2 new-lyric-combine-iterator.cc -- implement Lyric_combine_music_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "dispatcher.hh"
10 #include "global-context.hh"
13 #include "international.hh"
14 #include "listener.hh"
15 #include "music-iterator.hh"
19 This iterator is hairy. It tracks both lyric and melody contexts,
20 and has a complicated communication route, reading/writing
23 In the future, this should rather be done with
25 \interpretAsMelodyFor { MUSIC } { LYRICS LYRICS LYRICS }
27 This can run an interpret step on MUSIC, generating a stream. Then
28 the stream can be perused at leisure to apply durations to all of
32 class Lyric_combine_music_iterator : public Music_iterator
35 Lyric_combine_music_iterator ();
36 Lyric_combine_music_iterator (Lyric_combine_music_iterator const &src);
37 DECLARE_SCHEME_CALLBACK (constructor, ());
39 virtual void construct_children ();
40 virtual Moment pending_moment () const;
41 virtual void do_quit ();
42 virtual void process (Moment);
43 virtual bool run_always ()const;
44 virtual bool ok () const;
45 virtual void derived_mark () const;
46 virtual void derived_substitute (Context *, Context *);
47 void set_music_context (Context *to);
49 bool start_new_syllable () const;
50 Context *find_voice ();
51 DECLARE_LISTENER (set_busy);
52 DECLARE_LISTENER (check_new_context);
55 Context *lyrics_context_;
56 Context *music_context_;
57 SCM lyricsto_voice_name_;
60 Moment pending_grace_moment_;
62 Music_iterator *lyric_iter_;
65 Lyric_combine_music_iterator::Lyric_combine_music_iterator ()
68 pending_grace_moment_.set_infinite (1);
72 busy_moment_.set_infinite (-1);
77 It's dubious whether we can ever make this fully work. Due to
78 associatedVoice switching, this routine may be triggered for
79 the wrong music_context_
81 IMPLEMENT_LISTENER (Lyric_combine_music_iterator, set_busy)
83 Lyric_combine_music_iterator::set_busy (SCM se)
85 Stream_event *e = unsmob_stream_event (se);
87 if ((e->in_event_class ("note-event") || e->in_event_class ("cluster-note-event"))
90 busy_moment_ = max (music_context_->now_mom (),
96 Lyric_combine_music_iterator::set_music_context (Context *to)
100 music_context_->event_source ()->
101 remove_listener (GET_LISTENER (set_busy), ly_symbol2scm ("music-event"));
107 to->event_source ()->add_listener (GET_LISTENER (set_busy),
108 ly_symbol2scm ("music-event"));
113 Lyric_combine_music_iterator::start_new_syllable () const
115 if (busy_moment_ < music_context_->now_mom ())
118 if (!lyrics_context_)
121 if (!to_boolean (lyrics_context_->get_property ("ignoreMelismata")))
123 bool m = melisma_busy (music_context_);
132 Lyric_combine_music_iterator::pending_moment () const
142 Lyric_combine_music_iterator::run_always () const
148 Lyric_combine_music_iterator::ok () const
150 return lyric_iter_ && lyric_iter_->ok ();
154 Lyric_combine_music_iterator::derived_mark ()const
157 scm_gc_mark (lyric_iter_->self_scm ());
159 scm_gc_mark (lyrics_context_->self_scm ());
161 scm_gc_mark (music_context_->self_scm ());
165 Lyric_combine_music_iterator::derived_substitute (Context *f, Context *t)
168 lyric_iter_->substitute_outlet (f, t);
169 if (lyrics_context_ && lyrics_context_ == f)
171 if (music_context_ && music_context_ == f)
172 set_music_context (t);
176 Lyric_combine_music_iterator::construct_children ()
178 Music *m = unsmob_music (get_music ()->get_property ("element"));
179 lyric_iter_ = unsmob_iterator (get_iterator (m));
182 lyrics_context_ = find_context_below (lyric_iter_->get_outlet (),
183 ly_symbol2scm ("Lyrics"), "");
185 if (!lyrics_context_)
187 m->origin ()->warning ("argument of \\lyricsto should contain Lyrics context");
190 lyricsto_voice_name_ = get_music ()->get_property ("associated-context");
192 Context *voice = find_voice ();
194 set_music_context (voice);
197 Wait for a Create_context event. If this isn't done, lyrics can be
198 delayed when voices are created implicitly.
200 Global_context *g = get_outlet ()->get_global_context ();
201 g->events_below ()->add_listener (GET_LISTENER (check_new_context), ly_symbol2scm ("CreateContext"));
204 We do not create a Lyrics context, because the user might
205 create one with a different name, and then we will not find that
210 IMPLEMENT_LISTENER (Lyric_combine_music_iterator, check_new_context)
212 Lyric_combine_music_iterator::check_new_context (SCM sev)
217 // TODO: Check first if type=Voice and if id matches
218 Stream_event * ev = unsmob_stream_event (sev);
219 if (ev->get_property ("type") != ly_symbol2scm ("Voice"))
222 Context *voice = find_voice ();
226 set_music_context (voice);
231 Look for a suitable voice to align lyrics to.
233 Returns 0 if nothing should change; i.e., if we already listen to the
234 right voice, or if we don't yet listen to a voice but no appropriate
235 voice could be found.
238 Lyric_combine_music_iterator::find_voice ()
240 SCM voice_name = lyricsto_voice_name_;
241 SCM running = lyrics_context_
242 ? lyrics_context_->get_property ("associatedVoice")
245 if (scm_is_string (running))
246 voice_name = running;
248 if (scm_is_string (voice_name)
249 && (!music_context_ || ly_scm2string (voice_name) != music_context_->id_string ()))
251 Context *t = get_outlet ();
252 while (t && t->get_parent_context ())
253 t = t->get_parent_context ();
255 string name = ly_scm2string (voice_name);
256 return find_context_below (t, ly_symbol2scm ("Voice"), name);
263 Lyric_combine_music_iterator::process (Moment when)
267 /* see if associatedVoice has been changed */
268 Context *new_voice = find_voice ();
270 set_music_context (new_voice);
275 if (!music_context_->get_parent_context ())
282 lyrics_context_->unset_property (ly_symbol2scm ("associatedVoiceContext"));
284 set_music_context (0);
289 && (start_new_syllable () ||
290 (busy_moment_ >= pending_grace_moment_))
291 && lyric_iter_->ok ())
293 Moment now = music_context_->now_mom ();
296 pending_grace_moment_ = now;
297 pending_grace_moment_.grace_part_ = Rational (0);
302 pending_grace_moment_.set_infinite (1);
305 Moment m = lyric_iter_->pending_moment ();
306 lyrics_context_->set_property (ly_symbol2scm ("associatedVoiceContext"),
307 music_context_->self_scm ());
308 lyric_iter_->process (m);
313 new_voice = find_voice ();
315 set_music_context (new_voice);
319 Lyric_combine_music_iterator::do_quit ()
323 SCM voice_name = get_music ()->get_property ("associated-context");
326 if (scm_is_string (voice_name))
327 name = ly_scm2string (voice_name);
329 get_music ()->origin ()->warning (_f ("cannot find Voice `%s'",
330 name.c_str ()) + "\n");
334 lyric_iter_->quit ();
337 IMPLEMENT_CTOR_CALLBACK (Lyric_combine_music_iterator);