''

[lilypond.git] / lily / timing-engraver.cc

diff --git a/lily/timing-engraver.cc b/lily/timing-engraver.cc
index 00965fe5823d8ac2bf759b353d8f0f51f6689d57..9a381cede41a4ba24e50fd4183b3d144179ef014 100644 (file)
--- a/lily/timing-engraver.cc
+++ b/lily/timing-engraver.cc
@@ -3,84 +3,98 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
-
-#include "score-engraver.hh"
-#include "timing-engraver.hh"
+#include "translator-group.hh"
 #include "command-request.hh"
-#include "score-element-info.hh"
+#include "grob-info.hh"
 #include "multi-measure-rest.hh"
+#include "timing-translator.hh"
+#include "engraver.hh"
+#include "grob.hh"
 
-ADD_THIS_TRANSLATOR(Timing_engraver);
-
-void
-Timing_engraver::do_post_move_processing( )
+/**
+  Do time bookkeeping
+ */
+class Timing_engraver : public Timing_translator, public Engraver
 {
-  bar_req_l_ = 0;
-  Timing_translator::do_post_move_processing ();
+protected:
+  /*
+    Needed to know whether we're advancing in grace notes, or not.
+   */
+  Moment last_moment_;
   
-}
+  virtual void start_translation_timestep ();
+  virtual void stop_translation_timestep ();
 
-bool
-Timing_engraver::do_try_music (Music*m)
+public:
+  TRANSLATOR_DECLARATIONS(Timing_engraver);
+};
+
+
+Timing_engraver::Timing_engraver ()
 {
-  if (Bar_req  * b= dynamic_cast <Bar_req *> (m))
-    {
-      if (bar_req_l_ && !bar_req_l_->equal_b (b)) // huh?
-       return false;
-      
-      bar_req_l_ = b;
-      return true;
-    }
-  
-  return Timing_translator::do_try_music (m);
+  last_moment_.main_part_ = Rational (-1);
 }
 
-#if 0
-String
-Timing_engraver::do_process_music ()
+
+
+void
+Timing_engraver::start_translation_timestep ()
 {
-  if (gh_string_p (get_property  ("barType")))
-    ;
-  else if (!now_mom ())
-    {
-      daddy_trans_l_->set_property ("barType", ly_str02scm ("|"));
-    }
-  else
+  Timing_translator::start_translation_timestep ();
 
-  {
-  }
-}
-#endif
+  SCM nonauto = get_property ("barNonAuto");
+  Moment now = now_mom ();
+  SCM which = get_property ("whichBar");
 
+  /*
+    Set the first bar of the score? 
+   */
+  if (!gh_string_p (which))
+    which
+      = (now.main_part_ || now.main_part_ == last_moment_.main_part_)
+      ? SCM_EOL : ly_str02scm ("|");
 
-/*
-  TODO make properties of this.
- */
-String
-Timing_engraver::which_bar ()
-{
-  if (!bar_req_l_)
+  Moment mp = measure_position ();
+  bool start_of_measure = (last_moment_.main_part_ != now.main_part_&& !mp.main_part_  );
+
+  if (start_of_measure)
     {
-      if (!now_mom ())
-       return "|";
+      Moment mlen = Moment(measure_length ());
+      unsmob_grob (get_property ("currentCommandColumn"))->set_grob_property ("measure-length", mlen.smobbed_copy()); 
+    }
+  
+  if (!gh_string_p (which) && !to_boolean (nonauto))
+    {
+      SCM always = get_property ("barAlways");
 
-      SCM nonauto = get_property ("barNonAuto");
-      if (!to_boolean (nonauto))
+      if ( start_of_measure || (to_boolean (always)))
        {
-         SCM always = get_property ("barAlways");
-         if (!measure_position ()
-             || (to_boolean (always)))
-           {
-             SCM def=get_property ("defaultBarType" );
-             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_;
     }
+
+  daddy_trans_l_->set_property ("whichBar", which);
+}
+
+void
+Timing_engraver::stop_translation_timestep ()
+{
+  Timing_translator::stop_translation_timestep ();
+  daddy_trans_l_->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}.",
+/* creats*/       "",
+/* acks  */       "",
+/* reads */       "timeSignatureFraction barCheckNoSynchronize barNonAuto whichBar barAlways defaultBarType skipBars timing oneBeat measureLength measurePosition currentBarNumber",
+/* write */       "");