/*
- timing-grav.cc -- implement Timing_engraver
+ timing-engraver.cc -- implement Timing_engraver
source file of the GNU LilyPond music typesetter
- (c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
-#include "score-engraver.hh"
-#include "timing-engraver.hh"
-#include "command-request.hh"
-#include "score-element-info.hh"
+
+#include "timing-translator.hh"
+#include "engraver.hh"
+
+#include "context.hh"
#include "multi-measure-rest.hh"
+#include "grob.hh"
+#include "warn.hh"
+
+
+class Timing_engraver : public Timing_translator, public Engraver
+{
+protected:
+ /* Need to know whether we're advancing in grace notes, or not. */
+ Moment last_moment_;
+
+ virtual void start_translation_timestep ();
+ virtual void process_music ();
+ virtual void stop_translation_timestep ();
+
+public:
+ TRANSLATOR_DECLARATIONS (Timing_engraver);
+};
+
+ADD_TRANSLATOR (Timing_engraver,
+ /* descr */ " Responsible for synchronizing timing information from staves. "
+ "Normally in @code{Score}. In order to create polyrhythmic music, "
+ "this engraver should be removed from @code{Score} and placed in "
+ "@code{Staff}. "
+ "\n\nThis engraver adds the alias @code{Timing} to its containing context.",
+ /* creats*/ "",
+ /* accepts */ "",
+ /* acks */ "",
+ /* reads */ "automaticBars whichBar barAlways defaultBarType "
+ "skipBars timing measureLength measurePosition currentBarNumber",
+ /* write */ "");
+
+
+Timing_engraver::Timing_engraver ()
+{
+ last_moment_.main_part_ = Rational (-1);
+}
+
+void
+Timing_engraver::process_music ()
+{
+ Timing_translator::process_music ();
+ bool start_of_measure = (last_moment_.main_part_ != now_mom ().main_part_
+ && !measure_position ().main_part_);
+
+ /*
+ We can't do this in start_translation_timestep(), since time sig
+ changes won't have happened by then.
+ */
+ if (start_of_measure)
+ {
+ Moment mlen = Moment (measure_length ());
+ Grob * column = unsmob_grob (get_property ("currentCommandColumn"));
+ if (column)
+ column->set_property ("measure-length", mlen.smobbed_copy ());
+ else
+ programming_error("No command column?");
+ }
+}
void
-Timing_engraver::fill_staff_info (Staff_info &inf)
+Timing_engraver::start_translation_timestep ()
{
- inf.time_C_ = &time_;
- inf.rhythmic_C_ = &default_grouping_;
+ Timing_translator::start_translation_timestep ();
+
+ SCM automatic_bars = get_property ("automaticBars");
+ Moment now = now_mom ();
+ SCM which = get_property ("whichBar");
+
+ /* Set the first bar of the score? */
+ if (!scm_is_string (which))
+ which = SCM_EOL;
+
+ Moment mp = measure_position ();
+ bool start_of_measure = (last_moment_.main_part_ != now.main_part_
+ && !mp.main_part_);
+
+ if (!scm_is_string (which) && to_boolean (automatic_bars))
+ {
+ SCM always = get_property ("barAlways");
+
+ if ((start_of_measure && last_moment_.main_part_ >= Moment (0))
+ || to_boolean (always))
+ {
+ /* should this work, or be junked? See input/bugs/no-bars.ly */
+ which = get_property ("defaultBarType");
+ }
+ }
+
+ context ()->set_property ("whichBar", which);
}
-IMPLEMENT_IS_TYPE_B1(Timing_engraver, Timing_translator);
-ADD_THIS_TRANSLATOR(Timing_engraver);
+void
+Timing_engraver::stop_translation_timestep ()
+{
+ Timing_translator::stop_translation_timestep ();
+ context ()->set_property ("whichBar", SCM_EOL);
+ last_moment_ = now_mom ();
+}