resolve merge

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

diff --git a/lily/partial-iterator.cc b/lily/partial-iterator.cc
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+++ b/lily/partial-iterator.cc
@@ -0,0 +1,56 @@
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2010--2011 Neil Puttock <n.puttock@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 "moment.hh"
+#include "music.hh"
+#include "simple-music-iterator.hh"
+
+class Partial_iterator : public Simple_music_iterator
+{
+public:
+  DECLARE_SCHEME_CALLBACK (constructor, ());
+ protected:
+  virtual void process (Moment);
+};
+
+void
+Partial_iterator::process (Moment m)
+{
+  if (Duration *dur
+      = unsmob_duration (get_music ()->get_property ("partial-duration")))
+    {
+      Context *ctx = get_outlet ();
+      Moment now = ctx->now_mom ();
+      if (now.main_part_ > Rational (0))
+       get_music ()->origin ()->
+         warning (_ ("trying to use \\partial after the start of a piece"));
+      Moment length = Moment (dur->get_length ());
+      now = Moment (0, now.grace_part_);
+      ctx->set_property ("measurePosition", (now - length).smobbed_copy ());
+    }
+  else
+    programming_error ("invalid duration in \\partial");
+
+  Simple_music_iterator::process (m);
+}
+
+IMPLEMENT_CTOR_CALLBACK (Partial_iterator);