Issue 5167/6: Changes: show \markup xxx = ... \etc assignments

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

diff --git a/lily/melody-engraver.cc b/lily/melody-engraver.cc
index 5c9ee1c8269c892eca274f09bd43bf5aac6e0669..65f464c357e16982085603a0d86013508342159d 100644 (file)
--- a/lily/melody-engraver.cc
+++ b/lily/melody-engraver.cc
@@ -1,51 +1,119 @@
 /*
-  melody-engraver.cc -- implement Melody_engraver
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 1997--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
-*/
+  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 "engraver.hh"
 
 #include "item.hh"
 #include "melody-spanner.hh"
+#include "pointer-group-interface.hh"
 
-/**
-   Make stems upon receiving noteheads.
-*/
 class Melody_engraver : public Engraver
 {
   Grob *melody_item_;
+  Grob *stem_;
 protected:
-  
-  DECLARE_ACKNOWLEDGER (stem);
+
+  void acknowledge_stem (Grob_info);
+  void acknowledge_slur (Grob_info);
   TRANSLATOR_DECLARATIONS (Melody_engraver);
+  void stop_translation_timestep ();
+  void process_acknowledged ();
+  void process_music ();
 };
 
-
-Melody_engraver::Melody_engraver ()
+Melody_engraver::Melody_engraver (Context *c)
+  : Engraver (c)
 {
+  stem_ = 0;
   melody_item_ = 0;
 }
 
 void
-Melody_engraver::acknowledge_stem (Grob_info info)
+Melody_engraver::process_music ()
+{
+  if (scm_is_string (get_property ("whichBar")))
+    melody_item_ = 0;
+}
+
+/*
+  Used to be in stop_translation_timestep, but grobs can't
+  be created here.
+*/
+void
+Melody_engraver::process_acknowledged ()
+{
+  if (stem_
+      && !is_direction (stem_->get_property_data ("neutral-direction")))
+    {
+      extract_grob_set (stem_, "rests", rests);
+      if (rests.size ())
+        melody_item_ = 0;
+      else
+        {
+          if (!melody_item_)
+            melody_item_ = make_item ("MelodyItem", stem_->self_scm ());
+
+          Melody_spanner::add_stem (melody_item_, stem_);
+        }
+    }
+}
+
+void
+Melody_engraver::stop_translation_timestep ()
 {
-  if (!melody_item_)
-    melody_item_ = make_item ("MelodyItem", info.grob ()->self_scm ());
+  stem_ = 0;
+}
 
-  Melody_spanner::add_stem (melody_item_, info.grob ());
+void
+Melody_engraver::acknowledge_slur (Grob_info /* info */)
+{
+  melody_item_ = 0;
 }
 
+void
+Melody_engraver::acknowledge_stem (Grob_info info)
+{
+  stem_ = info.grob ();
+}
 
 #include "translator.icc"
-ADD_ACKNOWLEDGER (Melody_engraver, stem);
+
+
+void
+Melody_engraver::boot ()
+{
+  ADD_ACKNOWLEDGER (Melody_engraver, stem);
+  ADD_ACKNOWLEDGER (Melody_engraver, slur);
+}
+
 ADD_TRANSLATOR (Melody_engraver,
-               "Create information for context dependent typesetting decisions. ",
-               "MelodyItem",
-               "",
-               "",
-               "");
-               
+                /* doc */
+                "Create information for context dependent typesetting"
+                " decisions.",
+
+                /* create */
+                "MelodyItem ",
+
+                /* read */
+                "",
+
+                /* write */
+                ""
+               );
+