lily/lyric-combine-music-iterator.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "dispatcher.hh"
  21 #include "global-context.hh"
  22 #include "grob.hh"
  23 #include "input.hh"
  24 #include "international.hh"
  25 #include "listener.hh"
  26 #include "music-iterator.hh"
  27 #include "music.hh"
  28
  29 /*
  30   This iterator is hairy.  It tracks both lyric and melody contexts,
  31   and has a complicated communication route, reading/writing
  32   properties in both.
  33
  34   In the future, this should rather be done with
  35
  36      \interpretAsMelodyFor { MUSIC } { LYRICS LYRICS LYRICS }
  37
  38   This can run an interpret step on MUSIC, generating a stream.  Then
  39   the stream can be perused at leisure to apply durations to all of
  40   the LYRICS.
  41 */
  42
  43 class Lyric_combine_music_iterator : public Music_iterator
  44 {
  45 public:
  46   Lyric_combine_music_iterator ();
  47   Lyric_combine_music_iterator (Lyric_combine_music_iterator const &src);
  48   DECLARE_SCHEME_CALLBACK (constructor, ());
  49 protected:
  50   virtual void construct_children ();
  51   virtual Moment pending_moment () const;
  52   virtual void do_quit ();
  53   virtual void process (Moment);
  54   virtual bool run_always ()const;
  55   virtual bool ok () const;
  56   virtual void derived_mark () const;
  57   virtual void derived_substitute (Context *, Context *);
  58   void set_music_context (Context *to);
  59 private:
  60   bool start_new_syllable () const;
  61   Context *find_voice ();
  62   DECLARE_LISTENER (set_busy);
  63   DECLARE_LISTENER (check_new_context);
  64
  65   bool music_found_;
  66   Context *lyrics_context_;
  67   Context *music_context_;
  68   SCM lyricsto_voice_name_;
  69
  70   Moment busy_moment_;
  71   Moment pending_grace_moment_;
  72
  73   Music_iterator *lyric_iter_;
  74 };
  75
  76 Lyric_combine_music_iterator::Lyric_combine_music_iterator ()
  77 {
  78   music_found_ = false;
  79   pending_grace_moment_.set_infinite (1);
  80   lyric_iter_ = 0;
  81   music_context_ = 0;
  82   lyrics_context_ = 0;
  83   busy_moment_.set_infinite (-1);
  84 }
  85
  86
  87 /*
  88   It's dubious whether we can ever make this fully work.  Due to
  89   associatedVoice switching, this routine may be triggered for
  90   the wrong music_context_
  91  */
  92 IMPLEMENT_LISTENER (Lyric_combine_music_iterator, set_busy)
  93 void
  94 Lyric_combine_music_iterator::set_busy (SCM se)
  95 {
  96   Stream_event *e = unsmob_stream_event (se);
  97
  98   if ((e->in_event_class ("note-event") || e->in_event_class ("cluster-note-event"))
  99       && music_context_)
 100
 101     busy_moment_ = max (music_context_->now_mom (),
 102                         busy_moment_);
 103
 104 }
 105
 106 void
 107 Lyric_combine_music_iterator::set_music_context (Context *to)
 108 {
 109   if (music_context_)
 110     {
 111       music_context_->event_source ()->
 112         remove_listener (GET_LISTENER (set_busy), ly_symbol2scm ("music-event"));
 113     }
 114
 115   music_context_ = to;
 116   if (to)
 117     {
 118       to->event_source ()->add_listener (GET_LISTENER (set_busy),
 119                                          ly_symbol2scm ("music-event"));
 120     }
 121 }
 122
 123 bool
 124 Lyric_combine_music_iterator::start_new_syllable () const
 125 {
 126   if (busy_moment_ < music_context_->now_mom ())
 127     return false;
 128
 129   if (!lyrics_context_)
 130     return false;
 131
 132   if (!to_boolean (lyrics_context_->get_property ("ignoreMelismata")))
 133     {
 134       bool m = melisma_busy (music_context_);
 135       if (m)
 136         return false;
 137     }
 138
 139   return true;
 140 }
 141
 142 Moment
 143 Lyric_combine_music_iterator::pending_moment () const
 144 {
 145   Moment m;
 146
 147   m.set_infinite (1);
 148
 149   return m;
 150 }
 151
 152 bool
 153 Lyric_combine_music_iterator::run_always () const
 154 {
 155   return true;
 156 }
 157
 158 bool
 159 Lyric_combine_music_iterator::ok () const
 160 {
 161   return lyric_iter_ && lyric_iter_->ok ();
 162 }
 163
 164 void
 165 Lyric_combine_music_iterator::derived_mark ()const
 166 {
 167   if (lyric_iter_)
 168     scm_gc_mark (lyric_iter_->self_scm ());
 169   if (lyrics_context_)
 170     scm_gc_mark (lyrics_context_->self_scm ());
 171   if (music_context_)
 172     scm_gc_mark (music_context_->self_scm ());
 173 }
 174
 175 void
 176 Lyric_combine_music_iterator::derived_substitute (Context *f, Context *t)
 177 {
 178   if (lyric_iter_)
 179     lyric_iter_->substitute_outlet (f, t);
 180   if (lyrics_context_ && lyrics_context_ == f)
 181     lyrics_context_ = t;
 182   if (music_context_ && music_context_ == f)
 183     set_music_context (t);
 184 }
 185
 186 void
 187 Lyric_combine_music_iterator::construct_children ()
 188 {
 189   Music *m = unsmob_music (get_music ()->get_property ("element"));
 190   lyric_iter_ = unsmob_iterator (get_iterator (m));
 191   if (!lyric_iter_)
 192     return;
 193   lyrics_context_ = find_context_below (lyric_iter_->get_outlet (),
 194                                         ly_symbol2scm ("Lyrics"), "");
 195
 196   if (!lyrics_context_)
 197     {
 198       m->origin ()->warning ("argument of \\lyricsto should contain Lyrics context");
 199     }
 200
 201   lyricsto_voice_name_ = get_music ()->get_property ("associated-context");
 202
 203   Context *voice = find_voice ();
 204   if (voice)
 205     set_music_context (voice);
 206
 207   /*
 208     Wait for a Create_context event. If this isn't done, lyrics can be
 209     delayed when voices are created implicitly.
