Add scheme callbacks for accessing a note column's dot-column and

accidentals, for use in a scheme engraver.

Take remarks by Neil and Joe into account.

diff --git a/lily/note-column-scheme.cc b/lily/note-column-scheme.cc
new file mode 100644 (file)
index 0000000..e8b88af
--- /dev/null
+++ b/lily/note-column-scheme.cc
@@ -0,0 +1,48 @@
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2010 Nicolas Sceaux <nicolas.sceaux@free.fr>
+
+  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 "note-column.hh"
+#include "lily-guile.hh"
+#include "grob.hh"
+
+LY_DEFINE (ly_note_column_accidentals, "ly:note-column-accidentals",
+          1, 0, 0, (SCM note_column),
+          "Return the @code{AccidentalPlacement} grob from @var{note_column}"
+          "if any, or @code{SCM_EOL} otherwise.")
+{
+  Grob *grob = unsmob_grob (note_column);
+  LY_ASSERT_SMOB (Grob, note_column, 1);
+  Grob *acc = Note_column::accidentals (grob);
+  if (acc)
+    return acc->self_scm ();
+  return SCM_EOL;
+}
+
+LY_DEFINE (ly_note_column_dot_column, "ly:note-column-dot-column",
+          1, 0, 0, (SCM note_column),
+          "Return the @code{DotColumn} grob from @var{note_column}"
+          "if any, or @code{SCM_EOL} otherwise.")
+{
+  Grob *grob = unsmob_grob (note_column);
+  LY_ASSERT_SMOB (Grob, note_column, 1);
+  Grob *dot_column = Note_column::dot_column (grob);
+  if (dot_column)
+    return dot_column->self_scm ();
+  return SCM_EOL;
+}