Editing.

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

diff --git a/lily/timing-engraver.cc b/lily/timing-engraver.cc
index 88a54c93b9912801d3ac5895ccb5d21c087aba05..1dd76bc42d394551138e5724a7a52d28b5fe7a3e 100644 (file)
--- a/lily/timing-engraver.cc
+++ b/lily/timing-engraver.cc
@@ -1,91 +1,108 @@
 /*
-  timing-grav.cc -- implement Timing_engraver
+  timing-engraver.cc -- implement Timing_engraver
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
-#include "translator-group.hh"
-#include "command-request.hh"
-#include "grob-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.
-   */
+  /* 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);
+  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 ());
+      unsmob_grob (get_property ("currentCommandColumn"))
+       ->set_property ("measure-length", mlen.smobbed_copy ());
+    }
+}
 
 void
 Timing_engraver::start_translation_timestep ()
 {
   Timing_translator::start_translation_timestep ();
 
-  SCM nonauto = get_property ("barNonAuto");
+  SCM automatic_bars = get_property ("automaticBars");
   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 ("|");
-  
-  if (!gh_string_p (which) && !to_boolean (nonauto))
+  /* 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");
-      Moment mp = measure_position ();
-      if ( (last_moment_.main_part_ != now.main_part_
-           && !mp.main_part_)
-          || (to_boolean (always)))
+
+      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");
        }
     }
 
-  daddy_trans_l_->set_property ("whichBar", which);
+  context ()->set_property ("whichBar", which);
 }
 
 void
 Timing_engraver::stop_translation_timestep ()
 {
   Timing_translator::stop_translation_timestep ();
-  daddy_trans_l_->set_property ("whichBar", SCM_EOL);
+  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}.",
-/* creats*/       "",
-/* acks  */       "",
-/* reads */       "timeSignatureFraction barCheckNoSynchronize barNonAuto whichBar barAlways defaultBarType skipBars timing oneBeat measureLength measurePosition currentBarNumber",
-/* write */       "");