lily/new-lyric-combine-music-iterator.cc

   1 /*
   2   new-lyric-combine-iterator.cc -- implement Lyric_combine_music_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2004--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "context.hh"
  10 #include "music.hh"
  11 #include "grob.hh"
  12 #include "music-iterator.hh"
  13 #include "input.hh"
  14
  15 class Lyric_combine_music_iterator : public Music_iterator
  16 {
  17 public:
  18   Lyric_combine_music_iterator ();
  19   Lyric_combine_music_iterator (Lyric_combine_music_iterator const &src);
  20   DECLARE_SCHEME_CALLBACK (constructor, ());
  21 protected:
  22   virtual void construct_children ();
  23   virtual Moment pending_moment () const;
  24   virtual void do_quit ();
  25   virtual void process (Moment);
  26   virtual Music_iterator *try_music_in_children (Music *) const;
  27   virtual bool run_always ()const;
  28   virtual bool ok () const;
  29   virtual void derived_mark () const;
  30   virtual void derived_substitute (Context *, Context *);
  31 private:
  32   bool start_new_syllable ();
  33   void find_voice ();
  34
  35   bool music_found_;
  36   bool made_association_;
  37   Context *lyrics_context_;
  38   Context *music_context_;
  39   SCM lyricsto_voice_name_;
  40
  41   Music_iterator *lyric_iter_;
  42 };
  43
  44 /*
  45   Ugh, why static?
  46 */
  47 static Music *busy_ev;
  48 static Music *start_ev;
  49 static Music *melisma_playing_ev;
  50
  51 Lyric_combine_music_iterator::Lyric_combine_music_iterator ()
  52 {
  53   music_found_ = false;
  54   made_association_ = false;
  55   lyric_iter_ = 0;
  56   music_context_ = 0;
  57   lyrics_context_ = 0;
  58
  59   /*
  60     Ugh. out of place here.
  61   */
  62   if (!busy_ev)
  63     {
  64       busy_ev
  65         = make_music_by_name (ly_symbol2scm ("BusyPlayingEvent"));
  66       start_ev
  67         = make_music_by_name (ly_symbol2scm ("StartPlayingEvent"));
  68       melisma_playing_ev
  69         = make_music_by_name (ly_symbol2scm ("MelismaPlayingEvent"));
  70     }
  71 }
  72
  73 bool
  74 Lyric_combine_music_iterator::start_new_syllable ()
  75 {
  76   bool b = music_context_->try_music (busy_ev);
  77
  78   if (!b)
  79     return false;
  80
  81   if (!lyrics_context_)
  82     return false;
  83
  84   if (!to_boolean (lyrics_context_->get_property ("ignoreMelismata")))
  85     {
  86       bool m = music_context_->try_music (melisma_playing_ev);
  87       if (m)
  88         return false;
  89     }
  90
  91   return true;
  92 }
  93
  94 Moment
  95 Lyric_combine_music_iterator::pending_moment () const
  96 {
  97   Moment m;
  98
  99   m.set_infinite (1);
 100
 101   return m;
 102 }
 103
 104 bool
 105 Lyric_combine_music_iterator::run_always () const
 106 {
 107   return true;
 108 }
 109
 110 bool
 111 Lyric_combine_music_iterator::ok () const
 112 {
 113   return lyric_iter_ && lyric_iter_->ok ();
 114 }
 115
 116 void
 117 Lyric_combine_music_iterator::derived_mark ()const
 118 {
 119   if (lyric_iter_)
 120     scm_gc_mark (lyric_iter_->self_scm ());
 121   if (lyrics_context_)
 122     scm_gc_mark (lyrics_context_->self_scm ());
 123   if (music_context_)
 124     scm_gc_mark (music_context_->self_scm ());
 125 }
 126
 127 void
 128 Lyric_combine_music_iterator::derived_substitute (Context *f, Context *t)
 129 {
 130   if (lyric_iter_)
 131     lyric_iter_->substitute_outlet (f, t);
 132   if (lyrics_context_ && lyrics_context_ == f)
 133     lyrics_context_ = t;
 134   if (music_context_ && music_context_ == f)
 135     music_context_ = t;
 136 }
 137
 138 void
 139 Lyric_combine_music_iterator::construct_children ()
 140 {
 141   Music *m = unsmob_music (get_music ()->get_property ("element"));
 142   lyric_iter_ = unsmob_iterator (get_iterator (m));
 143
 144   lyricsto_voice_name_ = get_music ()->get_property ("associated-context");
 145
 146   find_voice ();
 147
 148   if (lyric_iter_)
 149     lyrics_context_ = find_context_below (lyric_iter_->get_outlet (),
 150                                           ly_symbol2scm ("Lyrics"), "");
 151
 152   /*
 153     We do not create a Lyrics context, because the user might
 154     create one with a different name, and then we will not find that
 155     one.
