     next = next <? p->car_->next_moment() ;
  97   return next;
  98 }
  99
 100
 101
 102 bool
 103 Simultaneous_music_iterator::ok() const
 104 {
 105   return children_p_list_.head_;
 106 }
 107
 108 Music_iterator*
 109 Simultaneous_music_iterator::try_music_in_children (Music const*m) const
 110 {
 111   Music_iterator * b=0;
 112   for (Cons<Music_iterator> *p = children_p_list_.head_; !b && p; p = p->next_)
 113     b =p->car_->try_music (m);
 114   return b;
 115 }