X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Ftiming-engraver.cc;h=73e4f5561f1f84b4c413481f1a198dd8d4083650;hb=3548eacf9da6dddfdd5a9ca2dc15d055a0a9a5e2;hp=f6ddb5f9b3871b5ec1272727f33063e5648ea11d;hpb=615a9212789c2cb2994748c023d0e19f3a83a0fd;p=lilypond.git

diff --git a/lily/timing-engraver.cc b/lily/timing-engraver.cc
index f6ddb5f9b3..73e4f5561f 100644
--- a/lily/timing-engraver.cc
+++ b/lily/timing-engraver.cc
@@ -3,21 +3,127 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2004 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);
+};
+
+
+Timing_engraver::Timing_engraver ()
+{
+  last_moment_.main_part_ = Rational (-1);
+}
+
+
+void
+Timing_engraver::initialize ()
+{
+  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);
+}
+
+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 ());
+      unsmob_grob (get_property ("currentCommandColumn"))
+	->set_property ("measure-length", mlen.smobbed_copy ()); 
+    }
+}
+  
 
 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 || (to_boolean (always)))
+	{
+	  /* should this work, or be junked?  See input/bugs/no-bars.ly */
+	  which = get_property ("defaultBarType");
+	}
+    }
+
+  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 ();
+}
+
+
+ENTER_DESCRIPTION (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."
 
-ADD_THIS_TRANSLATOR(Timing_engraver);
+		   ,
+/* creats*/       "",
+/* accepts */     "",
+/* acks  */      "",
+/* reads */       "automaticBars whichBar barAlways defaultBarType skipBars timing measureLength measurePosition currentBarNumber",
+/* write */       "");