 156   */
 157 }
 158
 159 void
 160 Lyric_combine_music_iterator::find_voice ()
 161 {
 162   SCM voice_name = lyricsto_voice_name_;
 163   SCM running = lyrics_context_
 164     ? lyrics_context_->get_property ("associatedVoice")
 165     : SCM_EOL;
 166
 167   if (scm_is_string (running))
 168     voice_name = running;
 169
 170   if (scm_is_string (voice_name)
 171       && (!music_context_ || ly_scm2string (voice_name) != music_context_->id_string ()))
 172     {
 173       /*
 174         (spaghettini).
 175
 176         Need to set associatedVoiceContext again
 177       */
 178       if (music_context_)
 179         made_association_ = false;
 180
 181       Context *t = get_outlet ();
 182       while (t && t->get_parent_context ())
 183         t = t->get_parent_context ();
 184
 185       String name = ly_scm2string (voice_name);
 186       Context *voice = find_context_below (t, ly_symbol2scm ("Voice"), name);
 187
 188       if (voice)
 189         music_context_ = voice;
 190     }
 191
 192   if (lyrics_context_ && music_context_)
 193     {
 194       if (!made_association_)
 195         {
 196           made_association_ = true;
 197           lyrics_context_->set_property ("associatedVoiceContext",
 198                                          music_context_->self_scm ());
 199         }
 200     }
 201 }
 202
 203 void
 204 Lyric_combine_music_iterator::process (Moment)
 205 {
 206   find_voice ();
 207   if (!music_context_)
 208     return;
 209
 210   if (!music_context_->get_parent_context ())
 211     {
 212       /*
 213         The melody has died.
 214         We die too.
 215       */
 216       if (lyrics_context_)
 217         lyrics_context_->unset_property (ly_symbol2scm ("associatedVoiceContext"));
 218       lyric_iter_ = 0;
 219       music_context_ = 0;
 220     }
 221
 222   if (music_context_
 223       && start_new_syllable () && lyric_iter_->ok ())
 224     {
 225       Moment m = lyric_iter_->pending_moment ();
 226       lyric_iter_->process (m);
 227
 228       music_found_ = true;
 229     }
 230 }
 231
 232 void
 233 Lyric_combine_music_iterator::do_quit ()
 234 {
 235   if (!music_found_)
 236     {
 237       SCM voice_name = get_music ()->get_property ("associated-context");
 238
 239       String name;
 240       if (scm_is_string (voice_name))
 241         name = ly_scm2string (voice_name);
 242
 243       get_music ()->origin ()->warning (_f ("cannot find Voice `%s'",
 244                                             name.to_str0 ()) + "\n");
 245     }
 246
 247   if (lyric_iter_)
 248     lyric_iter_->quit ();
 249 }
 250
 251 Music_iterator *
 252 Lyric_combine_music_iterator::try_music_in_children (Music *m) const
 253 {
 254   return lyric_iter_->try_music (m);
 255 }
 256
 257 IMPLEMENT_CTOR_CALLBACK (Lyric_combine_music_iterator);