Imported Upstream version 2.14.2

[lilypond.git] / lily / tuplet-iterator.cc

diff --git a/lily/tuplet-iterator.cc b/lily/tuplet-iterator.cc
new file mode 100644 (file)
index 0000000..97737db
--- /dev/null
+++ b/lily/tuplet-iterator.cc
@@ -0,0 +1,149 @@
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 1998--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>,
+                 Erik Sandberg <mandolaerik@gmail.com>
+
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "context.hh"
+#include "input.hh"
+#include "international.hh"
+#include "music.hh"
+#include "music-wrapper-iterator.hh"
+#include "stream-event.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 Tuplet_iterator : public Music_wrapper_iterator
+{
+public:
+  DECLARE_SCHEME_CALLBACK (constructor, ());
+  /* construction */
+  DECLARE_CLASSNAME (Tuplet_iterator);
+  Tuplet_iterator ();
+protected:
+  virtual void process (Moment m);
+  virtual void construct_children ();
+  virtual void derived_mark () const;
+  virtual Moment pending_moment () const;
+
+  Music *create_event (Direction d);
+
+private:
+
+  /* tupletSpannerDuration */
+  Moment spanner_duration_;
+
+  /* next time to add a stop/start pair */
+  Moment next_split_mom_;
+
+  /* Recycle start/stop events if tupletSpannerDuration is set. */
+  SCM synthesized_events_;
+
+  Context_handle tuplet_handler_;
+};
+
+Music *
+Tuplet_iterator::create_event (Direction d)
+{
+  SCM ev_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"),
+                          ly_symbol2scm ("TupletSpanEvent"),
+                          scm_from_int (d));
+
+  Music *mus = get_music ();
+
+  Music *ev = unsmob_music (ev_scm);
+  ev->set_spot (*mus->origin ());
+  if (d == START)
+    {
+      ev->set_property ("numerator", mus->get_property ("numerator"));
+      ev->set_property ("denominator", mus->get_property ("denominator"));
+      ev->set_property ("tweaks", mus->get_property ("tweaks"));
+      ev->set_property ("length", spanner_duration_.smobbed_copy ()); 
+    }  
+
+  synthesized_events_ = scm_cons (ev_scm, synthesized_events_);
+  return ev;
+}
+
+Tuplet_iterator::Tuplet_iterator ()
+{
+  spanner_duration_ = next_split_mom_ = 0;
+  synthesized_events_ = SCM_EOL;
+}
+
+Moment
+Tuplet_iterator::pending_moment () const
+{
+  Moment next_mom = Music_wrapper_iterator::pending_moment ();
+  next_mom = min (next_mom, next_split_mom_);
+
+  return next_mom;
+}
+
+void
+Tuplet_iterator::process (Moment m)
+{
+  if (spanner_duration_.to_bool ()
+      && m.main_part_ == next_split_mom_)
+    {
+      descend_to_bottom_context ();
+      if (tuplet_handler_.get_outlet ())
+       create_event (STOP)->send_to_context (tuplet_handler_.get_outlet ());
+
+      if (m.main_part_ < music_get_length ().main_part_)
+       {
+         tuplet_handler_.set_context (get_outlet ());
+         report_event (create_event (START));
+
+         next_split_mom_ += spanner_duration_;
+       }
+      else
+       tuplet_handler_.set_context (0);
+    }
+  Music_wrapper_iterator::process (m);
+  if (child_iter_ && child_iter_->ok ())
+    descend_to_child (child_iter_->get_outlet ());
+  
+}
+
+void
+Tuplet_iterator::construct_children ()
+{
+  spanner_duration_ = music_get_length ();
+
+  Moment *mp
+    = unsmob_moment (get_outlet ()->get_property ("tupletSpannerDuration"));
+  if (mp)
+    spanner_duration_ = min (mp->main_part_, spanner_duration_);
+
+  Music_wrapper_iterator::construct_children ();
+
+  if (child_iter_ && child_iter_->ok ())
+    descend_to_child (child_iter_->get_outlet ());
+}
+
+void
+Tuplet_iterator::derived_mark () const
+{
+  scm_gc_mark (synthesized_events_);
+  Music_wrapper_iterator::derived_mark ();
+}
+
+IMPLEMENT_CTOR_CALLBACK (Tuplet_iterator);