Merge branch 'cvs-head' of ssh+git://hanwen@repo.or.cz/srv/git/lilypond into master...

[lilypond.git] / lily / time-scaled-music-iterator.cc

diff --git a/lily/time-scaled-music-iterator.cc b/lily/time-scaled-music-iterator.cc
index db0c669030e4c05fe1b2707df3be1c8a261bf78e..9ab2673eeb86a23a7694700e886f5b0a13242086 100644 (file)
--- a/lily/time-scaled-music-iterator.cc
+++ b/lily/time-scaled-music-iterator.cc
@@ -1,31 +1,143 @@
-/*   
+/*
   time-scaled-music-iterator.cc -- implement Time_scaled_music_iterator
-  
+
   source file of the GNU LilyPond music typesetter
+
+  (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>,
+                 Erik Sandberg <mandolaerik@gmail.com>
+*/
+
+#include "context.hh"
+#include "input.hh"
+#include "international.hh"
+#include "music.hh"
+#include "sequential-iterator.hh"
+
+/*
+  Iterates \times, by sending TupletSpanEvents at the start/end of each
+  tuplet bracket. Extra stop/start events are sent at regular
+  intervals if tupletSpannerDuration is set.
+*/
+class Time_scaled_music_iterator : public Sequential_iterator
+{
+public:
+  DECLARE_SCHEME_CALLBACK (constructor, ());
+  /* construction */
+  DECLARE_CLASSNAME(Time_scaled_music_iterator);
+  Time_scaled_music_iterator ();
+protected:
+  virtual SCM get_music_list () const;
+  virtual void process (Moment m);
+  virtual void construct_children ();
+  virtual void derived_mark () const;
+  virtual Moment pending_moment () const;
+private:
+
+  /* tupletSpannerDuration */
+  Moment spanner_duration_;
+
+  /* next time to add a stop/start pair */
+  Moment next_split_mom_;
   
-  (c) 1998--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-  
- */
+  /* Recycle start/stop events if tupletSpannerDuration is set. */
+  Music *start_;
+  Music *stop_;
+};
+
+Time_scaled_music_iterator::Time_scaled_music_iterator ()
+{
+  spanner_duration_ = next_split_mom_ = 0;
+}
+
+
+Moment
+Time_scaled_music_iterator::pending_moment () const
+{
+  Moment next_mom = Sequential_iterator::pending_moment ();
+
+  if (spanner_duration_.to_bool () &&
+      next_mom.main_part_ > next_split_mom_)
+    {
+      next_mom = next_split_mom_;
+    }
+
+  return next_mom;
+}
 
-#include "time-scaled-music-iterator.hh"
-#include "time-scaled-music.hh"
-#include "musical-request.hh"
-#include "translator-group.hh"
-#include "command-request.hh"
 
 void
 Time_scaled_music_iterator::process (Moment m)
 {
-  if (!m.to_bool ())
+  if (spanner_duration_.to_bool () &&
+      m.main_part_ == next_split_mom_)
     {
-      Music_iterator *yeah = try_music (music_l ());
-      if (yeah)
-       set_translator (yeah->report_to_l ());
-      else
-       music_l ()->origin ()->warning (_ ("no one to print a tuplet start bracket"));
+      report_event (stop_);
+      report_event (start_);
+      
+      next_split_mom_ += spanner_duration_;
+      /* avoid sending events twice at the end */
+      if (next_split_mom_ == get_music ()->get_length ().main_part_)
+       next_split_mom_.set_infinite (1);
     }
+  Sequential_iterator::process(m);
+}
+
+void
+Time_scaled_music_iterator::construct_children ()
+{
+  /*
+    Inheritance trickery:
+    Time_scaled_music_iterator::construct_children initialises start_
+    and stop_, and calls Sequential_music::construct_children, which
+    in turn calls Time_scaled_music_iterator::get_music which reads
+    start_ and stop_.
+   */
+
+  Music *mus = get_music ();
+  Input *origin = mus->origin ();
+
+  SCM tuplet_symbol = ly_symbol2scm ("TupletSpanEvent");
+  SCM start_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (START));
+  start_ = unsmob_music (start_scm);
+  start_->set_spot (*origin);
+  start_->set_property ("numerator", mus->get_property ("numerator"));
+  start_->set_property ("denominator", mus->get_property ("denominator"));
+  start_->set_property ("tweaks", mus->get_property ("tweaks"));
+  
+
+  SCM stop_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (STOP));
+  stop_ = unsmob_music (stop_scm);
+  stop_->set_spot (*origin);
+
+  Moment *mp = unsmob_moment (get_outlet ()->get_property ("tupletSpannerDuration"));
+
+  if (mp)
+    {
+      spanner_duration_ = mp->main_part_;
+      next_split_mom_ = spanner_duration_;
+    }
+
+  Sequential_iterator::construct_children ();
+}
+
+SCM
+Time_scaled_music_iterator::get_music_list () const
+{
+  Music *mus = get_music ();
+  SCM child = mus->get_property ("element");
+
+  return scm_list_3 (start_->self_scm (), child, stop_->self_scm ());
+}
+
+void
+Time_scaled_music_iterator::derived_mark () const
+{
+  if (start_)
+    scm_gc_mark (start_->self_scm ());
+  if (stop_)
+    scm_gc_mark (stop_->self_scm ());
 
-  Music_wrapper_iterator::process (m);
+  Sequential_iterator::derived_mark ();
 }
 
 IMPLEMENT_CTOR_CALLBACK (Time_scaled_music_iterator);