lily/lyric-combine-music-iterator.cc

   1 /*
   2   lyric-combine-music-iterator.cc --  implement Lyric_combine_music_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "translator-group.hh"
  11 #include "lyric-combine-music.hh"
  12 #include "event.hh"
  13 #include "note-head.hh"
  14 #include "grob.hh"
  15 #include "music-iterator.hh"
  16
  17 class Lyric_combine_music_iterator : public Music_iterator
  18 {
  19 public:
  20   Lyric_combine_music_iterator ();
  21   Lyric_combine_music_iterator (Lyric_combine_music_iterator const&src);
  22   DECLARE_SCHEME_CALLBACK(constructor, ());
  23 protected:
  24   virtual void construct_children ();
  25   virtual Moment pending_moment () const;
  26   virtual void do_quit();
  27   virtual void process (Moment);
  28   virtual Music_iterator *try_music_in_children (Music *) const;
  29
  30   virtual bool ok () const;
  31   virtual void derived_mark () const;
  32   virtual void derived_substitute (Translator_group*,Translator_group*) ;
  33 private:
  34   bool get_busy_status ()const ;
  35   bool melisma_busy ();
  36
  37   Music_iterator * music_iter_;
  38   Music_iterator * lyric_iter_;
  39 };
  40
  41
  42 bool
  43 melisma_busy (Translator* tr)
  44 {
  45   SCM melisma_properties = tr->get_property ("melismaBusyProperties");
  46   bool busy = false;
  47
  48   for (; gh_pair_p (melisma_properties);
  49        melisma_properties = gh_cdr (melisma_properties))
  50     busy = busy || to_boolean (tr->internal_get_property (gh_car (melisma_properties)));
  51
  52   return busy;
  53 }
  54
  55
  56
  57 /*
  58   Ugh, why static?
  59  */
  60 Music *busy_req;
  61 Music *melisma_playing_req;
  62
  63 Lyric_combine_music_iterator::Lyric_combine_music_iterator ()
  64 {
  65   music_iter_ =0;
  66   lyric_iter_ =0;
  67
  68   if (!busy_req)
  69     {
  70       busy_req
  71         = make_music_by_name (ly_symbol2scm ("BusyPlayingEvent"));
  72       melisma_playing_req
  73         = make_music_by_name (ly_symbol2scm ("MelismaPlayingEvent"));
  74     }
  75 }
  76
  77 Moment
  78 Lyric_combine_music_iterator::pending_moment () const
  79 {
  80   Moment musnext = music_iter_->pending_moment ();
  81   return musnext;
  82 }
  83
  84 bool
  85 Lyric_combine_music_iterator::ok () const
  86 {
  87   return music_iter_->ok ();
  88 }
  89
  90 void
  91 Lyric_combine_music_iterator::derived_mark()const
  92 {
  93   if (music_iter_)
  94     scm_gc_mark (music_iter_->self_scm());
  95   if (lyric_iter_)
  96     scm_gc_mark (lyric_iter_->self_scm());
  97 }
  98
  99 void
 100 Lyric_combine_music_iterator::derived_substitute (Translator_group*f,Translator_group* t)
 101 {
 102   if (music_iter_)
 103     music_iter_->substitute_outlet (f,t);
 104   if (lyric_iter_)
 105     lyric_iter_->substitute_outlet (f,t);
 106 }
 107
 108 void
 109 Lyric_combine_music_iterator::construct_children ()
 110 {
 111   Lyric_combine_music const * m = dynamic_cast<Lyric_combine_music const*> (get_music ());
 112
 113   music_iter_ = unsmob_iterator (get_iterator (m->get_music ()));
 114   lyric_iter_ = unsmob_iterator (get_iterator (m->get_lyrics ()));
 115 }
 116
 117 bool
 118 Lyric_combine_music_iterator::get_busy_status () const
 119 {
 120   /*
 121     We have to use both the event and the busyGrobs queue.  The
 122     busyGrobs queue doesn't contain any notes that have started this
 123     instant.  */
 124   if (try_music (busy_req))
 125     return true;
 126
 127   Translator_group * tr = music_iter_->get_outlet ();
 128
 129   SCM grobs = tr->get_property ("busyGrobs");
 130   Moment now = tr->now_mom();
 131   for (; gh_pair_p (grobs); grobs = gh_cdr (grobs))
 132     {
 133       SCM grob = gh_cdar (grobs);
 134       Moment end  =*unsmob_moment (gh_caar (grobs));
 135
 136
 137       /*
 138         This is slightly ugh: we are now confunding the frontend
 139         (iterators) and the backend (note heads) */
 140       if (end > now
 141           && Note_head::has_interface (unsmob_grob (grob)))
 142         return true;
 143     }
 144
 145   return false;
 146 }
 147
 148
 149 bool
 150 Lyric_combine_music_iterator::melisma_busy ()
 151 {
 152   /*
 153     We can not read the property, since music_iter_->get_outlet () might
 154     not be the context that sets the melisma properties, but rather a
 155     parent context.
 156    */
 157   return music_iter_->try_music (melisma_playing_req);
 158 }
 159
 160 void
 161 Lyric_combine_music_iterator::process (Moment m)
 162 {
 163   Moment my_next = music_iter_->pending_moment ();
 164   if (my_next > m)
 165     return;
 166
 167   music_iter_->process (m);
 168
 169   if (get_busy_status () && !melisma_busy () && lyric_iter_->ok ())
 170     {
 171       Moment m= lyric_iter_->pending_moment ();
 172       lyric_iter_->process (m);
 173     }
 174 }
 175
 176 void
 177 Lyric_combine_music_iterator::do_quit ()
 178 {
 179   if (music_iter_)
 180     music_iter_->quit();
 181   if (lyric_iter_)
 182     lyric_iter_->quit();
 183 }
 184
 185 Music_iterator*
 186 Lyric_combine_music_iterator::try_music_in_children (Music *m) const
 187 {
 188   Music_iterator * i =  music_iter_->try_music (m);
 189   if (i)
 190     return i;
 191   else
 192     return lyric_iter_->try_music (m);
 193 }
 194
 195
 196 IMPLEMENT_CTOR_CALLBACK (Lyric_combine_music_iterator);