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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "context.hh"
  10 #include "warn.hh"
  11 #include "simultaneous-music-iterator.hh"
  12 #include "music-list.hh"
  13 #include "context-def.hh"
  14
  15
  16 Simultaneous_music_iterator::Simultaneous_music_iterator ()
  17 {
  18   create_separate_contexts_ = false;
  19   children_list_ = SCM_EOL;
  20 }
  21
  22
  23 void
  24 Simultaneous_music_iterator::derived_mark () const
  25 {
  26   scm_gc_mark (children_list_);
  27 }
  28
  29 void
  30 Simultaneous_music_iterator::derived_substitute (Context *f,Context *t)
  31 {
  32   for (SCM s = children_list_; gh_pair_p (s); s = gh_cdr (s))
  33     unsmob_iterator (gh_car (s))-> substitute_outlet (f,t);
  34 }
  35
  36 void
  37 Simultaneous_music_iterator::construct_children ()
  38 {
  39   int j = 0;
  40
  41   SCM i = get_music ()->get_property ("elements");
  42
  43   children_list_ = SCM_EOL;
  44   SCM * tail = &children_list_;
  45   for (; gh_pair_p (i); i = ly_cdr (i), j++)
  46     {
  47       Music *mus = unsmob_music (ly_car (i));
  48
  49       SCM scm_iter = get_static_get_iterator (mus);
  50       Music_iterator * mi = unsmob_iterator (scm_iter);
  51
  52       /* if create_separate_contexts_ is set, create a new context with the
  53          number number as name */
  54
  55       SCM name = unsmob_context_def (get_outlet ()->definition_)->get_context_name ();
  56       Context * t = (j && create_separate_contexts_)
  57         ? get_outlet ()->find_create_context (name, to_string (j), SCM_EOL)
  58         : get_outlet ();
  59
  60       if (!t)
  61         t = get_outlet ();
  62
  63       mi->init_translator (mus, t);
  64       mi->construct_children ();
  65
  66       if (mi->ok ())
  67         {
  68           *tail = scm_cons (scm_iter, *tail);
  69           tail = SCM_CDRLOC (*tail);
  70         }
  71       else
  72         mi->set_translator (0);
  73     }
  74 }
  75
  76 void
  77 Simultaneous_music_iterator::process (Moment until)
  78 {
  79   SCM *proc = &children_list_;
  80   while (gh_pair_p (*proc))
  81     {
  82       Music_iterator * i = unsmob_iterator (gh_car (*proc));
  83       if (i->run_always ()
  84           || i->pending_moment () == until)
  85         {
  86           i->process (until);
  87         }
  88       if (!i->ok ())
  89         {
  90           i->quit ();
  91           *proc = gh_cdr (*proc);
  92         }
  93       else
  94         {
  95           proc = SCM_CDRLOC (*proc);
  96         }
  97     }
  98 }
  99
 100 Moment
 101 Simultaneous_music_iterator::pending_moment () const
 102 {
 103   Moment next;
 104   next.set_infinite (1);
 105
 106   for (SCM s = children_list_; gh_pair_p (s); s = gh_cdr (s))
 107     {
 108       Music_iterator * it = unsmob_iterator (gh_car (s));
 109       next = next <? it->pending_moment ();
 110     }
 111
 112   return next;
 113 }
 114
 115 bool
 116 Simultaneous_music_iterator::ok () const
 117 {
 118   bool run_always_ok = false;
 119   for (SCM s = children_list_; gh_pair_p (s); s = gh_cdr (s))
 120     {
 121       Music_iterator * it = unsmob_iterator (gh_car (s));
 122       if (!it->run_always ())
 123         return true;
 124       else
 125         run_always_ok =  run_always_ok || it->ok ();
 126     }
 127   return run_always_ok;
 128 }
 129
 130 bool
 131 Simultaneous_music_iterator::run_always () const
 132 {
 133   for (SCM s = children_list_; gh_pair_p (s); s = gh_cdr (s))
 134     {
 135       Music_iterator * it = unsmob_iterator (gh_car (s));
 136       if (it->run_always ())
 137         return true;
 138     }
 139   return false;
 140 }
 141
 142 Music_iterator*
 143 Simultaneous_music_iterator::try_music_in_children (Music *m) const
 144 {
 145   Music_iterator * b=0;
 146   for (SCM s = children_list_; !b && gh_pair_p (s); s = gh_cdr (s))
 147     b =unsmob_iterator (gh_car (s))->try_music (m);
 148   return b;
 149 }
 150
 151 void
 152 Simultaneous_music_iterator::do_quit ()
 153 {
 154   for (SCM s = children_list_; gh_pair_p (s); s = gh_cdr (s))
 155     unsmob_iterator (gh_car (s))->quit ();
 156 }
 157
 158 IMPLEMENT_CTOR_CALLBACK (Simultaneous_music_iterator);