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--2001 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 (Simultaneous_music_iterator const& src)
  21   : Music_iterator (src)
  22 {
  23   separate_contexts_b_ = src.separate_contexts_b_;
  24   for (Cons<Music_iterator> *p = src.children_p_list_.head_; p; p = p->next_)
  25     {
  26       Music_iterator *i = p->car_;
  27       children_p_list_.append (new Killing_cons<Music_iterator> (i->clone (), 0));
  28     }
  29 }
  30
  31 Simultaneous_music_iterator::~Simultaneous_music_iterator ()
  32 {
  33   children_p_list_.junk ();
  34 }
  35
  36 SCM
  37 Simultaneous_music_iterator::get_music (Moment m)const
  38 {
  39   SCM s = SCM_EOL;
  40   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
  41     {
  42       s = gh_append2 (p->car_->get_music (m), s);
  43     }
  44   return s;
  45 }
  46
  47 void
  48 Simultaneous_music_iterator::construct_children()
  49 {
  50   int j = 0;
  51   Music_sequence const *sim = dynamic_cast<Music_sequence const*> (music_l_);
  52
  53   SCM i = sim->music_list ();
  54   for (; gh_pair_p(i); i = gh_cdr(i), j++)
  55     {
  56       Music *mus = unsmob_music (gh_car (i));
  57       Music_iterator * mi = static_get_iterator_p (mus);
  58
  59       /* if separate_contexts_b_ is set, create a new context with the
  60          number number as name */
  61
  62       Translator_group * t = (j && separate_contexts_b_)
  63         ? report_to_l ()->find_create_translator_l (report_to_l()->type_str_,
  64                                                     to_str (j))
  65         : report_to_l ();
  66
  67       if (!t)
  68         t = report_to_l ();
  69
  70       mi->init_translator (mus, t);
  71       mi->construct_children ();
  72
  73       if (mi->ok())
  74         {
  75           children_p_list_.append (new Killing_cons<Music_iterator> (mi,0));
  76         }
  77       else
  78         delete mi;
  79     }
  80 }
  81
  82
  83 void
  84 Simultaneous_music_iterator::process (Moment until)
  85 {
  86   for (Cons<Music_iterator> **pp = &children_p_list_.head_; *pp;)
  87     {
  88       Music_iterator * i = (*pp)->car_;
  89       if  (i->pending_moment() == until)
  90         {
  91           i->process (until);
  92         }
  93       if (!i->ok())
  94         delete children_p_list_.remove_cons (pp);
  95       else
  96         pp = &(*pp)->next_;
  97     }
  98 }
  99
 100 void
 101 Simultaneous_music_iterator::skip (Moment until)
 102 {
 103   for (Cons<Music_iterator> **pp = &children_p_list_.head_; *pp;)
 104     {
 105       Music_iterator * i = (*pp)->car_;
 106       if (i->pending_moment() <= until)
 107         {
 108           i->skip (until);
 109         }
 110       if (!i->ok())
 111         delete children_p_list_.remove_cons (pp);
 112       else
 113         pp = &(*pp)->next_;
 114     }
 115 }
 116
 117 Moment
 118 Simultaneous_music_iterator::pending_moment() const
 119 {
 120   Moment next;
 121   next.set_infinite (1);
 122
 123   for (Cons<Music_iterator> *p = children_p_list_.head_; p; p = p->next_)
 124     next = next <? p->car_->pending_moment() ;
 125   return next;
 126 }
 127
 128
 129
 130 bool
 131 Simultaneous_music_iterator::ok() const
 132 {
 133   return children_p_list_.head_;
 134 }
 135
 136 Music_iterator*
 137 Simultaneous_music_iterator::try_music_in_children (Music *m) const
 138 {
 139   Music_iterator * b=0;
 140   for (Cons<Music_iterator> *p = children_p_list_.head_; !b && p; p = p->next_)
 141     b =p->car_->try_music (m);
 142   return b;
 143 }
 144
 145
 146
 147 IMPLEMENT_CTOR_CALLBACK(Simultaneous_music_iterator);