X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Finstrument-switch-engraver.cc;h=f0c6e6aec61515925322d8b39eb4849225213191;hb=0b544cfb7332615ef809b71b57ab656741311ae1;hp=35a670d70ee2f9ae4503789f2a762c5e17e82529;hpb=e344ae579fa1d81fc6c6f3049494697872fd39f9;p=lilypond.git

diff --git a/lily/instrument-switch-engraver.cc b/lily/instrument-switch-engraver.cc
index 35a670d70e..f0c6e6aec6 100644
--- a/lily/instrument-switch-engraver.cc
+++ b/lily/instrument-switch-engraver.cc
@@ -1,16 +1,28 @@
 /*
-  instrument-switch-engraver.cc -- implement
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 2006--2014 Han-Wen Nienhuys <hanwen@lilypond.org>
 
-  (c) 2006--2008 Han-Wen Nienhuys <hanwen@lilypond.org>
 
+  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 "translator.icc"
+#include "text-interface.hh"
 
+#include "translator.icc"
 
 class Instrument_switch_engraver : public Engraver
 {
@@ -22,8 +34,15 @@ protected:
 
   void stop_translation_time_step ();
   void process_music ();
+
+  virtual void derived_mark () const;
 };
 
+void
+Instrument_switch_engraver::derived_mark () const
+{
+  scm_gc_mark (cue_name_);
+}
 
 Instrument_switch_engraver::Instrument_switch_engraver ()
 {
@@ -38,11 +57,14 @@ void
 Instrument_switch_engraver::process_music ()
 {
   SCM cue_text = get_property ("instrumentCueName");
-  
+
   if (!scm_is_eq (cue_name_, cue_text))
     {
-      text_ = make_item ("InstrumentSwitch", SCM_EOL);
-      text_->set_property ("text", cue_text);
+      if (Text_interface::is_markup (cue_text))
+        {
+          text_ = make_item ("InstrumentSwitch", SCM_EOL);
+          text_->set_property ("text", cue_text);
+        }
       cue_name_ = cue_text;
     }
 }
@@ -54,15 +76,15 @@ Instrument_switch_engraver::stop_translation_time_step ()
 }
 
 ADD_TRANSLATOR (Instrument_switch_engraver,
-		/* doc */
-		"Create a cue text for taking instrument.",
-			
-		/* create */
-		"InstrumentSwitch ",
-
-		/* read */
-		"instrumentCueName ",
-			
-		/* write */
-		""
-		);
+                /* doc */
+                "Create a cue text for taking instrument.",
+
+                /* create */
+                "InstrumentSwitch ",
+
+                /* read */
+                "instrumentCueName ",
+
+                /* write */
+                ""
+               );