2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2004--2015 Han-Wen Nienhuys
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.
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.
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/>.
21 #include "dispatcher.hh"
22 #include "lily-guile.hh"
24 #include "music-iterator.hh"
25 #include "music-sequence.hh"
28 static const char *const CONTEXT_ONE = "one";
29 static const char *const CONTEXT_TWO = "two";
30 static const char *const CONTEXT_SHARED = "shared";
31 static const char *const CONTEXT_SOLO = "solo";
32 static const char *const CONTEXT_NULL = "null";
34 class Part_combine_iterator : public Music_iterator
37 Part_combine_iterator ();
39 DECLARE_SCHEME_CALLBACK (constructor, ());
41 virtual void derived_substitute (Context *f, Context *t);
42 virtual void derived_mark () const;
44 virtual void construct_children ();
45 virtual Moment pending_moment () const;
46 virtual void do_quit ();
47 virtual void process (Moment);
49 virtual bool ok () const;
52 static const size_t NUM_PARTS = 2;
53 Music_iterator *iterators_[NUM_PARTS];
58 Stream_event *mmrest_event_;
71 // For states in which it matters, this is the relevant part,
72 // e.g. 1 for Solo I, 2 for Solo II.
75 void substitute_one (Music_iterator *iter, const char *voice_id);
76 void substitute_both (const char *part1_voice_id, const char *part2_voice_id);
77 bool is_active_outlet (const Context *c) const;
78 void kill_mmrest (Context *c);
79 void chords_together ();
83 void unisono (bool silent, int newpart);
86 const size_t Part_combine_iterator::NUM_PARTS;
89 Part_combine_iterator::do_quit ()
91 for (size_t i = 0; i < NUM_PARTS; i++)
93 iterators_[i]->quit ();
96 Part_combine_iterator::Part_combine_iterator ()
100 for (size_t i = 0; i < NUM_PARTS; i++)
102 split_list_ = SCM_EOL;
108 Part_combine_iterator::derived_mark () const
110 for (size_t i = 0; i < NUM_PARTS; i++)
112 scm_gc_mark (iterators_[i]->self_scm ());
115 scm_gc_mark (mmrest_event_->self_scm ());
119 Part_combine_iterator::derived_substitute (Context *f,
122 // (Explain why just iterators_[0].)
124 iterators_[0]->substitute_outlet (f, t);
128 Part_combine_iterator::pending_moment () const
133 for (size_t i = 0; i < NUM_PARTS; i++)
134 if (iterators_[i]->ok ())
135 p = min (p, iterators_[i]->pending_moment ());
141 Part_combine_iterator::ok () const
143 for (size_t i = 0; i < NUM_PARTS; i++)
144 if (iterators_[i]->ok ())
151 Part_combine_iterator::substitute_one (Music_iterator *iter,
152 const char *voice_id)
154 Context *c = iter->get_outlet ();
157 programming_error ("no context");
160 c = c->get_parent_context ();
163 programming_error ("no parent context");
166 c = find_context_below (c, ly_symbol2scm("Voice"), voice_id);
169 string s = "can not find Voice context: ";
171 programming_error (s);
174 iter->substitute_outlet (iter->get_outlet (), c);
178 Part_combine_iterator::substitute_both (const char *part1_voice_id,
179 const char *part2_voice_id)
181 // TODO: There is no good reason to tie the parts together here.
