-Spanner *
-Ligature_engraver::create_ligature_spanner ()
-{
- programming_error ("Ligature_engraver::create_ligature_spanner (): "
- "this is an abstract method that should not be called, "
- "but overridden by a subclass");
- return 0;
-}
-
-/*
- * This method should do something that comes close to the following
- * .ly snippet:
- *
- * \property Voice.NoteHead \override #'print-function =
- * < value of #'ligature-primitive-callback of Voice.NoteHead >
- *
- * TODO: What we are doing here on the c++ level, should actually be
- * performed on the SCM level. However, I do not know how to teach
- * lilypond to apply an \override and \revert on #'print-function,
- * whenever lily encounters a \[ and \] in an .ly file, respectively.
- * Also encounter, that lily should not crash if a user erronously
- * nests \[ and \].
- */
-void
-Ligature_engraver::override_stencil_callback ()
-{
- SCM target_callback = ly_symbol2scm ("print-function");
- SCM source_callback = ly_symbol2scm ("ligature-primitive-callback");
- SCM noteHeadProperties = updated_grob_properties (context (), ly_symbol2scm ("NoteHead"));
- SCM value = ly_cdr (scm_sloppy_assq (source_callback, noteHeadProperties));
- execute_pushpop_property (context (), ly_symbol2scm ("NoteHead"),
- target_callback, value);
-}
-
-/*
- * This method should do something that comes close to the following
- * .ly snippet:
- *
- * \property Voice.NoteHead \revert #'print-function
- *
- * TODO: What we are doing here on the c++ level, should actually be
- * performed on the SCM level. However, I do not know how to teach
- * lilypond to apply an \override and \revert on #'print-function,
- * whenever lily encounters a \[ and \] in an .ly file, respectively.
- * Also encounter, that lily should not crash if a user erronously
- * nests \[ and \].
- */
-void
-Ligature_engraver::revert_stencil_callback ()
-{
- SCM symbol = ly_symbol2scm ("NoteHead");
- SCM key = ly_symbol2scm ("print-function");
- execute_pushpop_property (context (), symbol, key, SCM_UNDEFINED);
-}
-