/*
- time_signature-reg.cc -- implement Time_signature_engraver
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-*/
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-#include "time-signature.hh"
-#include "command-request.hh"
-#include "engraver.hh"
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "engraver-group.hh"
-#include "engraver-group-engraver.hh"
+#include "item.hh"
+#include "international.hh"
+#include "misc.hh"
+#include "moment.hh"
+#include "stream-event.hh"
+#include "warn.hh"
+#include "translator.icc"
/**
- generate time_signatures.
- */
-class Time_signature_engraver : public Engraver {
+ generate time_signatures.
+*/
+class Time_signature_engraver : public Engraver
+{
+ Item *time_signature_;
+ SCM last_time_fraction_;
+ SCM time_cause_;
+
protected:
- virtual void do_pre_move_processing();
- virtual void process_acknowledged ();
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
public:
- VIRTUAL_COPY_CONS(Translator);
- Item * time_signature_p_;
- SCM last_time_fraction_;
- Time_signature_engraver();
+ TRANSLATOR_DECLARATIONS (Time_signature_engraver);
+ void listen_time_signature (Stream_event *);
};
+void
+Time_signature_engraver::derived_mark () const
+{
+ scm_gc_mark (last_time_fraction_);
+ scm_gc_mark (time_cause_);
+}
-Time_signature_engraver::Time_signature_engraver()
-{
- time_signature_p_ =0;
- last_time_fraction_ = SCM_EOL;
+Time_signature_engraver::Time_signature_engraver (Context *c)
+ : Engraver (c)
+{
+ time_signature_ = 0;
+ time_cause_ = SCM_EOL;
+ last_time_fraction_ = SCM_BOOL_F;
}
void
-Time_signature_engraver::process_acknowledged()
+Time_signature_engraver::listen_time_signature (Stream_event *ev)
{
- /*
- not rigorously safe, since the value might get GC'd and
- reallocated in the same spot */
- SCM fr= get_property ("timeSignatureFraction");
- if (last_time_fraction_ != fr)
- {
- last_time_fraction_ = fr;
- time_signature_p_ = new Item (get_property ("TimeSignature"));
- time_signature_p_->set_elt_property ("fraction",fr);
-
- if (time_signature_p_)
- announce_element (time_signature_p_, 0);
- }
-
+ time_cause_ = ev->self_scm ();
}
+void
+Time_signature_engraver::process_music ()
+{
+ if (time_signature_)
+ return;
+ SCM fr = get_property ("timeSignatureFraction");
+ if (!scm_is_eq (last_time_fraction_, fr) && scm_is_pair (fr))
+ {
+ time_signature_ = make_item ("TimeSignature", time_cause_);
+ time_signature_->set_property ("fraction", fr);
+
+ if (scm_is_false (last_time_fraction_))
+ time_signature_->set_property ("break-visibility",
+ get_property ("initialTimeSignatureVisibility"));
+
+ int den = scm_to_int (scm_cdr (fr));
+ if (den != (1 << intlog2 (den)))
+ {
+ /*
+ Todo: should make typecheck?
+
+ OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
+ */
+ time_signature_->warning (_f ("strange time signature found: %d/%d",
+ int (scm_to_int (scm_car (fr))),
+ den));
+ }
+
+ last_time_fraction_ = fr;
+ }
+}
void
-Time_signature_engraver::do_pre_move_processing()
+Time_signature_engraver::stop_translation_timestep ()
{
- if (time_signature_p_)
+ if (time_signature_ && !scm_is_null (time_cause_))
{
- typeset_element (time_signature_p_);
- time_signature_p_ =0;
+ Moment *mp = unsmob<Moment> (get_property ("measurePosition"));
+ if (mp && (mp->main_part_ > Rational (0))
+ && !to_boolean (get_property ("partialBusy")))
+ time_signature_->warning ("mid-measure time signature without \\partial");
}
+
+ time_signature_ = 0;
+ time_cause_ = SCM_EOL;
+}
+
+void
+Time_signature_engraver::boot ()
+{
+ ADD_LISTENER (Time_signature_engraver, time_signature);
}
+ADD_TRANSLATOR (Time_signature_engraver,
+ /* doc */
+ "Create a @ref{TimeSignature} whenever"
+ " @code{timeSignatureFraction} changes.",
+
+ /* create */
+ "TimeSignature ",
-ADD_THIS_TRANSLATOR(Time_signature_engraver);
-
+ /* read */
+ "initialTimeSignatureVisibility "
+ "partialBusy "
+ "timeSignatureFraction ",
+ /* write */
+ ""
+ );