182 // Factor out per-part stuff into a new class of iterator which
183 // reads a part-specific list similar to the existing combined
185 substitute_one(iterators_[0], part1_voice_id);
186 substitute_one(iterators_[1], part2_voice_id);
189 bool Part_combine_iterator::is_active_outlet (const Context *c) const
191 for (size_t i = 0; i < NUM_PARTS; i++)
192 if (iterators_[i] && (iterators_[i]->get_outlet () == c))
199 Part_combine_iterator::kill_mmrest (Context *c)
204 mmrest_event_ = new Stream_event
205 (scm_call_1 (ly_lily_module_constant ("ly:make-event-class"),
206 ly_symbol2scm ("multi-measure-rest-event")));
207 mmrest_event_->set_property ("duration", SCM_EOL);
208 mmrest_event_->unprotect ();
211 c->event_source ()->broadcast (mmrest_event_);
215 Part_combine_iterator::unisono (bool silent, int newpart)
217 Status newstate = (silent) ? UNISILENCE : UNISONO;
219 if ((newstate == state_) and (newpart == chosen_part_))
223 const char *c1 = (newpart == 2) ? CONTEXT_NULL : CONTEXT_SHARED;
224 const char *c2 = (newpart == 2) ? CONTEXT_SHARED : CONTEXT_NULL;
225 substitute_both (c1, c2);
228 chosen_part_ = newpart;
233 Part_combine_iterator::solo1 ()
235 if ((state_ == SOLO) && (chosen_part_ == 1))
241 substitute_both (CONTEXT_SOLO, CONTEXT_NULL);
246 Part_combine_iterator::solo2 ()
248 if ((state_ == SOLO) and (chosen_part_ == 2))
254 substitute_both (CONTEXT_NULL, CONTEXT_SOLO);
259 Part_combine_iterator::chords_together ()
261 if (state_ == TOGETHER)
267 substitute_both (CONTEXT_SHARED, CONTEXT_SHARED);
272 Part_combine_iterator::apart ()
279 substitute_both (CONTEXT_ONE, CONTEXT_TWO);
284 Part_combine_iterator::construct_children ()
286 start_moment_ = get_outlet ()->now_mom ();
287 split_list_ = get_music ()->get_property ("split-list");
289 SCM lst = get_music ()->get_property ("elements");
290 iterators_[0] = unsmob<Music_iterator> (get_iterator (unsmob<Music> (scm_car (lst))));
291 iterators_[1] = unsmob<Music_iterator> (get_iterator (unsmob<Music> (scm_cadr (lst))));
295 Part_combine_iterator::process (Moment m)
297 Moment now = get_outlet ()->now_mom ();
300 /* This is needed if construct_children was called before iteration
302 if (start_moment_.main_part_.is_infinity () && start_moment_ < 0)
305 Context *prev_active_outlets[NUM_PARTS];
306 for (size_t i = 0; i < NUM_PARTS; i++)
307 prev_active_outlets[i] = iterators_[i]->get_outlet ();
309 for (; scm_is_pair (split_list_); split_list_ = scm_cdr (split_list_))
311 splitm = unsmob<Moment> (scm_caar (split_list_));
312 if (splitm && *splitm + start_moment_ > now)
315 SCM tag = scm_cdar (split_list_);
317 if (scm_is_eq (tag, ly_symbol2scm ("chords")))
319 else if (scm_is_eq (tag, ly_symbol2scm ("apart"))
320 || scm_is_eq (tag, ly_symbol2scm ("apart-silence"))
321 || scm_is_eq (tag, ly_symbol2scm ("apart-spanner")))
323 else if (scm_is_eq (tag, ly_symbol2scm ("unisono")))
325 // Continue to use the most recently used part because we might have
326 // killed mmrests in the other part.
327 unisono (false, (chosen_part_ == 2) ? 2 : 1);
329 else if (scm_is_eq (tag, ly_symbol2scm ("unisilence")))
332 unisono (true, (chosen_part_ == 2) ? 2 : 1);
334 else if (scm_is_eq (tag, ly_symbol2scm ("silence1")))
336 else if (scm_is_eq (tag, ly_symbol2scm ("silence2")))
338 else if (scm_is_eq (tag, ly_symbol2scm ("solo1")))
340 else if (scm_is_eq (tag, ly_symbol2scm ("solo2")))
342 else if (scm_is_symbol (tag))
344 string s = "Unknown split directive: "
345 + (scm_is_symbol (tag) ? ly_symbol2string (tag) : string ("not a symbol"));
346 programming_error (s);
350 bool any_outlet_changed = false;
351 for (size_t i = 0; i < NUM_PARTS; i++)
353 if (iterators_[i]->ok ())
354 iterators_[i]->process (m);
356 if (prev_active_outlets[i] != iterators_[i]->get_outlet ())
357 any_outlet_changed = true;
360 if (any_outlet_changed)
362 // Kill multi-measure rests in outlets that were previously active and
363 // are no longer active.
364 for (size_t i = 0; i < NUM_PARTS; i++)
366 Context *c = prev_active_outlets[i];
367 if (c && !is_active_outlet (c))
373 IMPLEMENT_CTOR_CALLBACK (Part_combine_iterator);