 210   */
 211   Global_context *g = get_outlet ()->get_global_context ();
 212   g->events_below ()->add_listener (GET_LISTENER (check_new_context), ly_symbol2scm ("CreateContext"));
 213
 214   /*
 215     We do not create a Lyrics context, because the user might
 216     create one with a different name, and then we will not find that
 217     one.
 218   */
 219 }
 220
 221 IMPLEMENT_LISTENER (Lyric_combine_music_iterator, check_new_context)
 222 void
 223 Lyric_combine_music_iterator::check_new_context (SCM sev)
 224 {
 225   if (!ok ())
 226     return ;
 227
 228   // TODO: Check first if type=Voice and if id matches
 229   Stream_event * ev = unsmob_stream_event (sev);
 230   if (ev->get_property ("type") != ly_symbol2scm ("Voice"))
 231     return ;
 232
 233   Context *voice = find_voice ();
 234
 235   if (voice)
 236     {
 237       set_music_context (voice);
 238     }
 239 }
 240
 241 /*
 242   Look for a suitable voice to align lyrics to.
 243
 244   Returns 0 if nothing should change; i.e., if we already listen to the
 245   right voice, or if we don't yet listen to a voice but no appropriate
 246   voice could be found.
 247 */
 248 Context *
 249 Lyric_combine_music_iterator::find_voice ()
 250 {
 251   SCM voice_name = lyricsto_voice_name_;
 252   SCM running = lyrics_context_
 253     ? lyrics_context_->get_property ("associatedVoice")
 254     : SCM_EOL;
 255
 256   if (scm_is_string (running))
 257     voice_name = running;
 258
 259   if (scm_is_string (voice_name)
 260       && (!music_context_ || ly_scm2string (voice_name) != music_context_->id_string ()))
 261     {
 262       Context *t = get_outlet ();
 263       while (t && t->get_parent_context ())
 264         t = t->get_parent_context ();
 265
 266       string name = ly_scm2string (voice_name);
 267       return find_context_below (t, ly_symbol2scm ("Voice"), name);
 268     }
 269
 270   return 0;
 271 }
 272
 273 void
 274 Lyric_combine_music_iterator::process (Moment /* when */)
 275 {
 276   /* see if associatedVoice has been changed */
 277   Context *new_voice = find_voice ();
 278   if (new_voice)
 279     set_music_context (new_voice);
 280
 281   if (!music_context_)
 282     return;
 283
 284   if (!music_context_->get_parent_context ())
 285     {
 286       /*
 287         The melody has died.
 288         We die too.
 289       */
 290       if (lyrics_context_)
 291         lyrics_context_->unset_property (ly_symbol2scm ("associatedVoiceContext"));
 292       lyric_iter_ = 0;
 293       set_music_context (0);
 294     }
 295
 296
 297   if (music_context_
 298       && (start_new_syllable () ||
 299           (busy_moment_ >= pending_grace_moment_))
 300       && lyric_iter_->ok ())
 301     {
 302       Moment now = music_context_->now_mom ();
 303       if (now.grace_part_)
 304         {
 305           pending_grace_moment_ = now;
 306           pending_grace_moment_.grace_part_ = Rational (0);
 307           return;
 308         }
 309       else
 310         {
 311           pending_grace_moment_.set_infinite (1);
 312         }
 313
 314       Moment m = lyric_iter_->pending_moment ();
 315       lyrics_context_->set_property (ly_symbol2scm ("associatedVoiceContext"),
 316                                      music_context_->self_scm ());
 317       lyric_iter_->process (m);
 318
 319       music_found_ = true;
 320     }
 321
 322   new_voice = find_voice ();
 323   if (new_voice)
 324     set_music_context (new_voice);
 325 }
 326
 327 void
 328 Lyric_combine_music_iterator::do_quit ()
 329 {
 330   if (!music_found_)
 331     {
 332       SCM voice_name = get_music ()->get_property ("associated-context");
 333
 334       string name;
 335       if (scm_is_string (voice_name))
 336         name = ly_scm2string (voice_name);
 337
 338       get_music ()->origin ()->warning (_f ("cannot find Voice `%s'",
 339                                             name.c_str ()) + "\n");
 340     }
 341
 342   if (lyric_iter_)
 343     lyric_iter_->quit ();
 344 }
 345
 346 IMPLEMENT_CTOR_CALLBACK (Lyric_combine_music_iterator);