2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2014 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 "engraver-group.hh"
23 #include "international.hh"
26 #include "stream-event.hh"
27 #include "time-signature.hh"
30 #include "translator.icc"
33 generate time_signatures.
35 class Time_signature_engraver : public Engraver
37 Item *time_signature_;
38 SCM last_time_fraction_;
42 virtual void derived_mark () const;
43 void stop_translation_timestep ();
44 void process_music ();
46 TRANSLATOR_DECLARATIONS (Time_signature_engraver);
47 DECLARE_TRANSLATOR_LISTENER (time_signature);
51 Time_signature_engraver::derived_mark () const
53 scm_gc_mark (last_time_fraction_);
54 scm_gc_mark (time_cause_);
57 Time_signature_engraver::Time_signature_engraver ()
60 time_cause_ = SCM_EOL;
61 last_time_fraction_ = SCM_BOOL_F;
64 IMPLEMENT_TRANSLATOR_LISTENER (Time_signature_engraver, time_signature);
66 Time_signature_engraver::listen_time_signature (Stream_event *ev)
68 time_cause_ = ev->self_scm ();
72 Time_signature_engraver::process_music ()
77 SCM fr = get_property ("timeSignatureFraction");
78 if (last_time_fraction_ != fr
81 time_signature_ = make_item ("TimeSignature", time_cause_);
82 time_signature_->set_property ("fraction", fr);
84 // Todo: "implicit" does not seem perfectly accurate (issue 4151)
85 if (last_time_fraction_ == SCM_BOOL_F)
86 time_signature_->set_property ("break-visibility",
87 get_property ("implicitTimeSignatureVisibility"));
89 int den = scm_to_int (scm_cdr (fr));
90 if (den != (1 << intlog2 (den)))
93 Todo: should make typecheck?
95 OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
97 time_signature_->warning (_f ("strange time signature found: %d/%d",
98 int (scm_to_int (scm_car (fr))),
102 last_time_fraction_ = fr;
107 Time_signature_engraver::stop_translation_timestep ()
109 if (time_signature_ && (time_cause_ != SCM_EOL))
111 Moment *mp = Moment::unsmob (get_property ("measurePosition"));
112 if (mp && (mp->main_part_ > Rational (0))
113 && !to_boolean (get_property ("partialBusy")))
114 time_signature_->warning ("mid-measure time signature without \\partial");
118 time_cause_ = SCM_EOL;
121 #include "translator.icc"
123 ADD_TRANSLATOR (Time_signature_engraver,
125 "Create a @ref{TimeSignature} whenever"
126 " @code{timeSignatureFraction} changes.",
132 "implicitTimeSignatureVisibility "
134 "timeSignatureFraction ",