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   VIRTUAL_COPY_CONS (Music_iterator);
  21   Lyric_combine_music_iterator ();
  22   Lyric_combine_music_iterator (Lyric_combine_music_iterator const&src);
  23   DECLARE_SCHEME_CALLBACK(constructor, ());
  24 protected:
  25   virtual void construct_children ();
  26   virtual Moment pending_moment () const;
  27   virtual void do_quit();
  28   virtual void process (Moment);
  29   virtual Music_iterator *try_music_in_children (Music *) const;
  30
  31   virtual bool ok () const;
  32   virtual void derived_mark () const;
  33   virtual void derived_substitute (Translator_group*,Translator_group*) ;
  34 private:
  35   bool get_busy_status ()const ;
  36   bool melisma_busy ();
  37
  38   Music_iterator * music_iter_;
  39   Music_iterator * lyric_iter_;
  40 };
  41
  42
  43 bool
  44 melisma_busy (Translator* tr)
  45 {
  46   SCM melisma_properties = tr->get_property ("melismaBusyProperties");
  47   bool busy = false;
  48
  49   for (; gh_pair_p (melisma_properties);
  50        melisma_properties = gh_cdr (melisma_properties))
  51     busy = busy || to_boolean (tr->internal_get_property (gh_car (melisma_properties)));
  52
  53   return busy;
  54 }
  55
  56
  57
  58 /*
  59   Ugh, why static?
  60  */
  61 Music *busy_req;
  62 Music *melisma_playing_req;
  63
  64 Lyric_combine_music_iterator::Lyric_combine_music_iterator ()
  65 {
  66   music_iter_ =0;
  67   lyric_iter_ =0;
  68
  69   if (!busy_req)
  70     {
  71       busy_req
  72         = make_music_by_name (ly_symbol2scm ("BusyPlayingEvent"));
  73       melisma_playing_req
  74         = make_music_by_name (ly_symbol2scm ("MelismaPlayingEvent"));
  75     }
  76 }
  77
  78 Moment
  79 Lyric_combine_music_iterator::pending_moment () const
  80 {
  81   Moment musnext = music_iter_->pending_moment ();
  82   return musnext;
  83 }
  84
  85 bool
  86 Lyric_combine_music_iterator::ok () const
  87 {
  88   return music_iter_->ok ();
  89 }
  90
  91 void
  92 Lyric_combine_music_iterator::derived_mark()const
  93 {
  94   if (music_iter_)
  95     scm_gc_mark (music_iter_->self_scm());
  96   if (lyric_iter_)
  97     scm_gc_mark (lyric_iter_->self_scm());
  98 }
  99
 100 void
 101 Lyric_combine_music_iterator::derived_substitute (Translator_group*f,Translator_group* t)
 102 {
 103   if (music_iter_)
 104     music_iter_->substitute_outlet (f,t);
 105   if (lyric_iter_)
 106     lyric_iter_->substitute_outlet (f,t);
 107 }
 108
 109 void
 110 Lyric_combine_music_iterator::construct_children ()
 111 {
 112   Lyric_combine_music const * m = dynamic_cast<Lyric_combine_music const*> (get_music ());
 113
 114   music_iter_ = unsmob_iterator (get_iterator (m->get_music ()));
 115   lyric_iter_ = unsmob_iterator (get_iterator (m->get_lyrics ()));
 116 }
 117
 118 bool
 119 Lyric_combine_music_iterator::get_busy_status () const
 120 {
 121   /*
 122     We have to use both the event and the busyGrobs queue.  The
 123     busyGrobs queue doesn't contain any notes that have started this
 124     instant.  */
 125   if (try_music (busy_req))
 126     return true;
 127
 128   Translator_group * tr = music_iter_->get_outlet ();
 129
 130   SCM grobs = tr->get_property ("busyGrobs");
 131   Moment now = tr->now_mom();
 132   for (; gh_pair_p (grobs); grobs = gh_cdr (grobs))
 133     {
 134       SCM grob = gh_cdar (grobs);
 135       Moment end  =*unsmob_moment (gh_caar (grobs));
 136
 137
 138       /*
 139         This is slightly ugh: we are now confunding the frontend
 140         (iterators) and the backend (note heads) */
 141       if (end > now
 142           && Note_head::has_interface (unsmob_grob (grob)))
 143         return true;
 144     }
 145
 146   return false;
 147 }
 148
 149
 150 bool
 151 Lyric_combine_music_iterator::melisma_busy ()
 152 {
 153   /*
 154     We can not read the property, since music_iter_->get_outlet () might
 155     not be the context that sets the melisma properties, but rather a
 156     parent context.
 157    */
 158   return music_iter_->try_music (melisma_playing_req);
 159 }
 160
 161 void
 162 Lyric_combine_music_iterator::process (Moment m)
 163 {
 164   Moment my_next = music_iter_->pending_moment ();
 165   if (my_next > m)
 166     return;
 167
 168   music_iter_->process (m);
 169
 170   if (get_busy_status () && !melisma_busy () && lyric_iter_->ok ())
 171     {
 172       Moment m= lyric_iter_->pending_moment ();
 173       lyric_iter_->process (m);
 174     }
 175 }
 176
 177 void
 178 Lyric_combine_music_iterator::do_quit ()
 179 {
 180   if (music_iter_)
 181     music_iter_->quit();
 182   if (lyric_iter_)
 183     lyric_iter_->quit();
 184 }
 185
 186 Lyric_combine_music_iterator::Lyric_combine_music_iterator (Lyric_combine_music_iterator const & src)
 187     : Music_iterator (src)
 188 {
 189   lyric_iter_ = 0;
 190   music_iter_ = 0;
 191
 192   if (src.lyric_iter_)
 193     lyric_iter_ =  src.lyric_iter_->clone ();
 194   if (src.music_iter_)
 195     music_iter_ =  src.music_iter_->clone ();
 196
 197   if (lyric_iter_)
 198     scm_gc_unprotect_object (lyric_iter_->self_scm());
 199   if (music_iter_)
 200     scm_gc_unprotect_object (music_iter_->self_scm());
 201 }
 202
 203 Music_iterator*
 204 Lyric_combine_music_iterator::try_music_in_children (Music *m) const
 205 {
 206   Music_iterator * i =  music_iter_->try_music (m);
 207   if (i)
 208     return i;
 209   else
 210     return lyric_iter_->try_music (m);
 211 }
 212
 213
 214 IMPLEMENT_CTOR_CALLBACK (Lyric_combine_music_iterator);