/*
- timing-grav.cc -- implement Timing_engraver
+ timing-engraver.cc -- implement Timing_engraver
source file of the GNU LilyPond music typesetter
- (c) 1997--1999 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 "context.hh"
#include "multi-measure-rest.hh"
+#include "timing-translator.hh"
+#include "engraver.hh"
+#include "grob.hh"
+/**
+ Do time bookkeeping
+ */
+class Timing_engraver : public Timing_translator, public Engraver
+{
+protected:
+ /* Needed to know whether we're advancing in grace notes, or not. */
+ Moment last_moment_;
+
+ virtual void start_translation_timestep ();
+ virtual void initialize ();
+ virtual void process_music();
+ virtual void stop_translation_timestep ();
+public:
+ TRANSLATOR_DECLARATIONS (Timing_engraver);
+};
-ADD_THIS_TRANSLATOR(Timing_engraver);
+
+Timing_engraver::Timing_engraver ()
+{
+ last_moment_.main_part_ = Rational (-1);
+}
void
-Timing_engraver::do_post_move_processing( )
+Timing_engraver::initialize ()
{
- bar_req_l_ = 0;
- Timing_translator::do_post_move_processing ();
+ Timing_translator::initialize ();
+
+ SCM which = get_property ("whichBar");
+ Moment now = now_mom ();
+
+ /* Set the first bar of the score? */
+ if (!scm_is_string (which))
+ which = (now.main_part_ || now.main_part_ == last_moment_.main_part_)
+ ? SCM_EOL : scm_makfrom0str ("|");
+
+ context ()->set_property ("whichBar", which);
}
-bool
-Timing_engraver::do_try_music (Music*m)
+void
+Timing_engraver::process_music()
{
- if (Bar_req * b= dynamic_cast <Bar_req *> (m))
+ 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)
{
- if (bar_req_l_ && bar_req_l_->equal_b (b)) // huh?
- return false;
-
- bar_req_l_ = b;
- return true;
+ Moment mlen = Moment (measure_length ());
+ unsmob_grob (get_property ("currentCommandColumn"))
+ ->set_property ("measure-length", mlen.smobbed_copy ());
}
-
- return Timing_translator::do_try_music (m);
}
+
-
-String
-Timing_engraver::which_bar ()
+void
+Timing_engraver::start_translation_timestep ()
{
- if (!bar_req_l_)
+ 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))
{
- if (!now_mom ())
- return "|";
+ SCM always = get_property ("barAlways");
- SCM nonauto = get_property ("barNonAuto", 0);
- if (!gh_boolean_p (nonauto) && gh_scm2bool (nonauto))
+ if ( start_of_measure || (to_boolean (always)))
{
- SCM always = get_property ("barAlways", 0);
- if (!measure_position ()
- || (gh_boolean_p (always) && gh_scm2bool (always)))
- {
- SCM def=get_property ("defaultBarType" ,0);
- return (gh_string_p (def))? ly_scm2string (def) : "";
- }
+ /* should this work, or be junked? See input/bugs/no-bars.ly */
+ which = get_property ("defaultBarType");
}
- return "";
- }
- else
- {
- return bar_req_l_->type_str_;
}
+
+ context ()->set_property ("whichBar", which);
}
+
+void
+Timing_engraver::stop_translation_timestep ()
+{
+ Timing_translator::stop_translation_timestep ();
+ context ()->set_property ("whichBar", SCM_EOL);
+ last_moment_ = now_mom ();
+}
+
+
+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 */ "");