2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
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/>.
20 #include "global-context.hh"
25 #include "context-def.hh"
26 #include "dispatcher.hh"
27 #include "international.hh"
28 #include "music-iterator.hh"
30 #include "output-def.hh"
33 Global_context::Global_context (Output_def *o)
37 definition_ = find_context_def (o, ly_symbol2scm ("Global"));
39 now_mom_.set_infinite (-1);
40 prev_mom_.set_infinite (-1);
42 /* We only need the most basic stuff to bootstrap the context tree */
43 event_source ()->add_listener (GET_LISTENER (create_context_from_event),
44 ly_symbol2scm ("CreateContext"));
45 event_source ()->add_listener (GET_LISTENER (prepare),
46 ly_symbol2scm ("Prepare"));
47 events_below ()->register_as_listener (event_source_);
49 Context_def *globaldef = unsmob_context_def (definition_);
51 programming_error ("no `Global' context found");
53 globaldef->apply_default_property_operations (this);
55 SCM p = get_property ("EventClasses");
57 ancestor_lookup_ = scm_make_hash_table (scm_length (p));
58 for (;scm_is_pair (p); p = scm_cdr (p))
59 scm_hashq_set_x (ancestor_lookup_, scm_caar (p), scm_car (p));
61 accepts_list_ = scm_list_1 (ly_symbol2scm ("Score"));
65 Global_context::get_output_def () const
71 Global_context::add_moment_to_process (Moment m)
74 programming_error ("trying to freeze in time");
76 for (vsize i = 0; i < extra_mom_pq_.size (); i++)
77 if (extra_mom_pq_[i] == m)
79 extra_mom_pq_.insert (m);
83 Global_context::sneaky_insert_extra_moment (Moment w)
85 while (extra_mom_pq_.size () && extra_mom_pq_.front () <= w)
86 w = extra_mom_pq_.get ();
91 Global_context::get_moments_left () const
93 return extra_mom_pq_.size ();
96 IMPLEMENT_LISTENER (Global_context, prepare);
98 Global_context::prepare (SCM sev)
100 Stream_event *ev = unsmob_stream_event (sev);
101 Moment *mom = unsmob_moment (ev->get_property ("moment"));
105 if (prev_mom_.main_part_.is_infinity () && prev_mom_ < 0)
108 prev_mom_ = now_mom_;
113 Global_context::now_mom () const
119 Global_context::get_score_context () const
121 return (scm_is_pair (context_list_))
122 ? unsmob_context (scm_car (context_list_))
127 Global_context::get_output ()
129 Context *c = get_score_context ();
131 return c->get_property ("output");
137 Global_context::run_iterator_on_me (Music_iterator *iter)
139 prev_mom_.set_infinite (-1);
140 now_mom_.set_infinite (-1);
141 Moment final_mom = iter->get_music ()->get_length ();
144 while (iter->ok () || get_moments_left ())
149 w = iter->pending_moment ();
151 w = sneaky_insert_extra_moment (w);
152 if (w.main_part_.is_infinity () || w > final_mom)
157 programming_error ("Moment is not increasing. Aborting interpretation.");
164 Need this to get grace notes at start of a piece correct.
167 set_property ("measurePosition", w.smobbed_copy ());
170 send_stream_event (this, "Prepare", 0,
171 ly_symbol2scm ("moment"), w.smobbed_copy ());
176 send_stream_event (this, "OneTimeStep", 0, 0);
177 apply_finalizations ();
183 Global_context::apply_finalizations ()
185 SCM lst = get_property ("finalizations");
186 set_property ("finalizations", SCM_EOL);
187 for (SCM s = lst; scm_is_pair (s); s = scm_cdr (s))
189 /* TODO: make safe. */
190 scm_primitive_eval (scm_car (s));
193 /* Add a function to execute before stepping to the next time step. */
195 Global_context::add_finalization (SCM x)
197 SCM lst = get_property ("finalizations");
198 lst = scm_cons (x, lst);
199 set_property ("finalizations", lst);
203 Global_context::previous_moment () const
209 Global_context::get_default_interpreter (string /* context_id */)
211 if (get_score_context ())
212 return get_score_context ()->get_default_interpreter ();
214 return Context::get_default_interpreter ();
218 unsmob_global_context (SCM x)
220 return dynamic_cast<Global_context *> (unsmob_context (x));